CN208252346U - Rotary-vane vaccum pump is anti-to return oily structure - Google Patents
Rotary-vane vaccum pump is anti-to return oily structure Download PDFInfo
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- CN208252346U CN208252346U CN201820755583.2U CN201820755583U CN208252346U CN 208252346 U CN208252346 U CN 208252346U CN 201820755583 U CN201820755583 U CN 201820755583U CN 208252346 U CN208252346 U CN 208252346U
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Abstract
Prevent returning oily structure the utility model discloses a kind of rotary-vane vaccum pump, belong to vacuum pump technology field, it includes bracket, pump front cover and the air inlet on bracket, the anti-of access between air inlet and pump chamber can be connected to or cut off by, which being equipped in the bracket, returns oil valve, in the bracket holes that the anti-valve rod for returning oil valve is inserted in bracket, and with bracket holes clearance fit, a piston hole is equipped in the pump front cover, it is successively opened on the hole wall of piston hole along axial direction and is respectively communicated with bracket holes, fuel level in tank ceiling space, first hole of bracket oil circuit, second hole, third hole, piston valve core is equipped in piston hole, the piston valve core is arranged to: making the first hole when initial position, access connection between second hole, when vacuum pump operation, it is moved under the promotion of bracket oil circuit pressure oil and cuts off the first hole, access between second hole.The utility model structure is simple, manufacturing cost is low, can in termination of pumping instantaneous trip gas circuit, and make pump chamber inner fluid stationary, anti-to return oily effect good.
Description
Technical field
The utility model relates to vacuum pump technology fields more particularly to a kind of the anti-of rotary-vane vaccum pump to return oily structure.
Background technique
Oil sealing rotary-vane vaccum pump is to make gas volume variation come compressed gas by blade high speed rotation, and make gas
It is arranged by compression end to exhaust end and realizes and vacuumize purpose, the sealing means between each component are oil seal, after vacuum pump use
When stopping, often because the effects of liquid level difference, gravity, pressure makes pump oil from returning to being evacuated in container in pump chamber, cause by
Vacuum-pumping container pollution.
Currently used for oil sealing rotary-vane vaccum pump it is anti-return oily structure be usually lean on spring reset to bear with by pumping system vacuum
Pressure absorption valve pushes by oil pump oil liquid pressure to close gas circuit and opens valve with vacuum pump work suction to be connected to gas circuit.This
Kind structural control devices are more, it is desirable that the machining accuracy of part is high, and control oil circuit is complicated, increases manufacturing cost；Meanwhile no
Have makes pump chamber inner fluid bear pressure in termination of pumping moment has the function that balance with outer atmospheric pressure, thus when cannot achieve termination of pumping
Allow the function that oil liquid is stationary.
Utility model content
The technical problem to be solved by the utility model is to overcome the above problem, and provide that a kind of structure is simple, work
Reliably, the low rotary-vane vaccum pump of manufacturing cost is anti-returns oily structure, controls gas circuit by the negative pressure variation of pump chamber and work system
Opening and closing, when termination of pumping can instantaneous trip gas circuit, and make pump chamber inner fluid stationary, anti-returned so that comprehensive function reaches ideal
Oily effect.
The technical solution of the utility model is:
A kind of rotary-vane vaccum pump is anti-to return oily structure, and including the bracket being set between pump motor and fuel tank, pump head is set to
In fuel tank, the pump front cover of pump head is fixedly connected on bracket side, and the air inlet of vacuum pump is set on bracket, and connection is equipped in bracket
The inlet channel of air inlet and pump chamber, for vacuum pump provide pumping fluid bracket oil circuit, it is characterised in that: the bracket
In be equipped with and can move up and down to cut off or be connected to the anti-of access between air inlet and pump chamber and return oil valve, the anti-valve rod for returning oil valve
Be inserted in the bracket holes opened up in bracket, and with the bracket holes clearance fit, a piston hole is equipped in the pump front cover,
It successively opens along axial direction on the hole wall of the piston hole and to be respectively communicated with bracket holes, fuel level in tank ceiling space, bracket oil circuit
First hole, the second hole, third hole are equipped with piston valve core in piston hole, and the piston valve core is arranged to: making the when initial position
Access connection between one hole, the second hole, when vacuum pump operation, moves under the promotion of bracket oil circuit pressure oil and cuts off first
Access between hole, the second hole.
Further, piston hole described in the utility model is a lateral blind hole, is followed successively by from inside to outside equipped with first
The path section in hole, equipped with the second hole, the maximum technique hole section of the major diameter section in third hole and aperture, the aperture in the second hole is close to small
Diameter section, the aperture in third hole is close to technique hole section；Reset spring, piston valve core and gear are set gradually in piston hole from inside to outside
Plate, the baffle plate setting are kept off in the outside of major diameter section, piston valve core includes matching with major diameter section internal diameter in the inner end of technique hole section
Piston portion, the spool portion on the inside of piston portion and the limiting section on the outside of piston portion, the limiting section is for limiting work
Piston part is in the inside in third hole aperture always, the reset spring be connected to the piston portion and major diameter section inner face it
Between, the joint of major diameter section and path section is valve port；Piston valve core moves outwardly to limiting section top under the action of reset spring
Firmly baffle, spool portion is far from valve port at this time, the access connection between the first hole, the second hole, and when vacuum pump operation, piston valve core exists
Spool portion is moved inwardly under the promotion of bracket oil circuit pressure oil and seals valve port, at this time the access quilt between the first hole, the second hole
Cutting.
Further, a gasket is equipped at valve port described in the utility model, the gasket fits snugly in valve port
It is interior, and there is axially extending bore.The spool portion of piston valve core can be against on gasket when sealing valve port, can increase leakproofness.
Further, the outside of baffle described in the utility model is equipped with a retaining ring, and the retaining ring is embedded in fabrication hole hole
With axial restraint baffle in the ring slot opened up on wall.
Further, the anti-oil valve that returns described in the utility model includes the valve rod and is set in the anti-of valve stem tip and returns oil
Spool, it is anti-return oil valve be moved upward to it is described it is anti-return oil valve core and seal the lower end aperture of air inlet air inlet and pump chamber then can be cut off
Between access.
The beneficial effects of the utility model are: controlling the opening and closing of gas circuit by the negative pressure variation of pump chamber and work system, stop
Energy instantaneous trip gas circuit when pump, and make pump chamber inner fluid stationary, duplicate protection comprehensive function reaches ideal and prevents returning oily effect
Fruit, and structure is simple, reliable operation, and not high to the machining accuracy of part, manufacturing cost is low.
Detailed description of the invention
Fig. 1 is the sectional structure chart of bracket in the utility model embodiment.
Fig. 2 is the sectional structure chart that front cover is pumped in the utility model embodiment.
Fig. 3 is the structure chart of piston valve core in the utility model embodiment.
Specific embodiment
The utility model is further described now in conjunction with drawings and examples:
In the description of the present invention, it should be understood that side indicated by the terms such as "upper", "lower", "inner", "outside"
Position or positional relationship are to be based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description the utility model, rather than
The device or original part of indication or suggestion meaning must have a particular orientation, therefore should not be understood as the limit to the utility model
System.
As depicted in figs. 1 and 2, a kind of rotary-vane vaccum pump provided in this embodiment is anti-returns oily structure, including is set to pump electricity
Bracket 1 between machine and fuel tank, pump head is set in fuel tank, and the pump front cover 2 of pump head is fixedly connected on 1 side of bracket, vacuum pump
Air inlet 3 be set to bracket 1 on, in bracket 1 be equipped with connection air inlet 3 and pump chamber inlet channel 11, for being mentioned to vacuum pump
For the bracket oil circuit of pumping fluid.Being equipped in bracket 1 can move up and down to cut off or be connected to access between air inlet 3 and pump chamber
Anti- to return oil valve 4, the anti-oil valve 4 that returns includes valve rod 41 and is set in the anti-of 41 top of valve rod and returns oil valve core 42, and valve rod 41 is inserted in branch
In the bracket holes 12 opened up in frame 1, and with 12 clearance fit of bracket holes, it is anti-return oil valve 4 and be moved upward to anti-return oil valve core 42
Seal the lower end aperture of air inlet 3 then and can be cut off the access between air inlet 3 and pump chamber.It pumps and is equipped with a piston hole 5 in front cover 2,
Successively open on the hole wall of piston hole 5 along axial direction be respectively communicated with bracket holes 12, fuel level in tank ceiling space, bracket oil circuit
One hole A, the second hole B, third hole C, fuel level in tank ceiling space is connected to outside fuel tank and the second hole B is connected to outer atmosphere.Piston hole
Piston valve core 51 is equipped in 5, piston valve core 51 is arranged to: connecting the access between the first hole A, the second hole B when initial position
It is logical, when vacuum pump operation, is being moved under the promotion of bracket oil circuit pressure oil and cutting off the access between the first hole A, the second hole B.
As shown in Fig. 2, piston hole 5 is a lateral blind hole, the specific structure in piston hole 5 is as follows: piston hole 5 by it is interior to
It is followed successively by path section 5a equipped with the first hole A outside, equipped with the second hole B, the maximum technique of the major diameter section 5b of third hole C and aperture
The aperture of hole section 5c, the second hole B are close to path section 5a, and the aperture of third hole C is close to technique hole section 5c.In piston hole 5 by it is interior to
Gasket 52, reset spring 53, piston valve core 51, baffle 54 and retaining ring 55 are set gradually outside, baffle 54 is set to technique hole section
The inner end of 5c, gear are embedded in the ring slot opened up on technique hole section 5c hole wall in the outside of major diameter section 5b, retaining ring 55 with axial direction
Fixed baffle 54.Piston valve core 51 includes and the matched piston portion 511 of major diameter section 5b internal diameter, the valve set on the inside of piston portion 511
Core 512 and the limiting section 513(reference attached drawing 3 on the outside of piston portion 511), limiting section 513 is for limiting the beginning of piston portion 511
It is in the inside in the third hole aperture C eventually, reset spring 53 is connected between piston portion 511 and the inner face of major diameter section 5b, major diameter
The joint of section 5b and path section 5a is valve port, and gasket 52 fits snugly in valve port, and has axially extending bore.Piston valve core
51, which move outwardly to limiting section 513 under the action of reset spring 53, withstands baffle 54, and spool portion 512 is far from valve port at this time, and
Access connection between one hole A, the second hole B, when vacuum pump operation, piston valve core 51 under the promotion of bracket oil circuit pressure oil to
It is inside moved to spool portion 512 and seals valve port, the access between the first hole A, the second hole B is cut off at this time.
The working principle of the utility model is as follows:
It is anti-to return the branch that oil valve core 42 falls in 12 aperture of bracket holes due to the anti-self gravity for returning oil valve 4 before vacuum pump work
In frame plane, air inlet 3 is connected to pump chamber, due to valve rod 41 and 12 clearance fit of bracket holes, between bracket holes 12 and pump chamber
Nor sealing；Piston valve core 51 is placed in outer fix under the action of reset spring 53, and limiting section 513 withstands baffle 54,
Spool portion 512 is far from the gasket 52 at valve port, the connection of access between the first hole A, the second hole B, i.e. vacuum pump work at this time
System and outer atmosphere.
When vacuum pump startup, operation of oil pump discharge pressure oil reaches in piston hole 5 via bracket oil circuit, third hole C, pushes
Piston valve core 51 is to 5 medial movement of piston hole, until spool portion 512 is against on gasket 52 and seals valve port, has cut off the first hole
A, the access between the second hole B, that is, close the access of work system Yu outer atmosphere.
When vacuum pump is shut down, oil pump stops working, and piston valve core 51 resets under the action of reset spring 53, the second hole B
Again it is connected to the first hole A, bracket holes 12, work system moment and outer atmosphere pressure release, thus in work system and air inlet
Strong pressure difference is formed between mouth 3, under the action of the pressure difference, prevents that return oil valve 4 is adsorbed onto air inlet 3 by moment upwards
Place, it is anti-return oil valve core 42 and seal the lower end aperture of air inlet 3 prevented in pump chamber to cut off the access of air inlet 3 Yu pump chamber
Pump oil is returned to container is evacuated.With the extension of downtime, pump chamber realizes pressure balance with outer atmosphere quickly, in pump chamber
Oil liquid no longer flows, when negative pressure variation in air inlet 3, be not enough to adsorb it is anti-return oil valve 4, the anti-oil valve 4 that returns because self gravity resets,
When pump chamber is connected to air inlet 3, pump chamber inner fluid pressure release already balance, therefore oil liquid will not flow, and further avoid returning oil,
Securely and reliably.
It is understood that for those of ordinary skill in the art, it can be with technology structure according to the present utility model
Think of makes various other changes and modifications, and all these changes and deformation all should belong to the utility model claims
Protection scope.
Claims (5)
1. a kind of rotary-vane vaccum pump is anti-to return oily structure, including the bracket being set between pump motor and fuel tank, pump head is set to oil
In case, the pump front cover of pump head is fixedly connected on bracket side, and the air inlet of vacuum pump is set on bracket, be equipped in bracket be connected into
The inlet channel of port and pump chamber, for vacuum pump provide pumping fluid bracket oil circuit, it is characterised in that: in the bracket
Oil valve is returned to cut off or be connected to the anti-of access between air inlet and pump chamber equipped with that can move up and down, the anti-valve rod for returning oil valve is inserted
In the bracket holes opened up in bracket, and with the bracket holes clearance fit, a piston hole, institute are equipped in the pump front cover
State on the hole wall of piston hole successively opened along axial direction be respectively communicated with bracket holes, fuel level in tank ceiling space, bracket oil circuit
One hole, the second hole, third hole, piston hole is interior to be equipped with piston valve core, and the piston valve core is arranged to: making first when initial position
Access connection between hole, the second hole, when vacuum pump operation, moves under the promotion of bracket oil circuit pressure oil and cuts off first
Access between hole, the second hole.
2. rotary-vane vaccum pump according to claim 1 is anti-to return oily structure, it is characterised in that: the piston hole is one lateral
Blind hole, be followed successively by path section equipped with the first hole, maximum equipped with the second hole, the major diameter section in third hole and aperture from inside to outside
Technique hole section, the aperture in the second hole is close to path section, and the aperture in third hole is close to technique hole section；In piston hole from inside to outside according to
Secondary setting reset spring, piston valve core and baffle, the baffle plate setting are kept off in the inner end of technique hole section in the outside of major diameter section,
Piston valve core includes with the matched piston portion of major diameter section internal diameter, the spool portion on the inside of piston portion and on the outside of piston portion
Limiting section, for the limiting section for limiting the inside that piston portion is in third hole aperture always, the reset spring is connected to institute
It states between piston portion and the inner face of major diameter section, the joint of major diameter section and path section is valve port；Piston valve core is in reset spring
Under the action of move outwardly to limiting section and withstand baffle, far from valve port, the access between the first hole, the second hole connects in spool portion at this time
Logical, when vacuum pump operation, piston valve core moves inwardly into spool portion under the promotion of bracket oil circuit pressure oil and seals valve port, at this time
Access between first hole, the second hole is cut off.
3. rotary-vane vaccum pump according to claim 2 is anti-to return oily structure, it is characterised in that: it is close to be equipped with one at the valve port
Packing, the gasket fit snugly in valve port, and have axially extending bore.
4. rotary-vane vaccum pump according to claim 2 is anti-to return oily structure, it is characterised in that: the outside of the baffle is equipped with
One retaining ring, the retaining ring are embedded in the ring slot opened up on fabrication hole hole wall with axial restraint baffle.
5. rotary-vane vaccum pump according to claim 1 is anti-to return oily structure, it is characterised in that: described to prevent that returning oil valve includes institute
State valve rod and be set in the anti-of valve stem tip and return oil valve core, it is anti-return oil valve and be moved upward to described anti-return oil valve core and seal air inlet
Lower end aperture the access between air inlet and pump chamber then can be cut off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820755583.2U CN208252346U (en) | 2018-05-21 | 2018-05-21 | Rotary-vane vaccum pump is anti-to return oily structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820755583.2U CN208252346U (en) | 2018-05-21 | 2018-05-21 | Rotary-vane vaccum pump is anti-to return oily structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208252346U true CN208252346U (en) | 2018-12-18 |
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ID=66481732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820755583.2U Active CN208252346U (en) | 2018-05-21 | 2018-05-21 | Rotary-vane vaccum pump is anti-to return oily structure |
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| CN (1) | CN208252346U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113217387A (en) * | 2021-05-22 | 2021-08-06 | 浙江恒翔神工真空科技有限公司 | Oil return anti-pollution vacuum pump |
-
2018
- 2018-05-21 CN CN201820755583.2U patent/CN208252346U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113217387A (en) * | 2021-05-22 | 2021-08-06 | 浙江恒翔神工真空科技有限公司 | Oil return anti-pollution vacuum pump |
| CN113217387B (en) * | 2021-05-22 | 2022-08-12 | 浙江恒翔神工真空科技有限公司 | Oil return anti-pollution vacuum pump |
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