Exhaust filter for vacuum pump

Abstract

The exhaust filter for the vacuum pump comprises a shell and a plurality of filter elements located in the shell, the filter elements are transversely installed in the shell, a supporting plate used for bearing oil liquid is arranged under each filter element, and all the filter elements are vertically installed in the shell in multiple rows and multiple columns in a multi-layer column mode; the length of the filter element is greater than the outer diameter of the end surface of the filter element, so that the filter element is slender; the filter element is transversely and obliquely arranged in the shell, and the supporting plate is also transversely and obliquely arranged in the shell. According to the exhaust filter for the vacuum pump, the supporting plate located under the filter elements receives oil flowing out of the filter elements, the problem that backflow of the oil in the upper-layer filter elements affects the lower-layer filter elements is solved, the situation that the oil affects normal work of the lower-layer filter elements is avoided, meanwhile, vertical multi-layer column installation of the small-sized filter elements is achieved through the arrangement of the supporting plate, the space utilization rate is increased, and the service life is prolonged. The filter area is larger, the filter efficiency is improved, and the filter effect is good.

Description

Technical Field

[0001] The present invention belongs to the technical field of vacuum pumps and relates to an exhaust filter for a vacuum pump. Background Art

[0002] When a vacuum pump operates, lubricating oil is used. The lubricating oil can not only increase the lubricating effect but also have a sealing function, which plays a key role in improving the vacuum degree of the vacuum pump. However, as the temperature of the vacuum pump rises and the vacuum pump continues to operate, the lubricating oil will continuously vaporize and liquefy in small amounts, generating oil fumes and oil liquids. The oil fumes and oil liquids are discharged mixed in the exhaust gas of the vacuum pump, thus polluting the indoor air. In the prior art, filters are usually provided to filter substances such as oil liquids and oil fumes. These substances are either too small in particle size or have no fixed shape, so the filtering form is not mainly by blocking but mainly by adsorption; and the amount that can be adsorbed in the filter element is certain. The more oil liquid remains in the filter element, the smaller the effective filtering area of the filter element. The filters in the prior art usually adopt single-cylindrical filter elements. For example, in the patent with the application number "201520764750.6" and the name "Filter Element at the Exhaust Port of a Vacuum Pump", the large size of the single-cylindrical filter element results in weak strength, easy overpressure damage, and at the same time increases the oil liquid travel in the filter element, which is not conducive to the discharge of the oil liquid; at the same time, the filtering area of the single-cylindrical filter element is limited, the load per unit area of the filter element is large, and the filtering effect and filtering efficiency are poor. Summary of the Invention

[0003] The purpose of the present invention is to provide an exhaust filter for a vacuum pump that increases the filtering area of the filter element in view of the above problems existing in the prior art.

[0004] The purpose of the present invention can be achieved by the following technical solutions: An exhaust filter for a vacuum pump includes a housing and a plurality of filter elements located inside the housing. The filter elements are horizontally installed inside the housing, and a tray for receiving the oil liquid is provided directly below each filter element. All the filter elements are vertically and multi-layered in several rows and several columns inside the housing.

[0005] In the above exhaust filter for a vacuum pump, the length of the filter element is greater than the outer diameter of the end face of the filter element, so that the filter element is slender.

[0006] In the above exhaust filter for a vacuum pump, the filter element is horizontally arranged and inclinedly installed inside the housing, and the tray is also horizontally and inclinedly installed inside the housing.

[0007] In the above exhaust filter for a vacuum pump, a first mounting plate and a second mounting plate are respectively provided at two ends of the housing. Both ends of the support plate are respectively fixed to the first mounting plate and the second mounting plate by fasteners. A number of first through holes are formed in the first mounting plate, and a number of second through holes are formed in the second mounting plate. An air inlet pipe cap is provided in the first through hole. One end of the filter element is installed in the first through hole through the air inlet pipe cap. A first sealing ring is sleeved on the air inlet pipe cap. The inner hole diameter of the air inlet pipe cap is ≥ the inner hole diameter of the filter element. A tail end pipe cap is provided in the second through hole. The other end of the filter element is installed in the second through hole through the tail end pipe cap. A mounting nut is fixed on the tail end pipe cap, and an overflow valve is threadedly installed on the mounting nut. A through hole communicating with the overflow valve is formed in the tail end pipe cap.

[0008] In the above exhaust filter for a vacuum pump, the overflow valve includes a valve body, a valve plate, a gasket, a snap ring, and a first spring. An installation cavity is provided in the valve body. A number of air flow through holes communicating with the installation cavity are formed in the valve body. A first installation step and a second installation step are respectively provided at two ends of the installation cavity. The gasket, the valve plate, and the first spring are all movably located in the installation cavity. The gasket and the valve plate are connected in an "I" shape. Two ends of the first spring respectively abut against the first installation step and the valve plate, and at the same time make the gasket contact the second installation step. A positioning flange is formed on the valve plate, and a snap ring groove is formed at the end of the valve body. The snap ring is snapped into the snap ring groove. The outer diameter width of the positioning flange is greater than the inner diameter width of the snap ring.

[0009] In the above exhaust filter for a vacuum pump, a gland is further provided at the end of the overflow valve. The gland is fixed on the second mounting plate. A second spring is sleeved on the mounting nut. Two ends of the second spring respectively contact the gland and the mounting nut. An air outlet is formed at the bottom of the gland. The air outlet communicates with the installation cavity and the air flow through holes on the overflow valve.

[0010] In the above exhaust filter for a vacuum pump, a total of twelve filter elements are provided, and the twelve filter elements are arranged in three rows and four columns in the housing.

[0011] Compared with the prior art, the support plate located directly below the filter element in the exhaust filter for the vacuum pump receives the oil flowing out of the filter element, solves the problem that the oil reflux in the upper filter element affects the lower filter element, avoids the oil affecting the normal operation of the lower filter element, enables the filter element to be installed and used in a vertical alignment, improves the effectiveness of the vertical multi-layer filter element design, reduces the lateral distance between the filter elements, greatly increases the number of filter elements that can be installed, and avoids the contact between the filter element reflux oil and the airflow, and prevents the oil from being secondary smeared; at the same time, the setting of the support plate realizes the vertical multi-layer installation of miniaturized filter elements, improves space utilization, and has a larger filtering area, improves filtering efficiency, and has a good filtering effect; at the same time, the small-diameter filter element has higher strength, so that the filter element can withstand a large internal and external pressure difference, which is conducive to improving the filtering effect and extending the service life of the filter element; the small-diameter filter element is light in weight and easy to install and replace; the two ends of the filter element are installed through the intake pipe cap and the tail pipe cap respectively, so that each filter element can be individually disassembled and installed horizontally, and the defective filter element in the multi-layer filter element installation structure can be individually replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the cross-sectional structure of the exhaust filter for the vacuum pump.

[0013] Figure 2 It is another schematic diagram of the cross-sectional structure of the exhaust filter for the vacuum pump.

[0014] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0015] Figure 4 It is a schematic diagram of the explosion structure of the exhaust filter for the vacuum pump.

[0016] Figure 5 It is a three-dimensional structural diagram of the exhaust filter for the vacuum pump after the exhaust filter and the air intake cover are hidden.

[0017] Figure 6 This is a schematic diagram of the three-dimensional structure of the exhaust filter for the vacuum pump behind the hidden base.

[0018] Figure 7 It is a schematic diagram of the arrangement structure of a multi-layer filter element in the prior art.

[0019] Figure 8 It is a schematic diagram of the cross-sectional structure of a floating valve in a closed state in an exhaust filter for a vacuum pump.

[0020] Figure 9 It is a schematic diagram of the cross-sectional structure of the floating valve in the exhaust filter for the vacuum pump in the open state.

[0021] In the figure, 1 is the housing; 101 is the exhaust port; 102 is the horizontal baffle; 103 is the edge guard; 104 is the diversion notch; 105 is the housing groove; 106 is the first partition; 107 is the water inlet; 108 is the water outlet; 109 is the heat dissipation rib; 110 is the oil return hole; 111 is the sewage discharge hole; 112 is the second partition; 2 is the separator; 21 is the oil storage tank; 22 is the floating valve; 221 is the floating valve body; 222 is the float; 223 is the second sealing ring; 224 is the sealing plug; 225 is the connecting part; 226 is the pin shaft; 227 is the sealing surface; 228 is the through hole; 229 is the hexagonal hole; 3 is the filter element; 31 is the intake pipe cap; 32 is the tail end pipe cap; 33 is the first sealing ring; 34 is the overflow valve; 341 is the valve body; 342 is the valve plate; 343 is the gasket; 344 is the circlip; 345 is the first spring; 346 is the air flow through hole; 347 is the positioning flange; 35 is the gland; 351 is the air outlet; 36 is the second spring; 37 is the mounting nut; 4 is the support plate; 5 is the first mounting plate; 6 is the second mounting plate; 7 is the mounting cover plate; 8 is the intake cover plate; 81 is the intake port; 82 is the vertical baffle; 83 is the ventilation hole; 9 is the base; 91 is the oil sump. Detailed implementation manners

[0022] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0023] As Figure 1-9 shown, this exhaust filter for a vacuum pump includes a housing 1 and a plurality of filter elements 3 located inside the housing 1. An installation cover plate 7 and an intake cover plate 8 are respectively provided at both ends of the housing 1. An intake port 81 is made on the intake cover plate 8, and an exhaust port 101 is made on the top surface of the housing 1. A separator 2 is provided inside the housing 1, and the separator 2 divides the housing 1 into an upper cavity and a lower cavity. The filter elements 3 are horizontally installed inside the housing 1, and a support plate 4 for receiving oil is provided directly below each filter element 3. All the filter elements 3 are vertically and multi-layered and arranged in several rows and several columns in the upper cavity. In the prior art, the upper and lower layers of the multi-layer filter elements are stagger-mounted and cannot be vertically aligned, and at most only two layers can be arranged; otherwise, as Figure 7 shown in the three-layer arrangement in, the oil discharged from the uppermost filter element will drip onto the lowermost filter element, affecting the filtering effect of the lowermost filter element. Seriously, the lowermost filter element will not be able to work. In the present invention, the support plate 4 located directly below the filter element 3 receives the oil flowing out of the filter element 3, solves the problem that the oil in the upper filter element flows back and affects the lower filter element, avoids the oil affecting the normal operation of the lower filter element 3 below, enables the filter element 3 to be vertically aligned and used, improves the utility of the vertical multi-layer filter element design, reduces the horizontal distance between the filter elements 3, and greatly increases the number of filter elements 3 that can be arranged; at the same time, it avoids the contact between the oil flowing back from the filter element 3 and the air flow, and prevents the oil from being re-entrained. There are a total of twelve filter elements 3 in this application, and the twelve filter elements 3 are arranged in three rows and four columns in the upper cavity.

[0024] In the above technical solution: The length of the filter element 3 is much greater than the outer diameter of the end face of the filter element 3, making the filter element 3 slender. At the same time, the setting of the support plate 4 realizes the vertical multi-layer installation of the miniaturized filter element 3. Under the same installation size, the small-diameter filter element 3 after vertical multi-layer installation has a longer circumference, that is, a larger filtration area, compared with the existing large-diameter filter element, improving the space utilization rate. At the same time, the total material consumption of the small-diameter filter element 3 is more and the strength is higher, enabling the filter element 3 to withstand a larger internal and external pressure difference, which is beneficial to improving the filtration effect and extending the service life of the filter element 3. The oil in the filter element stays due to the adsorption of the filter element. The oil will occupy the adsorption area of the filter element. Assuming that the filtration effect of the filter element is uniform, then the average formation of the oil adsorbed during filtration in the filter element should be 1 / 4 of the circumference. The oil in the large-diameter filter element in the prior art has a long travel distance and a long time, and the amount of oil retained in the filter element is large. Correspondingly, the occupancy rate of the effective adsorption area of the filter element is high, and the filtration effect of the filter element drops significantly; the oil in the small-diameter filter element has a short travel distance, the time for the oil in the filter element 3 to drain is short, the amount of oil retained in the filter element is small, and the occupancy rate of the effective adsorption area of the filter element is low, and the filtration effect of the filter element does not drop significantly, which is beneficial to improving the filtration efficiency. The small-diameter filter element 3 is light in weight, facilitating installation and replacement.

[0025] In the above technical solution: As Figure 2 shown, the filter element 3 is horizontally and obliquely installed in the upper cavity, and the support plate 4 is also horizontally and obliquely installed in the upper cavity. The horizontal installation of the filter element 3 can reduce the travel distance of the oil in the filter element 3 and the amount of oil retained in the filter element 3, which is beneficial to the drainage of the oil in the filter element 3 and maintaining the filtration effect of the filter element 3. The inclined installation of the filter element 3 can make the oil on the inner hole surface of the filter element 3 flow downward and drain out of the filter element 3, avoiding the accumulation of liquid on the inner hole surface of the filter element 3, which is beneficial to increasing the effective filtration area of the filter element 3, improving the filtration effect, and extending the service life of the filter element 3. The horizontally and obliquely installed support plate 4 can divert the oil to the side wall of the housing 1, avoiding the oil from spilling onto the surface of the lower-layer filter element and reducing the contact between the oil and the air flow, preventing the oil from being re-entrained by the air flow.

[0026] In the above technical scheme: a first mounting plate 5 and a second mounting plate 6 are respectively provided at both ends of the upper cavity. The two ends of the support plate 4 are respectively fixed to the first mounting plate 5 and the second mounting plate 6 by fasteners. The support plate 4 can be used as a slideway when the filter element 3 is installed, so that the filter element 3 can be accurately installed even without a field of vision. A plurality of first through holes are formed on the first mounting plate 5, and a plurality of second through holes are formed on the second mounting plate 6. An air intake cap 31 is provided in the first through hole, and one end of the filter element 3 is installed in the first through hole through the air intake cap 31, and a first sealing ring 33 is sleeved on the air intake cap 31. The inner diameter of the air intake cap 31 is ≥ the inner diameter of the filter element 3, which is conducive to the discharge of oil in the filter element 3 and avoids liquid accumulation. A tail end cap 32 is provided in the second through hole, and the other end of the filter element 3 is installed in the second through hole through the tail end cap 32. The two ends of the filter element 3 are respectively installed through the air inlet pipe cap 31 and the tail end pipe cap 32, so that each filter element 3 can be individually disassembled and assembled horizontally, so as to realize the individual replacement of the defective filter element in the multi-layer filter element 3 array structure.

[0027] In the above technical solution: a mounting nut 37 is fixed on the tail end pipe cap 32, a relief valve 34 is threadedly mounted on the mounting nut 37, and a through hole connected to the relief valve 34 is formed on the tail end pipe cap 32. The relief valve 34 is installed at the tail end of the filter element 3, and automatically opens when the pressure in the filter element 3 exceeds the standard, so as to avoid the filter element 3 from being damaged by overpressure. The size of the internal and external pressure difference of the filter element 3 when working is an important basis for judging whether the filter element 3 is normal. The working pressure of the relief valve 34 is uniform, and the working state of the relief valve 34 can be used as a sign to judge whether the filter element 3 is abnormal, which is convenient for the inspection and maintenance of the filter element 3. The relief valve 34 can adopt standard parts on the market, provide a standard judgment basis, and facilitate the inspection and replacement of the relief valve 34.

[0028] In the above technical solution: the overflow valve 34 includes a valve body 341, a valve plate 342, a sealing gasket 343, a retaining spring 344, and a first spring 345. An installation cavity is provided in the valve body 341, and a plurality of air flow holes 346 communicating with the installation cavity are formed on the valve body 341, and a first installation step and a second installation step are respectively provided at both ends of the installation cavity. The sealing gasket 343, the valve plate 342, and the first spring 345 are all movably located in the installation cavity, and the sealing gasket 343 and the valve plate 342 are connected in an I-shaped manner. The two ends of the first spring 345 are respectively in contact with the first installation step and the valve plate 342, and the sealing gasket 343 is in contact with the second installation step. A positioning flange 347 is formed on the valve disc 342, and a retaining ring groove is formed at the end of the valve body 341. The retaining ring 344 is inserted into the retaining ring groove. The outer diameter width of the positioning flange 347 is greater than the inner diameter width of the retaining ring 344. The retaining ring 344 limits the movement of the valve disc 342 to prevent the valve disc 342 from separating from the valve body 341. The end surface of the positioning flange 347 cooperates with the side wall of the installation cavity to guide the movement of the valve disc 342 in the valve body 341 to ensure that the valve disc 342 moves correctly.

[0029] In the above technical solution: A gland 35 is also provided at the end of the overflow valve 34. The gland 35 is fixed on the second mounting plate 6. A second spring 36 is sleeved on the mounting nut 37. Two ends of the second spring 36 are respectively in contact with the gland 35 and the mounting nut 37. An air outlet 351 is formed at the bottom of the gland 35. The air outlet 351 is communicated with the mounting cavity and the air flow through hole 346 on the overflow valve 34. When the oil fluid overflows from the end of the filter element 3, the oil fluid flows out of the gland 35 through the opened overflow valve 34 and the air outlet 351. Due to the blocking effect of the gland 35, the external oil fluid cannot enter the gland 35. Thus, whether the filter element 3 corresponding to the gland 35 is abnormal can be judged by observing the oil stain condition on the inner side of the gland 35 and the end cap 32 at the tail end.

[0030] In the above technical solution: As Figure 2 shown, the partition plate 2 serves as the bottom surface of the upper cavity. The partition plate 2 is transversely inclined, and the lowest part of the partition plate 2 is recessed to form a semi-circular oil storage groove 21. A floating valve 22 is arranged in the oil storage groove 21. The floating valve 22 can automatically adjust the valve opening according to the oil fluid height, and can effectively control the liquid accumulation in the upper cavity of the filter. By means of the inclined partition plate 2, the oil fluid at the bottom of the upper cavity quickly converges into the oil storage groove 21, and then the liquid level change of the oil storage groove 21 is used to control the oil storage amount in the upper cavity. The cross-sectional area of the oil storage groove 21 is different from that of the bottom surface of the upper cavity, which amplifies the oil level change caused by the oil amount change in the upper cavity, thereby improving the effect of the floating valve 22 in controlling the oil storage amount in the upper cavity. The floating valve 22 can be directly purchased from the market. The floating valve 22 provided in this technical solution includes a floating valve body 221 and a float 222. A through hole 228 is formed on the floating valve body 221. A second sealing ring 223 for sealing between the floating valve body 221 and the oil storage groove 21 is sleeved on the floating valve body 221. A sealing plug 224 is arranged on the float 222. The sealing plug 224 is threadedly installed on the float 222. The end surface of the sealing plug 224 exposes the float 222 and serves as a sealing surface 227. A connecting portion 225 is arranged on the side surface of the floating valve body 221. The float 222 is hinged on the connecting portion 225 through a pin shaft 226. The float 222 can rotate relative to the floating valve body 221. When the sealing surface 227 is close to the end of the through hole 228, the floating valve 22 is in a closed state, as Figure 8 shown; when the sealing surface 227 is separated from the through hole 228, the floating valve 22 is in an opened state, as Figure 9As shown in the figure. The floating valve 22 provided by this technical solution utilizes the lever principle to amplify the effects of the buoyancy and gravity of the float, improving the reliability of the valve operation; it also utilizes the principle of the crank and connecting rod. When the valve opens and closes, there is no relative sliding distance on the sealing surface 227 of the sealing plug 224, avoiding friction damage to the sealing surface 227 and improving the reliability of the valve. The sealing surface 227 is provided with a hexagonal hole 229. After the floating valve 22 is installed, the installation degree of the sealing plug 224 can be adjusted with an internal hexagonal wrench on the outside, thereby adjusting the in-place state of the valve and ensuring the sealing effect when the valve is closed.

[0031] In the above technical solution: The end of the air intake cover plate 8 is provided with a vertical baffle 82, and the bottom of the vertical baffle 82 is provided with a ventilation hole 83. The air intake 81 is located above the ventilation hole 83, and the ventilation hole 83 is located below the partition plate 2 and the upper cavity. The end of the partition plate 2 protrudes from the side of the upper cavity and forms a horizontal baffle 102. The height of the horizontal baffle 102 is higher than the bottom surface height of the vertical baffle 82, that is, the horizontal baffle 102 is located above the ventilation hole 83. The exhaust air flow enters the air intake cover plate 8 through the air intake 81. The vertical baffle 82 can prevent the exhaust air flow from directly impacting the filter element 3 and avoid the vibration of the filter element 3; at the same time, the vertical baffle 82 can buffer and adsorb the exhaust air flow, reducing the oil content in the exhaust air flow and reducing the working burden of the filter element 3. The exhaust air flow then enters the housing 1 through the ventilation hole 83. The horizontal baffle 102 reduces the exhaust air flow flowing directly upward, making the exhaust air flow contact the lower cavity and improving the buffering effect of the lower cavity.

[0032] In the above technical solution: The end of the horizontal baffle 102 is bent upward to form a baffle edge 103, and diversion notches 104 are provided at both ends of the baffle edge 103. The oil liquid flowing back flows through the horizontal baffle 102 and is blocked by the baffle edge 103. The oil liquid accumulated on the horizontal baffle 102 flows out through the diversion notches 104 and flows back along the inner wall of the housing 1, avoiding secondary entrainment of the exhaust air flow.

[0033] In the above technical solution: One end of the housing 1 close to the air intake cover plate 8 is an open end. The bottom surface of the lower cavity is inclined, and the low position part of the bottom surface of the lower cavity is located at the open end, so as to facilitate the cleaning and sewage discharge of the lower cavity; at the same time, it increases the oil liquid depth at the bottom of the open end of the housing 1 to ensure the buffering effect. The lower cavity mainly provides a longitudinal buffering distance for the exhaust. Utilizing the characteristic of the large density of the liquid, after there is a buffering space, it is difficult for the liquid in the exhaust air flow to obtain sufficient force to change its movement direction from horizontal movement to vertical upward movement, and at the same time, the liquid is kept away from the rising exhaust air flow, thereby reducing the oil liquid entrainment in the exhaust air flow and being beneficial to reducing the filtering load of the filter element 3.

[0034] In the above technical solution: A housing groove 105 is formed at the bottom of the housing 1, and the top surface of the housing groove 105 is inclined. A base 9 is fixed to the bottom of the housing 1, and the bottom of the housing 1 and the base 9 are sealed by a sealing ring, so that the housing groove 105 forms a sealed interlayer. An inlet 107 and an outlet 108 communicating with the interlayer are formed on the housing 1. As Figure 6 shown, a plurality of first partitions 106 and a plurality of second partitions 112 are respectively provided on the opposite side walls of the housing groove 105. The first partitions 106 and the second partitions 112 are arranged along a direction perpendicular to the inclined direction of the top surface of the housing groove 105. The first partitions 106 and the second partitions 112 are parallel to each other and are evenly arranged in the housing groove 105. There are flow gaps between the ends of the first partitions 106, the ends of the second partitions 112 and the groove walls of the housing groove 105. The first partitions 106 and the second partitions 112 are arranged in a relatively crossed manner. The first partitions 106 and the second partitions 112 form a curved flow path in the interlayer into which water is introduced, avoiding local stagnant water and increasing the heat exchange area at the same time. The top surface of the housing groove 105 is inclined, that is, the top surface of the water interlayer is inclined. The first partitions 106 and the second partitions 112 are arranged along a direction perpendicular to the inclined direction of the top surface of the housing groove 105, so that all the gas in the interlayer can be discharged, avoiding local air bubbling at the top of the water interlayer, and effectively ensuring the heat dissipation effect of the top surface of the interlayer. The height of the outlet 108 is higher than the height of the inlet 107. Water enters at a low position and exits at a high position, avoiding air residue at the top of the flow path and ensuring the effective heat dissipation area of the flow path. The flow path can be used for cooling or heating the oil. When removing condensable gases, in order to avoid gas condensation from contaminating the working oil, the oil usually needs to be heated.

[0035] In the above technical solution: A plurality of heat dissipation ribs 109 are provided in the lower cavity. The heat dissipation ribs 109 increase the heat exchange area and improve the cooling or heating efficiency; at the same time, the heat dissipation ribs 109 play a role in dividing the air flow. Utilizing the weight and viscosity of the liquid, the heat dissipation ribs 109 increase the contact times with the oil in the air flow, reduce the impact force of the air flow, and increase the collision times and contact area with the air flow. Utilizing the relatively rough surface of the heat dissipation rib 109 casting, the kinetic energy of the oil in the air flow is quickly reduced, improving the capture effect on the oil contained in the exhaust air flow, thereby improving the oil filtration effect and being beneficial to reducing oil and gas emissions. The heat dissipation ribs 109 are arranged perpendicular to the opening end face of the housing 1, facilitating the cleaning of the lower cavity of the housing 1; the direction of the heat dissipation ribs 109 is consistent with the air flow direction, which can reduce the exhaust pressure loss.

[0036] In the above technical solution: the side of the lower cavity is provided with an oil return hole 110 and a drain hole 111, and the vacuum pump sucks oil from the oil pool at the bottom of the lower cavity through the oil return hole 110. The height of the oil return hole 110 is higher than the bottom surface of the lower cavity, and a buffer oil pool can be formed at the bottom of the lower cavity, reducing the impact of the exhaust airflow, and enhancing the capture and adsorption effect of the oil in the airflow, reducing the filtering load of the filter element, which is conducive to reducing oil and gas emissions.

[0037] In the above technical solution, four oil collecting grooves 91 are formed on the base 9, and the oil collecting grooves 91 prevent the oil from flowing out, so as to keep the surrounding land clean.

[0038] The working process of the exhaust filter for the vacuum pump is as follows: oil and oil smoke enter through the air inlet 81 and are blocked by the vertical baffle 82, and enter the shell 1 through the vent hole 83 at the bottom of the vertical baffle 82; by utilizing the weight and viscosity of the liquid and the blocking of the horizontal baffle 102, the oil and oil smoke first enter the lower cavity and contact with the heat dissipation ribs 109 for buffering, and are cooled or heated by the water flow channel in the shell groove 105; then the oil smoke enters the upper cavity and is adsorbed by the filter element 3 for filtration, and finally discharged from the exhaust port 101.

[0039] The support plate 4 located directly below the filter element 3 in the exhaust filter for the vacuum pump receives the oil flowing out of the filter element 3, solves the problem that the oil reflux in the upper filter element affects the lower filter element, avoids the oil affecting the normal operation of the lower filter element 3, enables the filter element 3 to be installed and used in a vertical alignment, improves the effectiveness of the vertical multi-layer filter element design, reduces the lateral distance between the filter elements 3, greatly increases the number of filter elements 3 that can be installed, and avoids the contact between the reflux oil of the filter element 3 and the airflow, preventing the oil from being carried away by the second time; at the same time, the setting of the support plate 4 realizes a miniaturized filter element The vertical multi-layer arrangement of 3 improves space utilization, has a larger filtering area, improves filtering efficiency, and has a good filtering effect; at the same time, the small-diameter filter element 3 has higher strength, so that the filter element 3 can withstand a larger internal and external pressure difference, which is beneficial to improving the filtering effect and extending the service life of the filter element 3; the small-diameter filter element 3 is light in weight and easy to install and replace; the two ends of the filter element 3 are respectively installed through the intake pipe cap 31 and the tail end pipe cap 32, so that each filter element 3 can be individually disassembled and assembled horizontally, so as to realize the individual replacement of the defective filter element in the multi-layer filter element 3 arrangement structure.

[0040] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0041] Although the terms such as housing 1; exhaust port 101; horizontal baffle 102; edge stop 103; diversion notch 104; housing groove 105; first partition 106; water inlet 107; water outlet 108; heat dissipation rib 109; oil return hole 110; sewage discharge hole 111; second partition 112; separator 2; oil storage tank 21; floating valve 22; floating valve body 221; float 222; second sealing ring 223; sealing plug 224; connecting part 225; pin shaft 226; sealing surface 227; through hole 228; hexagonal hole 229; filter element 3; air inlet cap 31; tail end cap 32; first sealing ring 33; overflow valve 34; valve body 341; valve plate 342; gasket 343; circlip 344; first spring 345; air flow through hole 346; positioning flange 347; gland 35; air outlet 351; second spring 36; mounting nut 37; support plate 4; first mounting plate 5; second mounting plate 6; mounting cover plate 7; air inlet cover plate 8; air inlet 81; vertical baffle 82; ventilation hole 83; base 9; oil sump 91 are used more frequently in this article, the possibility of using other terms is not excluded. These terms are only used to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

[0042] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art. The specific embodiments described herein are only illustrative examples of the spirit of the present invention. Those skilled in the technical field to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An exhaust filter for a vacuum pump, comprising a housing (1) and a plurality of filter elements (3) located within the housing (1), characterized in that The filter element (3) is horizontally installed in the housing (1). A tray (4) for receiving oil is provided directly below each filter element (3). All the filter elements (3) are vertically and multi-layered in several rows and columns in the housing (1).

2. The exhaust filter for a vacuum pump according to claim 1, characterized in that The length of the filter element (3) is greater than the outer diameter of the end face of the filter element (3), making the filter element (3) slender.

3. The exhaust filter for a vacuum pump according to claim 1, characterized in that The filter element (3) is horizontally and obliquely installed in the housing (1), and the tray (4) is also horizontally and obliquely installed in the housing (1).

4. The exhaust filter for a vacuum pump according to claim 1, characterized in that First mounting plates (5) and second mounting plates (6) are respectively provided at both ends of the housing (1). Both ends of the tray (4) are respectively fixed to the first mounting plate (5) and the second mounting plate (6) by fasteners. A number of first through holes are formed in the first mounting plate (5), and a number of second through holes are formed in the second mounting plate (6). An air inlet pipe cap (31) is provided in the first through hole. One end of the filter element (3) is installed in the first through hole through the air inlet pipe cap (31). A first sealing ring (33) is sleeved on the air inlet pipe cap (31). The inner hole diameter of the air inlet pipe cap (31) is ≥ the inner hole diameter of the filter element (3). A tail-end pipe cap (32) is provided in the second through hole. The other end of the filter element (3) is installed in the second through hole through the tail-end pipe cap (32). A mounting nut (37) is fixed on the tail-end pipe cap (32). An overflow valve (34) is threadedly installed on the mounting nut (37). A through hole communicating with the overflow valve (34) is formed in the tail-end pipe cap (32).

5. The exhaust filter for a vacuum pump according to claim 4, characterized in that The overflow valve (34) includes a valve body (341), a valve plate (342), a gasket (343), a snap ring (344), and a first spring (345). An installation cavity is provided in the valve body (341). A number of air flow through holes (346) communicating with the installation cavity are formed in the valve body (341). A first installation step and a second installation step are respectively provided at both ends of the installation cavity. The gasket (343), the valve plate (342), and the first spring (345) are all movably located in the installation cavity. The gasket (343) and the valve plate (342) are connected in an I-shape. Both ends of the first spring (345) respectively abut against the first installation step and the valve plate (342), and at the same time make the gasket (343) contact the second installation step. A positioning flange (347) is formed on the valve plate (342). A snap ring groove is formed at the end of the valve body (341). The snap ring (344) is snapped into the snap ring groove. The outer diameter width of the positioning flange (347) is greater than the inner diameter width of the snap ring (344).

6. The exhaust filter for a vacuum pump according to claim 5, characterized in that The end of the overflow valve (34) is also provided with a gland (35), the gland (35) is fixed on the second mounting plate (6), a second spring (36) is sleeved on the mounting nut (37), and two ends of the second spring (36) are respectively in contact with the gland (35) and the mounting nut (37). An air outlet (351) is formed at the bottom of the gland (35), and the air outlet (351) is communicated with the mounting cavity on the overflow valve (34) and the air flow through hole (346).

7. The exhaust filter for a vacuum pump according to claim 1, characterized in that There are a total of twelve filter elements (3), and the twelve filter elements (3) are arranged in three rows and four columns in the housing (1).

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