Air compressor

Abstract

The utility model relates to the technical field of air compressors, in particular to an air compressor, a liquid inlet connector and a liquid outlet connector which are communicated with a cooling channel are arranged on a liquid cooling variable frequency motor, a liquid cooling variable frequency module is added, the liquid cooling variable frequency module comprises a first cooler, a cooling fan, a water tank, a circulating pump and a frequency converter, and the output frequency of the frequency converter is adjusted by the frequency converter. By changing the rotating speed of the motor in the circulating pump, the flow and the pressure of the circulating pump are controlled, so that the frequency conversion control of the liquid-cooled variable frequency motor can be adapted, the heat dissipation of the liquid-cooled variable frequency motor is more reasonable, and the coil temperature of the liquid-cooled variable frequency motor can be effectively maintained below 100 DEG C; and the liquid-cooled variable frequency motor is prevented from being damaged due to long-term high-temperature operation of the liquid-cooled variable frequency motor caused by poor cooling effect.

Description

Technical Field

[0001] The utility model relates to the technical field of air compressors, and particularly relates to an air compressor. Background Art

[0002] An air compressor, simply referred to as an air compressor, works by using an electric motor to drive the rotor of the compressor main unit to rotate, sucking in air and gradually compressing it, and finally releasing the compressed air. Commonly used air compressors on the market include piston air compressors, screw air compressors, centrifugal compressors, and sliding vane air compressors, etc.

[0003] An air compressor is a device that needs to dissipate heat in a timely manner. Since it generates a large amount of heat during long-term operation, if the heat is not dissipated in a timely manner, it will cause damage to the device. Usually, water-cooled heat dissipation or fan heat dissipation methods are used to dissipate heat from the air compressor, keeping the temperature of the machine stable, improving the stability of the machine, and at the same time reducing the noise of the machine.

[0004] For air-cooled heat dissipation devices, fan heat dissipation is adopted. Due to the low power of the fan, in order to ensure the heat dissipation effect, multiple fans are usually combined for heat dissipation. Such structures can be referred to as a high-power air compressor disclosed in Chinese Patent Publication No. CN207647780U and an air-cooled screw air compressor disclosed in Chinese Patent Publication No. CN210889329U. Using multiple fans for heat dissipation has problems of high noise and high energy consumption.

[0005] In order to solve the problems of noise and energy consumption, air compressors with water-cooled heat dissipation devices have emerged. For example, the internally water-cooled multi-stage compression oil-free scroll air compressor disclosed in Chinese Patent Publication No. CN109555686A has a water-containing cavity formed in the motor housing of the double-output shaft motor, and a cooling water inlet interface and a cooling water outlet interface connected to the water-containing cavity inside the motor housing. Cold water is introduced into the water-containing cavity to achieve heat dissipation of the double-output shaft motor.

[0006] Traditional water-cooled air compressors cannot adjust the flow rate and pressure of the coolant according to the operating frequency of the variable-frequency motor. When the frequency of the variable-frequency motor is low, the energy consumption of the water-cooling system is high. When the frequency of the variable-frequency motor is high, the water-cooling system cannot meet the heat dissipation requirements.

[0007] Therefore, the existing technology still needs to be improved and developed. Summary of the Utility Model

[0008] In view of the above deficiencies of the existing technology, the purpose of the present utility model is to provide an air compressor to solve the problem that the existing water-cooled air compressor cannot be adapted to the variable-frequency use of the variable-frequency motor.

[0009] An air compressor includes:

[0010] A chassis;

[0011] An air compression module is disposed inside the chassis and includes a liquid-cooled variable-frequency motor, a main engine, an oil-gas separator, a cooler assembly, and a centrifugal fan. A cooling channel is provided inside the liquid-cooled variable-frequency motor, and a liquid inlet joint and a liquid outlet joint communicating with the cooling channel are provided on the liquid-cooled variable-frequency motor;

[0012] A liquid-cooled variable-frequency module is disposed inside the chassis and includes a first cooler connected to the liquid outlet joint, a cooling fan for dissipating heat from the first cooler, a water tank connected to the liquid discharge port of the first cooler, a circulation pump connected to the liquid discharge port of the water tank, and a frequency converter for controlling the flow rate and pressure of the circulation pump. The liquid discharge port of the circulation pump communicates with the liquid inlet joint.

[0013] Specifically, the chassis includes a front door panel. A control panel is provided on the front door panel, and a distribution box is fixed to the back of the front door panel. The frequency converter is fixed inside the distribution box, and a ventilation port cover is provided on the top of the distribution box.

[0014] Specifically, the air compressor includes a filtration module. The filtration module includes an air filter communicating with the air inlet of the main engine and a filtration structure connected to the air inlet of the air filter. The chassis includes a left cover plate. The filtration structure is disposed on the left cover plate. The filtration structure includes a housing having an air passage communicating with the air inlet of the air filter. A plurality of vertically offset partitions are provided inside the air passage, and a first filter screen for communicating the air passage with the outside is further provided at one end of the housing.

[0015] Specifically, an intake valve is provided between the main engine and the air filter.

[0016] Specifically, a second filter screen is provided on the left cover plate, and a dust collection box with an open upper end is provided on one side of the second filter screen. The dust collection box is located on one side of the liquid-cooled variable-frequency module.

[0017] Specifically, the oil-gas separator is provided with an air outlet interface at the upper part and an oil outlet interface at the lower part. The cooler assembly includes a second cooler and a third cooler. The air outlet interface is connected to the input end of the second cooler. A gas output joint is connected to the output end of the second cooler. The oil outlet interface is connected to the input end of the third cooler. An oil filter is connected to the output end of the third cooler. A first pipeline is connected to the output end of the oil filter. The first pipeline is connected with a three-way valve. Two outlets of the three-way valve are respectively connected with a second pipeline and a third pipeline. The second pipeline communicates with the inner cavity of the main engine, and the third pipeline communicates with the bearing installation position of the main engine.

[0018] Specifically, the third pipeline also passes through the air passage.

[0019] Specifically, a fourth pipeline is connected to the air outlet end of the host. An annular air inlet passage is provided in the oil-gas separator. The fourth pipeline communicates with the air inlet passage and forms a tangential angle with the air inlet passage.

[0020] Specifically, a wind channel is provided above the centrifugal fan, and a third filter screen is provided at the top of the wind channel.

[0021] Specifically, the chassis includes a right cover plate, and a fourth filter screen is provided on the right cover plate. The fourth filter screen is located on one side of the cooler assembly.

[0022] Advantages of the present utility model:

[0023] For the air compressor of the present utility model, a liquid inlet joint and a liquid outlet joint communicating with the cooling channel are provided on the liquid-cooled variable-frequency motor, and a liquid-cooled variable-frequency module is added. The liquid-cooled variable-frequency module includes a first cooler, a cooling fan, a water tank, a circulation pump, and a frequency converter. The frequency converter adjusts its output frequency to change the motor speed in the circulation pump, thereby controlling the flow rate and pressure of the circulation pump, so as to be adaptable to the variable-frequency control of the liquid-cooled variable-frequency motor, making the heat dissipation of the liquid-cooled variable-frequency motor more reasonable, and effectively maintaining the coil temperature of the liquid-cooled variable-frequency motor below 100°C, avoiding damage to the liquid-cooled variable-frequency motor caused by long-term high-temperature operation due to poor cooling effect. Description of the Drawings

[0024] Figure 1 Is a three-dimensional view of the air compressor of the present application Figure 1 ;

[0025] Figure 2 Is a three-dimensional view of the air compressor of the present application Figure 2 ;

[0026] Figure 3 Is the internal structure diagram of the air compressor of the present application;

[0027] Figure 4 Is the three-dimensional view of the air compression module and the liquid-cooled variable-frequency module of the present application;

[0028] Figure 5 Is the three-dimensional view of the liquid-cooled variable-frequency module of the present application;

[0029] Figure 6 Is the schematic diagram of the liquid flow direction of the liquid-cooled variable-frequency module of the present application;

[0030] Figure 7 Is the three-dimensional view of the air compression module of the present application;

[0031] Figure 8 Is the structural schematic diagram of the filter module of the present application;

[0032] Figure 9 The right view of the oil-gas separator of the present application;

[0033] Figure 10 is Figure 9 the sectional view of the A-A plane in

[0034] Figure 11 the perspective view of the second filter screen and the dust collection box of the present application.

[0035] The reference numerals are: chassis 10, air compression module 20, liquid-cooled variable-frequency motor 21, main unit 22, oil-gas separator 23, cooler assembly 24, centrifugal fan 25, liquid inlet joint 211, liquid outlet joint 212, liquid-cooled variable-frequency module 30, first cooler 31, cooling fan 32, water tank 33, circulation pump 34, frequency converter 35, front door panel 11, control panel 12, distribution box 13, ventilation opening cover plate 14, filter module 40, air filter 41, filtering structure 42, left cover plate 15, housing 421, air passage 4211, partition 422, first filter screen 423, intake valve 50, second filter screen 16, dust collection box 17, gas outlet interface 231, oil outlet interface 232, second cooler 241, third cooler 242, gas output joint 60, oil filter 71, first pipeline 72, three-way valve 73, second pipeline 74, third pipeline 75, fourth pipeline 76, intake passage 233, air duct 251, third filter screen 252, right cover plate 18, fourth filter screen 19. Detailed implementation manners

[0036] The present utility model provides an air compressor. To make the purpose, technical solutions and effects of the present utility model clearer and more definite, the following takes examples with reference to the attached drawings to further elaborate on the present utility model in detail. It should be understood that the specific examples described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0037] In the description of the present utility model, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the attached drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model.

[0038] As Figures 1 to 11 , this embodiment discloses an air compressor, including:

[0039] chassis 10;

[0040] An air compression module 20 is provided inside the chassis 10 and includes a liquid-cooled variable-frequency motor 21, a main unit 22, an oil-gas separator 23, a cooler assembly 24, and a centrifugal fan 25. A cooling channel is provided inside the liquid-cooled variable-frequency motor 21, and a liquid inlet joint 211 and a liquid outlet joint 212 communicating with the cooling channel are provided on the liquid-cooled variable-frequency motor 21.

[0041] A liquid-cooled variable-frequency module 30 is provided inside the chassis 10 and includes a first cooler 31 connected to the liquid outlet joint 212, a cooling fan 32 for dissipating heat from the first cooler 31, a water tank 33 connected to the drain port of the first cooler 31, a circulation pump 34 connected to the drain port of the water tank 33, and a frequency converter 35 for controlling the flow rate and pressure of the circulation pump 34. The drain port of the circulation pump 34 communicates with the liquid inlet joint 211.

[0042] The air compressor in this embodiment can be a single-screw air compressor. During operation, gas enters the compression chamber of the main unit 22, and lubricating oil is introduced into the compression chamber. The liquid-cooled variable-frequency motor 21 drives two rotors with spiral gears inside the main unit 22 to mesh with each other, thereby compressing the gas and discharging a high-temperature and high-pressure oil-gas mixture, which is transported to the oil-gas separator 23 through a pipeline. Oil-gas separation is carried out in the oil-gas separator 23. The separated high-temperature oil body sinks to the bottom of the oil-gas separator 23 and is transported to the cooler assembly 24 through a pipeline, and then flows back to the compression chamber of the main unit 22 after cooling; while the separated high-temperature gas automatically floats and is transported to the cooler assembly 24 through a pipeline, and the compressed gas is output after cooling.

[0043] Since the application scenarios of air compressors are different and the required power consumption is also different, for this reason, a liquid-cooled variable-frequency motor 21 is adopted in this embodiment. A cooling channel is provided inside the liquid-cooled variable-frequency motor 21, and a liquid inlet joint 211 and a liquid outlet joint 212 communicating with the cooling channel are provided on the liquid-cooled variable-frequency motor 21. Moreover, a liquid-cooled variable-frequency module 30 is added. The liquid-cooled variable-frequency module 30 includes a first cooler 31, a cooling fan 32, a water tank 33, a circulation pump 34, and a frequency converter 35. The frequency converter 35 adjusts its output frequency to change the motor speed inside the circulation pump 34, thereby controlling the flow rate and pressure of the circulation pump 34, so as to be able to adapt to the variable-frequency control of the liquid-cooled variable-frequency motor 21, making the heat dissipation of the liquid-cooled variable-frequency motor 21 more reasonable, and effectively maintaining the coil temperature of the liquid-cooled variable-frequency motor 21 below 100°C, avoiding damage to the liquid-cooled variable-frequency motor 21 caused by long-term high-temperature operation due to poor cooling effect.

[0044] Further, please refer to Figure 1 and Figure 3The chassis 10 includes a front door panel 11, on which a control panel 12 is provided, a distribution box 13 is fixed to the back of the front door panel 11, and the inverter 35 is fixed in the distribution box 13. A vent cover 14 is provided on the top of the distribution box 13. When the cooling fan 32 is working, part of the gas flows along the vent cover 14 and the distribution box 13, and takes away the heat generated by the inverter 35 in the distribution box 13, so as to prevent the inverter 35 from overheating.

[0045] For further information, please refer to Figure 3 and Figure 8 The air compressor includes a filter module 40, which includes an air filter 41 connected to the air inlet of the host 22 and a filter structure 42 connected to the air inlet of the air filter 41. The chassis 10 includes a left cover plate 15, and the filter structure 42 is arranged on the left cover plate 15. The filter structure 42 includes a shell 421 with an air channel 4211, and the air channel 4211 is connected to the air inlet of the air filter 41. A plurality of partitions 422 offset up and down are arranged in the air channel 4211. By arranging the partitions 422, the air channel 4211 forms a maze-like structure. When the gas passes through the air channel 4211, the gas is reflected and rotated multiple times, which increases the energy of the gas, thereby improving the efficiency of the compressor. One end of the shell 421 is also provided with a first filter screen 423 for connecting the air channel 4211 with the outside world to prevent dust, insects, and cotton wool from entering the air filter 41, reduce the frequency of cleaning or replacing the air filter 41, and effectively prevent the filter holes of the air filter 41 from being blocked.

[0046] Please refer to Figure 7 An air inlet valve 50 is provided between the main unit 22 and the air filter 41 to control the inlet and outlet of air and prevent dust and impurities from entering the air compressor during operation to avoid affecting the normal operation of the equipment.

[0047] Please refer to Figure 11 The left cover 15 is provided with a second filter 16 to prevent large particles of dust, insects, and cotton wool from entering the air filter 41. A dust box 17 with an open upper end is provided on one side of the second filter 16. The dust box 17 is located on one side of the liquid-cooled frequency conversion module 30. When the gas enters through the second filter 16, some small particles of dust in the gas will directly hit the inner side of the dust box 17 and fall to the inner bottom of the dust box 17 for collection.

[0048] Please refer to Figure 7, the oil-gas separator 23 is provided with an air outlet interface 231 located above and an oil outlet interface 232 located below. The cooler assembly 24 includes a second cooler 241 and a third cooler 242. The air outlet interface 231 is connected to the input end of the second cooler 241, and the output end of the second cooler 241 is connected with a gas output joint 60. After the compressed gas is cooled by the second cooler 241, it is output from the gas output joint 60.

[0049] The oil outlet interface 232 is connected to the input end of the third cooler 242, and the output end of the third cooler 242 is connected with an oil filter 71. The lubricating oil cooled by the third cooler 242 first passes through the oil filter 71 for filtering to remove impurities. The output end of the oil filter 71 is connected with a first pipeline 72, and the first pipeline 72 is connected with a three-way valve 73. The two outlets of the three-way valve 73 are respectively connected with a second pipeline 74 and a third pipeline 75. The second pipeline 74 is communicated with the inner cavity of the main engine 22, and most of the filtered lubricating oil directly flows back to the inner cavity of the main engine 22 through the second pipeline 74.

[0050] Furthermore, in this embodiment, the third pipeline 75 is also communicated with the bearing installation position of the main engine 22. Through the control of the three-way valve 73, part of the lubricating oil can supply oil to the bearings in the main engine 22, improving the lubricity of the bearings.

[0051] In addition, as Figure 8 shown, the third pipeline 75 of this embodiment also passes through the air passage 4211, making full use of the air flow in the air passage 4211 to cool the lubricating oil conveyed by the third pipeline 75, with a clever structure.

[0052] Please refer to Figure 9 and Figure 10 , the air outlet end of the main engine 22 is connected with a fourth pipeline 76. An annular air inlet passage 233 is provided in the oil-gas separator 23. The fourth pipeline 76 is communicated with the air inlet passage 233 and forms a tangential angle with the air inlet passage 233, avoiding the high-temperature and high-pressure oil-gas mixture discharged from the main engine 22 directly hitting the side wall of the air inlet passage 233, resulting in the oil-gas mixture flowing directly upward, thus affecting the subsequent oil-gas separation effect. The tangential structure design can more reasonably guide the oil-gas mixture to flow along the air inlet passage 233, ensuring the oil-gas separation effect.

[0053] Please refer to Figure 2 and Figure 3 , a wind channel 251 is provided above the centrifugal fan 25 for guiding the air flow to be discharged upward. A third filter screen 252 is provided at the top of the wind channel 251, and the third filter screen 252 can prevent sundries from falling into the wind channel 251.

[0054] Please refer to Figure 1, the chassis 10 includes a right cover plate 18, and the right cover plate 18 is provided with a fourth filter screen 19. The fourth filter screen 19 is located on one side of the cooler assembly 24. By providing the fourth filter screen 19, the air conductivity on the right side of the chassis 10 is good, and the cooler assembly 24 can be placed on the right side inside the chassis 10, which can improve the heat dissipation effect of the cooler assembly 24.

[0055] The above has specifically described the preferred embodiments of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art can also make various equivalent variations or substitutions without departing from the spirit of the present invention, and these equivalent variations or substitutions are all included within the scope defined by the claims of the present invention.

Claims

1. An air compressor, characterized in that: include: Chassis (10); An air compression module (20) is arranged in the chassis (10), comprising a liquid-cooled variable frequency motor (21), a main engine (22), an oil-gas separator (23), a cooler assembly (24), and a centrifugal fan (25); a cooling channel is arranged in the liquid-cooled variable frequency motor (21); and a liquid inlet joint (211) and a liquid outlet joint (212) which are in communication with the cooling channel are arranged on the liquid-cooled variable frequency motor (21); A liquid-cooled frequency conversion module (30) is disposed in the chassis (10), comprising a first cooler (31) connected to the liquid outlet connector (212), a cooling fan (32) for dissipating heat from the first cooler (31), a water tank (33) connected to the liquid discharge port of the first cooler (31), a circulating pump (34) connected to the liquid discharge port of the water tank (33), and a frequency converter (35) for controlling the flow rate and pressure of the circulating pump (34); the liquid discharge port of the circulating pump (34) is connected to the liquid inlet connector (211).

2. An air compressor according to claim 1, characterized in that: The chassis (10) comprises a front door panel (11), a control panel (12) is provided on the front door panel (11), a distribution box (13) is fixed on the back of the front door panel (11), the frequency converter (35) is fixed in the distribution box (13), and a ventilation cover plate (14) is provided on the top of the distribution box (13).

3. An air compressor according to claim 1, characterized in that: The air compressor comprises a filter module (40), the filter module (40) comprises an air filter (41) connected to an air inlet of the main unit (22), and a filter structure (42) connected to the air inlet of the air filter (41); the chassis (10) comprises a left cover plate (15), the filter structure (42) is arranged on the left cover plate (15), the filter structure (42) comprises a shell (421) having an air passage (4211), the air passage (4211) is connected to the air inlet of the air filter (41), a plurality of partitions (422) staggered up and down are arranged in the air passage (4211), and a first filter screen (423) for connecting the air passage (4211) with the outside is also arranged at one end of the shell (421).

4. An air compressor according to claim 3, characterized in that: An air intake valve (50) is provided between the main unit (22) and the air filter (41).

5. An air compressor according to claim 3, characterized in that: The left cover plate (15) is provided with a second filter screen (16), and a dust collecting box (17) with an open upper end is provided on one side of the second filter screen (16), and the dust collecting box (17) is located on one side of the liquid-cooled frequency conversion module (30).

6. An air compressor according to claim 3, characterized in that: The oil-gas separator (23) is provided with an air outlet interface (231) located at the top and an oil outlet interface (232) located at the bottom. The cooler assembly (24) comprises a second cooler (241) and a third cooler (242). The air outlet interface (231) is connected to the input end of the second cooler (241). The output end of the second cooler (241) is connected to a gas output connector (60). The oil outlet interface (232) is connected to the input end of the third cooler (242). The output end of the third cooler (242) is connected to an oil filter (71). The output end of the oil filter (71) is connected to a first pipeline (72). The first pipeline (72) is connected to a three-way valve (73). Two outlets of the three-way valve (73) are respectively connected to a second pipeline (74) and a third pipeline (75). The second pipeline (74) is in communication with the inner cavity of the main engine (22). The third pipeline (75) is in communication with a bearing mounting position of the main engine (22).

7. An air compressor according to claim 6, characterized in that: The third pipe (75) also passes through the air channel (4211).

8. An air compressor according to claim 1, characterized in that: The air outlet end of the main engine (22) is connected to a fourth pipeline (76), an annular air inlet passage (233) is provided in the oil-gas separator (23), and the fourth pipeline (76) is in communication with the air inlet passage (233) and forms a tangent angle with the air inlet passage (233).

9. An air compressor according to claim 1, characterized in that: An air duct (251) is provided above the centrifugal fan (25), and a third filter screen (252) is provided at the top of the air duct (251).

10. An air compressor according to claim 1, characterized in that: The chassis (10) comprises a right cover plate (18), the right cover plate (18) is provided with a fourth filter screen (19), and the fourth filter screen (19) is located on one side of the cooler assembly (24).

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