CN210290310U - Rotary pressure servo valve - Google Patents
Rotary pressure servo valve Download PDFInfo
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- CN210290310U CN210290310U CN201920958301.3U CN201920958301U CN210290310U CN 210290310 U CN210290310 U CN 210290310U CN 201920958301 U CN201920958301 U CN 201920958301U CN 210290310 U CN210290310 U CN 210290310U
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Abstract
The utility model relates to a rotary pressure servo valve, a torque motor is arranged on the upper part of a valve body, a receiver is arranged below a nozzle in the torque motor to form a jet amplifier, three feedback pistons are arranged in the upper part of the valve body, two pressure recovery feedback pistons are respectively communicated with pressure output oil circuits on two sides of the jet amplifier, one output pressure feedback piston is arranged below the pressure recovery feedback piston on the right side and is communicated with an output port, a rotary valve core is arranged in the lower part of the valve body, a balance rod is fixedly connected on the rotary valve core, a window corresponding to oil inlet and oil return on the rotary valve core is of a circumference closed structure and respectively forms a cylindrical surface seal for the window of the oil inlet and the oil return, the balance rod is in contact connection with the three feedback pistons, the feedback pistons push the rotary valve core to rotate through the balance rods to form torque, the output pressure feedback piston forms resistance torque to the rotary valve core to form torque feedback, so that stable control is formed on the output pressure.
Description
Technical Field
The utility model relates to an electro-hydraulic servo valve, especially a rotation type pressure servo valve.
Background
At present, the electro-hydraulic pressure servo valve principle, as shown in fig. 1, has four oil ports on the bottom surface: motor oil feed port J1, spool oil feed port J2, oil return port H, load port S. The torque motor 21 has a jet pipe 22 therein, and the jet pipe 22 has a nozzle 23 at a lower end thereof. When no current is input into the torque motor 21, the load port S is communicated with the oil return port H, the oil inlet J2 is closed, and the pressure of the load cavity is equal to the oil return pressure. When a positive control current is passed through the torque motor 21, a differential pressure is created in the control chambers of the receiver 24, which differential pressure acts on the annular area of the spool 25, the spool 25 moves to the right, and pressurized oil enters the load chamber from the supply port J2 to output load pressure S, which in turn acts on the feedback end face of the spool 25 until the feedback force is balanced with the control force. The hydraulic servo valve outputs a load pressure proportional to the input signal.
Several current mainstream pilot amplification stages comprise a spray baffle, a jet pipe valve (comprising a single-hole receptor and a double-hole receptor) and a deflection plate valve, the functions of which are respectively to generate a differential pressure proportional to current, and the control of the pressure of a load cavity is completed by utilizing a valve core with a pressure balancing function.
The power stage of a conventional pressure servo valve is shown in fig. 1, and has two bushings, a spool, and a return spring. In order to form a feedback ratio, the inner circle and the outer circle of the bushing and two ends of the valve core must be coaxial in two stages, the processing difficulty is high, the clearance between the valve core and the bushing and the clearance between the valve core and the valve body are overlarge to compensate the coaxiality, and the reliability of the pressure servo valve is reduced.
Disclosure of Invention
The utility model aims to provide a rotation type pressure servovalve for reduce the processing degree of difficulty of pressure servovalve power level, promote whole valve reliability, and can avoid the air pocket type noise that conventional pressure servovalve caused by the rotation of power level case work limit.
The technical scheme of the utility model is that: a rotary pressure servo valve comprises a torque motor, a jet amplifier and a valve body, wherein the torque motor is arranged at the upper part of the valve body, a receiver is arranged below a nozzle in the torque motor to form the jet amplifier, three feedback pistons are arranged in the upper part of the valve body, two pressure recovery feedback pistons are respectively and symmetrically arranged and are respectively communicated with pressure output oil paths at two sides of the jet amplifier and are used for respectively receiving feedback pressure from the nozzle of the receiver, and one output pressure feedback piston is arranged below the pressure recovery feedback piston at the right side and is communicated with an output port S and is used for receiving feedback pressure from an output pressure cavity; a rotary valve core is arranged in the lower part of the valve body, a balance rod is fixedly connected to the rotary valve core, windows corresponding to the oil inlet and the oil return on the rotary valve core are of a circumferential closed structure, and cylindrical surface sealing of the windows corresponding to the oil inlet and the oil return is respectively formed, wherein umbrella-shaped grooves are respectively arranged on the left cylindrical surface and the right cylindrical surface of the rotary valve core, the left umbrella-shaped groove corresponds to the oil return opening H, and the right umbrella-shaped groove corresponds to the oil supply opening J2; the balance rod is in contact connection with the three feedback pistons, the feedback pistons push the rotary valve core to rotate left and right through the balance rod to form torque, the pressure recovery feedback pistons form driving torque on the rotary valve core, the output pressure feedback pistons form resistance torque on the rotary valve core, torque feedback is formed, and therefore stable control is formed on output pressure.
Furthermore, the balance rod is fixedly connected with the rotary valve core through a screw, a sealing ring is arranged inside the rotary valve core and is connected with the screw in a sealing mode through the sealing ring, and the tightness of an output port is guaranteed.
Furthermore, the contact surfaces of the three feedback pistons and the balance rod are saddle surfaces or V-shaped surfaces, so that the stability of the force arm of the balance rod and the axial positioning of the rotary valve core can be ensured.
Furthermore, tips are arranged at two ends of the rotary valve core and connected with the valve body through the tips, and a gap is reserved between the tips and the valve body or an elastic support is adopted for reducing friction force or conveying vibration.
Furthermore, two ends of the rotary valve core and a cavity where the balance rod is located are communicated with the oil return cavity for discharging internal oil drainage.
Further, when no current is input into the torque motor, the nozzle is positioned on the right receiver hole side, so that the pressure of the right pressure recovery feedback piston is higher than that of the left pressure recovery feedback piston, a return spring is arranged at the right pressure recovery feedback piston, and the right pressure recovery feedback piston enables the rotary valve core to rotate anticlockwise under the action of the feedback pressure and the return spring, so that the output port S is communicated with the oil return port H, and a non-control area is formed.
Further, when current is input into the torque motor, the nozzle moves leftwards, the pressure of the left pressure recovery feedback piston is higher than that of the right pressure recovery feedback piston to form a control torque, the rotary valve core is pushed to rotate clockwise, the output port S is communicated with the oil supply port J2, the pressure of the output port S is increased, meanwhile, the pressure of the output port S acts on the corresponding output pressure feedback piston to form torque feedback, the rotary valve core is pushed to rotate anticlockwise, and when the control torque and the feedback torque are balanced through the balance rod, stable control over the output pressure is formed.
The utility model has the advantages that:
1) a rotary power stage is added on the basis of the pilot stage structure of the existing pressure servo valve, and the main structure of the rotary power stage comprises a rotary valve core, a feedback piston, a balance rod, a reset spring, a sealing ring and a screw. The rotary valve core achieves torque balance through the feedback piston and the balance rod, and then output pressure is controlled. Can fill the blank of the domestic rotary pressure servo valve.
2) The utility model discloses greatly reduced the processing degree of difficulty of pressure servo valve power level, promoted whole valve reliability.
3) The utility model discloses can avoid the air pocket formula noise that conventional pressure servo valve caused by the rotation of power level case work limit.
Drawings
FIG. 1 is a schematic diagram of a conventional fluidic tube pressure servo valve;
FIG. 2 is a schematic diagram of a rotary pressure servo valve;
fig. 3 is a left side view of fig. 2.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings and examples.
The utility model discloses a novel rotation type power level has been proposed to rotation type pressure servo valve on the basis of current pressure servo valve guide level structure, as shown in figure 2, 3, mainly include: the device comprises a torque motor 1, a jet amplifier 2, a feedback piston 3, a return spring 4, an output pressure feedback piston 5, a balance rod 6, a filter 7, a sealing ring 8, a rotary valve core 9, a screw 10, a valve body 11, oil supply ports J1 and J2, an oil return port H and an output port S. The upper part of the valve body 11 is provided with a torque motor 1, a receiver forming a jet amplifier 2 is arranged below a nozzle in the torque motor 1, three feedback pistons are arranged in the valve body, two of the feedback pistons recover pressure 3, and the received feedback pressure comes from the receiver to receive the pressure of the nozzle; an output pressure feedback piston 5 receives feedback pressure from the output pressure chamber. A balance rod 6, a sealing ring 8 and a screw 9 are arranged on the rotary valve core 9, the balance rod 6 is in contact with three feedback pistons, and the contact surfaces of the three feedback pistons and the balance rod 6 are saddle surfaces or other types of double V-shaped surfaces, so that the stability of a force arm can be ensured, and the rotary valve core 9 can be axially positioned. The balance rod 6 is fixed with the rotary valve core 9 through a screw 10, and a sealing ring 8 is arranged inside the rotary valve core 9 to ensure the tightness of the output port S. Two sides of the rotary valve core 9 and the cavity of the balance rod 6 need to be led to an oil return cavity H to discharge internal drainage oil. The window corresponding to the oil inlet and oil return on the rotary valve core 9 is circumferentially closed, that is, the rotary valve core 9 is axially non-penetrated, and cylindrical surface sealing of the oil inlet and oil return oil distribution window is respectively formed. The centers are arranged on two sides of the rotary valve core 9, a gap is reserved between the centers and the installation surface, or elastic support is adopted, so that friction force or transportation vibration is reduced.
When no current is input into the torque motor 1, the nozzle is positioned on the right receiver hole side, the pressure of the right pressure recovery feedback piston 3 is higher than that of the left pressure recovery feedback piston 3, meanwhile, a return spring is arranged at the right pressure recovery feedback piston 3, the rotary valve core 9 is rotated anticlockwise by the return spring, the output port S is communicated with the oil return port H, and a control dead zone is formed.
When current is input into the torque motor 1, the nozzle moves leftwards, after the current passes through the dead zone, the pressure of the left side pressure recovery feedback piston 3 is higher than that of the right side pressure recovery feedback piston 3, a control torque is formed, the rotary valve core 9 is pushed to rotate clockwise, the output port S is communicated with the oil supply port J2, the pressure of the output port S is increased, meanwhile, the pressure of the output port acts on the corresponding output pressure feedback piston 5, torque feedback is formed, the rotary valve core 9 is pushed to rotate anticlockwise, and when the control torque and the feedback torque are balanced through the balance rod 6, stable control over the output pressure is formed. The rotary pressure servo valve outputs a load pressure proportional to the input signal.
Claims (7)
1. The utility model provides a rotation type pressure servo valve, includes torque motor, efflux amplifier, valve body, its characterized in that: the upper part of the valve body is provided with a torque motor, a receiver is arranged below a nozzle in the torque motor to form a jet amplifier, the upper part of the valve body is internally provided with three feedback pistons, two pressure recovery feedback pistons are respectively and symmetrically arranged and are respectively communicated with pressure output oil paths on two sides of the jet amplifier and used for receiving feedback pressure from the receiver, and one output pressure feedback piston is arranged below the pressure recovery feedback piston on the right side and is communicated with an output port S and used for receiving feedback pressure from an output pressure cavity; a rotary valve core is arranged in the lower part of the valve body, a balance rod is fixedly connected to the rotary valve core, windows corresponding to the oil inlet and the oil return on the rotary valve core are of a circumferential closed structure, and cylindrical surface sealing of the windows corresponding to the oil inlet and the oil return is respectively formed, wherein umbrella-shaped grooves are respectively arranged on the left cylindrical surface and the right cylindrical surface of the rotary valve core, the left umbrella-shaped groove corresponds to the oil return opening H, and the right umbrella-shaped groove corresponds to the oil supply opening J2; the balance rod is in contact connection with the three feedback pistons, the feedback pistons push the rotary valve core to rotate left and right through the balance rod to form torque, the pressure recovery feedback pistons form driving torque on the rotary valve core, the output pressure feedback pistons form resistance torque on the rotary valve core, torque feedback is formed, and therefore stable control is formed on output pressure.
2. The rotary pressure servo valve of claim 1, wherein: the balance rod is fixedly connected with the rotary valve core through a screw, a sealing ring is arranged in the rotary valve core and is connected with the screw in a sealing mode through the sealing ring, and the tightness of an output port is guaranteed.
3. The rotary pressure servo valve of claim 1, wherein: the contact surfaces of the three feedback pistons and the balance rod are saddle surfaces or V-shaped surfaces, so that the stability of the force arm of the balance rod and the axial positioning of the rotary valve core can be ensured.
4. The rotary pressure servo valve of claim 1, wherein: the two ends of the rotary valve core are provided with centers and connected with the valve body through the centers, and a gap is reserved between the centers and the valve body or an elastic support is adopted for reducing friction force or conveying vibration.
5. The rotary pressure servo valve of claim 1, wherein: and two ends of the rotary valve core and a cavity where the balance rod is positioned are communicated with the oil return cavity for discharging internal oil drainage.
6. The rotary pressure servo valve of claim 1, wherein: when no current is input into the torque motor, the nozzle is positioned on the right receiver hole side, so that the pressure of the right pressure recovery feedback piston is higher than that of the left pressure recovery feedback piston, a return spring is arranged at the right pressure recovery feedback piston, the right pressure recovery feedback piston enables the rotary valve core to rotate anticlockwise under the action of the feedback pressure and the return spring, and the output port S is communicated with the oil return port H to form a non-control area.
7. The rotary pressure servo valve of claim 1, wherein: when current is input into the torque motor, the nozzle moves leftwards, the pressure of the left pressure recovery feedback piston is higher than that of the right pressure recovery feedback piston to form control torque, the rotary valve core is pushed to rotate clockwise, the output port S is communicated with the oil supply port J2, the pressure of the output port S is increased, meanwhile, the pressure of the output port S acts on the corresponding output pressure feedback piston to form torque feedback, the rotary valve core is pushed to rotate anticlockwise, and when the control torque and the feedback torque are balanced through the balance rod, stable control on the output pressure is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920958301.3U CN210290310U (en) | 2019-06-24 | 2019-06-24 | Rotary pressure servo valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920958301.3U CN210290310U (en) | 2019-06-24 | 2019-06-24 | Rotary pressure servo valve |
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| Publication Number | Publication Date |
|---|---|
| CN210290310U true CN210290310U (en) | 2020-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920958301.3U Active CN210290310U (en) | 2019-06-24 | 2019-06-24 | Rotary pressure servo valve |
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| CN (1) | CN210290310U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110230616A (en) * | 2019-06-24 | 2019-09-13 | 上海衡拓液压控制技术有限公司 | Rotary pressure servo valve |
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2019
- 2019-06-24 CN CN201920958301.3U patent/CN210290310U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110230616A (en) * | 2019-06-24 | 2019-09-13 | 上海衡拓液压控制技术有限公司 | Rotary pressure servo valve |
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