Heat exchange device of air compressor

Abstract

The utility model relates to an air compressor heat exchange device which comprises a heat exchange box, a heat exchanger is transversely arranged in the heat exchange box, the heat exchanger comprises a cylindrical shell, baffle plates are vertically arranged in the cylindrical shell at intervals, the two end faces of the cylindrical shell are connected with pipe plates in a sealed mode, the two ends of the cylindrical shell are further connected with end covers respectively, and containing cavities are formed between the end covers and the pipe plates. A tube bundle is fixedly connected between the two tube plates, the end of the tube bundle penetrates through the tube plates on the two sides and is communicated with the containing cavity, the interior of the containing cavity on one side is divided into a liquid inlet cavity and a liquid outlet cavity through a partition plate, a water inlet pipe communicated with the liquid inlet cavity and a water return pipe communicated with the liquid outlet cavity are connected to the end cover, and a circulating water tank is connected between the water inlet pipe and the water return pipe. An oil return opening is formed in the side wall of the end, close to the water inlet pipe, of the cylindrical shell and connected with an oil return pipe, and an oil inlet is formed in the side wall of the other end of the cylindrical shell and connected with an oil inlet pipe. According to the utility model, waste heat utilization of hot oil of the air compressor can be realized, and hot water for production and living can be produced.

Description

Technical Field

[0001] This utility model relates to the technical field of waste heat recovery devices, specifically to a heat exchange device for an air compressor. Background Technology

[0002] Air compressors are widely used in my country, with many in the electronics and light industries employing either air-cooled or water-cooled structures for heat dissipation. Air-cooling involves using fans to expel the heat generated by the compressor into the atmosphere, essentially releasing the heat into the atmosphere unnecessarily. Meanwhile, heat-requiring systems in workshops, such as those for welding wire processing (e.g., pure water heating, domestic hot water, process hot water, and air conditioning unit heating), consume significant amounts of primary energy, resulting in high energy costs. Therefore, from an energy-saving and environmental perspective, it is crucial to fully utilize the heat generated by air compressors, converting it into energy that can be reused in businesses and daily life.

[0003] On the other hand, the compressor in an air compressor generates a lot of waste heat during operation. If the cooling system itself is not efficient enough, it will often cause a temperature rise, affecting the normal operation of the air compressor. For example, when an air-cooled air compressor is running in summer, the ambient temperature is very high, the air compressor's cooling efficiency decreases, and the temperature rise directly affects the normal operation of the air compressor.

[0004] Currently, waste heat recovery technologies for air compressors, such as a fully automatic hot water unit for waste heat from an air compressor (ZL200820005190.6), a heat recovery system for air-cooled air compressors (ZL200820154398.4), and a high-efficiency heat recovery system for air compressors (ZL200820154399.9), mainly focus on structural modifications to the air compressor equipment. These modifications are costly and can easily damage the air compressor structure, affecting after-sales warranty. Utility Model Content

[0005] In view of the shortcomings of the existing technology, this utility model provides an air compressor heat exchange device that can use the heat of the hot oil in the air compressor to exchange heat with pure water to produce hot water that can be used for production and daily life. This not only reduces the load on the air compressor, but also realizes the recycling of heat, reduces energy consumption, and is environmentally friendly and pollution-free.

[0006] This utility model is achieved through the following technical solution:

[0007] A heat exchange device for an air compressor is provided, including a heat exchange box installed between the oil inlet pipe and the oil return pipe of the air compressor. A heat exchanger is horizontally arranged inside the heat exchange box. The heat exchanger includes a cylindrical shell. Vertically spaced baffles are arranged at intervals along the axial direction on the inner wall of the cylindrical shell. Tube sheets are respectively sealed to both ends of the cylindrical shell, and end caps sealing the tube sheets are also connected to both ends of the cylindrical shell. A cavity is formed between the end caps and the corresponding tube sheets. A tube bundle penetrating each baffle is fixedly connected between two tube sheets. The end portion of the tube bundle... The tube sheet runs through both sides and connects to the accommodating cavities on both sides. The accommodating cavity on one side is divided into an upper outlet cavity and a lower inlet cavity by a partition. The end cap is connected to an inlet pipe that connects to the inlet cavity and a return pipe that connects to the outlet cavity. A circulating water tank is connected between the inlet pipe and the return pipe. A circulating water pump is installed on the inlet pipe. An exhaust port is opened on the top of the circulating water tank and an exhaust valve is installed. An oil return port is opened on the side wall of the cylindrical shell near the inlet pipe and connected to the oil return pipe. An oil inlet is opened on the side wall of the cylindrical shell away from the inlet pipe and connected to the oil inlet pipe.

[0008] Furthermore, a solenoid valve I is installed between the inlet pipe and the circulating water tank and the circulating water pump. A branch pipe with a solenoid valve II is connected between the inlet pipe and the circulating water pump. A solenoid valve III is installed on the return pipe. A branch pipe with a solenoid valve IV is also connected between the return pipe and the heat exchange box. A buffer tank is connected through the return branch pipe. The outlet of the buffer tank is connected to the circulating water tank through a water supply pipe. A water supply pump is installed on the water supply pipe. A thermometer and a liquid level sensor are installed inside the circulating water tank. A drain pipe with a drain valve is connected to the bottom of the circulating water tank. A drain pump is installed on the drain pipe.

[0009] After the water in the circulating water tank is heated to the set temperature, the circulating water tank is closed and isolated by solenoid valves I and III. The hot water in the circulating water tank is discharged into the drain pipe by the drain pump for production and domestic water use. At the same time, the branch heat exchange between the buffer water tank and the heat exchange box is opened by solenoid valves II and IV to ensure that the oil pipe of the air compressor is continuously heated in the heat exchange box, reducing heat loss. After the hot water in the circulating water tank is drained, the circulating water tank can be replenished by the water pump and the buffer water tank so that the circulating water pump can continuously perform heat exchange.

[0010] Furthermore, observation windows for checking the liquid level are provided on the sides of the circulating water tank.

[0011] By installing an observation window on the side of the circulating water tank, the temperature and liquid level inside the tank can be observed in real time, making it convenient to understand the temperature and liquid level inside the tank.

[0012] Preferably, the space between the inner wall of the heat exchange box and the heat exchanger is filled with insulation material, and the outside of the circulating water tank is covered with insulation material.

[0013] By filling the space between the inner wall of the heat exchange box and the heat exchanger with insulation material, and covering the outside of the circulating water tank with insulation material, the insulation material can be used for insulation, reducing heat loss and heat energy loss.

[0014] The beneficial effects of this utility model are:

[0015] In use, this invention utilizes a heat exchanger to force heat exchange between the hot oil in the air compressor and the pure water in the circulating water tank. This lowers the oil temperature while raising the pure water temperature. Circulation pumping continuously raises the temperature of the pure water in the circulating water tank to reach the temperature required for domestic and industrial use. The high-temperature water after heat exchange is then discharged from the circulating water tank via a drain pipe using a drain pump. Simultaneously with emptying the circulating water pump, a buffer tank and inlet branch pipe work together to continuously exchange heat with the hot oil in the air compressor within the heat exchanger, ensuring continuous heat exchange and thus continuously reducing the operating load of the air compressor and improving its operating efficiency.

[0016] By adjusting the opening and closing of solenoid valves I, II, and III, and in conjunction with the water replenishment pump, the buffer water tank can be used to replenish the circulating water tank, ensuring that water can be refilled into the emptied circulating water tank. This achieves continuous heat exchange with the air compressor, realizes the recycling of heat, reduces energy consumption, and is environmentally friendly and pollution-free. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the heat exchanger in this utility model.

[0019] As shown in the figure:

[0020] 1. Oil return pipe, 2. Oil inlet pipe, 3. Heat exchanger box, 4. Heat exchanger, 5. Water inlet pipe, 6. Water return pipe, 7. Circulating water pump, 8. Circulating water tank, 9. Solenoid valve I, 10. Solenoid valve II, 11. Water inlet branch pipe, 12. Water return branch pipe, 13. Solenoid valve III, 14. Exhaust port, 15. Buffer water tank, 16. Water supply pipe, 17. Water supply pump, 18. Drain pipe, 19. Drain pump, 20. Drain valve, 21. Observation window, 22. Solenoid valve IV, 23. Cylindrical shell, 24. Tube sheet, 25. End cap, 26. Reception cavity, 27. Liquid outlet cavity, 28. Liquid inlet cavity, 29. Baffle, 30. Tube bundle, 31. Baffle plate. Detailed Implementation

[0021] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0022] like Figure 1 and Figure 2As shown, a heat exchange device for an air compressor includes a heat exchange box 3 installed between the oil inlet pipe 2 and the oil return pipe 1 of the air compressor. A heat exchanger 4 is horizontally arranged inside the heat exchange box 3. Insulation material is filled between the inner wall of the heat exchange box 3 and the heat exchanger 4. The heat exchanger 4 includes a cylindrical shell 23. Vertically spaced baffles 31 are arranged along the axial direction on the inner wall of the cylindrical shell 23. Tube sheets 24 are respectively sealed to both ends of the cylindrical shell 23. End caps 25, which are sealed to the outside of the tube sheets, are also connected to both ends of the cylindrical shell 23. A receiving cavity 26 is formed between the tube sheets 24. A tube bundle 30 is fixedly connected between the two tube sheets 24, passing through each baffle 31. The ends of the tube bundle 30 pass through the tube sheets 24 on both sides and communicate with the receiving cavities 26 on both sides. The receiving cavity 26 on one side is divided into an upper liquid outlet cavity 27 and a lower liquid inlet cavity 28 by a partition 29. An inlet pipe 5 communicating with the liquid inlet cavity 28 and a return pipe 6 communicating with the liquid outlet cavity 27 are connected to the end cap 25. A circulating water tank 8 is connected between the inlet pipe 5 and the return pipe 6. The outside of the circulating water tank 8 is covered with heat insulation material.

[0023] A circulating water pump 7 is installed on the water inlet pipe 5. An exhaust port 14 is opened on the top of the circulating water tank 8 and an exhaust valve is installed. An oil return port is opened on the side wall of the cylindrical shell 23 near the water inlet pipe 5 and connected to the oil return pipe 1. An oil inlet is opened on the side wall of the other end of the cylindrical shell 23 away from the water inlet pipe 5 and connected to the oil inlet pipe 2.

[0024] A solenoid valve I9 ​​is ​​installed between the inlet pipe 5 and the circulating water tank 8 and the circulating water pump 7. A branch pipe 11 with a solenoid valve II10 is connected between the inlet pipe 5 and the solenoid valve I9 ​​and the circulating water pump 7. A solenoid valve III13 is installed on the return pipe 6. A branch pipe 12 with a solenoid valve IV22 is also connected between the return pipe 6 and the heat exchange box 3. A buffer tank 15 is connected through the return branch pipe 12. The outlet of the buffer tank 15 is connected to the circulating water tank 8 through the water supply pipe 16. A water supply pump 17 is installed on the water supply pipe 16. A thermometer and a liquid level sensor are installed in the circulating water tank 8. A drain pipe 18 with a drain valve 20 is connected to the bottom of the circulating water tank 8. A drain pump 19 is installed on the drain pipe 18.

[0025] The circulating water tank 8 is provided with observation windows 21 on its side for checking the liquid level.

[0026] In use, the low-temperature water in the circulating water tank 8 is pumped into the heat exchanger 4 of the heat exchange box 3 by the circulating water pump 7. The low-temperature water enters the inlet chamber 28 and then flows laterally through the tube bundle 30 below the baffle 29 to the receiving chamber 26 at the other end. During the flow, the oil inlet pipe 2 of the air compressor enters the inner cavity of the cylindrical shell 23. The staggered arrangement of the baffles 31 prolongs the flow time of the hot oil in the inner cavity. After the hot oil and the low-temperature water in the tube bundle 30 exchange heat, the temperature of the hot oil decreases and flows back into the air compressor through the return oil pipe 1, thereby reducing the air compressor's temperature. The operating load is controlled, and the low temperature water flows from the lower tube bundle 30 to the receiving cavity 26, and then from the receiving cavity 26 to the upper tube bundle 30 to the outlet cavity 27. The repeated flow increases the contact time between the low temperature water and the hot oil, thereby improving the heat exchange efficiency. After heat exchange, the low temperature water is heated and flows back to the circulating water tank 8 from the return water pipe 6 of the outlet cavity 27. After continuous circulation, the low temperature water in the circulating water tank 8 will continue to heat up until it meets the temperature requirements of production and domestic water. Then, it can be sent to the hot water pipeline for production and domestic use by the drain pump 19 through the drain pipe 18.

[0027] The specific steps are as follows:

[0028] The temperature of the circulating water is sensed by a thermometer inside the circulating water tank 8. Once the set temperature is reached, solenoid valves I9 and III13 close, disconnecting the connection between the circulating water tank 5 and the heat exchange box 4. Drain pump 19 is then activated to discharge the hot water from the circulating water tank 8 through drain pipe 18. Simultaneously, solenoid valve II10 is opened, connecting the inlet branch pipe 11 and the buffer water tank 15 to the heat exchange box 4. During the drainage process from the circulating water tank 8, water is replenished to the heat exchanger 4 via the inlet branch pipe 11, ensuring continuous heat exchange with the hot oil in the air compressor. The water is left in the buffer tank 15. After the level sensor in the circulating water tank 8 detects that the liquid level has reached the set level, the drain pump 19 and drain valve 20 are turned off, and the water replenishment pump 17 is started to replenish the water in the buffer tank 15 into the circulating water tank 8. After the water level in the circulating water tank 8 reaches the height set by the level sensor, the water replenishment pump 17, solenoid valve II10 and solenoid valve IV22 can be turned off, and solenoid valve I9 ​​and solenoid valve III13 can be turned on at the same time, so that the circulating water tank 8 is connected to the heat exchanger 4 again, so as to achieve continuous heat exchange.

[0029] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. An air compressor heat exchange device, characterized by: The application relates to a heat exchange box installed between an oil inlet pipe and an oil return pipe of an air compressor, wherein a heat exchanger is transversely arranged in the heat exchange box, the heat exchanger comprises a cylindrical shell, baffles are vertically and alternately arranged on the inner wall of the cylindrical shell along the axial direction, the two end faces of the cylindrical shell are respectively connected with tube plates, the two ends of the cylindrical shell are respectively connected with end covers provided outside the tube plates, the end cover and the corresponding tube plate form a containing cavity, a tube bundle penetrating through the baffles is fixedly connected between the two tube plates, the ends of the tube bundle penetrate through the two tube plates and are communicated with the containing cavities, the containing cavity on one side is divided into an upper liquid outlet cavity and a lower liquid inlet cavity by a partition plate, a water inlet pipe communicated with the liquid inlet cavity and a water return pipe communicated with the liquid outlet cavity are connected with the end cover, a circulating water tank is connected between the water inlet pipe and the water return pipe, a circulating water pump is installed on the water inlet pipe, an exhaust port is arranged on the top of the circulating water tank and an exhaust valve is installed on the exhaust port, an oil return port is arranged on the side wall of one end of the cylindrical shell close to the water inlet pipe and connected with the oil return pipe, and an oil inlet port is arranged on the side wall of the other end of the cylindrical shell away from the water inlet pipe and connected with the oil inlet pipe.

2. The air compressor heat exchange device according to claim 1, characterized in that: An electromagnetic valve I is installed on the water inlet pipe between the circulating water tank and the circulating water pump, a water inlet branch pipe provided with an electromagnetic valve II is connected between the electromagnetic valve I and the circulating water pump, an electromagnetic valve III is installed on the water return pipe, a water return branch pipe provided with an electromagnetic valve IV is connected between the electromagnetic valve III and the heat exchange box, a buffer water tank is connected through the water return branch pipe, a water outlet of the buffer water tank is communicated with the circulating water tank through a water supplement pipe, a water supplement pump is installed on the water supplement pipe, a thermometer and a liquid level sensor are respectively installed in the circulating water tank, a drain pipe provided with a drain valve is connected to the bottom of the circulating water tank, and a drain pump is installed on the drain pipe.

3. The air compressor heat exchange device according to claim 2, characterized in that: Observation windows for observing the liquid level are arranged on the side of the circulating water tank.

4. The air compressor heat exchange device of claim 1, wherein: Thermal insulation materials are filled between the inner wall of the heat exchange box and the heat exchanger, and the circulating water tank is covered with thermal insulation materials.

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