Waste heat recovery device of air compressor

Abstract

The utility model discloses a waste heat recovery device of an air compressor, and belongs to the technical field of air compressors. Comprising an air compressor, a conveying pipe is arranged on the side wall of the air compressor, a recovery assembly is arranged at one end of the conveying pipe, a water storage tank is arranged at the other end of a water outlet pipe, and a separation assembly is arranged at the other end of a heat exchange pipe. A high-temperature oil-gas mixture is conveyed into the heat exchange pipe through the conveying pipe, the first valve is opened, cold water is added from the water inlet pipe, the heat exchange pipe heats the cold water, the heat exchange efficiency is improved through the fins, the cold water is prompted to be transited to turbulent flow from laminar flow in advance through the penetrating holes, and heat transfer on the surfaces of the fins is enhanced. The second valve is opened to convey the heated water into the water storage tank, oil-gas separation is conducted on the oil-gas mixture through the separation assembly, and the separated lubricating oil enters the air compressor again to avoid waste. The structure design is high in heat exchange efficiency and heat utilization rate, lubricating oil can be recycled conveniently, and waste is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of air compressors, and more specifically, to a waste heat recovery device for an air compressor. Background Art

[0002] An air compressor is a device used to compress gas. Its structure is similar to that of a water pump. Most air compressors are reciprocating pistons with rotating blades or screws. During operation, air compressors generate a large amount of waste heat. Traditionally, this heat has been discharged into the air through radiators and cooling fans, leaving this heat unused. This has led to high operating costs and environmental pollution.

[0003] The patent document with publication number CN219974722U in the prior art provides an air compressor waste heat recovery device, which is fixedly connected to sliders at both ends of a movable partition, and a connecting rod is fixedly connected under the two sliders, and a plug is fixedly connected to the bottom end of the two connecting rods. A slide groove that matches the slider, connecting rod and plug is provided on both sides of the exhaust cavity, and a spring is fixedly connected between the top of the slide groove and the slider. The height of the slide groove is greater than or equal to the sum of the natural state height of the slider and the spring, the connecting rod, the plug and the vent height, so that excess hot air is automatically discharged and the water tank continues to be heated to prevent personal injury.

[0004] Although the device has many beneficial effects, the following problems still exist: during the use of the device, the water body is heated only by the movable baffle, which is inefficient and causes excessive heat loss; secondly, the oil and gas mixture is discharged during the use of the device, causing waste and needing improvement. In view of this, we propose an air compressor waste heat recovery device. Utility Model Content

[0005] 1. Technical problems to be solved

[0006] The purpose of the utility model is to provide an air compressor waste heat recovery device to solve the problems raised in the above background technology that the existing water heating method that relies solely on movable baffles has low efficiency, excessive heat loss, and waste caused by oil and gas mixed discharge.

[0007] 2. Technical solution

[0008] A waste heat recovery device for an air compressor comprises an air compressor, a delivery pipe is provided on the side wall of the air compressor, a recovery component is provided at one end of the delivery pipe, the recovery component comprises a recovery box, a heat exchange pipe is provided on the side wall of the inner cavity of the recovery box, a plurality of fins are provided on the circumferential outer wall of the heat exchange pipe, a plurality of through holes are arranged in an array on both sides of the side wall of the fin, a water inlet pipe is provided on the top of the recovery box, a first valve is provided on the circumferential outer wall of the water inlet pipe, a water outlet pipe is provided on the side wall of the recovery box, a second valve is provided on the circumferential outer wall of the water outlet pipe, a water storage tank is provided at the other end of the water outlet pipe, and a separation component is provided at the other end of the heat exchange pipe.

[0009] Preferably, the separation component includes a feeding pipe, an oil separator is provided at the other end of the feeding pipe, an exhaust port is provided at the top of the oil separator, a return pipe is provided at the bottom of the circumferential outer wall of the oil separator, and a float valve is provided on the circumferential inner wall of the oil separator.

[0010] Preferably, a plurality of temperature gauges are provided on one side of the top of the recovery box, and a pressure gauge is provided on the other side of the top of the recovery box.

[0011] Preferably, the heat exchange tube is arranged in an S shape, and one end of the heat exchange tube is fixedly connected to the delivery pipe.

[0012] Preferably, the thickness of the fin is 4.2 mm, and the perforations are long waist holes.

[0013] Preferably, the surface of the water tank is made of stainless steel, and the inner core of the water tank is made of polystyrene.

[0014] Preferably, sealing flanges are provided at both ends of the heat exchange tube, and the first valve and the second valve are both pneumatic O-type ball valves.

[0015] 3. Beneficial effects

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] The utility model delivers the high-temperature oil-gas mixture to the interior of the heat exchange tube through the delivery pipe, opens the first valve to add cold water from the water inlet pipe, and the heat exchange tube heats the cold water. The fins improve the heat exchange efficiency, and the perforations cause the cold water to transition from laminar flow to turbulent flow in advance, thereby enhancing the heat transfer on the fin surface. The second valve is opened to deliver the heated water to the interior of the water storage tank.

[0018] Secondly, the oil-gas mixture is transported to the oil separator through the feed pipe for oil-gas separation, and the exhaust gas is discharged through the exhaust port. After a certain amount of separated lubricating oil accumulates, it drives the float valve to open, and then re-enters the air compressor through the return pipe to avoid waste; the structural design of the utility model has high heat exchange efficiency and high heat utilization rate, which is convenient for recycling and utilizing lubricating oil to avoid waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the recycling component of the utility model;

[0021] Figure 3 This is a schematic cross-sectional view of the structure of the recycling component of the present utility model;

[0022] Figure 4 It is a partial structural cross-sectional schematic diagram of the utility model;

[0023] Figure 5 This is a schematic cross-sectional view of a partial structure of a separation component of the present invention;

[0024] Explanation of the numbers in the figure: 1. Air compressor; 2. Delivery pipe; 3. Recovery component; 4. Water storage tank; 5. Separation component; 301. Limit rail; 301. Recovery tank; 302. Heat exchange tube; 303. Fin; 304. Perforation; 305. Water inlet pipe; 306. First valve; 307. Water outlet pipe; 308. Second valve; 309. Thermometer; 310. Pressure gauge; 501. Feed pipe; 502. Oil separator; 503. Exhaust port; 504. Return pipe; 505. Float valve. DETAILED DESCRIPTION

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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, and therefore should not be understood as a limitation on the present invention.

[0026] In the description of the present invention, “plurality” means two or more, unless otherwise clearly defined.

[0027] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances.

[0028] See also Figure 1-5 ,The utility model provides a technical solution:

[0029] A waste heat recovery device for an air compressor comprises an air compressor 1, a delivery pipe 2 being fixedly provided on the side wall of the air compressor 1, a recovery component 3 being threadedly connected to one end of the delivery pipe 2, the recovery component 3 comprising a recovery box 301, a heat exchange tube 302 being fixedly provided on the inner side wall of the recovery box 301, a plurality of fins 303 being welded on the circumferential outer wall of the heat exchange tube 302, a plurality of through holes 304 being arranged in an array on both sides of the side wall of the fin 303, a water inlet pipe 305 being fixedly provided on the top of the recovery box 301, a first valve 306 being fixedly provided on the circumferential outer wall of the water inlet pipe 305, a water outlet pipe 307 being fixedly provided on the side wall of the recovery box 301, a second valve 308 being fixedly provided on the circumferential outer wall of the water outlet pipe 307, a water storage tank 4 being fixedly provided on the other end of the water outlet pipe 307, and a separation component 5 being threadedly connected to the other end of the heat exchange tube 302. The utility model delivers the high-temperature oil-gas mixture to the interior of the heat exchange tube 302 through the delivery pipe 2, opens the first valve 306 to add cold water from the water inlet pipe 305, and the heat exchange tube 302 heats the cold water. The heat exchange efficiency is improved through the fins 303, and the cold water is prompted to transition from laminar flow to turbulent flow in advance through the perforations 304, so that the heat transfer on the surface of the fins 303 is enhanced. The second valve 308 is opened to deliver the heated water to the interior of the water storage tank 4.

[0030] Specifically, the separation assembly 5 includes a feed pipe 501, with an oil separator 502 fixedly mounted at the other end. An exhaust port 503 is fixedly mounted at the top of the oil separator 502. A return pipe 504 is fixedly mounted at the bottom of the outer circumference of the oil separator 502. A float valve 505 is slidably connected to the inner circumference of the oil separator 502. The oil-gas mixture is transported through the feed pipe 501 to the interior of the oil separator 502 for oil-gas separation. Exhaust gas is discharged through the exhaust port 503. When a certain amount of separated lubricating oil accumulates, the float valve 505 opens, allowing the oil to re-enter the air compressor 1 through the return pipe 504 to avoid waste.

[0031] Furthermore, a plurality of thermometers 309 are fixed on one side of the top of the recovery box 301, and a pressure gauge 310 is fixed on the other side of the top of the recovery box 301. The temperature of the water inside the recovery box 301 is monitored by the thermometers 309. When the required temperature is reached, the second valve 308 is opened, and the pressure gauge 310 is used to prevent accidents caused by excessive pressure.

[0032] It is worth noting that the heat exchange tube 302 is arranged in an S shape, and one end of the heat exchange tube 302 is fixedly connected to the delivery pipe 2. The S-shaped heat exchange tube 302 increases the residence time of the high-temperature oil and gas mixture inside the recovery box 301, improves the heat utilization rate, and makes the heat exchange more sufficient.

[0033] It is worth noting that the thickness of the fin 303 is 4.2 mm, and the through hole 304 is a long waist hole. The 4.2 mm thickness of the fin 303 facilitates the adaptation to high temperature lubricating fluid.

[0034] Additionally, the surface of the water tank 4 is made of stainless steel, while the inner core is made of polystyrene. This polystyrene core enhances the thermal insulation performance of the water tank 4. Polyethylene's molecular structure inherently does not absorb water, and the front and back of the sheet are free of gaps. Its moisture permeability is less than 2.0 ng / (Pa.ms), and its volumetric water absorption after soaking is less than 1.0%. Its closed-cell structure makes it an environmentally friendly insulation material with favorable properties such as low thermal conductivity, high compressive strength, non-absorbency, lightweight, corrosion resistance, and a long service life. It is also non-breakable, easy to transport, lightweight to install, and easy to cut. Furthermore, it has high impact strength and maintains its strength even after prolonged foaming.

[0035] Furthermore, sealing flanges are welded to both ends of the heat exchange tube 302, and both the first valve 306 and the second valve 308 are pneumatic O-type ball valves. The sealing flanges improve sealing performance and prevent leakage of the high-temperature oil-gas mixture, while the pneumatic O-type ball valves allow for precise control of water inlet and outlet.

[0036] Working principle: When this device is needed to recover the waste heat of the air compressor, the high-temperature oil and gas mixture generated by the air compressor 1 is transported from the delivery pipe 2 to the inside of the heat exchange pipe 302, and the first valve 306 is opened to add cold water to the water inlet pipe 305. The heat exchange pipe 302 heats the cold water. Fins 303 are welded on the outer wall of the heat exchange pipe 302. The cold water is prompted to transition from laminar flow to turbulent flow in advance through the perforations 304. The water temperature inside the recovery box 301 is observed by the thermometer 309. When the required temperature is reached, the second valve 308 is opened to transport hot water to the inside of the water storage tank 4. The oil and gas mixture is transported from the feed pipe 501 to the inside of the oil separator 502 for oil and gas separation, and the exhaust gas is discharged from the exhaust port 503. After a certain amount of separated lubricating oil accumulates, it drives the float valve 505 to open and re-enters the air compressor 1 from the return pipe 504.

[0037] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An air compressor waste heat recovery device, comprising an air compressor (1), characterized in that: The air compressor (1) is provided with a delivery pipe (2) on the side wall, and a recovery component (3) is provided at one end of the delivery pipe (2). The recovery component (3) includes a recovery box (301), and a heat exchange pipe (302) is provided on the inner cavity side wall of the recovery box (301). The circumferential outer wall of the heat exchange pipe (302) is provided with a plurality of fins (303), and a plurality of perforations (304) are arranged in an array on both sides of the side wall of the fin (303). A water inlet pipe (305) is provided on the top of the recovery box (301), and a first valve (306) is provided on the circumferential outer wall of the water inlet pipe (305). A water outlet pipe (307) is provided on the side wall of the recovery box (301), and a second valve (308) is provided on the circumferential outer wall of the water outlet pipe (307). A water storage tank (4) is provided at the other end of the water outlet pipe (307), and a separation component (5) is provided at the other end of the heat exchange pipe (302).

2. The air compressor waste heat recovery device according to claim 1, characterized in that: The separation assembly (5) comprises a feed pipe (501), an oil separator (502) is provided at the other end of the feed pipe (501), an exhaust port (503) is provided at the top of the oil separator (502), a return pipe (504) is provided at the bottom of the circumferential outer wall of the oil separator (502), and a float valve (505) is provided on the circumferential inner wall of the oil separator (502).

3. The air compressor waste heat recovery device according to claim 2, characterized in that: A plurality of temperature gauges (309) are provided on one side of the top of the recovery box (301), and a pressure gauge (310) is provided on the other side of the top of the recovery box (301).

4. The air compressor waste heat recovery device according to claim 3, characterized in that: The heat exchange tube (302) is arranged in an S shape, and one end of the heat exchange tube (302) is fixedly connected to the delivery tube (2).

5. The air compressor waste heat recovery device according to claim 4, characterized in that: The thickness of the fin (303) is 4.2 mm, and the through hole (304) is a long waist hole.

6. The air compressor waste heat recovery device according to claim 5, characterized in that: The surface of the water storage tank (4) is made of stainless steel, and the inner core of the water storage tank (4) is made of polystyrene.

7. The air compressor waste heat recovery device according to claim 6, characterized in that: Both ends of the heat exchange tube (302) are provided with sealing flanges, and the first valve (306) and the second valve (308) are both pneumatic O-type ball valves.

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