CN220687750U - Speed regulator hydraulic servo system adopting pilot valve position for closed-loop control - Google Patents
Speed regulator hydraulic servo system adopting pilot valve position for closed-loop control Download PDFInfo
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- CN220687750U CN220687750U CN202321259313.XU CN202321259313U CN220687750U CN 220687750 U CN220687750 U CN 220687750U CN 202321259313 U CN202321259313 U CN 202321259313U CN 220687750 U CN220687750 U CN 220687750U
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 25
- 230000003993 interaction Effects 0.000 claims abstract description 11
- 230000007935 neutral effect Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 23
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 239000010720 hydraulic oil Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
A governor hydraulic follower system for closed loop control using pilot valve position, the system comprising: the system comprises a man-machine interaction module, a controller, a stepping motor, a guide valve and a main pressure distribution valve; the controller is connected with the stepping motor, the stepping motor is connected with the guide valve, the guide valve is connected with the main pressure distribution valve, and the main pressure distribution valve is connected with the servomotor; the pilot valve is provided with a first displacement sensor for measuring the position of a valve core of the pilot valve, and the first displacement sensor is connected with the controller. And controlling the displacement of the stepping motor according to the difference value between the main pressure distribution valve position setting and the pilot valve position feedback, so as to control the pilot valve position, wherein the main pressure distribution valve position is realized together with a mechanical negative feedback closed loop of the pilot valve position. The utility model provides a speed regulator hydraulic servo system adopting a guide valve position for closed-loop control, which aims to reduce the jamming probability of an electrohydraulic conversion and execution structure, improve the working reliability of the speed regulator hydraulic servo system and reduce the failure rate.
Description
Technical Field
The utility model relates to a speed regulator hydraulic servo system, in particular to a speed regulator hydraulic servo system adopting a guide valve position for closed-loop control.
Background
The Chinese patent (patent number: ZL201910024102. X) discloses a speed regulator hydraulic servo system adopting a proportional valve and a main distribution and relay as actuating mechanisms. The proportional valve is used as a precise hydraulic element, the requirement on the oil quality of hydraulic oil of a hydraulic system is very high, and the valve body is possibly jammed due to solid particulate matters impurities contained in the hydraulic oil, so that the normal operation of a speed regulator hydraulic follow-up system adopting the proportional valve as an electrohydraulic conversion device is influenced, a new speed regulator hydraulic follow-up system which is difficult to jam is required to be researched and explored, and other electrohydraulic conversion and actuating mechanism forms are adopted.
Disclosure of Invention
In order to solve the technical problems, the utility model provides a speed regulator hydraulic servo system adopting a guide valve position to carry out closed-loop control, which is suitable for a hydroelectric generating set speed regulator to carry out opening control of a guide vane of a generating set, and aims to reduce the probability of jamming of an electrohydraulic conversion and execution structure, improve the working reliability of the speed regulator hydraulic servo system and reduce the failure rate.
The technical scheme adopted by the utility model is as follows:
a governor hydraulic follower system for closed loop control using pilot valve position, the system comprising:
the system comprises a man-machine interaction module, a controller, a stepping motor, a guide valve and a main pressure distribution valve;
the controller is connected with the stepping motor, the stepping motor is connected with the guide valve, the guide valve is connected with the main pressure distribution valve, and the main pressure distribution valve is connected with the servomotor; the pilot valve is provided with a first displacement sensor for measuring the position of a valve core of the pilot valve, and the first displacement sensor is connected with the controller. And the man-machine interaction module inputs the electric neutral position set value parameters of the pilot valve of the hydraulic servo system of the speed regulator and the control command into the controller.
The controller controls the displacement of the stepping motor according to the difference value between the main pressure distribution valve position setting and the pilot valve position feedback, so as to control the pilot valve position, and the main pressure distribution valve position is realized together with a mechanical negative feedback closed loop of the pilot valve position.
The servomotor is provided with a second displacement sensor which is connected with the controller.
The servomotor is connected with a hydroelectric generating set, and the hydroelectric generating set is provided with a rotating speed measuring device and a power transmitter.
A closed-loop control method for the position of a pilot valve,
and controlling the displacement of the stepping motor according to the difference value between the main pressure distribution valve position setting and the pilot valve position feedback, so as to control the pilot valve position, wherein the main pressure distribution valve position is realized together with a mechanical negative feedback closed loop of the pilot valve position.
When the valve core of the guide valve moves downwards, the P oil port and the A oil port of the guide valve are communicated, the Y end of the main pressure distribution valve is communicated with pressure oil, the valve core of the main pressure distribution valve moves downwards, so that the valve sleeve of the guide valve moves downwards, when the displacement of the valve core of the guide valve and the valve sleeve is the same, the P oil port and the A oil port of the guide valve are not communicated, and at the moment, the mechanical following system enters a steady state;
when the valve core of the guide valve moves upwards, the T oil port and the A oil port of the guide valve are communicated, the Y end of the main pressure distribution valve is communicated with non-pressure oil return, the valve core of the main pressure distribution valve moves upwards, the valve sleeve of the guide valve moves upwards, when the displacement of the valve core of the guide valve and the valve sleeve is the same, the T oil port and the A oil port of the guide valve are not communicated, and at the moment, the mechanical following system enters a steady state.
By the mode, the mechanical negative feedback closed loop of the main valve core position following the guide valve core position of the main valve core is realized.
The utility model relates to a speed regulator hydraulic servo system adopting a guide valve position for closed-loop control, which has the following technical effects:
1) The hydraulic servo system of the speed regulator adopts the combination of the stepping motor, the guide valve and the main pressure distribution valve as an electrohydraulic conversion and execution mechanism, reduces the jamming probability of the electrohydraulic conversion and execution structure, improves the working reliability of the hydraulic servo system of the speed regulator, and reduces the failure rate.
2) Compared with the traditional electric negative feedback closed loop, the mechanical negative feedback closed loop with the main valve core position following the valve core position of the guide valve has fewer intermediate links, no electric links, simpler and more compact structure, better quick action and higher reliability.
Drawings
The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic diagram of a hydraulic servo system of a speed governor according to the present utility model.
Fig. 2 is a schematic diagram of a closed-loop control system of the electric control system of the present utility model.
FIG. 3 is a schematic mechanical diagram of a hydraulic follower system of a governor;
fig. 4 shows various lines of the line type of fig. 3.
Detailed Description
As shown in fig. 1, a governor hydraulic follower system employing pilot valve position for closed loop control, comprising: the device comprises a man-machine interaction module 12, a controller 13, a stepping motor 3, a guide valve 2, a main distributing valve 1, a servomotor 7, a displacement sensor, a rotating speed measuring device, a power transmitter 15, a communication medium and the like.
The controller 13 is connected with the stepping motor 3, the stepping motor 3 is connected with the guide valve 2, the guide valve 2 is connected with the main pressure distribution valve 1, and the main pressure distribution valve 1 is connected with the servomotor 7. The pilot valve 2 is provided with a first displacement sensor 5 for measuring the position of the pilot valve spool, the first displacement sensor 5 being connected to a controller 13.
The servomotor 7 is provided with a second displacement sensor 4, and the second displacement sensor 4 is connected with a controller 13.
The servomotor 7 is connected with a hydroelectric generating set 11, and the hydroelectric generating set 11 is provided with a rotating speed measuring device and a power transmitter 15. The rotation speed measuring device and the power transmitter 15 comprise a power transmitter module and a rotation speed signal device; power transmitter module NSD-PTM-V1.2) measures the power signal of a single-phase or three-phase ac voltage and current signal. Through the interface selection of the upper computer, the measured power signals are converted into standard RS232 and RS485 and Ethernet TCP/IP/IP/IP communication protocols; or 4-20mA and 0-10V analog signals are output to the outside. The rotating speed signal device RES3000 adopts a high-performance industrial grade CPU as a core control unit to realize intelligent control of the rotating speed and frequency of the water turbine unit.
The hydro-generator set 11 is connected with a power grid 14, the power grid 14 is connected with a PT residual voltage frequency measuring device 16, and the PT residual voltage frequency measuring device 16 is connected with the controller 13.
Communication media include hard-wired, network-wired, and the like communication cables that function to communicate information flow between the human-machine interaction module 12, the controller 13, control objects, and sensors.
The man-machine interaction module 12 is a touch screen generally, so that a man-machine interaction function is realized, and a user can input parameters such as an electric neutral position set value of the pilot valve 2 of the hydraulic servo system of the speed regulator and a control command into the controller 13 through the man-machine interaction module 12; the controller 13 may control objects such as: status information such as positions, frequencies and the like of the pilot valve 2, the relay 7 and the hydroelectric generating set 11 are displayed in real time to inform a user.
The controller 13 collects the state signals of the control objects, such as the pilot valve 2 and the servomotor 7, through the sensors, processes various input signals in real time according to the logic of the control program according to the control parameters and commands issued by the user through the man-machine interaction module 12, and outputs the control signals to the control objects. The controller 13 may be of various brands PLC, PCC, ARM, etc. The control method adopts a classical closed-loop control theory. A schematic diagram of the closed-loop control structure of the electric control system is shown in fig. 2.
As shown in fig. 2, the control target of the guide vane opening control loop is that the guide vane opening feedback follows the guide vane opening given, which is realized through an electric negative feedback closed loop; the main-configuration control loop controls the position of the pilot valve 2 by controlling the displacement of the stepping motor 3 according to the difference between the main-configuration setting and the feedback of the position of the pilot valve, wherein the main-configuration setting is followed by the main-configuration setting, and the main-configuration setting is jointly realized by a mechanical negative feedback closed loop of the position of the pilot valve. The operation force of the stepping motor 3 is far larger than that of a proportional valve, the harsh requirements on the external environment or an intermediate medium are not required like the proportional valve, and the blocking and refusing phenomenon like the proportional valve is not generated. The mechanical negative feedback closed loop structure of the main position following the guide valve position is shown in fig. 3, and the serial numbers, names, codes and numbers of the components in fig. 3 are shown in table 1:
TABLE 1 serial number, name, code, number of parts
| Sequence number | Name of the name | (Code) | Quantity of | Remarks |
| 1 | Main distributing valve | 200DR | 1 | DN250 |
| 2 | Guide valve | 201DR | 1 | DN250 |
| 3 | Stepping motor | 102EB | 1 | |
| 5 | Pilot valve position sensor | 112MM | 1 | |
| 6 | Guide vane position sensor | 101MM | 1 | |
| 7 | Relay device | JLQ | 2 | |
| 8 | Relay ring | JLH | 1 | |
| 9 | Oil pressing tank | YYG | 1 | |
| 10 | Oil return tank | HYX | 1 |
As can be seen from fig. 3, the valve sleeve of the pilot valve 2 and the valve body of the main pressure regulator valve 1 are mechanically hard-connected. When the valve core of the guide valve 2 moves downwards, the P oil port and the A oil port of the guide valve 2 are communicated, the Y end of the main pressure distribution valve 1 is communicated with pressure oil, the valve core of the main pressure distribution valve 1 moves downwards, the valve sleeve of the guide valve 2 moves downwards, when the displacement of the valve core of the guide valve 2 and the displacement of the valve sleeve are the same, the P oil port and the A oil port of the guide valve 2 are not communicated, and at the moment, the mechanical following system enters a steady state;
when the valve core of the guide valve 2 moves upwards, the T oil port and the A oil port of the guide valve 2 are communicated, the Y end of the main pressure distribution valve 1 is communicated with pressureless oil return, the valve core of the main pressure distribution valve 1 moves upwards, the valve sleeve of the guide valve 2 is caused to move upwards, and when the displacement of the valve core of the guide valve 2 and the displacement of the valve sleeve are the same, the T oil port and the A oil port of the guide valve 2 are not communicated, and at the moment, the mechanical following system enters a steady state.
From the above process, the mechanical structure realizes a mechanical negative feedback closed loop structure that the main matching (valve core) position follows the guide valve (valve core) position.
Claims (5)
1. A governor hydraulic follower system employing pilot valve position for closed loop control, the system comprising: the device comprises a man-machine interaction module (12), a controller (13), a stepping motor (3), a guide valve (2) and a main pressure distribution valve (1);
the controller (13) is connected with the stepping motor (3), the stepping motor (3) is connected with the guide valve (2), the guide valve (2) is connected with the main pressure distribution valve (1), and the main pressure distribution valve (1) is connected with the servomotor (7);
the pilot valve (2) is provided with a first displacement sensor (5) for measuring the position of a valve core of the pilot valve, and the first displacement sensor (5) is connected with a controller (13).
2. A governor hydraulic follower system employing pilot valve position for closed-loop control according to claim 1, wherein: the man-machine interaction module (12) inputs the electric neutral position set value parameters of the pilot valve of the hydraulic servo system of the speed regulator and the control command into the controller (13).
3. A governor hydraulic follower system employing pilot valve position for closed-loop control according to claim 1, wherein: the controller (13) controls the displacement of the stepping motor (3) according to the difference value of the position feedback of the main distributing valve (1) and the position feedback of the guiding valve (2), thereby controlling the position of the guiding valve (2).
4. A governor hydraulic follower system employing pilot valve position for closed-loop control according to claim 1, wherein: the servomotor (7) is provided with a second displacement sensor (4), and the second displacement sensor (4) is connected with the controller (13).
5. A governor hydraulic follower system employing pilot valve position for closed-loop control as defined in claim 4, wherein: the servomotor (7) is connected with the hydroelectric generating set (11), and the hydroelectric generating set (11) is provided with a rotating speed measuring device and a power transmitter (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321259313.XU CN220687750U (en) | 2023-05-23 | 2023-05-23 | Speed regulator hydraulic servo system adopting pilot valve position for closed-loop control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321259313.XU CN220687750U (en) | 2023-05-23 | 2023-05-23 | Speed regulator hydraulic servo system adopting pilot valve position for closed-loop control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220687750U true CN220687750U (en) | 2024-03-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321259313.XU Active CN220687750U (en) | 2023-05-23 | 2023-05-23 | Speed regulator hydraulic servo system adopting pilot valve position for closed-loop control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220687750U (en) |
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2023
- 2023-05-23 CN CN202321259313.XU patent/CN220687750U/en active Active
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