Air compressor heat recovery system

Abstract

The utility model discloses a heat recovery system of an air compressor, which comprises a compressor assembly comprising a compressor head, an air outlet of the compressor head is connected with an air supply main pipe, and a lubricating oil cavity of the compressor head is communicated with an oil cut-off valve; the oil-gas separator is provided with a first connector, a second connector, a third connector and a fourth connector, the first connector is connected with the gas supply main pipe, the second connector is connected with a gas supply branch pipe, the third connector is connected with an oil temperature control valve, and the fourth connector is connected with the oil cut-off valve through a first oil return pipe; the oil temperature control valve is connected with the oil cut-off valve through a first oil supply pipe; the plate exchanger is connected with an oil inlet pipe, an oil outlet pipe, a water inlet pipe and a water outlet pipe, the oil inlet pipe and the oil outlet pipe are both connected with the oil temperature control valve, and cooling water enters the plate exchanger from the water inlet pipe and flows out from the water outlet pipe. According to the heat recovery system of the air compressor, high temperature generated in the operation process of the air compressor can be recovered, and the temperature of lubricating oil of the air compressor can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heat recovery, in particular to a heat recovery system for an air compressor. Background Art

[0002] The air compressor will generate high temperature when compressing air, which will cause the temperature of the lubricating oil in the air compressor to rise, thus affecting the service life of the air compressor. Currently, the high-temperature energy generated during the operation of the air compressor is often wasted, which not only causes a large environmental load, but also increases the ambient temperature in the factory, causing a decrease in the comfort of the operators. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes an air compressor heat recovery system, which can recover the high temperature generated during the operation of the air compressor and reduce the lubricating oil temperature of the air compressor, effectively extending the service life of the air compressor, reducing the environmental load, and improving the comfort of the operators.

[0004] The air compressor heat recovery system according to the embodiment of the utility model comprises:

[0005] The compressor assembly comprises a compressor head, wherein the air outlet of the compressor head is connected to an air supply main pipe, the lubricating oil chamber of the compressor head is connected to an oil cut-off valve, and the lubricating oil in the lubricating oil chamber can flow in both directions with the oil cut-off valve;

[0006] An oil-gas separator is used to separate gas and liquid from compressed air; the oil-gas separator has a first joint, a second joint, a third joint and a fourth joint, the first joint is connected to the air supply main pipe, the second joint is connected to an air supply branch pipe, and the air supply branch pipe is used to supply compressed air to the outside; the third joint is connected to an oil temperature control valve, and the oil-gas separator delivers lubricating oil to the oil temperature control valve through the third joint; the fourth joint is connected to the oil cut-off valve through a first oil return pipe; the oil temperature control valve is connected to the oil cut-off valve through a first oil supply pipe;

[0007] The plate heat exchanger is connected with an oil inlet pipe, an oil outlet pipe, a water inlet pipe and a water outlet pipe. The oil inlet pipe and the oil outlet pipe are both connected to the oil temperature control valve. Cooling water enters the plate heat exchanger from the water inlet pipe and flows out from the water outlet pipe.

[0008] The air compressor heat recovery system according to the embodiment of the utility model has at least the following beneficial effects:

[0009] By setting up a plate exchanger to cool the lubricating oil of the compressor head, the heat of the lubricating oil can be used to heat the cooling water, thereby realizing the recovery of high-temperature heat. The cooling water can be used as domestic water, which effectively reduces energy waste, reduces the environmental load and the ambient temperature of the plant, and thus improves the comfort of the operators; by cooling the lubricating oil, the high-temperature loss of the air compressor is also effectively reduced, extending the service life of the air compressor.

[0010] According to some embodiments of the utility model, the oil temperature control valve has a first main interface, a second main interface, a first bypass interface, and a second bypass interface, the first main interface is connected to the third joint through an oil supply main pipe, the second main interface is connected to the first oil supply pipe, the first bypass interface is connected to the oil inlet pipe, and the second bypass interface is connected to the oil outlet pipe;

[0011] The first main interface, the second main interface, the first bypass interface, and the second bypass interface all have two states: open and closed.

[0012] According to some embodiments of the present utility model, the oil supply main pipe is installed with an oil filter.

[0013] According to some embodiments of the utility model, the oil cut-off valve has an interface 1, an interface 2, an interface 3 and an interface 4, the interface 1 is connected to the first oil supply pipe, the interface 2 is connected to the compressor head and is used to supply lubricating oil to the compressor head, the interface 3 is connected to the compressor head through a second oil return pipe and is used to supply lubricating oil in the compressor head, and the interface 4 is connected to the oil-gas separator through the first oil return pipe;

[0014] The interface 1, the interface 2, the interface 3 and the interface 4 all have two states: open and closed.

[0015] According to some embodiments of the utility model, the air compressor heat recovery system further includes an exhaust fan, the oil outlet pipe is installed with a second cooler, and the exhaust fan is used to dissipate heat to the second cooler.

[0016] According to some embodiments of the utility model, the oil temperature control valve is provided with an oil temperature detector, and the oil temperature detector is used to detect the oil temperature at the second bypass interface; the oil temperature detector is provided with a high temperature setting value and a low temperature setting value;

[0017] When the actual oil temperature detected by the oil temperature detector is higher than the high temperature setting value, starting the exhaust fan;

[0018] When the actual oil temperature detected by the oil temperature detector is lower than the low temperature setting value, the exhaust fan is stopped.

[0019] According to some embodiments of the utility model, the air supply branch pipe is installed with a first cooler, and the exhaust fan can dissipate heat for the first cooler.

[0020] According to some embodiments of the utility model, the oil-gas separator is installed with an oil pump, and the oil pump outlet is connected to the third joint; the oil pump is used to pump out the lubricating oil in the oil-gas separator through the third joint.

[0021] According to some embodiments of the present utility model, the oil-gas separator is equipped with a safety valve and an oil level sensor.

[0022] According to some embodiments of the present utility model, an air filter is provided at the air inlet of the compressor head.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0025] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0026] Figure 2 for Figure 1 A schematic diagram of the structure of the oil-gas separator;

[0027] Figure 3 for Figure 1 The structural diagram of the oil temperature control valve in FIG.

[0028] Figure 4 for Figure 1 Schematic diagram of the structure of the oil cut-off valve.

[0029] Figure Number:

[0030] Compressor assembly 100, compressor head 110, air supply main 111, air filter 112, motor 120;

[0031] Oil-gas separator 200, first joint 210, second joint 220, gas supply branch pipe 221, first cooler 222, third joint 230, fourth joint 240, oil pump 250, safety valve 260, oil level sensor 270;

[0032] The oil temperature control valve 300, the first main interface 310, the oil supply main pipe 311, the oil filter 312, the second main interface 320, the first oil supply pipe 321, the first bypass interface 330, and the second bypass interface 340;

[0033] Oil cut-off valve 400, interface 1 410, interface 2 420, second oil supply pipe 421, interface 3 430, second oil return pipe 431, interface 4 440, first oil return pipe 441;

[0034] Plate exchanger 500, oil inlet pipe 510, oil outlet pipe 520, second cooler 521, water inlet pipe 530, water outlet pipe 540;

[0035] Exhaust fan 600. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] In the description of the present invention, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In the description of the present utility model, "a plurality" means more than two. If there is a description of "first" or "second", it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0039] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0040] Reference Figures 1 to 4A heat recovery system for an air compressor according to an embodiment of the utility model comprises a compressor assembly 100, an oil-gas separator 200, a plate exchanger 500, an exhaust fan 600, a second cooler 521, an oil temperature control valve 300 and an oil shut-off valve 400. The compressor assembly 100 is used to produce compressed air, and the oil-gas separator 200 is used to separate gas and liquid from the compressed air; the plate exchanger 500 and the second cooler 521 are both used to cool the lubricating oil, the plate exchanger 500 cools the lubricating oil by water cooling, the second cooler 521 cools the lubricating oil by air cooling, and the exhaust fan 600 is used to dissipate heat from the second cooler 521; a plurality of lubricating oil pipelines are connected between the compressor assembly 100, the oil-gas separator 200 and the plate exchanger 500, and the oil temperature control valve 300 and the oil shut-off valve 400 are used to connect a plurality of pipelines to control the flow direction of the lubricating oil.

[0041] Specifically, refer to Figure 1 As shown, the compressor assembly 100 includes a compressor head 110 and a motor 120. The motor 120 drives the compressor head 110 to rotate so as to generate compressed air. The compressor head 110 has an air inlet and an exhaust port. An air filter 112 is provided at the air inlet to prevent impurities in the air from entering the compressor head 110 and damaging the compressor head 110. The exhaust port is connected to the oil-gas separator 200 through the air supply main pipe 111 to deliver the compressed air to the oil-gas separator 200. The compressor head 110 has a lubricating oil chamber, which contains lubricating oil. The compressed air delivered to the oil-gas separator 200 by the compressor head 110 will contain moisture in the air and part of the lubricating oil that enters the compressed air. Therefore, the compressed air needs to be separated from the gas and liquid before being supplied to the outside, so as to prevent moisture and oil in the compressed air from damaging the equipment.

[0042] Reference Figure 2 As shown, the oil-gas separator 200 has a first joint 210, a second joint 220, a third joint 230 and a fourth joint 240. The first joint 210 is connected to the air supply main pipe 111, and the first joint 210 is connected to the exhaust port of the compressor head 110 through the air supply main pipe 111; the second joint 220 is connected to the air supply branch pipe 221, and the air supply branch pipe 221 is used to supply compressed air to the outside; the third joint 230 is connected to the oil temperature control valve 300, and the oil-gas separator 200 conveys lubricating oil to the oil temperature control valve 300 through the third joint 230, and the third joint 230 is connected to the oil temperature control valve 300 through the oil supply main pipe 311; the fourth joint 240 is connected to the oil shut-off valve 400 through the first oil return pipe 441; the oil temperature control valve 300 is connected to the oil shut-off valve 400 through the first oil supply pipe 321. The oil-gas separator 200 is installed with an oil pump 250 , and the outlet of the oil pump 250 is connected to the third joint 230 ; the oil pump 250 is used to pump out the lubricating oil in the oil-gas separator 200 through the third joint 230 .

[0043] In the embodiments of the present invention, referring to Figure 3 As shown, the oil temperature control valve 300 has a first main interface 310, a second main interface 320, a first bypass interface 330, and a second bypass interface 340. The first main interface 310 is connected to the third joint 230 through the oil supply main pipe 311, the second main interface 320 is connected to the first oil supply pipe 321, the first bypass interface 330 is connected to the oil inlet pipe 510, and the second bypass interface 340 is connected to the oil outlet pipe 520; the first main interface 310, the second main interface 320, the first bypass interface 330, and the second bypass interface 340 all have two states of opening and closing. The oil temperature control valve 300 can change the flow direction of the lubricating oil by controlling the switching of the first main interface 310, the second main interface 320, the first bypass interface 330, and the second bypass interface 340 between the two states.

[0044] In an embodiment of the utility model, the oil shut-off valve 400 has an interface 1 410, an interface 2 420, an interface 3 430 and an interface 4 440. The interface 1 410 is connected to the first oil supply pipe 321, the interface 2 420 is connected to the compressor head 110, and is used to supply lubricating oil to the compressor head 110. The interface 3 430 is connected to the compressor head 110 through the second oil return pipe 431, and is used to supply lubricating oil in the compressor head 110. The interface 440 is connected to the oil-gas separator 200 through the first oil return pipe 441; the interface 1 410, the interface 2 420, the interface 3 430 and the interface 4 440 all have two states of open and closed. By controlling the interface 1 410, the interface 2 420, the interface 3 430 and the interface 4 440 to switch between the two states, the flow direction of the lubricating oil can be controlled.

[0045] In the embodiments of the present invention, referring to Figure 1 As shown, the plate changer 500 is connected with an oil inlet pipe 510, an oil outlet pipe 520, a water inlet pipe 530 and a water outlet pipe 540. The oil inlet pipe 510 and the oil outlet pipe 520 are both connected to the oil temperature control valve 300. The cooling water enters the plate changer 500 from the water inlet pipe 530 and flows out from the water outlet pipe 540. The oil temperature control valve 300 can control the lubricating oil to enter the plate changer 500 from the oil inlet pipe 510, and then the lubricating oil is cooled by the cooling water in the plate changer 500 and flows out from the oil outlet pipe 520 and flows back to the oil temperature control valve 300. Then, the oil temperature control valve 300 can control whether the oil in the oil outlet pipe 520 flows back into the plate changer 500 or enters the first oil supply pipe 321 through the second main interface 320 and then flows into the oil cut-off valve 400 according to the temperature of the oil outlet pipe 520.

[0046] Furthermore, in the embodiment of the present utility model, the oil supply main pipe 311 is installed with an oil filter 312 to prevent impurities in the lubricating oil from entering the oil temperature control valve 300 and causing damage to the oil temperature control valve 300 .

[0047] In the embodiment of the utility model, the oil temperature control valve 300 is provided with an oil temperature detector, which is used to detect the oil temperature at the second bypass interface 340; the oil temperature detector is provided with a high temperature setting value and a low temperature setting value; when the actual oil temperature detected by the oil temperature detector is higher than the high temperature setting value, the exhaust fan 600 is started; when the actual oil temperature detected by the oil temperature detector is lower than the low temperature setting value, the exhaust fan 600 is stopped. Specifically, the lower the oil temperature of the lubricating oil, the better, so the lubricating oil also needs to be controlled within a suitable temperature range; when the plate exchanger 500 is not working, the second cooler 521 alone can reduce the lubricating oil temperature to a suitable temperature range, but it cannot reduce the lubricating oil temperature below the low temperature setting value; but when the plate exchanger 500 is working, the plate exchanger 500 can reduce the oil temperature to below the low temperature setting value, so the low temperature setting value is still higher than the minimum value of the suitable temperature range of the lubricating oil, and the high temperature setting value is preferably lower than the maximum value of the suitable temperature range of the lubricating oil.

[0048] It should be understood that when the actual oil temperature detected by the oil temperature detector is higher than the high temperature setting value, the operation of the oil pump 250 will be stopped while the exhaust fan 600 is started.

[0049] The working principle of the air compressor heat recovery system of this embodiment is as follows:

[0050] The compressor assembly 100 delivers the compressed air to the oil-gas separator 200 through the air supply main pipe 111. The oil-gas separator 200 performs gas-liquid separation on the compressed air. The oil-gas separator 200 separates the lubricating oil from the compressed air by means of centrifugal force. Then, the compressed air from which the lubricating oil has been separated is supplied to the outside through the air supply branch pipe 221. In order to fully utilize the heat dissipation effect of the exhaust fan 600, the air supply branch pipe 221 may also be provided with a first cooler 222 to cool the compressed air in the air supply branch pipe 221. The first cooler 222 also dissipates heat through the exhaust fan 600.

[0051] Furthermore, the lubricating oil separated in the oil-gas separator 200 will flow to the bottom of the oil-gas separator 200, and then the oil pump 250 at the bottom of the oil-gas separator 200 will let the lubricating oil enter the oil supply pipe 311 through the third joint 230, and then enter the oil temperature control valve 300 through the first main interface 310 of the oil temperature control valve 300 after being filtered by the oil filter 312 installed on the oil supply pipe 311. The oil temperature control valve 300 will detect the oil temperature at the first main interface 310. If the oil temperature is too high, the oil temperature control valve 300 controls the lubricating oil to enter the oil inlet pipe 510 through the first bypass interface 330, and then enter the plate exchanger 500 for cooling; if the oil temperature is within the normal range, the oil temperature control valve 300 controls the lubricating oil to directly enter the first oil supply pipe 321 through the second main interface 320. As can be seen from the above, the lower the temperature of the lubricating oil is, the better it is. The lubricating oil also needs to be controlled within an appropriate temperature range. Therefore, the lubricating oil within the appropriate temperature range does not need to enter the plate exchanger 500 for cooling.

[0052] Furthermore, the lubricating oil entering the plate changer 500 may not necessarily be cooled to a suitable temperature, because the plate changer 500 cools the lubricating oil by cooling water. When the temperature of the cooling water rises to a higher range, the plate changer 500 may not be able to cool the lubricating oil to a suitable temperature. Therefore, it is necessary to detect the temperature of the lubricating oil entering the oil temperature control valve 300 through the oil outlet pipe 520 and the second bypass interface 340, and it is also necessary to set a second cooler 521 on the oil outlet pipe 520 to cool the lubricating oil. Under normal circumstances, the exhaust fan 600 is in a stopped state. When the oil temperature detector detects that the temperature of the lubricating oil entering the oil temperature control valve 300 through the oil outlet pipe 520 and the second bypass interface 340 is still too high, it means that the plate exchanger 500 can no longer achieve a sufficient cooling effect. Therefore, it is necessary to start the exhaust fan 600 to assist in cooling the lubricating oil. At the same time, the oil pump 250 will also be stopped. The lubricating oil then re-enters the oil inlet pipe 510 through the first bypass interface 330 and is cooled through the second cooler 521 of the oil outlet pipe 520 until the oil temperature detector detects that the oil temperature reaches below the high temperature setting value. The oil pump 250 is then restarted, and the oil temperature control valve 300 controls the lubricating oil to enter the first oil supply pipe 321 through the second main interface 320.

[0053] In an embodiment of the utility model, the heat exchange efficiency of the plate exchanger 500 is higher than that of the second cooler 521, so the plate exchanger 500 can reduce the oil temperature of the lubricating oil to below the low temperature setting value. When the oil temperature detector detects that the oil temperature is lower than the low temperature setting value, it means that the plate exchanger 500 is working again. At this time, there is no need to cool the lubricating oil through the exhaust fan 600 and the second cooler 521. Therefore, the exhaust fan 600 can be stopped at this time, and the lubricating oil can be cooled only by the plate exchanger 500.

[0054] In an embodiment of the utility model, the compressor head 110 has a lubricating oil chamber. When the amount of lubricating oil in the lubricating oil chamber is insufficient, the oil shut-off valve 400 opens interface two 420, so that the lubricating oil is supplied to the compressor head 110 through the second oil supply pipe 421; when the amount of lubricating oil in the lubricating oil chamber is within a normal range, the oil shut-off valve 400 opens interface four 440, so that the lubricating oil flows into the oil-gas separator 200 through the first oil return pipe 441; when the amount of lubricating oil in the lubricating oil chamber is excessive, the oil shut-off valve 400 closes interface two 420, opens interface three 430 and interface four 440, so that the lubricating oil flows into the oil shut-off valve 400 through the second oil return pipe 431, and then flows into the oil-gas separator 200 through the first oil return pipe 441.

[0055] In an embodiment of the utility model, the oil-gas separator 200 is installed with a safety valve 260 and an oil level sensor 270. Specifically, the safety valve 260 is used to prevent the oil-gas separator 200 from being damaged by excessive pressure, and the oil level sensor 270 is used to detect the lubricating oil level in the oil-gas separator 200. If the lubricating oil level in the oil-gas separator 200 is too low, the oil level sensor 270 will sound an alarm to remind the staff to add lubricating oil.

[0056] The air compressor heat recovery system of the embodiment of the utility model cools the lubricating oil of the compressor head 110 by arranging a plate exchanger 500, and can heat cooling water by the heat of the lubricating oil, thereby realizing the recovery of high-temperature heat. The cooling water can be used as domestic water, thereby effectively reducing energy waste, reducing environmental load and the ambient temperature of the factory, and thus improving the comfort of operators; by cooling the lubricating oil, the high-temperature loss of the air compressor is also effectively reduced, and the service life of the air compressor is extended.

[0057] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0058] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. An air compressor heat recovery system, characterized in that: include: The compressor assembly comprises a compressor head, wherein the air outlet of the compressor head is connected to an air supply main pipe, the lubricating oil chamber of the compressor head is connected to an oil cut-off valve, and the lubricating oil in the lubricating oil chamber can flow in both directions with the oil cut-off valve; An oil-gas separator is used to separate gas and liquid from compressed air; the oil-gas separator has a first joint, a second joint, a third joint and a fourth joint, the first joint is connected to the air supply main pipe, the second joint is connected to an air supply branch pipe, and the air supply branch pipe is used to supply compressed air to the outside; the third joint is connected to an oil temperature control valve, and the oil-gas separator delivers lubricating oil to the oil temperature control valve through the third joint; the fourth joint is connected to the oil cut-off valve through a first oil return pipe; the oil temperature control valve is connected to the oil cut-off valve through a first oil supply pipe; The plate heat exchanger is connected with an oil inlet pipe, an oil outlet pipe, a water inlet pipe and a water outlet pipe. The oil inlet pipe and the oil outlet pipe are both connected to the oil temperature control valve. Cooling water enters the plate heat exchanger from the water inlet pipe and flows out from the water outlet pipe.

2. The air compressor heat recovery system according to claim 1, characterized in that: The oil temperature control valve has a first main interface, a second main interface, a first bypass interface, and a second bypass interface, wherein the first main interface is connected to the third joint via an oil supply main pipe, the second main interface is connected to the first oil supply pipe, the first bypass interface is connected to the oil inlet pipe, and the second bypass interface is connected to the oil outlet pipe; The first main interface, the second main interface, the first bypass interface, and the second bypass interface all have two states: open and closed.

3. The air compressor heat recovery system according to claim 2, characterized in that: The oil supply main pipe is equipped with an oil filter.

4. The air compressor heat recovery system according to claim 1, characterized in that: The oil cut-off valve has an interface 1, an interface 2, an interface 3 and an interface 4, wherein the interface 1 is connected to the first oil supply pipe, the interface 2 is connected to the compressor head for supplying lubricating oil to the compressor head, the interface 3 is connected to the compressor head through a second oil return pipe for allowing the lubricating oil in the compressor head to flow out, and the interface 4 is connected to the oil-gas separator through the first oil return pipe; The interface 1, the interface 2, the interface 3 and the interface 4 all have two states: open and closed.

5. The air compressor heat recovery system according to claim 2, characterized in that: The air compressor heat recovery system also includes an exhaust fan, the oil outlet pipe is installed with a second cooler, and the exhaust fan is used to dissipate heat to the second cooler.

6. The air compressor heat recovery system according to claim 5, characterized in that: The oil temperature control valve is provided with an oil temperature detector, and the oil temperature detector is used to detect the oil temperature at the second bypass interface; the oil temperature detector is provided with a high temperature setting value and a low temperature setting value; When the actual oil temperature detected by the oil temperature detector is higher than the high temperature setting value, starting the exhaust fan; When the actual oil temperature detected by the oil temperature detector is lower than the low temperature setting value, the exhaust fan is stopped.

7. The air compressor heat recovery system according to claim 5, characterized in that: The air supply branch pipe is installed with a first cooler, and the exhaust fan can dissipate heat for the first cooler.

8. The air compressor heat recovery system according to claim 1, characterized in that: The oil-gas separator is equipped with an oil pump, and the oil pump outlet is connected to the third joint; the oil pump is used to pump out the lubricating oil in the oil-gas separator through the third joint.

9. The air compressor heat recovery system according to claim 1, characterized in that: The oil-gas separator is equipped with a safety valve and an oil level sensor.

10. The air compressor heat recovery system according to claim 1, characterized in that: The air inlet of the compressor head is provided with an air filter.

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