Heat exchange tank for heat exchange system

Abstract

The application relates to a heat exchange tank for a heat exchange system, which comprises a tank body, an inner cylinder arranged in the tank body, an inner cavity arranged in the tank body, the inner cylinder being communicated with the inner cavity, and a heat exchange coil for heat exchange fluid circulation being connected to the inner cylinder; a refrigerant inlet is connected to the upper portion of the tank body, a refrigerant outlet is connected to the bottom end of the tank body, a liquid discharge pipe is communicated with the inner side of the inner cylinder at the refrigerant outlet, and a notch is arranged on the side wall of the liquid discharge pipe in the height direction; an oil return bottom plate is arranged in the liquid discharge pipe and is slidingly connected with the liquid discharge pipe; the oil return bottom plate is communicated with an oil return pipe, the oil return pipe extends out of the tank body and is connected with a compressor; a lifting device is arranged in the tank body and is used for driving the oil return bottom plate to lift; a detection device is further connected to the oil return bottom plate and is used for detecting the oil-liquid interface between lubricating oil and liquid refrigerant in the tank body; and the lifting device is electrically connected with the detection device. The application has the effect of improving the low lubricating oil return efficiency of the heat exchange tank.

Description

Technical Field

[0001] This application relates to the technical field of heat exchange tanks, and more particularly to a heat exchange tank for a heat exchange system. Background Technology

[0002] A heat exchange tank is a device used in a heat exchange system. It contains heat exchange coils through which a fluid for heat exchange flows. In the heat exchange system, a compressor is connected upstream of the heat exchange tank. The refrigerant gas is compressed by the compressor into a high-temperature, high-pressure gaseous state and enters the heat exchange tank. Once inside, it exchanges heat with the fluid in the heat exchange coils, thus achieving heat exchange.

[0003] However, when the refrigerant gas is discharged from the compressor, it will carry away some of the lubricating oil in the compressor, causing problems such as oil shortage and wear, which will affect the working performance and service life of the compressor. Therefore, it is necessary to recover the lubricating oil that enters the heat exchange tank back to the compressor to reduce the occurrence of oil shortage in the compressor.

[0004] Currently, the common method for recovering lubricating oil in heat exchange tanks is to discharge the condensed liquid refrigerant and lubricating oil together from the refrigerant outlet connected to the bottom of the tank. After separation by a separator, the separated lubricating oil is recovered to the compressor. However, because the density of lubricating oil is less than that of liquid refrigerant, the lubricating oil floats on the surface of the liquid refrigerant. This causes the liquid refrigerant to be discharged first. When there is a large amount of liquid refrigerant stored in the tank, the lubricating oil is far from the refrigerant outlet, resulting in low lubricating oil discharge efficiency and affecting the oil return efficiency of the compressor. Summary of the Invention

[0005] In order to improve the problem of low lubricating oil return efficiency in heat exchange tanks, this application provides a heat exchange tank for a heat exchange system.

[0006] This application provides a heat exchange tank for a heat exchange system, which adopts the following technical solution:

[0007] A heat exchange tank for a heat exchange system includes a tank body, an inner cylinder inside the tank body, an inner cavity inside the tank body, the inner cylinder communicating with the inner cavity, and a heat exchange coil for heat exchange fluid flow connected to the inner cylinder; a refrigerant inlet is connected to the upper part of the tank body, a refrigerant outlet is connected to the bottom end of the tank body, and a drain pipe is connected to the inner side of the inner cylinder, with a groove provided on the side wall of the drain pipe along the height direction;

[0008] An oil return base plate is provided inside the drain pipe, and the oil return base plate is slidably connected to the drain pipe;

[0009] The oil return bottom plate is connected to an oil return pipe, which extends out of the tank and connects to the compressor;

[0010] The tank is equipped with a lifting device, which is used to drive the oil return plate to rise and fall; a detection device is also connected to the oil return plate, which is used to detect the height of the oil-liquid interface between the lubricating oil and the liquid refrigerant in the tank; the lifting device is electrically connected to the detection device.

[0011] By adopting the above technical solution, when the detection equipment detects the oil-liquid interface between the lubricating oil and liquid refrigerant in the tank, the detection equipment can use an electrical signal to activate the lifting device, thereby raising and lowering the oil return base plate. This ensures that the oil return base plate is always above the oil-liquid interface, thus ensuring that all liquid discharged through the oil return pipe is lubricating oil. Since the liquid in the oil return pipe is entirely lubricating oil, it can directly return to the compressor, improving oil return efficiency and reducing the possibility of compressor performance degradation due to oil shortage.

[0012] Optionally, the detection device includes a first detection circuit and a second inspection circuit, wherein the first detection circuit is used to detect the rise of the oil-liquid interface between the lubricating oil and the liquid refrigerant; and the second detection circuit is used to detect the fall of the oil-liquid interface between the lubricating oil and the liquid refrigerant.

[0013] By adopting the above technical solution, after the first detection circuit and the second detection circuit detect the rise and fall of the oil interface, they use electrical signals to make the lifting device work, thereby realizing the rise and fall of the oil return plate, so that the oil discharged from the oil return pipe is all lubricating oil, thus improving the oil return efficiency.

[0014] Optionally, the first detection circuit includes a first conductive rod and a second conductive rod connected to the oil return base plate; the second detection circuit includes a third conductive rod and a fourth conductive rod connected to the oil return base plate; the distance from the bottom of the first conductive rod, the third conductive rod, the second conductive rod and the fourth conductive rod to the bottom of the inner cylinder increases sequentially, and the bottom surface of the oil return base plate is higher than the bottom end of the fourth conductive rod.

[0015] By adopting the above technical solution, when the detection circuit of the first conductive rod and the second conductive rod detects a sudden change in conductivity, the detection device controls the lifting device to work through an electrical signal. The lifting device raises the oil return base plate, thereby ensuring that the oil return base plate is always above the oil interface, so that the liquid discharged from the oil return pipe is all lubricating oil, thus improving the oil return efficiency.

[0016] When the detection circuit of the third conductive rod and the fourth conductive rod detects a sudden change in conductivity, the detection device controls the lifting device to work through an electrical signal. The lifting device lowers the oil return plate, reducing the possibility that the lubricating oil will move away from the oil return plate after the oil interface drops, thus preventing the lubricating oil from being effectively discharged through the oil return pipe.

[0017] Optionally, the lifting device includes a first driving member, the output end of which is connected to a first transmission rod, the first transmission rod being connected to the oil return plate, and the first driving member being used to drive the lifting of the oil return plate.

[0018] By adopting the above technical solution, the first driving component realizes the lifting and lowering of the oil return base plate through the first transmission rod, so that all the oil entering the oil return pipe and being discharged is lubricating oil, thereby improving the oil return efficiency.

[0019] Optionally, the lifting device further includes a guide rod connected to the inner cylinder, and the guide rod is slidably connected to the oil return plate.

[0020] By adopting the above technical solution, the guide rod can restrict the movement direction of the oil return plate, so that the oil return plate can only rise and fall on the guide rod, thereby improving the stability of the oil return plate when it rises and falls.

[0021] Optionally, a limit block is connected to the guide rod, the limit block being used to limit the lowest point of the return oil base plate's descent.

[0022] By adopting the above technical solution, the oil return plate reaches its minimum descent height when it abuts against the limiting block, reducing the possibility of the detection device colliding with the bottom of the inner cylinder due to excessively low descent height.

[0023] Optionally, the tank body is provided with a cleaning device, the cleaning device including a support gear rotatably connected to the drain pipe, a scraper connected to the support gear, the scraper abutting against the inner wall of the inner cylinder; the cleaning device also includes a drive assembly for driving the support gear to rotate.

[0024] By adopting the above technical solution, the scraper can scrape off the lubricating oil adhering to the inner wall of the inner cylinder, reducing the possibility that the lubricating oil will stick to the inner cylinder and affect the liquid flow efficiency.

[0025] Optionally, the drive assembly includes a second drive member and a second transmission rod. The second drive member is connected to the support gear via the second transmission rod, and the second drive member is used to drive the support gear to rotate.

[0026] By adopting the above technical solution, the second driving member drives the support gear to rotate through the second transmission rod, so that the scraper connected to the support gear can rotate.

[0027] Optionally, the heat exchange coil is a finned tube.

[0028] By adopting the above technical solution, the finned tube design of the heat exchange coil can increase the heat exchange area and improve the heat exchange efficiency.

[0029] Optionally, the tank body is provided with an inclined liquid guide plate, the lowest point of which is connected to the bottom of the inner cylinder.

[0030] By adopting the above technical solution, the liquid guide plate can effectively guide the flow of liquid refrigerant and lubricating oil in the tank to the drain pipe, thereby improving the flow efficiency of liquid refrigerant and lubricating oil and increasing the discharge rate.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. By combining the detection equipment with the lifting device, the oil return base plate is raised and lowered, so that the oil return base plate is always above the oil-liquid interface. This ensures that all the liquid discharged through the oil return pipe is lubricating oil, which can be directly returned to the compressor. This improves the oil return efficiency and reduces the possibility of the compressor's performance being damaged due to lack of oil.

[0033] 2. When a sudden change in conductivity is detected by the detection circuit of the first and second conductive rods, the detection equipment controls the lifting device to work through an electrical signal. The lifting device raises the oil return plate, thereby ensuring that the oil return plate is always above the oil interface, so that the liquid discharged from the oil return pipe is all lubricating oil, thus improving the oil return efficiency.

[0034] 3. When a sudden change in conductivity is detected by the detection circuit of the third and fourth conductive rods, the detection equipment controls the lifting device to work through an electrical signal. The lifting device lowers the oil return plate, reducing the possibility that the lubricating oil will move away from the oil return plate after the oil interface drops, thus preventing the lubricating oil from being effectively discharged through the oil return pipe. Attached Figure Description

[0035] Figure 1 This is a cross-sectional view of a heat exchange tank for a heat exchange system according to this application;

[0036] Figure 2 This application describes a heat exchange tank for use in a heat exchange system. Figure 1 Enlarged view of section A in the image;

[0037] Figure 3This is a top view of the return oil bottom plate of a heat exchange tank for a heat exchange system according to this application;

[0038] Figure 4 This is a schematic diagram illustrating the principle of the rising of the return oil bottom plate of a heat exchange tank in a heat exchange system according to this application.

[0039] Figure 5 This is a schematic diagram illustrating the principle of the descent of the return oil bottom plate of a heat exchange tank in a heat exchange system according to this application.

[0040] In the diagram, 1. Tank body; 101. Refrigerant inlet; 102. Refrigerant outlet; 103. Fluid inlet; 104. Fluid outlet; 105. Inner cavity; 106. Outer cavity; 2. Inner cylinder; 201. Oil return hole; 3. Heat exchange coil; 4. Drain pipe; 401. Groove; 402. Slide groove; 5. Oil return bottom plate; 501. Drainage section; 502. Support section; 6. Oil return pipe; 7. Lifting device; 701. First driving component; 702. First transmission rod; 703. Guide rod; 8. Detection equipment; 801. First conductive rod; 802. Second conductive rod; 803. Third conductive rod; 804. Fourth conductive rod; 9. Cleaning device; 901. Second driving component; 902. Second transmission rod; 903. Support gear; 904. Scraper; 10. Limiting block; 11. Liquid guide plate. Detailed Implementation

[0041] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application will be described in further detail below.

[0042] This application discloses a heat exchange tank for a heat exchange system. For example... Figure 1 As shown, the heat exchange tank includes a tank body 1, with a fluid inlet 103 for the heat exchange fluid to enter and a fluid outlet 104 for the heat exchange fluid to exit. A refrigerant inlet 101 for refrigerant to enter is connected to the upper end of the tank body 1, and a refrigerant outlet 102 for refrigerant to exit is connected to the bottom of the tank body 1. A separator is connected to the refrigerant outlet 102. The liquid discharged from the refrigerant outlet 102 passes through the separator to separate the lubricating oil and liquid refrigerant. The separated lubricating oil enters the compressor, and the separated liquid refrigerant enters the next stage.

[0043] like Figure 1As shown, an inner cylinder 2 is fixedly connected inside the tank body 1. An inner cavity 105 is formed between the outer side of the inner cylinder 2 and the inner wall of the tank body 1, and the inner cavity 105 is connected to the refrigerant inlet 101. Several oil return holes 201 are provided on the periphery of the inner cylinder 2, which connect the inner cylinder 2 to the inner cavity 105 of the tank body 1. A drain pipe 4 is provided inside the inner cylinder 2, and the bottom end of the drain pipe 4 is connected to the refrigerant outlet 102. A heat exchange coil 3 is also connected to the inner cylinder 2. The heat exchange coil 3 is located in the inner cavity 105, and its two ends are connected to the fluid inlet 103 and the fluid outlet 104, respectively.

[0044] The high-temperature, high-pressure gaseous refrigerant, after being compressed by the compressor, enters the tank 1 through the refrigerant inlet 101. After exchanging heat with the heat exchange fluid in the heat exchange coil 3, it condenses into a liquid state. The liquid refrigerant and the accompanying lubricating oil enter the inner cylinder 2 through the oil return hole 201 and are discharged from the refrigerant outlet 102 through the drain pipe 4. Preferably, the heat exchange coil 3 is a finned tube, which can increase the heat exchange area and improve the heat exchange efficiency.

[0045] like Figure 2 and Figure 3 As shown, a slot 401 is provided on the side of the drain pipe 4. The upper end of the slot 401 extends to the top of the drain pipe 4, and the bottom of the slot 401 is located near the bottom of the inner cylinder 2. The liquid in the tank 1 enters the drain pipe 4 through the slot 401. When the liquid refrigerant and lubricating oil are discharged through the drain pipe 4, because the density of the liquid refrigerant is greater than that of the lubricating oil, the lubricating oil floats on the upper surface of the liquid refrigerant. The slot 401 increases the discharge height, allowing the lubricating oil and liquid refrigerant to enter the drain pipe 4 simultaneously.

[0046] like Figure 2 and Figure 3 As shown, a return oil base plate 5 is slidably connected inside the drain pipe 4. The return oil base plate 5 includes a drain section 501 inside the drain pipe 4 and a support section 502 extending out of the drain pipe 4. A groove 402 is provided on the side wall of the drain pipe 4 to facilitate the extension and sliding of the support section 502. The drain section 501 is connected to a return oil pipe 6. One end of the return oil pipe 6 is connected to the bottom surface of the drain section 501, and the other end is connected to the compressor outside the tank body 1. The return oil pipe 6 is a flexible hose, so that the pipe opening of the return oil pipe 6 can rise and fall together with the rise and fall of the return oil base plate 5.

[0047] In addition, such as Figure 1 As shown, an inclined liquid guide plate 11 is fixedly connected to the bottom of the tank 1. The lowest point of the liquid guide plate 11 is fixedly connected to the bottom of the inner cylinder 2. The liquid guide plate 11 can effectively guide the liquid refrigerant and lubricating oil in the tank 1 to the drain pipe 4, thereby improving the flow efficiency of the liquid refrigerant and lubricating oil and increasing the discharge rate.

[0048] like Figure 1 and Figure 2As shown, a lifting device 7 is provided inside the tank body 1. The lifting device 7 includes a first driving component 701. The tank body 1 has an outer cavity 106 below the liquid guide plate 11, and the first driving component 701 is located in the outer cavity 106. Preferably, the first driving component 701 is a motor. A first driving gear is fixedly connected to the output end of the first driving component 701. The first driving gear is connected to a first transmission rod 702. A first driven gear is fixedly connected to one end of the first transmission rod 702. The first driving gear and the first driven gear mesh, so that the first driving component 701 can drive the first transmission rod 702 to rotate. The first transmission rod 702 is connected to the bottom of the inner cylinder 2 through a sealed bearing. The first transmission rod 702 is a screw, and the first transmission rod 702 is threadedly connected to the support part 502 of the oil return bottom plate 5. A guide rod 703 is provided on one side of the first transmission rod 702. The guide rod 703 is fixedly connected to the bottom of the inner cylinder 2, passes through the support part 502, and is slidably connected to the oil return base plate 5. When the oil return base plate 5 rises and falls, it also rises and falls on the guide rod 703, improving the stability of the oil return base plate 5 during rising and falling. When the first transmission rod 702 rotates, the stable rising and falling of the oil return base plate 5 within the drain pipe 4 is achieved through its cooperation with the guide rod 703.

[0049] like Figure 1 and Figure 2 As shown, a detection device 8 is also provided on the support part 502. The detection device 8 can detect the conductivity of the liquid refrigerant and lubricating oil in the tank 1, thereby realizing the detection of the oil-liquid interface between the liquid refrigerant and lubricating oil, and thus ensuring that all the oil discharged in the oil return pipe 6 is lubricating oil, thereby improving the oil return efficiency.

[0050] Specifically, such as Figure 2 and Figure 4 As shown, the detection device 8 includes a first detection circuit and a second detection circuit. The first detection circuit includes a first conductive rod 801 and a second conductive rod 802. The second detection circuit includes a third conductive rod 803 and a fourth conductive rod 804. The first conductive rod 801, the second conductive rod 802, the third conductive rod 803, and the fourth conductive rod 804 are all fixedly connected to the support portion 502 of the return oil base plate 5.

[0051] Both the first and second detection circuits are electrically connected to the processor of the detection device 8 to realize the detection of liquid conductivity.

[0052] Simultaneously, the testing device 8 is electrically connected to the lifting device 7. Specifically, both the testing device 8 and the lifting device 7 are electrically connected to an externally installed controller. The testing device 8 transmits electrical signals to the controller, causing the controller to control the lifting device 7 to operate, thereby achieving linkage between the testing device 8 and the lifting device 7.

[0053] In addition, such as Figure 2 and Figure 4As shown, the distances from the bottom ends of the first conductive rod 801, the third conductive rod 803, the second conductive rod 802, and the fourth conductive rod 804 to the bottom of the inner cylinder 2 increase sequentially. To improve the accuracy of detection, the height difference between the bottom ends of adjacent conductive rods can be 1mm to 4mm. In this embodiment, the height difference between the bottom ends of adjacent conductive rods is 2mm. The upper surface of the oil return plate 5 is slightly higher than the bottom end of the fourth conductive rod 804, and the height difference between the upper surface and the bottom end of the fourth conductive rod 804 is 3mm.

[0054] When the liquid conductivity detected by the first detection circuit changes abruptly, the oil-liquid interface is in a rising state. Specifically, for example... Figure 4 As shown, when the first conductive rod 801 is located in the liquid refrigerant layer and the second conductive rod 802 is located in the lubricating oil layer, the first detection circuit can detect the conductivity of the liquid. As the amount of liquid refrigerant and lubricating oil increases, the oil-liquid interface gradually rises. When the oil-liquid interface contacts the second conductive rod 802 and continues to rise until the second conductive rod 802 is located in the liquid refrigerant layer, the first detection circuit detects a sudden change in the liquid conductivity. At this time, the first detection circuit uses an electrical signal to control the lifting device 7, which in turn raises the return oil base plate 5.

[0055] When the lifting device 7 positions the first conductive rod 801 in the liquid refrigerant layer and the second conductive rod 802 in the lubricating oil layer, the first detection circuit detects the conductivity in this state and stops controlling the lifting device 7. The lifting device 7 stops working, causing the return oil base plate 5 to stop rising, reducing the possibility that the return oil base plate 5 might rise too high, preventing the lubricating oil from being discharged from the return oil pipe 6.

[0056] As the oil interface rises, the return oil base plate 5 ensures that all the oil entering the return oil pipe 6 is lubricating oil, thus improving the return oil efficiency.

[0057] When the liquid conductivity detected by the second detection circuit changes abruptly, the oil-liquid interface is in a state of decline. Specifically, for example... Figure 5 As shown, when the third conductive rod 803 is located in the liquid refrigerant layer and the fourth conductive rod 804 is located in the lubricating layer, the second detection circuit detects the liquid conductivity. As the liquid refrigerant and lubricating oil are discharged, the oil-liquid interface gradually descends. When the oil-liquid interface descends to the point where the third conductive rod 803 contacts the oil-liquid interface, and continues to descend until the third conductive rod 803 is located in the lubricating oil layer, the second detection circuit detects a sudden change in liquid conductivity. At this time, the second detection circuit uses an electrical signal to control the lifting device 7, which in turn lowers the return oil base plate 5.

[0058] When the lifting device 7 positions the third conductive rod 803 in the liquid refrigerant layer and the fourth conductive rod 804 in the lubricating oil layer, the second detection circuit detects the conductivity in this state and stops controlling the lifting device 7. The lifting device 7 stops operating, causing the return oil base plate 5 to stop descending, reducing the possibility that the return oil base plate 5 might descend excessively and cross the oil-liquid interface, causing liquid refrigerant to also be discharged from the return oil pipe 6.

[0059] As the oil interface of the return oil base plate 5 descends, even when the overall liquid volume of the lubricating oil in the tank decreases, it can still be discharged from the return oil pipe 6, thus improving the return oil efficiency.

[0060] Through the cooperation of the first detection circuit, the second detection circuit and the lifting device 7, the oil return base plate 5 is dynamically changed as the oil interface rises and falls, so that the liquid discharged from the oil return pipe 6 is lubricating oil, thereby improving the oil return efficiency of the compressor.

[0061] like Figure 2 As shown, a limiting block 10 is also fixedly connected to the guide rod 703. When the lifting device 7 controls the return oil base plate 5 to descend, the contact height between the return oil base plate 5 and the limiting block 10 is the minimum descent height of the return oil base plate 5. By limiting the lowest descent height of the return oil base plate 5, the possibility of the detection device 8 colliding with the bottom of the inner cylinder 2 due to the descent height being too low is reduced.

[0062] like Figure 2 As shown, a cleaning device 9 is installed inside the tank 1. The cleaning device 9 includes a support gear 903 rotatably connected to the upper end of the drain pipe 4. A second driving member 901 is also installed in the outer cavity 106 at the bottom of the tank 1. Preferably, the second driving member 901 is a motor. The output end of the second driving member 901 is connected to a second drive gear. The second driving member 901 is connected to a second transmission rod 902. The two ends of the second transmission rod 902 are respectively connected to a second transmission gear and a third transmission gear. The second transmission gear meshes with the second drive gear, and the third transmission gear meshes with the support gear 903, realizing that the second driving member 901 drives the support gear 903 to rotate. The second transmission rod 902 passes through the bottom of the inner cylinder 2 and is connected to the bottom plate of the inner cylinder 2 through a sealed bearing. A scraper 904 is also fixedly connected to the support gear 903, and the scraper 904 abuts against the inner wall of the inner cylinder 2. When the support gear 903 rotates, the scraper 904 scrapes the inner wall of the inner cylinder 2. Since the lubricating oil has a certain viscosity after cooling, the scraper 904 scrapes the inner wall, reducing the possibility of the lubricating oil clogging the return oil hole 201.

[0063] The implementation principle of a heat exchange tank for a heat exchange system according to an embodiment of this application is as follows:

[0064] As the amount of liquid refrigerant and lubricating oil gradually increases, when the detection device 8 detects a rise in the oil interface, it controls the lifting device 7 to raise the oil return plate 5, allowing the lubricating oil in the lubricating oil layer to be directly recovered to the compressor through the oil return pipe 6. Conversely, as the liquid refrigerant and lubricating oil decrease during the drainage process, the detection device detects a drop in the oil interface. It then controls the lifting device 7 to lower the oil return plate 5, reducing the possibility that the lubricating oil layer might fall below the oil return plate 5 and fail to drain from the oil return pipe 6, thus improving oil return efficiency.

[0065] When the return oil base plate 5 descends to its lowest point, the top surface of the lubricating oil layer gradually descends to below the return oil base plate 5. At this time, a small amount of lubricating oil and liquid refrigerant are discharged from the bottom of the drain pipe 4 through the refrigerant outlet 102 and separated by the separator.

[0066] By directly recovering the lubricating oil above the oil-liquid interface from the oil return pipe 6 back to the compressor, the possibility of excessive liquid refrigerant storage affecting the lubricating oil discharge efficiency is reduced, the oil return efficiency of the compressor is improved, and the working performance of the compressor is guaranteed.

[0067] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A heat exchange tank for a heat exchange system, characterized in that, The device includes a tank (1), an inner cylinder (2) inside the tank (1), an inner cavity (105) inside the tank (1), the inner cylinder (2) communicating with the inner cavity (105), and a heat exchange coil (3) for heat exchange fluid flow connected to the inner cylinder (2); a refrigerant inlet (101) is connected to the upper part of the tank (1), and a refrigerant outlet (102) is connected to the bottom end of the tank (1). The refrigerant outlet (102) is connected to a drain pipe (4) inside the inner cylinder (2), and a slot (401) is provided on the side wall of the drain pipe (4) along the height direction. An oil return bottom plate (5) is provided inside the drain pipe (4), and the oil return bottom plate (5) is slidably connected to the drain pipe (4); the oil return bottom plate (5) is connected to an oil return pipe (6), and the oil return pipe (6) extends out of the tank body (1) and is connected to the compressor; The tank (1) is equipped with a lifting device (7), which is used to drive the oil return plate (5) to rise and fall; the oil return plate (5) is also connected to a detection device (8), which is used to detect the height of the oil-liquid interface between the lubricating oil and the liquid refrigerant in the tank (1); the lifting device (7) is electrically connected to the detection device (8); The detection device (8) includes a first detection circuit and a second detection circuit. The first detection circuit is used to detect the rise of the oil-liquid interface between the lubricating oil and the liquid refrigerant. The second detection circuit is used to detect the fall of the oil-liquid interface between the lubricating oil and the liquid refrigerant. The first detection circuit includes a first conductive rod (801) and a second conductive rod (802) connected to the return oil base plate (5). When the first conductive rod (801) is located in the liquid cold coal layer and the second conductive rod (802) is located in the lubricating oil layer, the first detection circuit detects the liquid conductivity. The second detection circuit includes a third conductive rod (803) and a fourth conductive rod (804) connected to the oil return base plate (5). When the third conductive rod (803) is located in the liquid refrigerant layer and the fourth conductive rod (804) is located in the lubricating oil layer, the second detection circuit detects the liquid conductivity. The distances from the bottom of the first conductive rod (801), the third conductive rod (803), the second conductive rod (802) and the fourth conductive rod (804) to the bottom of the inner cylinder (2) increase sequentially, and the bottom surface of the oil return bottom plate (5) is higher than the bottom of the fourth conductive rod (804); When the oil interface rises to contact the second conductive rod (802), the first detection circuit detects a sudden change in the liquid conductivity and controls the lifting device (7) to drive the return oil base plate (5) to rise. When the oil interface descends to contact the third conductive rod (803), the second detection circuit detects a sudden change in the liquid conductivity and controls the lifting device (7) to drive the return oil base plate (5) to descend.

2. A heat exchange tank for a heat exchange system according to claim 1, characterized in that, The lifting device (7) includes a first driving member (701), the output end of the first driving member (701) is connected to a first transmission rod (702), the first transmission rod (702) is connected to the oil return base plate (5), and the first driving member (701) is used to drive the lifting of the oil return base plate (5).

3. A heat exchange tank for a heat exchange system according to claim 1, characterized in that, The lifting device (7) also includes a guide rod (703) connected to the inner cylinder (2), and the guide rod (703) is slidably connected to the oil return bottom plate (5).

4. A heat exchange tank for a heat exchange system according to claim 3, characterized in that, A limiting block (10) is connected to the guide rod (703), and the limiting block (10) is used to limit the lowest point of the descent of the return oil base plate (5).

5. A heat exchange tank for a heat exchange system according to claim 1, characterized in that, The tank (1) is equipped with a cleaning device (9), which includes a support gear (903) rotatably connected to the drain pipe (4). A scraper (904) is connected to the support gear (903), and the scraper (904) abuts against the inner wall of the inner cylinder (2). The cleaning device (9) also includes a drive assembly, which is used to drive the support gear (903) to rotate.

6. A heat exchange tank for a heat exchange system according to claim 5, characterized in that, The drive assembly includes a second drive member (901) and a second transmission rod (902). The second drive member (901) is connected to the support gear (903) via the second transmission rod (902). The second drive member (901) is used to drive the support gear (903) to rotate.

7. A heat exchange tank for a heat exchange system according to claim 1, characterized in that, The heat exchange coil (3) is a finned tube.

8. A heat exchange tank for a heat exchange system according to claim 1, characterized in that, An inclined liquid guide plate (11) is provided inside the tank (1), and the lowest point of the liquid guide plate (11) is connected to the bottom of the inner cylinder (2).

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