CN2253780Y - Pulse width modulation proportional pressure valve - Google Patents
Pulse width modulation proportional pressure valve Download PDFInfo
- Publication number
- CN2253780Y CN2253780Y CN 95227926 CN95227926U CN2253780Y CN 2253780 Y CN2253780 Y CN 2253780Y CN 95227926 CN95227926 CN 95227926 CN 95227926 U CN95227926 U CN 95227926U CN 2253780 Y CN2253780 Y CN 2253780Y
- Authority
- CN
- China
- Prior art keywords
- valve
- spool
- valve body
- control chamber
- pressure
- 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.)
- Expired - Fee Related
Links
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- Servomotors (AREA)
Abstract
The utility model relates to a proportional pressure valve. A valve core is arranged in a valve body, and a spiral linear liquid blocking machine at one end of the valve core is communicated with a (T) channel and a right control cavity respectively. A pulse width modulation two-way normally open high speed digital valve is fixed at the right end of the valve body, and a spiral linear liquid blocking device (12) is communicated with the (T) channel and a left control cavity respectively. Another two spiral linear liquid blocking devices (3), (4) are arranged in the valve body to form a stable and symmetrical bridge type hoop.
Description
The utility model relates to a kind of proportional pressure valve
In existing pilot proportional pressure valve, when pilot pressure surpasses the ouput force of proportion electro-magnet, guide's spool is opened, main valve plug is opened, and pilot pressure is directly proportional with the input voltage (or electric current) of proportion electro-magnet, owing to be open loop control, main valve plug does not have position feedback, the power of surging and spring force have bigger influence to pilot valve and valve core of main valve displacement, and pressure overshoot is bigger, and stability and control accuracy are all relatively poor.
Shortcoming at above-mentioned prior art existence, the utility model provide a kind of with pulsewidth modulation high-speed figure valve (two open usually) as pilot valve, the bridge type return of forming stable symmetry with four scroll linear restrictors, and constitute the ratio pressure valve arrangement of all-hydraulic position closed loop control as the resistance of spool travel feedback liquid with two liquid resistance wherein.
The utility model is implemented by following technical measures, and spool 2 is set in valve body 1, and the scroll linear restrictor device 11 of spool 2 one ends is communicated with T passage and right control chamber 10 respectively.Pulsewidth modulation two drives high-speed figure valve 8 usually and electromagnet 7 utilizes bolt nut to connect with valve body 1.The scroll linear restrictor device 12 of spool 2 the other ends is communicated with T passage and left control chamber 14 respectively.P, T respectively are passage.Also be provided with scroll linear restrictor device 3 and 4 in valve body 1, they are communicated with P passage, left side control chamber 14, the right control chamber 10 respectively, and 6 and 16 is ratio pressure valve core zero adjusting screw, and 15 is stifled for filling in.
Advantage of the present utility model shows as: the quality of (1) pulsewidth modulation high-speed figure valve electromagnet is little, and response is fast, and power consumption is little, can directly export with computer to be connected, and does not need D/A to change and expensive proportional amplifier.(2) two scroll linear restrictor R at employing spool two ends
3And R
4As the feedback liquid resistance of spool travel, constitute all-hydraulic position closed loop control.Stationarity, the linearity and the control accuracy of valve core movement have been improved greatly.And simple in structure, cost is low.(3) the pilot pressure P of two control chambers about
1And P
2Higher, power and the frictional force of therefore surging is little to the influence of spool travel, and spool has very high sensitivity, speed of response, zero stability and hydraulic pressure rigidity.(4) four scroll linear restrictor R
1, R
2, R
3And R
4Form symmetrical bridge type return and offset the influence that oil supply pressure changes, eliminated the influence that working medium viscosity that temperature change causes changes.(5) by fine setting spool zero adjusting screw, the zero point that can adjust spool easily.The spring at two ends automatically resets spool during power failure.(6) liquid resistance device and high-speed figure valve are difficult for stopping up, and contamination resistance is strong.The pressure P of (7) two control chambers
1And P
2Higher, help overcoming the influence of the power of surging and frictional dead to spool travel.Therefore, this proportional pressure valve can be used for the hydraulic system of working medium for oil and water.
Description of drawings is as follows:
Accompanying drawing 1 pulsewidth modulation proportional pressure valve structure principle chart.
It is as follows that the utility model is described in further detail in conjunction with the accompanying drawings:
Spool 2 in the valve body 1, the scroll linear restrictor device 11 of its end is communicated with T passage and the right control chamber 10 respectively, pulsewidth modulation two drives high-speed figure valve 8 usually and electromagnet 7 utilizes bolt nut to connect with valve body 1, the scroll linear restrictor device 12 of spool 2 the other ends is communicated with T passage and left side control chamber respectively, spring 9 and 13 is a valve core reseting spring, and P, T respectively are passage.Also be provided with scroll linear restrictor device 3 and 4 in valve body 1, they are communicated with P passage, left side control chamber 14, the right control chamber 10 respectively, and 6 and 16 is ratio pressure valve core zero adjusting screw.Working procedure of the present utility model is as follows: drive the high-speed figure valve usually when pulsewidth modulation two and be input as zero, when the pressure of hydraulic power is zero, about two centralizing springs make the spool zero-bit that mediates.Usually drive the high-speed figure valve and be input as zero when two, when the pressure of hydraulic power is non-vanishing, the pressure P of left side control chamber
2Pressure P greater than right side control chamber
1, spool and moving right.Moving to right of spool causes R
3Increase and R
4Reduce, thereby make the pressure P of right side control chamber
1The pressure P of increase and left side control chamber
2Reduce.The pilot pressure P of two control chambers when about spool
1And P
2When equating, spool stops at the position of right side standard-sized sheet, and the P mouth communicates with the T mouth, the full overflow of proportional pressure valve.When the pressure of pressure source was non-vanishing, opening the input of high-speed figure valve usually as if two increased the pressure P of right side control chamber
1To raise, spool is to left movement.Moving to left of spool causes liquid resistance R
3Reduce and R
4Increase, thereby make the pressure P of right side control chamber
1The pressure P of reduction and left side control chamber
2Increase, stop spool to continue to left movement.The pressure P of two control chambers when about spool
1And P
2When equating, spool stops at new position, and the displacement of spool is directly proportional with input voltage (or electric current) size of proportion electro-magnet.When two drive the high-speed figure valve usually and are input as maximum, if the pressure P of spool right side control chamber
1Less than the electromagnetic force that the high-speed figure valve produces, then spool stops at zero-bit, and P mouth and T mouth are obstructed, not overflow of proportional pressure valve.If the pressure P of spool right side control chamber
1Greater than the electromagnetic force that the high-speed figure valve produces, then spool will move to right, and the P mouth communicates with the T mouth, the proportional pressure valve overflow.
Claims (1)
1. pulsewidth modulation proportional pressure valve, it is by valve body, spool is formed, it is characterized by spool (2) is set in valve body (1), the scroll linear restrictor device (11) of spool (2) one ends is communicated with (T) passage and the right control chamber (10) respectively, pulsewidth modulation two drives high-speed figure valve (8) usually and electromagnet (7) utilizes bolt nut to connect with valve body (1), the scroll linear restrictor device (12) of the other end of spool (2) is communicated with (T) passage and left side control chamber (14) respectively, spring (9) and (13) are valve core reseting spring, (P), (T) respectively be passage, in valve body (1), also be provided with scroll linear restrictor device (3) and (4), they respectively with (P) passage, left side control chamber (14), the right control chamber (10) is communicated with, (6) and (16) be ratio pressure valve core zero adjusting screw, (15) are stifled for plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95227926 CN2253780Y (en) | 1995-12-06 | 1995-12-06 | Pulse width modulation proportional pressure valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95227926 CN2253780Y (en) | 1995-12-06 | 1995-12-06 | Pulse width modulation proportional pressure valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2253780Y true CN2253780Y (en) | 1997-05-07 |
Family
ID=33873648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95227926 Expired - Fee Related CN2253780Y (en) | 1995-12-06 | 1995-12-06 | Pulse width modulation proportional pressure valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2253780Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110185664A (en) * | 2019-05-21 | 2019-08-30 | 北京理工大学 | A kind of pilot stage digital electric hydraulic servo that area gradient is variable |
-
1995
- 1995-12-06 CN CN 95227926 patent/CN2253780Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110185664A (en) * | 2019-05-21 | 2019-08-30 | 北京理工大学 | A kind of pilot stage digital electric hydraulic servo that area gradient is variable |
| CN110185664B (en) * | 2019-05-21 | 2021-02-12 | 北京理工大学 | Area gradient variable pilot-stage digital electro-hydraulic servo valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |