CN109458335B - Noise reduction structure of rotary vane vacuum pump - Google Patents
Noise reduction structure of rotary vane vacuum pump Download PDFInfo
- Publication number
- CN109458335B CN109458335B CN201811115644.XA CN201811115644A CN109458335B CN 109458335 B CN109458335 B CN 109458335B CN 201811115644 A CN201811115644 A CN 201811115644A CN 109458335 B CN109458335 B CN 109458335B
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- Prior art keywords
- pump
- oil
- aeration
- channel
- rear cover
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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
- 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
- F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
- F04C27/02—Liquid sealing for high-vacuum pumps or for compressors
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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
- F04C29/06—Silencing
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The invention discloses a vacuum pump, provides a noise reduction structure of a rotary vane vacuum pump, which has simple structure, can effectively reduce high-frequency noise generated in extreme vacuum while ensuring the extreme vacuum degree, solves the problem that the vacuum degree and the pumping speed are reduced when the noise is reduced in the prior art, thereby the technical problems that the two indexes of the noise and the ultimate vacuum degree of the vacuum pump can not be balanced, and the like, comprises a pump rear cover, a rear-stage stator and an oil pump cover which are respectively covered on the two sides of the pump rear cover, an oil pump is embedded and fixed in the pump rear cover, an oil inlet of the oil pump is communicated with an oil tank through an oil inlet channel, an oil outlet of the oil pump is communicated with a pump cavity through an oil outlet channel, the oil inlet channel is communicated with one end of the aeration channel, the other end of the aeration channel extends out of the pump rear cover, the outlet end of the aeration channel corresponding to the pump back cover is provided with an aeration joint with an aeration through hole, and the oil discharge channel is provided with an overflow hole communicated with the outside of the pump back cover.
Description
Technical Field
The invention relates to a vacuum pump, in particular to a noise reduction structure of a rotary vane vacuum pump, which has a simple structure and can effectively reduce high-frequency noise generated in extreme vacuum while ensuring the extreme vacuum degree.
Background
Because of the existence of the oil hammer effect, the oil seal type rotary vane vacuum pump can generate high-frequency noise in the limit vacuum, so that the overall noise of the vacuum pump is increased. In order to reduce the high-frequency noise of the vacuum pump, the conventional method generally controls the noise of the vacuum pump by controlling the oil amount entering the pump cavity, but the vacuum degree and the pumping speed are generally reduced, and the noise of the vacuum pump is reduced by a gas ballast structure in a use occasion with low requirement on the vacuum degree, at the moment, the ultimate vacuum degree of the vacuum pump is greatly reduced, but two indexes of the noise and the ultimate vacuum degree cannot be balanced.
Disclosure of Invention
The invention mainly provides a noise reduction structure of a rotary vane vacuum pump, which has a simple structure and can effectively reduce high-frequency noise generated in extreme vacuum while ensuring the extreme vacuum degree, and solves the technical problems that the vacuum degree and the pumping speed are reduced when the noise is reduced, so that two indexes of the noise and the extreme vacuum degree of the vacuum pump cannot be balanced and the like in the prior art.
The technical problem of the invention is mainly solved by the following technical scheme: the utility model provides a structure of making an uproar falls in rotary-vane vacuum pump, covers the back-stage stator and the oil pump cover of dress in the lid both sides behind the pump respectively including the pump, and the lid is embedded to be fixed with the oil pump behind the pump, and the oil inlet of oil pump is being linked together the oil tank through oil feed passageway, and the oil drain port of oil pump is being linked together the pump chamber through oil discharge passageway, the oil feed passageway is being linked together the one end of aerifing passageway, and the other end of aerifing passageway extends to outside the lid behind the pump, covers the aerifing passageway exit end that corresponds behind the pump and is equipped with the aerifing joint of taking the aerifing through-hole, is equipped with the overflow hole that switches on outside. The aeration channel is arranged on an oil inlet channel of the oil pump, the outer port of the aeration channel is also provided with an aeration joint, the aeration joint is provided with an aeration through hole communicated with the aeration channel and the outside of the pump rear cover, when the oil pump runs, the oil pump sucks oil from the oil tank, air enters from the aeration joint, oil and gas mixing is realized after the aeration joint and the aeration joint pass through the oil pump, an oil discharge port of the oil pump is connected with an overflow hole, part of oil-gas mixture is discharged into the oil tank through the overflow hole, the other part of oil-gas mixture is input into a pump cavity of a rear stator through the oil discharge channel, noise can be greatly reduced under the premise of ensuring the limit vacuum degree by adjusting the sizes of the aeration through hole and the overflow hole, the whole structure is simple, and the use state of the rotary vane type vacuum pump is greatly improved.
Preferably, one end of the aeration channel is communicated with the upper part of the middle part of the oil inlet channel, and the other end of the aeration channel extends upwards and is communicated with the outer wall surface of the pump rear cover. When the outer port of the aeration channel is vertically positioned above the outer wall surface of the pump rear cover, the installation of the aeration joint is convenient, and the outer port of the aeration channel can be ensured to be positioned on the oil level of the oil tank, so that the aeration joint can smoothly introduce gas.
Preferably, the aeration connector comprises a cylindrical body, the middle part of the bottom surface of the cylindrical body extends downwards to form a positioning column, the aeration through hole is coaxially connected to the cylindrical body and the positioning column in a penetrating mode, and the positioning column is fixedly screwed on the outlet end of the aeration channel. The aeration joint is screwed and fixed on the outlet end of the aeration channel through the positioning column, and the fixing mode is simple and reliable.
Preferably, an overflow channel is arranged between the overflow hole and the oil pump oil outlet, and the overflow channel is enclosed between the butt joint surfaces of the pump rear cover and the oil pump cover. An overflow channel is arranged between the overflow hole and the oil pump oil outlet and is positioned on the pump body, so that the size of the overflow hole can be conveniently controlled; the overflow channel formed by splicing the pump rear cover and the oil pump cover is processed on one wall surface in a single-side mode, and the overflow channel is easy to process.
The overflow hole may also be located above the oil level of the oil tank, and more preferably, the overflow channel extends downward along the oil discharge port of the oil pump, and the overflow hole is located below the oil level of the oil tank. When the overflow hole is positioned below the oil level of the oil tank, the oil-gas mixture discharged from the overflow hole is directly discharged to the position below the oil level, so that the oil mist phenomenon generated in the discharging process is avoided or reduced, and the pressure of the oil mist trapping device is further reduced.
The diameter of the overflow hole may be equal to the diameter of the overflow channel, and more preferably, the diameter of the overflow hole is smaller than the diameter of the overflow channel. When the drift diameter of the overflow hole is smaller than that of the overflow channel, the overflow channel is convenient to process.
Preferably, the diameter of the aeration through hole is phi 0.2mm to phi 1mm, and the diameter of the overflow hole is phi 0.5mm to phi 5 mm. The aeration through hole and the overflow hole are kept in reasonable sizes, so that the performance of the oil seal type rotary vane vacuum pump can be kept, namely, the high-frequency noise is greatly reduced under the condition of ensuring the ultimate vacuum degree.
Therefore, the noise reduction structure of the rotary vane vacuum pump has the following advantages: the aeration channel is arranged on an oil inlet channel of the oil pump, the aeration joint at the outer end of the aeration channel is provided with an aeration through hole, when the oil pump runs, the oil pump sucks oil from the oil tank, air enters from the aeration joint, the oil pump and the aeration joint realize oil-gas mixing after passing through the oil pump, an oil discharge port of the oil pump is connected with an overflow hole, part of oil-gas mixture is discharged into the oil tank through the overflow hole, the other part of oil-gas mixture is input into a pump cavity of a rear stator through an oil discharge channel, and the size of the aeration through hole and the size of the overflow hole are adjusted to greatly reduce noise of the vacuum pump on the premise of ensuring the ultimate vacuum degree; when the overflow hole is positioned below the oil level of the oil tank, the oil-gas mixture is directly discharged below the oil level, so that the oil mist phenomenon is avoided or reduced.
Description of the drawings:
FIG. 1 is a schematic structural view of a pump rear cover in a noise reduction structure of a rotary vane vacuum pump according to the present invention;
FIG. 2 is a schematic view of a partial structure of a rotary vane vacuum pump according to the present invention;
fig. 3 is a schematic structural view of the oil pump cover of the present invention.
The specific implementation mode is as follows:
the technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b):
as shown in fig. 1 and 2, the noise reduction structure of a rotary vane vacuum pump of the present invention comprises a pump rear cover 1, a rear stator 2 coaxially covering the front side of the pump rear cover 1, and an oil pump cover 3 covering the rear side of the pump rear cover 1, wherein an oil pump 4 is coaxially embedded and fixed on the side of the pump rear cover 1 facing the oil pump cover 3, an oil inlet of the oil pump 4 is communicated with an oil tank through an oil inlet channel 5, an oil outlet 41 of the oil pump 4 is communicated with a pump cavity of the vacuum pump through an oil outlet channel 6, the oil inlet channel 5 and the oil outlet channel 6 can be arranged on the oil pump cover 3 or the pump rear cover 1, or can be spliced on the butt joint surface of the oil pump cover 3 and the pump rear cover 1, the upper part of the middle part of the oil inlet channel 5 is communicated with one end of an aeration channel 7, the other end of the aeration channel 7 vertically extends upward to the outer wall surface of the pump rear cover 1, an aeration joint 8 is coaxially installed at the outlet end of the, an aeration through hole 9 is formed in the middle of the aeration connector 8, two ends of the aeration through hole 9 are communicated with the corresponding oil liquid level outside the aeration channel 7 and the pump rear cover 1, wherein the aeration connector 8 comprises a columnar body 81, the middle of the bottom surface of the columnar body 81 extends downwards in an integrated mode to form a positioning column 82, the aeration through hole 9 is coaxially connected in the middle of the columnar body 81 and the positioning column 82 in a penetrating mode, the positioning column 82 is fixedly screwed at the outlet end of the aeration channel 7, the lower end face of the positioning column 82 flatly abuts against the corresponding groove at the outlet end of the aeration channel 7, and an overflow hole 10 communicated with the outside the pump rear cover 1 is formed in the oil discharge channel 6.
As shown in fig. 3, an overflow channel 11 is connected between the overflow hole 10 and the oil discharge port 41 of the oil pump 4, the drift diameter of the overflow hole 10 is smaller than that of the overflow channel 11, the overflow channel 11 is enclosed between the abutting surfaces of the pump rear cover 1 and the oil pump cover 3, and the overflow channel 11 extends downward along the oil discharge port of the oil pump 4, so that the overflow hole 10 is located below the oil level of the oil tank. The diameter of the aeration through hole 9 is phi 0.5mm, and the diameter of the overflow hole 10 is phi 2mm, so that the vacuum pump is ensured to greatly reduce high-frequency noise under the condition of maintaining the ultimate vacuum degree.
In order to greatly reduce high-frequency noise while maintaining the vacuum pump at the ultimate vacuum degree, the aeration joints 8 of various specifications of diameters can be arranged and used according to actual conditions.
The specific embodiments described herein are merely illustrative of the principles of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (5)
1. The utility model provides a structure of making an uproar falls in rotary-vane vacuum pump, covers lid (1) and covers back-stage stator (2) and oil pump cover (3) of dress in lid (1) both sides behind the pump respectively after the pump, lid (1) embedded installation is fixed with oil pump (4) behind the pump, and the oil inlet of oil pump (4) is being linked together the oil tank through oil feed passageway (5), and oil drain port (41) of oil pump (4) are being linked together the pump chamber of vacuum pump through oil discharge passageway (6), its characterized in that: the oil inlet channel (5) is communicated with one end of the aeration channel (7), the other end of the aeration channel (7) extends out of the pump rear cover (1), an aeration joint (8) with an aeration through hole (9) is arranged at the outlet end of the aeration channel (7) corresponding to the pump rear cover (1), and an overflow hole (10) communicated with the outside of the pump rear cover (1) is arranged on the oil discharge channel (6); an overflow channel (11) is arranged between the overflow hole (10) and an oil discharge port (41) of the oil pump (4), and the overflow channel (11) is enclosed between the butt joint surfaces of the pump rear cover (1) and the oil pump cover (3); the diameter of the aeration through hole (9) is phi 0.2mm to phi 1mm, and the diameter of the overflow hole (10) is phi 0.5mm to phi 5 mm.
2. A noise reduction structure of a rotary vane vacuum pump according to claim 1, characterized in that: one end of the aeration channel (7) is communicated with the upper part of the middle part of the oil inlet channel (5), and the other end of the aeration channel (7) extends upwards and is communicated with the outer wall surface of the pump rear cover (1).
3. A noise reduction structure of a rotary vane vacuum pump according to claim 1 or 2, characterized in that: the aeration connector (8) comprises a columnar body (81), the middle part of the bottom surface of the columnar body (81) extends downwards to form a positioning column (82), the aeration through hole (9) is coaxially connected to the columnar body (81) and the positioning column (82) in a penetrating mode, and the positioning column (82) is connected and fixed to the outlet end of the aeration channel (7) in a rotating mode.
4. A noise reduction structure of a rotary vane vacuum pump according to claim 1, characterized in that: the overflow channel (11) extends downwards along an oil discharge port of the oil pump (4), and the overflow hole (10) is positioned below the oil level of the oil tank.
5. A noise reduction structure of a rotary vane vacuum pump according to claim 1, characterized in that: the drift diameter of the overflow hole (10) is smaller than that of the overflow channel (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811115644.XA CN109458335B (en) | 2018-09-25 | 2018-09-25 | Noise reduction structure of rotary vane vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811115644.XA CN109458335B (en) | 2018-09-25 | 2018-09-25 | Noise reduction structure of rotary vane vacuum pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109458335A CN109458335A (en) | 2019-03-12 |
| CN109458335B true CN109458335B (en) | 2020-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811115644.XA Active CN109458335B (en) | 2018-09-25 | 2018-09-25 | Noise reduction structure of rotary vane vacuum pump |
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| CN (1) | CN109458335B (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH416916A (en) * | 1964-10-08 | 1966-07-15 | Balzers Patent Beteilig Ag | Oil-sealed mechanical rotating vacuum pump |
| CN2052067U (en) * | 1989-02-27 | 1990-01-31 | 刘宏庆 | Direct-connection low-noise vacuum pump |
| FR2666382B1 (en) * | 1990-08-28 | 1992-10-16 | Cit Alcatel | DEVICE FOR PUMPING A GAS BY AN OIL SEAL PUMP AND APPLICATION TO HELIUM LEAK DETECTORS. |
| CN2688932Y (en) * | 2004-01-18 | 2005-03-30 | 吴允叔 | Rotary anti-oil-returning vacuum/compression two-purpose pumps |
| CN204061189U (en) * | 2014-09-03 | 2014-12-31 | 常州市东南电器电机股份有限公司 | A kind of noise reduction assembly of used in new energy vehicles electronic vacuum pump |
| CN108443155B (en) * | 2018-05-25 | 2023-08-08 | 中国石油大学(华东) | Three-cavity sliding vane vacuum pump |
| CN209164099U (en) * | 2018-09-25 | 2019-07-26 | 蒋友荣 | The denoising structure of rotary-vane vaccum pump |
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2018
- 2018-09-25 CN CN201811115644.XA patent/CN109458335B/en active Active
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| CN109458335A (en) | 2019-03-12 |
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Effective date of registration: 20220608 Address after: 317500 No. 5, the third street, East New Area, Wenling City, Taizhou City, Zhejiang Province Patentee after: ZHEJIANG VALUE MECHANICAL & ELECTRICAL PRODUCTS Co.,Ltd. Address before: 317500 Zhejiang Feiyue electromechanical Co., Ltd., south of Jiulong Avenue, Wenling industrial city, Taizhou City, Zhejiang Province Patentee before: Jiang Yourong |