CN2835720Y - Dual-spring electro-hydraulic valve - Google Patents
Dual-spring electro-hydraulic valve Download PDFInfo
- Publication number
- CN2835720Y CN2835720Y CN 200520077755 CN200520077755U CN2835720Y CN 2835720 Y CN2835720 Y CN 2835720Y CN 200520077755 CN200520077755 CN 200520077755 CN 200520077755 U CN200520077755 U CN 200520077755U CN 2835720 Y CN2835720 Y CN 2835720Y
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- Prior art keywords
- spring
- valve
- hydraulic valve
- electro hydraulic
- dual
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Abstract
The utility model relates to a dual spring electrohydraulic valve. A valve which is composed of a valve core and a spring is arranged in a valve body, the valve core comprises an O-shaped ring, a film sheet, a guide rod, a bowl pad, a shim, a plug lid and a plug block, and the spring is arranged on the guide rod of the valve core. The utility model is characterized in that the spring is provided with a sealing spring and a controlling spring, wherein in the still state of the electrohydraulic valve, the natural length of the sealing spring is larger than the reserved space at the mounting position in the valve, and in the still state of the electrohydraulic valve, the length of the controlling spring is equal to or a little smaller than the reserved space. In an optimized scheme, the rotation direction of two springs is opposite, and spring force of the controlling spring is greater than that of the sealing spring. A structure design of the utility model enables the electrohydraulic valve to reach the purposes that response speed is quick, seal is reliable, and control precision is high under the situation that flow resistance is smaller.
Description
Technical field
The utility model relates to a kind of electro hydraulic valve, is specifically related to a kind of dual spring electro hydraulic valve.
Background technique
The structure of traditional electro hydraulic valve of the prior art is: spool and spring are installed in valve body constitute valve, spool comprises O shape circle, diaphragm, guide rod, bowl pad, pad, gag and chock.The spool guide rod is provided with spring, and this spring is served as Packing spring and control spring simultaneously, so can cause following problem:
Mainly by spring sealed, for reliable sealing, spring force must be bigger when 1, electro hydraulic valve was static.Require the main valve speed of response fast when dynamically closing, also need bigger spring force.And the unlatching of electro hydraulic valve is a tube road medium pressure, in order to reduce the pressure loss, requires valve flow resistance as far as possible little (being that spring force is little).Normally in order to improve the main valve speed of response, to guarantee sealing and spring is strengthened, the flow resistance of valve is increased, thereby increased the pressure loss at present.
2, because spring force is bigger, make the control characteristic variation of electro hydraulic valve, control accuracy reduces.When loine pressure is low, also easily cause electro hydraulic valve can't open or aperture very little.
Have one " dead band " in the starting stage of unlatching and the final stage of closing during 3, owing to the control of electro hydraulic valve multistage, main valve is uncontrollable in this section stroke.Bigger spring force can make " dead band " to increase.
Summary of the invention
At prior art in above-mentioned deficiency, task of the present utility model is that the structure to traditional electro hydraulic valve makes improvements, new structure will overcome reliable sealing and closing velocity requires spring force big soon, require the little contradiction of spring force during with unlatching, solve simultaneously because the control characteristic variation of the electro hydraulic valve that spring force causes greatly, control accuracy reduces, and " dead band " problem that exists with the final stage of closing in the starting stage of opening.
The technological scheme of finishing the foregoing invention task is: the dual spring electro hydraulic valve, spool and spring are installed in valve body constitute valve, described spool comprises O shape circle, diaphragm, guide rod, bowl pad, pad, gag and chock, described spring is arranged on the guide rod of spool, it is characterized in that, described spring is provided with two, and one is Packing spring: in the state of rest of electro hydraulic valve, the natural length of sealing spring is greater than the headspace of mounting point in the valve; Another is a control spring, and in the state of rest of electro hydraulic valve, the length of this control spring is equal to or slightly less than headspace.
Above-described " natural length of Packing spring is greater than the headspace of mounting point in the valve " is meant: when mounted, at state of rest, the spring of electro hydraulic valve compression is to a certain degree arranged promptly.
Described " natural length of control spring is equal to or slightly less than headspace " is meant: when mounted, be relaxed state at state of rest, this control spring of electro hydraulic valve, do not have any compression.
During actual design, the spring force of the spring that the utility model adopts should be less than the spring force of traditional electro hydraulic valve; But the spring force of two spring additions, can equal/greater than the spring force of traditional electro hydraulic valve.
The working principle of the utility model structure and advantage:
When electro hydraulic valve was static, control spring was inoperative, and only Packing spring works.Like this, Packing spring only need satisfy seal request and get final product, and need not consider the main valve speed of response, thereby required spring force is just less, and the flow resistance of valve is just little, has reduced pressure loss in piping.
When valve open, main valve overcomes Packing spring under the pressure medium effect pressure moves upward.Five of full gate/for the moment, control spring begins compression, opens fully until main valve when main valve continues to be opened to.
When valve began to close, control spring and Packing spring worked simultaneously, made speeding up that main valve moves downward, and had improved the speed of response of main valve.When main valve continue to close full gate 4/5ths the time, control spring no longer works, only by Packing spring separately effect close fully until main valve.
Because have one " dead band " in the starting stage of opening with the final stage of closing during the control of electro hydraulic valve multistage, main valve is uncontrollable in this section stroke.This structural design has adopted the method that reduces spring force that this " dead band " diminished, thereby has improved control accuracy.
Further improvement of the utility model can have following optimized project:
1, the rotation direction of described two springs is opposite.
2, the spring force of described control spring is greater than the spring force (generally can adopt thicker spring as control spring, and Packing spring being thinner relatively) of Packing spring.
Two spring rotation directions are in order to guarantee the concentric relation of two springs, to prevent that inside and outside spring from producing crooked phenomenon on the contrary.
In sum, this structural design can make electro hydraulic valve be issued to the purpose that speed of response is fast, sealing is reliable, control accuracy is high in the less situation of flow resistance.
Description of drawings
Fig. 1 is the structural representation of traditional electro hydraulic valve;
Structural representation when Fig. 2 is the electro hydraulic valve static state;
Structural representation when Fig. 3 is the electro hydraulic valve motion state.
Embodiment
Embodiment 1, the dual spring electro hydraulic valve, and with reference to Fig. 2, Fig. 3: gag 32 and chock 33 are installed on the guide rod on the valve seat 34 20, constitute valve, be coaxially arranged with two springs with gag 32, chock 33: one is thinner Packing spring 25; In the state of rest of electro hydraulic valve, the natural length of sealing spring is greater than the headspace of mounting point in the valve; When mounted, state of rest, the spring at electro hydraulic valve promptly has compression to a certain degree.Another is thicker control spring 24, and in the state of rest of electro hydraulic valve, the length of this control spring is equal to or slightly less than headspace.When mounted, be relaxed state, do not have any compression at state of rest, this control spring of electro hydraulic valve.When electro hydraulic valve was static, control spring was inoperative, and only Packing spring works, and required spring force is less, and the flow resistance of valve is just little, has reduced pressure loss in piping.When valve open, main valve overcomes Packing spring under the pressure medium effect pressure moves upward.Five of full gate/for the moment, control spring begins compression, opens fully until main valve when main valve continues to be opened to.
When valve began to close, control spring and Packing spring worked simultaneously, made speeding up that main valve moves downward.When main valve continue to close full gate 4/5ths the time, control spring no longer works, only by Packing spring separately effect close fully until main valve.
Among the figure 29 is axle sleeve, and 21 is nut, and 22 is dentiform gasket, and 26 is last bowl pad, and 27 is diaphragm, and 28 are following bowl of pad, and 29 is pad, and 30 is packing ring, and 31 is O type circle.
Claims (3)
1, a kind of dual spring electro hydraulic valve, spool and spring are installed in valve body constitute valve, described spool comprises O shape circle, diaphragm, guide rod, bowl pad, pad, gag and chock, described spring is arranged on the guide rod of spool, it is characterized in that, described spring is provided with two, and one is Packing spring: in the state of rest of electro hydraulic valve, the natural length of sealing spring is greater than the headspace of mounting point in the valve; Another is a control spring, and in the state of rest of electro hydraulic valve, the length of this control spring is equal to or slightly less than headspace.
2, according to the described dual spring electro hydraulic valve of claim 1, it is characterized in that the rotation direction of described two springs is opposite.
3, according to claim 1 or 2 described dual spring electro hydraulic valves, it is characterized in that the spring force of described control spring is greater than the spring force of Packing spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520077755 CN2835720Y (en) | 2005-11-18 | 2005-11-18 | Dual-spring electro-hydraulic valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520077755 CN2835720Y (en) | 2005-11-18 | 2005-11-18 | Dual-spring electro-hydraulic valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2835720Y true CN2835720Y (en) | 2006-11-08 |
Family
ID=37300374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520077755 Expired - Fee Related CN2835720Y (en) | 2005-11-18 | 2005-11-18 | Dual-spring electro-hydraulic valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2835720Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102313025A (en) * | 2011-09-14 | 2012-01-11 | 刘工勤 | Hydraulic control switch valve |
| CN101504018B (en) * | 2009-03-13 | 2013-10-02 | 湖州生力液压有限公司 | Lifting and steering hydraulic integrated valve with manual convenience |
-
2005
- 2005-11-18 CN CN 200520077755 patent/CN2835720Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101504018B (en) * | 2009-03-13 | 2013-10-02 | 湖州生力液压有限公司 | Lifting and steering hydraulic integrated valve with manual convenience |
| CN102313025A (en) * | 2011-09-14 | 2012-01-11 | 刘工勤 | Hydraulic control switch valve |
| CN102313025B (en) * | 2011-09-14 | 2013-07-03 | 刘工勤 | Hydraulic control switch valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |
Granted publication date: 20061108 Termination date: 20101118 |