Screw air compressor

Abstract

The utility model relates to the technical field of air compressors, in particular to a screw air compressor which comprises a machine case, a control device, an air compressor body, a centrifugal fan, a liquid cooling motor and a liquid cooling system, and the air compressor body, the centrifugal fan, the liquid cooling motor and the liquid cooling system are arranged in the machine case. The air compressor body comprises an air filter, a screw compression main machine, an oil-gas separator, an oil filter and a cooling device, the oil filter communicates with the screw compression main machine and the oil-gas separator, and the screw compression main machine is connected with the liquid cooling motor through a coupler; a first air inlet part communicated with the air inlet end of the air filter and a second air inlet part communicated with the centrifugal fan are arranged on the case. According to the screw air compressor, the overall energy consumption of the screw air compressor is reduced, the compression efficiency is improved, the situation that the viscosity of lubricating oil in all the components is reduced due to high temperature is effectively avoided, and the service life of all the components of the screw air compressor is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of air compressors, in particular to a screw air compressor. Background Art

[0002] An air compressor is a machine used to compress gas to increase gas pressure or transport gas. Air compressors are widely used, almost in every field such as industry and agriculture, national defense, science and technology, and civil use.

[0003] There are many types of air compressors, including screw air compressors (screw air compressors are divided into twin-screw air compressors and single-screw air compressors), piston air compressors, centrifugal compressors, and scroll air compressors. Among them, screw air compressors are the most widely used air compressors. Since the compression host and drive motor inside the chassis will generate a lot of heat when working, the air temperature inside the chassis will rise. High temperature will easily reduce the lubrication effect of each component and increase the wear of the components, which will not only affect the service life of the components, but also affect the compression efficiency of the air compressor.

[0004] It can be seen that the existing technology still needs to be improved and enhanced. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a screw air compressor to solve the problems of poor heat dissipation and low compression efficiency of the existing air compressors.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A screw air compressor comprises a chassis, a control device arranged on the chassis, an air compressor body arranged in the chassis and electrically connected to the control device, a centrifugal fan, a liquid-cooled motor and a liquid cooling system, wherein the liquid cooling system is connected to the liquid-cooled motor, the air compressor body comprises an air filter, a screw compressor main unit, an oil-gas separator, an oil filter and a cooling device, the air filter, the screw compressor main unit, the oil-gas separator and the cooling device are connected in sequence, the oil filter is connected to the screw compressor main unit and the oil-gas separator respectively, the screw compressor main unit is connected to the liquid-cooled motor through a coupling, and the chassis is provided with a first air inlet portion connected to the air inlet end of the air filter, and a second air inlet portion connected to the centrifugal fan.

[0008] In a screw air compressor as described above, the liquid cooling system includes a liquid-cooled cooler, a cooling fan, a water tank, a circulating pump and a liquid-cooled frequency converter. The liquid-cooled cooler, the water tank, the circulating pump and the liquid-cooled frequency converter are connected in sequence, the liquid-cooled motor is connected to the water inlet of the liquid-cooled cooler, the water outlet of the liquid-cooled frequency converter is connected to the liquid-cooled motor, and the cooling fan is arranged adjacent to the liquid-cooled cooler.

[0009] In a screw air compressor as described above, the centrifugal fan is placed horizontally in the chassis, and the second air intake portion includes a first opening arranged above the chassis, a second opening arranged on a side of the chassis corresponding to the air intake end of the centrifugal fan, a partition net covering the first opening, and a filter net arranged on the second opening, and a cavity is formed between the air intake end of the centrifugal fan and the filter net, and the cooling device is arranged in the cavity.

[0010] In the screw air compressor as described above, the cooling device includes an air cooler connected to the air outlet end of the oil-gas separator, and an oil cooler connected to the oil-gas separator and the oil filter respectively.

[0011] In a screw air compressor as described above, the first air intake part includes an air inlet arranged on the chassis, a cover body fixed to the inner side of the chassis corresponding to the air inlet, a through hole arranged on the cover body, and a wind-blocking structure and a precooling device arranged in the cover body, the air inlet end of the air filter is connected to the through hole, and the through hole is staggered with the air inlet.

[0012] In the screw air compressor as described above, the wind-blocking structure includes two wind shields, which are spaced apart along the width direction of the cover body, and are respectively connected to the upper and lower ends of the cover body, and the two wind shields form a curved air duct in the cover body.

[0013] In the screw air compressor as described above, the air compressor body further comprises a three-way valve connecting the screw compressor main unit and the oil filter, and the precooling device comprises cooling pipes respectively connected to the three-way valve and the screw compressor main unit.

[0014] In a screw air compressor as described above, the oil-gas separator includes a tank body, a refueling port, an oil drain port, an air inlet pipe, an air outlet pipe, an inner tube, a limiting ring and a clamping groove, the refueling port, the oil drain port, the air inlet pipe and the air outlet pipe are respectively arranged on the tank body, the inner tube is detachably installed in the air inlet pipe, the clamping groove is arranged on one end of the air inlet pipe opening, the limiting ring is placed on the clamping groove and fixed to the clamping groove by screws, and the limiting ring abuts against one end of the inner tube close to the air inlet pipe opening.

[0015] The screw air compressor as described above further includes a housing sleeved on the outside of the coupling, a bracket mounted on the housing, and a vibration sensor disposed on the bracket.

[0016] Beneficial effects:

[0017] The utility model discloses a screw air compressor, comprising a chassis, a control device, an air compressor body, a centrifugal fan, a liquid-cooled motor and a liquid cooling system, wherein the air compressor body comprises an air filter, a screw compressor main unit, an oil-gas separator, an oil filter and a cooling device, which is controlled by the control device, the liquid-cooled motor drives the screw compressor main unit to work through the coupling, the liquid cooling system is connected to the liquid-cooled motor to liquid-cool the liquid-cooled motor, and external air passes through the air filter, the screw compressor main unit, the oil-gas separator and the cooling device in sequence. The centrifugal fan is used to cool and compress the air to obtain compressed gas. At the same time, the centrifugal fan works to form a high-speed airflow around the screw air compressor. By utilizing the Bernoulli effect, the greater the flow rate, the smaller the pressure, so that the outside air moves toward the screw air compressor to assist the air intake of the air compressor body. In addition, the air flow around the centrifugal fan accelerates heat exchange to cool the inside of the chassis. The screw air compressor disclosed in the present application reduces the overall energy consumption of the screw air compressor, improves the compression efficiency, and effectively avoids the decrease in the viscosity of the lubricating oil in each component due to high temperature, thereby extending the service life of each component of the screw air compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of the screw air compressor provided by the utility model;

[0019] Figure 2 An exploded diagram of the screw air compressor provided by the utility model;

[0020] Figure 3 An exploded view of the screw air compressor provided by the utility model from another angle;

[0021] Figure 4 A schematic diagram of the internal structure of the screw air compressor provided by the utility model;

[0022] Figure 5 A schematic diagram of the internal structure of the screw air compressor provided by the utility model from another angle;

[0023] Figure 6 This is an exploded view of the oil-gas separator provided by the utility model.

[0024] Reference numerals: 1, chassis; 11, first air inlet; 12, second air inlet; 111, air inlet; 112, cover; 113, through hole; 114, wind blocking structure; 115, precooling device; 121, first opening; 122, second opening; 123, partition net; 124, filter net; 125, cavity; 2, air compressor body; 21, air filter; 22, screw compressor host; 23, oil-gas separator; 24, oil filter; 25, cooling device; 231, tank body; 23 2. Oil filling port; 233. Oil drain port; 234. Air inlet pipe; 235. Air outlet pipe; 236. Inner pipe; 237. Limiting ring; 238. Clamping groove; 251. Air cooler; 252. Oil cooler; 3. Centrifugal fan; 4. Liquid-cooled motor; 5. Liquid cooling device; 51. Liquid-cooled cooler; 52. Cooling fan; 53. Water tank; 54. Circulation pump; 55. Liquid-cooled inverter; 6. Control device; 7. Coupling; 71. Housing; 8. Three-way valve; 9. Bracket; 10. Vibration sensor. DETAILED DESCRIPTION

[0025] The utility model provides a screw air compressor. In order to make the purpose, technical solution and effect of the utility model clearer and more specific, the utility model is further described in detail below with reference to the accompanying drawings and embodiments.

[0026] In the description of the present invention, it should be understood that the terms "top", "bottom", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and should not be understood as a limitation on the present invention; in addition, the terms "installation", "connection", etc. should be understood in a broad sense, and ordinary technicians in this field can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0027] like Figure 1-6 As shown, an embodiment of the present application proposes a screw air compressor, comprising a chassis 1, a control device 6 arranged on the chassis 1, and an air compressor body 2, a centrifugal fan 3, a liquid-cooled motor 4 and a liquid cooling system 5 arranged in the chassis 1 and electrically connected to the control device 6, wherein the liquid cooling system 5 is connected to the liquid-cooled motor 4, and the air compressor body 2 comprises an air filter 21, a screw compressor main unit 22, an oil-gas separator 23, an oil filter 24 and a cooling device 25, wherein the air filter 21, the screw compressor main unit 22, the oil-gas separator 23 and the cooling device 25 are connected in sequence, and the oil filter 24 is connected to the screw compressor main unit 22 and the oil-gas separator 23 respectively, and the screw compressor main unit 22 is connected to the liquid-cooled motor 4 through a coupling 7, and the chassis 1 is provided with a first air inlet portion 11 connected to the air inlet end of the air filter 21, and a second air inlet portion 12 connected to the centrifugal fan 3.

[0028] The utility model discloses a screw air compressor, comprising a chassis 1, a control device 6, an air compressor body 2, a centrifugal fan 3, a liquid-cooling motor 45 and a liquid cooling system 5, wherein the air compressor body 2 comprises an air filter 21, a screw compressor host 22, an oil-gas separator 23, an oil filter 24 and a cooling device 25, which are controlled by the control device 6, the liquid-cooling motor 45 drives the screw compressor host 22 to work through the coupling 7, the liquid cooling system 5 is connected to the liquid-cooling motor 45 to liquid-cool the liquid-cooling motor 45, and the external air passes through the air filter 21, the screw compressor host 22, the liquid cooling system 5 and the liquid cooling system 5 in sequence. The oil-gas separator 23 and the cooling device 25 cool and compress to obtain compressed gas, and at the same time, the centrifugal fan 3 works to form a high-speed airflow around the screw air compressor. By utilizing the Bernoulli effect, the greater the flow rate, the smaller the pressure, so that the outside air moves toward the screw air compressor, assisting the air intake of the air compressor body 2, and the air flow around the centrifugal fan 3 accelerates heat exchange to cool the inside of the chassis 1. The screw air compressor disclosed in the present application reduces the overall energy consumption of the screw air compressor, improves the compression efficiency, and effectively avoids the decrease in the viscosity of the lubricating oil in each component due to high temperature, thereby extending the service life of each component of the screw air compressor.

[0029] Furthermore, the control device 6 includes a control host and a display screen electrically connected to the control host.

[0030] The liquid cooling system 5 includes a liquid cooling cooler 51, a cooling fan 52, a water tank 53, a circulating pump 54 and a liquid cooling inverter 55. The liquid cooling cooler 51, the water tank 53, the circulating pump 54 and the liquid cooling inverter 55 are connected in sequence. The liquid cooling motor 4 is connected to the water inlet end of the liquid cooling cooler 51, and the water outlet end of the liquid cooling inverter 55 is connected to the liquid cooling motor 4. The cooling fan 52 is arranged adjacent to the liquid cooling cooler 51. The antifreeze in the water tank 53 is pumped to the liquid cooling inverter 55, the liquid cooling motor 4 and the liquid cooling cooler 51 in sequence through the circulating pump 54. The antifreeze passes through the liquid cooling motor 4 to cool the inside thereof. The liquid cooling cooler 51 and the cooling fan 52 cool the internal antifreeze to exchange heat so that the liquid cooling motor 4 is in the best working state and reduces energy consumption.

[0031] The centrifugal fan 3 is placed horizontally in the chassis 1, and the second air inlet portion 12 includes a first opening 121 arranged above the chassis 1, a second opening 122 arranged on one side of the chassis 1 corresponding to the air inlet end of the centrifugal fan 3, a partition 123 covering the first opening 121, and a filter 124 arranged on the second opening 122, and a cavity 125 is formed between the air inlet end of the centrifugal fan 3 and the filter 124, and the cooling device 25 is arranged in the cavity 125. The filter 124 is provided to prevent dust, insects, etc. from entering the inside of the centrifugal fan 3 and avoid sticking to the impeller of the centrifugal fan 3 to increase energy consumption, and the cooling device 25 is installed at the air inlet end of the centrifugal fan 3, and uses air flow to achieve a cooling effect, without the need to add other cooling structures or devices, thereby improving energy utilization.

[0032] The cooling device 25 includes an air cooler 251 connected to the air outlet end of the oil-gas separator 23, and an oil cooler 252 connected to the oil-gas separator 23 and the oil filter 24 respectively. The air cooling of the centrifugal fan 3 is used to cool and exchange heat for the compressed gas and the cooling oil in the air compressor body 2 at the same time, thereby improving energy utilization.

[0033] The first air inlet portion 11 includes an air inlet 111 provided on the chassis 1, a cover 112 fixed to the inner side of the chassis 1 corresponding to the air inlet 111, a through hole 113 provided on the cover 112, and a wind blocking structure 114 and a precooling device 115 provided in the cover 112. The air inlet end of the air filter 21 is connected to the through hole 113, and the through hole 113 is staggered with the air inlet 111. The wind blocking structure 114 includes two wind shields, which are arranged along the cover. The body 112 is separated in the width direction, and the two wind shields are respectively connected to the upper and lower ends of the cover body 112, and the two wind shields form a bent air duct in the cover body 112. The outside air enters from the air inlet 111, passes through the bent air duct and enters the air filter 21 through the through hole 113. The bent air duct reduces the flow rate of the air, so that the air is fully in contact with the pre-cooling device 115, reduces the water content and air temperature of the air entering the air compressor body 2, and improves the compression efficiency of the screw air compressor.

[0034] Furthermore, the air compressor body 2 also includes a three-way valve 8 connecting the screw compressor main unit 22 and the oil filter 24, and the precooling device 115 includes cooling pipes respectively connected to the three-way valve 8 and the screw compressor main unit 22, and precooling is performed using the cooling oil of the air compressor body 2 to improve energy utilization.

[0035] The oil-gas separator 23 includes a tank body 231, a refueling port 232, an oil discharge port 233, an air inlet pipe 234, an air outlet pipe 235, an inner tube 236, a limiting ring 237 and a clamping groove 238. The refueling port 232, the oil discharge port 233, the air inlet pipe 234 and the air outlet pipe 235 are respectively arranged on the tank body 231, the inner tube 236 is detachably installed in the air inlet pipe 234, and the clamping groove 238 is arranged on the inner tube 236. On the open end of the air intake pipe 234, the limiting ring 237 is placed on the clamping groove 238 and fixed to the clamping groove 238 by screws, and the limiting ring 237 abuts against the end of the inner tube 236 close to the opening of the air intake pipe 234. The inner tube 236 is clamped and fixed by the limiting ring 237 to achieve the diameter change of the air intake pipe 234, adapt to air pipes of different calibers, and be suitable for air compressors of various powers.

[0036] Furthermore, the oil-gas separator 23 is also provided with a safety valve, a pressure sensor and a temperature sensor extending into the tank body 231 and electrically connected to the control device 6, and pressure sensors are provided at both ends of the oil filter 24 to ensure the normal operation of the air compressor body 2.

[0037] Furthermore, the centrifugal fan 2 includes a housing, an impeller mounted on the housing, and a variable frequency motor mounted on the housing and connected to the impeller, so as to reduce noise during operation of the machine.

[0038] The screw air compressor also includes a shell 71 sleeved on the outside of the coupling 7, a bracket 9 installed on the shell 71, and a vibration sensor 10 arranged on the bracket 9. By detecting the vibration amplitude of the shell 71, it is determined whether the connection between the screw compression main unit 22 and the liquid-cooled motor 4 is stable, thereby ensuring the normal operation of the screw air compressor.

[0039] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and the utility model concept of the utility model, and all these changes or substitutions should fall within the protection scope of the utility model.

Claims

1. A screw air compressor, characterized in that: The invention comprises a case (1), a control device (6) arranged on the case (1), an air compressor body (2) arranged in the case (1) and electrically connected to the control device (6), a centrifugal fan (3), a liquid-cooled motor (4) and a liquid cooling system (5), wherein the liquid cooling system (5) is connected to the liquid-cooled motor (4), the air compressor body (2) comprises an air filter (21), a screw compressor main unit (22), an oil-gas separator (23), an oil filter (24) and a cooling device (25), and the air filter ( 21), the screw compressor main unit (22), the oil-gas separator (23) and the cooling device (25) are connected in sequence, the oil filter (24) is connected to the screw compressor main unit (22) and the oil-gas separator (23) respectively, the screw compressor main unit (22) is connected to the liquid-cooled motor (4) through a coupling (7), and the chassis (1) is provided with a first air intake portion (11) connected to the air intake end of the air filter (21), and a second air intake portion (12) connected to the centrifugal fan (3).

2. A screw air compressor according to claim 1, characterized in that: The liquid cooling system (5) comprises a liquid cooling cooler (51), a cooling fan (52), a water tank (53), a circulation pump (54) and a liquid cooling inverter (55); the liquid cooling cooler (51), the water tank (53), the circulation pump (54) and the liquid cooling inverter (55) are connected in sequence; the liquid cooling motor (4) is connected to a water inlet of the liquid cooling cooler (51); the water outlet of the liquid cooling inverter (55) is connected to the liquid cooling motor (4); and the cooling fan (52) is arranged adjacent to the liquid cooling cooler (51).

3. A screw air compressor according to claim 1, characterized in that: The centrifugal fan (3) is placed horizontally in the chassis (1), and the second air inlet portion (12) comprises a first opening (121) arranged above the chassis (1), a second opening (122) arranged on one side of the chassis (1) corresponding to the air inlet end of the centrifugal fan (3), a partition (123) covering the first opening (121), and a filter (124) arranged on the second opening (122), and a cavity (125) is formed between the air inlet end of the centrifugal fan (3) and the filter (124), and the cooling device (25) is arranged in the cavity (125).

4. A screw air compressor according to claim 1 or 3, characterized in that: The cooling device (25) comprises an air cooler (251) connected to the air outlet end of the oil-gas separator (23), and an oil cooler (252) connected to the oil-gas separator (23) and the oil filter (24), respectively.

5. The screw air compressor according to claim 1, characterized in that: The first air inlet portion (11) comprises an air inlet (111) provided on the chassis (1), a cover body (112) fixed to the inner side of the chassis (1) corresponding to the air inlet (111), a through hole (113) provided on the cover body (112), and a wind blocking structure (114) and a precooling device (115) provided in the cover body (112); an air inlet end of the air filter (21) is connected to the through hole (113), and the through hole (113) and the air inlet (111) are arranged in a staggered manner.

6. A screw air compressor according to claim 5, characterized in that: The wind blocking structure (114) comprises two wind shields, which are arranged separately along the width direction of the cover body (112), and are respectively connected to the upper and lower ends of the cover body (112), so that the two wind shields form a curved air duct in the cover body (112).

7. The screw air compressor according to claim 5, characterized in that: The air compressor body (2) also includes a three-way valve (8) connecting the screw compressor main unit (22) and the oil filter (24), and the precooling device (115) includes cooling pipes respectively connected to the three-way valve (8) and the screw compressor main unit (22).

8. The screw air compressor according to claim 1, characterized in that: The oil-gas separator (23) comprises a tank body (231), a refueling port (232), an oil drain port (233), an air inlet pipe (234), an air outlet pipe (235), an inner tube (236), a limiting ring (237) and a clamping groove (238); the refueling port (232), the oil drain port (233), the air inlet pipe (234) and the air outlet pipe (235) are respectively arranged on the tank body (231); the inner tube (236) is detachably installed in the air inlet pipe (234); the clamping groove (238) is arranged on an open end of the air inlet pipe (234); the limiting ring (237) is placed on the clamping groove (238) and fixed to the clamping groove (238) by means of screws; the limiting ring (237) abuts against an end of the inner tube (236) close to the opening of the air inlet pipe (234).

9. The screw air compressor according to claim 1, characterized in that: The screw air compressor also includes a housing (71) sleeved on the outside of the coupling (7), a bracket (9) mounted on the housing (71), and a vibration sensor (10) disposed on the bracket (9).

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