Oil injection prevention trap for vacuum pump

Abstract

The utility model discloses an oil blowout prevention trap for a vacuum pump, which comprises a housing and a base, the lower end of the base is provided with a connector for connecting the vacuum pump, and the upper end of the base is provided with an exhaust port for exhausting gas. A filter screen and filter paper are vertically stacked in the base, and the distance between the upper end of the filter screen and the exhaust port of the base is larger than 10 mm; the cover shell covers the exhaust port of the base, an exhaust gap for communicating the exhaust port with the outside is formed between the cover shell and the base, a plurality of abutting parts for abutting against the filter screen extend downwards in the cover shell, the abutting parts are evenly arranged around the center of the base, and an exhaust notch is formed between every two abutting parts. An internal core plate is omitted, and the distance between the filter screen and the exhaust port is increased; meanwhile, uniform and dispersed pressure is applied to the filter screen and the filter paper through the multiple abutting parts which are uniformly distributed on the circumference, stress is uniform, local deformation and displacement are not prone to occurring, and filtering is more reliable.

Description

TECHNICAL FIELD

[0001] The utility model relates to a vacuum pump accessory technical field especially relates to a kind of oil spray catcher for vacuum pump. BACKGROUND

[0002] As widely used vacuum obtaining equipment in industrial field, oil seal rotary vane vacuum pump will form oil mist particles with particle size range of 0.1-5 μm under the shearing action of high-speed rotating rotary vane and airflow carrying. These tiny oil mists will cause multiple problems if directly discharged without effective treatment: first, it will cause continuous loss of lubricating oil, increasing equipment maintenance cost;Second, it will pollute the working environment, and may cause product pollution in industries with high cleanliness requirements such as electronics and pharmaceuticals;More seriously, long-term inhalation of oil mist may cause respiratory diseases and other occupational health problems in operating personnel.

[0003] Therefore, an oil mist catcher is usually added at the vacuum pump oil tank for interception and filtration. The conventional oil mist catcher includes a cover shell and a base, the lower end of the base is connected to the vacuum pump, the inside of the base is sequentially provided from bottom to top with a core plate structure and filter material, and the cover shell compresses and limits the center of the filter material. Due to the height limitation of the core plate structure of the catcher, the spacing between the filter material and the exhaust port is very limited. When the filtered oil droplets accumulate on the surface of the filter material, the oil droplets are very easy to be carried by the airflow and sprayed out of the exhaust port, causing splashing problem. SUMMARY

[0004] The technical problem to be solved by the utility model is to overcome the above problems, and provide an oil spray prevention catcher for vacuum pump, to avoid oil droplet splashing problem, improve the reliability of oil mist filtration and interception, prevent vacuum pump oil from flowing out of the vacuum pump to pollute the working environment, and reduce waste.

[0005] The technical solution of the utility model is:

[0006] The oil spray prevention catcher for vacuum pump includes a cover shell and a base, the lower end of the base is provided with a connecting port for connecting the vacuum pump, and the upper end is provided with an exhaust port for discharging gas, characterized in that: a filter screen and filter paper are stacked inside the base, and the distance between the upper end of the filter screen and the exhaust port of the base is greater than 10 mm; the cover shell covers the exhaust port of the base, and the cover shell and the base form an exhaust gap between the exhaust port and the outside; a plurality of pressure resisting parts are downwardly extended in the cover shell for resisting the filter screen, the plurality of pressure resisting parts are uniformly arranged around the center of the base, and an exhaust gap is formed between every two pressure resisting parts.

[0007] This invention eliminates the core plate structure of the filter, allowing the filter screen and filter paper structure to be moved downwards. This increases the distance between the filter screen and the exhaust port at the top of the filter without increasing the overall size, preventing oil droplets accumulated on the filter paper and filter screen inside the filter from splashing outside the filter. At the same time, multiple pressure points evenly distributed around the circumference of the casing provide uniform pressure to all parts of the filter screen and filter paper, ensuring uniform force on the filter screen and filter paper and avoiding localized deformation.

[0008] Furthermore, in the vacuum pump anti-spraying oil trap described in this utility model, the base is provided with a positioning step surface for supporting the filter paper. The base also has a support ring connected to the positioning step surface via circumferentially distributed spokes. The support ring and spokes jointly support the lower end of the filter paper. In this structure, the positioning step surface ensures accurate filter paper installation, with the filter paper edge positioned on the positioning step surface. Simultaneously, the spoke-type central support structure forms distributed support, preventing the middle of the filter paper from collapsing, reducing weight while maintaining support strength.

[0009] Furthermore, in the vacuum pump anti-spraying filter described in this utility model, the lower end of the pressing part has a protrusion that can be inserted into the filter screen mesh. The smaller protrusion design provides a certain margin for housing assembly, avoiding assembly failure due to machining errors, effectively compensating for machining tolerances in parts such as the pressing part, and ensuring smooth assembly within the dimensional deviation range.

[0010] Furthermore, in the vacuum pump anti-spraying oil catcher of this utility model, the pressing part is integrally formed with the cover, which facilitates processing and forming.

[0011] Furthermore, in the vacuum pump anti-spraying oil catcher of this utility model, the distance between the upper edge of the exhaust notch and the upper end face of the inner wall of the casing is not less than 12mm, so as to avoid the "thin and easily broken" structure of the pressure part due to the exhaust notch being too large, and at the same time to form a sufficiently high anti-splash barrier, thus doubly preventing oil droplets from overflowing.

[0012] Furthermore, in the vacuum pump anti-spraying oil catcher of this utility model, there are no fewer than four pressure-blocking parts.

[0013] Furthermore, in the vacuum pump anti-spraying oil catcher of this utility model, the cover is provided with multiple sliding grooves at intervals around its inner peripheral wall, and the base is provided with multiple sliders on its outer peripheral wall; each slider is recessed with a limiting groove, and a limiting block is provided in the sliding groove. The slider is slidably disposed in the sliding groove, and is limited by the engagement of the limiting block and the limiting groove. The sliding groove guides the assembly accuracy of both parts, and the engaging structure ensures proper assembly and prevents loosening during use.

[0014] The beneficial effects of this utility model are:

[0015] 1. This utility model eliminates the traditional core plate structure of the filter, moves the filter screen and filter paper structure downward, increases the distance between the filter screen and the exhaust port, extends the smooth diffusion path of the airflow, and avoids the high-speed airflow carrying oil droplets on the filter paper and filter screen directly spraying out, effectively reducing oil spraying.

[0016] 2. This utility model uses multiple circumferentially distributed pressing parts to press and limit the filter screen and filter paper, and applies pressure evenly to avoid excessive local stress caused by single-point central pressing, effectively preventing filter screen deformation or local collapse, and extending service life; and the pressing effect is better and it is not easy to shift. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the present invention.

[0018] Figure 2 This is a schematic diagram of the casing structure described in the utility model.

[0019] Figure 3 This is a schematic diagram of the base structure described in the utility model. Detailed Implementation

[0020] The present invention will now be further described with reference to the accompanying drawings:

[0021] Reference Figure 1 , Figure 2 and Figure 3 As shown in this embodiment, a vacuum pump anti-spraying oil trap includes a housing 1 and a base 2. The base 2 has a connection port for connecting to a vacuum pump at its lower end and an exhaust port 3 for discharging gas at its upper end. A filter screen 5 and filter paper 4 are stacked vertically inside the base 2, with the upper end of the filter screen 5 being more than 10mm away from the exhaust port 3 of the base 2. The housing 1 covers the exhaust port 3 of the base, and an exhaust gap is formed between the housing 1 and the base 2, connecting the exhaust port 3 to the outside. At least four pressing parts 6 extend downwards inside the housing 1 to press against the filter screen. These pressing parts 6 are evenly arranged around the center of the base 2. The pressing parts 6 are integrally formed with the housing 1, and the lower end of each pressing part 6 has a protrusion 7 that can be inserted into the mesh of the filter screen 5. An exhaust notch 8 is formed between each pair of pressing parts 6, and the distance between the upper edge of the exhaust notch 8 and the upper surface of the inner wall of the housing 1 is not less than 12mm.

[0022] The base 2 has a positioning step surface 9 for supporting the filter paper 4. The base 2 also has a support ring 10 connected to the positioning step surface 9 via circumferentially distributed spokes 11. The support ring 10 and spokes 11 together support the lower end of the filter paper 4. The positioning step surface 4 supports the edge of the filter paper 4, while the support ring 10 and spokes 11 work together to support the center of the filter paper 4, resulting in a stable structure and preventing deformation under pressure.

[0023] The cover 1 has multiple sliding grooves 13 spaced around its inner peripheral wall, and the base 2 has multiple sliders 12 correspondingly arranged on its outer peripheral wall; the sliders 12 have a recessed limiting groove 15, and the sliding groove 13 has a corresponding limiting block 14. The sliders 12 are slidably arranged in the sliding groove 13 and are limited by the engagement of the limiting block 14 with the limiting groove 15, which facilitates disassembly and maintenance.

[0024] The base 2 is connected to the vacuum pump oil tank. Gas enters through the connection and passes sequentially through filter paper 4 and filter screen 5, effectively intercepting and filtering oil mist and droplets. The outer portion of the gas flows directly upwards to the exhaust port 3, while the gas in the central area flows through the exhaust notch 8 to the exhaust port 3, then enters the exhaust gap between the housing 2 and the base 1 and is discharged outside the collector. This structure increases the distance between the filter structure and the exhaust port 3 to achieve a splash-proof design, effectively reducing the risk of oil carrying in the airflow. Simultaneously, multiple pressure-resistant parts 6 effectively prevent displacement of the filter screen 5 and filter paper 4, providing a good clamping effect and ensuring filtration uniformity and reliability.

[0025] The specific embodiments described herein are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model are still covered by the claims of this utility model.

Claims

1. An oil mist separator for a vacuum pump, comprising a cover and a base, the base being provided at a lower end with a connection port for connecting to a vacuum pump and at an upper end with a gas discharge port, characterized in that: The filter screen and filter paper are stacked in the base in an up-down manner, and the upper end of the filter screen is more than 10 mm away from the exhaust port of the base; the cover is arranged on the exhaust port of the base, and the cover and the base form an exhaust gap for connecting the exhaust port and the outside; a plurality of pressing parts for pressing on the filter screen are downwardly extended in the cover, the plurality of pressing parts are evenly arranged around the center of the base, and an exhaust gap is formed between every two pressing parts.

2. The blow-by oil trap for vacuum pumps according to claim 1, characterized in that: A positioning step surface for supporting the filter paper is arranged in the base, and a support ring is further arranged in the base and connected to the positioning step surface through the radially distributed spokes, and the support ring and the spokes jointly support the lower end of the filter paper.

3. The blow-by oil trap for vacuum pumps according to claim 1, characterized in that: The lower end of the pressing part has a protrusion which can be inserted into the mesh of the filter screen.

4. The blow-by oil trap for vacuum pumps according to claim 1 or 3, characterized in that: The pressing part is integrally formed with the cover.

5. The blow-by oil trap for a vacuum pump according to claim 1, characterized by: The distance between the upper edge of the exhaust gap and the upper end surface of the inner wall of the cover is not less than 12 mm.

6. The blow-by oil trap for vacuum pumps according to claim 1, characterized in that: The number of the pressing parts is not less than four.

7. The blow-by oil trap for vacuum pumps according to claim 1, characterized in that: A plurality of sliding grooves are arranged in the cover around the inner circumferential wall, and a plurality of sliding blocks are correspondingly arranged on the outer circumferential wall of the base; a limiting clamping groove is concavely arranged on the sliding block, and a limiting clamping block is correspondingly arranged in the sliding groove; the sliding block is slidingly arranged in the sliding groove and is limited by the clamping of the limiting clamping block and the limiting clamping groove.

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