CN213020431U

CN213020431U - Refrigerant circulating system

Info

Publication number: CN213020431U
Application number: CN202021773092.4U
Authority: CN
Inventors: 朱伟
Original assignee: Mitsubishi Electric Guangzhou Compressor Co Ltd
Current assignee: Mitsubishi Electric Guangzhou Compressor Co Ltd
Priority date: 2020-08-21
Filing date: 2020-08-21
Publication date: 2021-04-20
Anticipated expiration: 2030-08-21

Abstract

The utility model relates to an air conditioner technical field discloses a refrigerant circulation system, and it includes: a compressor; an outdoor heat exchanger having one end connected to an exhaust port of the compressor through a first pipe; one end of the throttling device is connected to the other end of the outdoor heat exchanger; one end of the indoor heat exchanger is connected to the other end of the throttling device, and the other end of the indoor heat exchanger is connected to an air suction port of the compressor through a second pipeline; the first pipeline is provided with a first fulcrum, the second pipeline is provided with a second fulcrum, a first bypass pipe is connected between the first fulcrum and the second fulcrum, and a first check valve which only allows the refrigerant to flow from the second fulcrum to the first fulcrum is connected to the first bypass pipe in series. The utility model has the advantages that: the reverse pressure can be prevented from occurring when the system is stopped or just started, and the damage to the compressor is avoided.

Description

Refrigerant circulating system

Technical Field

The utility model relates to an air conditioner technical field especially relates to a refrigerant circulation system.

Background

In a refrigerant circulating system, adverse effects on a compressor may be caused by the occurrence of back pressure in the system, and the occurrence of back pressure in the system mainly comprises the following reasons: 1. when the system is stopped, the refrigerant or nitrogen is filled from the low-pressure side to cause counter pressure; 2. when the system is just started, a large amount of refrigerant flows into the compressor to cause counter pressure; 3. the temperature of the low-pressure side of the system is relatively high (for example, the temperature of the environment side is too low and the temperature of the indoor side is too high in the heating process) so as to cause counter pressure; 4. during transportation or other conditions, the refrigerant on the high-pressure side of the system leaks suddenly and in large quantity, so that counter pressure is caused.

SUMMERY OF THE UTILITY MODEL

An object of the present application is to provide a refrigerant circulation system capable of preventing back pressure from occurring when the system is stopped or just started.

The purpose of the application is realized by the following technical scheme:

a refrigerant circulation system, comprising:

a compressor;

an outdoor heat exchanger having one end connected to an exhaust port of the compressor through a first pipe;

one end of the throttling device is connected to the other end of the outdoor heat exchanger; and

one end of the indoor heat exchanger is connected to the other end of the throttling device, and the other end of the indoor heat exchanger is connected to an air suction port of the compressor through a second pipeline;

the first pipeline is provided with a first fulcrum, the second pipeline is provided with a second fulcrum, a first bypass pipe is connected between the first fulcrum and the second fulcrum, and a first check valve which only allows the refrigerant to flow from the second fulcrum to the first fulcrum is connected to the first bypass pipe in series.

In the refrigerant circulation system, optionally, a second bypass pipe is further connected between the first pipe and the second pipe, and the second bypass pipe is connected in series with an electromagnetic valve.

In the above refrigerant circulation system, optionally, the refrigerant circulation system further includes:

and the oil-gas separator is connected in series on the first pipeline and is positioned between the compressor and the first fulcrum, and an oil return port of the oil-gas separator is connected to the second pipeline through a third pipeline.

In the refrigerant circulation system, optionally, an oil return capillary tube is connected in series to the third pipeline.

In the refrigerant circulation system, optionally, a second check valve that allows only the refrigerant to flow from the discharge port of the compressor to the outdoor heat exchanger is further connected in series to the first pipe.

In the refrigerant circulation system, optionally, the second check valve is disposed between the first branch point and the outdoor heat exchanger.

In the above refrigerant circulation system, optionally, the second pipeline is further connected in series with a gas-liquid separator, and the second fulcrum is located between the gas-liquid separator and the compressor.

In the refrigerant circulation system, optionally, a liquid storage tank is further connected in series to a pipeline connecting the throttling device and the outdoor heat exchanger.

In the above refrigerant circulation system, optionally, the throttle device is a throttle valve.

In the above refrigerant circulation system, optionally, a pressure sensor is respectively disposed at the air suction port and the air exhaust port of the compressor.

The utility model provides a refrigerant circulation system, through be connected with first bypass pipeline between the suction port side at the compressor and exhaust port side thereof, it has first check valve to concatenate on this first bypass pipeline, this first check valve only allows the refrigerant to flow from suction side exhaust side, can ensure when the suction side appears a large amount of refrigerants or high pressure in the twinkling of an eye, realize automatically through this first check valve, quick voltage-sharing, the automatic voltage-sharing before specially adapted system shut down or start, can prevent that the system from producing the backpressure, and then avoid causing the damage to the compressor. .

Drawings

The present application is described in further detail below in connection with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of explaining the preferred embodiments, and therefore should not be taken as limiting the scope of the present application. Furthermore, unless specifically stated otherwise, the drawings are intended to be conceptual in nature or configuration of the described objects and may contain exaggerated displays and are not necessarily drawn to scale.

Fig. 1 is a schematic view of an embodiment of a refrigerant circulation system according to the present application.

In the figure, 1, a compressor; 11. an air suction port; 12. an exhaust port; 2. an outdoor heat exchanger; 3. a throttling device; 4. an indoor heat exchanger; 5. a first conduit; 51. a first fulcrum; 6. a second conduit; 61. a second fulcrum; 7. a first bypass pipe; 8. a first check valve; 9. a second bypass pipe; 10. an electromagnetic valve; 20. a second one-way valve; 30. an oil-gas separator; 40. a third pipeline; 50. an oil return capillary tube; 60. a gas-liquid separator; 70. a liquid storage tank; 80. a pressure sensor.

Detailed Description

Hereinafter, preferred embodiments of the present application will be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that the descriptions are illustrative only, exemplary, and should not be construed as limiting the scope of the application.

First, it should be noted that the orientations of top, bottom, upward, downward, and the like referred to herein are defined with respect to the orientation in the respective drawings, are relative concepts, and thus can be changed according to different positions and different practical states in which they are located. These and other orientations, therefore, should not be used in a limiting sense.

It should be noted that the term "comprising" does not exclude other elements or steps and the "a" or "an" does not exclude a plurality.

Furthermore, it should be further noted that any single technical feature described or implied in the embodiments herein, or any single technical feature shown or implied in the figures, can still be combined between these technical features (or their equivalents) to obtain other embodiments of the present application not directly mentioned herein.

It will be further understood that the terms "first," "second," and the like, are used herein to describe various information and should not be limited to these terms, which are used merely to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present application.

It should be noted that in different drawings, the same reference numerals indicate the same or substantially the same components.

As shown in fig. 1, an embodiment of the present invention provides a refrigerant circulation system, which includes: the air conditioner comprises a compressor 1, an outdoor heat exchanger 2, a throttling device 3 and an indoor heat exchanger 4, wherein the compressor 1 is provided with an air suction port 11 and an air exhaust port 12; one end of the outdoor heat exchanger 2 is connected to the exhaust port 12 of the compressor 1 through the first pipe 5, one end of the throttling device 3 is connected to the other end of the outdoor heat exchanger, one end of the indoor heat exchanger 4 is connected to the other end of the throttling device 3, and the other end of the indoor heat exchanger is connected to the suction port 11 of the compressor 1 through the second pipe 6. The first pipe 5 is provided with a first fulcrum 51, the second pipe 6 is provided with a second fulcrum 61, a first bypass pipe 7 is connected between the first fulcrum 51 and the second fulcrum 61, and the first bypass pipe 7 is connected in series with a first check valve 8 which only allows the refrigerant to flow from the second fulcrum 61 to the first fulcrum 51.

Based on above-mentioned technical scheme, there is first check valve 7 through the side intercommunication of breathing in and the exhaust side at compressor 1, it has first check valve 8 to concatenate on the first check valve 7, this first check valve 8 only allows the refrigerant to flow from the side of breathing in to the exhaust side, can ensure when a large amount of refrigerants or instantaneous high pressure appear in the side of breathing in, realize automatic quick pressure-sharing through this first check valve 8, the automatic pressure-sharing before specially adapted system perhaps starts when shutting down, thereby avoid the system to take place the backpressure, prevent to cause the damage to compressor 1. In order to further solve the problem of counter pressure, a second bypass pipe 9 is connected between the first pipeline 5 and the second pipeline 6, an electromagnetic valve 10 is connected in series on the second bypass pipe 9, in the running process of the system, the pressure equalizing effect can be realized by controlling the on-off of the electromagnetic valve 10, the electromagnetic valve 10 and the first one-way valve 8 are matched to act, the pressure equalizing effect during the running, the shutdown and the startup of the system can be realized, and the counter pressure of the system can be avoided in each stage; in addition, the electromagnetic valve 10 can also play a role in reducing the exhaust high-pressure side pressure and increasing the suction low-pressure side pressure in the system shutdown process, so that the problems that the compressor 1 is reversed and the compressor 1 cannot be started for a long time after being restarted can be avoided, and the normal and stable operation of the unit is ensured.

Continuing to refer to fig. 1, the refrigerant circulation system in this embodiment further includes an oil-gas separator 30, the oil-gas separator 30 is connected in series to the first pipeline 5 and is located between the compressor 1 and the first branch point 51, the oil-gas separator 30 has an oil return port, the oil return port of the oil-gas separator 30 is connected to the second pipeline 6 through a third pipeline 40, and an oil return capillary tube 50 is connected in series to the third pipeline 40; the oil-gas separator 30 is used for separating the refrigeration lubricant from the refrigerant gas, so that the refrigeration efficiency of the refrigerant is improved, and the refrigeration lubricant flows back into the compressor 1 through the oil return capillary tube 50 to ensure the lubrication function of the compressor 1.

In addition, the refrigerant circulation system of the present embodiment further includes a second check valve 20 connected to the first pipe 5, and the second check valve 20 only allows the refrigerant to flow from the exhaust port 12 of the compressor 1 to the outdoor heat exchanger 2, so as to prevent the refrigerant in the outdoor heat exchanger 2 from flowing back into the compressor 1, which may cause liquid-carrying startup during next startup and affect the service life of the system.

Preferably, as shown in fig. 1, the second check valve 20 is provided between the first branch point 51 and the outdoor heat exchanger 2; however, as an alternative, the second check valve 20 may also be provided between the discharge port 12 of the compressor 1 and the first fulcrum 51.

In some embodiments of the present application, the second pipeline is further connected in series with a gas-liquid separator 60, the second pivot 61 is located between the gas-liquid separator 60 and the compressor 1, the gas-liquid separator 60 can separate the refrigerant coming out of the indoor heat exchanger 4 into gas and liquid, and only the gas returns into the compressor 1, so as to avoid that the liquid refrigerant enters the compressor 1 to cause liquid impact, dilution of the lubricating oil to cause abrasion, and the like.

In some embodiments, the pipeline connecting the throttling device 3 and the outdoor heat exchanger 2 is further connected in series with a liquid storage tank 70, as shown in fig. 1 in particular, the liquid storage tank 70 can store liquid refrigerant, so as to ensure the system refrigerant to be called up.

For example, the throttling device 3 in the embodiment of the present application adopts a throttling valve, which not only can realize throttling but also can perform a flow regulation function; the throttle device 3 may also be configured as a capillary tube, for example.

In the present embodiment, the pressure sensors 80 are provided at the suction port 11 and the discharge port 12 of the compressor 1, respectively, so that the refrigerant pressures on the low pressure side and the high pressure side of the system can be monitored in real time.

In summary, in the refrigerant circulation system in the embodiment of the present application, the first bypass pipeline is connected between the suction port side and the exhaust port side of the compressor, the first check valve is connected in series to the first bypass pipeline, and the first check valve only allows the refrigerant to flow from the suction port side to the exhaust port side, so that when a large amount of refrigerants or instantaneous high pressure occurs on the suction port side, automatic and quick pressure equalization can be realized through the first check valve, and the refrigerant circulation system is particularly suitable for automatic pressure equalization during shutdown or before startup of the system, and can prevent the system from back pressure, thereby avoiding damage to the compressor.

This written description discloses the application with reference to the drawings, and also enables one skilled in the art to practice the application, including making and using any devices or systems, using suitable materials, and using any incorporated methods. The scope of the present application is defined by the claims and includes other examples that occur to those skilled in the art. Such other examples are to be considered within the scope of the claims as long as they include structural elements that do not differ from the literal language of the claims, or that they include equivalent structural elements with insubstantial differences from the literal language of the claims.

Claims

1. A refrigerant circulation system, comprising:

a compressor;

2. The refrigerant circulation system according to claim 1, wherein a second bypass pipe is further connected between the first pipe and the second pipe, and an electromagnetic valve is connected to the second bypass pipe in series.

3. The refrigerant circulation system as claimed in claim 1, further comprising:

4. The refrigerant circulation system as claimed in claim 3, wherein an oil return capillary tube is connected in series to the third pipe.

5. The refrigerant cycle system as claimed in claim 1, wherein a second check valve for allowing the refrigerant to flow only from the discharge port of the compressor to the outdoor heat exchanger is connected in series to the first pipe.

6. The refrigerant cycle system as claimed in claim 5, wherein the second check valve is disposed between the first branch point and the outdoor heat exchanger.

7. The refrigerant circulation system as claimed in claim 1, wherein a gas-liquid separator is further connected in series to the second pipe, and the second fulcrum is located between the gas-liquid separator and the compressor.

8. The refrigerant cycle system as claimed in claim 1, wherein a liquid storage tank is further connected in series to a pipe connecting the throttling device and the outdoor heat exchanger.

9. The refrigerant circulation system as claimed in claim 1, wherein the throttling means is a throttle valve.

10. The refrigerant cycle system as claimed in any one of claims 1 to 9, wherein pressure sensors are provided at the suction port and the exhaust port of the compressor, respectively.