Intake filtering structure of screw vacuum pump

Abstract

The utility model relates to screw rod vacuum pump technical field discloses a kind of air intake filter structure of screw rod vacuum pump, including filter box, the top of filter box is equipped with sealing cover, the side of filter box is fixedly connected with air inlet pipe, the other side of filter box is fixedly connected with air outlet pipe, the inside of filter box is provided with three filter plates side by side, the inside of one of the filter plate is provided with cleaning brush plate, the inside of another filter plate is equipped with polyester fiber plate, the both sides of filter plate are fixedly connected with side sliding block, the sidewall of filter box is provided with multiple clamping components, the clamping component is used to the side sliding block is fixed and installed. In the utility model, by setting the filter plate with internal cleaning brush plate, it can be cleaned to ensure filtering efficiency. At the same time, it uses the mechanical clamping component linked with sealing cover, so that the filter plate is more stable, and disassembly and maintenance are more convenient.

Description

Technical Field

[0001] This utility model relates to the field of screw vacuum pump technology, and in particular to an air intake filter structure for a screw vacuum pump. Background Technology

[0002] Currently, screw vacuum pumps, as a type of dry, non-contact vacuum generating device, are widely used in many high-precision manufacturing fields such as semiconductors, chemicals, pharmaceuticals, and coating due to their advantages of being clean and oil-free, simple in structure, and insensitive to condensable gases and small particles. The core of these pumps relies on the high-speed rotation of a pair of precisely meshing but non-contact screw rotors to pump gas. The gaps between the rotors and between the rotors and the pump casing are extremely small, typically at the micrometer level. Therefore, the ingress of any hard particles or dust can cause fatal wear or jamming of the rotors, leading to a decline in pump performance or even scrapping. Thus, installing a high-efficiency filtration structure at the inlet is a necessary prerequisite for ensuring stable operation.

[0003] Regarding the aforementioned issues, a common existing application is a filtration device with a cylindrical metal casing containing a replaceable pleated cylindrical filter element. During operation, dust-laden gas enters the filter through a tangential or lateral inlet. Under centrifugal force and gravity, larger particles settle to the bottom of the cylinder. The gas then must pass through the central cylindrical filter element; dust is trapped on the outer surface, while clean gas flows to the vacuum pump from the top outlet. When maintenance is required, the operator stops the equipment, manually loosens and removes the top cover or flange of the filter, removes the contaminated filter element from the cylinder, replaces it with a new one, and then reinstalls and tightens the cover.

[0004] However, in practical applications, existing technical solutions have revealed several shortcomings. First, when the filter element surface is covered with dust to a certain extent, the cleaning process becomes particularly cumbersome. Operators must interrupt production, disassemble the entire filtration device, and remove the filter element for replacement or external cleaning. This not only interrupts production continuity but also increases auxiliary work time and spare parts costs, making rapid online or semi-online cleaning impossible and affecting overall operating efficiency. Second, the existing methods of fixing filter plates or filter elements also have limitations. Their installation usually relies on the downward pressure of the top cover for passive positioning, lacking an active and reliable locking structure. Under conditions such as equipment vibration, the filter element may undergo slight displacement, creating sealing gaps, allowing some dust-laden gas to bypass the filter element and directly enter the pump body. Finally, the process of disassembling and replacing the filter element is not convenient enough. Disassembling and assembling the top cover often requires the use of tools to loosen or tighten multiple fastening bolts one by one, which is not only time-consuming and labor-intensive, but also relies on manual operation for the tightening force of the bolts, making it difficult to ensure uniformity each time and posing a risk of poor sealing.

[0005] To address the above problems, an air intake filter structure for a screw vacuum pump is proposed. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides an air intake filter structure for a screw vacuum pump, aiming to solve the problems of difficult cleaning, unstable fixing, and cumbersome disassembly and maintenance of the filter plate in the existing air intake filter structure of a screw vacuum pump.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: an air intake filtration structure for a screw vacuum pump, comprising a filter box, a sealing cover installed on the top of the filter box, an air intake pipe fixedly connected to one side of the filter box, an air outlet pipe fixedly connected to the other side of the filter box, three filter plates arranged side by side inside the filter box, one of the filter plates having a cleaning brush plate inside, and another filter plate having a polyester fiber plate inside, with side sliders fixedly connected to both sides of each filter plate, and multiple snap-fit ​​components provided on the side wall of the filter box for fixing and installing the side sliders.

[0008] As a further description of the above technical solution:

[0009] The filter plate has a through groove inside, and the cleaning brush is slidably connected inside the filter plate. The bottom of the cleaning brush is slidably connected to the inner bottom wall of the filter box.

[0010] As a further description of the above technical solution:

[0011] The filter box has multiple inner grooves on its side wall, and the bottom of the filter box is provided with insert blocks around its perimeter, which are inserted into the inner grooves.

[0012] As a further description of the above technical solution:

[0013] The filter box has a side sliding groove on its side wall, and the side slider is slidably connected inside the side sliding groove.

[0014] As a further description of the above technical solution:

[0015] Flanges are installed on opposite sides of the air inlet and air outlet pipes.

[0016] As a further description of the above technical solution:

[0017] The snap-fit ​​assembly includes a pressure rod and a stop rod. The middle part of the pressure rod and the stop rod are respectively provided with a first limit plate and a second limit plate. The top two sides of the first limit plate are provided with a first return spring. The side wall of the filter box is provided with multiple second return springs.

[0018] As a further description of the above technical solution:

[0019] The pressure rod and the abutment rod are arranged vertically, with the bottom inclined surface of the pressure rod abutting the end inclined surface of the abutment rod, and both are slidably connected inside the filter box. The end of the abutment rod away from the inclined surface is located at the top of the side slider.

[0020] As a further description of the above technical solution:

[0021] One end of each of the two reset springs is fixedly connected to one side of the limiting plate, and the other end of each reset spring is fixedly connected to the inside of the side wall of the filter box.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, three filter plates are set in the filter box, and a cleaning brush is set in one of the filter plates. The filter plate is hollow inside. By sliding the cleaning brush, the filter plate can be effectively cleaned to ensure the filtration efficiency.

[0024] 2. In this utility model, side sliders are provided on both sides of the filter plate and slide in the side sliding grooves opened in the side wall of the filter box. After the filter plate is installed, the sealing cover can be sealed. The pressure rod located in the side wall is subjected to the downward pressure of the sealing cover and can slide inward to act on the inclined surface of the push rod, so that the push rod is finally stuck on the top of the side slider, thus fixing the filter plate. When the sealing cover is opened for internal cleaning, the push rod retracts into the side wall under the action of multiple return springs, and the filter plate can be easily removed. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of the air intake filter structure of a screw vacuum pump proposed in this utility model;

[0026] Figure 2 This is a schematic diagram of the insert block of the air intake filter structure of a screw vacuum pump proposed in this utility model;

[0027] Figure 3 This is a schematic diagram of the cleaning brush plate of the air intake filter structure of a screw vacuum pump proposed in this utility model;

[0028] Figure 4 This is a schematic diagram of the side slider of the air intake filter structure of a screw vacuum pump proposed in this utility model;

[0029] Figure 5 This is a schematic diagram of the retaining rod of the air intake filter structure of a screw vacuum pump proposed in this utility model.

[0030] Legend:

[0031] 1. Filter box; 2. Inlet pipe; 3. Outlet pipe; 4. Flange; 5. Sealing cover; 6. Insert block; 7. Inner groove; 8. Filter plate; 9. Polyester fiber board; 10. Cleaning brush plate; 11. Side slider; 12. Side sliding groove; 13. Pressure rod; 14. Limiting plate one; 15. Return spring one; 16. Support rod; 17. Limiting plate two; 18. Return spring two. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Reference Figure 1 - Figure 5 This utility model provides an embodiment of an air intake filtration structure for a screw vacuum pump, comprising a filter box 1 primarily used to house and support internal components. A removable sealing cover 5 is installed at the top opening of the filter box 1 to provide airtight sealing during equipment operation and to be opened when maintenance is required. An air inlet pipe 2 is fixedly connected to one side wall of the filter box 1 to guide gas containing impurities into the box, while an air outlet pipe 3 is fixedly connected to the other side to deliver filtered clean gas to the screw vacuum pump.

[0034] Both the inlet pipe 2 and the outlet pipe 3 are fitted with standard flanges 4 at their ends furthest from the housing. In this embodiment, three identical filter plates 8 are arranged side-by-side inside the filter housing 1. Gas must pass through these filter plates 8 sequentially to reach the outlet pipe 3. At least one filter plate 8 has a polyester fiber plate 9 installed inside as the core filter medium to intercept fine particles and dust in the gas. A through groove is formed inside another filter plate 8, and a cleaning brush 10 is slidably connected within this groove. The bottom of the cleaning brush 10 is also slidably supported on the inner bottom wall of the filter housing 1 to ensure stable reciprocating motion. When cleaning the filter plate 8 is required, the operator does not need to disassemble the filter plate 8; they only need to drag the cleaning brush 10 back and forth. The bristles on the brush effectively scrape and clean the dust adhering to the inner channel wall of the filter plate 8, causing the detached impurities to settle to the bottom of the filter housing 1, thereby quickly restoring the filtration channel to its unobstructed state and ensuring the continuous and efficient operation of the filtration system.

[0035] Each filter plate 8 has a side slider 11 fixedly connected to both sides. Correspondingly, a matching side sliding groove 12 is opened on the inner side wall of the filter box 1. During installation, simply align the side slider 11 of the filter plate 8 with the side sliding groove 12 and push it in to complete the positioning. To further improve the overall stability of the filter box 1, multiple inserts 6 are also provided around its bottom. These inserts 6 are precisely inserted into the preset inner grooves 7 on the side wall of the filter box 1 during installation. After the filter plate 8 is fully slid into the designated position, the sealing cover 5 is closed and pressed tightly. The downward pressing action of the sealing cover 5 acts on the vertically arranged pressure rod 13 in the snap-fit ​​assembly, causing it to overcome the elastic force of the return spring 15 and slide downward. The bottom of the pressure rod 13 is designed with an inclined surface, which abuts against the inclined surface of the end of the vertically arranged abutment rod 16 below it. The downward force of the pressure rod 13 is converted into a horizontal thrust on the abutment rod 16 through the inclined plane. This causes the abutment rod 16 to overcome the tension of multiple return springs 18 and extend from inside the side wall. The end of the abutment rod away from the inclined plane moves to the top of the side slider 11, thus firmly holding the side slider 11 in place and locking the filter plate 8. Conversely, when the filter plate 8 needs to be removed for replacement or deep cleaning, simply open the sealing cover 5. The pressure applied to the pressure rod 13 disappears, and under the action of the return spring 15 below the limiting plate 14, the pressure rod 13 automatically returns to its original position and rises. At the same time, under the pull of the return spring 18 connected to the limiting plate 17, the abutment rod 16 also automatically retracts into the side wall, releasing the lock on the side slider 11. At this point, the filter plate 8 can be easily pulled out along the side slide groove 12. The entire process requires no additional tools and is extremely simple to operate.

[0036] Working principle: Gas containing impurities first enters the interior of filter box 1 through inlet pipe 2, and then passes through three filter plates 8 arranged side by side. A polyester fiber board 9 installed inside one of the filter plates 8 filters the gas. The filtered gas is finally discharged through outlet pipe 3. The flanges 4 on inlet pipe 2 and outlet pipe 3 are used to connect to external piping systems and vacuum pumps. During operation, the interior of filter plate 8 is cleaned by reciprocating the sliding cleaning brush 10 inside one of the filter plates. During installation, the filter plate 8 slides into the side sliding grooves 12 on the side wall of filter box 1 via side sliders 11 on both sides, while the insert block 6 at the bottom of filter box 1 is inserted into the inner groove 7 of the side wall. When the sealing cover 5 is closed and pressed down, its pressure is transmitted to the vertical pressure rod 13. The pressure rod 13 slides downward against the elastic force of the return spring 15, and the inclined surface at its bottom pushes the inclined surface of the perpendicular abutment rod 16, so that the abutment rod 16 overcomes the tension of the return spring 18 connected to the limit plate 17 and extends horizontally until one end of it is stuck on the top of the side slider 11. When the sealing cover 5 is opened, the pressure rod 13 rebounds and rises under the action of the return spring 15, and the abutment rod 16 retracts under the action of the return spring 18, releasing the abutment relationship with the side slider 11. At this time, the filter plate 8 can be taken out along the side slide groove 12.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A gas inlet filtering structure of a screw vacuum pump, comprising a filtering box (1), characterized in that: The top of the filter box (1) is fitted with a sealing cover (5). An air inlet pipe (2) is fixedly connected to one side of the filter box (1), and an air outlet pipe (3) is fixedly connected to the other side of the filter box (1). Three filter plates (8) are arranged side by side inside the filter box (1). One of the filter plates (8) is fitted with a cleaning brush plate (10), and another filter plate (8) is fitted with a polyester fiber plate (9). Side sliders (11) are fixedly connected to both sides of the filter plates (8). Multiple snap-fit ​​components are provided on the side wall of the filter box (1). The snap-fit ​​components are used to fix and install the side sliders (11).

2. The gas inlet filtering structure of a screw vacuum pump according to claim 1, characterized in that: The filter plate (8) has a through groove inside, and the cleaning brush plate (10) is slidably connected inside the filter plate (8), and the bottom of the cleaning brush plate (10) is slidably connected to the inner bottom wall of the filter box (1).

3. The gas inlet filtering structure of a screw vacuum pump according to claim 1, characterized in that: The filter box (1) has multiple inner grooves (7) on its side wall, and the filter box (1) has inserts (6) around its bottom. The inserts (6) are inserted into the inner grooves (7).

4. The gas inlet filtering structure of a screw vacuum pump according to claim 1, characterized in that: The filter box (1) has a side sliding groove (12) on its side wall, and the side slider (11) is slidably connected inside the side sliding groove (12).

5. The gas inlet filtering structure of a screw vacuum pump according to claim 1, characterized in that: Flanges (4) are installed on opposite sides of the air inlet pipe (2) and the air outlet pipe (3).

6. The gas inlet filtering structure of a screw vacuum pump according to claim 1, characterized in that: The snap-fit ​​assembly includes a pressure rod (13) and a stop rod (16). The middle part of the pressure rod (13) and the stop rod (16) is respectively provided with a first limit plate (14) and a second limit plate (17). The top two sides of the first limit plate (14) are provided with a first return spring (15). Multiple second return springs (18) are provided inside the side wall of the filter box (1).

7. The air inlet filter structure of a screw vacuum pump according to claim 6, characterized in that: The pressure rod (13) and the abutment rod (16) are arranged vertically. The bottom slope of the pressure rod (13) abuts against the end slope of the abutment rod (16), and both are slidably connected inside the filter box (1). The end of the abutment rod (16) away from the slope is located at the top of the side slider (11).

8. The gas inlet filtering structure of a screw vacuum pump according to claim 7, characterized in that: One end of each of the two reset springs (18) is fixedly connected to one side of the limiting plate (17), and the other end of the two reset springs (18) is fixedly connected to the inside of the side wall of the filter box (1).

Images