Expansion device
By setting back fluid holes in the liquid accumulation tank and air outlet pipe of the expansion device, and using heat exchange gas to bring out the liquid, the problem of excessive liquid volume in the double-stage composite refrigeration system is solved, ensuring the stable operation and lubrication of the compressor Oil recycling.
Patent Information
- Application Number
- CN202420884810.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-26
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-04-26
AI Technical Summary
In a double-stage composite refrigeration system, the gasification of the refrigerant during the unit shutdown causes too high pressure in the system. The existing expansion tube cannot effectively solve the problem of excessive liquid entering the compressor instantaneously, affecting the stable operation of the compressor.
Design an expansion device, including a fluid accumulation tank and an outlet pipe in the tank body, and a return liquid hole is installed in the outlet pipe. The liquid only enters the outlet pipe through the return liquid hole when the liquid level is flush with the return liquid hole, and passes through the heat exchange gas belt Liquid is discharged and the instantaneous return volume is reduced.
It effectively reduces the instantaneous liquid return volume of the compressor, ensures the stable operation of the compressor, and realizes timely return and recycling of lubricating oil through gas-liquid separation.
Smart Images
Figure CN222210855U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of compressor liquid return, in particular to an expansion device. Background Art
[0002] In a two-stage cascade refrigeration system, the refrigerant in the low-temperature refrigeration system is R23, which is in gaseous state at room temperature. Therefore, when the unit is shut down, the refrigerant in the refrigeration system will all be vaporized, causing excessive pressure in the system and causing the safety valve to release pressure. To address this problem, the prior art generally uses an expansion tube between the evaporator and the compressor, which can accommodate the vaporized refrigerant when the unit is shut down. But the problem that immediately arises is that the return air temperature entering the compressor will be too low, which will lead to the problem of excessive amount of liquid entering the compressor instantaneously. However, the existing expansion tank can only effectively accommodate refrigerant gas when the unit is shut down, and cannot improve the problem of excessive amount of liquid entering the compressor instantaneously.
[0003] Therefore, there is an urgent need for an expansion device that can solve the problem of excessive amount of liquid entering the compressor instantaneously, thereby ensuring the stable operation of the compressor. Utility Model Content
[0004] The purpose of the utility model is to provide an expansion device.
[0005] To achieve this purpose, the utility model adopts the following technical solutions:
[0006] An expansion device, used to reduce the instantaneous liquid return amount of a compressor, comprises:
[0007] A tank body, wherein a cavity is formed inside, a tank wall of the tank body is provided with a liquid collection groove, and the liquid collection groove is connected to the cavity, and the liquid collection groove can accommodate the liquid in the cavity;
[0008] An air intake mechanism, one end of which is connected to the cavity and the other end of which is capable of introducing heat exchange gas into the cavity;
[0009] An outlet pipe, a first end of which passes through the liquid accumulation tank and is connected to the cavity, and a second end of which is connected to the compressor, so that the heat exchange gas can enter the compressor; a side wall of the outlet pipe located in the liquid accumulation tank is provided with a liquid return hole, and when the liquid level in the liquid accumulation tank is flush with the liquid return hole, the liquid can enter the outlet pipe through the liquid return hole, so that the liquid can be carried out by the heat exchange gas.
[0010] Preferably, a plurality of the liquid return holes are arranged at intervals along the vertical direction, and the plurality of liquid return holes are arranged in a straight line.
[0011] Preferably, the diameters of the plurality of liquid return holes gradually increase in a direction approaching the cavity.
[0012] Preferably, the first end is higher in vertical direction than the top of the liquid collection tank.
[0013] Preferably, the first end and the second end are connected via a U-shaped tube, and the liquid can be stored in the U-shaped tube.
[0014] Preferably, the air intake mechanism comprises an air intake pipe and a first auxiliary pipe, and the air intake pipe and the first auxiliary pipe are arranged on the tank wall of the tank body away from the air outlet pipe along the axial direction of the tank body;
[0015] The air inlet pipe can pass high-temperature gas into the cavity, and the first auxiliary pipe can pass low-temperature gas-liquid two-phase fluid into the cavity. The high-temperature gas and the low-temperature gas-liquid two-phase fluid can form the heat exchange gas in the cavity.
[0016] Preferably, one end of the air inlet pipe and the first auxiliary pipe respectively connected to the tank body are tangent to the tank wall and connected to the cavity.
[0017] Preferably, the air intake mechanism also includes a second auxiliary pipe, which is arranged on the tank wall of the tank body. One end of the second auxiliary pipe is connected to the cavity, and the other end can introduce the high-temperature gas into the cavity when the amount of high-temperature gas introduced into the air intake pipe is reduced, so as to maintain the preset temperature and preset pressure of the heat exchange gas.
[0018] Preferably, one end of the second auxiliary pipe connected to the tank body is tangent to the tank wall and communicates with the cavity.
[0019] Preferably, the air intake pipe, the first auxiliary pipe and the second auxiliary pipe are spaced apart along the axial direction of the tank body.
[0020] Beneficial effects of the utility model:
[0021] The expansion device is provided with a liquid accumulation groove on the bottom side wall of the tank body, and the liquid accumulation groove can accommodate the liquid in the tank body. The air outlet pipe passes through the liquid accumulation groove and is connected to the cavity. The heat exchange gas can not only be discharged through the air outlet pipe, but also because the part of the air outlet pipe located in the liquid accumulation groove is provided with a return liquid hole, when the liquid level height in the liquid accumulation groove is parallel to the liquid level of the return liquid hole, the liquid in the groove can enter the air outlet pipe through the return liquid hole and be carried out by the heat exchange gas, so that the liquid will not directly enter the air outlet pipe through the first end of the air outlet pipe connected to the cavity, thereby reducing the amount of liquid in the air outlet pipe, and then can reduce the instantaneous liquid return amount of the compressor, to ensure the normal operation of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is an axonometric view of the expansion device provided by the utility model;
[0023] Figure 2 It is a front view of the expansion device provided by the utility model;
[0024] Figure 3 It is a cross-sectional view of the expansion device provided by the utility model.
[0025] In the figure:
[0026] 10. Tank body; 11. Liquid storage tank;
[0027] 20. air intake mechanism; 21. air intake pipe; 22. first auxiliary pipe; 23. second auxiliary pipe;
[0028] 30. Air outlet pipe; 31. First end; 32. Second end; 33. Liquid return hole; 34. U-shaped tube. DETAILED DESCRIPTION
[0029] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.
[0030] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0031] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0032] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.
[0033] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.
[0034] like Figure 1-Figure 3 As shown, this embodiment provides an expansion device, which is arranged between the evaporator and the compressor, and is used to reduce the instantaneous liquid return amount of the compressor. The device includes a tank body 10, an air intake mechanism 20 and an air outlet pipe 30. Among them, a cavity is formed inside the tank body 10, and a liquid accumulation groove 11 is arranged on the tank wall of the tank body 10. The liquid accumulation groove 11 is connected to the cavity, and the liquid accumulation groove 11 can accommodate the liquid in the cavity; one end of the air intake mechanism 20 is connected to the cavity, and the other end is connected to the evaporator, and heat exchange gas can be introduced into the cavity at the same time; the first end 31 of the air outlet pipe 30 passes through the liquid accumulation groove 11 and is connected to the cavity, and the second end 32 is connected to the compressor, so that the heat exchange gas can enter the compressor; the side wall of the air outlet pipe 30 located in the liquid accumulation groove 11 is provided with a liquid return hole 33. When the liquid level in the liquid accumulation groove 11 is flush with the liquid return hole 33, the liquid in the liquid accumulation groove 11 can enter the air outlet pipe 30 through the liquid return hole 33, so that the liquid can be taken out of the cavity by the heat exchange gas.
[0035] The expansion device is provided with a liquid accumulation groove 11 on the side wall of the tank body 10, and the liquid accumulation groove 11 can be used to accommodate the liquid in the tank body 10, and the air outlet pipe 30 passes through the liquid accumulation groove 11 and is connected to the cavity. The heat exchange gas can not only be discharged through the air outlet pipe 30, but also because the part of the air outlet pipe 30 located in the liquid accumulation groove 11 is provided with a return liquid hole 33, the liquid in the liquid accumulation groove 11 can enter the air outlet pipe 30 through the return liquid hole 33 only when the liquid level height is flush with the return liquid hole 33, and then be carried out of the cavity by the heat exchange gas, thereby ensuring that the liquid generated by the heat exchange gas will not directly enter the air outlet pipe 30 from the first end 31 of the air outlet pipe 30 connected to the cavity, thereby reducing the amount of liquid entering the air outlet pipe 30, and then can reduce the instantaneous return liquid amount of the compressor, thereby ensuring the normal operation of the compressor.
[0036] It is worth noting that, in this embodiment, Figure 2 and Figure 3As shown, the tank body 10 is placed horizontally. In order to collect the liquid generated by the heat exchange gas, a liquid collection tank 11 is provided on the bottom side wall of the tank body 10. The liquid in the cavity will flow to the bottom of the cavity under the action of gravity, and then the liquid will flow into the liquid collection tank 11 under the push of the heat exchange gas. In other embodiments, the liquid can also flow into the liquid collection tank 11 by tilting the tank body 10. As long as it can be ensured that the liquid in the cavity can be concentrated in the liquid collection tank 11 and gradually brought out from the outlet pipe 30 by the heat exchange gas, no other restrictions are made in this embodiment.
[0037] It is further explained that in this embodiment, the heat exchange gas is a heat exchange gas formed by mixing high-temperature gas and low-temperature gas-liquid two-phase fluid, wherein most of the low-temperature liquid is vaporized and participates in heat exchange, but a small part of the low-temperature liquid is not completely vaporized; in addition, due to long-term use, lubricating oil will accumulate in the cavity of the tank body 10, so the liquid in the liquid accumulation tank 11 in this embodiment includes both low-temperature liquid that does not participate in the reaction and lubricating oil. When the liquid level of the mixed liquid of low-temperature liquid and lubricating oil is flush with the return liquid hole 33, the mixed liquid of low-temperature liquid and lubricating oil enters the gas outlet pipe 30 and is brought into the compressor by the heat exchange gas. After entering the compressor, the lubricating oil will be separated into the compressor oil tank by the internal structure of the compressor and the action of gravity, and the low-temperature liquid can also be re-transmitted to the cavity to participate in heat exchange again, so as to achieve the purpose of recycling and reduce the cost of use. This process not only realizes the rapid vaporization of cryogenic liquid, but also separates the heat exchange gas from some unvaporized liquid and the lubricating oil generated during use, thereby achieving gas-liquid separation; in addition, the separated liquid will not be instantly transmitted back to the compressor, thereby ensuring that the compressor can always operate normally.
[0038] To ensure the liquid return effect, Figure 3 As shown, a plurality of liquid return holes 33 are arranged on the side wall of the air outlet pipe 30 at intervals in the vertical direction, and the plurality of liquid return holes 33 are arranged in a straight line in the vertical direction. By providing a plurality of liquid return holes 33, it can be ensured that too much cryogenic liquid and lubricating oil will not accumulate in the tank body 10, thereby ensuring that the inside of the tank body 10 can exchange heat normally, and the lubricating oil can be brought back to the compressor in time for full use; in addition, the plurality of liquid return holes 33 are arranged in the vertical direction to ensure that the liquid level in the liquid accumulation tank 11 can enter the air outlet pipe 30 at any height and be transmitted back to the compressor, thereby ensuring the liquid return effect.
[0039] To avoid excessive instantaneous liquid return, which may cause the compressor to fail to operate normally, Figure 3As shown, the apertures of the multiple liquid return holes 33 gradually increase in the direction close to the cavity. By making the apertures of the liquid return holes 33 change gradually in the vertical direction, and the aperture of the liquid return hole 33 at the bottom in the vertical direction is the smallest, the liquid in the cavity can first enter the outlet pipe 30 through the liquid return hole 33 at the bottom, and a large amount of liquid will not enter the outlet pipe 30 instantly; when the liquid in the liquid accumulation tank 11 gradually increases and the liquid level gradually rises, it will gradually enter the outlet pipe 30 through the multiple liquid return holes 33 with larger apertures, which will neither cause excessive accumulation of liquid inside the tank body 10 nor excessive amount of liquid entering the outlet pipe 30 instantly, thereby ensuring the normal use of the compressor.
[0040] In order to further ensure that a large amount of liquid does not enter the air outlet pipe 30 instantly, the height of the first end 31 of the air outlet pipe 30 in the vertical direction is higher than the top of the liquid accumulating tank 11. If the height of the first end 31 of the air outlet pipe 30 in the vertical direction is lower than the top of the liquid accumulating tank 11, when too much liquid accumulates in the liquid accumulating tank 11, the liquid will flow back into the air outlet pipe 30 from the first end 31 of the air outlet pipe 30, thereby causing too much liquid to instantly flow back into the compressor, thereby causing damage to the compressor. Setting the height of the first end 31 of the air outlet pipe 30 in the vertical direction to be higher than the top of the liquid accumulating tank 11 can solve this problem well.
[0041] like Figure 1-Figure 3 As shown, the first end 31 and the second end 32 of the outlet pipe 30 are connected through a U-shaped tube 34, and the liquid can be stored in the U-shaped tube 34. By setting the U-shaped tube 34, the liquid will not enter the compressor immediately after entering the outlet pipe 30 through the return hole 33, but will be stored in the bend of the U-shaped tube first. When there is a certain gap between the liquid level at the bend and the inner wall of the outlet pipe 30, the heat exchange gas can be continuously sent back to the compressor through this gap. At this time, the liquid at the bend will not be pressed into the compressor by the heat exchange gas. When the bend of the U-shaped tube 34 is full of liquid, the liquid at the bend can be squeezed into the compressor under the pressure of the heat exchange gas, and the lubricating oil entering the compressor is separated to the compressor oil tank for reuse, and the low-temperature liquid part can be re-transmitted back to the cavity and reused. By setting the U-shaped tube 34, it is ensured that there will be no continuous liquid entering the compressor to affect the normal operation of the compressor. Only when the U-shaped tube 34 is full of liquid, a mixture of part of the lubricating oil and the low-temperature liquid will enter the compressor, thereby ensuring that the compressor can be used normally.
[0042] It is worth noting that in this embodiment, the first end 31, the second end 32 and the U-shaped tube 34 are an integrally formed structure, which is convenient for production and processing. In other embodiments, the first end 31, the second end 32 and the U-shaped tube 34 can also be processed in sections according to actual needs, and finally connected by a clamping or threaded connection. As long as it can ensure that the liquid can be stored in the bend of the U-shaped tube 34, this embodiment does not make other restrictions.
[0043] like Figure 1-Figure 3 As shown, in order to further ensure the heat exchange effect, the air intake mechanism 20 includes an air intake pipe 21 and a first auxiliary pipe 22. The air intake pipe 21 and the first auxiliary pipe 22 are arranged on the tank wall of the tank body 10 away from the air outlet pipe 30 along the axial direction of the tank body 10; the air intake pipe 21 can pass high-temperature gas into the cavity, and the first auxiliary pipe 22 can pass low-temperature gas-liquid two-phase fluid into the cavity, and the high-temperature gas and the low-temperature gas-liquid two-phase fluid can form heat exchange gas in the cavity. By setting the air intake pipe 21 and the first auxiliary pipe 22, the high-temperature gas and the low-temperature gas-liquid two-phase fluid can be separately passed into the cavity, so that they enter the cavity for sufficient heat exchange, so that the low-temperature liquid can participate in the heat exchange to the greatest extent, thereby minimizing the low-temperature liquid remaining in the cavity, thereby reducing the amount of liquid entering the compressor. In addition, the air intake pipe 21 and the first auxiliary pipe 22 are arranged separately, which can also facilitate connection with other equipment, thereby ensuring a good use effect. It is worth noting that, in this embodiment, the air inlet pipe 21 is connected to the evaporator, and the evaporator can be introduced with high-temperature gas through the air inlet pipe 21; the low-temperature gas-liquid two-phase fluid can be a two-phase fluid composed of cooling water and cold air. As long as the heat exchange effect can be guaranteed, no other limitations are made in this embodiment.
[0044] In addition, if Figure 1-Figure 3 As shown, since the air inlet pipe 21 and the first auxiliary pipe 22 are arranged on the tank wall of the tank body 10 along the axial direction of the tank body 10 away from the air outlet pipe 30, this arrangement can ensure that after the high-temperature gas and the low-temperature gas-liquid two-phase fluid enter the cavity, they will first undergo sufficient heat exchange and flow along the axial direction of the tank body 10 to the air outlet pipe 30. Only then will the formed heat exchange gas enter the air outlet pipe 30, thereby avoiding the problem that the high-temperature gas or the low-temperature gas-liquid two-phase fluid directly enters the air outlet pipe 30 after entering the cavity and is discharged, thereby further ensuring the temperature, pressure and amount of liquid carried by the heat exchange gas instantly entering the compressor, thereby ensuring the normal operation of the compressor.
[0045] like Figure 1As shown, the ends of the air inlet pipe 21 and the first auxiliary pipe 22 connected to the tank body 10 are tangent to the tank wall and connected to the cavity. This arrangement can ensure that the high-temperature gas and the low-temperature gas-liquid two-phase fluid can directly enter the cavity from the air inlet pipe 21 and the first auxiliary pipe 22, and no liquid residue will appear at the end of the air inlet pipe 21 and the first auxiliary pipe 22 connected to the cavity. In addition, since the air inlet pipe 21 and the first auxiliary pipe 22 are arranged tangent to the tank body 10, the high-temperature gas and the low-temperature gas will rotate around the inner wall of the tank body 10 after entering the tank body 10. This process increases the total distance of the high-temperature gas and the low-temperature gas from entering the tank body 10 to being discharged from the tank body 10, thereby increasing the overall heat exchange time, and then ensuring that this process can fully exchange heat, so that the low-temperature liquid is as completely vaporized as possible, thereby reducing the amount of low-temperature liquid in the cavity, so that the liquid in the liquid accumulating tank 11 is only lubricating oil.
[0046] Considering that in the prior art, the temperature of the heat exchange gas entering the compressor may be too low and cannot reach the preset temperature. Figure 1 As shown, the air intake mechanism 20 further includes a second auxiliary pipe 23, which is disposed on the tank wall of the tank body 10. One end of the second auxiliary pipe 23 is connected to the cavity, and the other end can introduce high-temperature gas into the cavity when the amount of high-temperature gas introduced into the air intake pipe 21 decreases, so that the heat exchange gas can maintain a preset temperature and a preset pressure. When the amount of high-temperature gas introduced into the air intake pipe 21 decreases, the high-temperature gas can continue to be introduced into the cavity through the second auxiliary pipe 23, thereby ensuring that there is enough high-temperature gas in the cavity, thereby ensuring a good heat exchange effect, and maximizing the gasification of the low-temperature liquid.
[0047] like Figure 1 As shown, one end of the second auxiliary pipe 23 connected to the tank body 10 is tangent to the tank wall and communicates with the cavity. The high-temperature gas entering the tank body 10 through the second auxiliary pipe 23 can flow along the inner wall of the tank body 10, increasing the total distance of the high-temperature gas from entering the tank body 10 to exiting the tank body 10, thereby ensuring a good heat exchange effect. Figure 1 As shown, the air inlet pipe 21, the first auxiliary pipe 22 and the second auxiliary pipe 23 are arranged at intervals along the axial direction of the tank body 10. This arrangement can ensure that the high-temperature gas entering from the air inlet pipe 21 is mixed with the low-temperature gas-liquid two-phase fluid introduced from the first auxiliary pipe 22 in the process of flowing to the air outlet pipe 30, and fully exchanges heat in the process of flowing to the air outlet pipe 30. When the air intake of the air inlet pipe 21 is insufficient, the second auxiliary pipe 23 can timely supplement the high-temperature gas to participate in the heat exchange, avoiding the situation of uneven local heat exchange, thereby ensuring that the low-temperature liquid can be gasified to the greatest extent, so that there is only lubricating oil in the liquid accumulation tank 11, thereby ensuring the normal use of the compressor.
[0048] When using the expansion device of this embodiment, the air inlet pipe 21 is connected to the evaporator, and the air outlet pipe 30 is connected to the compressor, and high-temperature gas and low-temperature gas-liquid two-phase fluid are introduced into the tank body 10 to exchange heat with the high-temperature gas and low-temperature gas-liquid two-phase fluid and vaporize the low-temperature fluid; when the air intake of the high-temperature gas is reduced, the second auxiliary pipe 23 introduces high-temperature gas into the tank body 10 to participate in the heat exchange; the liquid mixed with the low-temperature liquid and lubricating oil generated in the cavity enters the liquid accumulation tank 11, and when the liquid level is flush with the return hole 33, the liquid enters the air outlet pipe 30. When the U-shaped tube 34 is full of liquid, the heat exchange gas pushes the liquid into the compressor, and under the action of the internal structure of the compressor and gravity, the lubricating oil is transported back to the compressor oil tank, and the low-temperature liquid can be transported back to the cavity to participate in the heat exchange again. During this process, not only can the low-temperature fluid be quickly vaporized, but the heat exchange gas can also be separated from the low-temperature liquid that has not been completely vaporized, as well as the lubricating oil generated during use, thereby achieving gas-liquid separation; in addition, the separated liquid will not be instantly transmitted back to the compressor, thereby ensuring that the compressor can always operate normally.
[0049] In summary, the use of the expansion device can not only reduce the instantaneous liquid return volume of the compressor, but also ensure that the lubricating oil in the cavity can be transferred back to the compressor in time.
[0050] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.
Claims
1. An expansion device used to reduce the instantaneous liquid return of the compressor, It is characterized in that include: A tank body (10) has a cavity formed inside, a tank wall of the tank body (10) is provided with a liquid collection groove (11), and the liquid collection groove (11) is connected to the cavity, and the liquid collection groove (11) can accommodate liquid in the cavity; An air intake mechanism (20), one end of which is connected to the cavity and the other end of which is capable of introducing heat exchange gas into the cavity; An outlet pipe (30), a first end (31) of which passes through the liquid accumulating groove (11) and is connected to the cavity, and a second end (32) of which is connected to the compressor, so that the heat exchange gas can enter the compressor; a side wall of the outlet pipe (30) located in the liquid accumulating groove (11) is provided with a liquid return hole (33), and when the liquid level in the liquid accumulating groove (11) is flush with the liquid return hole (33), the liquid can enter the outlet pipe (30) through the liquid return hole (33), so that the liquid can be carried out by the heat exchange gas.
2. The expansion device according to claim 1, It is characterized in that A plurality of the liquid return holes (33) are arranged at intervals along the vertical direction, and the plurality of liquid return holes (33) are arranged in a straight line.
3. The expansion device according to claim 2, It is characterized in that The diameters of the plurality of liquid return holes (33) gradually increase in a direction approaching the cavity.
4. An expansion device according to any one of claims 1 to 3, It is characterized in that The height of the first end (31) in the vertical direction is higher than the top of the liquid collection tank (11).
5. An expansion device according to any one of claims 1 to 3, It is characterized in that The first end (31) and the second end (32) are connected via a U-shaped tube (34), and the liquid can be stored in the U-shaped tube (34).
6. An expansion device according to any one of claims 1 to 3, It is characterized in that The air intake mechanism (20) comprises an air intake pipe (21) and a first auxiliary pipe (22), wherein the air intake pipe (21) and the first auxiliary pipe (22) are arranged on the tank wall of the tank body (10) away from the air outlet pipe (30) along the axial direction of the tank body (10); The air inlet pipe (21) can pass high-temperature gas into the cavity, and the first auxiliary pipe (22) can pass low-temperature gas-liquid two-phase fluid into the cavity. The high-temperature gas and the low-temperature gas-liquid two-phase fluid can form the heat exchange gas in the cavity.
7. The expansion device according to claim 6, It is characterized in that One end of the air inlet pipe (21) and the first auxiliary pipe (22) respectively connected to the tank body (10) is tangent to the tank wall and communicates with the cavity.
8. The expansion device according to claim 6, It is characterized in that The air intake mechanism (20) further comprises a second auxiliary pipe (23), wherein the second auxiliary pipe (23) is arranged on the tank wall of the tank body (10), one end of the second auxiliary pipe (23) is connected to the cavity, and the other end of the second auxiliary pipe (23) is capable of introducing the high-temperature gas into the cavity when the amount of high-temperature gas introduced through the air intake pipe (21) is reduced, so that the heat exchange gas maintains a preset temperature and a preset pressure.
9. The expansion device according to claim 8, It is characterized in that One end of the second auxiliary pipe (23) connected to the tank body (10) is tangent to the tank wall and communicates with the cavity.
10. The expansion device according to claim 8, It is characterized in that The air inlet pipe (21), the first auxiliary pipe (22) and the second auxiliary pipe (23) are arranged at intervals along the axial direction of the tank body (10).