Air inlet filtering device of screw vacuum pump

Abstract

The utility model relates to the technical field of screw vacuum pump inlet air filtering, in particular to a screw vacuum pump inlet air filtering device which comprises a filtering cylinder. An air inlet pipe is arranged at the inner bottom of the filter cylinder in a penetrating mode, a threaded groove meshed with the inner side of the inner threaded lantern ring is formed in the outer side of the bottom end of the fixed ventilation cylinder, first ventilation holes are evenly distributed in the side bottom end of the fixed ventilation cylinder, and second ventilation holes are evenly distributed in the side wall of the middle fixing frame; third vent holes are uniformly distributed in the side wall of the inner sleeve, air flow enters the top end of the fixed vent cylinder after entering the filter cylinder through the air inlet pipe, air is filtered by water in the filter cylinder when entering the filter cylinder from the first vent holes, and the air enters the middle fixed frame through the second vent holes when moving to the top end of the filter cylinder; compared with a traditional screw vacuum pump air inlet filtering device, the screw vacuum pump air inlet filtering device has the advantages that the filtering effect is better, and the screw vacuum pump air inlet filtering device is more convenient to use.

Description

Technical Field

[0001] The utility model relates to the technical field of air intake filtration for screw vacuum pumps, in particular to an air intake filtration device for a screw vacuum pump. Background Art

[0002] A screw vacuum pump is an exhaust device that uses a pair of intermeshing screws to rotate synchronously at high speed in opposite directions in the pump casing to produce suction and exhaust effects. The screw vacuum pump will suck impurities in the air into the pump body when taking in air. In order to prevent impurities from affecting the service life of the vacuum pump, a filter device will be installed at the air inlet of the pump body.

[0003] A patent with announcement number CN 218530201 U discloses an air intake filter device for a screw vacuum pump, the air intake filter device for the screw vacuum pump comprises a shell, an air intake net is inlaid on the outside of the mounting cylinder, a rotatably connected reciprocating screw is arranged inside the mounting cylinder, a threaded connecting rod is sleeved on the outer wall of the reciprocating screw, a top plate is arranged on the side of the connecting rod close to the air intake net, and a plurality of ejectors are arranged on the outer wall of the top plate, the air intake net is cleaned by ejecting blocked particles and floating floccules in the air intake net, thereby greatly reducing the blockage of the air intake filter device during use, thereby reducing the impact on the air extraction efficiency of the vacuum pump.

[0004] However, when the ejector pin of the existing screw vacuum pump filter device is inserted into the through hole of the air inlet net during use, the air inlet net will be blocked, which will affect the air intake effect of the vacuum pump, and the impurities on the air inlet net will be easily brought into the outer shell when the ejector pin retracts, resulting in poor filtering effect and easy damage to the vacuum pump. Therefore, a screw vacuum pump air intake filter device is proposed to address the above problems. Utility Model Content

[0005] In order to make up for the deficiencies of the prior art and address the problems existing in the prior art, the utility model proposes an air intake filter device for a screw vacuum pump.

[0006] The technical solution adopted by the utility model to solve its technical problems is: the utility model describes an air intake filter device for a screw vacuum pump, comprising a filter cartridge; an air intake pipe is provided through the inner bottom of the filter cartridge, an internal threaded ring is installed at the inner bottom of the filter cartridge, and a fixed air-permeable cylinder is provided on the inner side of the internal threaded ring, a threaded groove that engages with the inner side of the internal threaded ring is provided on the outer side of the bottom end of the fixed air-permeable cylinder, the fixed air-permeable cylinder is located in the internal threaded ring, and is sleeved on the outer side of the air intake pipe, a first air hole is evenly distributed on the side bottom end of the fixed air-permeable cylinder, an opening is provided at the top of the filter cartridge, a middle fixed frame is provided in the opening, a second air hole is evenly distributed on the side wall of the middle fixed frame, a filter element is provided in the middle fixed frame, a second flange is installed on the outer side of the upper opening of the middle fixed frame, and a filter element is provided in the middle fixed frame. A No. 1 flange is installed on the outer side of the opening, a cavity is arranged in the filter element, an inner sleeve is arranged in the cavity, three air holes are evenly distributed on the side wall of the inner sleeve, an opening is arranged on the upper part of the inner sleeve, a cover plate is installed on the opening, an air outlet pipe is installed on the cover plate, and the air outlet pipe passes through the cover plate and is communicated with the inner sleeve, a liquid inlet pipe and a liquid outlet pipe are respectively installed on the side walls of the filter cartridge, and the liquid inlet pipe is located directly above the liquid outlet pipe, an observation window is arranged on the side wall of the filter cartridge, holes are penetrated through the No. 1 flange, the No. 2 flange and the cover plate, fixing screws are also penetrated through the holes, a nut is arranged on the threaded end of the fixing screw, and the nut is located below the No. 1 flange, so as to achieve the effect of multiple filtering. Compared with the traditional screw vacuum pump intake filter device, the filtering effect is better and the use is more convenient.

[0007] Preferably, the center lines of the filter cylinder, air inlet pipe, internal threaded ring, and fixed air cylinder all coincide with each other, and the top opening of the air inlet pipe is located at the top of the fixed air cylinder, which cooperates to achieve the effect of gas refinement filtration and improve the filtration effect.

[0008] Preferably, a marking line is provided on the inner wall of the filter cartridge, the center lines of the middle fixing frame, filter element and inner sleeve coincide with each other, and the No. 1 flange, No. 2 flange and cover plate are parallel to each other, so as to achieve the function of fixing the device and facilitate the cleaning of the pointer.

[0009] Preferably, the other end of the air outlet pipe is provided with a No. 4 flange in an inverted U shape, and sealing plugs are provided in the openings of the liquid inlet pipe and the liquid outlet pipe, so as to achieve a sealing effect.

[0010] Preferably, a one-way valve is installed on the air inlet pipe, and the one-way valve is located below the filter cartridge, so as to prevent the water in the filter cartridge from backflowing and being discharged from the bottom end of the air inlet pipe.

[0011] Preferably, the threaded end of the fixing screw is simultaneously and sequentially penetrated into the holes of the cover plate, the second flange and the first flange, and sealing gaskets are arranged between the cover plate, the second flange and the first flange, which cooperate to achieve a sealing effect and ensure the filtering effect.

[0012] The utility model is beneficial in that:

[0013] 1. In the utility model, the airflow will enter the filter cartridge from the bottom of the air inlet pipe under the operation of the vacuum pump. When the airflow enters the filter cartridge through the air inlet pipe, it will enter the top of the fixed air-permeable cartridge. When the gas enters the filter cartridge from the No. 1 air hole, it will be filtered by the water in the filter cartridge. When the gas moves to the top of the filter cartridge, it will enter the middle fixed frame through the No. 2 air hole, and then will be filtered again by the filter element, and then enter the inner sleeve through the No. 3 air hole. The combination achieves the effect of multiple filtration. Compared with the traditional screw vacuum pump air intake filter device, the filtering effect is better and the use is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 is a schematic diagram of a first three-dimensional structure;

[0016] Figure 2 It is a cutaway and enlarged schematic diagram of the main structure of the filter component;

[0017] Figure 3 It is a cutaway and enlarged schematic diagram of the main structure of the filter cartridge assembly;

[0018] Figure 4 It is an enlarged schematic diagram of area A in the cutaway diagram of the main structure of the filter cartridge assembly;

[0019] Figure 5 It is a cutaway and enlarged schematic diagram of the main structure of the secondary filter element assembly;

[0020] Figure 6 It is an enlarged schematic diagram of the main structure of the inner sleeve assembly.

[0021] In the figure: 1. filter cartridge; 2. air inlet pipe; 3. internal threaded collar; 4. fixed air vent cylinder; 5. No. 1 air vent; 6. marking line; 7. middle fixed frame; 8. No. 2 air vent; 9. filter element; 10. No. 1 flange; 11. No. 2 flange; 12. inner sleeve; 13. No. 3 air vent; 14. cover plate; 15. air outlet pipe; 16. No. 4 flange; 17. liquid inlet pipe; 18. liquid outlet pipe; 19. sealing plug; 20. observation window; 21. one-way valve; 22. fixing screw; 23. nut. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-6As shown, a screw vacuum pump air intake filter device comprises a filter cartridge 1; an air intake pipe 2 is provided through the inner bottom of the filter cartridge 1, an internal threaded collar 3 is installed on the inner bottom of the filter cartridge 1, and a fixed air-permeable cylinder 4 is provided on the inner side of the internal threaded collar 3, a threaded groove engaging with the inner side of the internal threaded collar 3 is provided on the outer side of the bottom end of the fixed air-permeable cylinder 4, the fixed air-permeable cylinder 4 is located in the internal threaded collar 3, and is sleeved on the outer side of the air intake pipe 2, a number 1 air vent 5 is evenly distributed on the side bottom end of the fixed air-permeable cylinder 4, an opening is provided on the top of the filter cartridge 1, a middle fixed frame 7 is provided in the opening, and the side wall of the middle fixed frame 7 is evenly distributed with air vents 5. The cloth is provided with No. 2 air holes 8, a filter element 9 is provided in the middle fixed frame 7, a No. 2 flange 11 is installed on the outer side of the upper opening of the middle fixed frame 7, a No. 1 flange 10 is installed on the outer side of the upper opening of the filter cartridge 1, a cavity is provided in the filter element 9, an inner sleeve 12 is provided in the cavity, and No. 3 air holes 13 are evenly distributed on the side wall of the inner sleeve 12, an opening is provided on the upper part of the inner sleeve 12, a cover plate 14 is installed on the opening, an air outlet pipe 15 is installed on the cover plate 14, and the air outlet pipe 15 passes through the cover plate 14 and communicates with the inner sleeve 12, and the side walls of the filter cartridge 1 are respectively provided with a liquid inlet pipe 17 and a liquid outlet pipe 18, and the liquid inlet pipe 17 is located just above the liquid outlet pipe 18, an observation window 20 is provided on the side wall of the filter cartridge 1, the No. 1 flange 10, the No. 2 flange 11, and the cover plate 14 are all penetrated with holes, and a fixing screw 22 is also penetrated in the hole, and a nut 23 is provided at the threaded end of the fixing screw 22, and the nut 23 is located below the No. 1 flange 10, the center lines of the filter cartridge 1, the air inlet pipe 2, the internal threaded collar 3, and the fixed air-permeable cylinder 4 are all coincident, the top opening of the air inlet pipe 2 is located at the top of the fixed air-permeable cylinder 4, and a marking line 6 is provided on the inner wall of the filter cartridge 1, the middle fixed frame 7, the filter element 9. The center lines of the inner sleeve 12 are all coincident, the No. 1 flange 10, the No. 2 flange 11 and the cover plate 14 are parallel to each other, the other end of the outlet pipe 15 is provided with a No. 4 flange 16 in an inverted U shape, the openings of the liquid inlet pipe 17 and the liquid outlet pipe 18 are both provided with sealing plugs 19, a one-way valve 21 is installed on the inlet pipe 2, and the one-way valve 21 is located below the filter cartridge 1, the threaded end of the fixing screw 22 is simultaneously and sequentially penetrated through the holes of the cover plate 14, the No. 2 flange 11 and the No. 1 flange 10, and sealing gaskets are provided between the cover plate 14, the No. 2 flange 11 and the No. 1 flange 10.

[0024] During operation, since the existing screw vacuum pump filter device will block the air inlet net when the ejector pin is inserted into the through hole of the air inlet net during use, the air inlet effect of the vacuum pump will be affected at this time, and the impurities on the air inlet net are easily brought into the outer shell when the ejector pin retracts, resulting in poor filtering effect and easy damage to the vacuum pump. In this solution, the device is installed and connected to the air inlet of the screw vacuum pump through the fourth flange 16, and the fixed air-permeable cylinder 4 is screwed into the internal threaded collar 3 through the threaded groove at the bottom end thereof, the middle fixed frame 7 is placed in the filter cylinder 1, and then the filter element 9 is placed in the middle fixed frame 7, and the middle fixed frame 7 and the filter cylinder 1 are installed under the cover plate 14. During installation, the inner sleeve 12 is set in the filter element 9, and then the fixed air-permeable cylinder 4 is screwed into the internal threaded collar 3 through the threaded groove at the bottom end thereof, and the middle fixed frame 7 is placed in the filter cylinder 1, and then the filter element 9 is placed in the middle fixed frame 7. The middle fixed frame 7 and the filter cylinder 1 are installed under the cover plate 14. During installation, the inner sleeve 12 is set in the filter element 9, and then the fixed air-permeable cylinder 4 is screwed into the internal threaded collar 3 through the threaded groove at the bottom end thereof, and then the fixed air-permeable cylinder 4 is screwed into the internal threaded collar 3 ... The threaded end of the fixed screw 22 passes through the threaded holes provided in the cover plate 14, the second flange 11 and the first flange 10 in turn, and then the nut 23 is fastened to the threaded end of the fixed screw 22, thereby fixing the middle fixed frame 7 in the filter cartridge 1, and fixing the filter cartridge 1 under the cover plate 14, and then opening the liquid inlet pipe 17 to pour water into the filter cartridge 1, but not exceeding the marking line 6, and closing the liquid inlet pipe 17. At this time, when the vacuum pump is running, it will inhale air through the air outlet pipe 15, the filter cartridge 1 and the air inlet pipe 2 in turn. Under the operation of the vacuum pump, the air flow will enter the filter cartridge 1 from the bottom end of the air inlet pipe 2, and the top end of the air inlet pipe 2 is located in the fixed air vent tube 4, and a No. 1 air vent 5 is provided at the bottom of the fixed air vent tube 4. When the air flow enters through the air inlet pipe 2 After entering the filter cartridge 1, it will enter the top of the fixed air-permeable cylinder 4, and under the continuous operation of the vacuum pump, the gas at the top of the fixed air-permeable cylinder 4 will move from the top to the bottom, and be discharged from the No. 1 air hole 5 on the side of the fixed air-permeable cylinder 4, and the bottom of the filter cartridge 1 is filled with water. When the gas enters the filter cartridge 1 from the No. 1 air hole 5, it will be filtered by the water in the filter cartridge 1, and when the airflow is discharged from the No. 1 air hole 5 evenly arranged on the side of the fixed air-permeable cylinder 4, it will be subdivided into small bubbles, thereby improving the filtering effect of the gas discharged from the No. 1 air hole 5 into the bottom water of the filter cartridge 1, and when the gas enters the filter cartridge 1, it will be transported upward again, and when the gas moves to the top of the filter cartridge 1, it will enter the middle fixed frame 7 through the No. 2 air hole 8. The liquid will then be filtered again by the filter element 9, and then enter the inner sleeve 12 through the No. 3 air vent 13, and finally enter the air outlet pipe 15 to be transported to the air inlet of the vacuum pump connected to the No. 4 flange 16, thereby achieving the effect of multi-stage filtration. When there are too many impurities in the filtered water in the filter cartridge 1, the sewage in the filter cartridge 1 can be discharged by opening the liquid outlet pipe 18, and the nut 23 can be unscrewed to remove the fixing screw 22 from the holes opened in the cover plate 14, the No. 2 flange 11, and the No. 1 flange 10, and the filter cartridge 1 can be removed from under the cover plate 14, and then the filter element 9 and the filter cartridge 1 can be cleaned, and the effect of multiple filtration is achieved by cooperation. Compared with the traditional screw vacuum pump intake filter device, the filtering effect is better and the use is more convenient.

[0025] Working principle: the device is connected to the air inlet of the screw vacuum pump through the No. 4 flange 16, the fixed air-permeable cylinder 4 is screwed into the internal threaded collar 3 through the threaded groove at the bottom end, the middle fixed frame 7 is placed in the filter cartridge 1, and then the filter element 9 is placed in the middle fixed frame 7, and the middle fixed frame 7 and the filter cartridge 1 are installed under the cover 14. During installation, the inner sleeve 12 is set in the filter element 9, and then the threaded end of the fixing screw 22 is used to pass through the threaded holes opened in the cover 14, the No. 2 flange 11 and the No. 1 flange 10 in sequence, and then the nut 23 is tightened on the threaded end of the fixing screw 22, so as to fix the middle fixed frame 7 on the filter cartridge 1, and the filter cartridge 1 is fixed under the cover plate 14, then the liquid inlet pipe 17 is opened to pour water into the filter cartridge 1, but not exceeding the mark line 6, and the liquid inlet pipe 17 is closed. At this time, when the vacuum pump is running, it will suck air through the outlet pipe 15, the filter cartridge 1 and the inlet pipe 2 in sequence. The airflow will enter the filter cartridge 1 from the bottom end of the inlet pipe 2 under the operation of the vacuum pump, and the top end of the inlet pipe 2 is located in the fixed air-permeable cylinder 4, and a No. 1 air hole 5 is provided at the bottom of the side of the fixed air-permeable cylinder 4. When the airflow enters the filter cartridge 1 through the inlet pipe 2, it will enter the top end of the fixed air-permeable cylinder 4, and under the continuous operation of the vacuum pump, the gas at the top end of the fixed air-permeable cylinder 4 will move from the top end to the bottom end. And discharged from the No. 1 air hole 5 on the side of the fixed air-permeable cylinder 4, and the bottom of the filter cylinder 1 is filled with water. When the gas enters the filter cylinder 1 from the No. 1 air hole 5, it will be filtered by the water in the filter cylinder 1, and when the airflow is discharged from the No. 1 air hole 5 evenly arranged on the side of the fixed air-permeable cylinder 4, it will be subdivided into small bubbles, thereby improving the filtering effect of the gas discharged from the No. 1 air hole 5 into the bottom water of the filter cylinder 1, and when the gas enters the filter cylinder 1, it will be transported upward again. When the gas moves to the top of the filter cylinder 1, it will enter the middle fixed frame 7 through the No. 2 air hole 8, and then it will be filtered again by the filter element 9, and then enter through the No. 3 air hole 13 The filtered water flows into the inner sleeve 12 and finally enters the air outlet pipe 15 and is transported into the air inlet of the vacuum pump connected to the No. 4 flange 16, thereby achieving the effect of multi-stage filtration. When there are too many impurities in the filtered water in the filter cartridge 1, the sewage in the filter cartridge 1 can be discharged by opening the liquid outlet pipe 18, and the nut 23 is unscrewed to remove the fixing screw 22 from the holes opened in the cover plate 14, the No. 2 flange 11, and the No. 1 flange 10, and the filter cartridge 1 can be removed from under the cover plate 14, and then the filter element 9 and the filter cartridge 1 can be cleaned, and the effect of multiple filtration is achieved by cooperation. Compared with the traditional screw vacuum pump intake filter device, the filtering effect is better and the use is more convenient.

[0026] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A screw vacuum pump air intake filter device, characterized in that: The invention comprises a filter cartridge (1); an air inlet pipe (2) is provided through the bottom of the filter cartridge (1); an internal threaded collar (3) is installed on the bottom of the filter cartridge (1); a fixed air-permeable cartridge (4) is provided on the inner side of the internal threaded collar (3); a thread groove engaging with the inner side of the internal threaded collar (3) is provided on the outer side of the bottom end of the fixed air-permeable cartridge (4); the fixed air-permeable cartridge (4) is located inside the internal threaded collar (3) and is sleeved on the outer side of the air inlet pipe (2); a first air vent (5) is evenly distributed on the bottom side end of the fixed air-permeable cartridge (4); an opening is provided on the top of the filter cartridge (1); a middle fixed frame (7) is provided in the opening; second air vents (8) are evenly distributed on the side wall of the middle fixed frame (7); a filter element (9) is provided in the middle fixed frame (7); a second flange (11) is installed on the outer side of the upper opening of the middle fixed frame (7); and a first flange (10) is installed on the outer side of the upper opening of the filter cartridge (1). The filter element (9) is provided with a cavity, an inner sleeve (12) is provided in the cavity, three air holes (13) are evenly distributed on the side wall of the inner sleeve (12), an opening is provided on the upper part of the inner sleeve (12), a cover plate (14) is installed on the opening, an air outlet pipe (15) is installed on the cover plate (14), and the air outlet pipe (15) passes through the cover plate (14) and communicates with the inner sleeve (12), and the side walls of the filter cartridge (1) are respectively provided with liquid inlet pipes (1 7) and a liquid outlet pipe (18), and the liquid inlet pipe (17) is located directly above the liquid outlet pipe (18), an observation window (20) is provided on the side wall of the filter cartridge (1), the No. 1 flange (10), the No. 2 flange (11), and the cover plate (14) are all provided with holes, and a fixing screw (22) is also provided in the hole, a nut (23) is provided at the threaded end of the fixing screw (22), and the nut (23) is located below the No. 1 flange (10).

2. The air intake filter device for a screw vacuum pump according to claim 1, characterized in that: The center lines of the filter cartridge (1), the air inlet pipe (2), the internally threaded collar (3), and the fixed air-permeable cartridge (4) all coincide with each other, and the top opening of the air inlet pipe (2) is located at the top inner side of the fixed air-permeable cartridge (4).

3. The screw vacuum pump air intake filter device according to claim 1, characterized in that: A marking line (6) is provided on the inner wall of the filter cartridge (1); the center lines of the middle fixing frame (7), the filter element (9), and the inner sleeve (12) are all coincident; and the No. 1 flange (10), the No. 2 flange (11), and the cover plate (14) are parallel to each other.

4. The screw vacuum pump air intake filter device according to claim 1, characterized in that: The other end of the air outlet pipe (15) is provided with a No. 4 flange (16) in an inverted U shape, and sealing plugs (19) are provided in the openings of the liquid inlet pipe (17) and the liquid outlet pipe (18).

5. The screw vacuum pump air intake filter device according to claim 1, characterized in that: A one-way valve (21) is installed on the air inlet pipe (2), and the one-way valve (21) is located below the filter cartridge (1).

6. The screw vacuum pump air intake filter device according to claim 5, characterized in that: The threaded end of the fixing screw (22) is simultaneously and sequentially inserted into the holes of the cover plate (14), the second flange (11) and the first flange (10), and sealing gaskets are arranged between the cover plate (14), the second flange (11) and the first flange (10).

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