Backflow prevention device for vacuum pump

Abstract

The utility model discloses a backflow prevention device for a vacuum pump, which relates to the technical field of backflow prevention of vacuum pumps and comprises a front end connecting part, a control part and a rear end connecting part which are sequentially arranged. Liquid or gas can be prevented from flowing back into the vacuum pump to cause pollution and damage of the vacuum pump; meanwhile, after the vacuumizing operation is completed, the problem that gas or liquid flows back into a vacuumized device when the vacuum pump is pumped out can be prevented; by arranging the control part, pumped liquid or gas can be filtered, and the problem that the pump body is damaged is solved; and by arranging the rear end connecting part, pollutants can be prevented from entering the device in the maintenance process, and unnecessary loss is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum pump backflow prevention, in particular to a vacuum pump backflow prevention device. Background Art

[0002] A vacuum pump's backflow prevention device protects the entire vacuum system from reverse flow of the working fluid. If the vacuum pump stops operating or the pressure of the working fluid reverses, without a backflow prevention device, liquid or gas can flow back into the system. After the vacuum pump is complete, removing the vacuum pump could cause liquid or gas to flow back into the device being evacuated, potentially contaminating the system, damaging it, or even posing a safety risk.

[0003] Utility model patent publication number CN218293787U discloses a backflow prevention device for a vacuum pump; it includes a vacuum pump body, an exhaust pipe, and a buffer chamber. A symmetrical flow guide tube is located at one end of the vacuum pump body, with a flange connected to the upper end. These two flow guide tubes connect the vacuum pump to the intake and exhaust pipes, respectively. A buffer chamber is located above the exhaust pipe, with a rotating shaft mounted at its bottom and a baffle mounted on its outer wall. The rotating shaft passes through the outer wall of the buffer chamber, with a second handle mounted on one end. A sealing cover is threadedly connected to one side opening of the buffer chamber.

[0004] However, this prior art has a single usage mode and cannot prevent the problem of gas or liquid flowing back into the vacuumed device when the vacuum pump is removed after the vacuumed device has completed the vacuuming; it cannot filter the extracted liquid or gas, causing damage to the pump body. Utility Model Content

[0005] In response to the above technical problems, the utility model provides the following technical solutions: a backflow prevention device for a vacuum pump, comprising a front connecting part, a control part, and a rear connecting part arranged in sequence, the control part comprising a control shell, a control channel, a control air inlet chamber, and a control exhaust chamber arranged in the control shell; a control ball 1 and a control ball 2 for controlling the closing of the control channel are slidingly arranged in the control channel; the control ball 1 is connected to the control nut 2 through the control spring 1, and the control ball 2 is connected to the control nut 1 through the control spring 2; one end of the control channel is connected to the control air inlet chamber, and the other end of the control channel is connected to the control exhaust chamber, a control exhaust column is connected to one side of the control exhaust chamber, a control ball plug is slidingly arranged in the control exhaust column, and the control ball plug is connected to the control exhaust column through a control reset spring.

[0006] Furthermore, a rear end connecting portion is rotatably provided on the outer side of the control exhaust column, and the rear end connecting portion includes a rear end connecting nut rotatably provided on the outer side of the control exhaust column, the rear end connecting nut is threadedly engaged with the rear end connecting pipe, a rear end connecting ball plug is slidingly provided in the rear end connecting pipe, the rear end connecting ball plug is connected to the rear end connecting pipe through a rear end connecting spring, a rear end connecting column is fixedly provided on the rear end connecting ball plug, and the rear end connecting column is slidably engaged with the control ball plug.

[0007] Furthermore, a front end connecting portion is provided on one side of the control air intake chamber, and the front end connecting portion includes a front end connecting ball plug fixedly provided on the control air intake chamber, a front end connecting joint is slidingly provided inside the front end connecting ball plug, and the front end connecting joint is connected to the front end connecting ball plug through a front end connecting spring.

[0008] Furthermore, a filter is provided in the control air inlet cavity.

[0009] Furthermore, the control channel is V-shaped.

[0010] Furthermore, a sealing ring is provided at the contact portion between the rear end connecting pipe and the rear end connecting nut.

[0011] Furthermore, the control nut 1, control spring 2, control ball 2, control nut 2, control spring 1, control ball 1, and control channel are symmetrically arranged on both sides of the control air intake cavity and the control exhaust cavity.

[0012] Furthermore, the control nut 1 and the control nut 2 are both engaged with the control housing through threads.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention can prevent liquid or gas from flowing back into the vacuum pump, causing pollution or damage to the vacuum pump, by providing a control part; at the same time, it can prevent the problem of gas or liquid flowing back into the vacuumed device when the vacuum pump is evacuated after the vacuum operation is completed; 2. The present invention can filter the evacuated liquid or gas by providing a control part, thereby preventing the pump body from being damaged; 3. The present invention can prevent pollutants from entering the device during maintenance by providing a rear-end connection part, thereby avoiding unnecessary losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a cross-sectional view of the overall structure of the utility model Figure 1 .

[0015] Figure 2 This is a schematic diagram of the overall structure of the utility model from a front view angle.

[0016] Figure 3 It is a side view schematic diagram of the overall structure of the utility model.

[0017] Figure 4 This is a partial structural cross-sectional view of the rear end connection portion of the utility model.

[0018] Figure 5 This is a partial structural cross-sectional view of the control unit of the utility model.

[0019] Figure 6 This is a cross-sectional view of the overall structure of the utility model Figure 2 .

[0020] Figure markings: 1-rear end connecting part; 2-control part; 3-front end connecting part; 4-filter; 101-rear end connecting pipe; 102-rear end connecting spring; 103-rear end connecting ball plug; 104-rear end connecting column; 105-rear end connecting nut; 201-control housing; 202-control nut one; 203-control spring one; 204-control ball one; 205-control channel; 206-control nut two; 207-control ball two; 208-control spring two; 209-control air intake chamber; 210-control ball plug; 211-control return spring; 212-control exhaust chamber; 213-control exhaust column; 301-front end connecting ball plug; 302-front end connecting spring; 303-front end connecting joint. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] like Figures 1 to 6 As shown, a backflow prevention device for a vacuum pump includes a front connecting part 3, a control part 2, and a rear connecting part 1 arranged in sequence. The control part 2 includes a control shell 201, and a control channel 205, a control air inlet chamber 209, and a control exhaust chamber 212 are arranged in the control shell 201; a control ball 1 204 and a control ball 207 for controlling the closing of the control channel 205 are slidably arranged in the control channel 205; the control ball 1 204 is connected to the control nut 206 through the control spring 1 203, and the control ball 207 is connected to the control nut 1 202 through the control spring 208; one end of the control channel 205 is connected to the control air inlet chamber 209, and the other end of the control channel 205 is connected to the control exhaust chamber 212, a control exhaust column 213 is connected to one side of the control exhaust chamber 212, a control ball plug 210 is slidably arranged in the control exhaust column 213, and the control ball plug 210 is connected to the control exhaust column 213 through a control return spring 211.

[0023] like Figures 1 to 6As shown, a rear end connecting portion 1 is rotatably provided on the outside of the control exhaust column 213, and the rear end connecting portion 1 includes a rear end connecting nut 105 rotatably provided on the outside of the control exhaust column 213, and the rear end connecting nut 105 is threadedly engaged with the rear end connecting tube 101, and a rear end connecting ball plug 103 is slidingly provided in the rear end connecting tube 101, and the rear end connecting ball plug 103 is connected to the rear end connecting tube 101 through a rear end connecting spring 102, and a rear end connecting column 104 is fixedly provided on the rear end connecting ball plug 103, and the rear end connecting column 104 is slidably engaged with the control ball plug 210. A front end connecting part 3 is provided on one side of the control air inlet chamber 209, and the front end connecting part 3 includes a front end connecting ball plug 301 fixedly provided on the control air inlet chamber 209, and a front end connecting joint 303 is slidingly provided in the front end connecting ball plug 301, and the front end connecting joint 303 is connected to the front end connecting ball plug 301 through a front end connecting spring 302; a filter screen 4 is provided in the control air inlet chamber 209; the control channel 205 is V-shaped; a sealing ring is provided at the contact part between the rear end connecting pipe 101 and the rear end connecting nut 105; the control nut 1 202, the control spring 208, the control ball 207, the control nut 206, the control spring 1 203, the control ball 1 204, and the control channel 205 are symmetrically arranged on both sides of the control air inlet chamber 209 and the control exhaust chamber 212; the control nut 1 202 and the control nut 2 206 are both matched with the control housing 201 through threads.

[0024] like Figures 1 to 6 As shown, the utility model discloses a backflow prevention device for a vacuum pump, and its working principle is as follows;

[0025] Usage method 1:

[0026] Connect the front end connecting ball plug 301 of the device to the equipment that needs to be vacuumed, and connect the rear end connecting pipe 101 to the air inlet of the vacuum pump; turn on the vacuum pump, and the vacuum pump starts to work, sucking the air in the equipment that needs to be vacuumed from the front end connecting ball plug 301, and the air here enters the front end connecting ball plug 301, and the pressure pushes the front end connecting joint 303 to slide, so that the air in the front end connecting ball plug 301 enters the control air inlet chamber 209, and is filtered through the filter screen 4. After being filtered, the air here enters the control exhaust chamber 212 from the control channel 205 , and finally enters the rear end connecting pipe 101 through the channel in the control exhaust column 213 and is discharged by the vacuum pump; when the vacuum pump has completed vacuuming, the operator manually tightens the control nut 1 202 and the control nut 2 206, so that the control ball 2 207 and the control ball 1 204 close the channel at the control channel 205. At this time, the air at this position cannot flow, and at the same time, under the action of the front end connecting spring 302, the front end connecting joint 303 is close to the front end connecting ball plug 301. At this time, the air cannot flow back into the vacuumed equipment, preventing backflow and completing the vacuuming operation.

[0027] Method 2:

[0028] Connect the front end connecting ball plug 301 of the device to the exhaust port of the vacuum pump, turn on the vacuum pump, and the vacuum pump starts to work, and the air in the equipment that needs to be vacuumed is discharged from the front end connecting ball plug 301. The air here enters the front end connecting ball plug 301, and the pressure pushes the front end connecting joint 303 to slide, so that the air in the front end connecting ball plug 301 enters the control air inlet cavity 209 and is filtered through the filter 4. After being filtered, the air here enters the control exhaust cavity 212 from the control channel 205, and finally enters the control exhaust column 213 through the channel The rear end connecting pipe 101 is discharged; when the vacuum pump has finished drawing the vacuum, the operator manually tightens the control nut 1 202 and the control nut 2 206, so that the control ball 2 207 and the control ball 1 204 close the channel at the control channel 205. At this time, the air at this position cannot flow. At the same time, under the action of the front end connecting spring 302, the front end connecting joint 303 is close to the front end connecting ball plug 301. At this time, the air cannot flow back into the vacuum pump, preventing the gas inside the pipeline from being sucked back into the interior of the vacuum pump, thereby increasing the load when the vacuum pump is restarted.

[0029] During maintenance, the rear end connecting nut 105 is rotated so that the rear end connecting nut 105 is disengaged from the outer side of the rear end connecting tube 101, and the rear end connecting column 104 is also disengaged from the control ball plug 210. At this time, the control ball plug 210 is pushed to close the position under the action of the control return spring 211 to prevent foreign matter from invading and causing unnecessary losses.

Claims

1. A backflow prevention device for a vacuum pump, characterized in that: The invention comprises a front connecting portion (3), a control portion (2), and a rear connecting portion (1) which are arranged in sequence. The control portion (2) comprises a control housing (201). A control channel (205), a control air inlet cavity (209), and a control air outlet cavity (212) are arranged in the control housing (201); a control ball (204) and a control ball (207) for controlling the closing of the control channel (205) are slidably arranged in the control channel (205); the control ball (204) is connected to the control nut (207) via a control spring (203). 6), a second control ball (207) is connected to a first control nut (202) via a second control spring (208); one end of a control channel (205) is communicated with a control air inlet chamber (209), and the other end of the control channel (205) is communicated with a control exhaust chamber (212); one side of the control exhaust chamber (212) is connected to a control exhaust column (213), a control ball plug (210) is slidably provided in the control exhaust column (213), and the control ball plug (210) is connected to the control exhaust column (213) via a control return spring (211).

2. A backflow prevention device for a vacuum pump according to claim 1, characterized in that: A rear end connection portion (1) is rotatably provided on the outside of the control exhaust column (213), and the rear end connection portion (1) includes a rear end connection nut (105) rotatably provided on the outside of the control exhaust column (213), the rear end connection nut (105) and the rear end connection pipe (101) are threadedly engaged, a rear end connection ball plug (103) is slidably provided in the rear end connection pipe (101), the rear end connection ball plug (103) is connected to the rear end connection pipe (101) via a rear end connection spring (102), a rear end connection column (104) is fixedly provided on the rear end connection ball plug (103), and the rear end connection column (104) is slidably engaged with the control ball plug (210).

3. The backflow prevention device for a vacuum pump according to claim 2, characterized in that: A front end connecting portion (3) is provided on one side of the control air inlet cavity (209), and the front end connecting portion (3) comprises a front end connecting ball plug (301) fixedly provided on the control air inlet cavity (209), a front end connecting joint (303) is slidably provided inside the front end connecting ball plug (301), and the front end connecting joint (303) is connected to the front end connecting ball plug (301) via a front end connecting spring (302).

4. A backflow prevention device for a vacuum pump according to claim 3, characterized in that: A filter screen (4) is provided in the control air inlet cavity (209).

5. The backflow prevention device for a vacuum pump according to claim 4, characterized in that: The control channel (205) is V-shaped.

6. The backflow prevention device for a vacuum pump according to claim 5, characterized in that: A sealing ring is provided at the contact portion between the rear end connecting pipe (101) and the rear end connecting nut (105).

7. The backflow prevention device for a vacuum pump according to claim 6, characterized in that: The control nut 1 (202), the control spring 2 (208), the control ball 2 (207), the control nut 2 (206), the control spring 1 (203), the control ball 1 (204), and the control channel (205) are symmetrically arranged on both sides of the control air inlet cavity (209) and the control air outlet cavity (212).

8. The backflow prevention device for a vacuum pump according to claim 7, characterized in that: The control nut 1 (202) and the control nut 2 (206) are both engaged with the control housing (201) via threads.

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