Valve driver with valve rod position detection function

Abstract

The utility model discloses a valve driver with a valve rod position detection function, and relates to the field of valve control devices. The valve rod is movably arranged on the supporting part; the position sensor is arranged on the supporting part and used for detecting the position of the valve rod; the transmission part is arranged on the supporting part and is used for transmitting a valve rod position signal to the position sensor; and the transmission part comprises a hairspring arranged at the bottom of the position sensor. The method has the effect of improving the position detection precision of the driver.

Description

Technical Field

[0001] The present application relates to the field of valve control devices, and in particular to a valve driver with a valve stem position detection function. Background Art

[0002] A valve driver is a control device used to remotely control the movement of a valve.

[0003] The patent with publication number CN202441952U discloses an automatic valve driver, characterized in that its structure includes: a housing and a circuit control module, a drive execution module, and a status indication module arranged in the housing; wherein the housing is composed of an upper housing and a lower housing; the circuit control module is mainly a circuit board, a speed detection sensor is arranged in the circuit board, and the circuit control module is connected with the drive execution module and the status indication module; the status indication module includes an LED indicator and an LED light guide hole, the LED indicator is arranged on the circuit board, and the LED light guide hole is arranged on the housing; the drive execution module includes a micromotor, a gear set, a planetary gear set and a stainless steel shaft, the gear set and the micromotor form a mechanical connection, the gear set is arranged in the gear box, including gear one, gear two, gear three, and a magnetic ring is also arranged in the gear box; the stainless steel shaft and the outer teeth of the planetary gear form an integral body, the manual adjustment knob is sleeved on the stainless steel shaft, and a spring bracket and a spring are arranged on the stainless steel shaft; a nut fixing bracket is connected to the outside of the lower housing by screws, and a connecting nut is connected to the outside of the nut fixing bracket; the manual adjustment knob is arranged on the housing. The utility model has the advantages of precise micro-adjustment, low noise, long service life, and intuitive visualization.

[0004] In the process of implementing the above application, the inventors found that there are at least the following problems in this technology: the above device is provided with a detection sensor, and the valve stem position needs to change the speed (increase or decrease) of the gear set to reach the position sensor, and the speed change of the gear set will inevitably be affected by the side clearance of the gear meshing. When the valve driver moves back and forth, the side clearance will inevitably affect the gear transmission accuracy, thereby affecting the driver position detection accuracy. Utility Model Content

[0005] In order to improve the accuracy of driver position detection, the present application provides a valve driver with a valve stem position detection function.

[0006] The valve driver with valve stem position detection function provided in this application adopts the following technical solution:

[0007] A valve driver with a valve stem position detection function comprises a support portion; a valve stem movably arranged on the support portion; a position sensor arranged on the support portion and used to detect the valve stem position; a transmission portion arranged on the support portion and used to transmit the valve stem position signal to the position sensor; the transmission portion comprises a hairspring arranged at the bottom of the position sensor.

[0008] By adopting the above technical solution, a hairspring is arranged in the transmission part, and a unidirectional rotational force is applied to the hairspring in advance during installation, so that the gears in the transmission part can be contacted and meshed in one direction, so that the meshing side clearance of the gears will not affect the progress of the gear rotation, thereby not affecting the accuracy of the valve stem position detection.

[0009] Optionally, a large gear is rotatably connected to the support portion, a nut for passing a valve stem is fixed inside the large gear, and the valve stem passes through the nut.

[0010] By adopting the above technical solution, the large gear rotates, thereby driving the nut to rotate. Since the valve stem is inserted into the nut, the large gear and the nut rotate, which can drive the valve stem to move.

[0011] Optionally, the transmission part also includes a rack fixed to the valve stem, a first gear rotatably connected to the support part and meshing with the rack, a first bevel gear is fixed to the end of the first gear, a second bevel gear rotatably connected to the support part and meshing with the first bevel gear, and the rotating shaft of the second bevel gear corresponds to the position sensor.

[0012] By adopting the above technical solution, the movement of the valve stem drives the rack to move synchronously. Through the transmission of the first gear, the first bevel gear, and the second bevel gear, the rotating shaft of the second bevel gear rotates, and the position signal is transmitted to the position sensor.

[0013] Optionally, one end of the hairspring is fixed to the rotating shaft of the second bevel gear.

[0014] By adopting the above technical solution, the hairspring is placed at the shaft of the second bevel gear, and the shaft of the second bevel gear is the last transmission link of the transmission part. Therefore, the hairspring can act on the gears in the transmission part to make them contact and mesh in one direction.

[0015] Optionally, the position sensor is a magnetic rotary encoder, and a magnet is fixed to the end of the rotating shaft of the second bevel gear.

[0016] By adopting the above technical solution, a magnet is fixed at the end of the rotating shaft, and the rotation of the rotating shaft can drive the magnet to rotate, thereby transmitting the position information of the valve stem to the magnetic rotary encoder.

[0017] Optionally, there is a certain distance between the magnet and the position sensor.

[0018] By adopting the above technical solution, there is a certain distance between the magnet and the position sensor, so that no friction occurs between the two, further reducing the influence of friction on the transmission process.

[0019] Optionally, a support plate is fixed on the support portion, and one end of the hairspring is fixed in the support plate.

[0020] By adopting the above technical solution, a support plate is fixed on the support part, the support plate supports the hairspring, and one end of the hairspring is fixed in the support plate, which is convenient for the hairspring to store and release energy.

[0021] In summary, the present application includes at least one of the following beneficial technical effects:

[0022] 1. A hairspring is set in the transmission part. When installing, a unidirectional rotation force is applied to the hairspring in advance, so that the gears in the transmission part can be contacted and meshed in one direction, so that the meshing side clearance of the gears will not affect the progress of the gear rotation, thereby not affecting the accuracy of the valve stem position detection;

[0023] 2. The hairspring is placed at the rotating shaft of the second bevel gear, which is the last transmission link of the transmission part. Therefore, the hairspring can act on the gears in the transmission part to make them contact and mesh in one direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the main structure of an embodiment of the present application.

[0025] Figure 2 yes Figure 1 Enlarged view of part A.

[0026] Figure 3 This is a top view of the main structure of the embodiment of the present application

[0027] Description of reference numerals:

[0028] 1. Support part; 2. Valve stem; 3. Position sensor; 4. Transmission part; 5. Large gear; 6. Rack; 7. First gear; 8. First bevel gear; 9. Second bevel gear; 11. Magnet; 12. Support plate; 13. Hairspring; 14. Motor. Implementation

[0029] The following is combined with Figure 1-3 This application is described in further detail.

[0030] The embodiment of the present application discloses a valve driver with a valve stem position detection function. Figure 1 , Figure 2 and Figure 3The valve driver with the function of detecting the position of the valve stem 2 comprises a support part 1, on which a device for driving the movement of the valve is installed; a valve stem 2 is movably arranged on the support part 1, and the valve stem 2 can slide on the support part 1 in a vertical direction, and a large gear 5 is rotatably connected to the support part 1 through a rotating shaft, a nut is fixed inside the large gear 5, the nut and the large gear 5 are coaxially arranged, the valve stem 2 is penetrated by the nut and is threadedly connected with the inner wall of the nut, and the valve stem 2 and the large gear 5 are coaxially arranged, and the nut can be driven to rotate by rotating the large gear 5, thereby driving the movement of the valve stem 2, a motor 14 is fixed on the support part 1 by bolts, a driving gear is fixed at the rotating shaft of the motor 14, and the driving gear is meshed with the large gear 5, and the rotation of the motor 14 can drive the large gear 5 to rotate, thereby driving the rotation of the valve stem 2, and a limited position block is arranged on the valve stem 2, so that the valve stem 2 can only move along the axis direction of the large gear 5 under the drive of the nut and the large gear 5, that is, a linear motion.

[0031] Reference Figure 1 , Figure 2 and Figure 3 A position sensor 3 is fixed on the support part 1 by bolts. The position sensor 3 is used to detect the position signal of the valve stem 2. A transmission part 4 is also provided on the support part 1. The transmission part 4 is used to transmit the position signal of the valve stem 2 to the position sensor 3; the transmission part 4 includes a rack 6, a first gear 7, a first bevel gear 8, a second bevel gear 9, etc.; the rack 6 is vertically arranged and fixed to the valve stem 2. The fixing method here can be bonding, welding, threaded connection, etc. In this embodiment, the threaded connection fixing method is preferably used. The movement of the valve stem 2 can drive the rack 6 to move synchronously. The support part 1 is connected to the first gear 7 by rotating the shaft. Gear 7, the first gear 7 is a spur gear, and the first gear 7 is meshed with the rack 6, the movement of the rack 6 can drive the first gear 7 to rotate, and a first bevel gear 8 is fixed to the end of the first gear 7, and the fixing method here can be bonding, welding, one-piece molding, etc. In this embodiment, the one-piece molding fixing method is preferably adopted, the first bevel gear 8 is a bevel gear, and the rotation of the first gear 7 can drive the first bevel gear 8 to rotate synchronously; the support part 1 is rotatably connected with a second bevel gear 9 through a rotating shaft, the second bevel gear 9 is a bevel gear and the second bevel gear 9 is meshed with the first bevel gear 8, and the rotating shaft of the second bevel gear 9 corresponds to the position of the position sensor 3.

[0032] Reference Figure 1 , Figure 2 and Figure 3 The position sensor 3 can be a potentiometer or a magnetic rotary encoder. In this embodiment, the position sensor 3 is a magnetic rotary encoder. A magnet 11 is fixed to the end of the rotating shaft of the second bevel gear 9. The magnet 11 is cylindrical and is fixed to the end of the rotating shaft by embedding. There is a certain interval between the magnet 11 and the position sensor 3. The rotation of the rotating shaft drives the magnet 11 to rotate, thereby transmitting the position signal of the valve stem 2 to the position sensor 3.

[0033] Reference Figure 1 , Figure 2 and Figure 3 The transmission part 4 also includes a hairspring 13, which is arranged at the bottom of the position sensor 3. A support plate 12 is fixed to the support part 1 by bolts. A hole is opened on the support plate 12 and the rotating shaft is passed through the hole. The hairspring 13 is placed on the support plate 12, and the support plate 12 supports the hairspring 13. At the same time, one end of the hairspring 13 is fixed to the side wall of the rotating shaft, and the other end is fixed to the side wall of the support plate 12. During installation, a unidirectional rotational force is applied to the hairspring 13 in advance. During the rotation angle of the magnet 11 less than 360°, this rotational force is always greater than the rotational resistance of the transmission part, so that the gears are in unidirectional contact and meshing. When the valve stem 2 runs back and forth up and down, the meshing side clearance of the gears will not affect the gear transmission accuracy, thereby not affecting the position detection accuracy of the driver.

[0034] The implementation principle of a valve driver with a valve stem position detection function in an embodiment of the present application is as follows: the starting motor 14 drives the large gear 5 to rotate, and the rotation of the large gear 5 drives the valve stem 2 to move along the axial direction of the large gear 5, thereby driving the rack 6 to move, the rack 6 drives the first gear 7 to move, the first gear 7 drives the first bevel gear 8 and the second bevel gear 9 to move, thereby driving the magnet 11 on the rotating shaft to move, and transmitting the position signal of the valve stem 2 to the position sensor 3. At the same time, since a hairspring 13 is fixed on the rotating shaft, the hairspring 13 will pre-apply a unidirectional rotational force before installation, thereby reducing the influence of the meshing side clearance of the gears on the gear transmission accuracy.

[0035] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A valve driver with a valve stem position detection function, characterized in that: It comprises a supporting part (1); A valve stem (2) movably disposed on the support portion (1); A position sensor (3) is arranged on the support portion (1) and is used to detect the position of the valve stem (2); A transmission part (4) is arranged on the support part (1) and is used to transmit the position signal of the valve stem (2) to the position sensor (3); The transmission part (4) comprises a hairspring (13) arranged at the bottom of the position sensor (3).

2. The valve driver with valve stem position detection function according to claim 1, characterized in that: A large gear (5) is rotatably connected to the support portion (1), a nut for passing the valve stem (2) is fixed inside the large gear (5), and the valve stem (2) passes through the nut.

3. The valve driver with valve stem position detection function according to claim 1, characterized in that: The transmission part (4) also includes a rack (6) fixed to the valve stem (2); a first gear (7) rotatably connected to the support part (1) and meshing with the rack (6); a first bevel gear (8) is fixed to the end of the first gear (7); a second bevel gear (9) rotatably connected to the support part (1) and meshing with the first bevel gear (8); and a rotating shaft (10) of the second bevel gear (9) corresponds to the position sensor (3).

4. The valve driver with valve stem position detection function according to claim 3, characterized in that: One end of the hairspring (13) is fixed to the rotating shaft of the second bevel gear (9).

5. The valve driver with valve stem position detection function according to claim 3, characterized in that: The position sensor (3) is a magnetic rotary encoder, and a magnet (11) is fixed to the end of the rotating shaft of the second bevel gear (9).

6. The valve driver with valve stem position detection function according to claim 5, characterized in that: There is a certain distance between the magnet (11) and the position sensor (3).

7. The valve driver with valve stem position detection function according to claim 1, characterized in that: A support disk (12) is fixed on the support portion (1), and one end of the hairspring (13) is fixed inside the support disk (12).

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