Permanent magnet type screw air compressor

Abstract

The utility model discloses a permanent magnet type screw air compressor which is characterized in that a mounting shell is connected with an air storage tank through a connecting pipe, and the mounting shell is connected with a cooler through a circulating pipe; the separating piece comprises a filter and an oil baffle plate; the side wall of the bottom of the mounting shell is obliquely arranged, the connecting pipe is arranged on the front side of the mounting shell, the filter is of a cylindrical structure and is circumferentially provided with a plurality of filtering holes, one end of the filter is hermetically connected with the inner wall of the mounting shell, and the other end of the filter is hermetically connected with the connecting pipe; the baffles are arranged on the upper side and the lower side in the installation shell in a staggered mode, a passing opening is formed in the bottom of the baffle located on the lower side, a first backflow opening is formed in the bottom of the installation shell, and the first backflow opening communicates with the cooling shell. The staggered oil baffles can increase the contact area with the compressed air and block oil drops in the compressed air, and the gathered lubricating oil flows back into the cooling shell through the first backflow opening.

Description

Technical Field

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

[0002] Permanent magnet screw air compressor is an air compressor driven by permanent magnet synchronous motor. It uses the characteristics of permanent magnet synchronous motor to achieve efficient and energy-saving air compression operation. Permanent magnet synchronous motor has the advantages of high efficiency, high power factor, high torque density, etc., which makes permanent magnet screw air compressor have obvious advantages in energy saving, environmental protection and stable operation. The working principle of permanent magnet screw air compressor is to drive the screw compressor to work through permanent magnet synchronous motor. Permanent magnet synchronous motor generates magnetic field through electromagnetic induction principle, which interacts with the magnetic field on the stator to drive the screw compressor to perform compression operation. The screw compressor has a pair of rotors with helical teeth that mesh with each other and rotate in opposite directions. The rotor with raised tooth surface is called male rotor, and the rotor with concave tooth surface is called female rotor. As the rotor rotates in the body, the working volume changes continuously due to the intrusion or disengagement of the teeth, thereby periodically changing the volume between each pair of tooth slots of the rotor to achieve the purpose of suction, compression and exhaust.

[0003] Most screw compressors adopt oil injection lubrication. The lubricating oil is mixed with the joints and enters the compressor, and the machine is lubricated and sealed as the medium flows. Due to the working principle and structural characteristics of the screw compressor, the lubricating oil is easily mixed with the compressed air. Inside the screw compressor, the lubricating oil will lubricate the screw and bearings and other components, but in the compressed air, due to the high-speed rotation of the screw and the high-temperature compression process, the lubricating oil will be brought into the compressed air, forming lubricating oil atomization, causing the lubricating oil and compressed air to mix together. Therefore, the air tank of the self-air compressor is mixed with lubricating oil. Although most of the lubricating oil entering the air tank will be separated from the compressed air and deposited at the bottom of the air tank, there will still be some atomized lubricating oil mixed with the compressed air. In order to ensure the cleanliness of the user's airway, the compressed air needs to be filtered before use. However, the existing technology usually only uses one filter element for filtering, and there is a problem of poor oil-gas separation effect.

[0004] A screw air compressor is disclosed in the patent with publication number CN115450913A. This structure is provided with a shell, and the bottom of the shell is provided with a motor, a transmission mechanism, a screw air compressor mechanism and an oil-gas separation box in sequence. This arrangement can use lubricating oil to directly cool the screw, but it will cause more oil in the air tank, and in addition to leading the oil away, oil and gas separation is also required. The oil-liquid separation box in the above application only separates through a filter screen, and there is a problem of poor oil-gas separation effect, which will cause a high oil content in the compressed air in the user's airway. Utility Model Content

[0005] The purpose of the utility model is to provide a permanent magnet screw air compressor to solve the following technical problems raised in the background technology:

[0006] The air compressor in the prior art has poor oil-gas separation effect, and the oil content in the user's airway is relatively high.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0008] A permanent magnet screw air compressor comprises a permanent magnet motor, a main engine, a cooler, an air storage tank and a cooling shell; wherein the permanent magnet motor is connected to the main engine and is used to drive the screw in the main engine to rotate, the cooling shell is arranged on the outside of the air storage tank, the main engine is connected to the air storage tank and the cooling shell, the main engine, the air storage tank and the cooling shell are all connected to the cooler, and an oil-gas separation device is arranged at the air outlet of the air storage tank.

[0009] The oil-gas separation device comprises a connecting pipe, a mounting shell, a flow pipe and a separator; the connecting pipe is connected to the mounting shell, the flow pipe is connected to the mounting shell, and the separator is arranged in the mounting shell; the mounting shell is connected to the gas storage tank through the connecting pipe, and the mounting shell is connected to the cooler through the flow pipe;

[0010] The separation part includes a filter and an oil baffle; the side wall of the bottom of the installation shell is inclined, the connecting pipe is arranged on the front side of the installation shell, the filter is a cylindrical structure and has a plurality of filter holes arranged circumferentially, one end of the filter is sealedly connected to the inner wall of the installation shell and the other end is sealedly connected to the connecting pipe; the baffles are staggered on the upper and lower sides of the installation shell, wherein the bottom of the baffle located on the lower side is provided with a through port, and the bottom of the installation shell is provided with a first reflux port, which is connected to the cooling shell.

[0011] Furthermore, a baffle is provided between the connecting pipe and the mounting shell, and the connecting pipe is connected to the mounting shell through the baffle;

[0012] The baffle part includes a baffle box and a baffle plate; one side of the bottom of the baffle plate is movably sealed and connected to the top of the baffle box; an air outlet is arranged at the bottom of the baffle plate, and a second return outlet is arranged at the bottom of the baffle box, and the second return outlet is connected to the cooling shell.

[0013] Furthermore, the side walls on both sides of the bottom of the mounting shell are inclined, and the oil baffles are symmetrically arranged on both sides of the mounting shell; the flow pipe includes a first flow pipe and a second flow pipe, and the first flow pipe and the second flow pipe are symmetrically arranged on both sides of the top of the mounting shell.

[0014] Furthermore, the filter is a stainless steel filter made of stainless steel material.

[0015] Furthermore, the main engine is provided with a first oil inlet, a first oil outlet, a first air inlet and a first air outlet; a cooling shell is provided outside the air storage tank, a second air inlet and a second air outlet are provided on the air storage tank, a second oil inlet, a second oil outlet and a total oil return port are provided on the cooling shell; the cooler includes an oil cooler and an air cooler;

[0016] The first oil outlet is connected to the second oil inlet through an oil outlet pipeline, and the first air outlet is connected to the second air inlet through an air outlet pipeline; the second oil outlet is connected to the oil cooler through an oil cooling pipeline; the oil cooler is connected to the first oil inlet through an oil inlet pipeline; the second air outlet is connected to the connecting pipe; the first return port and the second return port are both connected to the main oil return port through the oil return pipeline; the flow pipe in the oil-gas separation device is connected to the gas cooler through the gas cooling pipeline, and the gas cooler is also connected to the gas use end.

[0017] Furthermore, an oil return pipe is provided between the oil cooling pipe and the oil inlet pipe, one end of the oil return pipe is connected to the oil cooling pipe, and the other end is connected to the oil inlet pipe through a three-way valve.

[0018] Furthermore, a one-way valve is provided on the oil return pipeline.

[0019] Furthermore, an air-water separator is provided between the air cooler and the air-using end.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] The staggered oil baffles in the utility model can increase the contact area with the compressed air as much as possible. When the compressed air passes through the oil baffles, the gas in the compressed air is deflected and flows away, and the oil droplets in the compressed air hit the oil baffles and gather on the oil baffles. Finally, the gathered oil flows down from the oil baffles and flows from the through port to the bottom of the mounting shell, and finally flows back to the cooling shell from the first return port. The gas in the compressed air flows away through the circulation pipe for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of the oil-gas separation device of the utility model;

[0023] Figure 2 This is a schematic diagram of the internal structure of the oil-gas separation device of the utility model;

[0024] Figure 3 This is the second schematic diagram of the internal structure of the oil-gas separation device of the utility model;

[0025] Figure 4 It is a system flow diagram of the entire device of the utility model.

[0026] Markings in the figure: 1-connecting pipe, 2-baffle, 3-first flow pipe, 4-second flow pipe, 5-installation shell, 6-baffle, 8-first return port, 9-filter, 10-through port, 11-oil baffle, 12-gas port, 13-baffle box, 14-second return port, 15-oil-gas separation device, 16-return oil pipeline, 17-gas cooling pipeline, 18-cooling shell, 19-second oil outlet, 20-oil cooling pipe , 21-air cooler, 22-oil cooler, 23-three-way valve, 24-oil inlet pipeline, 25-first oil inlet, 26-first air inlet, 27-main engine, 28-permanent magnet motor, 29-second air outlet, 30-air outlet pipeline, 31-first air outlet, 32-first oil outlet, 33-oil outlet pipeline, 34-return oil pipeline, 35-air storage tank, 36-second oil inlet, 37-total oil return port, 38-second air inlet. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Example

[0029] A permanent magnet screw air compressor includes a permanent magnet motor 28, a main engine 27, a cooler, an air storage tank 35 and a cooling shell 18; wherein the permanent magnet motor 28 is connected to the main engine 27 and is used to drive the screw in the main engine 27 to rotate, the cooling shell 18 is arranged outside the air storage tank 35, the main engine 27 is connected to the air storage tank 35 and the cooling shell 18, the main engine 27, the air storage tank 35 and the cooling shell 18 are all connected to the cooler, and the air outlet of the air storage tank 35 is provided with an oil-gas separation device 15:

[0030] The oil-gas separation device 15 includes a connecting pipe 1, a mounting shell 5, a flow pipe and a separator; the connecting pipe 1 is connected to the mounting shell 5, the flow pipe is connected to the mounting shell 5, and the separator is arranged in the mounting shell 5; the mounting shell 5 is connected to the gas storage tank 35 through the connecting pipe 1, and the mounting shell 5 is connected to the cooler through the flow pipe;

[0031] The separation part includes a filter 9 and an oil baffle plate 11; the side wall of the bottom of the mounting shell 5 is inclined, the connecting pipe 1 is arranged on the front side of the mounting shell 5, the filter 9 is a cylindrical structure and has a plurality of filter holes arranged circumferentially, one end of the filter 9 is sealedly connected to the inner wall of the mounting shell 5 and the other end is sealedly connected to the connecting pipe 1; the oil baffle plates 11 are staggered on the upper and lower sides of the mounting shell 5, wherein the bottom of the oil baffle plate 11 located on the lower side is provided with a through port 10, and the bottom of the mounting shell 5 is provided with a first reflux port 8, and the first reflux port 8 is connected to the cooling shell 18.

[0032] Specifically, when the air storage tank 35 is in use, when the compressed air is released for use, the compressed air will pass through the oil-gas separation device 15. When the compressed air passes through the oil-gas separation device 15, it will first enter the installation shell 5 through the connecting pipe 1. Since one end of the connecting pipe 1 is connected to the filter 9, the compressed air needs to enter the installation shell 5 from the filter 9. The filter 9 separates part of the oil in the compressed air by blocking and filtering. After entering the installation shell 5, the compressed air will contact the oil baffle 11 in the installation shell 5. The staggered oil baffles 11 can increase the contact area with the compressed air as much as possible. When the compressed air passes through the oil baffle 11, the gas in the compressed air is deflected and flows away, and the oil droplets in the compressed air hit the oil baffle 11 and converge on the oil baffle 11. Finally, the converged oil flows down from the oil baffle 11 and flows from the through port 10 to the bottom of the installation shell 5, and finally flows back to the cooling shell 18 from the first reflux port 8. The gas in the compressed air flows away through the circulation pipe for use.

[0033] In a preferred embodiment, a baffle 6 is further provided between the connecting pipe 1 and the mounting housing 5, and the connecting pipe 1 is connected to the mounting housing 5 via the baffle 6;

[0034] The deflector portion 6 includes a deflector box 13 and a deflector plate 2; one side of the bottom of the deflector plate 2 is movably sealed and connected to the top of the deflector box 13; an air port 12 is provided at the bottom of the deflector plate 2, and a second return port 14 is provided at the bottom of the deflector box 13, and the second return port 14 is connected to the cooling shell 18.

[0035] The deflector 6 is used to further improve the oil-gas separation effect. Its main principle is that the compressed air hits the deflector 2 in the deflector box 13, the gas flows away after being deflected, and the oil droplets will adhere to the deflector 2 after hitting the deflector 2. The oil droplets attached to the deflector 2 gather and flow to the bottom of the deflector box 13 and flow back to the cooling shell 18 from the second reflux port 14.

[0036] In a preferred embodiment, the side walls on both sides of the bottom of the installation shell 5 are inclined, and the oil baffles 11 are symmetrically arranged on both sides of the installation shell 5; the circulation pipe includes a first circulation pipe 3 and a second circulation pipe 4, and the first circulation pipe 3 and the second circulation pipe 4 are symmetrically arranged on both sides of the top of the installation shell 5. Through this design, the compressed air entering the installation shell 5 will flow to both sides of the cooling shell 18 body 7, and the oil content in the compressed air will be reduced through the oil baffles 11 on both sides. At the same time, through this design, the flow rate of the compressed air can be increased under the premise of ensuring oil filtration.

[0037] In a preferred embodiment, the filter 9 is a stainless steel filter 9 made of stainless steel material. This filter 9 has the advantages of strong corrosion resistance, good high temperature resistance, long service life, etc.

[0038] In a preferred embodiment, the main engine 27 is provided with a first oil inlet 25, a first oil outlet 32, a first air inlet 26 and a first air outlet 31; a cooling shell 18 is provided outside the air storage tank 35, a second air inlet 38 and a second air outlet 29 are provided on the air storage tank 35, a second oil inlet 36, a second oil outlet 19 and a total oil return port 37 are provided on the cooling chamber; the cooler includes an oil cooler 22 and an air cooler 21;

[0039] The first oil outlet 32 ​​is connected to the second oil inlet 36 through the oil outlet pipe 33, and the first air outlet 31 is connected to the second air inlet 38 through the air outlet pipe 30; the second oil outlet 19 is connected to the oil cooler 22 through the oil cooling pipe 20; the oil cooler 22 is connected to the first oil inlet 25 through the oil inlet pipe 24; the second air outlet 29 is connected to the connecting pipe 1; the first return port 8 and the second return port 14 are both connected to the total oil return port 37 through the return oil pipe 16; the flow pipe in the oil-gas separation device 15 is connected to the gas cooler 21 through the gas cooling pipe 17, and the gas cooler 21 is also connected to the useful gas end.

[0040] When the main engine 27 is working, the outside air enters the main engine 27 through the first air inlet 26, and the air leaves the main engine 27 through the first air outlet 31 after being compressed and enters the air outlet pipe 30, and then enters the air storage tank 35 through the second air inlet 38. When compressed air is needed, the compressed air flows out through the second air outlet 29 for convenient use. At the same time, when the main engine 27 is working, the lubricating oil in the main engine 27 flows out through the first oil outlet 32 ​​and enters the cooling shell 18, and the lubricating oil in the cooling shell 18 cools the compressed air, and then the lubricating oil enters the oil cooler 22 through the second oil outlet 19 and the oil cooling pipe 20 for cooling, and the cooled lubricating oil enters the main engine 27 through the oil inlet pipe 24 and the first oil inlet 25. The oil separated by the oil-gas separation device 15 flows back to the cooling shell 18 through the oil return pipe 16, so that the separated oil can continue to be used in the cooling and lubrication system.

[0041] In a preferred embodiment, an oil return pipe 34 is provided between the oil cooling pipe 20 and the oil inlet pipe 24. One end of the oil return pipe 34 is connected to the oil cooling pipe 20, and the other end is connected to the oil inlet pipe 24 through a three-way valve 23. When the cooler fails to completely cool the lubricating oil, the oil inlet pipe 24 is connected to the oil cooling pipe 20 through the three-way valve 23, so that the lubricating oil does not enter the oil cooler 22, thereby ensuring the cooling effect of the cooler on the existing oil therein. After the lubricating oil in the oil cooler 22 is fully cooled, the oil inlet pipe 24 is disconnected from the oil cooling pipe 20 by controlling the three-way valve 23, and at this time, cold oil can be supplied while cooling hot oil. The stability of the system is ensured.

[0042] In a preferred embodiment, a one-way valve is provided on the oil return pipe 16 , so as to prevent the lubricating oil in the cooling shell 18 from being backwashed into the oil-gas separation device 15 through the oil return pipe 16 .

[0043] In a preferred embodiment, an air-water separator is further provided between the air cooler 21 and the air-using end. After the compressed air is cooled by the air cooler 21, the water vapor in the compressed air is easily condensed into water, resulting in a large amount of liquid water in the compressed air. Therefore, it is necessary to provide an air-water separator to absorb the moisture in the compressed air.

[0044] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0045] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0046] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A permanent magnet screw air compressor, comprising a permanent magnet motor (28), a main engine (27), a cooler, an air storage tank (35) and a cooling shell (18); wherein: The permanent magnet motor (28) is connected to the main machine (27) and is used to drive the screw in the main machine (27) to rotate. The cooling shell (18) is arranged outside the gas storage tank (35). The main machine (27) is connected to the gas storage tank (35) and the cooling shell (18). The main machine (27), the gas storage tank (35) and the cooling shell (18) are all connected to a cooler. The gas outlet of the gas storage tank (35) is provided with an oil-gas separation device (15). The invention is characterized in that: The oil-gas separation device (15) comprises a connecting pipe (1), a mounting shell (5), a circulation pipe and a separation piece; the connecting pipe (1) is connected to the mounting shell (5), the circulation pipe is connected to the mounting shell (5), and the separation piece is arranged in the mounting shell (5); the mounting shell (5) is connected to the gas storage tank (35) through the connecting pipe (1), and the mounting shell (5) is connected to the cooler through the circulation pipe; The separation element comprises a filter (9) and an oil baffle plate (11); the side wall of the bottom of the mounting shell (5) is arranged obliquely, the connecting pipe (1) is arranged on the front side of the mounting shell (5), the filter (9) is a cylindrical structure and is provided with a plurality of filter holes in the circumference, one end of the filter (9) is sealedly connected to the inner wall of the mounting shell (5) and the other end is sealedly connected to the connecting pipe (1); the oil baffle plates (11) are arranged alternately on the upper and lower sides of the mounting shell (5), wherein the bottom of the oil baffle plate (11) located on the lower side is provided with a through port (10), and the bottom of the mounting shell (5) is provided with a first return port (8), and the first return port (8) is connected to the cooling shell (18).

2. A permanent magnet screw air compressor according to claim 1, characterized in that: A baffle (6) is also provided between the connecting pipe (1) and the mounting shell (5), and the connecting pipe (1) is connected to the mounting shell (5) via the baffle (6); The baffle portion (6) comprises a baffle box (13) and a baffle plate (2); one side of the bottom of the baffle plate (2) is movably sealed and connected to the top of the baffle box (13); an air port (12) is provided at the bottom of the baffle plate (2), and a second return port (14) is provided at the bottom of the baffle box (13); the second return port (14) is connected to the cooling shell (18).

3. A permanent magnet screw air compressor according to claim 1, characterized in that: The side walls on both sides of the bottom of the installation shell (5) are arranged obliquely, and the oil baffle plates (11) are symmetrically arranged on both sides of the installation shell (5); the flow pipe includes a first flow pipe (3) and a second flow pipe (4), and the first flow pipe (3) and the second flow pipe (4) are symmetrically arranged on both sides of the top of the installation shell (5).

4. A permanent magnet screw air compressor according to claim 1, characterized in that: The filter (9) is a stainless steel filter (9) made of stainless steel material.

5. A permanent magnet screw air compressor according to claim 1, characterized in that: The main engine (27) is provided with a first oil inlet (25), a first oil outlet (32), a first air inlet (26) and a first air outlet (31); a cooling shell (18) is provided on the outside of the air storage tank (35); a second air inlet (38) and a second air outlet (29) are provided on the air storage tank (35); a second oil inlet (36), a second oil outlet (19) and a total oil return port (37) are provided on the cooling shell (18); the cooler comprises an oil cooler (22) and an air cooler (21); The first oil outlet (32) is connected to the second oil inlet (36) via an oil outlet pipeline (33), and the first gas outlet (31) is connected to the second gas inlet (38) via a gas outlet pipeline (30); the second oil outlet (19) is connected to the oil cooler (22) via an oil cooling pipeline (20); the oil cooler (22) is connected to the first oil inlet (25) via an oil inlet pipeline (24); the second gas outlet (29) is connected to the connecting pipe (1); the first return port (8) and the second return port (14) are both connected to the main oil return port (37) via an oil return pipeline (16); the flow pipe in the oil-gas separation device (15) is connected to the gas cooler (21) via a gas cooling pipeline (17), and the gas cooler (21) is also connected to a useful gas end.

6. A permanent magnet screw air compressor according to claim 5, characterized in that: An oil return pipe (34) is provided between the oil cooling pipe (20) and the oil inlet pipe (24); one end of the oil return pipe (34) is connected to the oil cooling pipe (20), and the other end is connected to the oil inlet pipe (24) via a three-way valve (23).

7. A permanent magnet screw air compressor according to claim 1, characterized in that: A one-way valve is provided on the oil return pipeline (16).

8. The permanent magnet screw air compressor according to claim 1, characterized in that: An air-water separator is also provided between the air cooler (21) and the air using end.

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