CN215571384U - Bypass noise reduction unit - Google Patents

Abstract

The utility model discloses a bypass noise reduction unit which comprises a compressor and a buffering and expanding device, wherein the buffering and expanding device is provided with a medium inlet, a bypass air inlet and a medium outlet connected with the air inlet of the compressor, and a bypass pipeline is arranged between an air outlet of the compressor and the bypass air inlet. The bypass noise reduction unit provided by the utility model can reduce the disturbance to the air flow in the air suction pipe connected to the air inlet of the compressor and reduce the noise of the bypass air flow.

Description

Bypass noise reduction unit

Technical Field

The utility model relates to the field of air conditioners, in particular to a bypass noise reduction unit.

Background

In recent years, magnetic suspension air-conditioning products are more and more applied and limited by the limitation of small pressure ratio range of a magnetic suspension centrifugal compressor, so that the magnetic suspension compressor can only be applied to single-cold products, and the application of a heat pump has great limitation and is reflected in that: when the heating working condition is started, the low-voltage too low or the pressure ratio too high starting failure is easily triggered; when the heating working condition is operated, the pressure ratio is large, the capacity unloading range of the magnetic suspension compressor is small, frequent starting and stopping can occur, so that the water temperature fluctuation is large, the use comfort is influenced, and the service life of the compressor is shortened; at shutdown, the compressor may be damaged by hitting the bearings due to the high rotational speed of the compressor. In order to solve the problems, the air-cooled magnetic levitation units generally need to be provided with an air suction and exhaust bypass device for reducing the system pressure ratio, and the air-cooled magnetic levitation units are used for starting and stopping protection and capacity unloading of the compressor. It is conventional to bypass the compressor discharge directly to the suction duct, but this creates a large flow noise, which contributes to noise pollution.

How to reduce the noise of the air conditioning unit bypass device becomes a technical problem to be solved by the technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a bypass noise reduction unit which can reduce airflow disturbance in a compressor suction pipe and bypass airflow noise.

In order to achieve the above object, the present invention provides a bypass noise reduction unit, which includes a compressor and a buffer expansion device, wherein the buffer expansion device is provided with a medium inlet, a bypass air inlet, and a medium outlet connected to the air inlet of the compressor, and a bypass pipeline is disposed between the air outlet of the compressor and the bypass air inlet.

Optionally, the bypass conduit is provided with a bypass valve.

Optionally, the bypass pipes are arranged in parallel in multiple groups.

Optionally, the buffer flash tank further comprises a four-way reversing valve, a condenser, an evaporator and a throttle valve, the buffer flash tank is a gas-liquid separator, and the medium inlet is connected with the four-way reversing valve.

Optionally, the compressor is a magnetic levitation compressor.

Optionally, the compressor is the enhanced vapor injection compressor, the evaporimeter with be equipped with reservoir and economic ware between the condenser, the gas vent of assisting of economic ware is connected to the tonifying qi mouth of enhanced vapor injection compressor.

Optionally, the ratio of the cross-sectional area of a suction pipe connected to the air inlet of the compressor to the cross-sectional area of the bypass pipe is 2-4.

Optionally, the ratio of the cross-sectional areas of the gas-liquid separator and the bypass pipeline is 60-80.

Compared with the prior art, the bypass noise reduction unit provided by the utility model reduces the pressure ratio of the system by arranging the bypass pipeline between the air outlet and the air inlet of the compressor as an air suction bypass, and meanwhile, the bypass pipeline is provided with the buffer capacity expansion device, so that part of air flow at the air outlet of the compressor passes through the bypass pipeline to the buffer capacity expansion device, the other part of air flow enters the buffer capacity expansion device through the medium inlet after circulating, and the flow rates of the bypass air flow and the main air flow are reduced due to capacity expansion, thereby reducing the noise caused by the disturbance of the main air flow by the bypass air flow.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic noise reduction diagram of a bypass noise reduction unit according to an embodiment of the present invention;

FIG. 2 is a system diagram of a bypass noise reduction unit according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a buffer expansion device;

FIG. 4 is a graph of the noise reduction effect of the bypass duct;

fig. 5 is a noise reduction effect diagram of the buffer capacity expansion device.

Wherein:

1-a compressor, 2-a condenser, 3-an evaporator, 4-a throttle valve, 5-a liquid storage device, 6-a gas-liquid separator, 7-a four-way reversing valve, 8-an economizer, 9-a bypass valve and 10-a bypass pipeline; 61-medium inlet, 62-medium outlet, 63-bypass air inlet.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order that those skilled in the art will better understand the disclosure, the utility model will be described in further detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 5, fig. 1 is a schematic noise reduction diagram of a bypass noise reduction unit according to an embodiment of the present invention, fig. 2 is a system diagram of a bypass noise reduction unit according to an embodiment of the present invention, fig. 3 is a schematic structural diagram of a buffer expansion device, fig. 4 is a noise reduction effect diagram of a bypass pipeline, and fig. 5 is a noise reduction effect diagram of a buffer expansion device.

The bypass noise reduction unit comprises a compressor 1 and a buffer capacity expansion device, wherein the pressure ratio of a bypass reduction system is configured between an exhaust port of the compressor 1 and a bypass air inlet 63 of the buffer capacity expansion device, the buffer capacity expansion device is arranged on a bypass pipeline 10, so that part of air flow at the exhaust port of the compressor 1 passes through the bypass pipeline 10 to the buffer capacity expansion device for capacity expansion and speed reduction, the other part of air flow enters the buffer capacity expansion device for capacity expansion and speed reduction through a medium inlet 61 after circulating, and the flow rates of the bypass air flow and the main air flow are reduced due to expansion, so that the noise caused by the disturbance of the bypass air flow to the main air flow is reduced.

As shown in fig. 1 and fig. 3, the compressor 1 is provided with an exhaust port and an air inlet/air inlet, the buffer capacity expansion device is provided with a medium inlet 61, a medium outlet 62 and a bypass air inlet 63, a small part of exhaust gas of the compressor 1 flows to the buffer capacity expansion device through the bypass pipeline 10 and the bypass air inlet 63 to be expanded and decelerated by airflow, and a large part of exhaust gas of the compressor 1 enters the buffer capacity expansion device after refrigeration/heating circulation, and is also expanded and decelerated by airflow, so that disturbance of the airflow of the bypass pipeline 10 to the main airflow sucked by the compressor 1 is reduced, and airflow noise is reduced.

Optionally, the bypass pipeline 10 is provided with a bypass valve 9, and when the unit is only used in the refrigeration mode and the requirement on the pressure ratio of the compressor 1 is not high, the bypass valve 9 can be closed to block the bypass pipeline 10.

In an embodiment provided by the present invention, the bypass noise reduction unit is applied to a cooling and heating air conditioning system, and the operation principle of the whole system is shown in fig. 2 and fig. 3. The bypass noise reduction unit comprises a compressor 1, a condenser 2, an evaporator 3, a throttle valve 4, a buffering expansion device and a four-way reversing valve 7, wherein four interfaces of the four-way reversing valve 7 are respectively connected with the condenser 2, the evaporator 3, an exhaust port of the compressor 1 and a medium inlet 61 of the buffering expansion device, the throttle valve 4 is arranged between the condenser 2 and the evaporator 3, the buffering expansion device serves as a gas-liquid separator, and the compressor 1 preferably adopts a magnetic suspension compressor.

In the refrigeration mode, the main circuit circulation path is as follows: the compressor 1 conveys compressed high-temperature and high-pressure gas to a four-way reversing valve 7, the compressed high-temperature and high-pressure gas is conveyed to a condenser 2 through the four-way reversing valve 7 to be condensed and released, a liquid refrigerant is conveyed to a throttle valve 4 by the condenser 2 to be decompressed and then enters an evaporator 3 to be evaporated and absorb heat, and a gaseous refrigerant flowing out of the evaporator 3 enters a gas-liquid separator through the four-way reversing valve 7 and a medium inlet 61; the auxiliary road circulation way is as follows: a small part of exhaust gas of the compressor 1 is transmitted to a gas-liquid separator through a bypass pipeline 10, and the exhaust gas is mixed with a main path low-pressure refrigerant to improve the suction pressure of the compressor 1, reduce the pressure ratio of the compressor 1 and ensure the stable operation of the system.

In the heating mode, the main path circulation path is as follows: the compressor 1 conveys compressed high-temperature and high-pressure gaseous refrigerant to the four-way reversing valve 7, conveys the compressed high-temperature and high-pressure gaseous refrigerant to the evaporator 3 through the four-way reversing valve 7, condenses and releases heat at the evaporator 3, conveys the liquid refrigerant to the condenser 2 to absorb heat and evaporate after flowing through the throttle valve 4 and reducing pressure, and finally returns to the gas-liquid separator 6 through the four-way reversing valve 7 and the medium inlet 61; the auxiliary road circulation way is as follows: a small part of exhaust gas of the compressor 1 is transmitted to the gas-liquid separator 6 through the bypass pipeline 10, and the exhaust gas is mixed with a main path low-pressure refrigerant to improve the suction pressure of the compressor 1, reduce the pressure ratio of the compressor 1 and ensure the stable operation of the system.

Further, the bypass noise reduction unit further comprises an accumulator 5 arranged between the condenser 2 and the evaporator 3. Still connect economic ware 8 on the outlet pipe way of reservoir 5, compressor 1 adopts the air injection enthalpy increasing compressor, economic ware 8 is binary channels heat exchanger substantially, including main road channel and the auxiliary road channel that only carries out heat exchange, main road channel concatenates with reservoir 5, the gas outlet of main road channel is drawn forth the air inlet of auxiliary road pipe connection to the auxiliary road channel, further gasify the heat absorption after the auxiliary road channel throttle step-down, improve the super-cooled degree of the refrigerant of 8 main road channels flow direction evaporimeters 3/condenser 2 by economic ware, improve unit efficiency, the gas outlet of auxiliary road channel is connected to compressor 1's tonifying qi mouth.

Obviously, the bypass noise reduction unit of the present application is not limited to the one shown in fig. 2, and the air conditioning unit to which the noise reduction arrangement shown in fig. 1 is applied falls within the scope of the present application. The number of the bypass pipelines 10 is not limited to one, and a plurality of bypass air inlets 63 can be arranged according to the requirement of bypass exhaust, and the number of the bypass air inlets 63 of the buffer expansion device is matched with the number of the bypass pipelines 10. The exhaust of the compressor 1 is branched by a plurality of bypass pipelines 10, so that the speed of bypass airflow and the disturbance to the airflow of the extraction pipe are further reduced. The bypass pipeline 10 can be connected with the gas-liquid separator 6, so that the gas-liquid separator 6 is used as a buffer expansion device; the bypass pipeline 10 may also be connected to the condenser 2 or the evaporator 3 as required, and the condenser 2 or the evaporator 3 serves as a buffering capacity expansion device to reduce noise, where the medium inlet 61 is a refrigerant inlet of the condenser 2 or the evaporator 3, and the refrigerant is usually in a gas-liquid mixed state.

This application is through the area of admitting air of increase bypass pipeline 10, makes the gaseous volume expansion of bypass, and the velocity of flow reduces, and airflow noise descends. To some units that do not design vapour and liquid separator 6, can draw reference to this application equally, make partial high pressure gaseous refrigerant that follow compressor 1 gas vent discharge get into and flow back to the low pressure gaseous refrigerant of compressor 1 air inlet get into the great container of diameter when converging in, reduce the air current noise that the air current disturbance arouses.

This is because the bypass duct 10 has a high flow rate of the air flow and a high flow rate of the air suction pipe line, and the bypass air flow has a large disturbance to the air flow in the air suction pipe after entering the air suction pipe, which may generate a large air flow noise. If the bypass airflow enters the gas-liquid separator 6, the flow velocity in the gas-liquid separator 6 is small, so that great disturbance and great noise are not generated.

In addition, the gas-liquid separator 6 also has the function similar to a reactive muffler, and the expansion is smaller if the pipe diameter of the bypass pipeline 10 is directly led into the air suction pipe; after the gas-liquid separator 6 is fed, the expansion ratio is large and the silencing frequency is proper, so that the silencing effect is much better than that of directly feeding the gas suction pipe, and the silencing and noise reducing effects are analyzed as shown in fig. 4 and 5.

Assuming that the bypass pipe 10 has a pipe diameter of D1 and the suction pipe has a pipe diameter of D2, it should be noted that the suction pipe is a pipe connecting the air inlets of the compressor 1. The cross section of the gas-liquid separator 6 is a, and the gas-liquid separator is directly introduced with an expansion ratio of an air suction pipe S1 (D2D 2)/(D1D 1); the expansion ratio S2 is (4A)/(pi D1D 1) by passing through the gas-liquid separator 6. S1 generally takes a value of 2-4, and S2 generally takes a value of 60-80. When the measured data S1 is 3.2, the noise reduction effect is shown in fig. 4; when S2 is 79, the noise reduction effect is shown in fig. 5. An excessively large expansion ratio causes a shift in peak noise cancellation frequency toward low-frequency noise reduction, and since most of the noise of the intake/exhaust bypass is high-frequency noise, the diameter of the gas-liquid separator 6 should not be excessively large.

It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.

The bypass noise reduction unit provided by the utility model is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (8)

1. The utility model provides a bypass noise reduction unit, its characterized in that includes compressor and buffering dilatation device, buffering dilatation device be equipped with medium entry, bypass air inlet and with the medium export that the air inlet of compressor is connected, the gas vent of compressor with set up bypass pipeline between the bypass air inlet.

2. The bypass noise reduction assembly according to claim 1, wherein the bypass duct is provided with a bypass valve.

3. The bypass noise reduction assembly according to claim 1, wherein the bypass ducts are arranged in parallel in multiple groups.

4. The bypass noise reduction unit according to any one of claims 1 to 3, further comprising a four-way reversing valve, a condenser, an evaporator and a throttle valve, wherein the buffer expansion device is a gas-liquid separator, and the medium inlet is connected to the four-way reversing valve.

5. The bypass noise reduction assembly according to claim 4, wherein the compressor is a magnetic levitation compressor.

6. The bypass noise reduction unit according to claim 4, wherein the compressor is an enhanced vapor injection compressor, a liquid storage device and an economizer are arranged between the evaporator and the condenser, and an auxiliary air outlet of the economizer is connected to an air supplement port of the enhanced vapor injection compressor.

7. The bypass noise reduction unit according to claim 6, wherein a ratio of a cross-sectional area of a suction pipe connected to an air inlet of the compressor to a cross-sectional area of the bypass duct is 2 to 4.

8. The bypass noise reduction unit according to claim 7, wherein the ratio of the cross-sectional areas of the gas-liquid separator and the bypass pipeline is 60-80.

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