Valve actuating mechanism

Abstract

The utility model provides a valve actuating mechanism which comprises a shell, a connecting shaft, a transmission mechanism, a driving device, a photoelectric switch and a handle. The connecting shaft is rotationally installed on the shell and provided with an induction rod in the radial direction, one end of the connecting shaft is connected with the handle, and the other end of the connecting shaft is used for being connected with an external valve element. The transmission mechanism is respectively connected with the connecting shaft and the driving device; the driving device is mounted on the shell; the photoelectric switch is installed on the shell, matched with the induction rod and used for inducting the position of the induction rod. The position of the sensing rod is sensed through the photoelectric switch, the specific rotating position of the connecting shaft can be accurately sensed, and the control precision is improved; one end of the connecting shaft is connected with the handle, the transmission mechanism is connected with the connecting shaft and the driving device, the connecting shaft can be driven to rotate automatically through the driving device and the transmission mechanism, the connecting shaft can be controlled to rotate through manual operation of the handle, automatic and manual operation of the valve is achieved, and the reliability of the device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a valve actuator. Background Art

[0002] Valves are commonly used products in people's daily lives. They are connected to water or gas supply pipelines to control the switch of the pipeline or adjust the flow in the pipeline. Currently, the more commonly used valves are often to manually turn the handle to rotate the valve core inside the valve, thereby changing the valve opening. As people's requirements for intelligence and automation become higher and higher, electric valves have appeared in the valve field and gradually become popular. They use controllers, operation panels or sensors to cooperate with motors to automatically drive the valve stem movement of the valve, and then drive the valve core movement, which is more convenient to use. However, existing electric valves are often directly controlled by the controller to control the motor to adjust the valve opening. The specific position of the valve stem movement cannot be determined, and there is a problem of low control accuracy.

[0003] In the prior art, the invention patent with publication number CN103161582A discloses a device and method for controlling an actuator that controls the opening and closing of an intake valve. A Hall sensor is arranged in the rotating area of ​​a magnet unit to detect the polarity change of the magnet unit when it rotates. The position of the magnet is detected by the Hall sensor to determine the opening degree of the valve, and the valve opening control accuracy is higher.

[0004] However, in this patent, the valve can only be used by being driven by a motor. If a power outage, motor or transmission structure failure occurs, the valve will not be able to accept the driving force of the motor. The valve is connected to the motor drive through a worm gear and worm structure and cannot be manually operated, which seriously affects people's daily lives. Utility Model Content

[0005] In view of this, the utility model proposes a valve actuator to solve the technical problem in the above background technology that the valve cannot be manually operated as required under the premise of ensuring the valve control accuracy.

[0006] The technical solution of the utility model is achieved in this way:

[0007] The utility model provides a valve actuator, including a housing, a connecting shaft, a transmission mechanism, a driving device, a photoelectric switch and a handle, wherein:

[0008] The connecting shaft is rotatably mounted on the housing, and a sensing rod is provided on the connecting shaft along a radial direction, one end of the connecting shaft is connected to the handle, and the other end is used to connect to an external valve core;

[0009] The transmission mechanism is connected to the connecting shaft and the driving device respectively;

[0010] The driving device is mounted on the housing;

[0011] The photoelectric switch is mounted on the housing and matches the sensing rod to sense the position of the sensing rod.

[0012] In some optional embodiments, preferably, the transmission mechanism includes a worm wheel and a worm, the worm wheel is fixedly connected to the connecting shaft, and the worm is connected to the driving device and meshes with the worm wheel.

[0013] In some optional embodiments, preferably, the worm wheel is a half gear, the worm wheel is provided with a first side surface and a second side surface, the first side surface and the second side surface are parallel to the axial direction of the worm wheel, and the inner side wall of the shell is provided with a limiting portion, and the limiting portion is used to abut against the first side surface or the second side surface.

[0014] In some optional embodiments, preferably, the worm is a double-start worm.

[0015] In some optional embodiments, preferably, the helix angle of the worm wheel is greater than or equal to the friction angle of contact between the worm wheel and the worm.

[0016] In some optional embodiments, preferably, a mounting plate is provided in the housing, and the photoelectric switch is mounted on a side of the mounting plate away from the worm gear.

[0017] In some optional embodiments, preferably, the photoelectric switch is provided in plurality, and the plurality of photoelectric switches are arranged in a circle with the axis of the connecting shaft as the center.

[0018] In some optional embodiments, preferably, a sensing portion is provided at one end of the sensing rod away from the connecting axis, and the photoelectric switch is provided with a sensing slot, and when the sensing portion is located in the sensing slot, the photoelectric switch senses that the sensing rod has reached the position of the photoelectric switch.

[0019] In some optional embodiments, preferably, the sensing portion is in an inverted U shape.

[0020] In some optional embodiments, preferably, the driving device includes a driving motor and a reducer, and the reducer is connected to the driving motor and the worm respectively.

[0021] The valve actuator of the utility model has the following beneficial effects compared with the prior art:

[0022] (1) The connecting shaft is provided with a sensing rod along the radial direction, and the photoelectric switch senses the position of the sensing rod, and can accurately sense the specific position of the connecting shaft rotation, thereby improving the control accuracy; one end of the connecting shaft is connected to the handle, and the transmission mechanism is respectively connected to the connecting shaft and the driving device, so that the connecting shaft can be driven to rotate automatically by the driving device and the transmission mechanism, or can be manually controlled to rotate by the handle, thereby realizing automatic and manual operation of the valve and improving the reliability of the device;

[0023] (2) The worm wheel is a half gear, the worm wheel is provided with a first side surface and a second side surface, and the inner side wall of the housing is provided with a limiting portion, the limiting portion is used to abut against the first side surface or the second side surface, so as to achieve mechanical limiting of the rotation of the worm wheel, avoid the worm wheel and the worm from being out of meshing, and improve the reliability and stability of the device;

[0024] (3) The worm is a double-headed worm, and when the worm rotates one circle, the worm wheel rotates two teeth, so that when the worm wheel drives the worm to rotate, it can be more labor-saving, so that the operator can use less force when using the handle to operate, thereby improving the reliability of the device; and the self-locking force of the double-headed worm is small, and the operator can use less force to make the handle start to rotate;

[0025] (4) By making the helix angle of the worm wheel greater than or equal to the friction angle between the worm wheel and the worm, the transmission mechanism does not have a self-locking capability, which makes it easier to rotate the handle. The worm can be locked by a drive motor used by the drive device, and the worm wheel can be rotated by using the handle to overcome the locking force of the drive motor;

[0026] (5) The inverted U-shape of the sensing part allows the sensing part to occupy a smaller space, so that the size of the shell along the axial direction of the connecting shaft can be smaller, the structure is more compact, the device is more compact, and the installation of the valve actuator is convenient while reducing the overall volume of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a cross-sectional view of the valve actuator of the utility model;

[0029] Figure 2 The three-dimensional structure of the valve actuator of the utility model Figure 1 ;

[0030] Figure 3 The three-dimensional structure of the valve actuator of the utility model Figure 2 ;

[0031] Figure 4 It is a structural schematic diagram of the valve actuator of the utility model without the housing;

[0032] Figure 5 It is a three-dimensional diagram of the connecting shaft, transmission mechanism and driving device of the utility model;

[0033] Figure 6 A three-dimensional diagram of the worm gear of the present invention

[0034] Figure 7 It is a three-dimensional diagram of the shell of the utility model.

[0035] Description of reference numerals: 1-housing, 2-connecting shaft, 3-transmission mechanism, 4-driving device, 5-photoelectric switch, 6-handle, 7-first bearing, 8-second bearing, 9-mounting plate;

[0036] 11-limiting part, 12-ear seat, 13-adapter socket;

[0037] 21-sensing rod, 211-sensing part, 22-notch part, 23-connecting hole;

[0038] 31-worm wheel, 311-first side surface, 312-second side surface, 32-worm;

[0039] 41-driving motor, 42-reducing gear;

[0040] 51-sensing slot;

[0041] 91-Fixing holes. DETAILED DESCRIPTION

[0042] The following will be combined with the implementation of the utility model to clearly and completely describe the technical solutions in the implementation of the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] Reference Figure 1-Figure 7 As shown, the embodiment of the utility model proposes a valve actuator, including a housing 1, a connecting shaft 2, a transmission mechanism 3, a driving device 4, a photoelectric switch 5 and a handle 6, wherein:

[0044] The interior of the housing 1 is hollow and is used to house the connecting shaft 2, the transmission mechanism 3, the driving device 4 and the photoelectric switch 5;

[0045] The connecting shaft 2 is rotatably mounted on the housing 1, and the connecting shaft 2 is provided with a sensing rod 21 along the radial direction. One end of the connecting shaft 2 is connected to the handle 6, and the other end is used to connect to the external valve core; a notch 22 is provided on the outer wall of one end of the connecting shaft 2, and the notch 22 is connected to the mounting hole on the handle 6 to prevent the handle 6 from rotating, and a connecting hole 23 is provided along the axial direction of the other end of the connecting shaft 2, and the connecting hole 23 is used to connect to the external valve core, and the connecting hole 23 is flat and square, so that the connection is more stable and the stability of the device is improved; the connecting shaft 2 is connected to the housing 1 through the first bearing 7 and the second bearing 8, so that the connecting shaft 2 can rotate;

[0046] The transmission mechanism 3 is connected to the connecting shaft 2 and the driving device 4 respectively, and is used to drive the connecting shaft 2 to rotate under the drive of the driving device 4, thereby driving the valve core to rotate, so as to adjust the valve opening;

[0047] The driving device 4 is mounted on the housing 1;

[0048] The photoelectric switch 5 is mounted on the housing 1 and matches the sensing rod 21 to sense the position of the sensing rod 21 .

[0049] It should be noted that the commonly used photoelectric switch 5 uses the principle of reflection of near-infrared light beams by objects, and the synchronous circuit senses the intensity of the reflected light to detect the existence of the object to achieve its function. The photoelectric sensor first sends an infrared light beam to reach or pass through the object or mirror to reflect the infrared light beam, and the photoelectric sensor receives the reflected light beam and determines the existence of the object according to the intensity of the light beam. The above are all the sensing principles of the photoelectric switch 5 used in the prior art, and the utility model does not involve improvements in the circuit or program of the photoelectric switch 5.

[0050] The valve actuator provided in this embodiment is provided with a sensing rod 21 in the radial direction through the connecting shaft 2. The photoelectric switch 5 senses the position of the sensing rod 21, and can accurately sense the specific position of the rotation of the connecting shaft 2, thereby improving the control accuracy; one end of the connecting shaft 2 is connected to the handle 6, and the transmission mechanism 3 is respectively connected to the connecting shaft 2 and the driving device 4. The connecting shaft 2 can be driven to rotate automatically through the driving device 4 and the transmission mechanism 3, and the connecting shaft 2 can also be manually controlled to rotate through the handle 6, thereby realizing automatic and manual operation of the valve and improving the reliability of the device.

[0051] In some embodiments, the transmission mechanism 3 includes a worm wheel 31 and a worm 32, wherein the worm wheel 31 is fixedly connected to the connecting shaft 2, and the worm 32 is connected to the driving device 4 and meshes with the worm wheel 31. The worm wheel 31 is fixed to the connecting shaft 2 by a key connection, and the worm 32 is connected to the driving device 4 and meshes with the worm wheel 31. The driving device 4 drives the worm 32 to rotate, thereby driving the worm wheel 31 to rotate, so as to drive the connecting shaft 2 to rotate together, thereby realizing the adjustment of the valve opening.

[0052] In some embodiments, the worm wheel 31 is a half gear, the worm wheel 31 is provided with a first side surface 311 and a second side surface 312, the first side surface 311 and the second side surface 312 are parallel to the axial direction of the worm wheel 31, and the inner side wall of the housing 1 is provided with a limiting portion 11, the limiting portion 11 is provided on the side of the worm wheel 31 away from the worm 32, and the limiting portion 11 is used to abut against the first side surface 311 or the second side surface 312. By the worm wheel 31 being a half gear, the worm wheel 31 being provided with a first side surface 311 and a second side surface 312, and the inner side wall of the housing 1 being provided with a limiting portion 11, the limiting portion 11 is used to abut against the first side surface 311 or the second side surface 312, the mechanical limiting of the rotation of the worm wheel 31 is achieved, so that the worm wheel 31 and the worm 32 are always kept in meshing, and the worm wheel 31 and the worm 32 are prevented from being out of meshing, thereby improving the reliability and stability of the device.

[0053] In some embodiments, the worm 32 is a double-ended worm. When the worm 32 rotates one circle, the worm wheel 31 rotates two teeth, so that when the worm wheel 31 drives the worm 32 to rotate, it can save more effort, so that the operator can use less force when using the handle 6 to operate, thereby improving the reliability of the device; and the self-locking force of the double-ended worm is small, and the operator can use less force to make the handle 6 start to rotate.

[0054] In some embodiments, the helix angle of the worm wheel 31 is greater than or equal to the friction angle of the worm wheel 31 and the worm 32. By making the helix angle of the worm wheel 31 greater than or equal to the friction angle of the worm wheel 31 and the worm 32, the transmission mechanism 3 does not have a self-locking capability, and the handle 6 can be more convenient to rotate. The worm 32 can be locked by the drive motor 41 used by the drive device 4, and the worm wheel 31 can be rotated by using the handle 6 to overcome the locking force of the drive motor 41.

[0055] In some embodiments, a mounting plate 9 is provided in the housing 1, and the photoelectric switch 5 is installed on the side of the mounting plate 9 away from the worm gear 31. A fixing hole is provided on the mounting plate 9, and an ear seat 12 is provided on the housing 1. The mounting plate 9 is connected to the housing 1 by bolts passing through the fixing hole and connected with the threaded hole of the ear seat 12, so as to realize the connection between the mounting plate 9 and the housing 1. The plane where the mounting plate 9 is located is parallel to the radial direction of the connecting shaft 2. The photoelectric switch 5 is provided on the side of the mounting plate 9 away from the worm gear 31, which can avoid the light generated by the meshing of the worm gear 31 and the worm 32 from interfering with the photoelectric switch 5, thereby improving the reliability and stability of the device.

[0056] In some embodiments, the photoelectric switch 5 is provided in plurality, and the plurality of photoelectric switches 5 are arranged around the axis of the connecting shaft 2. Figure 4 As shown, two photoelectric switches 5 are arranged circumferentially with the axis of the connecting shaft 2 as the center, and the angular interval of the two photoelectric switches 5 is 120 degrees. Through the photoelectric switches 5 arranged circumferentially, the situation where the connecting shaft 2 rotates to different positions in the circumferential direction can be well detected. According to the sensitivity requirements, more photoelectric switches 5 can be set to detect more positions and improve the control accuracy.

[0057] In some embodiments, the sensing rod 21 is provided with a sensing portion 211 at one end away from the connecting shaft 2, and the photoelectric switch 5 is provided with a sensing slot 51. When the sensing portion 211 is located in the sensing slot 51, the photoelectric switch 5 senses that the sensing rod 21 has reached the position of the photoelectric switch 5. The sensing portion 211 is provided at the end of the sensing rod 21 away from the connecting shaft 2, and the photoelectric switch 5 is provided with a sensing slot 51. When the sensing portion 211 passes through the sensing slot 51, the signal is blocked, so that the sensing rod 21 is sensed to rotate to this position, so that the rotation angle of the connecting shaft 2 is known, and the opening of the valve is known.

[0058] In some embodiments, the sensing portion 211 is in an inverted U shape. The inverted U shape of the sensing portion 211 allows the sensing portion 211 to occupy a smaller space in the axial direction of the connecting shaft 2, so that the size of the housing 1 in the axial direction of the connecting shaft 2 can be smaller, the structure is more compact, the device is more compact, and the installation of the valve actuator is convenient while reducing the overall volume of the valve. One end of the sensing portion 211 is long and the other end is short, and the longer end is used to pass through the sensing slot 51.

[0059] In some embodiments, the driving device 4 includes a driving motor 41 and a reducer 42, and the reducer 42 is respectively connected to the driving motor 41 and the worm 32. The driving motor 41 drives the reducer 42 to move, and the reducer 42 transmits the driving force to the worm 32 after deceleration, so that the speed of the worm 32 is not too fast, thereby improving the stability of the valve switch.

[0060] In some embodiments, the housing 1 is further provided with a transfer socket 13, one end of which is electrically connected to the photoelectric switch 5, and the other end is used to plug in an external signal line. By electrically connecting one end of the transfer socket 13 to the photoelectric switch 5 and the other end to plug in an external signal line, the wiring of the photoelectric switch 5 is facilitated, thereby improving the convenience and efficiency of assembly.

[0061] The working principle of the valve actuator is as follows: the driving device 4 drives the worm 32 to rotate, thereby driving the worm wheel 31 to rotate, so as to drive the connecting shaft 2 to rotate together, so as to adjust the valve opening; during the rotation of the connecting shaft 2, the sensing rod 21 rotates together, and when the sensing part 211 passes through the sensing slot 51 of the photoelectric switch 5, the signal is blocked, so that the sensing rod 21 is sensed to rotate to this position, so as to know the rotation angle of the connecting shaft 2, and the valve opening can be monitored to improve the control accuracy of the valve opening; one end of the connecting shaft 2 is connected to the handle 6, and the connecting shaft 2 can be driven to rotate by rotating the handle 6. The connecting shaft 2 can be driven to rotate automatically by the driving device 4 and the transmission mechanism 3, and can also be manually controlled to rotate by the handle 6, so that the automatic and manual operation of the valve is realized, and the reliability of the device is improved.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A valve actuator, characterized in that: It includes a housing, a connecting shaft, a transmission mechanism, a driving device, a photoelectric switch and a handle, wherein: The connecting shaft is rotatably mounted on the housing, and a sensing rod is provided on the connecting shaft along a radial direction, one end of the connecting shaft is connected to the handle, and the other end is used to connect to an external valve core; The transmission mechanism is connected to the connecting shaft and the driving device respectively; The driving device is mounted on the housing; The photoelectric switch is mounted on the housing and matches the sensing rod to sense the position of the sensing rod.

2. The valve actuator according to claim 1, characterized in that: The transmission mechanism comprises a worm wheel and a worm, wherein the worm wheel is fixedly connected to the connecting shaft, and the worm is connected to the driving device and meshes with the worm wheel.

3. The valve actuator according to claim 2, characterized in that: The worm wheel is a half gear, and is provided with a first side surface and a second side surface, wherein the first side surface and the second side surface are parallel to the axial direction of the worm wheel, and an inner side wall of the shell is provided with a limiting portion, and the limiting portion is used to abut against the first side surface or the second side surface.

4. The valve actuator according to claim 3, characterized in that: The worm is a double-start worm.

5. The valve actuator according to claim 4, characterized in that: The helix angle of the worm wheel is greater than or equal to the friction angle of contact between the worm wheel and the worm.

6. The valve actuator according to claim 5, characterized in that: A mounting plate is arranged in the housing, and the photoelectric switch is mounted on a side of the mounting plate away from the worm gear.

7. The valve actuator according to claim 6, characterized in that: A plurality of the photoelectric switches are provided, and the plurality of the photoelectric switches are arranged in a circle with the axis of the connecting shaft as the center circumference.

8. The valve actuator according to claim 7, characterized in that: The sensing rod is provided with a sensing portion at one end away from the connecting shaft, and the photoelectric switch is provided with a sensing slot. When the sensing portion is located in the sensing slot, the photoelectric switch senses that the sensing rod has reached the position of the photoelectric switch.

9. The valve actuator according to claim 8, characterized in that: The sensing portion is in an inverted U shape.

10. The valve actuator according to any one of claims 2 to 8, characterized in that: The driving device comprises a driving motor and a reducer, and the reducer is connected to the driving motor and the worm respectively.

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