Air compressor based on waste heat recovery

Abstract

The invention relates to the technical field of waste heat recovery of air compressors, and discloses an air compressor based on waste heat recovery, which comprises a motor driving assembly, an air compressor main body, an oil-gas separator, a heat exchanger, a positioning plate and an equipment frame, and is characterized in that the motor driving assembly, the air compressor main body, the oil-gas separator and the heat exchanger are connected in series; the oil outlet quantity of the oil quantity adjusting pump is adjusted through the transmission mechanism, the oil injection quantity can be adaptively adjusted along with the rotating speed of the main shaft of the air compressor, different high-speed and low-speed working conditions can be adapted without a complex electric control system, the problems of insufficient cooling under the high-speed working condition and excessive cooling under the low-speed working condition are solved, the equipment cost and the environmental interference influence are reduced, and the working efficiency is improved. The adjusting reliability is improved, the stability and reliability of waste heat recovery are effectively improved, secondary recovery of waste heat of engine oil and compressed air is achieved through the heat exchanger, the energy utilization rate is greatly improved, and the energy-saving effect is achieved.

Description

Technical Field

[0001] This invention belongs to the field of waste heat recovery technology for air compressors, and specifically relates to an air compressor based on waste heat recovery. Background Technology

[0002] In industrial production, air compressors are widely used as core power equipment. During operation, they generate a lot of waste heat. When air is compressed, it follows the principle of adiabatic compression, and the temperature rises sharply (for example, when atmospheric air is compressed to 0.8MPa, the temperature can rise to 120-180℃). If the temperature is not cooled in time, the high temperature will cause the main rotor, cylinder and other components to deform, and may even cause the lubricating oil to carbonize and spontaneously combust.

[0003] Directly discharging waste heat would result in energy waste. Therefore, existing air compressors will be equipped with waste heat recovery devices for heat recovery and reuse. Traditional air compressors typically employ a constant oil injection design. After the oil is continuously injected into the compression chamber, it mixes thoroughly with the high-temperature air, quickly absorbing the heat generated by compression and controlling the temperature of the compression chamber within a safe range of 80-100℃. This prevents the equipment from shutting down due to high-temperature malfunctions. However, the fixed oil injection cannot adapt to the needs of different operating speeds. At high speeds, a fixed oil injection volume is insufficient to meet cooling requirements, easily leading to excessively high temperatures in the air compressor body and affecting the equipment's lifespan. At low speeds, excessive oil injection can cause overcooling, significantly reducing waste heat utilization efficiency.

[0004] In addition, some existing oil injection adjustment schemes use electric control, which requires real-time monitoring of multiple operating data of the air compressor. This not only results in high equipment costs, but also makes the sensors susceptible to interference from factors such as dust and vibration in the industrial environment, leading to poor adjustment reliability. Meanwhile, the transmission mechanism is prone to wear and debris accumulation during high-frequency contact friction, which further affects the transmission accuracy and equipment stability. Summary of the Invention

[0005] This invention provides an air compressor based on waste heat recovery, which solves the technical problems in related technologies such as the inability of traditional air compressors to adapt the oil injection volume to different speed conditions and the high cost and low reliability of electric adjustment.

[0006] This invention provides an air compressor based on waste heat recovery, including a motor drive assembly, an air compressor body, an oil-gas separator, and a heat exchanger. The motor drive assembly, air compressor body, oil-gas separator, and heat exchanger are connected in series to form an oil-gas treatment and waste heat recovery passage. The air compressor body is used to compress air and discharge it into the oil-gas separator. The liquid inlet end of the air compressor body is connected to an oil recovery and control mechanism. The oil recovery and control mechanism includes an oil volume regulating pump installed in the oil inlet passage of the air compressor body. The oil volume regulating pump includes a pump body and a motor and rotor assembly. The rotor of the motor and rotor assembly is located inside the pump body. A stator is movably installed on the inner wall of the pump body. The rotor of the motor and rotor assembly is located at the eccentric position of the stator. An adjustable oil pumping space is formed between the stator and the rotor. The oil pumping space is connected to the oil inlet passage. The regulating end of the oil volume regulating pump is fixedly connected to a transmission mechanism. The power input end of the transmission mechanism is connected to the main shaft of the air compressor body. The transmission mechanism receives the speed signal of the main shaft of the air compressor body and drives the stator inside the oil volume regulating pump to move, changing the eccentricity between the stator and the rotor, thereby realizing the adjustment of the oil displacement. The output drive rate of the transmission mechanism is positively correlated with the speed change of the air compressor body, and the output drive rate of the transmission mechanism is positively correlated with the volume change of the pump oil space.

[0007] In a preferred embodiment, the base of the motor drive assembly is fixedly connected to an equipment frame, and a positioning plate is fixedly installed on one side of the equipment frame to determine the position of the air compressor body. An air filter is fixedly connected to the air inlet end of the air compressor body, an oil tank is connected to the oil inlet end of the oil quantity regulating pump, a conveying pipe is connected between the oil tank and the return end of the heat exchanger, a booster pump is installed in the middle section of the conveying pipe, a return pipe is connected to the oil outlet end of the oil quantity regulating pump, and an adapter is installed at the end of the return pipe. The adapter is fixedly installed at the junction of the air filter and the air compressor body.

[0008] In a preferred embodiment, blades are evenly spaced along the edge of the rotor. During operation, the rotor of the motor and rotor assembly rotates at high speed, and centrifugal force causes the ends of the blades to contact the inner wall of the stator and form a sealed cavity. A thickened part is provided on the top of the pump body, and a receiving cavity is opened inside the thickened part. A protrusion is provided at the edge of the stator, and the protrusion is slidably disposed inside the receiving cavity. A clamping bolt is threadedly installed at the outlet of the receiving cavity, and a first spring is fixedly connected between the clamping bolt and the protrusion.

[0009] In a preferred embodiment, a transmission rod is fixedly connected to the bottom of the stator, and a protective part is integrally formed at the bottom of the pump body. The transmission rod is slidably disposed inside the protective part. During adjustment, the transmission mechanism pushes the stator to move radially along the pump body through the transmission rod, thereby adjusting the size of the sealed cavity to control the flow rate.

[0010] In a preferred embodiment, the heat exchanger is a double-loop plate heat exchanger. A positioning frame is fixedly installed inside the heat exchanger along its own length. The positioning frame is a fixed rod structure, and multiple plates are sleeved on the fixed rod. Each plate is divided into a first heat exchange plate and a second heat exchange plate, and the first heat exchange plate and the second heat exchange plate are alternately arranged. A closed panel is fixedly installed at both ends of the positioning frame. The closed panel is in contact with the outermost plate, and an annular sealing gasket is provided on the contact surface. Sealing gaskets are provided on the edges of adjacent first heat exchange plates and second heat exchange plates. An oil flow area is formed between the first heat exchange plate and one side of the second heat exchange plate, and a circulating water flow area is formed between the first heat exchange plate and the other side of the second heat exchange plate.

[0011] In a preferred embodiment, two sets of input pipes and two sets of output pipes are fixedly installed on the closed panel. One input pipe and one output pipe are provided with connecting holes at the corresponding oil flow area. Oil enters the corresponding oil flow area through the input pipe and flows out through the output pipe for circulation. The other input pipe and the other output pipe are provided with connecting holes at the corresponding circulating water flow area. Circulating water enters the corresponding circulating water flow area through the input pipe and flows out through the output pipe for circulation.

[0012] In a preferred embodiment, the transmission mechanism includes a driven wheel, which is connected to the main shaft of the air compressor body via a transmission belt or chain. A turntable is fixedly connected to one side of the driven wheel. The connecting shaft between the driven wheel and the turntable is rotatably connected to the protective shell, and a bearing is provided at the junction. A push rod is inserted into the inside of the protective shell. An independent housing is also provided inside the protective shell. A diversion pipe is connected between the independent housing and the oil storage tank. A magnet is inserted into the bottom of the independent housing.

[0013] In a preferred embodiment, a conical block is inserted into the other side of the turntable, a hollow frame is fixedly connected to the end of the push rod, a ball bearing is rotatably installed at the bottom of the inner side of the hollow frame, the ball bearing rolls in contact with the edge of the conical block, a third spring is fixedly connected between the hollow frame and the protective shell, the third spring is sleeved on the outside of the push rod, and the other end of the push rod is fixedly connected to the transmission rod.

[0014] In a preferred embodiment, a movable rod is provided radially at the edge of the turntable, and a trapezoidal connecting plate is provided at the end of the movable rod located inside the turntable. A trapezoidal cavity is provided inside the conical block, and the trapezoidal connecting plate is located inside the trapezoidal cavity, with the inclined surface of the trapezoidal connecting plate in sliding contact with the inclined surface of the conical block.

[0015] In a preferred embodiment, a second spring is fixedly connected between the conical block and the turntable, and between the movable rod and the turntable. An anti-detachment cavity is provided inside the turntable, located at the edge of the conical block. The beneficial effects of this invention are as follows: This invention regulates the oil output of the oil regulating pump through a transmission mechanism, and the oil injection volume is adaptively adjusted according to the rotational speed of the air compressor spindle. It can adapt to different working conditions at high and low speeds without the need for a complex electrical control system. This solves the problems of insufficient cooling at high speeds and excessive cooling at low speeds, while also reducing equipment costs and environmental interference, improving regulation reliability, and effectively enhancing the stability and reliability of waste heat recovery. The use of a heat exchanger enables secondary recovery of waste heat from the oil and compressed air, significantly improving energy utilization and achieving energy-saving effects.

[0016] This invention integrates an independent lubrication and impurity filtration structure. By diverting oil supply through an oil storage tank and forming a stable oil film between the conical block and the ball bearings, it reduces contact friction and wear of the transmission mechanism, extends the service life of components, and, with the addition of a magnetic block to adsorb metal shavings, avoids the impact of shavings accumulation on transmission accuracy and improves the operational stability of the equipment. Attached Figure Description

[0017] Figure 1 This is the overall assembly drawing of the present invention.

[0018] Figure 2 This is a schematic diagram showing the disassembled positioning plate and equipment frame structure of the present invention.

[0019] Figure 3 This is a schematic diagram of the air compressor body, oil recovery and control mechanism, and heat exchanger structure of the present invention.

[0020] Figure 4 This is a schematic diagram of the planar structure of the oil recovery and control mechanism and the transmission mechanism of the present invention.

[0021] Figure 5 This is a three-dimensional structural diagram of the oil recovery and control mechanism of the present invention.

[0022] Figure 6 This is a structural breakdown diagram of the oil recovery and control mechanism and the transmission mechanism of the present invention.

[0023] Figure 7 This is the present invention. Figure 6 Enlarged structural diagram of part A.

[0024] Figure 8 This is a side view of the conical block and the oil volume regulating pump assembled according to the present invention.

[0025] Figure 9 This is a schematic diagram of the planar structure of the turntable and conical block of the present invention. Figure 10 This is a schematic diagram of the internal structure of the oil quantity regulating pump of the present invention.

[0026] Figure 11 This is a schematic diagram of the internal planar structure of the heat exchanger of the present invention.

[0027] Figure 12 This is a schematic diagram of the planar structure of the first heat exchange plate of the present invention.

[0028] Figure 13 This is a schematic diagram of the planar structure of the second heat exchange plate of the present invention.

[0029] In the diagram: 1. Motor drive assembly; 2. Air compressor body; 3. Oil recovery and control mechanism; 31. Oil tank; 32. Protective shell; 33. Booster pump; 34. Adapter; 35. Oil quantity regulating pump; 351. Motor and rotor assembly; 352. Stator; 353. Clamping bolt; 354. Protrusion; 355. Thickened part; 356. Receiving cavity; 357. First spring; 358. Blade; 359. Sealed cavity; 36. Return pipe; 37. Delivery pipe; 38. Protective part; 39. Transmission rod; 310. Independent housing; 311. Diverter pipe 312. Magnet block; 4. Air filter; 5. Oil-gas separator; 6. Heat exchanger; 61. Positioning frame; 62. First heat exchange plate; 63. Second heat exchange plate; 64. Enclosed panel; 65. Input pipe; 66. Output pipe; 7. Positioning plate; 8. Equipment frame; 9. Transmission mechanism; 91. Driven wheel; 92. Turntable; 93. Hollow frame; 94. Ball bearing; 95. Conical block; 96. Movable rod; 97. Push rod; 98. Third spring; 99. Second spring; 910. Trapezoidal cavity; 911. Trapezoidal connecting plate; 912. Anti-detachment cavity. Detailed Implementation

[0030] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content. Example

[0031] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, an air compressor based on waste heat recovery includes a motor drive assembly 1, an air compressor body 2, an oil-gas separator 5, and a heat exchanger 6. The motor drive assembly 1, the air compressor body 2, the oil-gas separator 5, and the heat exchanger 6 are connected in series to form an oil-gas treatment and waste heat recovery passage. The air compressor body 2 is used to compress air and discharge it into the oil-gas separator 5. The liquid inlet end of the air compressor body 2 is connected to an oil recovery and control mechanism 3. The oil recovery and control mechanism 3 includes an oil volume regulating pump 35 installed in the oil inlet passage of the air compressor body 2. The oil volume regulating pump 35 includes a pump body and a motor and rotor assembly 351. The rotor of the motor and rotor assembly 351 is located inside the pump body. A stator 352 is movably arranged on the inner wall of the pump body. The rotor of the motor and rotor assembly 351 is located at the eccentric position of the stator 352. An adjustable oil pumping space is formed between the stator 352 and the rotor. The oil pumping space is connected to the oil inlet passage. The regulating end of the oil volume regulating pump 35 is fixedly connected to the transmission mechanism 9. The power input end of the transmission mechanism 9 is connected to the main shaft of the air compressor body 2. The transmission mechanism 9 drives the stator 352 inside the oil volume regulating pump 35 to move by receiving the speed signal of the main shaft of the air compressor body 2, thereby changing the eccentricity between the stator 352 and the rotor, and thus realizing the adjustment of the oil displacement. The output driving speed of the transmission mechanism 9 is positively correlated with the speed change of the air compressor body 2, and the output driving speed of the transmission mechanism 9 is positively correlated with the volume change of the pump oil space.

[0032] It should be noted that, as Figure 11 , Figure 12 and Figure 13As shown, heat exchanger 6 is a double-loop plate heat exchanger. A positioning frame 61 is fixedly installed inside heat exchanger 6 along its length. The positioning frame 61 is a fixed rod structure, with multiple plates sleeved on the fixed rod. Each plate is divided into a first heat exchange plate 62 and a second heat exchange plate 63, which are alternately arranged. A sealing panel 64 is fixedly installed at both ends of the positioning frame 61. The sealing panel 64 is in contact with the outermost plate, and an annular sealing gasket is provided on the contact surface. Limit bolts are installed at the ends of the positioning frame 61 to fix the sealing panel 64, used to press the first heat exchange plate 62 and the second heat exchange plate 63. Sealing gaskets are provided at the edges of adjacent first heat exchange plates 62 and second heat exchange plates 63. An oil flow area is formed between the first heat exchange plate 62 and one side of the second heat exchange plate 63, and a circulating water flow area is formed between the first heat exchange plate 62 and the other side of the second heat exchange plate 63. Two sets of inlet pipes are fixedly installed on the sealing panel 64. The system includes an input pipe 65 and two sets of output pipes 66. One input pipe 65 is connected to the oil-gas separator 5, and the other input pipe 65 is connected to an external circulating water supply device. One output pipe 66 is connected to the oil storage tank 31, and the other output pipe 66 is connected to an external circulating water storage device. One input pipe 65 and one output pipe 66 are provided with connecting holes at the corresponding oil flow areas, so that the input pipe 65 and the output pipe 66 are connected to each oil flow area, forming an oil circulation path. The oil enters the corresponding oil flow area through the input pipe 65 and flows out through the output pipe 66 for circulation. The other input pipe 65 and the other output pipe 66 are provided with connecting holes at the corresponding circulating water flow areas, so that the input pipe 65 and the output pipe 66 are connected to each circulating water flow area, forming a circulating water circulation path. The circulating water enters the corresponding circulating water flow area through the input pipe 65 and flows out through the output pipe 66 for circulation.

[0033] It should be further explained that during the flow of the high-temperature engine oil in the oil flow area, it exchanges heat with the low-temperature circulating water flowing in the circulating water area through the first heat exchange plate 62 and the second heat exchange plate 63. The cooled engine oil that has completed the heat exchange gathers in the bottom output pipe 66 and flows back to the oil storage tank 31, thus realizing the oil circulation. The low-temperature circulating water is evenly distributed to all the circulating water flow areas formed by the adjacent second heat exchange plate 63 and the first heat exchange plate 62 through another input pipe 65. The circulating water that has completed the heat exchange finally gathers in another output pipe 66 and flows into the external storage equipment.

[0034] The transmission mechanism 9 receives the speed signal of the main shaft of the air compressor body 2. When the speed increases, it drives the stator 352 inside the oil quantity regulating pump 35 to move, changing the eccentricity between the stator 352 and the rotor, thereby increasing the amount of oil discharged.

[0035] In this embodiment, the specific implementation scenario is as follows: the waste heat recovery air compressor is applied to the compressed air supply system of a small machining workshop. The waste heat recovery requirement is to meet the workshop's heating and hot water supply needs. The motor drive component 1 adopts a three-phase asynchronous motor. The transmission mechanism 9 is used to realize the linkage control between the speed and the displacement of the oil volume regulating pump 35. The transmission mechanism 9 receives the speed signal of the main shaft of the air compressor body 2 and drives the stator 352 inside the oil volume regulating pump 35 to move, changing the eccentricity between the stator 352 and the rotor, thereby realizing the displacement adjustment.

[0036] It should be noted that the protective shell 32 is used to protect the transmission mechanism 9. The air compressor body 2 adopts a twin-screw air compressor, which has intermeshing male and female rotors inside. When the motor drive assembly 1 is powered on, it drives the male and female rotors of the air compressor body 2 to rotate at high speed. After the outside air is filtered by the air filter 4 to remove dust and impurities, it is drawn into the compression chamber of the air compressor body 2. The transmission mechanism 9 rotates coaxially with the main shaft of the air compressor body 2. The eccentricity of the oil volume regulating pump 35 is automatically adjusted according to the real-time speed of the motor. In the low speed range (800-1000 r / min), the eccentricity decreases and the pump displacement decreases. In the high speed range (1200-1450 r / min), the eccentricity increases and the pump displacement increases. In other words, the oil displacement is adjusted by the change of the eccentricity.

[0037] It should be further explained that blades 358 are evenly spaced along the edge of the rotor. During operation, the rotor of the motor and rotor assembly 351 rotates at high speed. Centrifugal force causes the ends of the blades 358 to contact the inner wall of the stator 352, forming a sealed cavity 359. Initially, the eccentricity between the stator 352 and the rotor is a preset base value. When the main shaft of the air compressor body 2 rotates in the high-speed range, the transmission mechanism 9 pushes the stator 352 to increase the eccentricity, thereby increasing the maximum volume of the sealed cavity 359 formed between the stator 352 and the rotor, and increasing the oil output per rotation. When the shaft rotates at low speed, the eccentricity decreases, the maximum volume of the sealed cavity 359 decreases, and the amount of oil output per rotation decreases. The oil quantity regulating pump 35 pressurizes the oil in the oil tank 31 and sprays it into the compression chamber through the return pipe 36 and the adapter 34. After the oil and air are mixed in the compression chamber, they are continuously compressed as the male and female rotors rotate. During the mixing process, the oil absorbs the heat generated by compression and lubricates the male and female rotors, filling the rotor gap to achieve sealing, thereby realizing the integrated function of cooling, lubrication and sealing. The high-pressure oil-air mixture is discharged into the oil-air separator 5.

[0038] It should also be noted that the oil-gas separator 5 separates the high-pressure oil-gas mixture into high-pressure clean air and high-temperature engine oil through centrifugal separation and filtration. The principle of centrifugal separation can be referred to in the existing technology. It utilizes the density difference between oil droplets and air to cause the oil droplets to settle and separate under the action of centrifugal force. Then, the fine oil mist is intercepted by the filter element. The temperature of the separated high-temperature engine oil is about 80-100℃. It flows directly into the engine oil heat exchange circuit of the heat exchanger 6. In the heat exchanger 6, the high-temperature engine oil exchanges heat with the low-temperature circulating water. The temperature of the engine oil drops to 40-50℃. The circulating water absorbs heat and rises to 60-80℃. It is then transported to the workshop heating pipeline or the water tank of the employee bathroom to realize the first stage of waste heat recovery.

[0039] It should be further explained that the high-pressure clean air separated by the oil-gas separator 5 still retains approximately 60-70°C of residual heat. By setting up another heat exchanger 6 and connecting it to the air heat exchange circuit of the heat exchanger 6 via a dedicated pipeline, the low-temperature circulating water and the high-pressure air undergo a secondary heat exchange, further recovering the residual heat. At the same time, the temperature of the compressed air is reduced to prevent damage to the air storage tank due to high temperature. After the high-pressure air undergoes secondary waste heat recovery and its temperature drops to room temperature, it is transported to an external air storage tank for use by the workshop production equipment. After the circulating water that has completed the heat exchange is heated, it is connected to the heating or hot water supply system, realizing a second waste heat recovery, thereby achieving the purpose of energy saving.

[0040] The motor drive assembly 1, the air compressor body 2, and the oil-gas separator 5 are all existing and publicly available technologies, and will not be described in detail here. Example

[0041] like Figure 5 , Figure 6 and Figure 9As shown, the base of the motor drive assembly 1 is fixedly connected to the equipment frame 8. A positioning plate 7 is fixedly installed on one side of the equipment frame 8 to determine the position of the air compressor body 2. The air inlet end of the air compressor body 2 is fixedly connected to the air filter 4. The oil inlet end of the oil quantity regulating pump 35 is connected to the oil storage tank 31. A conveying pipe 37 is connected between the oil storage tank 31 and the return end of the heat exchanger 6. A booster pump 33 is installed in the middle section of the conveying pipe 37. The oil outlet end of the oil quantity regulating pump 35 is connected to the return pipe 36. An adapter 34 is installed at the end of the return pipe 36. The adapter 34 is fixedly installed between the air filter 4 and the air compressor body 2. At the junction, blades 358 are evenly spaced along the edge of the rotor. During operation, the rotor of the motor and rotor assembly 351 rotates at high speed. Centrifugal force causes the ends of the blades 358 to contact the inner wall of the stator 352 and form a sealed cavity 359. A thickened part 355 is provided on the top of the pump body. A receiving cavity 356 is provided inside the thickened part 355. A protrusion 354 is provided at the edge of the stator 352 and slides inside the receiving cavity 356. A clamping bolt 353 is threadedly installed at the outlet of the receiving cavity 356. A first spring 357 is fixedly connected between the clamping bolt 353 and the protrusion 354.

[0042] It should be noted that the equipment frame 8 and the positioning plate 7 are used to determine the positions of the motor drive assembly 1, the air compressor body 2, the oil-gas separator 5 and the oil recovery and control mechanism 3. The oil processed by the heat exchanger 6 is pumped back to the oil storage tank 31 through the conveying pipeline 37 and the pressurizing pump 33 to complete the closed-loop circulation of the oil.

[0043] The first spring 357 is a cylindrical helical compression spring made of stainless steel. Its preload can be adjusted by rotating the clamping bolt 353 to counteract the inertial impact when the stator 352 moves radially, ensuring the relative position of the stator 352 and the rotor is stable and preventing gap leakage in the sealed cavity 359. The protrusion 354 is set in the receiving cavity 356 to prevent the stator 352 from shaking.

[0044] In this embodiment, the specific implementation scenario is as follows: the motor and rotor assembly 351 drives the rotor to rotate at high speed. The blades 358 on the edge of the rotor extend outward under the action of centrifugal force, and the ends are closely attached to the inner sidewall of the stator 352. Several sealed cavities 359 are formed between adjacent blades 358 and the rotor and stator 352. During the rotation of the rotor, the volume of the sealed cavity 359 periodically expands and shrinks as the relative position of the blades 358 and the stator 352 changes, completing the basic cycle of oil suction and oil pressure, and realizing the continuous output of engine oil.

[0045] It should be noted that when adjusting the flow rate, the transmission mechanism 9 pushes the stator 352 to move radially along the pump body through the transmission rod 39, changing the eccentricity between the stator 352 and the rotor. When the eccentricity increases, the volume change of the sealed cavity 359 increases accordingly, and the pump's output flow rate increases. When the eccentricity decreases, the volume change of the sealed cavity 359 decreases, and the output flow rate decreases. The protection part 38 is used to determine the movement path of the transmission rod 39 and cooperates with the protrusion 354 to prevent the stator 352 from shaking. Example

[0046] like Figure 6 , Figure 7 and Figure 8 As shown, the traditional oil injection mechanism has a constant oil injection volume. However, the air compressor body 2 operates under various conditions, including high-speed operation, standard-speed operation, and low-speed operation. During high-speed operation, a fixed oil injection volume leads to insufficient cooling to keep up with the heating rate, resulting in excessively high temperatures for the air compressor body 2. Conversely, during low-speed operation, a fixed oil injection volume leads to excessively rapid cooling, directly affecting the efficiency of waste heat utilization. Therefore, this application provides an implementation method that adjusts the oil injection volume according to the spindle speed of the air compressor body 2. The transmission mechanism 9 includes a driven wheel 91, which is connected to the spindle of the air compressor body 2 via a transmission belt or chain. A turntable 92 is fixedly connected to one side of the driven wheel 91. The connecting shaft between the driven wheel 91 and the turntable 92 is rotatably connected to the protective shell 32, and a bearing is provided at the junction. A push rod 97 is inserted inside the protective shell 32, and a conical block is inserted on the other side of the turntable 92. 95. A hollow frame 93 is fixedly connected to the end of the push rod 97. A ball bearing 94 is rotatably mounted on the bottom inner side of the hollow frame 93. The ball bearing 94 rolls in contact with the edge of the conical block 95. A third spring 98 is fixedly connected between the hollow frame 93 and the protective shell 32. The third spring 98 is sleeved on the outside of the push rod 97. The other end of the push rod 97 is fixedly connected to the transmission rod 39. A movable rod 96 is radially arranged at the edge of the turntable 92. The movable rod 96 is located on the turntable 92. The inner end is provided with a trapezoidal connecting plate 911, and the inside of the conical block 95 is provided with a trapezoidal cavity 910. The trapezoidal connecting plate 911 is located inside the trapezoidal cavity 910, and the inclined surface of the trapezoidal connecting plate 911 slides in contact with the inclined surface of the conical block 95. A second spring 99 is fixedly connected between the conical block 95 and the turntable 92, and between the movable rod 96 and the turntable 92. The inside of the turntable 92 is provided with an anti-detachment cavity 912, which is located at the edge of the conical block 95.

[0047] It should be noted that the transmission ratio between the driven wheel 91 and the main shaft of the air compressor body 2 is 1:1, ensuring that the rotation speed of the turntable 92 is completely synchronized with the rotation speed of the main shaft of the air compressor body 2, thus guaranteeing the accuracy of the speed signal transmission. Deep groove ball bearings are selected to reduce energy loss during speed transmission. The outer wall of the push rod 97 is coated with a wear-resistant lubricating coating to reduce sliding friction resistance. The method of electrically controlling the oil output requires comprehensive monitoring of various data of the air compressor body 2, which is not only costly, but also the sensors are easily affected by various factors, and the reliability cannot be guaranteed. Therefore, a mechanical transmission method is used to control the oil output.

[0048] In this embodiment, the specific implementation scenario is as follows: When the main shaft of the air compressor body 2 rotates, it drives the driven wheel 91 to rotate synchronously, and the turntable 92 rotates together with the driven wheel 91, completing the transmission from the motor speed signal to the rotational motion of the turntable 92. During the rotation of the turntable 92, the conical block 95 on one side will abut against the ball 94. The conical block 95 slides in contact with the trapezoidal connecting plate 911, and the trapezoidal connecting plate 911 is connected to the radially arranged movable rod 96. During the high-speed rotation of the turntable 92, when the centrifugal force is greater than the tension of the second spring 99, the centrifugal force will force the movable rod 96 to move radially. During this process, the inclined surface of the trapezoidal connecting plate 911 will generate a pushing force on the conical block 95, causing the conical block 95 to move along the turntable 92. The axial movement of 2 causes the larger diameter portion of the conical block 95 to exert an upward thrust on the ball 94. Ultimately, this pushes the push rod 97 through the hollow frame 93, thereby increasing the eccentricity between the stator 352 and the rotor by pushing the transmission rod 39. During this process, the hollow frame 93 compresses the third spring 98. The presence of the anti-detachment cavity 912 prevents the conical block 95 from detaching from the turntable 92 and provides sufficient space for the conical block 95 to move. When the speed decreases, the rebound of the second spring 99 pulls the moving rod 96 and the conical block 95 back. At the same time, the third spring 98 rebounds the hollow frame 93, allowing the smaller diameter portion of the conical block 95 to contact the ball 94, thus reducing the eccentricity between the stator 352 and the rotor.

[0049] It should be noted that the rotation speed affects the magnitude of the centrifugal force. The magnitude of the centrifugal force is positively correlated with the moving distance of the movable rod 96. Under low-speed conditions: the spindle speed is low, resulting in a shorter extension length of the movable rod 96, a smaller amplitude of the conical block 95 being pushed out, a smaller diameter of the contact part with the ball bearing 94, and a lower height of the hollow frame 93. At this time, the eccentricity is small, and the overall oil injection volume is at a low level.

[0050] High-speed operation: As the spindle speed increases, the centrifugal force increases. The longer the extension length of the movable rod 96, the greater the amplitude of the cone block 95 being pushed out, and the larger the diameter of the contact part with the ball bearing 94. This causes the height of the hollow frame 93 to increase. The change in the height of the hollow frame 93 is then transmitted to the transmission rod 39 through the push rod 97, increasing the eccentricity. The overall oil injection volume is at a higher level. By ensuring the efficiency of waste heat recovery, the heat utilization rate is improved, thus achieving energy saving. Example

[0051] like Figure 6 and Figure 7 As shown, when the main shaft drives the driven wheel 91 and the turntable 92 to rotate at high speed, the conical block 95 and the ball 94 roll and rub against each other, and their temperature will rise significantly. After long-term use, the contact surface of the conical block 95 and the ball 94 is prone to a certain degree of deformation due to the increased temperature, which will affect the transmission accuracy. In addition, the contact friction will also generate debris, which will directly affect the normal operation of the transmission mechanism 9 and ultimately affect the stability of waste heat recovery. This application provides another implementation method. The protective shell 32 is also provided with an independent box 310. The independent box 310 is connected to the oil tank 31 by a diversion pipe 311. The oil tank 31 fills the independent box 310 with machine oil through the diversion pipe 311, and forms an oil film on the surface of the turntable 92 and the ball 94 for lubrication. A magnet block 312 is inserted into the bottom of the independent box 310.

[0052] It should be noted that the oil in the oil tank 31 enters the independent tank 310 through the diversion pipe 311, and the liquid level is the same as that in the oil tank 31. During the rotation of the turntable 92, the oil is driven to contact the outer edge of the ball 94. The oil forms a stable oil film on the surface of the conical block 95 and the ball 94, which converts the dry friction between the two into fluid friction, ensuring continuous lubrication in the contact area between the turntable 92 and the ball 94. In addition, the oil in the independent tank 310 can also be drawn out by the oil quantity regulating pump 35 to achieve closed circulation.

[0053] Working principle of the invention: When the motor drive assembly 1 is running, it drives the main shaft of the air compressor body 2. The main shaft then drives the driven wheel 91 through a transmission belt or chain at a transmission ratio of 1:1. The turntable 92, which is fixedly connected to the driven wheel 91, rotates together with it, completing the transmission from the motor speed signal to the rotational motion of the turntable 92. Different speeds of the turntable 92 correspond to different centrifugal forces. The higher the speed, the greater the centrifugal force and the longer the extension of the movable rod 96. The lower the speed, the smaller the centrifugal force and the shorter the extension of the movable rod 96. During the rotation of turntable 92, movable rod 96 moves radially under the action of centrifugal force, and pushes trapezoidal cavity 910 by trapezoidal connecting plate 911, forcing conical block 95 to move axially. The height of ball 94 is adjusted by using parts of different diameters. Since ball 94 is installed in hollow frame 93 and hollow frame 93 is fixed to push rod 97, the change in height of ball 94 will push transmission rod 39 through push rod 97. It should be noted that the independent housing 310 inside the protective shell 32 receives the oil delivered by the oil tank 31 through the diversion pipe 311. During the rotation process, the conical block 95 contacts the ball 94 to form a stable oil film to achieve lubrication. The magnetic block 312 at the bottom of the independent housing 310 adsorbs metal shavings in the oil to avoid aggravating wear. The transmission rod 39 pushes the stator 352 to move radially along the pump body, changing the eccentricity between the stator 352 and the rotor. When the eccentricity increases, the pump output flow rate increases; when the eccentricity decreases, the flow rate decreases. The first spring 357 counteracts the inertial impact of the stator 352's movement through preload. The protrusion 354 cooperates with the receiving cavity 356 to prevent the stator 352 from shaking. The protection part 38 ensures the accuracy of the transmission rod 39's movement path. The oil quantity regulating pump 35 pressurizes the oil in the oil storage tank 31 and then precisely sprays it into the compression chamber of the air compressor body 2 through the return pipe 36 and the adapter 34. Outside air is filtered by the air filter 4 and then drawn into the compression chamber to mix with the oil, thereby achieving the functions of cooling, lubrication and sealing. The high-pressure oil-air mixture is discharged into the oil-air separator 5. The oil-gas separator 5 separates the mixture into high-pressure clean air and high-temperature engine oil through centrifugal separation and filtration. The high-temperature engine oil enters the engine oil flow area through an input pipe 65, while the low-temperature circulating water enters the circulating water area through another input pipe 65. The high-temperature engine oil and the low-temperature circulating water exchange heat through the first heat exchange plate 62 and the second heat exchange plate 63. Finally, the engine oil gathers in an output pipe 66 and flows back to the oil storage tank 31, realizing engine oil circulation. The circulating water gathers in another output pipe 66 and flows into the external storage equipment. After the high-temperature engine oil and the low-temperature circulating water exchange heat, the temperature drops to 40-50℃. It is then pumped back to the oil storage tank 31 through the conveying pipe 37 and the pressurizing pump 33 to complete the closed-loop circulation of engine oil. The circulating water absorbs heat and rises to 60-80℃ before being transported to the workshop heating pipeline and the bathroom water tank to realize the first waste heat recovery. The separated high-pressure clean air still retains residual heat. It undergoes secondary heat exchange with low-temperature circulating water through another set of heat exchangers 6, further recovering the residual heat while reducing the air temperature to avoid damage to the air storage tank. The cooled high-pressure air is then transported to an external air storage tank for use by the workshop's production equipment. The circulating water that has completed the heat exchange is then incorporated into the heating or hot water supply system to achieve a second stage of waste heat recovery.

[0054] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A kind of air compressor based on waste heat recovery, including motor drive component (1), air compressor main body (2), oil-gas separator (5), heat exchanger (6), motor drive component (1), air compressor main body (2), oil-gas separator (5) and heat exchanger (6) are connected in series to form oil-gas processing and waste heat recovery passage, air compressor main body (2) is used to be discharged into oil-gas separator (5) after air compression, it is characterized in that, The air compressor main body (2) is communicated with the oil recovery and control mechanism (3) at the liquid inlet end; The oil recovery and control mechanism (3) comprises an oil quantity adjusting pump (35) installed on the oil inlet passage of the air compressor main body (2), and the oil quantity adjusting pump (35) comprises a pump body and a motor and rotor assembly (351), the rotor of the motor and rotor assembly (351) is arranged in the pump body, a stator (352) is movably arranged on the inner wall of the pump body, the rotor of the motor and rotor assembly (351) is arranged at the eccentric position of the stator (352), and an adjustable pump oil space is formed between the stator (352) and the rotor, and the pump oil space is communicated with the oil inlet passage; The adjusting end of the oil quantity adjusting pump (35) is fixedly connected with a transmission mechanism (9), the power input end of the transmission mechanism (9) is connected with the main shaft of the air compressor main body (2), the transmission mechanism (9) drives the stator (352) in the oil quantity adjusting pump (35) to move by receiving the rotation speed signal of the main shaft of the air compressor main body (2), the eccentric distance between the stator (352) and the rotor is changed, the displacement of the oil is adjusted, the driving speed of the output end of the transmission mechanism (9) is positively correlated with the change of the rotation speed of the air compressor main body (2), and the driving speed of the output end of the transmission mechanism (9) is positively correlated with the change of the volume of the pump oil space.

2. A waste heat recovery based air compressor as claimed in claim 1, wherein, The base of the motor driving assembly (1) is fixedly connected with an equipment frame (8), a positioning plate (7) is fixedly installed on one side of the equipment frame (8) and used for determining the position of the air compressor main body (2), the air inlet end of the air compressor main body (2) is fixedly communicated with an air filter (4), the oil inlet end of the oil quantity adjusting pump (35) is communicated with an oil storage tank (31), the oil storage tank (31) and the return end of the heat exchanger (6) are communicated with a conveying pipeline (37), the middle section of the conveying pipeline (37) is provided with a pressurizing pump (33), the oil outlet end of the oil quantity adjusting pump (35) is communicated with a return pipeline (36), and the end portion of the return pipeline (36) is provided with an adapter (34) which is fixedly installed at the joint of the air filter (4) and the air compressor main body (2).

3. A waste heat recovery based air compressor as claimed in claim 2, wherein, The edges of the rotor are equidistantly provided with blades (358), the rotor of the motor and rotor assembly (351) rotates at high speed during operation, the end portion of the blade (358) is in contact with the inner side wall of the stator (352) and forms a sealed cavity (359) through centrifugal force, the top of the pump body is provided with a thickened portion (355), the inside of the thickened portion (355) is provided with an accommodating cavity (356), the edge of the stator (352) is provided with a protrusion (354), the protrusion (354) is slidably arranged in the accommodating cavity (356), a compression bolt (353) is threadedly installed at the outlet of the accommodating cavity (356), and the first spring (357) is fixedly connected between the compression bolt (353) and the protrusion (354).

4. A waste heat recovery based air compressor as claimed in claim 3, wherein, The bottom of the stator (352) is fixedly connected with a transmission rod (39), the bottom of the pump body is integrally formed with a protection part (38), the transmission rod (39) is slidingly arranged in the protection part (38), and when the flow is adjusted, the transmission mechanism (9) drives the stator (352) to move along the radial direction of the pump body through the transmission rod (39), so that the size of the closed cavity (359) is adjusted to control the flow.

5. A waste heat recovery based air compressor as claimed in claim 1, wherein, The heat exchanger (6) is a double-circuit plate heat exchanger, a positioning frame (61) is fixedly installed inside the heat exchanger (6) along the length direction of the heat exchanger (6), the positioning frame (61) is a fixed rod structure, a plurality of plates are sleeved on the fixed rod, the plates are divided into first heat exchange plates (62) and second heat exchange plates (63), the first heat exchange plates (62) and the second heat exchange plates (63) are alternately and spacedly arranged, closed face plates (64) are fixedly installed at both ends of the positioning frame (61), the closed face plates (64) are attached to the outermost plates, annular sealing gaskets are arranged on the attached surfaces, sealing gaskets are arranged at the edges of adjacent first heat exchange plates (62) and second heat exchange plates (63), a machine oil flow area is formed between the first heat exchange plates (62) and the second heat exchange plates (63) on one side, and a circulating water flow area is formed between the first heat exchange plates (62) and the second heat exchange plates (63) on the other side.

6. A waste heat recovery based air compressor as claimed in claim 5 wherein, Two groups of input pipelines (65) and two groups of output pipelines (66) are fixedly installed on the closed face plates (64), a communication hole is arranged at the position corresponding to the machine oil flow area of one input pipeline (65) and one output pipeline (66), machine oil enters the corresponding machine oil flow area through the input pipeline (65) and flows out of the output pipeline (66) to circulate, a communication hole is arranged at the position corresponding to the circulating water flow area of the other input pipeline (65) and the other output pipeline (66), circulating water enters the corresponding circulating water flow area through the input pipeline (65) and flows out of the output pipeline (66) to circulate.

7. A waste heat recovery based air compressor as claimed in claim 4 wherein, The transmission mechanism (9) comprises a driven wheel (91), the driven wheel (91) is connected with the main shaft of the air compressor body (2) through a transmission belt or a chain, a turntable (92) is fixedly connected to one side of the driven wheel (91), a connecting shaft between the driven wheel (91) and the turntable (92) is rotatably connected with the protection shell (32), a bearing is arranged at the joint, a push rod (97) is inserted into the protection shell (32), an independent box body (310) is further arranged in the protection shell (32), a shunt pipeline (311) is in communication between the independent box body (310) and the oil storage tank (31), and a magnet block (312) is inserted into the bottom of the independent box body (310).

8. A waste heat recovery based air compressor as claimed in claim 7, wherein, The other side of the rotating disc (92) is inserted with a tapered block (95), the end of a push rod (97) is fixedly connected with a hollow frame (93), the bottom of the inner side of the hollow frame (93) is rotatably installed with a ball (94), the ball (94) is in rolling contact with the edge of the tapered block (95), the hollow frame (93) and the protective shell (32) are fixedly connected with a third spring (98), the third spring (98) is sleeved on the outside of the push rod (97), and the other end of the push rod (97) is fixedly connected with the transmission rod (39).

9. A waste heat recovery based air compressor as claimed in claim 8, wherein, The edge of the rotating disc (92) is provided with a movable rod (96) in the radial direction, the end of the movable rod (96) located in the rotating disc (92) is provided with a trapezoidal adapter plate (911), the inside of the tapered block (95) is provided with a trapezoidal cavity (910), the trapezoidal adapter plate (911) is located in the inside of the trapezoidal cavity (910), and the slope of the trapezoidal adapter plate (911) is in sliding contact with the slope of the tapered block (95).

10. A waste heat recovery based air compressor as claimed in claim 9, wherein, The second spring (99) is fixedly connected between the tapered block (95) and the rotating disc (92) and between the movable rod (96) and the rotating disc (92), the inside of the rotating disc (92) is provided with an anti-disengagement cavity (912), and the anti-disengagement cavity (912) is located at the edge of the tapered block (95).

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