Air compressor waste heat recovery system

Abstract

The utility model provides a kind of air compressor waste heat recovery system, by being equipped with air compressor, heat energy recovery device, circulating water tank, circulating water pump, user water tank, hot feed water pump and hot feed water solenoid valve, heat energy recovery device is connected with air compressor pipeline, circulating water tank is connected with heat energy recovery device pipeline, circulating water pump is located in the pipeline structure between circulating water tank and heat energy recovery device, user water tank is connected with circulating water tank pipeline, and pipeline structure between user water tank and circulating water tank is equipped with long distance hot feed water pipe and hot feed water circulating water pipe, one end of long distance hot feed water pipe is connected with circulating water tank, the other end of long distance hot feed water pipe is connected with user water tank, one end of hot feed water circulating water pipe is connected with circulating water tank, the other end of hot feed water circulating water pipe is connected with long distance hot feed water pipe, hot feed water pump and hot feed water solenoid valve are located in long distance hot feed water pipe, and then improve the heat recovery efficiency of air compressor, ensure the water supply temperature and heat supply efficiency of hot feed water.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery from air compressors, and in particular to a waste heat recovery system for air compressors. Background Technology

[0002] Waste heat recovery from air compressors involves recovering the heat generated during the operation of an air compressor through a heat recovery device and converting it into hot water, hot air, etc., for use in industrial production, employee living, factory heating, industrial heating, agricultural greenhouse heating, etc., thereby achieving the goals of reducing energy consumption, reducing environmental pollution, improving production efficiency, and extending equipment life.

[0003] Waste heat recovery from air compressors is now widely used, and different systems can be configured based on the air compressor's cooling method, different operating environments, different usage purposes, and control requirements. However, existing technologies have the following drawbacks: most waste heat recovery systems are only suitable for local use, have low heat recovery efficiency, and cannot ensure the supply water temperature and heating efficiency for extended periods; small-scale constant-pressure water supply systems result in long-term high-temperature and high-pressure conditions in the hot water supply pipes, leading to frequent pump start-ups and shutdowns; the initial hot water temperature at the end of the hot water supply pipe is relatively low; and the heating efficiency of cold water replenishment is not high. Utility Model Content

[0004] The main objective of this utility model embodiment is to propose an air compressor waste heat recovery system that can automatically recover the waste heat of the air compressor and continuously heat the water supplied to users, thereby improving the heat recovery efficiency and ensuring the supply temperature and heating efficiency of the hot water.

[0005] To achieve the above objectives, a first aspect of this utility model provides an air compressor waste heat recovery system, comprising:

[0006] Air compressor;

[0007] A heat recovery device is connected to the air compressor pipeline and is used to receive and convert the heat from the air compressor.

[0008] The circulating water tank is connected to the heat recovery device via pipeline.

[0009] The circulating water pump is located in the pipeline structure between the circulating water tank and the heat recovery device.

[0010] The user water tank is connected to the circulating water tank by pipes. The pipe structure between the user water tank and the circulating water tank includes a long-distance hot water supply pipe and a hot water supply circulating pipe. One end of the long-distance hot water supply pipe is connected to the circulating water tank, and the other end of the long-distance hot water supply pipe is connected to the user water tank. One end of the hot water supply circulating pipe is connected to the circulating water tank, and the other end of the hot water supply circulating pipe is connected to the long-distance hot water supply pipe. A hot water circulation pipeline loop is formed between the long-distance hot water supply pipe, the hot water supply circulating pipe, and the circulating water tank.

[0011] Hot water pump, which is located in a long-distance hot water pipe and close to the circulating water tank, is used to transfer water from the circulating water tank to the user's water tank.

[0012] The hot water supply solenoid valve is located inside a long-distance hot water supply pipe and close to the user's water tank. The hot water supply pump is located inside a long-distance hot water supply pipe and close to the circulating water tank. The hot water supply solenoid valve is used to control the connection between the user's water tank and the circulating water tank.

[0013] Furthermore, in some embodiments, the system further includes:

[0014] The first controller is communicatively connected to the circulating water pump. The first controller is used to control the opening and closing of the circulating water pump to transfer the water in the circulating water tank to the heat recovery device for heating.

[0015] The second controller is connected in communication with the hot water pump and is used to control the start and stop of the hot water pump to transfer water from the circulating water tank to the user's water tank.

[0016] The third controller is communicatively connected to the second controller and the hot water solenoid valve. The third controller is used to control the opening and closing of the hot water solenoid valve.

[0017] Furthermore, in some embodiments, the circulating water tank includes a first temperature detector, a second temperature detector, and a first water level detector. The first temperature detector and the first water level detector are respectively communicatively connected to a first controller, and the second temperature detector is communicatively connected to a second controller. The first temperature detector is used to send a first temperature control signal of the circulating water tank to the first controller, the second temperature detector is used to send a second temperature control signal of the circulating water tank to the second controller, and the first water level detector is used to send a first water level signal of the circulating water tank to the first controller.

[0018] The user water tank includes a second water level detector, which is communicatively connected to a third controller. The second water level detector is used to send a second water level signal of the user water tank to the third controller, and the third controller is also used to transmit the second water level signal to the second controller.

[0019] The piping structure between the heat recovery device and the air compressor includes a high-temperature oil pipe. The high-temperature oil pipe is equipped with a third temperature detector. The third temperature detector is communicatively connected to the first controller and is used to send a third temperature control signal of the high-temperature oil pipe to the first controller.

[0020] The long-distance hot water supply pipe is also equipped with a fourth temperature detector, which is connected to the third controller. The fourth temperature detector is used to send the fourth temperature control signal of the long-distance hot water supply pipe to the third controller.

[0021] Furthermore, in some embodiments, the system also includes a cold water supply solenoid valve, one end of which is connected to the circulating water pump pipeline, and the other end of which is connected to an external water supply pipeline.

[0022] The first controller is also connected to the cold water supply solenoid valve. The first controller is also used to control the opening and closing of the cold water supply solenoid valve so that the cold water from the external water supply pipe is transmitted to the circulating water pump and then transmitted to the circulating water tank or heat recovery device through the opening and closing of the circulating water pump.

[0023] Furthermore, in some embodiments, the first controller is provided with a first control circuit, which is used to control the opening and closing of the cold water supply solenoid valve according to the first water level signal.

[0024] The first control circuit includes a first water level switch, a second water level switch, and a water supply solenoid valve coil. The first water level switch, the second water level switch, and the water supply solenoid valve coil are connected in series. The first water level switch is normally open, and the second water level switch is normally closed.

[0025] The first water level switch is used to automatically close when the first water level signal indicates that the water level in the circulating water tank is less than the first preset water level value, so that the first control circuit is turned on, and to automatically reset after the first control circuit is turned off.

[0026] The second water level switch is used to automatically disconnect when the first water level signal indicates that the water level in the circulating water tank is greater than the second preset water level value, thereby disconnecting the first control circuit, and to automatically reset after the first control circuit is disconnected; wherein, the first preset water level value is less than the second preset water level value;

[0027] The water replenishment solenoid valve coil is used to control the cold water replenishment solenoid valve to open when the first control circuit is turned on, so that cold water from the external water replenishment pipe can be transferred to the circulating water pump.

[0028] Furthermore, in some embodiments, the first controller is further provided with a second control circuit, which is used to control the start and stop of the circulating water pump according to the first temperature control signal and the third temperature control signal.

[0029] The second control circuit includes a first temperature control switch, a second temperature control switch, and a second contactor coil. The first temperature control switch, the second temperature control switch, and the second contactor coil are connected in series. The first temperature control switch is in a normally open state, and the second temperature control switch is in a normally closed state.

[0030] The first temperature control switch is used to automatically close when the third temperature control signal indicates that the oil temperature of the high-temperature oil pipe has reached the first preset temperature value and the first temperature control signal indicates that the water temperature of the circulating water tank has not reached the second preset temperature value, so that the second control circuit is turned on, and to automatically reset after the second control circuit is turned off.

[0031] The second temperature control switch is used to disconnect the second control circuit when the third temperature control signal indicates that the oil temperature in the high-temperature oil pipe has not reached the first preset temperature value, or when the first temperature control signal indicates that the water temperature in the circulating water tank has reached the second preset temperature value, and then self-resets after the second control circuit is disconnected.

[0032] The second contactor coil is used to control the operation of the circulating water pump when the second control circuit is turned on.

[0033] Furthermore, in some embodiments, a hot water circulation solenoid valve is provided inside the hot water circulation pipe, which is used to control the conduction of the hot water circulation pipe loop.

[0034] The third controller is also connected in communication with the hot water circulation solenoid valve. The third controller is also used to control the opening and closing of the hot water circulation solenoid valve so that the water in the hot water circulation pipeline loop is circulated and heated by the circulating water tank when the hot water circulation pipeline loop is open.

[0035] Furthermore, in some embodiments, the third controller includes a third control circuit and a first signal transmission circuit, with the third control circuit and the first signal transmission circuit connected in parallel.

[0036] The third control circuit is used to control the opening and closing of the hot water circulation solenoid valve according to the second water level signal and the fourth temperature control signal. The first signal transmission circuit includes a first signal receiver, which is used to transmit the second water level signal to the second controller.

[0037] The third control circuit includes a third water level switch, a fourth water level switch, a third temperature control switch, and a third contactor coil. The third water level switch, the fourth water level switch, the third temperature control switch, and the third contactor coil are connected in series. The third water level switch is normally open, the fourth water level switch is normally closed, and the third temperature control switch is normally closed.

[0038] The third water level switch is used to automatically close when the second water level signal indicates that the water level in the user's water tank is less than the third preset water level value, so that the third control circuit can be turned on, and to automatically reset after the third control circuit is turned off.

[0039] The fourth water level switch is used to automatically disconnect the third control circuit when the second water level signal indicates that the water level in the user's water tank is greater than the fourth preset water level value, and to automatically reset the third control circuit after the third control circuit is disconnected. The third preset water level value is less than the fourth preset water level value.

[0040] The third temperature control switch is used to automatically disconnect the third control circuit when the fourth temperature control signal indicates that the water temperature of the long-distance hot water supply pipe has reached the third preset temperature value, and to automatically reset the third control circuit after the third control circuit is disconnected.

[0041] The third contactor coil is used to control the opening of the hot water circulation solenoid valve to make the hot circulation pipeline loop open when the third control circuit is turned on.

[0042] Furthermore, in some embodiments, the third controller is also provided with a fourth control circuit, which is used to control the opening and closing of the hot water solenoid valve according to the second water level signal and the fourth temperature control signal.

[0043] The fourth control circuit includes a fifth water level switch, a sixth water level switch, a fourth temperature control switch, and a fourth contactor coil. The fifth water level switch, the sixth water level switch, the fourth temperature control switch, and the fourth contactor coil are connected in series. The fifth water level switch is normally open, the sixth water level switch is normally closed, and the fourth temperature control switch is normally open.

[0044] The fifth water level switch is used to automatically close when the second water level signal indicates that the water level in the user's water tank is lower than the third preset water level value, so that the fourth control circuit can be turned on, and to automatically reset after the fourth control circuit is turned off.

[0045] The sixth water level switch is used to automatically disconnect the fourth control circuit when the second water level signal indicates that the water level in the user's water tank is greater than the fourth preset water level value, and to automatically reset the fourth control circuit after the fourth control circuit is disconnected.

[0046] The fourth temperature control switch is used to automatically close when the fourth temperature control signal indicates that the water temperature of the long-distance hot water supply pipe has reached the third preset temperature value, so as to turn on the fourth control circuit, and to automatically reset after the fourth control circuit is turned off.

[0047] The fourth contactor coil is used to control the opening of the hot water supply solenoid valve when the fourth control circuit is turned on, so that water from the long-distance hot water supply pipe can be transferred to the user's water tank.

[0048] Furthermore, in some embodiments, the second controller includes a fifth control circuit and a second signal transmission circuit, with the fifth control circuit and the second signal transmission circuit connected in parallel.

[0049] The second signal transmission circuit includes a second signal receiver, which is used to receive the second water level signal transmitted by the third controller. The fifth control circuit is used to control the start and stop of the hot water pump according to the second temperature control signal and the second water level signal.

[0050] The fifth control circuit includes a seventh water level switch, an eighth water level switch, a fifth temperature control switch, and a fifth contactor coil. The seventh water level switch, the eighth water level switch, the fifth temperature control switch, and the fifth contactor coil are connected in series. The seventh water level switch is normally open, the eighth water level switch is normally closed, and the fifth temperature control switch is normally open.

[0051] The seventh water level switch is used to automatically close when the second water level signal indicates that the water level in the user's water tank is at the third preset water level value, so that the fifth control circuit can be turned on, and to automatically reset after the fifth control circuit is turned off.

[0052] The eighth water level switch is used to automatically disconnect the fifth control circuit when the second water level signal indicates that the water level in the user's water tank is at the fourth preset water level value, and to automatically reset the fifth control circuit after the fifth control circuit is disconnected.

[0053] The fifth temperature control switch is used to automatically close when the second temperature control signal indicates that the water temperature in the circulating water tank has reached the fourth preset temperature value, so that the fifth control circuit can be turned on, and to automatically reset after the fifth control circuit is turned off.

[0054] The fifth contactor coil is used to control the hot water pump to operate when the fifth control circuit is turned on, so that the water in the circulating water tank can be transferred to the long-distance hot water pipe.

[0055] The embodiments of this utility model have the following beneficial effects: By providing an air compressor, a heat recovery device, a circulating water tank, a circulating water pump, a user water tank, a hot water pump, and a hot water solenoid valve, the heat recovery device is connected to the air compressor pipeline and is used to receive and convert the heat from the air compressor. The circulating water tank is connected to the heat recovery device pipeline. The circulating water pump is located in the pipeline structure between the circulating water tank and the heat recovery device. The user water tank is connected to the circulating water tank pipeline. The pipeline structure between the user water tank and the circulating water tank includes a long-distance hot water supply pipe and a hot water circulating pipe. One end of the long-distance hot water supply pipe is connected to the circulating water tank, and the other end is connected to the user water tank. The system is connected to the tank, with one end of the hot water circulation pipe connected to the circulating water tank and the other end connected to the long-distance hot water pipe. The long-distance hot water pipe, the hot water circulation pipe, and the circulating water tank form a hot water circulation loop. The hot water pump is located inside the long-distance hot water pipe and close to the circulating water tank. The hot water pump is used to transfer water from the circulating water tank to the user's water tank. The hot water solenoid valve is located inside the long-distance hot water pipe and close to the user's water tank. The hot water solenoid valve is used to control the connection between the user's water tank and the circulating water tank, thereby enabling the recovery of waste heat from the air compressor and continuous heating of the user's water supply, improving heat recovery efficiency, and ensuring the supply temperature and heating efficiency of the hot water. Attached Figure Description

[0056] Figure 1 This is an optional overall structural diagram of the air compressor waste heat recovery system provided in this embodiment of the utility model;

[0057] Figure 2 This is an optional circuit diagram of the first controller provided in this embodiment of the present utility model;

[0058] Figure 3This is an optional circuit diagram of the third controller provided in this embodiment of the utility model;

[0059] Figure 4 This is an optional circuit diagram of the second controller provided in this embodiment of the utility model.

[0060] Figure description: Air compressor 100, heat recovery device 101, circulating water tank 102, circulating water pump 103, user water tank 104, hot water pump 105, hot water solenoid valve 106, cold water supply solenoid valve 107, hot water circulation solenoid valve 108, long-distance hot water pipe 109, hot water circulation pipe 110, high-temperature oil pipe 111, first temperature detector 112, second temperature detector 113, third temperature detector 114, fourth temperature detector 115, first water level detector 116, second water level detector 117;

[0061] First controller 200, second controller 201, third controller 202, first control circuit 203, first water level switch 204, second water level switch 205, water replenishment solenoid valve coil 206, second control circuit 207, first temperature control switch 208, second temperature control switch 209, second contactor coil 210, third control circuit 211, third water level switch 212, fourth water level switch 213, third temperature control switch 214, third contactor coil 215, fourth control circuit 216, fifth water level switch 217, sixth water level switch 218, fourth temperature control switch 219, fourth contactor coil 220, first signal transmission circuit 221, first signal receiver 222, second signal transmission circuit 223, second signal receiver 224, fifth control circuit 225, seventh water level switch 226, eighth water level switch 227, fifth temperature control switch 228, fifth contactor coil 229. Detailed Implementation

[0062] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0063] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0064] It should also be noted that in the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first" and "second" are used, they are only for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing embodiments of the invention only and is not intended to limit the invention.

[0066] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0067] Waste heat recovery from air compressors is now widely used, and different systems can be configured based on the air compressor's cooling method, different operating environments, different usage purposes, and control requirements. However, existing technologies have the following drawbacks: most waste heat recovery systems are only suitable for local use, have low heat recovery efficiency, and cannot ensure the supply water temperature and heating efficiency for extended periods; small-scale constant-pressure water supply systems result in long-term high-temperature and high-pressure conditions in the hot water supply pipes, leading to frequent pump start-ups and shutdowns; the initial hot water temperature at the end of the hot water supply pipe is relatively low; and the heating efficiency of cold water replenishment is not high.

[0068] Based on this, the present invention provides an air compressor waste heat recovery system that can automatically recover waste heat from the air compressor and continuously heat the water supplied to users, thereby improving heat recovery efficiency and ensuring the supply temperature and heating efficiency of the hot water.

[0069] This utility model provides an air compressor waste heat recovery system, which is specifically described through the following embodiments.

[0070] Reference Figure 1 As shown, Figure 1This is an optional overall structural diagram of an air compressor waste heat recovery system provided in this embodiment of the utility model. The air compressor waste heat recovery system includes an air compressor 100, a heat recovery device 101, a circulating water tank 102, a circulating water pump 103, a user water tank 104, a hot water pump 105, a hot water solenoid valve 106, a first controller 200, a second controller 201, and a third controller 202. The heat recovery device 101 is connected to the air compressor 100 via a pipeline, the circulating water tank 102 is connected to the heat recovery device 101 via a pipeline, and the circulating water pump 103 is located in the circulating water tank 104. In the pipeline structure between the user water tank 104 and the circulating water tank 102, the user water tank 104 is connected to the circulating water tank 102. The hot water pump 105 is located in the pipeline structure between the user water tank 104 and the circulating water tank 102. The hot water solenoid valve 106 is located in the pipeline structure between the user water tank 104 and the circulating water tank 102. The first controller 200 is connected to the circulating water pump 103, the second controller 201 is connected to the hot water pump 105, and the third controller 202 is connected to the second controller 201 and the hot water solenoid valve 106.

[0071] The heat recovery device 101 is used to receive and convert the heat from the air compressor 100. The circulating water pump 103 is used to transfer the water in the circulating water tank 102 to the heat recovery device 101 for heating. The hot water supply pump 105 is used to transfer the water in the circulating water tank 102 to the user water tank 104. The hot water supply solenoid valve 106 is used to control the connection between the user water tank 104 and the circulating water tank 102. The coordinated operation of the circulating water pump 103 and the hot water supply pump 105 ensures that the waste heat of the air compressor 100 can be efficiently transferred and utilized, avoiding the loss of the heat recovered by the heat recovery device 101. Furthermore, through the coordinated operation of the hot water supply pump 105 and the hot water supply solenoid valve 106, the hot water supply can be quickly adjusted according to the needs of the user water tank 104, ensuring that the user can obtain the hot water they need at any time.

[0072] Furthermore, the piping structure between the user water tank 104 and the circulating water tank 102 includes a long-distance hot water supply pipe 109 and a hot water supply circulating pipe 110. One end of the long-distance hot water supply pipe 109 is connected to the circulating water tank 102, and the other end is connected to the user water tank 104. One end of the hot water supply circulating pipe 110 is connected to the circulating water tank 102, and the other end is connected to the long-distance hot water supply pipe 109. 09. A hot water circulation pipe 110 and a circulating water tank 102 form a hot water circulation loop. Through the hot water circulation loop, the water in the long-distance hot water supply pipe 109 and the hot water circulation pipe 110 can flow through the circulating water tank 102 for constant temperature heating. This ensures that the water temperature in the long-distance hot water supply pipe 109 and the hot water circulation pipe 110 is consistent with the water temperature in the circulating water tank 102, improving the efficiency of hot water supply and preventing the water temperature at the end of the long-distance hot water supply pipe 109 from being too low.

[0073] It should be noted that the hot water supply solenoid valve 106 is located inside the long-distance hot water supply pipe 109 and close to the user's water tank 104, and the hot water supply pump 105 is located inside the long-distance hot water supply pipe 109 and close to the circulating water tank 102.

[0074] Furthermore, the first controller 200 is used to control the opening and closing of the circulating water pump 103 to transfer the water in the circulating water tank 102 to the heat recovery device 101 for heating; the second controller 201 is used to control the opening and closing of the hot water pump 105 to transfer the water in the circulating water tank 102 to the user water tank 104; and the third controller 202 is used to control the opening and closing of the hot water solenoid valve 106. Thus, based on the first controller 200, the second controller 201, and the third controller 202 respectively controlling the opening and closing of the circulating water pump 103, the hot water pump 105, and the hot water solenoid valve 106, the automated operation of the system is ensured, and the error of human operation is reduced through automated control, thereby improving the reliability and stability of the system.

[0075] Furthermore, the air compressor 100 waste heat recovery system is also equipped with a cold water supply solenoid valve 107. One end of the cold water supply solenoid valve 107 is connected to the circulating water pump 103 pipeline, and the other end of the cold water supply solenoid valve 107 is connected to the external water supply pipeline. This design enables the system to replenish the water level in a timely manner due to use or other reasons, ensuring that there is always enough water in the circulating water tank 102 for heat recovery and transfer, and maintaining the normal operation of the system.

[0076] The first controller 200 is also communicatively connected to the cold water supply solenoid valve 107. The first controller 200 controls the opening and closing of the cold water supply solenoid valve 107 to allow cold water from the external water supply pipe to be transferred to the circulating water pump 103, and then, via the opening and closing of the circulating water pump 103, to the circulating water tank 102 or the heat recovery device 101. When the water level in the circulating water tank 102 reaches the high level, the first controller 200 controls the cold water supply solenoid valve 107 to close, stopping water supply and preventing water overflow from the tank. This protects the normal operating environment of the system, avoids water waste, and prevents potential safety hazards.

[0077] In one embodiment, when the water level in the circulating water tank 102 is low, the first controller 200 controls the cold water supply solenoid valve 107 to open, and the cold water supply directly enters the heat recovery device 101 through the circulating water pump 103 for preheating, thereby improving heating efficiency. When the circulating water pump 103 is not started, the cold water supply directly enters the circulating water tank 102 through the circulating water pump 103. When the water level in the circulating water tank 102 reaches a high level, the first controller 200 controls the cold water supply solenoid valve 107 to close, stopping water supply and preventing water from overflowing from the tank. This protects the normal operating environment of the system and avoids water waste and potential safety hazards.

[0078] It should be noted that by working together with the cold water supply solenoid valve 107 and the first controller 200, unnecessary water supply and drainage operations are avoided, reducing energy consumption caused by frequent start-up and shutdown of equipment such as water pumps, and further improving the energy-saving effect of the system.

[0079] Furthermore, a hot water circulation solenoid valve 108 is installed inside the hot water circulation pipe 110. The hot water circulation solenoid valve 108 is used to control the conduction of the hot water circulation pipe loop. The third controller 202 is also connected to the hot water circulation solenoid valve 108. The third controller 202 is also used to control the opening and closing of the hot water circulation solenoid valve 108 so that when the hot water circulation pipe loop is in the conduction state, the water in the hot water circulation pipe loop is circulated and heated by the circulating water tank 102. Thus, the opening and closing of the hot water circulation solenoid valve 108 can be automatically controlled by the third controller 202 to keep the water temperature in the long-distance hot water pipe 109 constant, thereby improving the system's automatic heat preservation capability.

[0080] Furthermore, the circulating water tank 102 includes a first temperature detector 112, a second temperature detector 113, and a first water level detector 116. The first temperature detector 112 and the first water level detector 116 are respectively connected to the first controller 200, and the second temperature detector 113 is connected to the second controller 201. The first temperature detector 112 is used to send a first temperature control signal of the circulating water tank 102 to the first controller 200, the second temperature detector 113 is used to send a second temperature control signal of the circulating water tank 102 to the second controller 201, and the first water level detector 116 is used to send a first water level signal of the circulating water tank 102 to the first controller 200.

[0081] Meanwhile, the user water tank 104 includes a second water level detector, which is communicatively connected to the third controller 202. The second water level detector is used to send the second water level signal of the user water tank 104 to the third controller 202.

[0082] Furthermore, the pipeline structure between the heat recovery device 101 and the air compressor 100 includes a high-temperature oil pipe 111. The high-temperature oil pipe 111 is equipped with a third temperature detector 114. The third temperature detector 114 is communicatively connected to the first controller 200. The third temperature detector 114 is used to send a third temperature control signal of the high-temperature oil pipe 111 to the first controller 200.

[0083] It should also be noted that the long-distance hot water supply pipe 109 is also equipped with a fourth temperature detector 115, which is connected to the third controller 202. The fourth temperature detector 115 is used to send the fourth temperature control signal of the long-distance hot water supply pipe 109 to the third controller 202.

[0084] Furthermore, refer to Figure 2 As shown, Figure 2 This is an optional circuit diagram of the first controller provided in this utility model embodiment. The first controller 200 is provided with a first control circuit 203, which is used to control the opening and closing of the cold water supply solenoid valve 107 according to the first water level signal.

[0085] The first control circuit 203 includes a first water level switch 204, a second water level switch 205, and a water replenishment solenoid valve coil 206. The first water level switch 204, the second water level switch 205, and the water replenishment solenoid valve coil are connected in series. The first water level switch 204 is normally open, and the second water level switch 205 is normally closed.

[0086] The first water level switch 204 is used to automatically close when the first water level signal indicates that the water level in the circulating water tank 102 is less than the first preset water level value, so that the first control circuit 203 is turned on, and to automatically reset after the first control circuit 203 is turned off; the second water level switch 205 is used to automatically open when the first water level signal indicates that the water level in the circulating water tank 102 is greater than the second preset water level value, so that the first control circuit 203 is turned off, and to automatically reset after the first control circuit 203 is turned off; the water replenishment solenoid valve coil 206 is used to control the cold water replenishment solenoid valve 107 to open when the first control circuit 203 is turned on, so that cold water from the external water replenishment pipe is transferred to the circulating water pump 103.

[0087] The first preset water level value is less than the second preset water level value.

[0088] In one embodiment, when the water level in the circulating water tank 102 is lower than the first preset water level value (5L), the first water level switch 204 automatically closes, causing the first control circuit 203 to conduct. This, in turn, causes the water replenishment solenoid valve coil 206 to control the cold water replenishment solenoid valve 107 to change from closed to open, allowing cold water from the external water replenishment pipe to be transferred to the circulating water pump 103. In another embodiment, when the water level in the circulating water tank 102 is higher than the second preset water level value (15L), the second water level switch 205 automatically opens, causing the first control circuit 203 to disconnect. Then, the first water level switch 204 and the second water level switch 205 begin to self-reset, simultaneously causing the cold water replenishment solenoid valve 107 to change from open to closed, thereby interrupting the cold water transfer from the external water replenishment pipe.

[0089] Furthermore, the first controller 200 is also provided with a second control circuit 207, which is connected in parallel with the first control circuit 203. The second control circuit 207 is used to control the start and stop of the circulating water pump 103 according to the first temperature control signal and the third temperature control signal.

[0090] The second control circuit 207 includes a first temperature control switch 208, a second temperature control switch 209, and a second contactor coil 210. The first temperature control switch 208, the second temperature control switch 209, and the second contactor coil 210 are connected in series. The first temperature control switch 208 is normally open, and the second temperature control switch 209 is normally closed.

[0091] The first temperature control switch 208 is used to automatically close when the third temperature control signal indicates that the oil temperature of the high-temperature oil pipe 111 has reached the first preset temperature value, and the first temperature control signal indicates that the water temperature of the circulating water tank 102 has not reached the second preset temperature value, so as to turn on the second control circuit 207, and to automatically reset after the second control circuit 207 is turned off; the second temperature control switch 209 is used to automatically disconnect when the third temperature control signal indicates that the oil temperature of the high-temperature oil pipe 111 has not reached the first preset temperature value, or the first temperature control signal indicates that the water temperature of the circulating water tank 102 has reached the second preset temperature value, so as to turn off the second control circuit 207, and to automatically reset after the second control circuit 207 is turned off.

[0092] The second contactor coil 210 is used to control the operation of the circulating water pump 103 when the second control circuit 207 is turned on.

[0093] In one embodiment, when the oil temperature in the high-temperature oil pipe 111 reaches the first preset temperature value (50°C) and the water temperature in the circulating water tank 102 does not reach the second preset temperature value (70°C), the first temperature control switch 208 closes automatically, causing the second control circuit 207 to conduct, thereby causing the second contactor coil 210 to control the circulating water pump 103 to work, so that the water in the circulating water tank 102 is transferred to the heat recovery device 101 for heating. In another embodiment, when the oil temperature in the high-temperature oil pipe 111 does not reach the first preset temperature value (50°C), or when the first temperature control signal indicates that the water temperature in the circulating water tank 102 has reached the second preset temperature value (70°C), the second temperature control switch 209 opens automatically, causing the second control circuit 207 to disconnect. Then, the first temperature control switch 208 and the second temperature control switch 209 begin to self-reset, and at the same time control the circulating water pump 103 to stop working, thereby interrupting the water transfer in the circulating water tank 102.

[0094] Furthermore, refer to Figure 3 As shown, Figure 3 This is an optional circuit diagram of the third controller provided in this embodiment of the utility model. The third controller 202 includes a third control circuit 211 and a first signal transmission circuit 221, which are connected in parallel.

[0095] The third control circuit 211 is used to control the opening and closing of the hot water circulation solenoid valve 108 according to the second water level signal and the fourth temperature control signal. The first signal transmission circuit 221 includes a first signal receiver 222, which is used to transmit the second water level signal to the second controller 201.

[0096] The third control circuit 211 includes a third water level switch 212, a fourth water level switch 213, a third temperature control switch 214, and a third contactor coil 215. The third water level switch 212, the fourth water level switch 213, the third temperature control switch 214, and the third contactor coil 215 are connected in series. The third water level switch 212 is normally open, the fourth water level switch 213 is normally closed, and the third temperature control switch 214 is normally closed.

[0097] The third water level switch 212 is used to automatically close when the second water level signal indicates that the water level in the user water tank 104 is less than the third preset water level value, so that the third control circuit 211 is turned on, and to automatically reset after the third control circuit 211 is turned off; the fourth water level switch 213 is used to automatically open when the second water level signal indicates that the water level in the user water tank 104 is greater than the fourth preset water level value, so that the third control circuit 211 is turned off, and to automatically reset after the third control circuit 211 is turned off; the third temperature control switch 214 is used to automatically open when the fourth temperature control signal indicates that the water temperature in the long-distance hot water supply pipe 109 reaches the third preset temperature value, so that the third control circuit 211 is turned off, and to automatically reset after the third control circuit 211 is turned off.

[0098] The third preset water level value is less than the fourth preset water level value.

[0099] The third contactor coil 215 is used to control the hot water circulation solenoid valve 108 to open so that the hot circulation pipeline loop is open when the third control circuit 211 is turned on.

[0100] In one embodiment, when the water level in the user's water tank 104 is less than the third preset water level value (10L), and the water temperature in the long-distance hot water supply pipe 109 has not reached the third preset temperature value (50℃), the third water level switch 212 closes automatically, causing the third control circuit 211 to conduct, which in turn causes the third contactor coil 215 to control the hot water circulation solenoid valve 108 to change from closed to open, thus making the hot water circulation pipe loop open, and allowing the hot water at the end of the long-distance hot water supply pipe 109 to return to the circulating water tank 102 for heating.

[0101] In one embodiment, when the water level in the user's water tank 104 is greater than the fourth preset water level value (20L), the fourth water level switch 213 automatically disconnects, causing the third control circuit 211 to disconnect. Then, the third water level switch 212, the fourth water level switch 213, and the third temperature control switch 214 begin to self-reset, causing the hot water circulation solenoid valve 108 to switch from open to closed, thereby interrupting the hot circulation pipeline loop.

[0102] In one embodiment, when the water temperature of the long-distance hot water supply pipe 109 reaches the third preset temperature value (50°C), the third temperature control switch 214 automatically disconnects, causing the third control circuit 211 to disconnect. Then, the third water level switch 212, the fourth water level switch 213, and the third temperature control switch 214 begin to self-reset, causing the hot water circulation solenoid valve 108 to switch from open to closed, thereby interrupting the hot circulation pipeline loop and preventing the constant pressure hot water supply from causing the long-distance hot water supply pipe 109 to be in a high temperature and high pressure state for a long time. This keeps the water temperature of the long-distance hot water supply pipe 109 constantly below the third preset temperature value, improving the durability of the system.

[0103] Furthermore, the third controller 202 is also provided with a fourth control circuit 216, which is connected in parallel with the third control circuit 211. The fourth control circuit 216 is used to control the opening and closing of the hot water supply solenoid valve 106 according to the second water level signal and the fourth temperature control signal.

[0104] The fourth control circuit 216 includes a fifth water level switch 217, a sixth water level switch 218, a fourth temperature control switch 219, and a fourth contactor coil 220. The fifth water level switch 217, the sixth water level switch 218, the fourth temperature control switch 219, and the fourth contactor coil 220 are connected in series. The fifth water level switch 217 is normally open, the sixth water level switch 218 is normally closed, and the fourth temperature control switch 219 is normally open.

[0105] The fifth water level switch 217 is used to automatically close when the second water level signal indicates that the water level in the user water tank 104 is less than the third preset water level value, so as to turn on the fourth control circuit 216, and to automatically reset after the fourth control circuit 216 is turned off; the sixth water level switch 218 is used to automatically open when the second water level signal indicates that the water level in the user water tank 104 is greater than the fourth preset water level value, so as to turn off the fourth control circuit 216, and to automatically reset after the fourth control circuit 216 is turned off; the fourth temperature control switch 219 is used to automatically close when the fourth temperature control signal indicates that the water temperature in the long-distance hot water supply pipe 109 reaches the third preset temperature value, so as to turn on the fourth control circuit 216, and to automatically reset after the fourth control circuit 216 is turned off.

[0106] The fourth contactor coil 220 is used to control the hot water supply solenoid valve 106 to open when the fourth control circuit 216 is turned on, so that water from the long-distance hot water supply pipe 109 can be transferred to the user's water tank 104.

[0107] In one embodiment, when the water level in the user's water tank 104 is less than the third preset water level value (10L), the fifth water level switch 217 automatically closes. At the same time, when the water temperature in the long-distance hot water supply pipe 109 reaches the third preset temperature value (50℃), the fourth temperature control switch 219 automatically closes. At this time, the fourth control circuit 216 is turned on, which causes the fourth contactor coil 220 to control the hot water supply solenoid valve 106 to change from closed to open, so that the hot water from the long-distance hot water supply pipe 109 can be transmitted to the user's water tank 104, thereby ensuring that the hot water transmitted to the user's water tank 104 is always above the third preset temperature value.

[0108] In one embodiment, when the water level in the user's water tank 104 is greater than the fourth preset water level value (20L), the sixth water level switch 218 automatically disconnects, causing the fourth control circuit 216 to disconnect. Then, the fifth water level switch 217, the sixth water level switch 218, and the fourth temperature control switch 219 begin to self-reset, causing the hot water supply solenoid valve 106 to switch from open to closed, thereby interrupting the hot water transmission of the long-distance hot water supply pipe 109 and ensuring that the water in the user's water tank 104 will not overflow due to excessive water supply.

[0109] Furthermore, refer to Figure 4 As shown, Figure 4 This is an optional circuit diagram of the second controller provided in this embodiment of the present utility model. The second controller 201 is provided with a fifth control circuit 225 and a second signal transmission circuit 223. The fifth control circuit 225 and the second signal transmission circuit 223 are connected in parallel.

[0110] The second signal transmission circuit 223 includes a second signal receiver 224, which is used to receive the second water level signal transmitted by the third controller 202. The fifth control circuit 225 is used to control the start and stop of the hot water pump 105 according to the second temperature control signal and the second water level signal.

[0111] In one embodiment, the communication method between the second signal receiver 224 and the first signal receiver 222 is LORA wireless communication.

[0112] The fifth control circuit 225 includes a seventh water level switch 226, an eighth water level switch 227, a fifth temperature control switch 228, and a fifth contactor coil 229. The seventh water level switch 226, the eighth water level switch 227, the fifth temperature control switch 228, and the fifth contactor coil 229 are connected in series. The seventh water level switch 226 is normally open, the eighth water level switch 227 is normally closed, and the fifth temperature control switch 228 is normally open.

[0113] The seventh water level switch 226 is used to automatically close when the second water level signal indicates that the water level of the user water tank 104 is at the third preset water level value, so as to turn on the fifth control circuit 225, and to automatically reset after the fifth control circuit 225 is turned off; the eighth water level switch 227 is used to automatically open when the second water level signal indicates that the water level of the user water tank 104 is at the fourth preset water level value, so as to turn off the fifth control circuit 225, and to automatically reset after the fifth control circuit 225 is turned off; the fifth temperature control switch 228 is used to automatically close when the second temperature control signal indicates that the water temperature of the circulating water tank 102 reaches the fourth preset temperature value, so as to turn on the fifth control circuit 225, and to automatically reset after the fifth control circuit 225 is turned off.

[0114] The fifth contactor coil 229 is used to control the hot water pump 105 to operate when the fifth control circuit 225 is turned on, so that the water in the circulating water tank 102 is transferred to the long-distance hot water pipe 109.

[0115] In one embodiment, when the water level in the user's water tank 104 is less than the third preset water level value (10L), the seventh water level switch 226 automatically closes. At the same time, when the water temperature in the circulating water tank 102 reaches the fourth preset temperature value (60℃), the fifth temperature control switch 228 automatically closes. At this time, the fifth control circuit 225 is turned on, which in turn causes the fifth contactor coil 229 to control the hot water pump 105 to work, so that the hot water in the circulating water tank 102 can be transferred to the end of the long-distance hot water pipe 109.

[0116] In one embodiment, when the water level in the user's water tank 104 is greater than the fourth preset water level value (20L), the eighth water level switch 227 automatically disconnects, causing the fifth control circuit 225 to disconnect. Then, the seventh water level switch 226, the eighth water level switch 227, and the fifth temperature control switch 228 begin to self-reset, causing the hot water pump 105 to stop working, thereby interrupting the hot water transmission of the circulating water tank 102 and ensuring that the water in the user's water tank 104 will not overflow due to excessive water supply.

[0117] The embodiments described in this utility model are for the purpose of more clearly illustrating the technical solutions of this utility model, and do not constitute a limitation on the technical solutions provided by this utility model. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by this utility model are also applicable to similar technical problems.

[0118] The terms "first," "second," "third," "fourth," etc. (if present) in the specification and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that includes a series of steps or apparatuses is not necessarily limited to those explicitly listed, but may include other steps or apparatuses not explicitly listed or inherent to such processes, methods, products, or apparatuses.

[0119] It should be understood that in this utility model, "at least one (item)" refers to one or more, and "more than one" refers to two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0120] In the several embodiments provided by this utility model, it should be understood that the disclosed system can be implemented in other ways. For example, the system embodiments described above are merely illustrative. For instance, the division of the above-described devices is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple devices or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or equipment, and may be electrical, mechanical, or other forms.

[0121] The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but this does not limit the scope of the present invention. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and spirit of the present invention should be within the scope of the present invention.

Claims

1. An air compressor waste heat recovery system, characterized by, include: Air compressor; A heat recovery device is connected to the air compressor pipeline and is used to receive and convert the heat from the air compressor. A circulating water tank, which is connected to the heat recovery device via a pipeline; A circulating water pump is installed in the pipeline structure between the circulating water tank and the heat recovery device. The user water tank is connected to the circulating water tank via a pipeline. The pipeline structure between the user water tank and the circulating water tank includes a long-distance hot water supply pipe and a hot water supply circulating pipe. One end of the long-distance hot water supply pipe is connected to the circulating water tank, and the other end of the long-distance hot water supply pipe is connected to the user water tank. One end of the hot water supply circulating pipe is connected to the circulating water tank, and the other end of the hot water supply circulating pipe is connected to the long-distance hot water supply pipe. The long-distance hot water supply pipe, the hot water supply circulating pipe, and the circulating water tank form a hot water circulation pipeline loop. A hot water pump is installed inside the long-distance hot water pipe and close to the circulating water tank. The hot water pump is used to transfer water from the circulating water tank to the user's water tank. A hot water supply solenoid valve is installed inside the long-distance hot water supply pipe and close to the user water tank. A hot water supply pump is installed inside the long-distance hot water supply pipe and close to the circulating water tank. The hot water supply solenoid valve is used to control the connection between the user water tank and the circulating water tank.

2. The air compressor waste heat recovery system of claim 1, wherein, The system also includes: A first controller is communicatively connected to the circulating water pump. The first controller is used to control the opening and closing of the circulating water pump to transfer the water in the circulating water tank to the heat recovery device for heating. The second controller is communicatively connected to the hot water pump and is used to control the start and stop of the hot water pump to transfer water from the circulating water tank to the user water tank. The third controller is communicatively connected to the second controller and the hot water solenoid valve, and is used to control the opening and closing of the hot water solenoid valve.

3. The air compressor waste heat recovery system according to claim 2, characterized in that, The circulating water tank includes a first temperature detector, a second temperature detector, and a first water level detector. The first temperature detector and the first water level detector are respectively communicatively connected to the first controller. The second temperature detector is communicatively connected to the second controller. The first temperature detector is used to send a first temperature control signal of the circulating water tank to the first controller. The second temperature detector is used to send a second temperature control signal of the circulating water tank to the second controller. The first water level detector is used to send a first water level signal of the circulating water tank to the first controller. The user water tank includes a second water level detector, which is communicatively connected to the third controller. The second water level detector is used to send a second water level signal of the user water tank to the third controller, and the third controller is also used to transmit the second water level signal to the second controller. The piping structure between the heat recovery device and the air compressor includes a high-temperature oil pipe. The high-temperature oil pipe is equipped with a third temperature detector. The third temperature detector is communicatively connected to the first controller. The third temperature detector is used to send a third temperature control signal of the high-temperature oil pipe to the first controller. The long-distance hot water supply pipe is also equipped with a fourth temperature detector, which is communicatively connected to the third controller. The fourth temperature detector is used to send a fourth temperature control signal of the long-distance hot water supply pipe to the third controller.

4. The air compressor waste heat recovery system according to claim 3, characterized in that, The system also includes a cold water supply solenoid valve, one end of which is connected to the circulating water pump pipeline, and the other end of which is connected to an external water supply pipeline. The first controller is also communicatively connected to the cold water supply solenoid valve. The first controller is also used to control the opening and closing of the cold water supply solenoid valve so that the cold water from the external water supply pipe is transmitted to the circulating water pump and then transmitted to the circulating water tank or the heat recovery device via the opening and closing of the circulating water pump.

5. The air compressor waste heat recovery system according to claim 4, characterized in that, The first controller is provided with a first control circuit, which is used to control the opening and closing of the cold water supply solenoid valve according to the first water level signal. The first control circuit includes a first water level switch, a second water level switch, and a water replenishment solenoid valve coil. The first water level switch, the second water level switch, and the water replenishment solenoid valve coil are connected in series. The first water level switch is normally open, and the second water level switch is normally closed. The first water level switch is used to automatically close when the first water level signal indicates that the water level of the circulating water tank is less than the first preset water level value, so that the first control circuit is turned on, and to automatically reset after the first control circuit is turned off. The second water level switch is used to automatically disconnect when the first water level signal indicates that the water level in the circulating water tank is greater than the second preset water level value, thereby disconnecting the first control circuit, and to automatically reset after the first control circuit is disconnected; wherein, the first preset water level value is less than the second preset water level value. The water replenishment solenoid valve coil is used to control the cold water replenishment solenoid valve to open when the first control circuit is turned on, so that the cold water from the external water replenishment pipe is transmitted to the circulating water pump.

6. The air compressor waste heat recovery system according to claim 3, characterized in that, The first controller is further provided with a second control circuit, which is used to control the start and stop of the circulating water pump according to the first temperature control signal and the third temperature control signal; The second control circuit includes a first temperature control switch, a second temperature control switch, and a second contactor coil. The first temperature control switch, the second temperature control switch, and the second contactor coil are connected in series. The first temperature control switch is in a normally open state, and the second temperature control switch is in a normally closed state. The first temperature control switch is used to automatically close when the third temperature control signal indicates that the oil temperature of the high-temperature oil pipe has reached a first preset temperature value and the first temperature control signal indicates that the water temperature of the circulating water tank has not reached a second preset temperature value, so that the second control circuit is turned on, and to automatically reset after the second control circuit is turned off. The second temperature control switch is used to automatically disconnect the second control circuit when the third temperature control signal indicates that the oil temperature of the high-temperature oil pipe has not reached the first preset temperature value, or when the first temperature control signal indicates that the water temperature of the circulating water tank has reached the second preset temperature value, and to automatically reset the second control circuit after the second control circuit is disconnected. The second contactor coil is used to control the operation of the circulating water pump when the second control circuit is turned on.

7. The air compressor waste heat recovery system according to claim 3, characterized in that, The hot water circulation pipe is equipped with a hot water circulation solenoid valve, which is used to control the conduction of the hot water circulation pipe loop. The third controller is also communicatively connected to the hot water circulation solenoid valve, and the third controller is also used to control the opening and closing of the hot water circulation solenoid valve so that when the hot circulation pipeline loop is open, the water in the hot circulation pipeline loop is circulated and heated by the circulating water tank.

8. The air compressor waste heat recovery system according to claim 7, characterized in that, The third controller is provided with a third control circuit and a first signal transmission circuit, and the third control circuit and the first signal transmission circuit are connected in parallel. The third control circuit is used to control the opening and closing of the hot water circulation solenoid valve according to the second water level signal and the fourth temperature control signal. The first signal transmission circuit includes a first signal receiver, which is used to transmit the second water level signal to the second controller. The third control circuit includes a third water level switch, a fourth water level switch, a third temperature control switch, and a third contactor coil. The third water level switch, the fourth water level switch, the third temperature control switch, and the third contactor coil are connected in series. The third water level switch is normally open, the fourth water level switch is normally closed, and the third temperature control switch is normally closed. The third water level switch is used to automatically close when the second water level signal indicates that the water level in the user's water tank is less than the third preset water level value, so that the third control circuit is turned on, and to automatically reset after the third control circuit is turned off. The fourth water level switch is used to automatically disconnect the third control circuit when the second water level signal indicates that the water level in the user's water tank is greater than the fourth preset water level value, and to automatically reset the third control circuit after the third control circuit is disconnected, wherein the third preset water level value is less than the fourth preset water level value. The third temperature control switch is used to automatically disconnect the third control circuit when the fourth temperature control signal indicates that the water temperature of the long-distance hot water supply pipe has reached the third preset temperature value, and to automatically reset the third control circuit after the third control circuit is disconnected. The third contactor coil is used to control the hot water circulation solenoid valve to open so that the hot circulation pipeline loop is opened when the third control circuit is turned on.

9. The air compressor waste heat recovery system according to claim 8, characterized in that, The third controller is further provided with a fourth control circuit, which is used to control the opening and closing of the hot water solenoid valve according to the second water level signal and the fourth temperature control signal. The fourth control circuit includes a fifth water level switch, a sixth water level switch, a fourth temperature control switch, and a fourth contactor coil. The fifth water level switch, the sixth water level switch, the fourth temperature control switch, and the fourth contactor coil are connected in series. The fifth water level switch is normally open, the sixth water level switch is normally closed, and the fourth temperature control switch is normally open. The fifth water level switch is used to automatically close when the second water level signal indicates that the water level in the user's water tank is less than the third preset water level value, so that the fourth control circuit is turned on, and to automatically reset after the fourth control circuit is turned off. The sixth water level switch is used to automatically disconnect the fourth control circuit when the second water level signal indicates that the water level in the user's water tank is greater than the fourth preset water level value, and to automatically reset the fourth control circuit after the fourth control circuit is disconnected. The fourth temperature control switch is used to automatically close when the fourth temperature control signal indicates that the water temperature of the long-distance hot water supply pipe has reached the third preset temperature value, so as to turn on the fourth control circuit, and to automatically reset after the fourth control circuit is turned off. The fourth contactor coil is used to control the hot water supply solenoid valve to open when the fourth control circuit is turned on, so that the water from the long-distance hot water supply pipe can be transmitted to the user's water tank.

10. The air compressor waste heat recovery system according to claim 8, characterized in that, The second controller includes a fifth control circuit and a second signal transmission circuit, wherein the fifth control circuit and the second signal transmission circuit are connected in parallel. The second signal transmission circuit includes a second signal receiver, which is used to receive the second water level signal transmitted by the third controller. The fifth control circuit is used to control the start and stop of the hot water pump according to the second temperature control signal and the second water level signal. The fifth control circuit includes a seventh water level switch, an eighth water level switch, a fifth temperature control switch, and a fifth contactor coil. The seventh water level switch, the eighth water level switch, the fifth temperature control switch, and the fifth contactor coil are connected in series. The seventh water level switch is normally open, the eighth water level switch is normally closed, and the fifth temperature control switch is normally open. The seventh water level switch is used to automatically close when the second water level signal indicates that the water level of the user's water tank is at the third preset water level value, so that the fifth control circuit is turned on, and to automatically reset after the fifth control circuit is turned off; The eighth water level switch is used to automatically disconnect the fifth control circuit when the second water level signal indicates that the water level of the user's water tank is at the fourth preset water level value, and to automatically reset the fifth control circuit after the fifth control circuit is disconnected. The fifth temperature control switch is used to automatically close when the second temperature control signal indicates that the water temperature of the circulating water tank has reached the fourth preset temperature value, so as to turn on the fifth control circuit, and to automatically reset after the fifth control circuit is turned off. The fifth contactor coil is used to control the hot water pump to operate when the fifth control circuit is turned on, so that the water in the circulating water tank is transferred to the long-distance hot water pipe.

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