Condensation tank and refrigerant purification system

Abstract

The utility model relates to a condensation tank and a refrigerant purification system. The condensation tank comprises a condensation tank gas collection port, a condensation pipe, a refrigerant backflow port and a condensation tank exhaust port. A gas collecting port of the condensing tank is connected with a gas taking port of the condenser, a first pipe orifice of the condensing pipe is connected with a liquid taking port of the condenser, the liquid taking port is formed in a liquid refrigerant layer of the condenser, a second pipe orifice and a refrigerant backflow port of the condensing pipe are respectively connected with the liquid refrigerant recovery unit, and an exhaust port of the condensing tank is connected with the non-condensable gas exhaust unit. By adopting the condenser pipe, mixed gas in the condenser can be efficiently separated at low cost, and a refrigerant in a gaseous refrigerant layer of the condenser can be purified.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration equipment, and particularly to a condensation tank and a refrigerant purification system. Background Art

[0002] A water chiller is the refrigeration source of refrigeration equipment. When the water chiller on the market is working, since the working pressure is lower than the atmospheric pressure, a low-pressure area with a lower air pressure than the atmosphere will be formed inside the water chiller, resulting in non-condensable gases such as air entering the inside of the water chiller through the low-pressure area. For example, it enters the gaseous refrigerant layer at the top of the condenser in the water chiller, causing the non-condensable gas to mix with the gaseous refrigerant at the top of the condenser, and a mixed gas is formed in the gaseous refrigerant layer at the top of the condenser (the refrigerant inside the condenser can be divided into three layers from top to bottom: gaseous refrigerant layer, gas-liquid mixed refrigerant layer, and liquid refrigerant layer). As more and more non-condensable gases enter the condenser, the condensation capacity of the condenser will decrease, affecting the refrigeration effect of the refrigeration equipment.

[0003] In the traditional technology, it usually costs more to use special equipment and go through multiple process flows to separate the mixed gas in the condenser. Therefore, there is an urgent need for a device that can separate the mixed gas in the condenser at low cost and efficiently and purify the refrigerant in the gaseous refrigerant layer of the condenser. Summary of the Utility Model

[0004] Based on this, in view of the technical problem that it costs more to separate the mixed gas in the condenser through multiple process flows, there is a need to provide a condensation tank and a refrigerant purification system.

[0005] In a first aspect, the present application provides a condensation tank, including a condensation tank gas collection port, a condensation pipe, a refrigerant return port, and a condensation tank exhaust port;

[0006] The condensation tank gas collection port is connected to the gas extraction port of the condenser. The first pipe orifice of the condensation pipe is connected to the liquid extraction port of the condenser, and the liquid extraction port is arranged in the liquid refrigerant layer of the condenser. The second pipe orifice of the condensation pipe and the refrigerant return port are respectively connected to the liquid refrigerant recovery unit, and the condensation tank exhaust port is connected to the non-condensable gas discharge unit;

[0007] The condensation tank gas collection port is used to collect the mixed gas in the condenser, and the mixed gas includes gaseous refrigerant and non-condensable gas;

[0008] The condensation pipe is used to condense the gaseous refrigerant in the condensation tank into liquid refrigerant, so as to separate the gaseous refrigerant and non-condensable gas in the condensation tank;

[0009] The refrigerant return port is used to export the liquid refrigerant deposited at the bottom of the condensation tank after condensation to the liquid refrigerant recovery unit;

[0010] The exhaust port of the condensation tank is used to export the separated non-condensable gas to the non-condensable gas discharge unit.

[0011] In one embodiment, the gas collection port of the condensation tank is connected to the gas intake port of the condenser through a first solenoid valve to connect to the gaseous refrigerant layer at the top of the condenser, and a mixed gas is gathered in the gaseous refrigerant layer.

[0012] In one embodiment, the first pipe orifice of the condensation pipe is connected to the liquid intake port of the condenser through an expansion valve and a second solenoid valve.

[0013] In one embodiment, the condensation tank further includes:

[0014] A housing, and a refrigerant return port is provided at the bottom of the housing;

[0015] A partition board that divides the housing into a first space and a second space with a bottom connection. The gas collection port of the condensation tank is arranged at the top of the first space, and the exhaust port of the condensation tank is arranged at the top of the second space;

[0016] The condensation pipe passes through the partition board, penetrating through the first space and the second space; the gaseous refrigerant collected by the gas collection port of the condensation tank is condensed by the condensation pipe and deposited at the bottom of the housing; the non-condensable gas collected by the gas collection port of the condensation tank passes through the first space and the second space and is then exported from the exhaust port of the condensation tank.

[0017] In one embodiment, the condensation tank further includes:

[0018] A gas-liquid separation plate is arranged at the top of the second space and below the exhaust port of the condensation tank, and is used for separating the non-condensable gas and the liquid refrigerant carried in the non-condensable gas.

[0019] In one embodiment, the condensation tank further includes:

[0020] Fins, and at least one fin is respectively arranged in the first space and the second space.

[0021] The above-mentioned condensation tank includes a condensation tank gas collection port, a condensation pipe, a refrigerant return port, and a condensation tank exhaust port. The condensation tank gas collection port is connected to the gas extraction port of the condenser, so that the condensation tank can collect the mixed gas (including gaseous refrigerant and non-condensable gas) in the condenser through the condensation tank gas collection port. Further, the first pipe orifice of the condensation pipe is connected to the liquid extraction port of the condenser, and the liquid extraction port is arranged in the liquid refrigerant layer of the condenser, so that the condensation pipe can introduce the liquid refrigerant in the condenser as a cold source, thereby condensing the gaseous refrigerant in the condensation tank into a liquid refrigerant, separating the gaseous refrigerant and non-condensable gas in the condensation tank. The second pipe orifice of the condensation pipe and the refrigerant return port are respectively connected to the liquid refrigerant recovery unit, so that the liquid refrigerant recovery unit can recover the liquid refrigerant in the condensation pipe through the second pipe orifice and recover the liquid refrigerant deposited at the bottom of the condensation tank after condensation through the refrigerant return port. Further still, the condensation tank exhaust port is connected to the non-condensable gas discharge unit, so that the non-condensable gas discharge unit can export the non-condensable gas separated in the condensation tank through the condensation tank exhaust port, and then discharge the non-condensable gas. By adopting the above-mentioned condensation tank, there is no need to consume additional cost to introduce a refrigerant into the condensation pipe, and there is no need to go through multiple process flows. The mixed gas collected from the condenser can be separated conveniently and efficiently through the condensation pipe, and the liquid refrigerant in the condensation pipe and the liquid refrigerant obtained by condensation and liquefaction separation can also be recovered, and the separated non-condensable gas can be discharged, which can realize the separation of the mixed gas in the condenser at low cost and high efficiency, and purify the refrigerant in the gaseous refrigerant layer of the condenser.

[0022] In a second aspect, the present application provides a refrigerant purification system, including a condenser, a liquid refrigerant recovery unit, and the above-mentioned condensation tank;

[0023] A gas return port is arranged at the top of the condenser. The gas return port is connected to the liquid refrigerant recovery unit. The liquid refrigerant recovery unit is used to recover the liquid refrigerant led out from the refrigerant return port of the condensation tank and the liquid refrigerant in the condensation pipe in the condensation tank, and convert the recovered liquid refrigerant into gaseous refrigerant, so that the converted gaseous refrigerant flows back to the gas return port and enters the gaseous refrigerant layer of the condenser.

[0024] In one embodiment, the liquid refrigerant recovery unit includes an evaporator;

[0025] The evaporator is provided with a first liquid supply port, a second liquid supply port, and an evaporation port. The first liquid supply port is connected to the refrigerant return port, the second liquid supply port is connected to the second pipe orifice of the condensation pipe, and the evaporation port is connected to the gas return port.

[0026] In one embodiment, the liquid refrigerant recovery unit further includes a compressor, and the compressor is arranged between the evaporation port and the gas return port.

[0027] In one embodiment, the refrigerant purification system further includes a non-condensable gas discharge unit, and the non-condensable gas discharge unit is used to discharge the non-condensable gas led out from the condensation tank exhaust port of the condensation tank.

[0028] In one embodiment, the non-condensable gas discharge unit includes a gas tank and a vacuum pump;

[0029] The gas tank includes a gas tank gas collection port and a gas tank exhaust port. The gas tank gas collection port is connected to the condensate tank exhaust port of the condensate tank through a third solenoid valve, and the gas tank exhaust port is connected to the vacuum pump through a fourth solenoid valve.

[0030] In one embodiment, the gas tank further includes a pressure sensor for detecting the air pressure inside the gas tank;

[0031] When the air pressure inside the gas tank rises to the first air pressure threshold, the third solenoid valve closes, the fourth solenoid valve conducts, and the vacuum pump starts to operate;

[0032] When the air pressure inside the gas tank drops to the second air pressure threshold, the third solenoid valve conducts, the fourth solenoid valve closes, and the vacuum pump stops operating.

[0033] The above-mentioned refrigerant purification system includes a condenser, a liquid refrigerant recovery unit, and the above-mentioned condensate tank. A return air port is provided at the top of the condenser, and the return air port is connected to the liquid refrigerant recovery unit. The liquid refrigerant recovery unit is used to recover the liquid refrigerant led out from the refrigerant return port of the condensate tank and the liquid refrigerant in the condensate pipe in the condensate tank, and convert the recovered liquid refrigerant into gaseous refrigerant, so that the converted gaseous refrigerant flows back to the return air port and enters the gaseous refrigerant layer of the condenser. With the above-mentioned refrigerant purification system, there is no need to consume additional costs to introduce a refrigerant into the condensate pipe in the condensate tank, and there is no need to go through multiple process flows. The mixed gas collected from the condenser can be conveniently and efficiently separated through the condensate pipe, and the liquid refrigerant in the condensate pipe and the liquid refrigerant separated by condensation and liquefaction can also be recovered. It can realize the separation of the mixed gas in the condenser at low cost and high efficiency, and purify the refrigerant in the gaseous refrigerant layer of the condenser. Description of the Drawings

[0034] Figure 1 It is a schematic diagram of the structure of the condensate tank and the application environment of the condensate tank in one embodiment;

[0035] Figure 2 It is a schematic diagram of the application environment of the condensate tank including a first solenoid valve in one embodiment;

[0036] Figure 3 It is a schematic diagram of the application environment of the condensate tank including an expansion valve and a second solenoid valve in one embodiment;

[0037] Figure 4 It is a schematic diagram of the application environment of the condensate tank including an expansion valve and a second solenoid valve in another embodiment;

[0038] Figure 5 It is a schematic diagram of the structure of the condensate tank including a partition in one embodiment;

[0039] Figure 6 Schematic diagram of a condensate tank structure including a gas-liquid separation plate in an embodiment;

[0040] Figure 7 Schematic diagram of a condensate tank structure including fins in an embodiment;

[0041] Figure 8 Schematic diagram of a refrigerant purification system in an embodiment;

[0042] Figure 9 Schematic diagram of a refrigerant purification system including an evaporator in an embodiment;

[0043] Figure 10 Schematic diagram of a refrigerant purification system including a compressor in an embodiment;

[0044] Figure 11 Schematic diagram of a refrigerant purification system including a non-condensable gas discharge unit in an embodiment;

[0045] Figure 12 Schematic diagram of a refrigerant purification system including a gas tank and a vacuum pump in an embodiment;

[0046] Figure 13 Schematic diagram of a refrigerant purification system including a pressure sensor in an embodiment. Detailed implementation manners

[0047] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0048] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0049] It should be understood that in this application, terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to this application. In addition, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. When an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] To separate the mixed gas in the condenser at low cost and efficiently and purify the refrigerant in the gaseous refrigerant layer of the condenser, an embodiment of this application provides a condensation tank, the structure of the condensation tank, and the application environment of the condensation tank, specifically as follows Figure 1 shown, where:

[0051] The condensation tank 1 includes a condensation tank gas collection port 10, a condensation pipe 11, a refrigerant return port 12, and a condensation tank exhaust port 13;

[0052] The condensation tank gas collection port 10 is connected to the gas extraction port 20 of the condenser 2. The first pipe orifice 111 of the condensation pipe 11 is connected to the liquid extraction port 21 of the condenser 2. The liquid extraction port 21 is arranged in the liquid refrigerant layer of the condenser 2. The second pipe orifice 112 of the condensation pipe 11 and the refrigerant return port 12 are respectively connected to the liquid refrigerant recovery unit 3, and the condensation tank exhaust port 13 is connected to the non-condensable gas discharge unit 4;

[0053] The condensation tank gas collection port 10 is used to collect the mixed gas in the condenser 2, and the mixed gas includes gaseous refrigerant and non-condensable gas;

[0054] The condensation pipe 11 is used to condense the gaseous refrigerant in the condensation tank 1 into liquid refrigerant, so as to separate the gaseous refrigerant and non-condensable gas in the condensation tank 1;

[0055] The refrigerant return port 12 is used to export the liquid refrigerant deposited at the bottom of the condensation tank 1 to the liquid refrigerant recovery unit 3;

[0056] The condensation tank exhaust port 13 is used to export the separated non-condensable gas to the non-condensable gas discharge unit 4.

[0057] Among them, the condensation tank 1 includes but is not limited to Figure 1 the shape shown, and can be a cuboid, a cube, a cylinder, etc. The specific shape can be designed based on factors such as the installation space and maintenance convenience, so that the condensation tank 1 has a certain volume, and the condensation pipe 11 can be installed through the shell of the condensation tank 1. The gas collection port 10, the refrigerant return port 12, the exhaust port 13 of the condensation tank, and the first pipeline 111 and the second pipeline 112 of the condensation pipe 11 all have good sealing performance and can be externally connected to pipelines for fluid transmission. The first pipeline 111 and the second pipeline 112 of the condensation pipe 11 both penetrate the outer shell of the condensation tank 1 (on the premise of not damaging the sealing performance of the condensation tank 1) to enable the condensation pipe 11 to transmit liquid refrigerant to the outside.

[0058] Among them, the condenser 2 is an important component in the water chiller. It can refrigerate through the refrigerant. The refrigerant, that is, the refrigerant, is a substance that can continuously circulate in the refrigeration equipment and achieve refrigeration through its own state change. The refrigerant in the condenser 2 can be divided into three layers. The top layer is the gaseous refrigerant layer, the middle layer is the gas-liquid mixed refrigerant layer, and the bottom layer is the liquid refrigerant layer. After the non-condensable gas enters the condenser 2, the non-condensable gas will gather in the gaseous refrigerant layer and mix with the gaseous refrigerant in the gaseous refrigerant layer to form a mixed gas, which affects the operation effect of the condenser 2. The liquid refrigerant recovery unit 3 can recover the liquid refrigerant deposited at the bottom of the condensation tank 1 through the refrigerant return port 12, and can also recover the liquid refrigerant in the condensation pipe 11 through the second pipe orifice 112 of the condensation pipe 11 to improve the utilization rate of the refrigerant. The non-condensable gas discharge unit 4 can export the non-condensable gas separated from the condensation tank 1 through the exhaust port 13 of the condensation tank and discharge the non-condensable gas.

[0059] Specifically, in this embodiment, an air intake port 20 is provided at the top of the condenser 2, so that the gas collection port 10 of the condensate tank is communicated with the gaseous refrigerant layer at the top of the condenser 2 through the air intake port 20, enabling the mixed gas accumulated in the gaseous refrigerant layer to flow into the condensate tank 1, so that the condensing pipe 11 in the condensate tank 1 can condense and liquefy the gaseous refrigerant in the mixed gas. A liquid intake port 21 is provided on the side wall of the liquid refrigerant layer of the condenser 2, and the first pipe orifice 111 of the condensing pipe 11 is communicated with the liquid intake port 21 of the condenser 2, so that the liquid refrigerant in the condenser 2 can be conveniently introduced into the condensing pipe 11 as the refrigerant of the condensing pipe 11, without the need to additionally consume costs to introduce a refrigerant into the condensing pipe 11 in the condensate tank 1. This structure for introducing a refrigerant into the condensing pipe 11 is simple and effective. Further, in this embodiment, the refrigerant return port 12 of the condensate tank 1 and the second pipe orifice 112 of the condensing pipe 11 are both connected to the liquid refrigerant recovery unit 3, and the recovery and utilization of the refrigerant can be realized through the liquid refrigerant recovery unit 3. For example, the recovered refrigerant can be re-injected into the condenser 2 or used for other purposes. In this embodiment, the non-condensable gas that is not liquefied and separated in the condensate tank 1 can also be discharged to the non-condensable gas discharge unit 4 through the condensate tank exhaust port 13, achieving the removal of the non-condensable gas.

[0060] The above-mentioned condensate tank 1 includes a condensate tank gas collection port 10, a condensing pipe 11, a refrigerant return port 12, and a condensate tank exhaust port 13. The condensate tank gas collection port 10 is connected to the air intake port 20 of the condenser 2, enabling the condensate tank 1 to collect the mixed gas (including gaseous refrigerant and non-condensable gas) in the condenser 2 through the condensate tank gas collection port 10. Further, the first pipe orifice 111 of the condensing pipe 11 is connected to the liquid intake port 21 of the condenser 2, and the liquid intake port 21 is provided in the liquid refrigerant layer of the condenser 2, enabling the condensing pipe 11 to introduce the liquid refrigerant in the condenser 2 as a refrigerant, thereby condensing the gaseous refrigerant in the condensate tank 1 into a liquid refrigerant and separating the gaseous refrigerant and non-condensable gas in the condensate tank 1. The second pipe orifice 111 and the refrigerant return port 12 are respectively connected to the liquid refrigerant recovery unit 3, enabling the liquid refrigerant recovery unit 3 to recover the liquid refrigerant in the condensing pipe 11 through the second pipe orifice 112 and recover the liquid refrigerant deposited at the bottom of the condensate tank 1 after condensation through the refrigerant return port 12. Further still, the condensate tank exhaust port 13 is connected to the non-condensable gas discharge unit 4, enabling the non-condensable gas discharge unit 4 to discharge the non-condensable gas separated in the condensate tank 1 through the condensate tank exhaust port 13, and then discharging the non-condensable gas. By adopting the above-mentioned condensate tank 1, there is no need to additionally consume costs to introduce a refrigerant into the condensing pipe 11, and there is no need to go through multiple process flows. The mixed gas collected from the condenser 2 can be conveniently and efficiently separated through the condensing pipe 11. The liquid refrigerant in the condensing pipe 11 and the liquid refrigerant obtained by condensation and separation can also be recovered, and the separated non-condensable gas can be discharged, capable of realizing the separation of the mixed gas in the condenser 2 at low cost and high efficiency and purifying the refrigerant in the gaseous refrigerant layer of the condenser 2.

[0061] In one embodiment, based on the application environment shown, as Figure 1 shown, the gas collection port 10 of the condensate tank is connected to the gas intake port 20 of the condenser 2 through the first solenoid valve 5 to connect to the gaseous refrigerant layer at the top of the condenser 2, and a mixed gas is accumulated in the gaseous refrigerant layer. Figure 2

[0062] Among them, the solenoid valve is an automatic component that can control the on / off of the pipeline through electromagnetic force.

[0063] Exemplarily, when the first solenoid valve 5 is turned on, the mixed gas in the gaseous refrigerant layer at the top of the condenser 2 can flow out along the pipeline from the gas intake port 20, pass through the first solenoid valve 5, and flow to the gas collection port 10 of the condensate tank 1, thereby flowing into the condensate tank 1.

[0064] It should be noted that in the scenario where the air pressure in the gaseous refrigerant layer of the condenser 2 is too high, the first solenoid valve 5 can also be opened to conveniently and quickly release the gas (which can be a mixed gas or only gaseous refrigerant) in the gaseous refrigerant layer to the condensate tank 1 to unload the condenser 2 and avoid excessive air pressure in the gaseous refrigerant layer of the condenser 2. That is, the condensate tank 1 can serve both the dual functions of purifying the refrigerant in the condenser 2 and unloading the condenser 2, and both the purification function and the unloading function can be achieved by controlling the conduction of the first solenoid valve 5.

[0065] In this embodiment, the conduction of the first solenoid valve 5 can be controlled to achieve the purification or unloading of the refrigerant in the gaseous refrigerant layer of the condenser 2, which is beneficial to improving the refrigeration effect of the refrigeration equipment and ensuring the operation performance and operation safety of the refrigeration equipment.

[0066] In a possible implementation, based on the application environment of the condensate tank shown, as Figure 2 shown, the first pipe orifice 111 of the condensate pipe 11 can be connected to the second solenoid valve 7 through the expansion valve 6, and the second solenoid valve 7 is connected to the liquid intake port 21 of the condenser 2, or, as Figure 3 shown, the first pipe orifice 111 of the condenser 11 is connected to the expansion valve 6 through the second solenoid valve 7, and the expansion valve 6 is connected to the liquid intake port 21 of the condenser 2. Figure 4

[0067] Among them, the expansion valve 6 has the functions of throttling and pressure reducing and regulating the flow rate, and can control the flow rate of the liquid refrigerant (refrigerant) by changing the cross-sectional area of the channel.

[0068] ​​Exemplarily, when the second solenoid valve 7 is in the conducting state, the liquid refrigerant in the condenser 2 can flow out from the liquid taking port 21 of the condenser 2, pass through the expansion valve 6 and the second solenoid valve 7, and flow into the first pipe orifice 111 of the condensation pipe 11, without the need to additionally introduce other refrigerants into the condensation pipe 11. When the second solenoid valve 7 is in the closed state, the liquid refrigerant in the condenser 2 will not be able to flow into the condensation pipe 11.

[0069] In this embodiment, whether to inject liquid refrigerant into the condensation pipe 11 can be controlled through the expansion valve 6 and the second solenoid valve 7, enabling the secondary utilization of the refrigerant in the condenser 2, thereby separating the mixed gas by using the condensation pipe 11 filled with liquid refrigerant at low cost and efficiently.

[0070] In some embodiments, as Figure 5 shown, on the basis of the condensation tank 1 as Figure 1 shown, a schematic structural diagram of a condensation tank including a partition is provided, wherein the condensation tank 1 further includes:

[0071] A housing 14, with a refrigerant return port 12 provided at the bottom of the housing 14;

[0072] A partition 15, which divides the housing 14 into a first space and a second space with a bottom connection. The condensation tank gas collection port 10 is provided at the top of the first space, and the condensation tank exhaust port 13 is provided at the top of the second space;

[0073] The condensation pipe 11 passes through the partition 15, penetrating the first space and the second space; the gaseous refrigerant collected by the condensation tank gas collection port 10 is condensed by the condensation pipe 11 and deposited at the bottom of the housing 14; the non-condensable gas collected by the condensation tank gas collection port 10 passes through the first space and the second space and is led out from the condensation tank exhaust port 13.

[0074] Among them, the liquid refrigerant deposited at the bottom of the housing 14 can form Figure 5 the liquid collection area 16 as

[0075] Exemplarily, taking the condensation tank 1 as Figure 5 shown and applying it to Figure 4Taking the condenser application environment shown as an example, when a refrigerant purification instruction is received, the first solenoid valve 5 and the second solenoid valve 7 are both turned on, and the mixed gas at the top of the condenser 2 can flow through the pipeline, through the first solenoid valve 5, into the condenser gas collection port 10 of the condenser 1, and enter the area where the condenser tube 11 is located in the first space. In the process of passing through the first space, under the action of the condenser tube 11, at least a portion of the gaseous refrigerant in the mixed gas is cooled and liquefied, converted into liquid refrigerant, and deposited in the liquid collection area 16 at the bottom of the condenser 1. The non-condensable gas will not be cooled and liquefied (the state of the non-condensable gas itself is not easily affected by temperature). The non-condensable gas and a small amount of unliquefied gaseous refrigerant can pass through the first space and the space above the liquid collection area and enter the area where the condenser tube 11 is located in the second space. Furthermore, in the process of passing through the second space, under the action of the condenser 11, the remaining small amount of gaseous refrigerant is liquefied by the cold, converted into liquid refrigerant, and deposited in the liquid collecting area 16 at the bottom of the condenser tank 1, while the non-condensable gas can continue to pass through the second space and flow to the condenser exhaust port 13 set at the top of the second space, so that the non-condensable gas discharge unit 4 can guide the non-condensable gas separated in the condenser tank 1 through the condenser exhaust port 13, and then discharge the non-condensable gas, thereby realizing the purification of the refrigerant in the mixed gas (the purified refrigerant is liquid and deposited in the liquid collecting area 16 at the bottom of the condenser tank 1).

[0076] In this embodiment, the partition 15 can be used to separate the condensation tank 1 into two areas connected at the bottom, thereby increasing the flow time of the mixed gas in the condensation tank 1, increasing the condensation time of the condenser 11 on the gaseous refrigerant in the mixed gas, improving the condensation effect, ensuring that the gaseous refrigerant and non-condensable gas in the mixed gas can be effectively separated, and further ensuring the effective purification of the gaseous refrigerant in the mixed gas.

[0077] In one embodiment, Figure 5 As shown in the condensation tank 1, Figure 6 As shown, a schematic structural diagram of a condensation tank including a gas-liquid separation plate is provided, wherein the condensation tank 1 further includes:

[0078] The gas-liquid separation plate 17 is provided at the top of the second space and below the exhaust port 13 of the condenser, and is used to separate the non-condensable gas and the liquid refrigerant carried in the non-condensable gas.

[0079] Among them, the gas-liquid separation plate 17 can separate gas and liquid based on the differences in the physical properties of the fluid, such as gravity, inertia, etc. The gas-liquid separation plate 17 has the following common separation principles: (1) Gravity separation principle: By setting a diversion plate, the resistance of the gas flowing through the diversion plate is small, while the liquid will be intercepted by the diversion plate and accumulate on the plate wall, thereby realizing the separation of gas and liquid. (2) Inertial separation principle: Utilize the inertial difference between gas and liquid when changing the flow direction for separation. The gas can change the flow direction during the process of passing through the gas-liquid separation plate 17, while the liquid carried in the gas is not easy to change the flow direction due to its large inertia, and thus is separated from the gas under the action of inertia.

[0080] In this embodiment, the non-condensable gas flowing through the second space and reaching the exhaust port 13 of the condensation tank can be filtered through the gas-liquid separation plate 17, isolating the liquid refrigerant carried in the non-condensable gas, and the isolated liquid refrigerant can drip along the gas-liquid separation plate 17 and deposit in the liquid collection area 16 at the bottom of the condensation tank 1, improving the purification effect of the refrigerant in the mixed gas and increasing the refrigerant purification output.

[0081] In a possible implementation, based on Figure 6 the condensation tank 1 shown, as Figure 7 shown, a schematic structural diagram of a condensation tank including fins is provided. Among them, the condensation tank 1 further includes:

[0082] Fins 18, at least one fin 18 is provided in each of the first space and the second space.

[0083] Among them, the fins 18 can increase the heat transfer area, exchange heat with the gas in the condensation tank 1, improve the condensation effect of the condensation pipe 11, and ensure that the condensation pipe 11 effectively condenses and liquefies the gaseous refrigerant flowing through the condensation tank 1.

[0084] Exemplarily, a plurality of fins 18 can be arranged in parallel in each of the first space and the second space, and the arrangement direction of the fins 18 can be parallel to the gravity direction and is arranged to penetrate through the condensation pipe 11, so as to fully contact the gaseous refrigerant flowing through the first space and the second space and improve the condensation and liquefaction effect of the condensation pipe 11.

[0085] In this embodiment, by arranging the fins 18 in the first space and the second space, the condensation and liquefaction effect of the refrigerant in the mixed gas can be improved, and the refrigerant purification output can be increased.

[0086] The embodiment of the present application further provides a refrigerant purification system, as Figure 8 shown, including Figure 7 the condensation tank 1 shown, and Figure 4 the condenser 2 and the liquid refrigerant recovery unit 3 in the application environment of the condensation tank shown;

[0087] The top of the condenser 2 is provided with a return air port 22, and the return air port 22 is connected to the liquid refrigerant recovery unit 3. The liquid refrigerant recovery unit 3 is used to recover the liquid refrigerant exported from the refrigerant return port 12 of the condensation tank 1 and the liquid refrigerant in the condensing pipe 11 in the condensation tank 1, and convert the recovered liquid refrigerant into gaseous refrigerant, so that the converted gaseous refrigerant flows back to the return air port 22 and enters the gaseous refrigerant layer of the condenser 2.

[0088] Exemplarily, the liquid refrigerant recovery unit 3 can specifically be a unit with heating and evaporation functions, which can heat and evaporate the liquid refrigerant flowing out from the second pipe orifice 112 of the condensing pipe 11 and the liquid refrigerant flowing out from the refrigerant return port 12, so as to convert the recovered liquid refrigerant into gaseous refrigerant, and the gaseous refrigerant can flow back to the return air port 22 of the condenser 2 along the pipeline.

[0089] It should be noted that, as Figure 8 shown, a pipeline can also be provided between the liquid refrigerant recovery unit 3 and the liquid refrigerant layer in the condenser 2. Whether refrigerant purification is required or not, the liquid refrigerant recovery unit 3 can evaporate and vaporize the liquid refrigerant flowing in from the liquid refrigerant layer, and inject the vaporized gaseous refrigerant into the return air port 22 of the condenser 2 to drive the recycling of the refrigerant in the condenser 2.

[0090] The above-mentioned refrigerant purification system includes a condensation tank 1, a condenser 2, and a liquid refrigerant recovery machine 3. The top of the condenser 2 is provided with a return air port 22, and the return air port 22 is connected to the liquid refrigerant recovery unit 3. The liquid refrigerant recovery unit 3 is used to recover the liquid refrigerant exported from the refrigerant return port 12 of the condensation tank 1 and the liquid refrigerant in the condensing pipe 11 in the condensation tank 1, and convert the recovered liquid refrigerant into gaseous refrigerant, so that the converted gaseous refrigerant flows back to the return air port 22 and enters the gaseous refrigerant layer of the condenser 2. By adopting the above-mentioned refrigerant purification system, there is no need to consume additional cost to introduce refrigerant into the condensing pipe 11 in the condensation tank 1, and there is no need for multiple process flows. The mixed gas collected from the condenser 2 can be conveniently and efficiently separated through the condensing pipe 11, and the liquid refrigerant in the condensing pipe 11 and the liquid refrigerant obtained by condensation and liquefaction separation can also be recovered. It can realize the separation of the mixed gas in the condenser 2 at low cost and high efficiency to purify the refrigerant in the gaseous refrigerant layer of the condenser 2.

[0091] In one embodiment, on the basis of the Figure 8 shown refrigerant purification system, as Figure 9 shown, the liquid refrigerant recovery unit 3 includes an evaporator 31;

[0092] The evaporator 31 is provided with a first liquid supply port 311, a second liquid supply port 312, and an evaporation port 313. The first liquid supply port 311 is connected to the refrigerant return port 12, the second liquid supply port 312 is connected to the second pipe orifice 112 of the condensing pipe 11, and the evaporation port 313 is connected to the return air port 22.

[0093] Among them, the evaporator 31 is a device that can convert a liquid substance into a gaseous substance.

[0094] Exemplarily, in this embodiment, the interior of the evaporator 31 may include a heating chamber ( Figure 9 not shown in the figure) and an evaporation chamber ( Figure 9 not shown in the figure). The heating chamber can provide the heat required for evaporation to the liquid refrigerant flowing into the evaporator 31, causing the liquid refrigerant to boil and vaporize, while the evaporation chamber can completely separate the gas-liquid two-phase. That is, the liquid refrigerant can enter the heating chamber in the evaporator 31 through the first liquid supply port 311, the second liquid supply port 312, and the pipeline between the liquid refrigerant layer and the evaporation chamber. The heating chamber is communicated with the evaporation chamber, and the vaporized gaseous refrigerant can enter the evaporation chamber and flow into the pipeline from the evaporation port 313 communicated with the evaporation chamber, so as to flow to the return air port 22, and then be injected into the gaseous refrigerant layer of the condenser 2 to realize the recycling of the refrigerant.

[0095] In this embodiment, the evaporator 31 in the liquid refrigerant recovery unit 3 can be used to realize the recycling of the refrigerant in the condenser 2, so as to realize the purification of the refrigerant in the condenser 2 at low cost.

[0096] In some embodiments, on the basis of the Figure 9 shown refrigerant purification system, as Figure 10 shown, the liquid refrigerant recovery unit 3 may further include a compressor 32, and the compressor 32 is arranged between the evaporation port 313 and the return air port 22.

[0097] Among them, the compressor 32 is a device that can lift a low-pressure gas to a high-pressure gas. The piston in the compressor 32 can be driven by an electric motor to compress the gas entering the compressor 32 and then discharge the high-pressure gas.

[0098] Exemplarily, as Figure 10 shown, the evaporation port 313 can be connected to the compressor intake port 321 of the compressor 32, and the compressor exhaust pipe 322 of the compressor 32 can be connected to the return air port 22. That is, the compressor 32 can compress the gaseous refrigerant that evaporates and flows out from the evaporation port 313 and flows into the compressor intake port 321, and discharge the high-pressure gaseous refrigerant through the compressor exhaust pipe 322, providing power for the recycling of the refrigerant, so that the recycled and converted gaseous refrigerant can be smoothly injected into the return air port 22 of the condenser 2 under the action of the pressure difference.

[0099] In this embodiment, the compressor 32 can provide power for the process of refrigerant circulating flow to ensure the smooth progress of the refrigerant purification and recycling process.

[0100] In an exemplary embodiment, based on Figure 10 the refrigerant purification system shown, as Figure 11 shown, the refrigerant purification system further includes a non-condensable gas discharge unit 4, and the non-condensable gas discharge unit 4 is used to discharge the non-condensable gas led out from the condensate tank exhaust port 13 of the condensate tank 1.

[0101] Exemplarily, the non-condensable gas discharge unit 4 can extract the gas and discharge the extracted gas to the outside, and can also have the function of temporarily storing a part of the gas. In this embodiment, the non-condensable gas discharge unit 4 can lead out the non-condensable gas accumulated at the condensate tank exhaust port 13 through the condensate tank exhaust port 13, and can also temporarily store a part of the extracted non-condensable gas. When the discharge condition is reached, the stored non-condensable gas can be discharged to the outside.

[0102] In this embodiment, the non-condensable gas separated from the mixed gas can be discharged through the non-condensable gas discharge unit 4 to avoid the interference of the non-condensable gas on the operation process of the condenser 2.

[0103] In one of the embodiments, based on Figure 11 the refrigerant purification system shown, as Figure 12 shown, the non-condensable gas discharge unit 4 includes a gas tank 41 and a vacuum pump 42, wherein:

[0104] The gas tank 41 includes a gas tank gas collection port 411 and a gas tank exhaust port 412. The gas tank gas collection port 411 is connected to the condensate tank exhaust port 13 of the condensate tank 1 through a third solenoid valve 43, and the gas tank exhaust port 412 is connected to the vacuum pump 42 through a fourth solenoid valve 44.

[0105] Among them, the gas tank 41 has a certain volume and can be used to store the non-condensable gas led out from the condensate tank exhaust port 13. The vacuum pump 42 can evacuate the container to be evacuated (i.e., the gas tank 41) and discharge the gas extracted from the gas tank 41 to the outside.

[0106] Exemplarily, as Figure 11As shown, the fourth solenoid valve 44 can be connected to the evacuation pump 42 through the evacuation pump intake port 421 of the evacuation pump 42, and the evacuation pump exhaust port 422 of the evacuation pump 42 is connected to the outside. When the third solenoid valve 43 is in the conducting state, the non-condensable gas accumulated at the condensate tank exhaust port 13 can enter the gas tank 41; when the third solenoid valve 43 is closed (non-conducting), the non-condensable gas accumulated at the condensate tank exhaust port 13 cannot enter the gas tank 41. If the fourth solenoid valve 44 is conducting and the evacuation pump 42 is in the working state, the evacuation pump 42 can extract and discharge the non-condensable gas stored in the gas tank 41 to the outside; if the fourth solenoid valve 44 is closed (non-conducting), the evacuation pump 42 cannot extract the non-condensable gas stored in the gas tank 41.

[0107] In this embodiment, the non-condensable gas can be discharged by means of the gas tank 41 and the evacuation pump 42 in the non-condensable gas discharge unit 4, thereby realizing the discharge of the non-condensable gas.

[0108] In one embodiment, based on the Figure 12 refrigerant purification system shown, as Figure 13 shown, the gas tank 41 further includes a pressure sensor 413, and the pressure sensor 413 is used to detect the air pressure inside the gas tank 41;

[0109] When the air pressure inside the gas tank 41 rises to the first air pressure threshold value, the third solenoid valve 43 closes, the fourth solenoid valve 44 conducts, and the evacuation pump 42 starts to operate;

[0110] When the air pressure inside the gas tank 41 drops to the second air pressure threshold value, the third solenoid valve 43 conducts, the fourth solenoid valve 44 closes, and the evacuation pump 42 stops operating.

[0111] Among them, the first air pressure threshold value is greater than the second air pressure threshold value, and both the first air pressure threshold value and the second air pressure threshold value can be flexibly configured based on the actual application scenario. The pressure sensor 413 can detect a pressure signal (such as the air pressure inside the gas tank 41), and can convert the pressure signal into an available output electrical signal according to a certain rule, so that the controller of the refrigerant purification system can control the conducting states of the third solenoid valve 43 and the fourth solenoid valve 44, as well as control the working state of the evacuation pump 42 based on the electrical signal fed back by the pressure sensor.

[0112] It should be noted that the gas volume of the condensate tank 1 can ensure that during the process of waiting for the evacuation pump 42 to start operating again, the air pressure of the gas inside the condensate tank 1 will not affect the operation of the components inside the condensate tank 1. That is, in this embodiment, when designing the size of the condensate tank 1, it will be ensured that the gas volume of the condensate tank 1 is greater than the amount of gas entering the condensate tank 1 during the process of the evacuation pump 42 stopping operating.

[0113] In this embodiment, the process of discharging non-condensable gases can be fully automatically controlled by the pressure sensor 413, and the non-condensable gases in the condenser 2 can be discharged efficiently and conveniently.

[0114] An embodiment of the present application also provides a refrigerant purification method, which can be applied to a refrigerant purification system as shown in Figure 13 and is executed by the controller in the refrigerant purification system. The controller can specifically be the main control chip (MCU) of the refrigerant purification system, and can automatically control the operation of each component in the refrigerant purification system according to the received instructions. Among them, there are various types of instructions received by the controller, which can be remotely triggered by the user using a terminal device, or triggered by the user pressing a touch screen / button, or triggered by a pressure sensor in the refrigerant purification system. The refrigerant purification method specifically includes the following processes:

[0115] (1) When the controller receives a refrigerant purification instruction, the controller can control the first solenoid valve 5 between the gas intake port 20 of the condenser 2 and the condensate tank gas collection port 10 of the condensate tank 1 to conduct, so that the mixed gas in the condenser 2 flows from the gas intake port 20 of the condenser 2 into the condensate tank gas collection port 10 of the condensate tank 1. At the same time, the controller can also control the second solenoid valve 7 between the liquid intake port 21 of the condenser 2 and the first pipe orifice 111 of the condensate pipe 11 to conduct, so that the liquid refrigerant in the condenser 2 can flow out from the liquid intake port 21, pass through the expansion valve 6 and the second solenoid valve 7, and be injected into the first pipe orifice 111 of the condensate pipe 11 in the condensate tank 1. Based on this, the refrigerant is injected into the condensate pipe 11, so that the condensate pipe 11 can refrigerate, and the gaseous refrigerant in the mixed gas collected in the condensate tank 1 is condensed into liquid refrigerant to separate the non-condensable gases in the mixed gas.

[0116] (2) When the controller receives a refrigerant purification instruction, the controller can synchronously control the liquid refrigerant recovery unit 3 to convert the liquid refrigerant recovered from the refrigerant return port 12 of the condensate tank 1 and the second pipe orifice 112 of the condensate pipe 11 into gaseous refrigerant, and inject the converted gaseous refrigerant into the return air port 22 of the condenser 2. It should be noted that for the liquid refrigerant flowing into the liquid refrigerant recovery unit 3 from the pipeline between the liquid refrigerant layer and the liquid refrigerant recovery unit 3, when the liquid refrigerant recovery unit 3 is operating, it can also evaporate it and inject it into the return air port 22 of the condenser 2.

[0117] That is, control the evaporator 31 and the compressor 32 in the liquid refrigerant recovery unit 3 to start running, so that the evaporator 31 can convert the liquid refrigerant recovered from the refrigerant return port 12 and the second pipe orifice 112 of the condensate tank 1, and the liquid refrigerant flowing into the pipeline between the liquid refrigerant layer and the evaporator 31 into gaseous refrigerant, and the compressor 32 can compress the converted gaseous refrigerant and inject the compressed gaseous refrigerant into the return air port 22 of the condenser 2.

[0118] (3) When the controller receives the refrigerant purification instruction, the controller can control the non-condensable gas discharge unit 4 to start operating, so as to discharge the non-condensable gas led out from the condensate tank exhaust port 13 of the condensate tank 1 through the non-condensable gas discharge unit 4.

[0119] That is, the controller monitors the pressure in the gas tank 41 based on the pressure sensor 413 provided in the gas tank 41. If the air pressure in the gas tank 41 does not reach the first air pressure threshold value, the controller can control the third solenoid valve 43 to conduct, while the fourth solenoid valve 44 is closed, and the evacuation pump 42 does not operate, so that the non-condensable gas separated from the condensate tank 1 is led out from the condensate tank exhaust port 13 of the condensate tank 1 to the gas tank 41. If the air pressure in the gas tank 41 reaches the first air pressure threshold value, the controller can control the third solenoid valve 43 to close, while the fourth solenoid valve 44 conducts, and the evacuation pump 42 operates, so as to stop leading the non-condensable gas to the gas tank 41, and control the evacuation pump 42 to discharge the non-condensable gas in the gas tank 41 until the air pressure in the gas tank 41 drops to the second air pressure threshold value, and then control the third solenoid valve 43 to conduct, while the fourth solenoid valve 44 is closed, and the evacuation pump 42 does not operate, so as to stop discharging the non-condensable gas in the gas tank 41, and control the non-condensable gas separated from the condensate tank 1 to be led out from the condensate tank exhaust port 13 to the gas tank 41.

[0120] In this embodiment, Figure 13 the shown refrigerant purification system can work in a cycle according to the above control process, so as to effectively discharge the non-condensable gas from the refrigeration equipment continuously, ensure the heat exchange efficiency of the refrigeration equipment, and improve the operation performance of the refrigeration equipment.

[0121] In this embodiment, the process of discharging the non-condensable gas can be automatically and flexibly controlled according to the pressure in the gas tank 41, which can simply and effectively improve the operation effect of the condenser 2.

[0122] It should be noted that the refrigerant purification process is generally set within a working time period. After receiving the refrigerant purification instruction, the controller can control the cyclic progress of the refrigerant purification process and the non-condensable gas discharge process within this working time period. When not in the working time period of refrigerant purification, the controller can control the first solenoid valve 5, the second solenoid valve 7, the third solenoid valve 43, and the fourth solenoid valve 44 to be closed, and control the evacuation pump 422 to stop operating, and can only control the evaporator 31 and the compressor 32 to operate to realize the recycling of the refrigerant, that is, control the evaporator 31 to heat and evaporate the liquid refrigerant flowing into the evaporator 31 from the liquid refrigerant layer, and then inject the vaporized high-pressure gaseous refrigerant into the gaseous refrigerant layer of the condenser 2 through the compressor 32 to realize the recycling of the refrigerant in the condenser 2.

[0123] It should be noted that the information and data involved in this application (including but not limited to the data for analysis, stored data, displayed data, etc.) are all information and data fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with the relevant laws, regulations, and standards of relevant countries and regions.

[0124] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered that the scope described in this specification.

[0125] The above embodiments only represent several implementation manners of this application, and their descriptions are relatively specific and detailed. However, it should not be understood as a limitation to the patent scope of this application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of this application should be subject to the appended claims.

Claims

1. A condensation tank, characterized in that, The condensation tank includes a condensation tank gas collection port, a condensation pipe, a refrigerant return port, and a condensation tank exhaust port; The condensation tank gas collection port is connected to the gas extraction port of the condenser. The first pipe orifice of the condensation pipe is connected to the liquid extraction port of the condenser. The liquid extraction port is arranged in the liquid refrigerant layer of the condenser. The second pipe orifice of the condensation pipe and the refrigerant return port are respectively connected to the liquid refrigerant recovery unit, and the condensation tank exhaust port is connected to the non-condensable gas discharge unit.

2. The condensate tank according to claim 1, characterized in that, The condensation tank gas collection port is connected to the gas extraction port of the condenser through a first solenoid valve to connect to the gaseous refrigerant layer at the top of the condenser, and a mixed gas is gathered in the gaseous refrigerant layer.

3. The condensate tank according to claim 1, characterized in that, The first pipe orifice of the condensation pipe is connected to the liquid extraction port of the condenser through an expansion valve and a second solenoid valve.

4. The condensation tank according to claim 1, wherein, The condensation tank further includes: A housing, and the refrigerant return port is arranged at the bottom of the housing; A partition plate that divides the housing into a first space and a second space with a bottom connection. The condensation tank gas collection port is arranged at the top of the first space, and the condensation tank exhaust port is arranged at the top of the second space; The condensation pipe passes through the partition plate and penetrates through the first space and the second space; the gaseous refrigerant collected by the condensation tank gas collection port is condensed by the condensation pipe and deposited at the bottom of the housing; the non-condensable gas collected by the condensation tank gas collection port passes through the first space and the second space and is then led out from the condensation tank exhaust port.

5. The condensate tank according to claim 4, characterized in that, The condensation tank further includes: A gas-liquid separation plate arranged at the top of the second space and below the condensation tank exhaust port for separating the non-condensable gas and the liquid refrigerant carried in the non-condensable gas.

6. The condensate tank according to claim 4, characterized in that, The condensation tank further includes: Fins, and at least one fin is respectively arranged in the first space and the second space.

7. A refrigerant purification system, characterized in that, Including a condenser, a liquid refrigerant recovery unit, and the condensation tank according to any one of claims 1 to 6; A return air port is arranged at the top of the condenser, and the return air port is connected to the liquid refrigerant recovery unit. The liquid refrigerant recovery unit is used to recover the liquid refrigerant led out from the refrigerant return port of the condensation tank and the liquid refrigerant in the condensation pipe of the condensation tank, and convert the recovered liquid refrigerant into gaseous refrigerant, so that the converted gaseous refrigerant flows back to the return air port and enters the gaseous refrigerant layer of the condenser.

8. The refrigerant purification system according to claim 7, characterized in that, The liquid refrigerant recovery unit includes an evaporator; The evaporator is provided with a first liquid supply port, a second liquid supply port, and an evaporation port. The first liquid supply port is connected to the refrigerant return port, the second liquid supply port is connected to the second pipe orifice of the condensation pipe, and the evaporation port is connected to the return air port.

9. The refrigerant purification system according to claim 8, wherein, The liquid refrigerant recovery unit further includes a compressor, and the compressor is arranged between the evaporation port and the return air port.

10. The refrigerant purification system according to claim 7, characterized in that, The refrigerant purification system further includes a non-condensable gas discharge unit for discharging the non-condensable gas led out from the condensation tank exhaust port of the condensation tank.

11. The refrigerant purification system according to claim 10, wherein The non-condensable gas discharge unit includes a gas tank and a vacuum pump; The gas tank includes a gas tank gas collection port and a gas tank exhaust port. The gas tank gas collection port is connected to the condensate tank exhaust port of the condensate tank through a third solenoid valve, and the gas tank exhaust port is connected to the evacuation pump through a fourth solenoid valve.

12. The refrigerant purification system according to claim 11, wherein The gas tank further includes a pressure sensor for detecting the air pressure inside the gas tank; When the air pressure inside the gas tank rises to the first air pressure threshold, the third solenoid valve closes, the fourth solenoid valve conducts, and the evacuation pump starts to operate; When the air pressure inside the gas tank drops to the second air pressure threshold, the third solenoid valve conducts, the fourth solenoid valve closes, and the evacuation pump stops operating.

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