292results about How to "Reduce exhaust pressure" patented technology

PCT No. PCT / JP97 / 03706 Sec. 371 Date Apr. 14, 1999 Sec. 102(e) Date Apr. 14, 1999 PCT Filed Oct. 14, 1997 PCT Pub. No. WO98 / 16696 PCT Pub. Date Apr. 23, 1998The flush toilet has a waste receipt surface section (10) of a bowl section (1) formed continuously integrally with an inner rim wall surface section (15) of the rim portion disposed at a peripheral edge of an upper opening (13) of the bowl section (1) as a curved surface; and the inner rim wall surface section (15) of the rim portion acts as a flush water passage (16) of the bowl section. The flush water passage (16) of the bowl section is further configured such that the inner rim wall surface section (15) of the rim portion is shaped in an overhanging form inclining so as to hang over inside of the bowl section (1). The flush toilet of this configuration can be cleaned with ease and kept clean in sanitation.

The invention relates to the field of heating ventilation air conditioners, in particular to an improved air treatment method and a fresh air conditioner device. The invention improves the problems of traditional fresh air treatment and air conditioners and particularly emphasizes that a plate-type air-air heat exchanger and indirect water evaporative cooling are used for recycling energy of sensible heat and latent heat in air exhaust in the fresh air treatment process of damp and hot regions in summer and condensed water is directly evaporated on an evaporator to improve the working condition of a compressor. Under the condition of quantificationally supplying outdoor fresh air, the energy efficiency ratio of the fresh air conditioner is increased, the thermal pollution, damp pollution and noise pollution of the fresh air conditioner to environments are reduced, the indoor air quality is improved, and meanwhile, the fresh air conditioner provides the manufacture, installation and using convenience for a local region all-air central air conditioner. The fresh air conditioner provided by the invention and a design and manufacture method of the fresh air conditioner are applicable throughout the year in various regions, particularly in the damp and hot regions; and the fresh air system provides controlled, comfortable and healthy air environments for indoor activity space of people and air conditioner environments for technology for processing, storage and the like.

An air conditioner which controls capacity of an outdoor heat-exchanger unit without an on-off valve that exhibits high pressure loss, which prevents accumulation of refrigerant in an outdoor heat-exchanger, and which maintains reliability of a compressor or refrigeration cycle. The air conditioner includes a first expansion valve on a liquid line of a first outdoor heat- exchanger, a second expansion valve on a liquid line of a second outdoor heat-exchanger, a first connection line to connect a suction line to one port of the first 4-way valve, the suction line connecting a suction port of the compressor and an indoor heat-exchanger unit, a second connection line to connect the suction line to one port of the second 4-way valve, and a check valve provided on the second connection line to allow flow of refrigerant only from the second 4-way valve to the suction line.

Disclosed is a turbomachine including at least one exhaust pathway along which exhaust is directed and released to ambient and at least one exhaust processor capable of removing regulated substances from the exhaust. One or more ambient air inlets are located at the at least one exhaust pathway upstream of the at least one exhaust processor. The at least one exhaust pathway is configured such that ambient air is capable of being urged into the at least one exhaust pathway through the one or more ambient air inlets by an acceleration of the exhaust along the at least one exhaust pathway. The ambient air urged into the at least one exhaust pathway reduces a temperature of the exhaust to increase effectiveness of the at least one exhaust processor. Further disclosed is a method for releasing turbomachine exhaust to ambient.

The invention provides a control method and a control device of an air-conditioner, and an air-conditioner, wherein the air-conditioner comprises a refrigeration system, an indoor fan, and an outdoor fan; the control method of the air-conditioner comprises the following steps: when an instruction of starting the air-conditioner is received, detecting an operating mode of the air-conditioner and detecting a discharge pressure of a compressor in the refrigeration system; and controlling the indoor fan and / or the outdoor fan according to the discharge pressure and the operating mode of the air-conditioner so as to control a pressure of the refrigeration system. The technical solution of the present invention is capable of immediately controlling the indoor fan and / or the outdoor fan to ensure that the system pressure is adjusted to a non-stop pressure range upon detecting abnormal discharge pressure of the compressor; in such a manner, smooth start and reliable operation of the air-conditioner system are guaranteed, and therefore, the comfort of a user using the air-conditioner is improved.

The invention discloses an indirect air cooling method and a system with the working fluid of parallel-connected obverse and inverse refrigeration cycles. Based on the phase transition in the working fluid cooling process, a double-phase transition heat exchanger and a single-phase transition heat exchanger are respectively coupled with an obverse refrigeration cycle and an inverse refrigeration cycle which are connected in parallel; the saturated gaseous refrigerant from the phase-transition heat exchangers is compressed, boosted and then sent to an air-cooled radiator for exothermic condensation, then the condensed refrigerant enters a liquid storage tank and is decompressed through a throttle valve and sent to the phase-transition heat exchangers so as to complete the obverse refrigeration cycle; or the saturated gaseous refrigerant from the phase-transition heat exchangers is throttled and decompressed through a thermal expansion valve and then sent to the air-cooled radiator and the liquid storage tank, pressurized by a booster pump and finally sent back to the phase-transition heat exchangers so as to complete the inverse refrigeration cycle. The method and the system can be widely applied to the cooling systems of the condensers in thermal power, nuclear power and other turbine-generator units or the cooling systems of the intercoolers in petroleum, chemical and other industries to reduce energy consumption, save investments, as well as improve water-saving rate and the adaptability of the cooling system to the environment; therefore, the method and the system are provided with promotional values and can produce larger social environmental benefits and economic benefits after implementation.

The invention discloses a treatment method and a treatment device for condensed water of a household air conditioner. The method comprises the following steps: when the air conditioner is used for refrigeration, the condensed water generated from an indoor unit of the air conditioner is collected, then is drained to outdoors, and is sprayed on a condenser of an outdoor unit of the air conditioner, the high temperature of the condenser of the outdoor unit of the air conditioner is utilized to evaporate the discharged condensed water and discharge the condensed water into the air, and the temperature of the condenser of the outdoor unit of the air conditioner is reduced at the same time; when the air conditioner is used for heating, the condensed water generated from the outdoor unit of the air conditioner is collected, then is conveyed indoors, and is evaporated by utilizing the high temperature generated by the pipe wall of a radiating pipe during the heating to increase the humidity of indoor air, and the temperature of the radiating pipe of the indoor unit of the air conditioner is reduced at the same time. The device can automatically recover and utilize the condensed water, thereby solving the water drain problem of the condensed water; and the device can protect the environment indoors and outdoors, save energy and reduce consumption, improve the work efficiency of the air conditioner, and can maintain the moisture of the indoor air when the air conditioner is used for heating.

A refrigerant heat pump system is operable in both heating and cooling modes. A reheat circuit is integrated into the system schematic to provide improved control over temperature and humidity and to cover a wide spectrum of sensible and latent capacity demands. In the heating mode, the reheat coil is utilized to act as a portion of the enlarged indoor heat exchanger (a condenser in this case), in order to enhance system efficiency without the capacity loss. In some cases, where the designer can choose between the efficiency and capacity augmentation, selective operation of the reheat coil may offer an additional step of capacity modulation, in the heating mode. System reliability is improved through a reduction of start / stop cycles. Although various reheat coil arrangements in relation to the indoor and outdoor heat exchangers are offered and reheat concepts are considered, the benefits of the invention are independent from and transparent to such system design features.

A gun flash hider, formed to include a first expansion chamber, a first flow divider, a plurality of first exhaust passages, an exhaust head, a second expansion chamber, a plurality of second exhaust passages and a second flow divider, whereby high-temperature high-pressure gas produced after firing a bullet undergoes two expansion decompressions and two flow diversion decompressions, through which the gas is sequentially discharged from the first exhaust passages and the second exhaust passages, thereby substantially reducing sonic boom volume, amount of flame and recoil force produced when firing the bullet, and increasing stability and shooting accuracy when using a gun.

A gun flash hider, formed to include a first expansion chamber, a first flow divider, a plurality of first exhaust passages, an exhaust head, a second expansion chamber, a plurality of second exhaust passages and a second flow divider, whereby high-temperature high-pressure gas produced after firing a bullet undergoes two expansion decompressions and two flow diversion decompressions, through which the gas is sequentially discharged from the first exhaust passages and the second exhaust passages, thereby substantially reducing sonic boom volume, amount of flame and recoil force produced when firing the bullet, and increasing stability and shooting accuracy when using a gun.

A gasifying agent supply path A from an axial flow compressor 21 which boosts pressure of a gasifying agent to a gasifying furnace 2 is branched, and a gasifying agent bypass path D having an escaping pressure adjusting valve 23 is provided. The flow quantity or pressure of the gasifying agent supplied to the gasifying furnace 2 from the gasifying agent supply path A can be adjusted according to the degree of opening of the adjusting valve 23 disposed in the gasifying agent bypass path D, whereby providing a control valve in the gasifying agent supply path A is no longer necessary. Thus, pressure loss at the gasifying agent supply path A can be suppressed, and the discharge pressure of the axial flow compressor 21 can be greatly reduced.

A system and method for maintaining an airflow path to a turbocharger system on a locomotive operating at high altitude and in a low ambient temperature environment, is provided and includes generating an ambient air stream flow into the turbocharger system to create a compressed air stream flow having a compressed air stream temperature, wherein the ambient air stream flow includes an ambient air stream flow temperature, processing the compressed air stream to create an intercooler air stream having an intercooler air stream temperature, wherein the compressed air stream temperature is greater than the intercooler air stream temperature, directing at least a portion of at least one of the compressed air stream and the intercooler air stream toward a controllable re-circulation device, wherein the controllable re-circulation device is communicated with at least one of the compressed air stream flow and the ambient air stream flow, operating the controllable re-circulation device to combine the at least a portion of at least one of the compressed air stream and the intercooler air stream with at least one of the compressed air stream flow and the ambient air stream flow to increase at least one of the compressed air stream temperature and the ambient air stream temperature to a predetermined level.

The invention discloses a method for producing pressure oxygen by air separation. The compressed air is divided into two paths: one path of the compressed air is pressurized to enter a main heat exchanger for cooling, enter an oxygen pressurizer to exchange heat with pressure liquid oxygen to be condensed into a liquid state and enter a lower tower for rectification; and the other path of the compressed air enters the main heat exchanger for cooling and is divided into two parts, and one part of the air is expanded to be fed to an upper tower for rectification. The nitrogen obtained by the lower tower enters a condensing evaporator to be condensed into two parts, namely one part of the nitrogen serving as reflux returns to the lower tower and the other part of the nitrogen is subcooled through a subcooler and divided into two paths. One path of the nitrogen serving as liquid nitrogen is led out, and the other path of the nitrogen enters the top of the upper tower. Dirty liquid air extracted from the lower tower and the obtained liquid air are subcooled through the subcooler, enter the upper tower for rectification once again and pass through the condensing evaporator so as to form liquid oxygen. The liquid oxygen which is pressurized or subjected to liquid oxygen pump pressurization enters the oxygen pressurizer to be evaporated into pressure oxygen and reheated in the main heat exchanger for output. The method for producing the pressure oxygen has the advantages of optimized flow organization, low equipment input cost, and capacity of obviously reducing the energy consumption.

The invention provides a cylinder base assembly of a piston type compressor, the piston type compressor and a refrigeration system. The cylinder base assembly comprises a cylinder body and a variablevolume switching mechanism, wherein a compression cavity and an exhaust passage are arranged on the cylinder body; the variable volume switching mechanism is arranged on the cylinder body, and the variable volume switching mechanism enables the exhaust passage to be connected with or disconnected from the compression cavity. By the adoption of the technical scheme, the problem that a single-cylinder piston type compressor in the prior art cannot change the volume can be solved.

The invention discloses a system for improving the low-temperature heat source power generation capacity by using an injection pump. In order to increase the operating differential pressure between aturbine and an air cooler, an injection pump is connected in series between the turbine and the air cooler; a steam generator is additionally connected in series behind a first-level steam generator;a water side of the first-level steam generator is connected in series with a water side of a second-level steam generator; a working medium side of the first-level steam generator is connected in series with the turbine, the injection pump, the air cooler and a first working medium pump to form a closed loop; and a working medium side of the second-level steam generator is connected in series with the injection pump, the air cooler and a second working medium pump to form another closed loop. The invention reduces the backpressure of the turbine, increases the operating differential pressureand enhances the working ability. The low-temperature heat source performs secondary heat release in the second-level steam generator, and the steam after heat exchange is used as the working steam ofthe injection pump, thereby realizing the graded use of energy and improving the energy use ratio.

The invention discloses an air conditioner and a control method thereof. The air conditioner comprises a compressor, a reversing assembly, an outdoor heat exchanger, a throttling device, a first indoor heat exchanger, a second indoor heat exchanger, a first control valve and a second control valve, wherein the first indoor heat exchanger and the second indoor heat exchanger are arranged in the same indoor unit and connected in parallel; when the air conditioner is in a refrigeration mode and using of the second indoor heat exchanger needs to be stopped, the first control valve is closed, and the second control valve is in the state of blocking coolants from flowing towards the second indoor heat exchanger after a set period of time; and when the air conditioner is in a heating mode and using of the second indoor heat exchanger needs to be stopped, the heating mode is switched to be the refrigeration mode, then, the first control valve is closed, the refrigeration mode is switched to be the heating mode after a set period of time, and the second control valve is in the state of blocking the coolants from flowing towards the second indoor heat exchanger. According to the air conditioner provided by the invention, the problem that the heat exchange area of an indoor heat exchanger is too large can be solved, and the problem that the coolants are accumulated in a part of shielded indoor heat exchangers in the correlation technique is also solved.

The present invention provides a method and apparatus for supplying process liquid s for a machine tool, which are able to reduce the consumption power and power factor of the pump 21 to a large extent in comparison with prior arts while maintaining the effects of process liquid s according to prior arts. The invention is embodied so that process liquid s such as coolant or cleaning fluid is supplied to necessary points by causing the process liquid s to flow down, which is stored in a sub tank 20 installed at a suitable height in a machine tool, by a gravity action when intermittently supplying the process liquid s such as coolant or cleaning fluid to the necessary points such as a workrest 2 and a workpiece w fixed thereon; the supplied process liquid s is collected into a main tank 19 on the other hand; and the process liquid s stored in the main tank 19 is transferred into the sub tank 20 by the pump 21.

The invention relates to a trans-critical CO2 heat pump water heater pressure control method and system. The method comprises the steps of collecting the outlet temperature tgc of an air cooling device, an evaporation temperature te of an evaporator, a discharge pressure P of a compressor, and a water outlet temperature Tw1 of a water tank; calculating the optimal discharge pressure Popt according to tgc and te; judging whether the difference between P and Popt is within an permissible range and maintaining the current operation state if the difference is within the permissible range and performing the step S4 if the difference is not within the permissible range; by judging the difference between Tw1 and the preset water outlet temperature Tw0 and an evaporator fan rotating speed V, adjusting the water inlet flow of the air cooling device, the evaporator fan rotating speed and the electronic expansion valve opening degree according to a preferential order until the difference between P and Popt is within the permissible range. Through the preferential adjustment order, the difference between P and Popt is within the permissible range and the performance coefficient (COP) of the system reaches the maximum, so that the system stability is improved, the service life of the electronic valve is prolonged and the system reliability is improved.

The invention discloses a heating system modifying method for realizing combination of heat and power by a straight condensing unit. The heat system modifying method is characterized by comprising two implementation manners, consisting of an intermediate exhaust steam extraction manner and a high exhaust steam extraction manner, wherein the implementation manners comprise the following steps of: (1) the intermediate exhaust steam extraction manner: perforating a communication pipe of a turbine for communicating an intermediate-pressure cylinder with a low-pressure cylinder so as to be connected with a heating steam extraction pipe, and arranging a heating steam extraction pipe network to be connected to heat-supplied users; and (2) the high exhaust steam extraction manner: perforating a cold-section pipe in the front of an inlet of a reheater so as to be connected with the heating steam extraction pipe, or perforating a hot-section pipe at the back of an outlet of the reheater so as to be connected with the heating steam extraction pipe by taking exhausted steam of a high-pressure cylinder of the turbine as a heating source, and arranging a heating steam extraction network to be connected to the heat-supplied users, wherein the heating steam extraction pipe is provided with a steam extraction pressure regulating valve, a safety valve and a check valve. The invention provides a method for modifying a generator unit to be a heat and power combined device; and heat is supplied for the users by utilizing steam of a turboset and the advantages of environment friendliness, energy conservation and good economic benefits are achieved.

A crankshaft of an internal combustion engine has journals provided with shaft oil passages for carrying the oil to crankpins, and guide grooves having parts in which the shaft oil passages open, respectively, and opening in the cylindrical surfaces of the journals, respectively. The guide grooves has downstream end parts into which the shaft oil passages open, respectively, and extend in a circumferential direction in which the crankshaft rotates from the downstream end parts, respectively. First half bearing members of bearings are provided in their bearing surfaces with oil grooves through which the oil is supplied to the guide grooves, respectively. Each of the oil grooves are diametrically opposite to each of the guide grooves. The oil grooves have an axial width (W5) smaller than the axial width (W3) of the guide grooves. Thus oil leakage from gaps between each of the bearings and each of the journals of the crankshaft is reduced and hence an oil pump having a small capacity can be used.

The improvement system of energy efficiency for the refrigeration cycle is comprised of: an auxiliary heat exchanger unit for heat-exchanging between refrigerant liquid having high pressure and refrigerant vapor having low pressure; and a cabinet which houses a pressure support value placed at an inlet of an inner pipe of the auxiliary heat exchanger unit, and a pressure of the refrigerant liquid having high pressure condensed at the outdoor heat exchanger is decreased by the pressure support value, and a condensed pressure of the outdoor heat exchanger is maintained. The system can be used to accompany with the ordinary air cooler and heat pump etc., and a conventional refrigerator can be utilized for both heating and cooling like the heat pump, thus leading to an increase of coefficient of performance and a decrease of consumption of electric power.

The invention discloses a measure for improving a supercritical or ultra supercritical coal-burning power generation thermal system belonging to the thermal power generation technical field, relating to the supercritical or ultra supercritical coal-burning power generation thermal system without an economizer and a parameter configuration. The invention concretely comprises following steps of removing the economizer which is requisite for a conventional boiler to simplify the flow of a boiler and reduce the flow resistance of a system and the station service power consumption rate; increasing a primary high-voltage bleeder heater to increase the feed temperature; possibly reducing the exhaust steam pressure and the temperature of a high pressure cylinder to enable the exhaust steam temperature of the high pressure cylinder to be equal or similar to the feed temperature; possibly increasing the temperature of reheat steam on the premise of guarantee of safety; and increasing or providing an air preheater and increasing the temperature of secondary wind to improve the average temperature of heat release of flue gas of the boiler to the cycle fluid of power generation and improve the second-law efficiency of the boiler and the combustion stability of unit coal species changing.

The invention discloses an energy-saving cooling method and an energy-saving cooling system for reducing exhaust steam pressure of an air-cooled unit in a power plant, which are used for solving the problem that power output of the air-cooled unit is blocked in summer. According to the method, the exhaust steam pressure of the air-cooled unit is reduced by setting refrigerating equipment and adopting the following measures: (a), the working solution of a water-ring vacuum pump is cooled by chilled water prepared by the refrigerating circulating equipment through a cooler, and the temperature of the working solution is reduced to a set value; (b), the industrial desalted water is cooled by the chilled water prepared by the refrigerating circulating equipment through the cooler, one part ofthe cooled industrial desalted water is used for evaporative cooling of the outlet air of an axial flow fan of the air-cooled unit through a nozzle, and the other part of the cooled industrial desalted water enters a steam turbine exhaust pipeline; and (c), the condensed water is divided into two parts through a condensed water pump, wherein one part of the condensed water enters a steam turbine heat regenerator and is delivered to a boiler, and the other part of the condensed water is cooled by the chilled water prepared by the refrigerating circulating equipment through the cooler, enters the steam turbine exhaust pipeline and is mixed with the exhaust steam to absorb latent heat of vaporization. By the improvement, the exhaust steam pressure of the air-cooled unit in the power plant can be effectively reduced, and safe and economic operation of the unit in summer is ensured.

The invention belongs to the technical field of air separation and particularly relates to a process for making nitrogen by air separation or making nitrogen and simultaneously producing oxygen in an attached manner. The process comprises the following steps of: cooling purified air and introducing into a distillation system, wherein the distillation system at least is a secondary distillation system composed of an upper distillation tower and a lower distillation tower connected into a whole by a condensate evaporator; dividing the purified air into two paths, wherein one path is to introduce the purified air into an expander for expansion refrigeration and introducing expanded air into the middle part of the upper distillation tower, and the other path is to introduce the purified air into the lower distillation tower for distillation after the purified air is cooled to the saturation temperature; and finally obtaining a nitrogen product at the top part of the upper distillation tower. The process has the beneficial effects that an air compressor is low in exhaust pressure and low in energy consumption, so that the energy consumption requirements of a nitrogen production device by air separation are greatly reduced; the current requirements of energy conservation and emission reduction in China on high energy consuming industries are satisfied; and meanwhile, the extraction rate of the nitrogen can be up to 85-97%, and the energy consumption is 0.1-0.18 kWh / Nm3N2.

The invention discloses an air conditioner outdoor unit, an air conditioning unit and a refrigeration control method and a heating control method thereof. The air conditioner outdoor unit comprises an outdoor unit shell and a wind valve, wherein the wind valve covers an intake port of the outdoor unit shell. The air conditioner outdoor unit is provided with the wind valve for covering the intake port of the outdoor unit shell, so that the intake quantity of the outdoor unit shell can be adjusted through the wind valve, that is, the heat exchange quantity of an outdoor heat exchanger with external environment can be adjusted; and in particular, in low-temperature refrigeration and high-temperature heating of the air conditioning unit, the heat exchange quantity of the outdoor heat exchanger with the external environment is reduced, so that the low-temperature refrigeration operation stability and the high-temperature heating operation stability of the air conditioning unit are improved, and the service life of a compressor can be prolonged.

The invention discloses a controlling method for an air conditioning system. The controlling method for the air conditioning system comprises the following steps that a gas discharging temperature of a compressor of the air conditioning system is acquired; when the gas discharging temperature is greater than a first preset temperature, an electronic expansion valve of the air conditioning system is controlled to open a first reserved opening degree, so that gaseous low temperature refrigerant after gas-liquid separation in a flash evaporator of the air conditioning system and the gas in a gas discharging outlet of the compressor are confluent, and gas discharging pressure and the gas discharging temperature are reduced accordingly; when the gas discharging temperature reaching a second preset temperature is monitored, an opening degree of the electronic expansion valve is turned down or the electronic expansion valve is closed, so that gas confluence between the gas after the gas-liquid separation in the flash evaporator of the air conditioning system and the gas in the gas discharging outlet is reduced, or the gas confluence between the gas after the gas-liquid separation in the flash evaporator of the air conditioning system and the gas in the gas discharging outlet is cut off. The invention further provides the air conditioning system and a computer readable storage medium. According to the air conditioning system, the controlling method and the computer readable storage medium, the excessive gas discharging temperature of the compressor of the air conditioning system is prevented through an intermittent control, so that stability of the air conditioning system is improved.

The invention discloses a power station air cooling system adopting combined refrigeration with shaft seal steam leakage of a steam turbine and continuous blow-down waste heat of a boiler. The system is characterized in that the steam turbine is communicated with a steam source, the steam turbine is connected with an electric generator, and the steam turbine is sequentially communicated with an air-cooling condenser, a condensate pump and boiler feedwater; the steam turbine is sequentially communicated with a steam leakage condenser, a steam leakage condensate pump and the boiler feedwater; boiler blow-down water is sequentially communicated with a flash tank, a deaerator, a working medium superheater and a drainage ditch; the steam leakage condenser is sequentially communicated with the working medium superheater, and a generator is communicated with the steam leakage condenser through a working medium circulating pump; the generator is sequentially communicated with a condenser, a first throttling valve and an evaporator, the evaporator is communicated with an absorber, and the generator is sequentially communicated with a second throttling valve, the absorber, a solution pump and a generator; and air is sequentially communicated with the evaporator, an induced draft fan and the air-cooling condenser. A method for predicting a heat-transfer coefficient of the air-cooling condenser is further provided.

A Y-pipe splitter for use on race cars, such as stock cars which race on oval tracks and sports cars which race on road course tracks, mounts to the lower frame or chassis of the car, and routes exhaust gasses from a Y-pipe assembly to a pair of tail pipes extending to the side of the car while providing improved ground clearance. The Y-pipe splitter includes first and second splitter tail pipe sections of a generally flattened oval cross-section with a longitudinally beveled inlet portions connectable to an outlet of the Y-pipe assembly and an outlet portion connectable to one of the tail pipes. The beveled inlet portions of the splitter tail pipe sections are affixed together along a respective edge of each thereof so as to merge together with respective centerlines thereof at an oblique angle to a single inlet opening which is connectable to the outlet opening of the Y-pipe assembly by affixing thereto.