CN114593063A - Vacuum pump with bypass structure - Google Patents
Vacuum pump with bypass structure Download PDFInfo
- Publication number
- CN114593063A CN114593063A CN202011407804.5A CN202011407804A CN114593063A CN 114593063 A CN114593063 A CN 114593063A CN 202011407804 A CN202011407804 A CN 202011407804A CN 114593063 A CN114593063 A CN 114593063A
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- CN
- China
- Prior art keywords
- bypass valve
- vacuum pump
- bypass
- valve core
- spring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007789 sealing Methods 0.000 claims abstract description 19
- 230000009471 action Effects 0.000 claims description 3
- 238000000605 extraction Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 abstract 5
- 210000000078 claw Anatomy 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
- F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
- F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The invention relates to a vacuum pump, in particular to a vacuum pump with a bypass structure. The vacuum pump comprises a bypass valve structure, a vacuum pump body and a sealing plate, wherein the bypass valve structure is arranged in the sealing plate on one side of the vacuum pump body and is connected between an exhaust cavity and an air inlet cavity of the vacuum pump body; the bypass valve arrangement may be opened by the exhaust chamber pressure to return exhaust chamber gases to the intake chamber. The bypass structure is arranged in the sealing plate at one side of the vacuum pump body and the rotor, and when the bypass structure is opened, gas returns to the gas inlet from the gas outlet through the bypass structure, so that the Roots vacuum pump can be started at the same time under atmospheric pressure, the Roots vacuum pump and the backing pump can run continuously at the same time, the gas extraction time can be shortened, and the working efficiency can be improved.
Description
Technical Field
The invention relates to a vacuum pump, in particular to a vacuum pump with a bypass structure.
Background
In the existing vacuum pump, especially the roots vacuum pump is started after the screw vacuum pump or the claw vacuum pump is required to operate for a period of time under atmospheric pressure in the process of operating a unit formed by connecting the roots vacuum pump and the screw vacuum pump or the claw vacuum pump in series, so that the air extraction time is prolonged, and the working efficiency of the vacuum pump is reduced.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a vacuum pump with a bypass structure, so as to solve the problems of long pumping time and low working efficiency of the existing vacuum pump.
In order to achieve the purpose, the invention adopts the following technical scheme:
a vacuum pump with a bypass structure comprises a bypass valve structure, a vacuum pump body and a sealing plate, wherein the bypass valve structure is arranged in the sealing plate on one side of the vacuum pump body and is connected between an exhaust cavity and an air inlet cavity of the vacuum pump body; the bypass valve arrangement is openable by exhaust chamber pressure to return gas in the exhaust chamber to the intake chamber.
The bypass valve structure comprises a bypass valve body, a bypass valve core, a spring and a bypass valve cover, wherein an air inlet channel and a valve core mounting hole are arranged in the bypass valve body, one end of the air inlet channel is communicated with the exhaust cavity, and the bypass valve core is arranged in the valve core mounting hole; the bypass valve cover is arranged at the end part of the valve core mounting hole and is in sliding connection with the bypass valve core; the spring is sleeved on the bypass valve core, and two ends of the spring are respectively abutted against the sealing end of the bypass valve core and the bypass valve cover; the bypass valve core seals the air inlet channel under the action of a spring.
The bypass valve core is of a T-shaped structure, the head part of the bypass valve core is a sealing end, and the diameter of the sealing end is larger than that of the air inlet channel.
And a sliding groove in sliding fit with the bypass valve core is arranged in the center of the bypass valve cover.
The spring is a linear spring or a wave spring.
The bypass valve arrangement is disposed proximate the exhaust cavity.
The invention has the advantages and beneficial effects that: the bypass structure is arranged in the sealing plate on one side of the vacuum pump body and the rotor, and when the bypass structure is opened, gas returns to the gas inlet from the gas outlet through the bypass structure, so that the Roots vacuum pump can be started at the same time under atmospheric pressure, the Roots vacuum pump and a backing pump (such as a screw vacuum pump or a claw vacuum pump) can continuously operate at the same time, the gas extraction time can be shortened, and the working efficiency can be improved.
Drawings
FIG. 1 is a schematic diagram of a vacuum pump with a bypass structure according to the present invention;
fig. 2 is a schematic structural view of the bypass structure of the present invention.
In the figure: the structure of the bypass valve is shown as 10, the bypass valve body is shown as 11, the bypass valve core is shown as 12, the spring is shown as 13, the bypass valve cover is shown as 14, the vacuum pump body is shown as 20, the rotor is shown as 30, the sealing plate is shown as 40, and the exhaust port is shown as M.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the vacuum pump with the bypass structure according to the present invention comprises a bypass valve structure 10, a vacuum pump body 20 and a sealing plate 40, wherein the bypass valve structure 10 is installed in the vacuum pump body 20 and the sealing plate 40 on the rotor 30 side, and is connected between an exhaust cavity and an intake cavity of the vacuum pump body 20; the bypass valve arrangement 10 is openable by exhaust chamber pressure and when the bypass valve arrangement 10 is opened, gas is returned from the exhaust chamber to the intake chamber through the bypass valve arrangement 10 to equalise the gas pressures in the exhaust and intake chambers.
In an embodiment of the present invention, the bypass valve structure 10 is disposed adjacent to an exhaust chamber, the bottom of which is provided with an exhaust port M.
As shown in fig. 2, in the embodiment of the present invention, the bypass valve structure 10 includes a bypass valve body 11, a bypass valve core 12, a spring 13 and a bypass valve cover 14, wherein an air intake channel and a valve core mounting hole are arranged in the bypass valve body 11, one end of the air intake channel is communicated with an air exhaust cavity, and the bypass valve core 12 is arranged in the valve core mounting hole; the bypass valve cover 14 is provided at an end of the valve body mounting hole and fixed to the bypass valve body 11. One end of the bypass valve core 12 is slidably connected with the bypass valve cover 14, the spring 13 is sleeved on the bypass valve core 12, and the two ends of the spring are respectively abutted against the other end of the bypass valve core 12 and the bypass valve cover 14; the bypass spool 12 seals the intake passage by the action of the spring 13.
In this embodiment, the bypass valve core 12 is a T-shaped structure, and the head is a sealing end, the diameter of the sealing end is larger than that of the air inlet channel, and the sealing end abuts against the port of the air inlet channel to seal the air inlet channel.
In this embodiment, the bypass valve cover 14 is a T-shaped structure, and a sliding slot slidably engaged with the bypass valve core 12 is disposed in the center. The spring 13 is a linear spring or a wave spring, but may be other types of springs. One end of the spring 13 is sleeved on the central bulge of the bypass valve cover 14, and the other end of the spring is abutted against the sealing end of the bypass valve core 12. In the closed state of the bypass valve structure 10, the sealed end of the bypass valve body 12 and the intake passage port are in close contact with each other, and the sealed state is maintained.
According to the vacuum pump with the bypass structure, when the pressure difference between the air inlet and the air outlet of the vacuum pump is overlarge, the bypass valve structure 10 is automatically opened through air pressure, and part of air at the air outlet returns to the air inlet, so that the vacuum pump is protected. The force value of the spring 13 at the working height corresponds to the pressure value at which the bypass valve is opened/closed. When the gas pressure difference on the two sides of the bypass valve core 12 is larger than the force value of the spring at the moment, the spring 13 is compressed, the bypass valve core 12 is opened, and gas enters the air inlet of the vacuum pump through the bypass valve.
The bypass valve body is added in the vacuum pump, in particular to a roots vacuum pump, so that the roots vacuum pump can be started at the same time under the atmospheric pressure, the roots vacuum pump and a backing pump (such as a screw vacuum pump or a claw vacuum pump) can be continuously operated at the same time, and the air extraction time can be shortened.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, extension, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (6)
1. A vacuum pump with a bypass structure is characterized by comprising a bypass valve structure (10), a vacuum pump body (20) and a sealing plate (40), wherein the bypass valve structure (10) is arranged in the sealing plate (40) on one side of the vacuum pump body (20) and is connected between an exhaust cavity and an air inlet cavity of the vacuum pump body (20); the bypass valve arrangement (10) is openable by exhaust chamber pressure to return gas in the exhaust chamber to the inlet chamber.
2. The vacuum pump with the bypass structure according to claim 1, wherein the bypass valve structure (10) comprises a bypass valve body (11), a bypass valve core (12), a spring (13) and a bypass valve cover (14), wherein an air inlet channel and a valve core mounting hole are arranged in the bypass valve body (11), one end of the air inlet channel is communicated with the exhaust cavity, and the bypass valve core (12) is arranged in the valve core mounting hole; the bypass valve cover (14) is arranged at the end part of the valve core mounting hole and is in sliding connection with the bypass valve core (12); the spring (13) is sleeved on the bypass valve core (12), and two ends of the spring are respectively abutted against the sealing end of the bypass valve core (12) and the bypass valve cover (14); the bypass valve core (12) seals the air inlet channel under the action of a spring (13).
3. A vacuum pump with a bypass arrangement according to claim 2, characterized in that the bypass spool (12) is of T-shaped configuration and the head is a sealed end having a diameter greater than the diameter of the inlet channel.
4. The vacuum pump with the bypass structure according to claim 2, wherein the center of the bypass valve cover (14) is provided with a slide groove in sliding fit with the bypass valve core (12).
5. Vacuum pump with bypass arrangement according to claim 2, characterized in that the spring (13) is a linear spring or a wave spring.
6. A vacuum pump with a bypass arrangement according to claim 2, characterized in that the bypass valve arrangement (10) is arranged close to the exhaust chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011407804.5A CN114593063A (en) | 2020-12-04 | 2020-12-04 | Vacuum pump with bypass structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011407804.5A CN114593063A (en) | 2020-12-04 | 2020-12-04 | Vacuum pump with bypass structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114593063A true CN114593063A (en) | 2022-06-07 |
Family
ID=81812111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011407804.5A Pending CN114593063A (en) | 2020-12-04 | 2020-12-04 | Vacuum pump with bypass structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114593063A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4639199A (en) * | 1983-04-02 | 1987-01-27 | Leybold-Heraeus Gmbh | Two-shaft vacuum pump with internal compression |
| CN102979730A (en) * | 2012-10-26 | 2013-03-20 | 南通龙鹰真空泵业有限公司 | Roots pump |
| CN103939353A (en) * | 2014-03-21 | 2014-07-23 | 南通龙鹰真空泵业有限公司 | Noise reducing roots vacuum pump |
| CN211819901U (en) * | 2020-03-18 | 2020-10-30 | 淄博华中真空设备有限公司 | Roots pump bypass device convenient to dismouting |
-
2020
- 2020-12-04 CN CN202011407804.5A patent/CN114593063A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4639199A (en) * | 1983-04-02 | 1987-01-27 | Leybold-Heraeus Gmbh | Two-shaft vacuum pump with internal compression |
| CN102979730A (en) * | 2012-10-26 | 2013-03-20 | 南通龙鹰真空泵业有限公司 | Roots pump |
| CN103939353A (en) * | 2014-03-21 | 2014-07-23 | 南通龙鹰真空泵业有限公司 | Noise reducing roots vacuum pump |
| CN211819901U (en) * | 2020-03-18 | 2020-10-30 | 淄博华中真空设备有限公司 | Roots pump bypass device convenient to dismouting |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220607 |