Efficient waste heat recovery device for air compressor

Abstract

The invention belongs to the technical field of waste heat recovery equipment, and particularly relates to an efficient waste heat recovery device for an air compressor. The device comprises an underframe, and an oil-gas separator, a heat exchange cylinder, a water storage tank and a control panel which are mounted on the underframe, a cold water chamber, a preheating chamber and a heating chamber are sequentially arranged in the heat exchange cylinder from inside to outside, a spiral heat exchange gas pipe is arranged in the preheating chamber, the input end of the heat exchange gas pipe is connected with a gas inlet pipe, and the gas inlet pipe is connected with a gas outlet of the oil-gas separator; a spiral heat exchange channel is arranged in the heating chamber, a plurality of spiral heat exchange oil pipes are laid in the heat exchange channel, the input ends of the heat exchange oil pipes are connected with an oil inlet pipe, one end of the oil inlet pipe is connected with an oil outlet of the oil-gas separator, and the output ends of the heat exchange oil pipes are connected with an oil outlet pipe; cold water is primarily heated through the heat exchange air pipe, preheated water enters the heating chamber, then the water is further heated through the heat exchange oil pipe, and the cold water is heated to the high temperature more easily in a graded heating mode.

Description

Technical Field

[0001] The present invention relates to the technical field of heat recovery equipment, and in particular to a high-efficiency waste heat recovery device for an air compressor. Background Art

[0002] When an air compressor compresses air, mechanical energy is converted into heat energy, generating heat. The high-speed rotation of the compressor screw generates high-temperature heat, and friction also generates heat. The heat carried by the high-temperature, high-pressure oil and gas is roughly equivalent to 1 / 4 of the air compressor's power, and its temperature is usually between 80-100 degrees Celsius. This heat energy is discharged into the atmosphere, resulting in heat waste.

[0003] The existing patent with publication number CN108150421B discloses an air compressor waste heat recovery system, including an air compressor, an exhaust pipe, an oil circulation loop, an oil-gas separator, an insulated water tank and a control system. Both ends of the oil circulation loop are connected to the air compressor, the oil-gas separator is arranged on the oil circulation loop, and the exhaust pipe is connected to the oil-gas separator. The cold water area of the insulated water tank is connected to an inlet pipe, and the hot water area is connected to an outlet pipe; the exhaust pipe and the oil circulation loop are both arranged through the cold water area. This invention recovers heat energy by storing the water heated by high-temperature air and high-temperature oil in the cold water area in the hot water area for standby use; however, in this invention, the exhaust pipe and the oil circulation loop are both arranged in the cold water area. If the water in the entire cold water area is heated to 80-90°C, the water temperature difference span is large, resulting in a too long heating time. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention provides an air compressor waste heat efficient recovery device, which heats the cold water in stages by providing a preheating chamber and a heating chamber in the heat exchange cylinder, aiming to solve the problems in the background technology.

[0005] In order to achieve the above technical objectives, the specific technical scheme of the present invention is as follows: the present invention proposes an air compressor waste heat efficient recovery device, comprising: a base frame, an oil-gas separator installed on the base frame, a heat exchange cylinder, a water storage tank and a control panel; the heat exchange cylinder is provided with a cold water chamber, a preheating chamber and a heating chamber from the inside to the outside, the preheating chamber is provided with a spiral heat exchange air pipe, the input end of the heat exchange air pipe is connected with an air inlet pipe, the air inlet pipe is connected with the air outlet of the oil-gas separator, and the output end of the heat exchange air pipe is connected with the air outlet pipe; a spiral heat exchange channel is provided in the heating chamber, and a plurality of spiral heat exchange oil pipes are laid in the heat exchange channel, the input end of the heat exchange oil pipe is connected with an oil inlet pipe, one end of the oil inlet pipe is connected with the oil outlet of the oil-gas separator, and the output end of the heat exchange oil pipe is connected with an oil outlet pipe; the cold water chamber is connected with a water inlet pipe, the heating chamber is connected with a water outlet pipe, and one end of the water outlet pipe is connected to the water storage tank.

[0006] Furthermore, a plurality of through holes are provided at the bottom of the cold water chamber, which are connected to the preheating chamber; and a pair of valve holes distributed up and down are provided on the preheating chamber, which are connected to the heating chamber, and a valve plate assembly is connected to the valve hole.

[0007] Furthermore, the valve plate assembly includes: a valve plate for sealing the valve hole; a drive motor for driving the valve plate to rise and fall, a screw rod fixedly connected to the drive motor shaft, and a threaded seat fixedly connected to the screw rod.

[0008] Furthermore, track grooves are symmetrically provided on both sides of the valve hole, slide rails slidably connected to the track grooves are provided on both sides of the valve plate, and a sealing gasket is fixedly connected to the surface of the valve plate.

[0009] Furthermore, the input end of the heat exchange oil pipe is connected to a diverter valve, which is connected to the oil inlet pipe; the output end of the heat exchange oil pipe is connected to a merging valve, which is connected to the oil outlet pipe; and the oil inlet pipe is connected to a first oil pump, and the oil outlet pipe is connected to a second oil pump.

[0010] Furthermore, a first water pump is installed on the water inlet pipe, a second water pump is installed on the water outlet pipe, and a circulating water pipe is connected between the water tank and the water inlet pipe, wherein a first solenoid valve is installed on the water inlet pipe, and a second solenoid valve is installed on the circulating water pipe.

[0011] Furthermore, a first liquid level sensor is installed on the heat exchange cylinder, and a second liquid level sensor is installed on the water storage tank.

[0012] Furthermore, a filter is installed on the water inlet pipe; the filter includes an outer shell, a front cover and a rear cover, and a multi-layer filter screen and a filter cartridge assembly are installed inside the outer shell.

[0013] Furthermore, the filter cartridge assembly includes a water permeable pipe, with a first pipe seat and a second pipe seat fixedly connected at both ends of the water permeable pipe. The outer periphery of the water permeable pipe is wrapped with a filter layer, and filter material is filled between the filter layer and the water permeable pipe.

[0014] The beneficial effects of the present invention are: 1. The present invention provides a preheating chamber and a heating chamber in the heat exchange cylinder. The cold water is preliminarily heated through the heat exchange gas pipe. The preheated water enters the heating chamber and is further heated through the heat exchange oil pipe. The staged heating method is adopted, which makes it easier to heat the cold water to a high temperature.

[0015] 2. The present invention provides a spiral heat exchange channel in the heating chamber. Warm water flows from top to bottom in the heat exchange channel, and hot oil in the heat exchange oil pipe flows from bottom to top, thereby achieving sufficient heat exchange between the hot oil and the warm water. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of an air compressor waste heat efficient recovery device proposed by the present invention.

[0017] Figure 2 This is a front view schematic diagram of an air compressor waste heat efficient recovery device proposed by the present invention.

[0018] Figure 3 This is a three-dimensional cross-sectional schematic diagram of the heat exchange tube proposed in the present invention.

[0019] Figure 4 This is a schematic front view of the cross section of the heat exchange tube proposed by the present invention.

[0020] Figure 5 This is a schematic structural diagram of the valve plate assembly proposed in the present invention.

[0021] Figure 6 This is a schematic structural diagram of the filter proposed in the present invention.

[0022] In the figure: 1. chassis; 2. oil-gas separator; 3. heat exchange cylinder; 301. heating chamber; 302. preheating chamber; 303. cold water chamber; 304. heat exchange oil pipe; 305. heat exchange gas pipe; 306. through hole; 307. valve plate assembly; 3071. valve plate; 3072. sealing gasket; 3073. slide rail; 3074. screw rod; 3075. drive motor; 3076. threaded seat; 308. valve hole; 309. track groove; 310. diverter valve; 311. converging valve; 4. water tank; 5. control panel; 6. first oil pump; 7. second oil pump; 8. First water pump; 9. Second water pump; 10. Oil inlet pipe; 11. Oil outlet pipe; 12. Air inlet pipe; 13. Air outlet pipe; 14. First solenoid valve; 15. Second solenoid valve; 16. Filter; 161. Housing; 162. Front end cover; 163. Rear end cover; 164. Filter screen; 165. Filter cartridge assembly; 1651. First pipe seat; 1652. Second pipe seat; 1653. Permeable pipe; 1654. Filter material; 1655. Filter screen layer; 17. First liquid level sensor; 18. Second liquid level sensor; 19. Water outlet pipe; 20. Water inlet pipe; 21. Circulating water pipe. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] Embodiment: This embodiment discloses an air compressor waste heat high efficiency recovery device, such as Figures 1-6As shown, it includes: a base frame 1, an oil-gas separator 2 installed on the base frame 1, a heat exchange cylinder 3, a water storage tank 4 and a control panel 5; wherein, a first liquid level sensor 17 is installed on the heat exchange cylinder 3 for monitoring the water level in the heat exchange cylinder 3, and a second liquid level sensor 18 is installed on the water storage tank 4 for monitoring the water level on the water storage tank 4. Temperature sensors are also provided in the water storage tank 4 and the heat exchange cylinder 3; a cold water chamber 303, a preheating chamber 302 and a heating chamber 301 are provided in the heat exchange cylinder 3 from the inside to the outside, and a spiral heat exchange air pipe 305 is provided in the preheating chamber 302, wherein the input end of the heat exchange air pipe 305 is connected to the air inlet pipe 12, and the air inlet pipe 12 is connected to the outlet of the oil-gas separator 2, and the separated hot air flow preheats the cold water when passing through the heat exchange air pipe 305, thereby initially increasing the temperature of the cold water; the output end of the heat exchange air pipe 305 is connected to the outlet pipe 13, and the outlet pipe 13 extends to the outside of the heat exchange cylinder 3; the end of the outlet pipe 13 can be connected to the exhaust gas purifier according to actual needs; a spiral heat exchange channel is provided in the heating chamber 301, and a plurality of spiral heat exchange oil pipes 304 are laid in the heat exchange channel, wherein the hot oil flows upward in the heat exchange oil pipe 304, and the input end of the heat exchange oil pipe 304 is connected to the diverter valve 310, which is used to divert the hot oil to each In the heat exchange oil pipe 304, the diverter valve 310 is connected to the oil inlet pipe 10, the oil inlet pipe 10 is connected to the oil outlet of the oil-gas separator 2, and the oil inlet pipe 10 is connected to the first oil pump 6; the output end of the heat exchange oil pipe 304 is connected to the merging valve 311, and the output end of the merging valve 311 is connected to the oil outlet pipe 11. The merging valve 311 is used to merge the hot oil of each heat exchange oil pipe 304 together, the merging valve 311 is connected to the oil outlet pipe 11, the oil outlet pipe 11 is connected to the second oil pump 7, and the end of the oil outlet pipe 11 is connected to the air compressor. After heat exchange, the lubricating oil flows back to the air compressor; the cold water chamber 303 is connected to the water inlet pipe 20, and the first water inlet pipe 20 is installed on the water inlet pipe Pump 8, the heating chamber 301 is connected to a water outlet pipe 19, one end of the water outlet pipe 19 is connected to the water storage tank 4, and a second water pump 9 is installed on the water outlet pipe 19, and the second water pump 9 pumps the hot water in the heating chamber into the water storage tank 4; in this embodiment, the water in the preheating chamber 302 is preliminarily heated to 30-40°C through the heat exchange air pipe 305, and the heated warm water enters the heating chamber 301, and the warm water flows from top to bottom in the heat exchange channel, and the hot oil flows from bottom to top in the heat exchange oil pipe 304, further heating the warm water to 80-90°C. The cold water is heated by gradual heating, which makes it easier to heat the water to a high temperature and improves the heat exchange effect.

[0025] Preferably, Figure 3 and Figure 5As shown, a plurality of through holes 306 are provided at the bottom of the cold water chamber 303, which are communicated with the preheating chamber 302, and the cold water in the cold water chamber 303 enters the preheating chamber 302 through the through holes 306; and a pair of valve holes 308 distributed up and down are provided on the preheating chamber 302, and the valve holes 308 are communicated with the heating chamber 301, and a valve plate assembly 307 is connected to the valve hole 308, wherein the valve plate assembly 307 includes: a valve plate 3071 for sealing the valve hole 308; a drive motor 3075 for driving the valve plate 3071 to rise and fall, a screw rod 3074 is fixedly connected to the rotating shaft of the drive motor 3075, and a threaded member threadedly connected to the screw rod 3074 is fixedly connected to the valve plate 3071. Seat 3076; the screw rod 3074 is driven to rotate by the driving motor 3075, driving the valve plate 3071 to move up and down; when the valve plate 3071 moves upward, the opening degree of the upper valve hole 308 becomes smaller, and the opening degree of the lower valve hole 308 becomes larger, and the water inlet of the lower valve hole 308 increases. At this time, the time and distance for water to pass through the heat exchange channel are shorter, and the water temperature output from the heating chamber 301 is lower; when the valve plate 3071 moves downward, the opening degree of the upper valve hole 308 becomes larger, and the opening degree of the lower valve hole becomes smaller, and the water inlet of the upper valve hole 308 increases. At this time, the time and distance for water to pass through the heat exchange channel are longer, and the water temperature output from the heating chamber 301 is higher, thereby controlling the output water temperature.

[0026] Preferably, track grooves 309 are symmetrically provided on both sides of the valve hole 308, and slide rails 3073 slidably connected to the track grooves 309 are provided on both sides of the valve plate 3071, and a sealing gasket 3072 is fixedly connected to the surface of the valve plate 3071 to increase the sealing degree of the valve hole 308 through the sealing gasket 3072; the sealing gasket 3072 is made of high-temperature resistant fluororubber or high-temperature resistant silicone rubber material.

[0027] Preferably, a circulating water pipe 21 is connected between the water storage tank 4 and the water inlet pipe 20, wherein a first solenoid valve 14 is installed on the water inlet pipe 20, and a second solenoid valve 15 is installed on the circulating water pipe 21; when the first solenoid valve 14 is opened and the second solenoid valve 15 is closed, water is replenished to the heat exchange cylinder 3 from the outside; when the first solenoid valve 14 is closed and the second solenoid valve 15 is opened, water can be replenished to the heat exchange cylinder 3 through the water storage tank 4, and the water in the water storage tank 4 is heated again to increase the water temperature in the water storage tank 4.

[0028] like Figure 6As shown, a filter 16 is installed on the water inlet pipe 20; the filter 16 includes an outer shell 161, a front end cover 162 and a rear end cover 163, and a multi-layer filter screen 164 and a filter cartridge assembly 165 are installed inside the outer shell 161; the filter cartridge assembly 165 includes a water permeable pipe 1653, and the first pipe seat 1651 and the second pipe seat 1652 are fixedly connected at both ends of the water permeable pipe 1653. The outer periphery of the water permeable pipe 1653 is wrapped with a filter screen layer 1655, and the space between the filter screen layer 1655 and the water permeable pipe 1653 is filled with filter material 1654, and the filter material 1654 is quartz sand; water enters the filter 16 from the front end cover 162, intercepts large particles of debris through the filter screen 164, then enters the water permeable pipe 1653 and flows around, is further filtered through the filter material 1654, and then flows out from the rear end cover 163.

[0029] Working principle: After the high-temperature oil and gas mixture coming out of the air compressor is separated by the oil-gas separator 2, the high-temperature gas enters the heat exchange air pipe 305 to preliminarily heat the cold water. The preheated warm water enters the heating chamber 301 and flows from top to bottom in the heat exchange channel. The high-temperature hot oil enters the heat exchange oil pipe 304 and flows from bottom to top to further heat the warm water. After heating, the warm water flows into the water storage tank 4 through the outlet pipe 19. After heat exchange, the hot oil circulates again to the air compressor. This embodiment preheats the cold water with hot gas first, and then further heats the warm water with hot oil. A graded heating method is adopted to make it easier to heat the cold water to a high temperature state.

[0030] Finally, it should be noted that in the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0031] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An air compressor waste heat efficient recovery device, characterized in that: include: A base frame (1), an oil-gas separator (2) mounted on the base frame (1), a heat exchange cylinder (3), a water storage tank (4), and a control panel (5); The heat exchange tube (3) is provided with a cold water chamber (303), a preheating chamber (302) and a heating chamber (301) in sequence from the inside to the outside. A spiral heat exchange air pipe (305) is provided in the preheating chamber (302). The input end of the heat exchange air pipe (305) is connected to an air inlet pipe (12). The air inlet pipe (12) is connected to the air outlet of the oil-gas separator (2). The output end of the heat exchange air pipe (305) is connected to an air outlet pipe (13). A spiral heat exchange channel is provided in the heating chamber (301), and a plurality of spiral heat exchange oil pipes (304) are laid in the heat exchange channel. The input end of the heat exchange oil pipe (304) is connected to the oil inlet pipe (10), one end of the oil inlet pipe (10) is connected to the oil outlet of the oil-gas separator (2), and the output end of the heat exchange oil pipe (304) is connected to the oil outlet pipe (11); The cold water chamber (303) is connected to a water inlet pipe (20), the heating chamber (301) is connected to a water outlet pipe (19), and one end of the water outlet pipe (19) is connected to a water storage tank (4).

2. The air compressor waste heat efficient recovery device according to claim 1, characterized in that: The bottom of the cold water chamber (303) is provided with a plurality of through holes (306), which are in communication with the preheating chamber (302); and the preheating chamber (302) is provided with a pair of valve holes (308) distributed up and down, which are in communication with the heating chamber (301), and the valve holes (308) are connected to a valve plate assembly (307).

3. The air compressor waste heat efficient recovery device according to claim 2, characterized in that: The valve plate assembly (307) comprises: a valve plate (3071) for sealing the valve hole (308); a drive motor (3075) for driving the valve plate (3071) to rise and fall, a screw rod (3074) being fixedly connected to the rotating shaft of the drive motor (3075), and a threaded seat (3076) being threadedly connected to the screw rod (3074) being fixedly connected to the valve plate (3071).

4. The air compressor waste heat efficient recovery device according to claim 3, characterized in that: Track grooves (309) are symmetrically provided on both sides of the valve hole (308), slide rails (3073) slidably connected to the track grooves (309) are provided on both sides of the valve plate (3071), and a sealing gasket (3072) is fixedly connected to the surface of the valve plate (3071).

5. The air compressor waste heat efficient recovery device according to claim 4, characterized in that: The input end of the heat exchange oil pipe (304) is connected to a diverter valve (310), which is connected to the oil inlet pipe (10); the output end of the heat exchange oil pipe (304) is connected to a merging valve (311), which is connected to the oil outlet pipe (11); the oil inlet pipe (10) is connected to a first oil pump (6), and the oil outlet pipe (11) is connected to a second oil pump (7).

6. The air compressor waste heat efficient recovery device according to claim 5, characterized in that: A first water pump (8) is installed on the water inlet pipe (20), a second water pump (9) is installed on the water outlet pipe (19), and a circulating water pipe (21) is connected between the water storage tank (4) and the water inlet pipe (20), wherein a first solenoid valve (14) is installed on the water inlet pipe (20), and a second solenoid valve (15) is installed on the circulating water pipe (21).

7. The air compressor waste heat efficient recovery device according to claim 6, characterized in that: A first liquid level sensor (17) is installed on the heat exchange cylinder (3), and a second liquid level sensor (18) is installed on the water storage tank (4).

8. The air compressor waste heat efficient recovery device according to claim 7, characterized in that: A filter (16) is installed on the water inlet pipe (20); the filter (16) comprises a housing (161), a front end cover (162) and a rear end cover (163); and a multi-layer filter screen (164) and a filter cartridge assembly (165) are installed inside the housing (161).

9. The air compressor waste heat efficient recovery device according to claim 8, characterized in that: The filter cartridge assembly (165) comprises a water permeable pipe (1653), with a first pipe seat (1651) and a second pipe seat (1652) fixedly connected at both ends of the water permeable pipe (1653), a filter screen layer (1655) wrapped around the periphery of the water permeable pipe (1653), and filter material (1654) filled between the filter screen layer (1655) and the water permeable pipe (1653).

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