Low-noise double-screw vacuum pump

Abstract

The utility model relates to the technical field of screw vacuum pumps, and discloses a low-noise double-screw vacuum pump which is characterized in that a pump body is provided with a gas inlet and a gas outlet; a filter box is arranged on the gas inlet, and a partition plate is arranged in the filter box and divides an inner cavity of the filter box into a filter cavity and an electrostatic dust collection cavity; air inlets are formed in the side surfaces of the filtering cavities; a gas transmission port is formed in the partition; a filter plate is arranged in the filter cavity, and the bottom surface of the filter cavity is funnel-shaped and is provided with a dust outlet I; the gas transmission port is positioned above the filter plate; a cathode mounting port is formed in the top surface of the electrostatic dust collection cavity, a cathode bar is arranged on the cathode mounting port through a mounting block, and a positive plate is arranged on the bottom surface of the electrostatic dust collection cavity and is provided with a positive terminal; a conveying opening is formed in the side face of the electrostatic dust collection cavity and communicates with the gas inlet. Gas entering the pump body is doubly filtered, the cleanliness of the gas entering the pump body is guaranteed, the probability that the screw rod is abraded by dust is greatly reduced, the pumping efficiency and the vacuum degree are guaranteed, and the pumping performance of the pump is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to screw vacuum pump technical field, concretely relates to low noise double screw vacuum pump. BACKGROUND

[0002] The screw vacuum pump is also called dry screw vacuum pump, which is a kind of pump that utilizes the high-speed rotation of the left screw and the right screw which are meshed and not contacted to transport the gas in the groove. The screw vacuum pump can remove a large amount of water vapor and a small amount of dust. There is no oil lubrication in the vacuum cavity, and the dust flows between the screws and the pump shell, and then is discharged from the exhaust port. The dust particles enter the pump and rub against the surface of the screw, causing wear and tear on the surface of the screw, which increases the clearance and affects the pumping efficiency and vacuum degree of the pump, and reduces the pumping performance of the pump.

[0003] The existing patent application with publication number CN216381858 U discloses a kind of low noise double screw vacuum pump, left end cover, right end cover are respectively arranged at the left and right ends of pump body, and silencing structure is arranged outside pump body, the noise problem existing in screw vacuum pump is improved, but gas is not handled, it is easy to make dust particles in gas wear screw surface, affect the pumping efficiency and vacuum degree of pump, reduce the pumping performance of pump. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of low noise double screw vacuum pump for reducing the probability of screw being worn by dust, improving the pumping performance of pump.

[0005] To solve the above technical problems, the utility model provides a kind of low noise double screw vacuum pump, including pump body, and silencing structure is arranged on the right end cover of pump body;Gas inlet and gas outlet are provided on the pump body;Filtering box is arranged on the gas inlet, and partition is arranged in the filtering box, and the inner chamber of filtering box is divided into filter cavity and electrostatic dust removal cavity by partition;Air inlet is arranged on the side of filter cavity;Gas inlet is formed in the partition;Filter plate is arranged in filter cavity, and filter plate is horizontally arranged, the bottom surface of filter cavity is funnel-shaped, and dust outlet one is arranged on the bottom surface of filter cavity;Gas inlet is located above filter plate;Negative electrode mounting port is arranged on the top surface of electrostatic dust removal cavity, mounting block is arranged on the negative electrode mounting port, negative electrode rod is fixed on the mounting block, and the bottom surface of electrostatic dust removal cavity is positive plate, and positive terminal is arranged on the positive plate;Conveying port is arranged on the side of electrostatic dust removal cavity, and conveying port is communicated with gas inlet by pipeline.

[0006] By adopting the technical scheme, the filter box is arranged on the gas inlet, and the gas entering the pump body is filtered twice through the filter cavity and the electrostatic dust removal cavity. The filter plate in the filter cavity can block most of the large dust particles, and the electrostatic dust removal cavity further removes the fine particles and dust by using the electrostatic principle, so that the cleanliness of the gas entering the pump body is ensured, the probability of screw wear caused by dust is greatly reduced, the pumping efficiency and vacuum degree are ensured, and the pumping performance of the pump is improved.

[0007] Preferably, the filter plate is uniformly provided with filter holes.

[0008] By adopting the technical scheme, the uniformly distributed filter holes ensure that the airflow and dust can pass through uniformly, avoiding local blockage or excessive wear.

[0009] Preferably, an inner thread is arranged on the inner wall of the negative electrode mounting port, an outer thread is arranged on the mounting block, and the inner thread and the outer thread are sealed by the raw material belt.

[0010] By adopting the technical scheme, the raw material belt is wound on the outer thread of the mounting block, and then the mounting block is screwed into the inner thread of the negative electrode mounting port, so that the mounting block is smoothly installed while the sealing performance of the negative electrode mounting port is ensured, gas leakage is avoided, and the working efficiency of the vacuum pump is ensured.

[0011] Preferably, a limiting step is arranged on the mounting block.

[0012] By adopting the technical scheme, the limiting step provides a clear stop point for the rotation of the thread, making the installation process more intuitive and simple. The installer only needs to rotate the thread to the limiting step, reducing the installation difficulty and the risk of misoperation.

[0013] Preferably, the positive electrode plate is funnel-shaped, and the central part of the positive electrode plate is provided with a dust discharge port two.

[0014] By adopting the technical scheme, the design of the funnel-shaped positive electrode plate allows the dust particles in the gas to gather on the positive electrode plate under the action of the electric field and then deposit at the bottom outlet by gravity. This not only helps to reduce the flying and diffusion of dust in the box, but also makes the deposited dust easily discharged through the bottom outlet, improving the dust removal efficiency and maintaining the cleanliness and efficient operation of the pump body.

[0015] Preferably, the sound insulation structure is double-layer sound insulation cotton, the inner layer of sound insulation cotton is pasted on the right end cover, and the inner layer of sound insulation cotton and the outer layer of sound insulation cotton have an air gap therebetween to form an air layer.

[0016] By adopting the technical scheme, the air gap with a certain thickness can hinder the propagation of sound and enhance the sound insulation performance.

[0017] Preferably, the double-layer sound insulation cotton is sealed by sound insulation foam on both sides.

[0018] By adopting the technical scheme, the double-layer sound insulation cotton is enclosed into a cavity by sound insulation foam, so that the best sound insulation effect is ensured.

[0019] Compared with the prior art, the utility model has the advantages that:

[0020] 1. The filter box is arranged on the gas inlet, and double filtration of the gas entering the pump body is realized through the filter cavity and the electrostatic dust removal cavity in the filter box. The filter plate in the filter cavity can block most of the large dust particles, and the electrostatic dust removal cavity further removes the fine particles and dust by using the electrostatic principle, so that the cleanliness of the gas entering the pump body is ensured, the probability of screw wear caused by dust is greatly reduced, the pumping efficiency and vacuum degree are ensured, and the pumping performance of the pump is improved.

[0021] 2. The noise reduction structure arranged on the right end cover effectively reduces the noise during the operation of the pump body, so that the vacuum pump not only maintains high efficiency, but also has good noise reduction characteristics.

[0022] 3. The bottom surface of the filter cavity is designed in a funnel shape, dust is collected and discharged through the dust discharge port, the dust removal efficiency is improved, and the cleanliness and efficient operation of the pump body are maintained. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structural schematic view of the utility model;

[0024] Figure 2 It is a structural schematic view of the filter box of the utility model;

[0025] Figure 3 It is a structural schematic view of the mounting block of the utility model;

[0026] Figure 4 It is a structural schematic view of the noise reduction structure of the utility model.

[0027] Figure number: 1. Pump body, 2. Left end cover, 3. Right end cover, 4. Noise reduction structure, 5. Gas inlet, 6. Gas outlet, 7. Filter box, 8. Partition, 9. Filter cavity, 10. Electrostatic dust removal cavity, 11. Gas inlet, 12. Gas inlet, 13. Filter plate, 14. Dust discharge port one, 15. Negative electrode mounting port, 16. Mounting block, 17. Negative electrode rod, 18. Positive plate, 19. Positive terminal, 20. Dust discharge port two, 21. Conveying port, 22. Filter hole, 23. Raw material belt, 24. Inner layer sound insulation cotton, 25. Outer layer sound insulation cotton, 26. Air layer, 27. Sound insulation foam, 28. Limiting step. DETAILED DESCRIPTION

[0028] For example, Figure 1As shown in the low noise double screw vacuum pump, comprising a pump body 1, the pump body 1 is provided with a driving screw and a driven screw, the driving screw and the driven screw are respectively supported and installed in the left end cover 2 and the right end cover 3 through bearings at two ends, a main gear is fixedly arranged on the driving screw, a secondary gear is arranged on the driven screw, the main gear and the secondary gear are in meshing transmission; the main gear and the secondary gear are rotatably installed in the right end cover 3. The right end cover 3 is provided with a sound attenuation structure 4. The sound attenuation structure 4 arranged on the right end cover 3 effectively reduces the noise when the pump body 1 operates, so that the vacuum pump not only maintains high efficiency, but also has good silent characteristics. The pump body 1 is provided with a gas inlet 5 and a gas outlet 6. The gas inlet 5 is provided with a filter box 7.

[0029] As Figure 2 shown, the filter box 7 is provided with a partition plate 8, which divides the inner cavity of the filter box 7 into a filter cavity 9 and an electrostatic dust removal cavity 10; the side of the filter cavity 9 is provided with an air inlet 11; the partition plate 8 is provided with a gas inlet 12; the filter cavity 9 is provided with a filter plate 13, which is a metal filter plate 13 and can withstand high pressure difference, which is beneficial to the air compression work of the high-pressure air compression system. The filter plate 13 is horizontally arranged, and the bottom surface of the filter cavity 9 is funnel-shaped. The funnel-shaped design of the filter cavity bottom surface facilitates dust collection and discharge through the dust discharge port 1, which not only improves the dust removal efficiency, but also maintains the cleanliness and efficient operation of the pump body 1. The filter plate 13 is uniformly provided with filter holes 22 to ensure that the airflow and dust can pass through uniformly, avoiding local blockage or excessive wear. The bottom surface of the filter cavity 9 is provided with a dust discharge port 1 14; the gas inlet 12 is located above the filter plate 13; the top surface of the electrostatic dust removal cavity 10 is provided with a negative electrode mounting port 15, the negative electrode mounting port 15 is provided with a mounting block 16, the mounting block 16 is fixedly provided with a negative electrode rod 17, the bottom surface of the electrostatic dust removal cavity 10 is provided with a positive electrode plate 18, the positive electrode plate 18 is provided with a positive electrode terminal 19; the side of the electrostatic dust removal cavity 10 is provided with a conveying port 21, which is communicated with the gas inlet 5 through a pipeline. The present application is provided with a filter box on the gas inlet 5, which realizes double filtration of the gas entering the pump body 1 through the internal filter cavity 9 and electrostatic dust removal cavity 10. The filter plate 13 in the filter cavity 9 can block most of the large dust particles, and the electrostatic dust removal cavity 10 further removes small particles and dust by using the principle of static electricity, ensuring the cleanliness of the gas entering the pump body, greatly reducing the probability of screw wear due to dust, ensuring the pumping efficiency and vacuum degree, and improving the pumping performance of the pump.

[0030] The inner wall of the negative electrode mounting port 15 is provided with an internal thread, and the mounting block 16 is provided with an external thread. The internal thread and the external thread are sealed by a raw material belt 23. The raw material belt 23 is wound on the external thread of the mounting block 16, and then the mounting block 16 is screwed into the internal thread of the negative electrode mounting port 15, so that the mounting block 16 is smoothly installed, and the sealing performance of the negative electrode mounting port 15 is ensured, avoiding gas leakage and ensuring the working efficiency of the vacuum pump.

[0031] AsFigure 3 As shown, a limiting step 28 is arranged on the mounting block 16. The presence of the limiting step 28 provides a clear stop point for the rotation of the screw, making the installation process more intuitive and simple, and the installer only needs to rotate the screw to the limiting step, reducing the difficulty of installation and the risk of misoperation.

[0032] The positive plate 18 is funnel-shaped, and a dust discharge port two 20 is arranged at the center of the positive plate 18. The design of the funnel-shaped positive plate allows the dust particles in the gas to gather on the positive plate under the action of the electric field and then deposit at the bottom outlet by gravity. This not only helps to reduce the flying and diffusion of dust in the box, but also makes the deposited dust easily discharged through the bottom outlet, improving the dust removal efficiency and maintaining the cleanliness and efficient operation of the pump body.

[0033] As shown in the drawings, Figure 4 The sound insulation structure 4 is double-layer sound insulation cotton, mainly composed of inner layer sound insulation cotton 24, outer layer sound insulation cotton 25 and sound insulation foam 27. The inner layer sound insulation cotton 24 is pasted on the right end cover 3, and there is an air gap between the inner layer sound insulation cotton 24 and the outer layer sound insulation cotton 25, forming an air layer 26. The air layer 26 can hinder the propagation of sound and enhance the sound insulation performance by setting a certain thickness of air gap.

[0034] The double-layer sound insulation cotton is sealed on both sides by sound insulation foam 27, which closes the double-layer sound insulation cotton into a cavity to ensure the best sound insulation effect.

[0035] The mounting base of the pump body 1 is provided with a vibration damping pad to reduce the transmission of vibration to the ground or surrounding structure, thereby further reducing noise.

[0036] During vacuumizing, the gas is first filtered by the filter box 7, and then sucked in, compressed and discharged by the driving screw and the driven screw in the pump body 1. The gas enters the filter cavity 9, filters the larger dust particles through the filter plate 13, and then enters the electrostatic dust removal cavity 10 from the gas inlet 12. The negative electrode rod 17 and the positive plate 18 are electrified. The tiny particles and dust are charged and separated from the airflow under the action of the electric field, and then fall down and gather on the positive plate 18 under the action of gravity, and then are discharged through the dust discharge port two 20. After dust removal, the gas enters the gas inlet 5 on the pump body 1 from the conveying port 21.

[0037] It should be understood by those skilled in the art that the above description and the embodiments of the utility model shown in the drawings are only examples and do not limit the utility model. The purpose of the utility model has been completely and effectively realized. The function and structure principle of the utility model have been demonstrated and explained in the embodiments, and the implementation of the utility model can be any deformation or modification without departing from the principle.

Claims

1. A low-noise double screw vacuum pump, comprising a pump body (1), a sound attenuation structure (4) is arranged on the right end cover (3) of the pump body (1); a gas inlet (5) and a gas outlet (6) are arranged on the pump body (1); characterized in that: The gas inlet (5) is provided with a filter box (7), the filter box (7) is provided with a partition plate (8), the partition plate (8) divides the cavity in the filter box (7) into a filter cavity (9) and an electrostatic dust removal cavity (10); The filter cavity (9) is provided with an air inlet (11) on the side; The partition plate (8) is provided with a gas inlet (12); The filter cavity (9) is provided with a filter plate (13), the filter plate (13) is horizontally arranged, the bottom surface of the filter cavity (9) is funnel-shaped, and the bottom surface of the filter cavity (9) is provided with a dust outlet (14); The gas inlet (12) is located above the filter plate (13); The electrostatic dust removal cavity (10) is provided with a negative electrode mounting hole (15) on the top surface, the negative electrode mounting hole (15) is provided with a mounting block (16), the mounting block (16) is fixedly provided with a negative electrode rod (17), the bottom surface of the electrostatic dust removal cavity (10) is provided with a positive electrode plate (18), and the positive electrode plate (18) is provided with a positive electrode terminal (19); The electrostatic dust removal cavity (10) is provided with a conveying port (21) on the side, and the conveying port (21) is communicated with the gas inlet (5) through a pipeline.

2. A low noise twin screw vacuum pump according to claim 1, characterized in that: The filter plate (13) is uniformly provided with filter holes (22).

3. A low noise twin screw vacuum pump according to claim 1, characterized in that: The inner wall of the negative electrode mounting hole (15) is provided with an internal thread, the mounting block (16) is provided with an external thread, and the internal thread and the external thread are sealed by a raw material belt (23).

4. A low noise twin screw vacuum pump according to claim 1, characterized in that: The mounting block (16) is provided with a limiting step (28).

5. A low noise twin screw vacuum pump according to claim 1, characterized in that: The positive electrode plate (18) is funnel-shaped, and the positive electrode plate (18) is provided with a dust outlet (20) in the center.

6. A low noise twin screw vacuum pump according to claim 1, characterized in that: The sound insulation structure (4) is double-layer sound insulation cotton, the inner layer sound insulation cotton (24) is attached to the right end cover (3), and the inner layer sound insulation cotton (24) and the outer layer sound insulation cotton (25) have an air gap, forming an air layer (26).

7. A low noise twin screw vacuum pump according to claim 6, characterised in that: The double-layer sound insulation cotton is sealed by sound insulation foam (27) on both sides.

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