A mounting structure for a built-in electromagnetic valve of a vacuum pump

Abstract

The present invention provides an installation structure for a built-in electromagnetic valve in a vacuum pump, and belongs to the technical field of vacuum pumps. It solves the technical problems of a large amount of scrapped brackets, inconvenient processing, and poor sealing performance on existing vacuum pumps. The vacuum pump includes a pump body, an electromagnetic valve, and a bracket. The pump body is fixedly mounted on the bracket. The installation structure includes an electromagnetic valve seat fixedly mounted on the bracket. The bracket is provided with an air inlet channel and an air passage. The electromagnetic valve seat is provided with a vent hole 1 communicating with the air inlet channel and a vent hole 2 communicating with the air passage. The electromagnetic valve is sealed and fixed on the electromagnetic valve seat and a sealing gasket is provided inside. The sealing gasket can move back and forth in the electromagnetic valve to close one end of the vent hole 1 away from the air inlet channel or to connect the vent hole 1 with the vent hole 2. The electromagnetic valve seat in the present invention can seal the electromagnetic valve and the bracket, which can reduce the requirements of the vacuum pump on the cost and quality of the bracket and reduce the amount of scrapped brackets.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum pumps and relates to an installation structure of a built-in electromagnetic valve of a vacuum pump. Background Art

[0002] A vacuum pump refers to a device or equipment that uses mechanical, physical, chemical or physicochemical methods to evacuate the container to obtain a vacuum. Generally speaking, a vacuum pump is a device that uses various methods to improve, generate and maintain a vacuum in a closed space; a solenoid valve is a special valve installed on a vacuum pump. The solenoid valve and the vacuum pump are connected to the same power supply. The opening and stopping of the vacuum pump directly controls the opening and closing of the solenoid valve. When the vacuum pump stops working or the power supply is suddenly interrupted, the solenoid valve can automatically close the vacuum system and fill the atmosphere into the pump chamber through the air inlet of the vacuum pump to prevent the pump oil from flowing back and polluting the vacuum system; generally, the pump body on the vacuum pump is connected to the solenoid valve through a bracket. Due to the presence of holes on the bracket, in order to prevent the vacuum pump from leaking, higher requirements must be placed on the quality of the finished bracket, which results in a large amount of bracket scrapping. Summary of the invention

[0003] In view of the above problems existing in the prior art, the present invention provides an installation structure of a built-in electromagnetic valve in a vacuum pump. The technical problem to be solved by the present invention is: how to improve the sealing performance of the electromagnetic valve installation and reduce the scrapping amount of the bracket on the vacuum pump.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A mounting structure for a vacuum pump with a built-in solenoid valve, the vacuum pump comprising a pump body, a solenoid valve and a bracket, the pump body being fixedly mounted on the bracket, and characterized in that the mounting structure comprises a solenoid valve seat fixedly mounted on the bracket, the bracket being provided with an air inlet passage and an air through passage, the solenoid valve seat being provided with an air vent 1 communicating with the air inlet passage and an air vent 2 communicating with the air through passage, the solenoid valve being sealed and fixed on the solenoid valve seat and having a sealing gasket inside, the sealing gasket being able to reciprocate in the solenoid valve to close an end of the air vent 1 away from the air inlet passage or to connect the air vent 1 with the air vent 2.

[0006] Its working principle is as follows: the bracket in this technical solution is an aluminum die-casting and has an air intake channel and an air passage inside. The hardness is not high. If the solenoid valve is directly installed on the bracket, it is easy to cause gas to leak out from the gap between the bracket and the solenoid valve. If you want to achieve a better sealing effect, this has strict requirements on the quality of the finished product of the bracket. Now the solenoid valve seat is used to connect the solenoid valve to the bracket. Since the solenoid valve seat has no airway, it is easier to process. It is easy to connect the bracket and the solenoid valve through the solenoid valve seat and achieve good sealing of the three connections. This can reduce the quality requirements for the finished bracket and reduce the amount of bracket scrapped.

[0007] In the above-mentioned vacuum pump built-in electromagnetic valve installation structure, the bracket is provided with an electromagnetic valve seat installation hole for the electromagnetic valve seat to be embedded, the outer side of one end of the electromagnetic valve seat has a convex edge extending outward, one side of the convex edge abuts against the bracket and has several through holes, the bracket has several threaded holes corresponding to the through holes, bolts are inserted into the through holes and the ends of the bolts are screwed into the threaded holes. The electromagnetic valve seat is fixed to the bracket by bolts, and the connection between the two is relatively firm.

[0008] In the above-mentioned mounting structure of the built-in electromagnetic valve of the vacuum pump, the bracket has a connecting portion extending outward, the connecting portion is located on the bottom surface of the electromagnetic valve seat mounting hole, the end of the electromagnetic valve seat away from the convex edge is provided with an inwardly recessed positioning groove, the connecting portion is embedded in the positioning groove and the groove wall of the positioning groove abuts against the outer side surface of the connecting portion, the inner end of the air intake channel extends to the end surface of the connecting portion, and the end of the vent hole away from the sealing gasket is located on the bottom surface of the positioning groove. The connection portion and the positioning groove can be provided to position the electromagnetic valve seat to ensure that the air intake channel and the vent hole are connected.

[0009] In the above-mentioned vacuum pump built-in electromagnetic valve installation structure, the electromagnetic valve seat has an electromagnetic valve installation hole at one end with the convex edge, one end of the electromagnetic valve is screwed into the electromagnetic valve installation hole, the bottom surface of the electromagnetic valve installation hole has a protrusion extending outward, the vent hole 1 passes through the protrusion and one end is located on the end surface of the protrusion, and the sealing gasket can abut against the end surface of the protrusion. When the vacuum pump starts working, the sealing gasket moves away from the vent hole 1 under the action of the electromagnetic valve, so that the gas in the vent hole 1 flows into the vent hole 2. When the vacuum pump stops working, the end surface of the sealing gasket abuts against the end surface of the protrusion, preventing the gas in the vent hole 1 from flowing into the pump body.

[0010] In the above-mentioned vacuum pump built-in solenoid valve installation structure, the end surface of the protrusion is an annular spherical surface protruding outward. Since the sealing gasket is relatively soft and easily deformed by external influences, the end surface of the protrusion is set as an annular spherical surface. Even if the sealing gasket is deformed, it will not cause the vacuum pump to leak when it contacts the end surface of the protrusion.

[0011] In the above-mentioned vacuum pump built-in electromagnetic valve installation structure, an inward installation groove 1 is opened at the outer side of the electromagnetic valve seat near the convex edge, and an installation groove 2 is opened on the groove wall of the positioning groove. A sealing ring 1 is arranged in the installation groove 1, and a sealing ring 2 is arranged in the installation groove 2; a sealing ring 3 is sleeved on the electromagnetic valve, and the sealing ring 3 is located in the electromagnetic valve installation hole and the outer side surface abuts against the inner wall of the electromagnetic valve installation hole. The provision of sealing ring 1, sealing ring 2 and sealing ring 3 can ensure that the connection between the electromagnetic valve seat and the bracket, and the connection between the electromagnetic valve and the electromagnetic valve seat have good air tightness.

[0012] In the above-mentioned vacuum pump built-in electromagnetic valve installation structure, the electromagnetic valve seat has a plurality of vent holes 2, and the plurality of vent holes 2 are spaced apart and distributed at the junction of the hole wall and the bottom surface of the electromagnetic valve installation hole. When the gas flows from the vent hole 1 to the vent hole 2, the sealing ring is subjected to a relatively uniform force, thereby extending the service life of the sealing ring.

[0013] In the above-mentioned vacuum pump built-in electromagnetic valve installation structure, the electromagnetic valve and the pump body are respectively located on both sides of the bracket; the electromagnetic valve is a pilot electromagnetic valve, a pilot valve is arranged inside the pilot electromagnetic valve, and the sealing gasket is fixed at one end of the pilot valve. The pilot electromagnetic valve has the advantages of blocking external leakage, easy control of internal leakage and safe use, which can make the vacuum pump have better vacuuming effect and higher safety.

[0014] Compared with the prior art, the electromagnetic valve is installed on the bracket by using the electromagnetic valve seat in the present invention, which can reduce the quality requirements for the finished bracket and reduce the scrap amount of the bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a front view of the mounting structure of the built-in solenoid valve of this vacuum pump.

[0016] Figure 2 This is a partial cross-sectional view of the mounting structure of the built-in solenoid valve of this vacuum pump.

[0017] Figure 3 yes Figure 2 Schematic diagram of the local enlarged structure at point A in the middle.

[0018] In the figure, 1, pump body; 2, solenoid valve; 21, pilot solenoid valve; 21a, pilot valve; 21b, sealing gasket; 3, bracket; 31, air inlet channel; 32, air passage; 33, solenoid valve seat mounting hole; 34, threaded hole; 35, connecting part; 4, solenoid valve seat; 41, vent hole 1; 42, vent hole 2; 43, convex edge; 43a, through hole; 44, positioning groove; 45, solenoid valve mounting hole; 45a, protrusion; 46, mounting groove 1; 47, mounting groove 2; 5, bolt; 6, sealing ring 1; 7, sealing ring 2; 8, sealing ring 3. DETAILED DESCRIPTION

[0019] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0020] like Figures 1 to 3 As shown, the vacuum pump in this embodiment includes a pump body 1, a solenoid valve 2 and a bracket 3. The pump body 1 is fixed on one side of the bracket 3, and a motor is provided on the other side of the bracket 3. The solenoid valve 2 in this embodiment is a pilot solenoid valve 21, which has a pilot valve 21a therein. The pilot valve 21a can move back and forth in the pilot solenoid valve 21, and a sealing gasket 21b is embedded at the end of the pilot valve 21a, and the sealing gasket 21b is fixedly connected to the pilot valve 21a; the mounting structure includes a solenoid valve seat 4, and the bracket 3 is provided with an air inlet channel 31 connected to the outside, a solenoid valve seat mounting hole 33 for the solenoid valve seat 4 to be embedded, and an air passage 32, and the solenoid valve seat 4 is provided with a vent hole 1 41 connected to the air inlet channel 31, a plurality of vent holes 2 42 and a gas passage 32 for the solenoid valve seat 4 to be embedded. In the solenoid valve mounting hole 45 for installing the solenoid valve 2, several vent holes 42 are all connected with the air passage 32, the sealing gasket 21b and one end of the pilot valve 21a are located in the solenoid valve mounting hole 45, and several vent holes 42 are distributed at intervals at the junction of the hole wall and the bottom surface of the solenoid valve mounting hole 45. When the vacuum pump is powered off, the end of the sealing gasket 21b can block the end of the vent hole 1 41 away from the air inlet passage 31. When the vacuum pump is working, the pilot valve 21a drives the sealing gasket 21b to move in the direction away from the vent hole 1 41, and at this time, the vent hole 1 41 is connected with the vent hole 2 42.

[0021] Further, such as Figures 1 to 3As shown, the outer side of the end of the solenoid valve seat 4 away from the pump body 1 has an outwardly extending convex edge 43, one side of the convex edge 43 abuts against the bracket 3, and a plurality of through holes 43a are formed on the convex edge 43, and a plurality of threaded holes 34 corresponding to the through holes 43a are formed on the bracket 3, and a bolt 5 is provided in the through hole 43a, and the end of the bolt 5 is located in the threaded hole 34 and is screwed with the threaded hole 34, and the other end of the solenoid valve seat 4 has an inwardly recessed positioning groove 44, and the bracket 3 has a connecting portion 35 extending outward, and the connecting portion 35 is located on the bottom surface of the solenoid valve seat mounting hole 34, and one end of the air inlet channel 31 is located on the outer surface of the bracket 3, and the other end of the air inlet channel 31 extends to On the end surface of the connecting portion 35, one end of the vent hole 41 away from the sealing gasket 21b is located on the bottom surface of the positioning groove 44, one end of the air inlet channel 31 is arranged opposite to one end of the vent hole 41, a mounting groove 46 is opened on the outer side of the solenoid valve seat 4 near the convex edge 43, a sealing ring 6 is arranged in the mounting groove 46, the outer side of the sealing ring 6 abuts against the hole wall of the solenoid valve seat mounting hole 33, a mounting groove 2 47 is opened on the groove wall of the positioning groove 44, a sealing ring 2 7 is arranged in the mounting groove 2 47, and the inner side surface of the sealing ring 2 7 abuts against the outer side surface of the connecting portion 35; the sealing ring 1 6 and the sealing ring 2 7 are arranged to improve the sealing performance of the connection between the solenoid valve seat 4 and the bracket 3.

[0022] Further, such as Figures 1 to 3 As shown, one end of the solenoid valve 2 is screwed into the solenoid valve mounting hole 45 and a sealing ring 3 8 is sleeved on the outer side of the solenoid valve 2 near the end portion. The outer side of the sealing ring 3 8 abuts against the inner wall of the solenoid valve mounting hole 45 near the end with the convex edge 43. The bottom surface of the solenoid valve mounting hole 45 has a protrusion 45a. The vent 1 41 passes through the protrusion 45a and one end is located on the end surface of the protrusion 45a. The end surface of the protrusion 45a is an annular spherical surface protruding outward. When the power is off, it can prevent air leakage at the junction of the end surface of the sealing gasket 21b and the end surface of the protrusion 45a.

[0023] Here, the electromagnetic valve 2 is installed on the bracket 3 using the electromagnetic valve seat 4, which can prevent gas from leaking out when the vacuum pump is not working, reduce the requirements for the quality of the finished product of the bracket 3, and reduce the amount of bracket 3 that is scrapped.

[0024] 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.

Claims

1. A mounting structure of a vacuum pump with a built-in electromagnetic valve, the vacuum pump comprising a pump body (1), an electromagnetic valve (2) and a bracket (3), the pump body (1) being fixed on the bracket (3), characterized in that: The mounting structure comprises an electromagnetic valve seat (4) fixedly mounted on the bracket (3), the bracket (3) being provided with an air inlet passage (31) and an air passage (32), the electromagnetic valve seat (4) being provided with an air vent 1 (41) communicating with the air inlet passage (31) and an air vent 2 (42) communicating with the air passage (32), the electromagnetic valve (2) being sealed and fixed on the electromagnetic valve seat (4) and having a sealing gasket (21b) disposed therein, the sealing gasket (21b) being capable of reciprocating movement in the electromagnetic valve (2) to close an end of the air vent 1 (41) away from the air inlet passage (31) or to connect the air vent 1 (41) with the air vent 2 (42); The bracket (3) is provided with an electromagnetic valve seat mounting hole (33) for embedding the electromagnetic valve seat (4); the outer side of one end of the electromagnetic valve seat (4) is provided with a convex edge (43) extending outward; one side of the convex edge (43) abuts against the bracket (3) and is provided with a plurality of through holes (43a); the bracket (3) is provided with a plurality of threaded holes (34) corresponding to the through holes (43a) one by one; a bolt (5) is inserted into the through hole (43a) and the end of the bolt (5) is screwed into the threaded hole (34); The bracket (3) has a connecting portion (35) extending outwards, the connecting portion (35) is located on the bottom surface of the electromagnetic valve seat mounting hole (33), an end of the electromagnetic valve seat (4) away from the convex edge (43) is provided with an inwardly recessed positioning groove (44), the connecting portion (35) is embedded in the positioning groove (44) and the groove wall of the positioning groove (44) abuts against the outer side surface of the connecting portion (35), the air intake channel (31) extends to the end surface of the connecting portion (35), and the end of the vent hole (41) away from the sealing gasket (21b) is located on the bottom surface of the positioning groove (44); The electromagnetic valve seat (4) has an electromagnetic valve mounting hole (45) formed at one end of the convex edge (43), one end of the electromagnetic valve (2) is screwed into the electromagnetic valve mounting hole (45), the bottom surface of the electromagnetic valve mounting hole (45) has a protrusion (45a) extending outward, the vent hole (41) passes through the protrusion (45a) and one end is located on the end surface of the protrusion (45a), and the sealing gasket (21b) can abut against the end surface of the protrusion (45a); The end surface of the protruding portion (45a) is an annular spherical surface protruding outward; An inwardly facing mounting groove 1 (46) is formed on the outer side of the solenoid valve seat (4) near the convex edge (43); a mounting groove 2 (47) is formed on the groove wall of the positioning groove (44); a sealing ring 1 (6) is provided in the mounting groove 1 (46); a sealing ring 2 (7) is provided in the mounting groove 2 (47); a sealing ring 3 (8) is sleeved on the solenoid valve (2); the sealing ring 3 (8) is located in the solenoid valve mounting hole (45) and the outer side surface thereof abuts against the inner wall of the solenoid valve mounting hole (45); The electromagnetic valve seat (4) is provided with a plurality of second vent holes (42), and the plurality of second vent holes (42) are distributed at intervals at the junction of the hole wall and the bottom surface of the electromagnetic valve installation hole (45).

2. The mounting structure of the built-in electromagnetic valve of the vacuum pump according to claim 1, characterized in that: The solenoid valve (2) and the pump body (1) are respectively located on both sides of the bracket (3); the solenoid valve (2) is a pilot solenoid valve (21), a pilot valve (21a) is provided in the pilot solenoid valve (21), and the sealing gasket (21b) is fixedly arranged at one end of the pilot valve (21a).

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