CN203476699U - Oil-trapping-free gear pump - Google Patents
Oil-trapping-free gear pump Download PDFInfo
- Publication number
- CN203476699U CN203476699U CN201320480943.XU CN201320480943U CN203476699U CN 203476699 U CN203476699 U CN 203476699U CN 201320480943 U CN201320480943 U CN 201320480943U CN 203476699 U CN203476699 U CN 203476699U
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- China
- Prior art keywords
- gear
- oil
- gear pump
- driven
- pump
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Abstract
The utility model relates to an oil-trapping-free gear pump, which comprises a shell, a driving gear and a driven gear, wherein the driving gear and the driven gear are arranged in the shell and engaged with each other, a driving shaft is sleeved with the driving gear, a driven shaft is sleeved with the driven gear, two end cover plates of the gear pump are respectively provided with a pair of isosceles right-angled trapezoid unloading grooves, and the root of each gear is provided with a U-shaped groove. Through the U-shaped groove, when the pressure in an oil trapping area is increased, a resilient member is retracted, the cover plates are driven to close the groove, so that the pressure in the oil trapping area is reduced; when the pressure in the oil trapping area is decreased, the resilient member is resilient naturally, the cover plates are opened, oil enters, the cavitation can be avoided, and the vibration and air erosion phenomena can be reduced; and meanwhile through the isosceles right-angled trapezoid unloading grooves, the oil trapping phenomenon can be further eliminated.
Description
Technical field
The utility model relates to a kind of pump, relates in particular to a kind of without pocketed oil gear pump.
Background technique
Gear pump is to rely on formed swept volume between pumping cylinder and engaging gear to change and the mobile rotary pump of carrying liquid or making it supercharging.By two gears, the pump housing and front and rear covers, form two enclosed spaces, when gear rotates, the volume in the space of the side that is out of gear is large from little change, forms vacuum, and liquid is sucked, and the volume in the space of gear engagement side is from diminishing greatly, and liquid is clamp-oned in pipeline and gone.Suction chamber and discharge side are to lean on the line of contact of two gears to separate.The pressure of the exhaust port of gear pump depends on the size that pumps place's resistance completely.
In order to make stable gear running, suction oil pocket should strictly seal and continuous uniform ground fuel feeding, according to the theory of engagement of gear, must make the overlap coefficient ε > 1 of gear, when gear pump is worked, occur that sometimes two pairs of gear teeth mesh simultaneously, within being therefore trapped in two pairs of formed sealing cavity volumes of the gear teeth with regard to some fluid, this sealing cavity volume first rotates and reduces gradually with the gear teeth, increases gradually again later.The reducing of sealing cavity volume can make trapped fluid be squeezed and cause pressure sharply to raise, and is extruded away from gap, causes fluid heating, and the parts such as bearing are also subject to additional unbalanced load; The increase of sealing cavity volume can cause parital vacuum again, and the gas that makes to be dissolved in fluid is separated, and produces air pocket.Because entrap phenomenon causes gear pump to produce strong noise and causes vibrations and cavitation erosion, reduce the volumetric efficiency of pump, affect stable working, reduction of service life.
Model utility content
The purpose of this utility model is in order to overcome the deficiencies in the prior art, provides a kind of without pocketed oil gear pump.
The utility model is to be achieved through the following technical solutions:
A kind of without pocketed oil gear pump, comprise housing and be located at driving gear in housing, intermeshing and driven gear, described driving gear is socketed on driving shaft, described driven gear is socketed on driven shaft, on the two end cover plate of gear pump, open a pair of isosceles right-angled trapezium compensating groove, in the tooth root portion of each gear teeth, have " U " shape groove.
Further, described " U " shape groove bottom connects one end of elastic component, and the other end of elastic component connects cover plate.
Further, described isosceles right-angled trapezium compensating groove does not directly communicate with gear pump pumping cavity.
Compared with prior art, the beneficial effects of the utility model are: when the utility model raises by " U " connected in star ，Dang pocketed oil district pressure is set, elastic component shrinks, and drives cover plate that groove is sealed to ，Shi pocketed oil district pressure decreased; When pocketed oil district pressure reduces, the resilience of elastic component nature, opens cover plate, and fluid enters, and avoids producing air pocket, reduces the generation of vibrations and cavitation phenomenon; Isosceles right-angled trapezium compensating groove is set simultaneously, further eliminates entrap phenomenon.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the enlarged view of A part in Fig. 1.
Embodiment
In order to make the purpose of this utility model, technological scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Refer to Fig. 1 and Fig. 2, Fig. 1 is structural representation of the present utility model, and Fig. 2 is the enlarged view of A part in Fig. 1.
Described a kind of without pocketed oil gear pump, comprise housing 1 and be located at driving gear 2 in housing 1, intermeshing and driven gear 3, described driving gear 2 is socketed on driving shaft, described driven gear 3 is socketed on driven shaft, on the two end cover plate of gear pump, open a pair of isosceles right-angled trapezium compensating groove 4, in the tooth root portion of each gear teeth, have " U " shape groove 5.
Described " U " shape groove 5 bottoms connect one end of elastic component 7, and the other end of elastic component 7 connects cover plate 6.When pocketed oil district pressure raises, elastic component 7 shrinks, and drives cover plate 6 by groove 5 sealing ，Shi pocketed oil district pressure decreaseds; When pocketed oil district pressure reduces, the natural resilience of elastic component 7, opens cover plate 6, and fluid enters, and avoids producing air pocket, reduces the generation of vibrations and cavitation phenomenon.
Described isosceles right-angled trapezium compensating groove 4 does not directly communicate with gear pump pumping cavity.When enclosed volume reduces, compensating groove 4 is communicated with hyperbaric chamber to the fluid of enclosed volume is discharged in pumping cavity, when enclosed volume increases, compensating groove 4 is communicated with oil sucting cavity, the oil subsidy of oil sucting cavity is entered, avoid producing vacuum.
When gear pump rotates by direction as shown, the gear teeth on right side depart from engagement gradually, and its sealed volume increases gradually, form parital vacuum, and fluid enters right part low-pressure cavity from inlet port under the effect of atmospheric pressure; Along with the rotation of gear, the tooth paddy of gear is taken fluid the sealed volume of left side to from right side, when the gear teeth enter engagement in left side, left side sealed volume is reduced gradually, and fluid is discharged fluid by hyperbaric chamber from left side.When gear pump constantly rotates, the continuous oil suction of gear pump and oil extraction, often circle, and the equal topping up of each tooth paddy and discharge opeing are respectively once.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.
Claims (3)
1. one kind without pocketed oil gear pump, comprise housing (1) and be located in housing (1), intermeshing driving gear (2) and driven gear (3), described driving gear (2) is socketed on driving shaft, described driven gear (3) is socketed on driven shaft, it is characterized in that, on the two end cover plate of gear pump, open a pair of isosceles right-angled trapezium compensating groove (4), in the tooth root portion of each gear teeth, have " U " shape groove (5).
2. according to claim 1 a kind ofly it is characterized in that without pocketed oil gear pump, described " U " shape groove (5) bottom connects one end of elastic component (7), and the other end of elastic component (7) connects cover plate (6).
3. according to claim 1 a kind ofly it is characterized in that without pocketed oil gear pump, described isosceles right-angled trapezium compensating groove (4) does not directly communicate with gear pump pumping cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320480943.XU CN203476699U (en) | 2013-08-08 | 2013-08-08 | Oil-trapping-free gear pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320480943.XU CN203476699U (en) | 2013-08-08 | 2013-08-08 | Oil-trapping-free gear pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203476699U true CN203476699U (en) | 2014-03-12 |
Family
ID=50225038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320480943.XU Expired - Fee Related CN203476699U (en) | 2013-08-08 | 2013-08-08 | Oil-trapping-free gear pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203476699U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109356846A (en) * | 2018-10-09 | 2019-02-19 | 宿迁学院 | A kind of combination unloading-structure for pocketed oil |
| CN111997894A (en) * | 2020-09-10 | 2020-11-27 | 康斯克泵业(苏州)有限公司 | Gear pump convenient for optimizing set position of unloading groove |
-
2013
- 2013-08-08 CN CN201320480943.XU patent/CN203476699U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109356846A (en) * | 2018-10-09 | 2019-02-19 | 宿迁学院 | A kind of combination unloading-structure for pocketed oil |
| CN109356846B (en) * | 2018-10-09 | 2023-08-29 | 宿迁学院 | Combined unloading structure for trapped oil |
| CN111997894A (en) * | 2020-09-10 | 2020-11-27 | 康斯克泵业(苏州)有限公司 | Gear pump convenient for optimizing set position of unloading groove |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140312 Termination date: 20150808 |
|
| EXPY | Termination of patent right or utility model |