Anti-seismic regulating valve position feedback device

Abstract

The utility model provides an anti-vibration adjusting valve position feedback device. The anti-vibration adjusting valve position feedback device comprises an angular displacement input shaft, a transmission shaft, a cam set, a microswitch set, a rotary angular displacement sensor and an electric control unit. One end of the angular displacement input shaft is linked with a valve rod of the adjusting valve through a connecting rod, the other end of the angular displacement input shaft is connected with the transmission shaft in an embedded mode, the cam set is arranged on the transmission shaft and can rotate along with the transmission shaft, and the microswitch set is arranged on the circumferential face of the cam set. A measuring rotating shaft of the rotary angular displacement sensor is in embedded connection with the other end of the transmission shaft; the microswitch group is electrically connected with the electric control unit; and the rotary angular displacement sensor is electrically connected with the electric control unit. According to the utility model, the cam group and the microswitch group are added to form a mechanical limiting structure, and the mechanical limiting structure is connected with the angular displacement input shaft and the measurement rotating shaft in an embedded manner to form a linkage relationship, so that the axial connection is more stable, the condition of transmission failure cannot occur under the working condition of higher vibration, and meanwhile, the installation and the debugging are also convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of position feedback devices, in particular to a shock-resistant regulating valve position feedback device. Background Art

[0002] In the field of valve control technology, electric control valve is a common flow control device, which mainly drives the valve to open and close through electric actuator to achieve precise control of fluid. The position feedback device is an important part of the electric control valve. It can monitor the valve opening in real time and convert it into an electrical signal to feed back to the control system to achieve precise closed-loop control. However, in some working conditions with high vibration, such as in the field of earthquake engineering, the position feedback device may experience transmission failure and poor output linearity due to vibration.

[0003] The existing technology reduces the transmission of vibration between structures by installing buffer elements such as shock pads or springs. However, the disadvantage is that it increases the complexity and cost of the device, and the installation and debugging of the device are more time-consuming.

[0004] Therefore, it is necessary to improve the existing technology. Utility Model Content

[0005] The utility model provides a shock-resistant regulating valve position feedback device to solve the above problem.

[0006] A technical solution adopted by the utility model is: to provide a seismic-resistant regulating valve position feedback device, including: an angular displacement input shaft, a transmission shaft, a cam group, a micro switch group, a rotary angular displacement sensor and an electronic control unit;

[0007] One end of the angular displacement input shaft is linked to the valve stem of the regulating valve through a connecting rod, and the other end is embedded and connected with the transmission shaft. The cam group is arranged on the transmission shaft and can rotate with the transmission shaft. The micro switch group is arranged on the circumferential surface of the cam group. When the cam group rotates with the transmission shaft, the cam therein will rotate to a predetermined position and touch the contact of the corresponding micro switch. The measuring rotating shaft of the rotary angular displacement sensor is embedded and connected with the other end of the transmission shaft.

[0008] The micro switch group is electrically connected to the electric control unit, and transmits the electrical signal when the micro switch contacts are triggered to the electric control unit;

[0009] The rotary angular displacement sensor is electrically connected to the electronic control unit to convert the mechanical rotation angle signal of the transmission shaft into a corresponding electrical signal and transmit it to the electronic control unit.

[0010] Furthermore, the micro switch group has four micro switches, and correspondingly, the cam group has four cams, each of which has an edge that can contact the contact of the corresponding micro switch. When the edge of the cam rotates to a predetermined position, it will touch the contact of the corresponding micro switch.

[0011] Furthermore, each of the micro-control switches is distributed in an orderly manner on the circumferential surface of the cam group, corresponding to the fully closed state, one-third open state, two-thirds open state and fully open state of the regulating valve respectively. The cam position and the corresponding current signal 4~20mA must be calibrated before the position feedback device is used.

[0012] Furthermore, the contacts of the micro switch are made of a copper alloy material with high conductivity and wear resistance, and the contact spacing is 1.5 mm to improve stability.

[0013] Furthermore, the edge of the cam is made of hard alloy to improve wear resistance, and the edge is designed with a lubrication groove to reduce edge wear by coating a lubricating oil film.

[0014] Furthermore, a damper is provided at the connection between the angular displacement input shaft, the transmission shaft and the measuring rotating shaft, and the damping coefficient is 0.5 to absorb vibration.

[0015] The beneficial effects of the anti-vibration type regulating valve position feedback device of the utility model are:

[0016] 1. Add a mechanical limit structure consisting of a cam group and a micro switch group. This structure is embedded and connected with the angular displacement input shaft and the measuring rotation shaft to form a linkage relationship, so that the connection of the overall structure in the axial direction is more stable, and there will be no transmission failure under high vibration conditions. It is also convenient for installation and debugging. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of a seismic-resistant regulating valve position feedback device according to the first embodiment of the utility model;

[0018] The components in the accompanying drawings are marked as follows: 1. angular displacement input shaft, 2. transmission shaft, 3. cam group, 4. micro switch group, 5. rotary angular displacement sensor, 6. electronic control unit, 7. auxiliary connecting frame. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0020] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", "front", "back", "horizontal", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention. They cannot indicate or imply that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0021] See also Figure 1 The first embodiment of the utility model provides a seismic-resistant regulating valve position feedback device, comprising: an angular displacement input shaft 1, a transmission shaft 2, a cam group 3, a micro switch group 4, a rotary angular displacement sensor 5 and an electronic control unit 6;

[0022] One end of the angular displacement input shaft 1 is linked to the valve stem of the regulating valve through a connecting rod, and the other end is embedded and connected with the transmission shaft 2, so that the linear motion of the valve stem is converted into the rotational motion of the angular displacement input shaft 1;

[0023] The cam group 3 is arranged on the transmission shaft 2 and can rotate with the transmission shaft 2. The micro switch group 4 is arranged on the circumferential surface of the cam group 3. When the cam group 3 rotates with the transmission shaft 2, the cam therein will rotate to a predetermined position and touch the contact of the corresponding micro switch. The measuring rotating shaft of the rotary angular displacement sensor 5 is embedded and connected with the other end of the transmission shaft 2. The rotary angular displacement sensor 5 can obtain angular displacement information through the angle change of the transmission shaft 2.

[0024] The micro switch group 4 is electrically connected to the electric control unit 6, and transmits the electric signal when the micro switch contact is triggered to the electric control unit 6. By setting a certain number and position of micro switches, in cooperation with the corresponding cam, the position detection of the position feedback device can be assisted, and the accuracy of the position detection can be enhanced;

[0025] The rotary angular displacement sensor 5 is electrically connected to the electronic control unit 6 to convert the mechanical rotation angle signal of the transmission shaft 2 into a corresponding electrical signal and transmit it to the electronic control unit 6;

[0026] The electric control unit 6 collects, processes and converts the angle signal from the micro switch group 4 and the rotary angle displacement sensor, and finally outputs a current signal of 4-20 mA.

[0027] The position feedback device uses high-strength alloy steel to make the installation frame to protect the internal structure. The frame thickness is 5mm to ensure the stability of the device:

[0028] The micro switch group 4 is arranged on the annular wall inside the mounting frame, and each micro switch can adjust the position along the circumferential direction on the annular inner wall;

[0029] An auxiliary connecting frame 7 is also provided in the installation frame, which is used to set the angular displacement input shaft 1, the transmission shaft 2, and the measuring rotation shaft, and provides a guiding and limiting function. The thickness of the auxiliary connecting frame 7 is 2 mm, and each shaft is connected to the auxiliary connecting frame 7 in a rotating manner, so that the axial connection of the transmission part is more stable and accurate;

[0030] A damper is also provided at the connection between the angular displacement input shaft 1, the transmission shaft 2 and the measuring rotating shaft, and the damping coefficient is 0.5 to absorb vibration.

[0031] The micro switch group 4 is provided with four micro switches, and correspondingly, the cam group 3 is provided with four cams, each of which has an edge that can contact with the contact of the corresponding micro switch. When the edge of the cam rotates to a predetermined position, it will touch the contact of the corresponding micro switch:

[0032] Each micro switch is distributed in order on the circumferential surface of the cam group 3, corresponding to the fully closed state, one-third open state, two-thirds open state and fully open state of the regulating valve respectively. The specific position of the micro switch should be set according to the maximum stroke of the valve stem adjustment converted into angular displacement. Before using the position feedback device, the micro switch position, cam position and corresponding current signal 4-20mA should be calibrated;

[0033] The contacts of the micro switch are made of copper alloy with high conductivity and wear resistance. The contact spacing is 1.5mm to improve stability. The edge of the cam is made of hard alloy to improve wear resistance. The edge is also designed with lubrication grooves to reduce edge wear by applying a lubricating oil film.

[0034] Calibration of the position feedback device before use:

[0035] After installing the position feedback device on the electric regulating valve, adjust the valve to the fully open state, set the first micro switch (the micro switch of the open limit) just above the cam, and then rotate the cam corresponding to the open limit to the position that just triggers the micro switch of the open limit. The rotary angular displacement sensor 5 outputs a position signal, and the electronic control unit 6 adjusts the current output to 20mA.

[0036] An adjustment indicator rod is set next to the fourth micro switch (the micro switch of the closing limit) to point upward, and the valve is adjusted to the fully closed state. The micro switch of the closing limit is set in the direction pointed by the adjustment indicator rod, and then the cam corresponding to the closing limit is rotated to the position that just triggers the micro switch of the closing limit. The rotary angular displacement sensor 5 outputs a position signal, and the electronic control unit 6 adjusts the current output to 4mA;

[0037] Adjust the second and third micro switches so that the four micro switches are evenly distributed in the circumferential direction. The second and third micro switches correspond to the two-thirds open state and one-third open state of the regulating valve, and then turn the corresponding cam to the position that is just triggered.

[0038] The position feedback device was installed and tested in a power plant environment with high vibration levels, and complies with the GB / T 2423.10-2008 anti-vibration test standard. After a test over an overhaul cycle, the device had no transmission failure, a low number of failures, good output linearity, and stable and reliable operation.

[0039] The beneficial effects of the anti-vibration type regulating valve position feedback device of the utility model are:

[0040] 1. Add a mechanical limit structure consisting of a cam group and a micro switch group. This structure is embedded and connected with the angular displacement input shaft and the measuring rotation shaft to form a linkage relationship, so that the connection of the overall structure in the axial direction is more stable, and there will be no transmission failure under high vibration conditions. It is also convenient for installation and debugging;

[0041] 2. Use high-strength alloy steel to make the installation frame, and use the auxiliary connecting frame to provide guidance and limit for the connection of the shaft, so that the axial connection of the structure is stable and the angular position is collected accurately;

[0042] 3. Design four micro switches to calibrate the limit points of the valve switch, more accurately define and judge the valve opening, and improve the accuracy and reliability of the valve switch.

[0043] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A seismic-resistant regulating valve position feedback device, characterized in that: include: Angular displacement input shaft, transmission shaft, cam group, micro switch group, rotary angular displacement sensor and electronic control unit; One end of the angular displacement input shaft is linked to the valve stem of the regulating valve through a connecting rod, and the other end is embedded and connected with the transmission shaft. The cam group is arranged on the transmission shaft and can rotate with the transmission shaft. The micro switch group is arranged on the circumferential surface of the cam group. When the cam group rotates with the transmission shaft, the cam therein will rotate to a predetermined position and touch the contact of the corresponding micro switch. The measuring rotating shaft of the rotary angular displacement sensor is embedded and connected with the other end of the transmission shaft. The micro switch group is electrically connected to the electric control unit, and transmits the electrical signal when the micro switch contacts are triggered to the electric control unit; The rotary angular displacement sensor is electrically connected to the electronic control unit to convert the mechanical rotation angle signal of the transmission shaft into a corresponding electrical signal and transmit it to the electronic control unit.

2. The anti-vibration control valve position feedback device according to claim 1, characterized in that: The micro switch group has four micro switches, and correspondingly, the cam group has four cams, each of which has an edge that can contact the contact of the corresponding micro switch. When the edge of the cam rotates to a predetermined position, it will touch the contact of the corresponding micro switch.

3. The anti-vibration control valve position feedback device according to claim 2, characterized in that: The micro-control switches are distributed in order on the circumferential surface of the cam group, corresponding to the fully closed state, one-third open state, two-thirds open state and fully open state of the regulating valve respectively.

4. A seismic-resistant regulating valve position feedback device according to any one of claims 1 to 3, characterized in that: The contacts of the micro switch are made of copper alloy material with high conductivity and wear resistance, and the contact spacing is 1.5 mm.

5. The anti-vibration control valve position feedback device according to claim 4, characterized in that: The edge of the cam is made of hard alloy and is designed with a lubrication groove.

6. A seismic-resistant regulating valve position feedback device according to any one of claims 1 to 3, characterized in that: A damper is provided at the connection between the angular displacement input shaft, the transmission shaft and the measuring rotation shaft, and the damping coefficient is 0.

5.

7. The anti-vibration control valve position feedback device according to claim 6, characterized in that: The contacts of the micro switch are made of copper alloy material with high conductivity and wear resistance, and the contact spacing is 1.5 mm.

8. The anti-vibration control valve position feedback device according to claim 7, characterized in that: The edge of the cam is made of hard alloy and is designed with a lubrication groove.

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