CN213286090U

CN213286090U - Pre-filter of vacuum pump

Info

Publication number: CN213286090U
Application number: CN202021109178.7U
Authority: CN
Inventors: 胡鹏; 陶昌建; 张达; 吴青云
Original assignee: Ningbo Aifake Vacuum Technology Research Institute Co ltd; Ningbo Aifake Machinery Manufacturing Co ltd
Current assignee: Ningbo Aifake Vacuum Technology Research Institute Co ltd; Ningbo Aifake Machinery Manufacturing Co ltd
Priority date: 2020-06-16
Filing date: 2020-06-16
Publication date: 2021-05-28
Anticipated expiration: 2030-06-16

Abstract

The utility model relates to the field of vacuum pumps, and discloses a vacuum pump pre-filter.A filter screen surface surrounding an exhaust port is arranged in a filter cavity, an upper end port of the filter screen surface is provided with an upper sealing cover, a lower end port of the filter screen surface is provided with a lower sealing cover, a through hole is arranged on the end surface of the lower sealing cover, and the through hole is arranged and communicated with the exhaust port; when the vacuum pump runs, the air inlet of the vacuum pump vacuumizes the external container through the filter cavity in the filter body; gas in the container to be pumped enters the filter cavity through the pumping hole to form gas flow, and large-particle impurities contained in the gas flow are screened by the filter screen surface, so that the gas flow entering the inner cavity of the filter screen surface is cleaner; the clean air flow flows directly down to the bottom of the filter chamber and through the exhaust port into the air inlet of the vacuum pump.

Description

Pre-filter of vacuum pump

Technical Field

The utility model relates to a vacuum pump field especially relates to vacuum pump preceding stage filter.

Background

The vacuum pump refers to a device or equipment for obtaining vacuum by pumping a pumped container by using a mechanical, physical, chemical or physicochemical method. The utility model discloses a publication is CN 208348062U's utility model discloses a doublestage gas cooling lobe pump, belong to one kind of vacuum pump, which comprises a base, the top fixed mounting of base has the lobe pump body, the air inlet has been seted up at the top of lobe pump body, the air inlet fixedly connected with intake pipe of the air inlet department at lobe pump body top, the gas outlet has been seted up to the surface of lobe pump body, the fixedly connected with outlet duct of gas outlet department of lobe pump body surface, one side fixed mounting of lobe pump body has the motor, the one end of motor shaft is connected with the main shaft through the shaft coupling transmission, the inside and the welding of the one end of main shaft extension to the lobe pump body have drive sprocket, drive sprocket's both sides are provided with actuating mechanism, thereby can be so that the rotor can be synchronous through setting up motor and actuating.

Above-mentioned lobe pump, its air inlet that sets up through the top is to being pumped the container and is bled, is applied to the pipeline evacuation usually, because there are steel slag, welding slag, large granule impurity such as metal fillings in the pipeline, at the evacuation in-process, above impurity can be inhaled to the pump body in, increases the pump body loss easily, arouses the pump body to damage even, consequently still has certain improvement space.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to prior art's shortcoming, provide a vacuum pump preceding stage filter, can guarantee that the air inlet of vacuum pump is bled smoothly, can reduce the volume that external large granule impurity got into the vacuum pump again.

In order to solve the technical problem, the utility model discloses a following technical scheme can solve:

a vacuum pump pre-stage filter comprises a filter body internally provided with a filter cavity, wherein an air suction port communicated with the filter cavity is formed in the outer side wall of the filter body, an air exhaust port communicated with the filter cavity is formed in the lower end face of the filter body, and the air exhaust port is fixed and communicated with an air inlet of a vacuum pump; the filter cavity is internally provided with a filter screen surface surrounding the exhaust port, the upper port of the filter screen surface is provided with an upper sealing cover, the lower port of the filter screen surface is provided with a lower sealing cover, the end surface of the lower sealing cover is provided with a through hole, and the through hole is installed and communicated with the exhaust port.

Preferably, the lower end face of the lower sealing cover is provided with an inner connecting ring which is annularly arranged on the through hole, the lower end face of the filter cavity is provided with an outer connecting ring which is annularly arranged on the exhaust port, and the outer wall of the inner connecting ring is in threaded connection with the inner wall of the outer connecting ring.

Preferably, the upper end surface of the outer connecting ring is annularly provided with a plurality of lubricating assemblies, and each lubricating assembly comprises a groove arranged on the upper end surface of the outer connecting ring and a graphite block arranged in the groove.

Preferably, a sliding cavity for the graphite block to slide longitudinally is arranged in the groove, a push plate is arranged at the tail end of the graphite block, and an elastic part abutted against the push plate is arranged at the bottom of the sliding cavity so that the push plate has a tendency of being close to the lower sealing cover.

Preferably, the elastic member is a compression spring, one end of the compression spring is abutted against the plate surface of the push plate, and the other end of the compression spring is abutted against the bottom of the sliding cavity.

Preferably, the sliding cavity is annularly provided with a limiting ring close to the inner wall of the port of the lower sealing cover.

Preferably, the upper end face of the upper cover is provided with a driving block, and the driving block is prism-shaped.

Preferably, a support rod is connected between the upper sealing cover and the lower sealing cover.

Preferably, the upper end of the filter body is provided with a sealing cap.

Preferably, the sealing cover is provided with a vacuum gauge mounting position.

The utility model discloses owing to adopted above technical scheme, have apparent technological effect: a pre-stage filter is arranged at an air inlet of the vacuum pump, and an air extraction opening at the filter body is used for externally connecting a container to be vacuumized; when the vacuum pump runs, the air inlet of the vacuum pump vacuumizes the external container through the filter cavity in the filter body; gas in the container to be pumped enters the filter cavity through the pumping hole to form gas flow, and large-particle impurities contained in the gas flow are screened by the filter screen surface, so that the gas flow entering the inner cavity of the filter screen surface is cleaner; the clean air flow directly flows downwards to the bottom of the filter cavity and enters an air inlet of the vacuum pump through an air outlet; can accomplish whole evacuation process, can effectively filter the large granule impurity in the middle of the evacuation gas again to extension vacuum pump life.

Drawings

FIG. 1 is a schematic structural diagram of the present embodiment;

fig. 2 is an enlarged schematic view of a portion a shown in fig. 1.

The names of the parts indicated by the numerical references in the above figures are as follows: 1. a filter chamber; 2. a filter body; 3. an air extraction opening; 4. an exhaust port; 5. a filter screen surface; 6. an upper sealing cover; 7. a lower sealing cover; 8. a through hole; 9. an inner connecting ring; 10. an outer connecting ring; 11. a lubrication assembly; 12. grooving; 13. graphite blocks; 14. a sliding cavity; 15. pushing the plate; 16. an elastic member; 17. a limiting ring; 18. a drive block; 19. a support bar; 20. a sealing cover; 21. a vacuum gauge mounting position; 22. a flange ring; 23. a bolt assembly.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 1 and fig. 2, the vacuum pump pre-filter disclosed in this embodiment includes a filter body 2 having a filter chamber 1 therein, the filter body 2 is vertically disposed, an air exhaust opening 3 communicated with the filter chamber 1 is disposed on an outer sidewall of the filter body 2, one or more air exhaust openings 3 are disposed, and a specific position can be adaptively adjusted according to user requirements. The lower end surface of the filter body 2 is provided with an exhaust port 4 communicated with the filter cavity 1, the exhaust port 4 is fixed and communicated with an air inlet of a vacuum pump (not shown), and the specific connection mode can be welding or flange connection, which belongs to common knowledge in the field and is not described herein. The filter cavity 1 is internally provided with a filter screen surface 5 surrounding the exhaust port 4, the upper port of the filter screen surface 5 is provided with an upper sealing cover 6, the lower port of the filter screen surface 5 is provided with a lower sealing cover 7, the end surface of the lower sealing cover 7 is provided with a through hole 8, the through hole 8 is preferably arranged at the central position of the lower sealing cover 7, and the through hole 8 is arranged and communicated with the exhaust port 4. A plurality of support rods 19 are connected between the upper sealing cover 6 and the lower sealing cover 7, and the plurality of support rods 19 are arranged along the circumferential direction of the filter screen surface 5. Each support rod 19 is arranged on the inner side of the filter screen surface 5 and is abutted against the inner wall of the filter screen surface 5, and meanwhile, each support rod 19 is arranged along the axial direction of the filter screen surface 5. The arrangement of the support rods 19 can ensure the filtering performance of the filter screen surface 5 and enhance the overall strength of the filter screen surface 5.

Further, a sealing cover 20 is provided at an upper end of the filter body 2, a flange ring 22 is provided at the upper end of the filter body 2, and the sealing cover 20 is connected to the flange ring 22 by a bolt assembly 23. So that the sealing cover 20 can be disassembled and assembled, and the user can conveniently overhaul the inside of the filter body 2. The sealing cover 20 is provided with a vacuum gauge mounting position 21 which can be used for mounting a vacuum gauge so as to facilitate a user to check the vacuum degree in the filter cavity 1 when the filter body 2 operates.

Furthermore, the lower end surface of the lower sealing cover 7 is provided with an inner connecting ring 9 which is annularly arranged on the through hole 8, the lower end surface of the filter cavity 1 is provided with an outer connecting ring 10 which is annularly arranged on the exhaust port 4, and the outer wall of the inner connecting ring 9 is in threaded connection with the inner wall of the outer connecting ring 10. Make the user can carry out the dismouting to filter screen face 5, the washing and the change of the filter screen face 5 of being convenient for, convenience of customers clears up the bottom of filter chamber 1 simultaneously, has increased the operation convenience.

Furthermore, the upper end surface of the upper cover 6 is provided with a driving block 18, and the driving block 18 is prism-shaped and is preferably arranged at the center of the upper cover 6, so that when a user mounts and detaches the filter screen surface 5, the user can rotate the driving block 18 by means of a wrench or other external tools to provide an acting point for the filter screen surface 5, thereby improving the convenience of mounting and detaching the filter screen surface 5.

Furthermore, the upper end surface of the outer connecting ring 10 is annularly provided with a plurality of lubricating assemblies 11, and the plurality of lubricating assemblies 11 are circumferentially arranged on the upper annular surface of the outer connecting ring 10. Each set of lubricating assemblies 11 comprises a slot 12 arranged on the upper end surface of the outer connecting ring 10 and a graphite block 13 arranged in the slot 12. A sliding cavity 14 for the graphite block 13 to slide longitudinally is arranged in the slot 12, the sliding cavity 14 is preferably vertical and cylindrical, and the graphite block 13 is also preferably cylindrical, so that the shapes of the two are matched with each other. The tail end of the graphite block 13 is provided with a push plate 15, the push plate 15 is preferably disc-shaped, and the outer wall of the push plate 15 abuts against the inner wall of the sliding cavity 14, so that the push plate 15 can stably slide in the sliding cavity 14. The bottom of the sliding chamber 14 is provided with an elastic element 16 abutting against the push plate 15 so that the push plate 15 has a tendency to approach the lower cover 7. In this embodiment, the elastic member 16 is a compression spring, one end of the compression spring abuts against the plate surface of the push plate 15, and the other end abuts against the bottom of the sliding cavity 14. The inner wall of the port of the sliding cavity 14 close to the lower sealing cover 7 is annularly provided with a limiting ring 17, the inner wall of the limiting ring 17 is abutted against the outer wall of the graphite block 13, so that the graphite block 13 can smoothly enter and exit the upper ring surface of the outer connecting ring 10, and the push plate 15 can be effectively prevented from separating from the sliding cavity 14. The arrangement of the graphite blocks 13 can increase the lubricating performance between the upper ring surface of the outer connecting ring 10 and the lower sealing cover 7, so that the filter screen surface 5 can be smoothly screwed on the outer connecting ring 10, and the operation convenience is improved. The push plate 15 is pushed by the elastic part 16, so that the graphite block 13 can be effectively driven to compensate the lower end surface of the lower sealing cover 7 in real time, and the lubricity between the upper ring surface of the outer connecting ring 10 and the lower sealing cover 7 is kept.

The specific working principle is as follows:

a pre-stage filter is arranged at an air inlet of the vacuum pump, and an air extraction opening 3 at the filter body 2 is used for externally connecting a container to be vacuumized; when the vacuum pump runs, the air inlet of the vacuum pump vacuumizes the external container through the filter cavity 1 in the filter body 2; gas in the container to be pumped enters the filter cavity 1 through the pumping hole 3 to form gas flow, and large-particle impurities contained in the gas flow are screened by the filter screen surface 5, so that the gas flow entering the inner cavity of the filter screen surface 5 is cleaner; the clean air flow directly flows downwards to the bottom of the filter cavity 1 and enters an air inlet of the vacuum pump through an air outlet 4; can accomplish whole evacuation process, can effectively filter the large granule impurity in the middle of the evacuation gas again to extension vacuum pump life.

Claims

1. A vacuum pump pre-filter, comprising: the vacuum pump comprises a filter body (2) internally provided with a filter cavity (1), wherein an air suction port (3) communicated with the filter cavity (1) is formed in the outer side wall of the filter body (2), an air exhaust port (4) communicated with the filter cavity (1) is formed in the lower end face of the filter body (2), and the air exhaust port (4) is fixed and communicated with an air inlet of a vacuum pump; a filter screen surface (5) surrounding the exhaust port (4) is arranged in the filter cavity (1), an upper sealing cover (6) is arranged at an upper port of the filter screen surface (5), a lower sealing cover (7) is arranged at a lower port of the filter screen surface (5), a through hole (8) is formed in the end face of the lower sealing cover (7), and the through hole (8) is installed and communicated with the exhaust port (4).

2. A vacuum pre-filter according to claim 1, wherein: the lower end face of the lower sealing cover (7) is provided with an inner connecting ring (9) which is annularly arranged on the through hole (8), the lower end face of the filter cavity (1) is provided with an outer connecting ring (10) which is annularly arranged on the exhaust port (4), and the outer wall of the inner connecting ring (9) is in threaded connection with the inner wall of the outer connecting ring (10).

3. A vacuum pre-filter according to claim 2, wherein: the upper end surface of the outer connecting ring (10) is annularly provided with a plurality of lubricating assemblies (11), and each lubricating assembly (11) comprises a groove (12) arranged on the upper end surface of the outer connecting ring (10) and a graphite block (13) arranged in the groove (12).

4. A vacuum pre-filter according to claim 3, wherein: a sliding cavity (14) for the graphite block (13) to slide longitudinally is arranged in the groove (12), a push plate (15) is arranged at the tail end of the graphite block (13), and an elastic part (16) which is abutted against the push plate (15) is arranged at the bottom of the sliding cavity (14) so that the push plate (15) has a tendency of being close to the lower sealing cover (7).

5. A vacuum pre-filter according to claim 4, wherein: the elastic piece (16) is a pressure spring, one end of the pressure spring is abutted against the plate surface of the push plate (15), and the other end of the pressure spring is abutted against the bottom of the sliding cavity (14).

6. A vacuum pre-filter according to claim 4, wherein: a limiting ring (17) is annularly arranged on the inner wall of the port of the sliding cavity (14) close to the lower sealing cover (7).

7. A vacuum pre-filter according to claim 2, wherein: the upper end face of the upper sealing cover (6) is provided with a driving block (18), and the driving block (18) is prism-shaped.

8. A vacuum pre-filter according to claim 1, wherein: a support rod (19) is connected between the upper sealing cover (6) and the lower sealing cover (7).

9. A vacuum pre-filter according to claim 1, wherein: the upper end of the filter body (2) is provided with a sealing cover (20).

10. A vacuum pre-filter according to claim 9, wherein: the sealing cover (20) is provided with a vacuum meter mounting position (21).