阅读说明：本技术 一种气液分离系统 (Gas-liquid separation system ) 是由 沈正超 雷朋飞 张利 吴东华 何宇 于 2021-07-01 设计创作，主要内容包括：本发明公开了一种气液分离系统,包括依次连接的压缩机、冷凝器、第一节流装置、蒸发器和气液分离器；气液分离器包括容器本体、流体进管、气体出管以及用于由容器本体内向外输送液体的流体出管；流体进管连接蒸发器,气体出管连接压缩机的回气口,流体出管连接压缩机的回气口,流体出管可在连通和关闭之间切换,流体出管还连接有供热部,供热部可在供热状态和非供热状态之间切换；初始启动时,流体出管切换为关闭状态,供热部停止；工作过程中,流体出管切换为连通状态,根据容器本体内的过热度,供热部为供热状态或非供热状态。根据压缩机不同的工作情况,来调整流体出管和供热部的状态,从而避免液体制冷剂进入压缩机造成液击且同时保证润滑。(The invention discloses a gas-liquid separation system, which comprises a compressor, a condenser, a first throttling device, an evaporator and a gas-liquid separator which are connected in sequence; the gas-liquid separator comprises a container body, a fluid inlet pipe, a gas outlet pipe and a fluid outlet pipe for conveying liquid from the inside to the outside of the container body; the fluid inlet pipe is connected with the evaporator, the gas outlet pipe is connected with the gas return port of the compressor, the fluid outlet pipe can be switched between connection and disconnection, the fluid outlet pipe is also connected with a heat supply part, and the heat supply part can be switched between a heat supply state and a non-heat supply state; when the fluid outlet pipe is initially started, the fluid outlet pipe is switched to a closed state, and the heat supply part stops; in the working process, the fluid outlet pipe is switched to be in a communicated state, and the heat supply part is in a heat supply state or a non-heat supply state according to the superheat degree in the container body. According to the different working conditions of the compressor, the states of the fluid outlet pipe and the heat supply part are adjusted, so that liquid impact caused by liquid refrigerant entering the compressor is avoided, and lubrication is ensured at the same time.)

1. A gas-liquid separation system characterized by: the system comprises a compressor, a condenser, a first throttling device, an evaporator and a gas-liquid separator;

the compressor, the condenser, the first throttling device, the evaporator and the gas-liquid separator are sequentially connected;

the gas-liquid separator comprises a container body, a fluid inlet pipe for inputting gas-liquid mixed fluid into the container body, a gas outlet pipe for conveying gas from the inside of the container body to the outside, and a fluid outlet pipe for conveying liquid from the inside of the container body to the outside; the fluid inlet pipe is connected with the evaporator, the gas outlet pipe is connected with the gas return port of the compressor, the fluid outlet pipe can be switched between connection and disconnection, the fluid outlet pipe is also connected with a heat supply part, and the heat supply part can be switched between a heat supply state and a non-heat supply state;

when the fluid outlet pipe is initially started, the fluid outlet pipe is switched to be in a closed state, and the heat supply part is in a non-heat supply state;

in the working process, the fluid outlet pipe is switched to be in a communicated state, and the heat supply part is in a heat supply state or a non-heat supply state according to the superheat degree in the container body.

2. The gas-liquid separation system according to claim 1, characterized in that: the fluid inlet pipe is arranged at the upper end of the container body, and an inlet of the fluid inlet pipe is arranged outside the container body; the outlet of the fluid inlet pipe extends into the container body;

the gas outlet pipe is arranged at the upper end of the container body, the outlet of the gas outlet pipe is arranged outside the container body, and the inlet of the gas outlet pipe extends into the container body;

the inlet of the fluid outlet pipe is arranged at the bottom of the container body and is communicated with the inside of the container body, and the outlet of the fluid outlet pipe is positioned outside the container body.

3. The gas-liquid separation system according to claim 2, characterized in that: the fluid inlet pipe is L-shaped, and the outlet of the fluid inlet pipe is positioned at the transverse tail end of the L-shape.

4. The gas-liquid separation system according to claim 3, characterized in that: the outlet of the fluid inlet pipe faces away from the inlet of the gas outlet pipe.

5. The gas-liquid separation system according to claim 2, characterized in that: the gas outlet pipe is I-shaped, and the longitudinal length of the gas outlet pipe extending into the container body is equal to or approximately equal to the longitudinal length of the fluid inlet pipe extending into the container body.

6. The gas-liquid separation system according to claim 1, characterized in that: the container body comprises an upper cylinder body and a lower cylinder body which are fixedly spliced in a sealing mode, the fluid inlet pipe and the gas outlet pipe are arranged on the upper cylinder body, and the fluid outlet pipe is arranged on the lower cylinder body.

7. The gas-liquid separation system according to any one of claims 1 to 6, characterized in that: a first branch pipe and a second branch pipe are arranged between the fluid outlet pipe and the return air port of the compressor;

two ends of the first branch pipe are respectively connected with the fluid outlet pipe and the return air port of the compressor, and a first valve is arranged on the first branch pipe;

two ends of the second branch pipe are respectively connected with the fluid outlet pipe and the air return port of the compressor, and a second valve and the heat supply part are arranged on the second branch pipe;

when the heat supply system is started initially, the first valve and the second valve are closed, and the heat supply part is in a non-heat supply state;

in the working process, when the superheat degree in the container body is larger than 0, the first valve is opened, the second valve is closed, and the heat supply part is in a non-heat supply state; when the degree of superheat in the container body is less than 0, the first valve is closed, the second valve is opened, and the heat supply part is in a heat supply state.

8. The gas-liquid separation system according to claim 7, wherein: the heat supply part is a heat regenerator, and a connecting pipeline between the condenser and the first throttling device passes through the heat regenerator.

9. The gas-liquid separation system according to any one of claims 1 to 6, characterized in that: the heat supply part is a heat regenerator, and a third branch pipe and a fourth branch pipe are arranged between the condenser and the first throttling device;

a connecting pipeline between the fluid outlet pipe and a gas return port of the compressor passes through the heat regenerator, and a third valve is arranged between the fluid outlet pipe and the heat regenerator;

two ends of the third branch pipe are respectively connected with the condenser and the first throttling device, and a second throttling device is arranged on the third branch pipe;

two ends of the fourth branch pipe are respectively connected with the condenser and the first throttling device, the fourth branch pipe passes through the heat regenerator, and a third throttling device is arranged in front of the heat regenerator on the fourth branch pipe;

at initial start-up, the third valve is closed, the first and second throttling devices are opened, and the third throttling device is closed;

in the working process, when the superheat degree in the container body is larger than 0, the third valve is opened, the first throttling device and the second throttling device are opened, and the third throttling device is closed; when the superheat degree in the container body is less than 0, the third valve is opened, the first throttling device and the third throttling device are opened, and the second throttling device is closed.

10. The gas-liquid separation system according to claim 7, wherein: the opening degree of the first throttling device and/or the second throttling device and/or the third throttling device is adjustable.

Technical Field

The invention belongs to the technical field of heat pumps, and particularly relates to a gas-liquid separation system.

Background

The traditional gas-liquid separator has the internal structure that the gas-liquid separator adopts a U-shaped gas return pipe, oil is returned in a mode that an oil return hole is formed in the bottom of a U-shaped pipe, and the structure of the gas-liquid separator has the problems that insufficient oil return can be caused under certain working conditions; secondly, when refrigerant liquid exists in the gas-liquid separator, the refrigerant liquid can enter the compressor through the oil return hole to cause liquid impact; when the refrigerant liquid in the gas-liquid separator is excessive, the refrigerant liquid can directly return to the compressor from the tail end of the U-shaped gas return pipe; the above three points easily cause the compressor to be burnt out, thereby affecting the safety and reliability of the operation of the compressor.

Therefore, a new technology is needed to solve the problem that the structural problem of the gas-liquid separator in the prior art affects the safety and reliability of the operation.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a gas-liquid separation system, which has enough oil return amount, can avoid liquid impact, avoid burning of a compressor and ensure the safety and reliability of the operation of the compressor.

The invention adopts the following technical scheme:

a gas-liquid separation system comprises a compressor, a condenser, a first throttling device, an evaporator and a gas-liquid separator;

the compressor, the condenser, the first throttling device, the evaporator and the gas-liquid separator are sequentially connected;

the gas-liquid separator comprises a container body, a fluid inlet pipe for inputting gas-liquid mixed fluid into the container body, a gas outlet pipe for conveying gas from the inside of the container body to the outside, and a fluid outlet pipe for conveying liquid from the inside of the container body to the outside; the fluid inlet pipe is connected with the evaporator, the gas outlet pipe is connected with the gas return port of the compressor, the fluid outlet pipe can be switched between connection and disconnection, the fluid outlet pipe is also connected with a heat supply part, and the heat supply part can be switched between a heat supply state and a non-heat supply state;

when the fluid outlet pipe is initially started, the fluid outlet pipe is switched to be in a closed state, and the heat supply part is in a non-heat supply state;

in the working process, the fluid outlet pipe is switched to be in a communicated state, and the heat supply part is in a heat supply state or a non-heat supply state according to the superheat degree in the container body.

As a further improvement of the technical scheme of the invention, the fluid inlet pipe is arranged at the upper end of the container body, and an inlet of the fluid inlet pipe is arranged outside the container body; the outlet of the fluid inlet pipe extends into the container body;

the gas outlet pipe is arranged at the upper end of the container body, the outlet of the gas outlet pipe is arranged outside the container body, and the inlet of the gas outlet pipe extends into the container body;

the inlet of the fluid outlet pipe is arranged at the bottom of the container body and is communicated with the inside of the container body, and the outlet of the fluid outlet pipe is positioned outside the container body.

As a further improvement of the technical scheme of the invention, the fluid inlet pipe is L-shaped, and the outlet of the fluid inlet pipe is positioned at the transverse tail end of the L-shape.

As a further improvement of the technical solution of the present invention, the outlet of the fluid inlet pipe is away from the inlet of the gas outlet pipe.

As a further improvement of the technical scheme of the invention, the gas outlet pipe is in an I shape, and the longitudinal length of the gas outlet pipe extending into the container body is equal to or approximately equal to the longitudinal length of the fluid inlet pipe extending into the container body.

As a further improvement of the technical scheme of the invention, the container body comprises an upper cylinder and a lower cylinder which are fixedly spliced in a sealing manner, the fluid inlet pipe and the gas outlet pipe are both arranged on the upper cylinder, and the fluid outlet pipe is arranged on the lower cylinder.

As a further improvement of the technical scheme of the invention, a first branch pipe and a second branch pipe are arranged between the fluid outlet pipe and the return air port of the compressor;

two ends of the first branch pipe are respectively connected with the fluid outlet pipe and the return air port of the compressor, and a first valve is arranged on the first branch pipe;

two ends of the second branch pipe are respectively connected with the fluid outlet pipe and the air return port of the compressor, and a second valve and the heat supply part are arranged on the second branch pipe;

when the heat supply system is started initially, the first valve and the second valve are closed, and the heat supply part is in a non-heat supply state;

in the working process, when the superheat degree in the container body is larger than 0, the first valve is opened, the second valve is closed, and the heat supply part is in a non-heat supply state; when the degree of superheat in the container body is less than 0, the first valve is closed, the second valve is opened, and the heat supply part is in a heat supply state.

As a further improvement of the technical scheme of the invention, the heat supply part is a heat regenerator, and a connecting pipeline between the condenser and the first throttling device passes through the heat regenerator.

As a further improvement of the technical scheme of the invention, the heat supply part is a heat regenerator, and a third branch pipe and a fourth branch pipe are arranged between the condenser and the first throttling device;

a connecting pipeline between the fluid outlet pipe and a gas return port of the compressor passes through the heat regenerator, and a third valve is arranged between the fluid outlet pipe and the heat regenerator;

two ends of the third branch pipe are respectively connected with the condenser and the first throttling device, and a second throttling device is arranged on the third branch pipe;

two ends of the fourth branch pipe are respectively connected with the condenser and the first throttling device, the fourth branch pipe passes through the heat regenerator, and a third throttling device is arranged in front of the heat regenerator on the fourth branch pipe;

at initial start-up, the third valve is closed, the first and second throttling devices are opened, and the third throttling device is closed;

in the working process, when the superheat degree in the container body is larger than 0, the third valve is opened, the first throttling device and the second throttling device are opened, and the third throttling device is closed; when the superheat degree in the container body is less than 0, the third valve is opened, the first throttling device and the third throttling device are opened, and the second throttling device is closed.

As a further improvement of the technical solution of the present invention, the opening degree of the first throttling device and/or the second throttling device and/or the third throttling device is adjustable.

Compared with the prior art, the invention has the beneficial effects that:

in the gas-liquid separation system, three ports are arranged for gas-liquid separation, a fluid inlet pipe is used for inputting a refrigerant (liquid and/or gas) and lubricating oil, a fluid outlet pipe is used for discharging the lubricating oil and the liquid refrigerant, and a gas outlet pipe is used for discharging the gas refrigerant; the fluid outlet pipe can be switched to be connected and disconnected, so that the compressor can be lubricated only by oil in the compressor at the moment of starting and running of the compressor, the fluid outlet pipe can be closed at the moment, lubricating oil is not conveyed to the compressor, and liquid refrigerant in the container body is prevented from entering the compressor to cause liquid impact, so that the compressor is protected; in the operation process, when the superheat degree in the gas-liquid separator is larger than 0, no liquid refrigerant exists in the gas-liquid separator, the fluid outlet pipe can be opened at the moment, the heat supply part is in a non-heat supply state and does not supply heat, lubricating oil is conveyed to the compressor through the fluid outlet pipe, and the oil return amount of the compressor is ensured; in the operation process, when the inside superheat degree of vapour and liquid separator is less than 0, the inside liquid refrigerant that exists of vapour and liquid separator at this moment, heat supply portion is the heat supply state and opens fluid exit tube, makes the inside liquid refrigerant of vapour and liquid separator evaporate for the gas state through heat supply portion, prevents that the compressor from returning the liquid and guaranteeing back to oil volume simultaneously. Because at the in-process of operation, the fluid exit tube keeps the intercommunication, only change the state of heat supply portion, make the fluid exit tube can be constantly to the compressor transport lubricating oil, guarantee the oil return volume of compressor, simultaneously according to the size of the calorie of heat, under the help of heat supply portion, the liquid refrigerant of following fluid exit tube exhaust can evaporate for the gaseous state reentrant compressor, avoid causing the liquid attack, because the existence of heat supply portion, even this internal accumulation of container liquid refrigerant more also can not cause the liquid attack to the compressor, thereby avoid the compressor to burn out, guarantee the security and the reliability of compressor operation.

Drawings

The technology of the present invention will be described in further detail with reference to the accompanying drawings and detailed description below:

FIG. 1 is a schematic diagram of an embodiment of a gas-liquid separation system of the present invention;

FIG. 2 is a schematic view of another embodiment of the gas-liquid separation system of the present invention;

FIG. 3 is a schematic view of the structure of the gas-liquid separator of the present invention.

Reference numerals:

1-a compressor;

2-a condenser; 21-a third branch pipe; 211-second throttling means; 22-a fourth branch; 221-third throttling means;

3-a first throttling means;

4-an evaporator;

5-a gas-liquid separator; 51-a container body; 511-upper cylinder; 512-lower cylinder; 52-fluid inlet pipe; 53-gas outlet pipe; 54-a fluid outlet pipe; 541-a first branch pipe; 5411-first valve; 542-second branch pipe; 5421-second valve; 543-a third valve;

6-heat regenerator.

Detailed Description

The conception, the specific structure and the technical effects of the present invention will be clearly and completely described in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the schemes and the effects of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The same reference numbers will be used throughout the drawings to refer to the same or like parts.

It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. Further, the description of the upper, lower, left, right, etc. used in the present invention is only with respect to the positional relationship of the respective components of the present invention with respect to each other in the drawings.

Referring to fig. 1 to 3, a gas-liquid separation system includes a compressor 1, a condenser 2, a first throttling device 3, an evaporator 4, and a gas-liquid separator 5.

The compressor 1, the condenser 2, the first throttling device 3, the evaporator 4 and the gas-liquid separator 5 are sequentially connected and correspondingly connected through pipelines.

The gas-liquid separator 5 includes a container body 51, a fluid inlet pipe 52 for introducing a gas-liquid mixed fluid into the container body 51, a gas outlet pipe 53 for delivering a gas from the inside of the container body 51 to the outside, and a fluid outlet pipe 54 for delivering a liquid from the inside of the container body 51 to the outside; the fluid inlet pipe 52 is connected with the evaporator 4, the gas outlet pipe 53 is connected with a return gas port of the compressor 1, the fluid outlet pipe 54 is connected with the return gas port of the compressor 1, the fluid outlet pipe 54 can be switched between connection and disconnection, and the fluid outlet pipe 54 is also connected with a heat supply part which can be switched between a heat supply state and a non-heat supply state. When the heat supply part is a heater, the state switching is controlled by the power supply, the power supply is switched on, the heat is supplied, and the power supply is switched off, and the heat is not supplied; when the heat supply part is a heat regenerator, the heat supply part is controlled by the connectivity of a pipeline connected with the heat regenerator, and heat is supplied when the pipeline is communicated, and heat is not supplied when the pipeline is not communicated. The heat supply section can provide heat to evaporate the liquid refrigerant, and is preferably a regenerator 6, without generating additional heat.

When the fluid outlet pipe 54 is initially started, the fluid outlet pipe is switched to a closed state, and the heat supply part is in a non-heat supply state and does not supply heat. That is, at the moment when the compressor 1 is started and operated, the compressor 1 can be lubricated only by the oil inside the compressor 1, and at this time, the fluid outlet pipe 54 can be closed, so that the lubricating oil is not delivered to the compressor 1, and meanwhile, the liquid refrigerant in the container body 51 is prevented from entering the compressor 1 to cause liquid impact, so that the compressor 1 is protected.

In the operation, the fluid outlet pipe 54 is switched to a communication state, and the heat supply portion is in a heat supply state or a non-heat supply state according to the degree of superheat in the container body 51. The degree of superheat in the container body 51 has 2 cases, which are:

1. when the superheat degree in the gas-liquid separator 5 is larger than 0, and no liquid refrigerant exists in the gas-liquid separator 5, the fluid outlet pipe 54 can be opened at the moment, the heat supply part is in a non-heat supply state, harmful suction superheat is avoided, lubricating oil is conveyed to the compressor 1 through the fluid outlet pipe 54, and the oil return amount of the compressor 1 is ensured.

2. When the superheat degree in the gas-liquid separator 5 is smaller than 0, at this time, liquid refrigerant exists in the gas-liquid separator 5, the heat supply portion is in a heat supply state to supply heat, and the fluid outlet pipe 54 is opened, so that the liquid refrigerant in the gas-liquid separator 5 is evaporated into a gas state through the heat supply portion, and the liquid return of the compressor 1 is prevented, and the oil return amount is ensured.

In the operation process, the fluid outlet pipe 54 is communicated, and only the state of the heat supply part is changed, so that the fluid outlet pipe 54 can continuously convey lubricating oil to the compressor 1, and the oil return amount of the compressor 1 is ensured. Meanwhile, according to the size of the excessive heat, under the help of the heat supply part, the liquid refrigerant discharged from the fluid outlet pipe 54 can be evaporated into a gas state and then enters the compressor 1, so that liquid impact is avoided, and even if more liquid refrigerants accumulated in the container body 51 cannot cause liquid impact on the compressor 1 due to the existence of the heat supply part, the compressor 1 is prevented from being burnt, and the safety and the reliability of the operation of the compressor 1 are ensured.

In one embodiment, as shown in fig. 3, the fluid inlet pipe 52 is disposed at the upper end of the container body 51, and the inlet of the fluid inlet pipe 52 is disposed outside the container body 51; the outlet of the fluid inlet pipe 52 extends into the container body 51; the gas outlet pipe 53 is arranged at the upper end of the container body 51, the outlet of the gas outlet pipe 53 is arranged outside the container body 51, and the inlet of the gas outlet pipe 53 extends into the container body 51; an inlet of the fluid outlet pipe 54 is disposed at the bottom of the container body 51 and is communicated with the inside of the container body 51, and an outlet of the fluid outlet pipe 54 is located outside the container body 51.

In the above structural design, since the inlet of the fluid outlet pipe 54 is at the bottom, the lubricant oil is accumulated at the bottom of the container body 51 due to being liquid and is then discharged through the fluid outlet pipe 54, so as to achieve oil return, of course, if there is a liquid refrigerant, the liquid refrigerant is also discharged from the fluid outlet pipe 54, in order to avoid liquid impact, after the liquid refrigerant enters the fluid outlet pipe 54, the heat supply unit is started to operate, the liquid refrigerant obtains heat and is evaporated into a gaseous refrigerant, and then the gaseous refrigerant is input to the compressor 1, and of course, the gaseous refrigerant in the container body 51 is also discharged to the compressor 1 through the gas outlet pipe 53.

In one implementation, the fluid inlet tube 52 is L-shaped, and the outlet of the fluid inlet tube 52 is located at the lateral end of the L-shape. Preferably, the outlet of the fluid inlet pipe 52 is away from the inlet of the gas outlet pipe 53, that is, the outlet of the fluid inlet pipe 52 and the inlet of the gas outlet pipe 53 are separated as much as possible, so as to avoid that the liquid refrigerant entering the fluid inlet pipe 52 splashes into the gas outlet pipe 53 and causes liquid slugging. The gas outlet pipe 53 is I-shaped, the longitudinal length of the gas outlet pipe 53 extending into the container body 51 is equal to or approximately equal to the longitudinal length of the fluid inlet pipe 52 extending into the container body 51, and both are located at the upper end of the container body 51, so that the gaseous refrigerant can be conveniently discharged.

Because the fluid inlet pipe 52 is L-shaped, it is difficult to directly install the fluid inlet pipe in a complete container body 51, and for convenience of installation, the container body 51 includes an upper cylinder 511 and a lower cylinder 512 which are fixed by sealing and splicing, the fluid inlet pipe 52 and the gas outlet pipe 53 are both disposed on the upper cylinder 511, and the fluid outlet pipe 54 is disposed on the lower cylinder 512. By dividing the container body 51 into two parts, it is convenient to install the fluid inlet pipe 52 and the gas outlet pipe 53 into the container body 51 at the time of assembly. The upper end of the lower cylinder 512 is open, the lower end of the upper cylinder 511 is open, and the lower end of the upper cylinder 511 is inserted into the upper end of the lower cylinder 512 and is fixedly connected in a sealing manner, specifically, the upper cylinder and the lower cylinder are welded and fixed together, so that fixation and sealing are realized, and the lower cylinder and the upper cylinder are sealed again in an inserting manner to ensure air tightness. In addition, the end of the lower cylinder 512, which is far away from the upper cylinder 511, is provided with a fixing base, the fixing base is fixedly connected with the bottom of the lower cylinder 512, and the fixing base is used for fixing, so that the container body 51 is prevented from shifting or overturning in the using process, the upper and lower positions of the fluid inlet pipe 52, the gas outlet pipe 53 and the fluid outlet pipe 54 are prevented from being affected, and the occurrence of faults is avoided. The container body 51 comprises an upper cylinder 511 and a lower cylinder 512 which are fixed in a sealing and splicing manner, the fluid inlet pipe 52 and the gas outlet pipe 53 are both arranged on the upper cylinder 511, and the fluid outlet pipe 54 is arranged on the lower cylinder 512.

In one embodiment, as shown in fig. 1, a first branch 541 and a second branch 542 are provided between the fluid outlet pipe 54 and the return port of the compressor 1; two ends of the first branch pipe 541 are respectively connected with the fluid outlet pipe 54 and the return air port of the compressor 1, and a first valve 5411 is arranged on the first branch pipe 541; two ends of the second branch pipe 542 are respectively connected with the fluid outlet pipe 54 and the return port of the compressor 1, and the second branch pipe 542 is provided with a second valve 5421 and the heat supply part.

When the compressor is started initially, the first valve 5411 and the second valve 5421 are closed, the heat supply part is in a non-heat supply state, heat is not supplied, the compressor 1 can be lubricated only by oil in the compressor 1, and the first valve 5411 and the second valve 5421 are closed, so that refrigerant liquid in the gas-liquid separator 5 is prevented from entering the compressor 1.

In the working process, when the degree of superheat in the container body 51 is larger than 0, the first valve 5411 is opened, the second valve 5421 is closed, and the heat supply part is in a non-heat supply state and does not supply heat. At this time, there is no liquid refrigerant, so there is no fear of liquid impact, and the heat supply part stops supplying heat, thereby preventing harmful suction overheating. When the degree of superheat in the container body 51 is less than 0, the first valve 5411 is closed, the second valve 5421 is opened, the heat supply part is in a heat supply state to supply heat, and liquid refrigerant coming out of the bottom of the gas-liquid separator 5 is evaporated through the heat supply part to avoid liquid impact. Specifically, the heat supply portion is a heat regenerator 6, a connecting pipeline between the condenser 2 and the first throttling device 3 passes through the heat regenerator 6, and the medium-temperature refrigerant liquid at the outlet of the condenser 2 and the low-temperature refrigerant liquid coming out from the bottom of the gas-liquid separator 5 exchange heat through the heat regenerator 6, so that a certain suction superheat degree is ensured, the probability of suction liquid return of the compressor 1 is reduced, and the safety and the reliability of the operation of the compressor 1 are improved.

In one embodiment, as shown in fig. 2, the heat supply part is a heat regenerator 6, and a third branch pipe 21 and a fourth branch pipe 22 are arranged between the condenser 2 and the first throttling device 3; a connecting pipeline between the fluid outlet pipe 54 and the return port of the compressor 1 passes through the heat regenerator 6, and a third valve 543 is arranged between the fluid outlet pipe 54 and the heat regenerator 6; two ends of the third branch pipe 21 are respectively connected with the condenser 2 and the first throttling device 3, and a second throttling device 211 is arranged on the third branch pipe 21; two ends of the fourth branch pipe 22 are respectively connected with the condenser 2 and the first throttling device 3, the fourth branch pipe 22 passes through the heat regenerator 6, and a third throttling device 221 is arranged in front of the heat regenerator 6 in the fourth branch pipe 22.

At the initial start, the third valve 543 is closed, the first throttle device 3 and the second throttle device 211 are opened, and the third throttle device 221 is closed. The compressor 1 can be lubricated only by oil inside the compressor 1, and at the moment, an oil return pipeline at the bottom of the gas-liquid separator 5 is closed, so that refrigerant liquid inside the gas-liquid separator 5 is prevented from entering the compressor 1.

In the operation process, when the degree of superheat in the container body 51 is greater than 0, the third valve 543 is opened, the first throttling device 3 and the second throttling device 211 are opened, and the third throttling device 221 is closed. At this point there is no liquid refrigerant, so the third throttling means 221 is closed to avoid harmful excessive heat absorption and the lubricant oil can be delivered directly to the compressor 1 through the fluid outlet pipe 54.

When the degree of superheat in the container body 51 is less than 0, the third valve 543 is opened, the first throttle device 3 and the third throttle device 221 are opened, and the second throttle device 211 is closed. The third valve 543 is opened, the lubricating oil and the liquid refrigerant enter the pipeline, and when the lubricating oil and the liquid refrigerant pass through the heat regenerator 6, the medium temperature refrigerant liquid at the outlet of the condenser 2 exchanges heat with the low temperature refrigerant liquid coming out from the bottom of the gas-liquid separator 5, so that a certain suction superheat degree is ensured, the probability of suction liquid return of the compressor 1 is reduced, and the safety and the reliability of the operation of the compressor 1 are improved.

In addition, the opening degree of the first throttle device 3 and/or the second throttle device 211 and/or the third throttle device 221 is adjustable, the first throttle device 3, the second throttle device 211 and the third throttle device 221 are expansion valves, especially electronic expansion valves, the suction superheat degree of the compressor 1 can be controlled within a reasonable range through the adjustment of the opening degree of the 3 electronic expansion valves, harmful overheating is reduced, the suction superheat degree of the compressor 1 is prevented from being overhigh, and the safety and the reliability of the operation of the compressor 1 are improved.

The first valve 5411, the second valve 5421, and the third valve 543 may be solenoid valves.

Other contents of the gas-liquid separation system of the present invention are referred to in the prior art and will not be described herein.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.