CN2036217U - Low-fluctuation and low-noise gear pump - Google Patents
Low-fluctuation and low-noise gear pump Download PDFInfo
- Publication number
- CN2036217U CN2036217U CN 88208856 CN88208856U CN2036217U CN 2036217 U CN2036217 U CN 2036217U CN 88208856 CN88208856 CN 88208856 CN 88208856 U CN88208856 U CN 88208856U CN 2036217 U CN2036217 U CN 2036217U
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- CN
- China
- Prior art keywords
- gear pump
- low
- pump
- gear
- end cover
- 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.)
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- Details And Applications Of Rotary Liquid Pumps (AREA)
- Rotary Pumps (AREA)
Abstract
The utility model relates to a low-fluctuation and low-noise gear pump, comprising a rear end cover, a pump body and a front end cover. The utility model is characterized in that the oil outlet of the gear pump is provided with a cavity with the K type filter construction; on one hand, when hydraulic oil passes the K type filter, the components of the flow pulsation of the gear pump which is higher than the cut off frequency of the filter are filtered off; on the other hand, after the filter is arranged on the gear pump, the inner impedance decreases, which makes the pressure pulsation reduces; more than that after the inner structure of the gear pump is changed, the noises of the gear pump obviously decrease.
Description
The utility model belongs to gear pump class field.
Existing low pressure gear pump all is the three pieces type structure.Promptly partly form one by front cover, the pump housing and rear end cover three, gear is loaded among the pump housing, and driving shaft rotates under driven by motor, utilize key that gear is rotated, when this during to gear movement, one side of gear drop out of gear (oil sucting cavity) since volume increase, produce vacuum, suck liquid.The liquid that is full of between cog is brought to oil-discharging cavity along shell inner surface, at oil-discharging cavity, gear engagement, the chamber internal volume is reduced, liquid is discharged, along with the gear rotation, tooth enters engagement successively, oil sucting cavity periodically changes from small to big, oil-discharging cavity periodically from large to small, so gear pump just can constantly suck and drain.Because the cyclically-varying of pump oil extraction volume size makes the flow of pump produce pulsation, by hindrance function, causes pressure pulsation, makes the system works instability.Moreover, for guaranteeing the stable gear ground engagement running of gear pump, inhale, pumping cavity strictly seals and even and continuously fuel feeding, must make overlap coefficient ε＞1 of gear engagement, therefore, last to gear not before the disengage from, a pair of gear in back has entered engagement, and having formed a dead volume between two pairs of gears is the pocketed oil district.When gear rotates, dead volume from large to small, and hydraulic oil is incompressible liquid, so the time pocketed oil district pressure sharply raise, make axle and bearing be subjected to great impact load, cause vibration and noise, when dead volume changed from small to big, pressure is fierce again to descend, and forms vacuum, produce steam bubble, cause harm (how document 1 " hydraulic element " deposits emerging Huazhong Institute of Technology) such as cavitation, vibration, noise.
At present, similar with principle of the present utility model, the method that reduces the pump outlet pressure pulsation is to add a wave filter (document 2 " hydraulic filter " Cao grasps firm history dimension auspicious " hydraulic pressure and pneumatic " the 3rd phase in 1986) between pump and system.Add a wave filter in system, for pump, load impedance changes, and makes that the pressure pulsation before the wave filter reduces.In addition, fluid is when the wave filter, because wave filter is a low-pass filter, high fdrequency component is filtered, and the pressure pulsation behind the wave filter is just littler, and then noise also reduces, but this method also has deficiency.At first, this method makes the wave filter volume very big, is unwell to simple in structure, compact system; Secondly, this method is not to set about from solving the root that produces pressure pulsation and noise, but reaches the purpose that reduces pulsation, reduces noise by improving external condition, and the pulsation of pump itself and noiseproof feature do not improve.
The purpose of this utility model is a kind of gear pump that the pump internal structure is strobed of design, simultaneously, changes the gear pump internal driving, makes gear pump have low pulsation, low noise characteristics.
The oil outlet place of the utility model gear pump has offered a cavity volume with K mode filter structure.On the one hand, after hydraulic oil was through the K mode filter, the component that the flow pulsation of gear pump is higher than filter cutoff frequency fc was then filtered; On the other hand, behind the adding wave filter, internal driving reduces in the gear pump, thereby the pressure pulsation of gear pump is reduced, and noise reduces.
Accompanying drawing 1 is a structural drawing of the present utility model.
Accompanying drawing 2 is structural drawing of rear end cover of the present utility model.
In the accompanying drawing, (1) is that rear end cover, (2) are that the pump housing, (3) are that front cover, (B) are that filler opening, (C) are that oil drain out, (E) are the oil outlets of rear end cover (1).The utility model is under all constant situation of the pump housing (2), front cover (3) and other part, behind the oil outlet (E) of rear end cover (1), offer a cavity volume (D) with K mode filter structure, after filler opening (B) sucks hydraulic oil, hydraulic oil takes the pumping cavity of gear to through gear, push away from the F direction then, hydraulic oil enters the cavity volume (D) from oil outlet (E), the component that the flow pulsation of gear pump is higher than filter cutoff frequency fc is then filtered, and hydraulic oil is discharged to the system from the F direction by oil drain out (C) then; On the other hand, after the gear pump adding had the cavity volume (D) of K mode filter structure, internal driving reduced, thereby the pressure pulsation of gear pump is reduced, and noise reduces.
Utilize the principle of the utility model structure, on plunger pump, vane pump, offer cavity volume, also can reach the purpose that reduces pulsation, reduces noise with K mode filter structure.
The CB-B32 type gear pump with the utility model structure after the improvement is in the situation of 25 bar in rated pressure, and the gear pump pulsation reduces by 32%, reducing noise 9.6%.
Claims (2)
1, a kind of low pulsation, low noise gear pump, form by rear end cover (1), the pump housing (2), front cover (3), have filler opening (B) and oil drain out (C) on the gear pump, have oil outlet (E) on the rear end cover (1), feature of the present utility model is to have a cavity volume (D) behind the oil outlet (E) of rear end cover (1).
2, low pulsation according to claim 1, low noise gear pump is characterized in that, said cavity volume (D) is the cavity volume with K mode filter structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88208856 CN2036217U (en) | 1988-07-28 | 1988-07-28 | Low-fluctuation and low-noise gear pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88208856 CN2036217U (en) | 1988-07-28 | 1988-07-28 | Low-fluctuation and low-noise gear pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2036217U true CN2036217U (en) | 1989-04-19 |
Family
ID=4842596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88208856 Withdrawn CN2036217U (en) | 1988-07-28 | 1988-07-28 | Low-fluctuation and low-noise gear pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2036217U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101517235B (en) * | 2006-09-28 | 2012-10-10 | 罗伯特·博世有限公司 | Gear pump with reduced pressure impulses on the conveyor side |
| CN105673482A (en) * | 2016-03-16 | 2016-06-15 | 哈尔滨宏万智科技开发有限公司 | Left and right end covers for gear oil pump with double transmission gear shafts |
-
1988
- 1988-07-28 CN CN 88208856 patent/CN2036217U/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101517235B (en) * | 2006-09-28 | 2012-10-10 | 罗伯特·博世有限公司 | Gear pump with reduced pressure impulses on the conveyor side |
| CN105673482A (en) * | 2016-03-16 | 2016-06-15 | 哈尔滨宏万智科技开发有限公司 | Left and right end covers for gear oil pump with double transmission gear shafts |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |