Oil tank structure and oil return system

Abstract

The utility model provides an oil tank structure and an oil return system, the oil tank structure comprises an oil storage tank, the oil storage tank is provided with a containing cavity, the containing cavity is used for containing oil, the containing cavity is provided with an oil inlet, and the oil inlet is used for allowing the oil to enter the containing cavity; the balance structure comprises a separation part and an oil return tank, and the separation part is used for separating oil carried by the refrigerant; the separation part is communicated with the oil return tank; the oil return tank comprises an oil return pipeline; the oil return pipeline is communicated with the containing cavity and provided with an oil return valve, and the oil return valve is used for controlling the oil return pipeline to be connected or disconnected. The oil tank structure solves the technical problems that in the prior art, an oil tank is prone to oil leakage, and oil return is difficult.

Description

Technical Field

[0001] The utility model relates to the technical field of oil tank cooling, in particular to an oil tank structure and an oil return system. Background Art

[0002] In the use of conventional oil-bearing chillers, one of the conditions to ensure the reliable operation of the unit is the normal operation of the oil bearings. For the oil bearings to work properly, the oil supply must be stable and the oil temperature must be within a suitable range.

[0003] During the operation of the chiller, the oil lubricates the bearings and takes away the heat generated by the bearings before flowing back to the oil tank. The high-temperature oil in the oil tank is usually cooled by throttling the refrigerant in the refrigeration system. This cooling method can only cool the surface of the oil but cannot fully cool the oil.

[0004] At the same time, the gaseous refrigerant after absorbing heat will carry small mist oil droplets floating inside the oil tank, causing the pressure inside the oil tank to rise sharply. Since the top of the oil tank is equipped with an oil tank balance port for balancing the internal pressure of the oil tank, the oil tank balance port is connected to the suction end of the compressor through a pipeline. When the internal pressure of the oil tank increases, the gaseous refrigerant and mist oil droplets inside the oil tank will be sucked away by the suction effect of the compressor, resulting in oil leakage. Even if a gas-liquid separator is added to the balance port, the effect is still not good.

[0005] Therefore, the prior art needs to be further developed. Utility Model Content

[0006] The purpose of the utility model is to overcome the above technical deficiencies and provide an oil tank structure and an oil return system to solve the technical problems in the related art that the oil tank is prone to oil leakage and oil return is difficult.

[0007] In order to achieve the above technical objectives, the utility model adopts the following technical solutions: an oil tank structure is provided, including: an oil storage tank, the oil storage tank has a accommodating chamber, the accommodating chamber is used to accommodate oil, the accommodating chamber has an oil inlet, and the oil inlet is used to supply oil into the accommodating chamber; a balancing structure, the balancing structure includes a separation part and an oil return tank, the separation part is used to separate the oil carried by the refrigerant; the separation part is connected with the oil return tank, and the oil return tank includes an oil return pipeline; the oil return pipeline is connected with the accommodating chamber, and an oil return valve is arranged on the oil return pipeline, and the oil return valve is used to control the on and off of the oil return pipeline.

[0008] Furthermore, the separation part includes: a separation chamber, which is connected to the accommodating chamber and the oil return tank; an exhaust pipe, which is connected to the top of the separation chamber, and the exhaust pipe is used to supply gas to discharge from the separation chamber; a separation plate body, which is multiple and arranged in the separation chamber at intervals, and the separation plate body is used for the oil entering the separation chamber to adhere to.

[0009] Furthermore, the separation part includes a connecting pipeline, which connects the accommodating chamber and the separation chamber. A separation valve is arranged in the connecting pipeline, and the separation valve is used to control the on-off of the connecting pipeline; a pressure detection module is arranged in the accommodating chamber, and the pressure detection module is used to detect the pressure in the accommodating chamber; the separation valve and the pressure detection module are signal-connected, and the pressure detection module is used to control the switch of the separation valve.

[0010] Furthermore, a liquid level detection module is provided in the oil return tank, and the liquid level detection module is used to detect the liquid level height in the oil return tank; the liquid level detection module is connected to the oil return valve signal, and the liquid level detection module is used to control the switch of the oil return valve.

[0011] Furthermore, an oil return port is provided on the oil return tank, and the oil return port is used for the refrigerant to carry the oil back into the oil return tank.

[0012] Furthermore, the oil tank structure also includes: a cooling box, which is sleeved on the outside of the oil storage tank, and a cooling cavity is provided between the cooling box and the oil storage tank, and the cooling cavity is used to accommodate cooling liquid; the cooling liquid is used to absorb the heat of the oil; a liquid inlet connected to the cooling cavity is provided on one side of the cooling box, and a liquid outlet connected to the cooling cavity is provided on the side of the cooling box away from the liquid inlet; the cooling liquid in the cooling cavity flows from the liquid inlet to the liquid outlet.

[0013] Furthermore, the oil tank structure also includes: a temperature detection module, which is arranged in the accommodating chamber and is used to detect the temperature of the oil in the accommodating chamber; a liquid supply module, which is connected to the liquid inlet; the liquid supply module is signal-connected to the temperature detection module, and the liquid supply module adjusts the supply speed of the cooling liquid according to the detection result of the temperature detection module.

[0014] Furthermore, the oil tank structure also includes: a cooling protrusion, which is protruding from the inner wall of the oil storage tank; the cooling protrusion is in contact with the oil in the accommodating cavity, and the cooling protrusion is used to extract the heat of the oil; the cooling protrusion has a cooling groove, which is connected to the cooling cavity, and the cooling groove is used to accommodate cooling liquid.

[0015] Furthermore, there are multiple cooling protrusions, and the multiple cooling structures are arranged in the accommodating cavity at intervals.

[0016] Furthermore, a plurality of circulation channels are provided on the cooling protrusion, and the circulation channels are used for oil to pass through.

[0017] An oil return system comprises: an oil tank structure; a circulation pipeline, the circulation pipeline is used for circulating a refrigerant, the circulation pipeline is connected with an oil inlet and an oil return port, and the oil tank structure is used for collecting oil in the circulation pipeline.

[0018] Beneficial effects:

[0019] The utility model proposes a new oil tank structure, including a main oil tank and an auxiliary oil tank. The main oil tank is provided with a box body with an inner and outer nested structure, and liquid can flow between the nests for cooling the oil in the oil tank. During cooling, the cooling liquid does not directly contact the oil in the oil tank. An oil return port is provided on the end surface of the main oil tank, and the lubricating oil in the compressor flows back to the main oil tank through the oil return port. A temperature sensor and a pressure sensor are also provided on the end surface of the main oil tank for real-time detection of the oil temperature of the main oil tank and the pressure in the main oil tank. An auxiliary oil tank is also provided, and the main oil tank and the auxiliary oil tank are combined into an integral oil tank. The auxiliary oil tank is connected to the main oil tank through a connecting pipe, and an electromagnetic on-off valve is provided on the connecting pipe. The auxiliary oil tank is provided with a balancing port, a liquid inlet and a liquid level sensor. Through the oil tank structure of the utility model, the problems of insufficient cooling of the lubricating oil and difficulty in oil leakage and oil return can be effectively solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the oil tank structure adopted in the embodiment of the utility model;

[0021] Figure 2 It is a schematic structural diagram of the cooling protrusion of the oil tank structure adopted in the embodiment of the utility model;

[0022] Figure 3 yes Figure 1 A partial enlarged schematic diagram of part A.

[0023] The above drawings include the following reference numerals:

[0024] 1. Oil storage tank; 11. Accommodating cavity; 12. Oil inlet; 2. Cooling protrusion; 21. Cooling groove; 22. Circulation channel; 3. Balance structure; 31. Separation part; 310. Separation cavity; 311. Exhaust pipeline; 312. Separation plate; 32. Connecting pipeline; 321. Separation valve; 33. Oil return tank; 332. Oil return port; 34. Oil return pipeline; 341. Oil return valve; 35. Liquid level detection module; 36. Pressure detection module; 4. Cooling box; 41. Cooling cavity; 42. Liquid inlet; 43. Liquid outlet; 5. Temperature detection module. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0026] According to an embodiment of the utility model, a fuel tank structure is provided. Figures 1 to 3 , including: an oil storage tank 1, the oil storage tank 1 has a accommodating chamber 11, the accommodating chamber 11 is used to accommodate oil, the accommodating chamber 11 has an oil inlet 12, the oil inlet 12 is used to supply oil into the accommodating chamber 11; a balancing structure 3, the balancing structure 3 includes a separation part 31 and an oil return tank 33, the separation part 31 is used to separate the oil carried by the refrigerant; the separation part 31 is connected to the oil return tank 33, the oil return tank 33 includes an oil return pipeline 34; the oil return pipeline 34 is connected to the accommodating chamber 11, and an oil return valve 341 is provided on the oil return pipeline 34, and the oil return valve 341 is used to control the on-off of the oil return pipeline 34.

[0027] With the above arrangement, the oil storage tank 1 and the balancing structure 3 are combined into an integral oil tank. The balancing structure 3 separates the oil carried by the gaseous refrigerant through the separation part 31 and stores it in the return oil tank 33, thereby solving the technical problem of oil leakage in the oil tank in the related technology. The oil in the return oil tank 33 returns to the accommodating chamber 11 again through the return oil pipeline 34, thereby solving the technical problem of difficulty in returning oil to the oil tank in the related technology.

[0028] Specifically, after the gaseous refrigerant in the accommodating chamber 11 carries the volatilized oil into the separation section 31 , gas-liquid separation is performed in the separation section 31 , and the liquid is collected at the bottom of the return oil tank 33 through the separation section 31 , and re-enters the accommodating chamber 11 through the return pipe 34 after a period of time.

[0029] In the fuel tank structure of this embodiment, see Figure 3 The separation part 31 includes: a separation chamber 310, which is connected to the receiving chamber 11 and the oil return tank 33; an exhaust pipe 311, which is connected to the top of the separation chamber 310, and is used to discharge gas from the separation chamber 310; and a separation plate 312, which is multiple, and is arranged in the separation chamber 310 at intervals, and is used for the oil entering the separation chamber 310 to adhere to. In this way, the gaseous refrigerant carrying oil enters the separation chamber 310 from the receiving chamber 11, and flows in the separation chamber 310. After passing through the separation plate 312, the oil adheres to the separation plate 312. When the oil on the separation plate 312 reaches a certain amount, it drips downward into the oil return tank 33, and the remaining gas is discharged from the oil tank through the exhaust pipe 311, completing the gas-liquid separation.

[0030] In the fuel tank structure of this embodiment, see Figure 1The separation part 31 includes a connecting pipeline 32, which connects the accommodating chamber 11 and the separation chamber 310. A separation valve 321 is arranged in the connecting pipeline 32, and the separation valve 321 is used to control the on-off of the connecting pipeline 32; a pressure detection module 36 is arranged in the accommodating chamber 11, and the pressure detection module 36 is used to detect the pressure in the accommodating chamber 11; the separation valve 321 and the pressure detection module 36 are signal-connected, and the pressure detection module 36 is used to control the switch of the separation valve 321. Since the bearing position of the compressor cannot be completely sealed, a very small amount of cooling liquid may still enter the bearing position during operation, and flow back to the interior of the accommodating chamber 11 through the oil inlet 12 together with the lubricating oil, and become gaseous. For this part of the cooling liquid, a pressure detection module 36 is provided in the accommodating chamber 11. When the pressure detection module 36 detects that the pressure in the accommodating chamber 11 rises to a certain value, the separation valve 321 is controlled to open, and the connecting pipeline 32 where the separation valve 321 is located connects the gaseous refrigerant in the accommodating chamber 11 to the separation part 31 on the balancing structure 3 to return it to the refrigeration system; when the pressure in the oil tank decreases, the separation valve 321 controls the separation valve 321 to close.

[0031] In the fuel tank structure of this embodiment, see Figure 1 The return oil tank 33 is provided with a liquid level detection module 35, which is used to detect the liquid level height in the return chamber 331; the liquid level detection module 35 is connected to the second valve 341 by signal, and the liquid level detection module 35 is used to control the switch of the second valve 341. In this way, the return oil valve 341 is provided on the return pipeline 34, and the on and off of the return oil valve 341 is controlled by the liquid level detection module 35. With the long-term operation of the chiller, the lubricating oil in the reflux chamber 331 will gradually increase. When the lubricating oil is full to the highest liquid level set by the liquid level detection module 35, the lubricating oil reaches a certain capacity. At this time, the return oil valve 341 will open, and this part of the lubricating oil that has penetrated into the refrigeration system will flow back to the accommodating chamber 11 through the return pipe 34; when the lubricating oil level is lower than the lowest liquid level set by the liquid level detection module 35, the return oil valve 341 will be controlled to close, so as to ensure that the lubricating oil in the reflux chamber 331 forms a liquid seal with the accommodating chamber 11, and the refrigerant entering the reflux chamber 331 will not enter the accommodating chamber 11, which is a cavity close to a closed loop, to prevent a sharp increase in the oil tank pressure.

[0032] Preferably, there are two liquid level detection modules 35, one is set at the highest liquid level to detect whether the liquid level in the return oil tank 33 reaches the highest liquid level, and the other is set at the lowest liquid level to detect whether the liquid level in the return oil tank 33 reaches the lowest liquid level.

[0033] In the fuel tank structure of this embodiment, see Figure 1The oil return tank 33 is provided with an oil return port 332, which is used for the refrigerant to carry the oil back into the oil return tank 33. In this way, the lubricating oil that penetrates into the refrigeration system during the long-term operation of the chiller flows back into the oil return tank 33 from the oil return port 332 along with the gaseous refrigerant through the refrigerant injection, and the gaseous refrigerant returns to the refrigeration system through the separation part 31, while the oil remains at the bottom of the oil return tank 33, and re-enters the accommodating chamber 11 through the return pipe 34 after a period of time.

[0034] In the fuel tank structure of this embodiment, see Figure 1 The oil tank structure also includes: a cooling box 4, which is sleeved on the outside of the oil storage tank 1, and a cooling chamber 41 is provided between the cooling box 4 and the oil storage tank 1, and the cooling chamber 41 is used to contain cooling liquid; the cooling liquid is used to absorb the heat of the oil; a liquid inlet 42 connected to the cooling chamber 41 is provided on one side of the cooling box 4, and a liquid outlet 43 connected to the cooling chamber 41 is provided on the side of the cooling box 4 away from the liquid inlet; the cooling liquid in the cooling chamber 41 flows from the liquid inlet 42 to the liquid outlet 43. In this way, the cooling liquid flowing in the cooling chamber 41 can take away more heat, making the cooling effect more obvious.

[0035] Specifically, the present embodiment no longer uses conventional direct contact cooling with cooling liquid for cooling the oil, but uses the coolant in the cooling chamber 41 for indirect heat exchange cooling. The coolant can be water or other liquids, avoiding direct contact. In this way, the oil is placed in a closed containing chamber 11, and the pressure in the containing chamber 11 will no longer increase due to the volatilization of a large amount of cooling liquid. The pressure in the containing chamber 11 is constant, which can ensure that the oil can normally return to the containing chamber 11 through the oil inlet 12 for cooling.

[0036] In the fuel tank structure of this embodiment, see Figure 1 The oil tank structure also includes: a temperature detection module 5, which is arranged in the accommodating chamber 11 and is used to detect the temperature of the oil in the accommodating chamber 11; a liquid supply module, which is connected to the liquid inlet 42; the liquid supply module is connected to the temperature detection module by signal, and the liquid supply module adjusts the liquid supply speed of the cooling liquid according to the detection result of the temperature detection module 5. In this way, the temperature detection module 5 is arranged in the accommodating chamber 11, which is used to control the flow rate of the cooling liquid in the cooling chamber 41, and the temperature of the oil in the accommodating chamber 11 is adjusted by the flow rate of the cooling liquid, so as to maintain the temperature within a suitable range.

[0037] In the fuel tank structure of this embodiment, see Figure 1 The oil tank structure also includes a cooling protrusion 2, which is protruding from the inner wall of the oil tank 1; the cooling protrusion 2 is in contact with the oil in the accommodating cavity 11, and the cooling protrusion 2 is used to conduct heat of the oil. In this way, the setting of the cooling protrusion 2 increases the heat conduction area, making the cooling effect more significant.

[0038] In the fuel tank structure of this embodiment, see Figure 1 The cooling protrusion 2 has a cooling groove 21, which is connected to the cooling cavity 41 and is used to contain cooling liquid. In this way, the cooling groove 21 is provided in the cooling protrusion 2, so that the cooling liquid can flow through the cooling protrusion 2, thereby increasing the contact area between the cooling liquid and the oil, and making the cooling effect more obvious.

[0039] In the fuel tank structure of this embodiment, see Figure 1 There are multiple cooling protrusions 2, and the multiple cooling protrusions 2 are arranged in the accommodating cavity 11 at intervals. In this way, by arranging multiple cooling protrusions 2 in the accommodating cavity 11, the contact area of ​​the cooling oil can be further increased, thereby enhancing the cooling effect.

[0040] Preferably, the cooling protrusion 2 is a sheet-like structure.

[0041] Preferably, there are three or more cooling protrusions 2.

[0042] In the fuel tank structure of this embodiment, see Figure 2 The cooling protrusion 2 is provided with a plurality of circulation channels 22, and the circulation channels 22 are used for oil to pass through. In this way, the cooling protrusion 2 of the sheet structure is provided with a plurality of circulation channels 22, which facilitates the oil to circulate in the accommodating cavity 11.

[0043] This embodiment provides an oil return system, including: an oil tank structure; a circulation pipeline, the circulation pipeline is connected to the oil inlet 12 and the oil return port 332, and the oil tank is used to collect the oil in the circulation pipeline. In this way, the high-temperature oil from the compressor bearing after lubrication flows through the oil return pipeline and enters the accommodating chamber 11 through the oil inlet 12.

[0044] In the prior art, the oil tank used for the chiller is provided with a box body, and a cooling port is provided on the side of the box body. The cooling port will spray cooling liquid into the oil tank to cool the lubricating oil by heat exchange. After absorbing heat, the cooling liquid will become gaseous and remain in the oil tank, and the pressure in the oil tank will increase. In addition, such cooling liquid spray cooling can generally only cool the surface of the lubricating oil, and the cooling of the lubricating oil is not sufficient. The lubricating oil in the oil return port comes from the high-temperature oil after lubricating the compressor bearing. Since the lubricating oil pressure in the oil return port is certain, the pressure in the oil tank increases, resulting in the lubricating oil being unable to flow back to the oil tank for cooling. The cooled lubricating oil is supplied to the bearing cavity through an oil pump to lubricate the bearing. At the same time, some oil that penetrates into the refrigeration system will use the pressure difference between the cooling liquid as a power source to return to the oil tank through the injection return oil port, so the cooling liquid and some mixture will come in from the injection return oil port, and the cooling liquid will also become gaseous, so that the pressure in the oil tank cavity is further increased. Even if the oil tank is provided with a balance port, connected to the suction end of the compressor to reduce the pressure in the oil tank cavity, the lubricating oil in the oil return port can flow into the oil tank normally, but due to the effect of the pressure difference, the gaseous refrigerant and mist oil droplets inside the oil tank will be sucked away along the balance pipe, which will cause oil leakage. The oil tank of this embodiment adopts an integral structure combining an oil storage tank 1 and a balance structure 3. The lubricating oil in the oil storage tank 1 is cooled by heat exchange with the coolant in the cooling cavity 41. The coolant and the lubricating oil are not in direct contact, which solves the problem of a sharp increase in pressure in the accommodating cavity 11 due to cooling and evaporation of the cooling liquid, and solves the problem of difficulty in returning the lubricating oil that penetrates into the refrigeration system and the phenomenon of lubricating oil leakage through the balance port.

[0045] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0046] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0047] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0048] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0049] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A fuel tank structure, characterized in that: include: An oil storage tank (1), the oil storage tank (1) having a containing chamber (11), the containing chamber (11) being used to contain oil, the containing chamber (11) having an oil inlet (12), the oil inlet (12) being used to allow the oil to enter the containing chamber (11); A balancing structure (3), wherein the balancing structure (3) comprises a separation part (31) and an oil return tank (33), wherein the separation part (31) is used to separate the oil carried by the refrigerant; the separation part (31) is connected to the oil return tank (33), and the oil return tank (33) comprises an oil return pipeline (34); the oil return pipeline (34) is connected to the accommodating chamber (11), and an oil return valve (341) is provided on the oil return pipeline (34), and the oil return valve (341) is used to control the on-off of the oil return pipeline (34).

2. The fuel tank structure according to claim 1, characterized in that: The separation unit (31) comprises: A separation chamber (310), wherein the separation chamber (310) is in communication with the accommodating chamber (11) and the oil return tank (33); An exhaust pipeline (311), the exhaust pipeline (311) being in communication with the top of the separation chamber (310), and the exhaust pipeline (311) being used for allowing gas to be discharged from the separation chamber (310); A separation plate body (312), wherein there are a plurality of separation plate bodies (312), and the plurality of separation plate bodies (312) are arranged in the separation chamber (310) at intervals, and the separation plate body (312) is used for the oil entering the separation chamber (310) to adhere to.

3. The fuel tank structure according to claim 2, characterized in that: The separation part (31) comprises a connecting pipeline (32), wherein the connecting pipeline (32) connects the accommodating chamber (11) and the separation chamber (310), and a separation valve (321) is arranged in the connecting pipeline (32), and the separation valve (321) is used to control the opening and closing of the connecting pipeline (32); A pressure detection module (36) is provided in the accommodating chamber (11), and the pressure detection module (36) is used to detect the pressure in the accommodating chamber (11); The separation valve (321) is signal-connected to a pressure detection module (36), and the pressure detection module (36) is used to control the switch of the separation valve (321).

4. The fuel tank structure according to claim 1, characterized in that: A liquid level detection module (35) is provided in the oil return tank (33), and the liquid level detection module (35) is used to detect the liquid level height in the oil return tank (33); The liquid level detection module (35) is connected to the oil return valve (341) by signal, and the liquid level detection module (35) is used to control the switch of the oil return valve (341).

5. The fuel tank structure according to claim 1, characterized in that: The oil return tank (33) is provided with an oil return port (332), and the oil return port (332) is used for the refrigerant to carry the oil back into the oil return tank (33).

6. The fuel tank structure according to claim 1, characterized in that: The fuel tank structure also includes: A cooling box (4), wherein the cooling box (4) is sleeved on the outside of the oil storage tank (1), and a cooling cavity (41) is provided between the cooling box (4) and the oil storage tank (1), wherein the cooling cavity (41) is used to contain cooling liquid; the cooling liquid is used to absorb the heat of the oil; a liquid inlet (42) communicating with the cooling cavity (41) is provided on one side of the cooling box (4), and a liquid outlet (43) communicating with the cooling cavity (41) is provided on a side of the cooling box (4) away from the liquid inlet; the cooling liquid in the cooling cavity (41) flows from the liquid inlet (42) to the liquid outlet (43).

7. The fuel tank structure according to claim 6, characterized in that: The fuel tank structure also includes: A temperature detection module (5), the temperature detection module (5) being arranged in the accommodating chamber (11), the temperature detection module (5) being used to detect the temperature of the oil in the accommodating chamber (11); A liquid supply module, the liquid supply module is in communication with the liquid inlet (42); the liquid supply module is signal-connected to the temperature detection module, and the liquid supply module adjusts the liquid supply speed of the cooling liquid according to the detection result of the temperature detection module (5).

8. The fuel tank structure according to claim 6, characterized in that: The fuel tank structure also includes: A cooling protrusion (2), wherein the cooling protrusion (2) is arranged to protrude from the inner wall of the oil storage tank (1); the cooling protrusion (2) is in contact with the oil in the accommodating cavity (11), and the cooling protrusion (2) is used to conduct heat of the oil; the cooling protrusion (2) has a cooling groove (21), the cooling groove (21) is connected to the cooling cavity (41), and the cooling groove (21) is used to accommodate the cooling liquid.

9. The fuel tank structure according to claim 8, characterized in that: There are a plurality of cooling protrusions (2), and a plurality of cooling structures are arranged in the accommodating cavity (11) at intervals.

10. The fuel tank structure according to claim 8, characterized in that: A plurality of circulation channels (22) are provided on the cooling protrusion (2), and the circulation channels (22) are used for allowing the oil to pass through.

11. An oil return system, characterized in that: include: The fuel tank structure according to any one of claims 1 to 10; A circulation pipeline, the circulation pipeline is used for circulating the refrigerant, the circulation pipeline is connected to the oil inlet (12) and the oil return port (332), and the oil tank structure is used to collect the oil in the circulation pipeline.

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