CN201582109U - Flow adjustable screw pump - Google Patents
Flow adjustable screw pump Download PDFInfo
- Publication number
- CN201582109U CN201582109U CN2009201874799U CN200920187479U CN201582109U CN 201582109 U CN201582109 U CN 201582109U CN 2009201874799 U CN2009201874799 U CN 2009201874799U CN 200920187479 U CN200920187479 U CN 200920187479U CN 201582109 U CN201582109 U CN 201582109U
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- CN
- China
- Prior art keywords
- pressure area
- communicated
- hole
- screw pump
- flow
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- 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.)
- Expired - Lifetime
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Abstract
The utility model relates to a flow adjustable screw pump, which is structurally characterized in that a lateral wall of a pump body is provided with a through hole communicating a pump body high-pressure area with a low-pressure area, a cover plate is disposed at the through hole, a U-shaped return duct of the through hole communicating the pump body high-pressure area with the low-pressure area is arranged on the cover plate, one end of the U-shaped return duct is communicated with the high-pressure area while the other end is communicated with the low-pressure area, the low-pressure area side of the U-shaped return duct is communicated with an adjusting hole, and a one-way valve is arranged inside the adjusting hole. The problem of flow adjustment of the screw pump is resolved without affecting a self-suction function of the screw pump, and then the screw pump becomes a 'variable pump' which is adjustable within a certain range, thereby being favorable for simplifying a design of a hydraulic system. In addition, through flow adjustability, shortages that flow of the screw pump is reduced due to abrasion of internal parts after long-term operation can be overcome, thereby prolonging service life of products.
Description
Technical field
The utility model relates to a kind of screw pump.
Background technique
In some hydraulic systems, all need POF accurate, and screw pump is a kind of volume type metering pump, its flow is constant under specific operating mode, existing screw pump does not generally possess flow regulating function, the hidden danger that flow regulating function has perhaps been arranged but existed suction capacity to descend can not satisfy the needs of accurate flow; For addressing this problem, generally all to carry out the adjustment of certain limit to flow, this adjustment can realize by number of ways, mainly contains following several method:
1, by the relief valve in the adjust system with unnecessary flow earial drainage oil sump tank, the constant flow of maintenance system, the method is most widely used, deficiency is to add reflux line and relief valve, has increased manufacture cost;
2, the rotating speed that directly changes oil pump with speed-adjustable motor is regulated, but the method expense is higher;
3, regulate by design discharge controlling device on the oil pump, but when regulation range is too big, can influence the suction capacity of screw pump, cause the screw pump cisco unity malfunction.Therefore, existing flow adjustable structure can only be fine setting (＜10%), is not adjustable flow screw pump truly.
Summary of the invention
Realize the problem of flow regulating function in order to solve screw pump under the prerequisite that does not influence its self-absorption function, the utility model provides a kind of new structure adjustable flow formula screw pump.
Concrete technical solution is as follows:
Adjustable flow formula screw pump comprises the pump housing, active screw rod, driven screw rod, front cover and rear end cover;
On the described pump housing one sidewall, have the through hole that is communicated with pump housing zone of high pressure and low pressure area, be provided with cover plate in described through hole;
Described cover plate is provided with the U-shaped backflow duct that is communicated with pump housing zone of high pressure and low pressure area through hole, and an end in U-shaped backflow duct is being communicated with the zone of high pressure, and the other end is being communicated with low pressure area, and low pressure area one side in U-shaped backflow duct is being communicated with adjustment hole; Be provided with one-way valve in the described adjustment hole.
Described adjustment hole is a tapped hole, and the cooperation of adjustment hole place is provided with adjusting screw; The inner end of described adjusting screw is provided with spring eye, is provided with spring in the described spring eye, and the other end of spring is connecting spool, and described spool cooperates the low pressure area that is positioned at U-shaped backflow duct.
Be arranged with the O RunddichtringO on the described adjusting screw.
Useful technique effect of the present utility model embodies in the following areas:
1, realization is to the adjusting of flow
The utility model has designed flow control valve on the cover plate of screw pump, can carry out certain adjusting to the flow of screw pump, and regulation range can reach 50% of rated flow.
2, solve the suction capacity that reduces or lose screw pump because of Flow-rate adjustment
Because after Flow-rate adjustment, will there be a return flow line, the also corresponding increasing of the opening of this return flow line when regulation range strengthens, when restarting, lose suction capacity easily, the utility model is by following dual mode, the return flow line is opened when work automatically, seal automatically when not working, thereby the suction capacity that guarantees screw pump does not descend.
3, the utility model also can remedy the flow decline that screw pump produces owing to the inner body wearing and tearing by the controllability of flow after long-term work, thereby has prolonged the working life of product.
Description of drawings
Fig. 1 is the utility model structural representation,
Fig. 2 is the partial enlarged drawing of Fig. 1,
Fig. 3 is figure spool closed condition figure.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described by embodiment.
Embodiment:
Referring to Fig. 1, Fig. 2 and Fig. 3, adjustable flow formula screw pump comprises the pump housing 8, active screw rod, driven screw rod, front cover and rear end cover; On the pump housing 8 one sidewalls, have the through hole that is communicated with pump housing zone of high pressure 7 and low pressure area 9, cover plate 5 is installed in this through hole.Cover plate 5 is provided with the U-shaped backflow duct 6 that is communicated with pump housing zone of high pressure and low pressure area through hole, and an end in U-shaped backflow duct 6 is being communicated with zone of high pressure 7, and the other end is being communicated with low pressure area 9, and low pressure area one side in U-shaped backflow duct 6 is being communicated with adjustment hole; Adjustment hole is a tapped hole, and the cooperation of adjustment hole place is equipped with adjusting screw 1.Be set with O RunddichtringO 2 on the adjusting screw 1; Its inner end is provided with spring eye, and spring 3 is housed in the spring eye, and the other end of spring 3 is connecting spool 4, and spool 4 cooperates the low pressure area that is positioned at U-shaped backflow duct 6.Wherein adjusting screw 1, O RunddichtringO 2, spring 3 and spool 4 are formed one-way valve.
During use, regulate the position of the spool 4 of U-shaped backflow duct 6 low pressure areas, one side by rotating adjusting screw 1, realize regulating the size of opening, thereby change discharge in it, final realization is to the adjusting of flow.This one-way valve flow regulator when screw pump is shut down is closed automatically simultaneously, makes its self-priming when restarting unaffected, and the cracking pressure≤0.02MPa of spool, standard-sized sheet pressure are 0.05MPa.
Claims (3)
1. adjustable flow formula screw pump comprises the pump housing, active screw rod, driven screw rod, front cover and rear end cover, it is characterized in that: have the through hole that is communicated with pump housing zone of high pressure and low pressure area on the described pump housing one sidewall, be provided with cover plate in described through hole;
Described cover plate is provided with the U-shaped backflow duct that is communicated with pump housing zone of high pressure and low pressure area through hole, and an end in U-shaped backflow duct is being communicated with the zone of high pressure, and the other end is being communicated with low pressure area, and low pressure area one side in U-shaped backflow duct is being communicated with adjustment hole; Be provided with one-way valve in the described adjustment hole.
2. adjustable flow formula screw pump according to claim 1 is characterized in that: described adjustment hole is a tapped hole, and the cooperation of adjustment hole place is provided with adjusting screw; The inner end of described adjusting screw is provided with spring eye, is provided with spring in the described spring eye, and the other end of spring is connecting spool, and described spool cooperates the low pressure area that is positioned at U-shaped backflow duct.
3. adjustable flow formula screw pump according to claim 2 is characterized in that: be arranged with the O RunddichtringO on the described adjusting screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201874799U CN201582109U (en) | 2009-09-11 | 2009-09-11 | Flow adjustable screw pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201874799U CN201582109U (en) | 2009-09-11 | 2009-09-11 | Flow adjustable screw pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201582109U true CN201582109U (en) | 2010-09-15 |
Family
ID=42724107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201874799U Expired - Lifetime CN201582109U (en) | 2009-09-11 | 2009-09-11 | Flow adjustable screw pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201582109U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103459852A (en) * | 2011-02-10 | 2013-12-18 | 特灵国际有限公司 | Lubricant control valve for screw compressor |
-
2009
- 2009-09-11 CN CN2009201874799U patent/CN201582109U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103459852A (en) * | 2011-02-10 | 2013-12-18 | 特灵国际有限公司 | Lubricant control valve for screw compressor |
| CN103459852B (en) * | 2011-02-10 | 2016-03-30 | 特灵国际有限公司 | For the lubricant control valve of screw compressor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100915 |