Dual-redundancy electric valve actuating mechanism

Abstract

The utility model provides a dual-redundancy electric valve actuating mechanism which comprises a reduction gearbox body, a first driving device, a second driving device, a first transmission mechanism, a second transmission mechanism, a two-to-one mechanism and a valve rod. The first driving device and the second driving device are respectively connected with the first transmission mechanism and the second transmission mechanism; in the two-to-one mechanism, a first bevel gear with a shaft and a second bevel gear with a shaft are respectively connected with a first transmission mechanism and a second transmission mechanism; the third bevel gear with the shaft is rotationally mounted on a second shaft section of the second bevel gear with the shaft and is meshed with the fourth bevel gear with the shaft; the fifth bevel gear with the shaft and the sixth bevel gear with the shaft are both connected with the third bevel gear with the shaft and are both meshed with the first bevel gear with the shaft and the second bevel gear with the shaft; and the valve rod is connected and coaxial with a fourth shaft section of the fourth bevel gear with the shaft. One of the first transmission mechanism and the second transmission mechanism is selected to drive the valve rod to rotate through the two-to-one mechanism, parts are reduced, the structure is simple, the occupied space is small, and the applicability is good.

Description

Technical Field

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

[0002] Valves are commonly used products in people's daily lives. They are connected to water supply or gas pipelines to control the opening and closing of the pipelines or regulate the flow rate in the pipelines. Currently, relatively common valves often change the opening of the valve by manually turning a handle to rotate the valve core inside the valve. With the increasing requirements for intelligence and automation, electric valves have emerged and gradually become popular in the valve field. They cooperate with a motor through a controller, an operation panel or a sensor to automatically drive the valve stem to move, and then drive the valve core to move, which is relatively convenient to use. In some usage scenarios that pay more attention to stability, two driving motors are used to drive the valve stem to move, achieving the effect of one in use and one in reserve to improve stability.

[0003] However, in the prior art, when using two driving motors, the transmission mechanism generally uses two clutches to connect the two driving motors and the valve stem. Its structure is relatively complex, occupies a large space, is not suitable for valves with a small volume, and has low applicability. Summary of the Utility Model

[0004] In view of this, the utility model provides a dual-redundancy electric valve actuator to solve the technical problems in the above background art that the transmission mechanism generally uses clutches to connect two driving motors and the valve stem, with a relatively complex structure, a large occupied space, not being suitable for valves with a small volume, and having low applicability.

[0005] The technical solution of the utility model is realized as follows:

[0006] The utility model provides a dual-redundancy electric valve actuator, which includes a reduction gearbox body, a first driving device, a second driving device, a first transmission mechanism, a second transmission mechanism, a two-in-one mechanism and a valve stem, wherein:

[0007] The first driving device and the second driving device are installed in parallel outside the reduction gearbox body and are respectively connected to the first transmission mechanism and the second transmission mechanism;

[0008] The two-to-one mechanism includes a first bevel gear with an axis, a second bevel gear with an axis, a third bevel gear with an axis, a fourth bevel gear with an axis, a first support seat, a second support seat, a fifth bevel gear with an axis and a sixth bevel gear with an axis. The first bevel gear with an axis and the second bevel gear with an axis are mirror-symmetrically mounted on the reduction gear box and are coaxial, and are respectively connected to the first transmission mechanism and the second transmission mechanism; the third bevel gear with an axis is rotatably mounted on the second shaft segment of the second bevel gear with an axis and meshes with the fourth bevel gear with an axis; the fourth bevel gear with an axis is rotatably mounted on the reduction gear box; the first support seat and the second support seat are fixedly mounted on the same end face of the third bevel gear with an axis; the fifth bevel gear with an axis and the sixth bevel gear with an axis are respectively rotatably mounted on the first support seat and the second support seat, and are both meshed with the first bevel gear with an axis and the second bevel gear with an axis, the fifth bevel gear with an axis and the sixth bevel gear with an axis are coaxial, and the axis of the fifth bevel gear with an axis is perpendicular to the axis of the first bevel gear with an axis and are located in the same plane;

[0009] The valve stem is connected to the fourth shaft section of the fourth shaft bevel gear and is coaxial with the fourth shaft section.

[0010] On the basis of the above technical solution, preferably, a coaxial first sleeve and a second sleeve are provided in the reduction gearbox body;

[0011] The dual-redundant electric valve actuator also includes a first bearing and a second bearing, the first bearing is built into the first sleeve and connected thereto, the second bearing is built into the second sleeve and connected thereto, and the two ends of the first shaft section of the first shaft bevel gear are respectively installed in the first bearing and the second bearing.

[0012] On the basis of the above technical solution, preferably, a third sleeve coaxial with the first sleeve is further provided at one end of the reduction gearbox away from the first sleeve, and a fourth sleeve coaxial with the third sleeve is provided at the middle of the inner wall of the reduction gearbox;

[0013] The dual-redundant electric valve actuator also includes a third bearing, a fourth bearing and a fifth bearing; the third bearing is built into the third sleeve and connected to it; the fourth bearing is built into the fourth sleeve and connected to it, and the third shaft section of the third shaft bevel gear is installed in the fourth bearing; the fifth bearing is built into the inner hole of the third shaft bevel gear, and the two ends of the second shaft section of the second shaft bevel gear are respectively installed in the third bearing and the fifth bearing.

[0014] On the basis of the above technical solution, preferably, a fifth sleeve is provided at a position of the reduction housing close to the valve stem, and the axis of the fifth sleeve is perpendicular to the axis of the third sleeve;

[0015] The dual-redundancy electric valve actuator further includes a sixth bearing, which is built in and connected to the fifth bushing, and the fourth shaft section is installed in the sixth bearing.

[0016] Based on the above technical solutions, preferably, the first transmission mechanism includes a first worm gear and a first worm. The first worm gear is fixedly connected to the first shaft section of the first shafted bevel gear, and the first worm is connected to the first driving device and meshes with the first worm gear.

[0017] Based on the above technical solutions, preferably, the second transmission mechanism includes a second worm gear and a second worm. The second worm gear is fixedly connected to the second shaft section of the second shafted bevel gear, and the second worm is connected to the second driving device and meshes with the second worm gear.

[0018] Based on the above technical solutions, preferably, a sensing rod is provided on the valve stem;

[0019] The dual-redundancy electric valve actuator further includes a photoelectric switch and a mounting plate. The mounting plate is located inside the speed reducer housing and fixedly connected thereto, and the photoelectric switch is installed on the mounting plate for sensing the position of the sensing rod.

[0020] Based on the above technical solutions, preferably, a plurality of photoelectric switches are provided, and the plurality of photoelectric switches are circumferentially arranged with the axis of the valve stem as the center line.

[0021] Based on the above technical solutions, preferably, a seventh bearing and an eighth bearing are further included;

[0022] The first support seat includes a first arc plate and a first support plate. The first arc plate is coaxial with and connected to the third shafted bevel gear. The first support plate is tangent to the first arc plate. A first mounting hole is provided on the first support plate, and the seventh bearing is embedded in the first mounting hole. The fifth shaft section of the fifth shafted bevel gear is installed in the seventh bearing;

[0023] The second support seat includes a second arc plate and a second support plate. The second arc plate is coaxial with and connected to the third shafted bevel gear. The second support plate is tangent to the second arc plate. A second mounting hole is provided on the second support plate, and the eighth bearing is embedded in the second mounting hole. The sixth shaft section of the sixth shafted bevel gear is installed in the eighth bearing.

[0024] Based on the above technical solutions, preferably, a motor cover is further included. The motor cover is connected to the speed reducer housing and covers the first driving device and the second driving device.

[0025] The dual-redundancy electric valve actuator of the present utility model has the following beneficial effects compared with the prior art:

[0026] (1) It is rotatably mounted on the second shaft section of the second bevel gear with shaft through the third bevel gear with shaft and meshes with the fourth bevel gear with shaft;

[0027] When the first driving device drives the first bevel gear with shaft to rotate through the first transmission mechanism, the second bevel gear with shaft is locked and immovable due to the non-operation of the second driving device. The first bevel gear with shaft drives the fifth bevel gear with shaft and the sixth bevel gear with shaft to rotate, thereby driving the third bevel gear with shaft to rotate around the second bevel gear with shaft to drive the fourth bevel gear with shaft to rotate, realizing the rotation of the valve stem;

[0028] When the second driving device drives the second bevel gear with shaft to rotate through the second transmission mechanism, the first bevel gear with shaft is locked and immovable due to the non-operation of the first driving device. The second bevel gear with shaft drives the fifth bevel gear with shaft and the sixth bevel gear with shaft to rotate, thereby driving the third bevel gear with shaft to rotate together to drive the fourth bevel gear with shaft to rotate, realizing the rotation of the valve stem;

[0029] The above structure realizes the rotation of the valve stem controlled by two-way input of the first transmission mechanism and the second transmission mechanism through a two-in-one mechanism. At the same time, when one of the first driving device and the second driving device works, it is not affected by the other. And through a two-in-one mechanism, the two-way drive can be converted into the output of the valve stem, reducing the number of parts, having a relatively simple structure, reducing the occupied space, being applicable to valves with a small volume, and improving the applicability;

[0030] (2) The third bearing is built into and connected with the third shaft sleeve; the fifth bearing is built into the inner hole of the third bevel gear with shaft, and both ends of the second shaft section of the second bevel gear with shaft are respectively installed in the third bearing and the fifth bearing, realizing the rotatable installation of the second bevel gear with shaft on the reduction gearbox body; the fourth bearing is built into and connected with the fourth shaft sleeve, and the third shaft section of the third bevel gear with shaft is installed in the fourth bearing. The fourth bearing and the fifth bearing realize the rolling support on the inner side and the outer side of the third bevel gear with shaft, realizing the rotatable installation of the third bevel gear with shaft on the second shaft section of the second bevel gear with shaft, and at the same time realizing the rotational connection of one end of the second shaft section of the second bevel gear with shaft with the reduction gearbox body;

[0031] (3) The reduction gearbox body is provided with a coaxial first shaft sleeve and a second shaft sleeve; the first bearing is built into and connected with the first shaft sleeve, the second bearing is built into and connected with the second shaft sleeve, and both ends of the first shaft section of the first bevel gear with shaft are respectively installed in the first bearing and the second bearing, realizing the rotatable installation of the first bevel gear with shaft on the reduction gearbox body;

[0032] (4) A fifth shaft sleeve is provided at a position of the reduction housing close to the valve stem, the sixth bearing is built into the fifth shaft sleeve and connected thereto, and the fourth shaft segment is installed in the sixth bearing, so as to realize a rotatable connection between the fourth shaft bevel gear and the reduction housing;

[0033] (5) The first arc plate is coaxial with the third bevel gear with shaft and connected thereto, the first support plate is tangent to the first arc plate, a first mounting hole is provided on the first support plate, the seventh bearing is embedded in the first mounting hole, and the fifth shaft segment of the fifth bevel gear with shaft is installed in the seventh bearing, so as to realize the rotatable connection between the fifth bevel gear with shaft and the first support seat;

[0034] The second arc plate is coaxial with the third bevel gear with shaft and connected thereto, the second support plate is tangent to the second arc plate, a second mounting hole is provided on the second support plate, the eighth bearing is embedded in the second mounting hole, and the sixth shaft segment of the sixth bevel gear with shaft is installed in the eighth bearing, so as to realize the rotatable connection between the sixth bevel gear with shaft and the second support seat;

[0035] When the first shaft bevel gear or the second shaft bevel gear drives the fifth shaft bevel gear and the sixth shaft bevel gear to mesh and rotate simultaneously, the third shaft bevel gear rotates, thereby driving the fourth shaft bevel gear to rotate, thereby realizing the rotation of the valve stem. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] 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.

[0037] Figure 1 It is a cross-sectional view of the double-redundant electric valve actuator of the utility model;

[0038] Figure 2 It is a three-dimensional diagram of the double-redundant electric valve actuator of the utility model;

[0039] Figure 3 A three-dimensional diagram of the double-redundant electric valve actuator of the utility model without the motor cover;

[0040] Figure 4 This is a three-dimensional diagram of the double-redundant electric valve actuator of the utility model without the motor cover and the reduction box body;

[0041] Figure 5A perspective view of the first transmission mechanism, the second transmission mechanism, and the two-into-one mechanism of the present utility model;

[0042] Figure 6 A perspective view of the two-into-one mechanism of the present utility model;

[0043] Figure 7 A perspective view of the first support base of the present utility model;

[0044] Figure 8 A perspective view of the second support base of the present utility model;

[0045] Figure 9 A sectional view of the speed reduction gearbox of the present utility model.

[0046] Explanation of reference numerals in the drawings: 1 - first driving device, 2 - second driving device, 3 - speed reduction gearbox, 4 - first transmission mechanism, 5 - second transmission mechanism, 6 - two-into-one mechanism, 7 - valve rod, 8 - first bearing, 9 - second bearing, 10 - third bearing, 11 - fourth bearing, 12 - fifth bearing, 13 - sixth bearing, 14 - photoelectric switch, 15 - mounting plate, 16 - seventh bearing, 17 - eighth bearing, 18 - motor cover, 19 - adapter socket;

[0047] 31 - first shaft sleeve, 32 - second shaft sleeve, 33 - third shaft sleeve, 34 - fourth shaft sleeve, 35 - fifth shaft sleeve;

[0048] 41 - first worm gear, 42 - first worm;

[0049] 51 - second worm gear, 52 - second worm;

[0050] 61 - first shaft-mounted bevel gear, 62 - second shaft-mounted bevel gear, 63 - third shaft-mounted bevel gear, 64 - fourth shaft-mounted bevel gear, 65 - first support base, 651 - first arc-shaped plate, 652 - first support plate, 6521 - first mounting hole, 66 - second support base, 661 - second arc-shaped plate, 662 - second support plate, 6621 - second mounting hole, 67 - fifth shaft-mounted bevel gear, 68 - sixth shaft-mounted bevel gear;

[0051] 71 - sensing rod;

[0052] 141 - sensing groove. Detailed implementation manner

[0053] The following will describe the technical solutions in the embodiments of the present utility model in a clear and complete manner in combination with the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0054] Referring to Figures 1-9 As shown, an embodiment of the present utility model provides a dual-redundancy electric valve actuator, which includes a reduction gearbox 3, a first driving device 1, a second driving device 2, a first transmission mechanism 4, a second transmission mechanism 5, a two-into-one mechanism 6, and a valve stem 7, wherein:

[0055] The first driving device 1 and the second driving device 2 are installed in parallel outside the reduction gearbox 3 and are respectively connected to the first transmission mechanism 4 and the second transmission mechanism 5;

[0056] The two-into-one mechanism 6 includes a first shaft-mounted bevel gear 61, a second shaft-mounted bevel gear 62, a third shaft-mounted bevel gear 63, a fourth shaft-mounted bevel gear 64, a first support seat 65, a second support seat 66, a fifth shaft-mounted bevel gear 67, and a sixth shaft-mounted bevel gear 68. The first shaft-mounted bevel gear 61 and the second shaft-mounted bevel gear 62 are rotationally installed on the reduction gearbox 3 in a mirror-symmetrical manner and are coaxial, and are respectively connected to the first transmission mechanism 4 and the second transmission mechanism 5; the third shaft-mounted bevel gear 63 is rotationally installed on the second shaft section of the second shaft-mounted bevel gear 62 and meshes with the fourth shaft-mounted bevel gear 64; the fourth shaft-mounted bevel gear 64 is rotationally installed on the reduction gearbox 3; the first support seat 65 and the second support seat 66 are fixedly installed on the same end face of the third shaft-mounted bevel gear 63; the fifth shaft-mounted bevel gear 67 and the sixth shaft-mounted bevel gear 68 are respectively rotationally installed on the first support seat 65 and the second support seat 66, and both mesh with the first shaft-mounted bevel gear 61 and the second shaft-mounted bevel gear 62. The fifth shaft-mounted bevel gear 67 and the sixth shaft-mounted bevel gear 68 are coaxial, and the axis of the fifth shaft-mounted bevel gear 67 is perpendicular to the axis of the first shaft-mounted bevel gear 61 and is located in the same plane;

[0057] The valve stem 7 is connected to and coaxial with the fourth shaft section of the fourth shaft-mounted bevel gear 64.

[0058] It should be noted that the first driving device 1 and the second driving device 2 do not participate in the work at the same time. Only one of them provides driving force when the dual-redundancy electric valve actuator is working, that is:

[0059] When the first driving device 1 drives the first belt shaft bevel gear 61 to rotate through the first transmission mechanism 4, and the second belt shaft bevel gear 62 is locked and immovable because the second driving device 2 does not act, the first belt shaft bevel gear 61 drives the fifth belt shaft bevel gear 67 and the sixth belt shaft bevel gear 68 to rotate, thereby driving the third belt shaft bevel gear 63 to rotate around the second belt shaft bevel gear 62 to drive the fourth belt shaft bevel gear 64 to rotate, realizing the rotation of the valve stem 7;

[0060] When the second driving device 2 drives the second belt shaft bevel gear 62 to rotate through the second transmission mechanism 5, and the first belt shaft bevel gear 61 is locked and immovable because the first driving device 1 does not act, the second belt shaft bevel gear 62 drives the fifth belt shaft bevel gear 67 and the sixth belt shaft bevel gear 68 to rotate, thereby driving the third belt shaft bevel gear 63 to rotate together to drive the fourth belt shaft bevel gear 64 to rotate, realizing the rotation of the valve stem 7.

[0061] The dual-redundancy electric valve actuator provided in this embodiment realizes the rotation of the valve stem 7 controlled by two-way inputs of the first transmission mechanism 4 and the second transmission mechanism 5 through the two-in-one mechanism 6. At the same time, when one of the first driving device 1 and the second driving device 2 works, it is not affected by the other, and the two-way drive can be converted into the output of the valve stem 7 through a two-in-one mechanism 6, reducing the number of parts, having a relatively simple structure, reducing the occupied space, being applicable to valves with a relatively small volume, and improving the applicability.

[0062] In some embodiments, a coaxial first shaft sleeve 31 and a second shaft sleeve 32 are arranged in the reduction gearbox 3. The first shaft sleeve 31 is located at one end of the inner wall of the reduction gearbox 3, and the second shaft sleeve 32 is located in the middle of the inner wall of the reduction gearbox 3; the dual-redundancy electric valve actuator further includes a first bearing 8 and a second bearing 9. The first bearing 8 is placed in and connected to the first shaft sleeve 31, and the second bearing 9 is placed in and connected to the second shaft sleeve 32. Both ends of the first shaft section of the first belt shaft bevel gear 61 are respectively installed in the first bearing 8 and the second bearing 9. By arranging the coaxial first shaft sleeve 31 and the second shaft sleeve 32 in the reduction gearbox 3; the first bearing 8 is placed in and connected to the first shaft sleeve 31, the second bearing 9 is placed in and connected to the second shaft sleeve 32, and both ends of the first shaft section of the first belt shaft bevel gear 61 are respectively installed in the first bearing 8 and the second bearing 9, the first belt shaft bevel gear 61 is rotatably installed on the reduction gearbox 3, providing support for the first belt shaft bevel gear 61. When the first transmission mechanism 4 transmits the driving force of the first driving device 1 to the first belt shaft bevel gear 61, the first belt shaft bevel gear 61 can rotate, improving the reliability and stability of the device.

[0063] In some embodiments, a third bushing 33 coaxial with the first bushing 31 is further provided at one end of the speed reduction housing 3 away from the first bushing 31, and a fourth bushing 34 coaxial with the third bushing 33 is provided in the middle of the inner wall of the speed reduction housing 3; the dual-redundancy electric valve actuator further includes a third bearing 10, a fourth bearing 11, and a fifth bearing 12; the third bearing 10 is built in and connected to the third bushing 33; the fourth bearing 11 is built in and connected to the fourth bushing 34, and the third shaft section of the third shafted bevel gear 63 is installed in the fourth bearing 11; the fifth bearing 12 is built in the inner hole of the third shafted bevel gear 63, and both ends of the second shaft section of the second shafted bevel gear 62 are respectively installed in the third bearing 10 and the fifth bearing 12. By the third bearing 10 being built in and connected to the third bushing 33, the fifth bearing 12 being built in the inner hole of the third shafted bevel gear 63, and both ends of the second shaft section of the second shafted bevel gear 62 being respectively installed in the third bearing 10 and the fifth bearing 12, the second shafted bevel gear 62 is rotatably installed on the speed reduction housing 3 to provide support for the second shafted bevel gear 62. When the second transmission mechanism 5 transmits the driving force of the second driving device 2 to the second shafted bevel gear 62, the second shafted bevel gear 62 can rotate, improving the reliability and stability of the device; the fourth bearing 11 is built in and connected to the fourth bushing 34, and the third shaft section of the third shafted bevel gear 63 is installed in the fourth bearing 11. The fourth bearing 11 and the fifth bearing 12 achieve rolling support on the inner and outer sides of the third shafted bevel gear 63, realizing that the third shafted bevel gear 63 is rotatably installed on the second shaft section of the second shafted bevel gear 62. The third shafted bevel gear 63 can rotate relative to the second shafted bevel gear 62, and at the same time, one end of the second shaft section of the second shafted bevel gear 62 is rotatably connected to the speed reduction housing 3.

[0064] In some embodiments, a fifth bushing 35 is provided at a position of the speed reduction housing 3 close to the valve stem 7, and the axis of the fifth bushing 35 is perpendicular to the axis of the third bushing 33; the dual-redundancy electric valve actuator further includes a sixth bearing 13, the sixth bearing 13 is built in and connected to the fifth bushing 35, and the fourth shaft section is installed in the sixth bearing 13. By the speed reduction housing 3 being provided with a fifth bushing 35 at a position close to the valve stem 7, the sixth bearing 13 being built in and connected to the fifth bushing 35, and the fourth shaft section being installed in the sixth bearing 13, the fourth shafted bevel gear 64 is rotatably connected to the speed reduction housing 3.

[0065] In some embodiments, the first transmission mechanism 4 includes a first worm gear 41 and a first worm 42. The first worm gear 41 is fixedly connected to the first shaft section of the first belt shaft bevel gear 61, and the first worm 42 is connected to the first driving device 1 and meshes with the first worm gear 41. By driving the first worm 42 to rotate through the first driving device 1, the first worm gear 41 is driven to rotate, thereby driving the first shaft section of the first belt shaft bevel gear 61 to rotate, so that the first belt shaft bevel gear 61 drives the fifth belt shaft bevel gear 67 and the sixth belt shaft bevel gear 68 to rotate. The first driving device 1 can be a motor.

[0066] In some embodiments, the second transmission mechanism 5 includes a second worm gear 51 and a second worm 52. The second worm gear 51 is fixedly connected to the second shaft section of the second belt shaft bevel gear 62, and the second worm 52 is connected to the second driving device 2 and meshes with the second worm gear 51. By driving the second worm 52 to rotate through the second driving device 2, the second worm gear 51 is driven to rotate, thereby driving the second shaft section of the second belt shaft bevel gear 62 to rotate, so that the second belt shaft bevel gear 62 drives the fifth belt shaft bevel gear 67 and the sixth belt shaft bevel gear 68 to rotate. The first driving device 1 can be a motor.

[0067] In some embodiments, an induction rod 71 is provided on the valve stem 7; the dual-redundancy electric valve actuator further includes a photoelectric switch 14 and a mounting plate 15. The mounting plate 15 is located inside the reduction gearbox 3 and is fixedly connected thereto, and the photoelectric switch 14 is mounted on the mounting plate 15 for sensing the position of the induction rod 71. By providing the induction rod 71 along the radial direction on the valve stem 7 and the photoelectric switch 14 sensing the position of the induction rod 71, the specific position of the rotation of the valve stem 7 can be accurately sensed, improving the control accuracy.

[0068] It should be noted that the commonly used photoelectric switch 14 utilizes the reflection principle of an object to an infrared beam. The function is realized by the synchronous circuit sensing the intensity of the reflected light. The photoelectric sensor first emits an infrared beam to reach or pass through an object or a mirror to reflect the infrared beam. The photoelectric sensor receives the reflected beam and judges the existence of the object according to the intensity of the beam. The above are all the induction principles of the photoelectric switch 14 using the prior art. The present invention does not involve improvements in the circuit or program of the photoelectric switch 14.

[0069] In some embodiments, an induction part is provided at one end of the induction rod 71 away from the valve rod 7. The photoelectric switch 14 is provided with an induction groove 141. When the induction part is located in the induction groove 141, the photoelectric switch 14 senses that the induction rod 71 reaches the position where the photoelectric switch 14 is located. By arranging the induction part at one end of the induction rod 71 away from the valve rod 7 and providing an induction groove 141 in the photoelectric switch 14, when the induction part passes through the induction groove 141, the signal is blocked, so as to sense that the induction rod 71 rotates to this position, thereby knowing the rotation angle of the valve rod 7 and the opening degree of the valve.

[0070] In some embodiments, a plurality of the photoelectric switches 14 are provided, and the plurality of photoelectric switches 14 are arranged circumferentially with the axis of the valve rod 7 as the center line. Two photoelectric switches 14 are arranged circumferentially with the axis of the valve rod 7 as the center, and the angular interval between the two photoelectric switches 14 is 120 degrees. Through the circumferentially arranged photoelectric switches 14, the situation that the valve rod 7 rotates to different positions in the circumferential direction can be detected better. Several more photoelectric switches 14 can be provided according to the requirement of sensitivity to detect more positions and improve the control accuracy.

[0071] In some embodiments, the dual-redundancy electric valve actuator further includes a seventh bearing 16 and an eighth bearing 17;

[0072] The first support seat 65 includes a first arc plate 651 and a first support plate 652. The first arc plate 651 is coaxial with and connected to the third bevel gear with a shaft 63. The first support plate 652 is tangent to the first arc plate 651. A first mounting hole 6521 is provided on the first support plate 652. The seventh bearing 16 is embedded in the first mounting hole 6521, and the fifth shaft section of the fifth bevel gear with a shaft 67 is installed in the seventh bearing 16, realizing the rotatable connection between the fifth bevel gear with a shaft 67 and the first support seat 65 and providing support for the fifth bevel gear with a shaft 67. When the driving force of the first bevel gear with a shaft 61 or the second bevel gear with a shaft 62 is transmitted to the fifth bevel gear with a shaft 67, the fifth bevel gear with a shaft 67 can rotate, improving the reliability and stability of the device;

[0073] The second support seat 66 includes a second arc plate 661 and a second support plate 662, the second arc plate 661 is coaxial with the third bevel gear 63 and connected thereto, the second support plate 662 is tangent to the second arc plate 661, and a second mounting hole 6621 is provided on the second support plate 662, the eighth bearing 17 is embedded in the second mounting hole 6621, and the sixth shaft segment of the sixth bevel gear 68 is installed in the eighth bearing 17, so that the sixth bevel gear 68 is rotatably connected to the second support seat 66, and when the driving force of the first bevel gear 61 or the second bevel gear 62 is transmitted to the sixth bevel gear 68, the sixth bevel gear 68 can rotate, thereby improving the reliability and stability of the device;

[0074] When the first shaft bevel gear 61 or the second shaft bevel gear 62 drives the fifth shaft bevel gear 67 and the sixth shaft bevel gear 68 to mesh and rotate simultaneously, the third shaft bevel gear 63 rotates, thereby driving the fourth shaft bevel gear 64 to rotate, thereby realizing the rotation of the valve stem 7.

[0075] In some embodiments, the dual-redundancy electric valve actuator further includes a motor cover 18, which is connected to the reduction box 3 and is disposed outside the first drive device 1 and the second drive device 2. The motor cover 18 is disposed outside the first drive device 1 and the second drive device 2 to provide external cover protection for the first drive device 1 and the second drive device 2, thereby preventing the first drive device 1 and the second drive device 2 from causing accidental injury to the operator during operation, thereby improving the safety and reliability of the device.

[0076] In some embodiments, the motor cover 18 is further provided with an adapter socket 19, one end of which is electrically connected to the photoelectric switch 14, and the other end is used to plug in an external signal line. By electrically connecting one end of the adapter socket 19 to the photoelectric switch 14 and the other end to plug in an external signal line, the wiring of the photoelectric switch 14 is facilitated, thereby improving the convenience and efficiency of assembly.

[0077] The working principle of the dual-redundancy electric valve actuator is: the first drive device 1 and the second drive device 2 do not work at the same time;

[0078] When the first driving device 1 drives the first shaft bevel gear 61 to rotate through the first transmission mechanism 4, the second shaft bevel gear 62 is locked because the second driving device 2 does not move, and the first shaft bevel gear 61 drives the fifth shaft bevel gear 67 and the sixth shaft bevel gear 68 to rotate, thereby driving the third shaft bevel gear 63 to rotate around the second shaft bevel gear 62, so as to drive the fourth shaft bevel gear 64 to rotate, thereby realizing the rotation of the valve stem 7;

[0079] When the second driving device 2 drives the second belt shaft bevel gear 62 to rotate through the second transmission mechanism 5, the first belt shaft bevel gear 61 is locked and immovable because the first driving device 1 does not act. The second belt shaft bevel gear 62 drives the fifth belt shaft bevel gear 67 and the sixth belt shaft bevel gear 68 to rotate, thereby driving the third belt shaft bevel gear 63 to rotate together to drive the fourth belt shaft bevel gear 64 to rotate, realizing the rotation of the valve stem 7.

[0080] The dual-redundancy electric valve actuator provided in this embodiment realizes the rotation of the valve stem 7 controlled by two inputs of the first transmission mechanism 4 and the second transmission mechanism 5 through the two-in-one mechanism 6. At the same time, when one of the first driving device 1 and the second driving device 2 works, it is not affected by the other. And through a two-in-one mechanism 6, the two-way drive can be converted into the output of the valve stem 7, reducing the number of parts, with a relatively simple structure, reducing the occupied space, being applicable to valves with a relatively small volume, and improving the applicability.

[0081] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A dual-redundancy electric valve actuator, characterized in that: It includes a reduction box, a first drive device, a second drive device, a first transmission mechanism, a second transmission mechanism, a two-to-one mechanism and a valve stem, wherein: The first driving device and the second driving device are installed in parallel outside the reduction box and are connected to the first transmission mechanism and the second transmission mechanism respectively; The two-to-one mechanism includes a first bevel gear with an axis, a second bevel gear with an axis, a third bevel gear with an axis, a fourth bevel gear with an axis, a first support seat, a second support seat, a fifth bevel gear with an axis and a sixth bevel gear with an axis. The first bevel gear with an axis and the second bevel gear with an axis are mirror-symmetrically mounted on the reduction gear box and are coaxial, and are respectively connected to the first transmission mechanism and the second transmission mechanism; the third bevel gear with an axis is rotatably mounted on the second shaft segment of the second bevel gear with an axis and meshes with the fourth bevel gear with an axis; the fourth bevel gear with an axis is rotatably mounted on the reduction gear box; the first support seat and the second support seat are fixedly mounted on the same end face of the third bevel gear with an axis; the fifth bevel gear with an axis and the sixth bevel gear with an axis are respectively rotatably mounted on the first support seat and the second support seat, and are both meshed with the first bevel gear with an axis and the second bevel gear with an axis, the fifth bevel gear with an axis and the sixth bevel gear with an axis are coaxial, and the axis of the fifth bevel gear with an axis is perpendicular to the axis of the first bevel gear with an axis and are located in the same plane; The valve stem is connected to the fourth shaft section of the fourth shaft bevel gear and is coaxial with the fourth shaft section.

2. The dual-redundancy electric valve actuator according to claim 1, characterized in that: The reduction box body is provided with a coaxial first sleeve and a second sleeve; The dual-redundant electric valve actuator also includes a first bearing and a second bearing, the first bearing is built into the first sleeve and connected thereto, the second bearing is built into the second sleeve and connected thereto, and the two ends of the first shaft section of the first shaft bevel gear are respectively installed in the first bearing and the second bearing.

3. The dual-redundancy electric valve actuator according to claim 2, characterized in that: A third sleeve coaxial with the first sleeve is further provided at one end of the reduction gear box away from the first sleeve, and a fourth sleeve coaxial with the third sleeve is provided at the middle of the inner wall of the reduction gear box; The dual-redundant electric valve actuator also includes a third bearing, a fourth bearing and a fifth bearing; the third bearing is built into the third sleeve and connected to it; the fourth bearing is built into the fourth sleeve and connected to it, and the third shaft section of the third shaft bevel gear is installed in the fourth bearing; the fifth bearing is built into the inner hole of the third shaft bevel gear, and the two ends of the second shaft section of the second shaft bevel gear are respectively installed in the third bearing and the fifth bearing.

4. The dual-redundancy electric valve actuator according to claim 3, characterized in that: A fifth sleeve is disposed at a position of the reduction housing close to the valve stem, and an axis of the fifth sleeve is perpendicular to an axis of the third sleeve; The dual-redundancy electric valve actuator also includes a sixth bearing, which is built into and connected to the fifth shaft sleeve, and the fourth shaft segment is installed in the sixth bearing.

5. The dual-redundancy electric valve actuator according to claim 1, characterized in that: The first transmission mechanism includes a first worm wheel and a first worm. The first worm wheel is fixedly connected to the first shaft section of the first shaft bevel gear. The first worm is connected to the first driving device and meshes with the first worm wheel.

6. The dual-redundancy electric valve actuator according to claim 1, characterized in that: The second transmission mechanism includes a second worm wheel and a second worm, wherein the second worm wheel is fixedly connected to the second shaft section of the second shaft bevel gear, and the second worm is connected to the second drive device and meshes with the second worm wheel.

7. The dual-redundancy electric valve actuator according to claim 6, characterized in that: The valve stem is provided with a sensing rod; The dual-redundancy electric valve actuator also includes a photoelectric switch and a mounting plate. The mounting plate is located in the reduction gear box and is fixedly connected thereto. The photoelectric switch is mounted on the mounting plate and is used to sense the position of the sensing rod.

8. The dual-redundancy electric valve actuator according to claim 7, characterized in that: There are multiple photoelectric switches, and the multiple photoelectric switches are arranged in a circle with the axis of the valve stem as the center line.

9. The dual-redundancy electric valve actuator according to claim 1, characterized in that: Also included are a seventh bearing and an eighth bearing; The first support seat comprises a first arc plate and a first support plate, the first arc plate is coaxial with and connected to the third bevel gear with shaft, the first support plate is tangent to the first arc plate, a first mounting hole is provided on the first support plate, the seventh bearing is embedded in the first mounting hole, and the fifth shaft segment of the fifth bevel gear with shaft is installed in the seventh bearing; The second support seat includes a second arc plate and a second support plate, the second arc plate is coaxial with the third bevel gear with a shaft and connected thereto, the second support plate is tangent to the second arc plate, a second mounting hole is provided on the second support plate, the eighth bearing is embedded in the second mounting hole, and the sixth shaft segment of the sixth bevel gear with a shaft is installed in the eighth bearing.

10. The dual-redundancy electric valve actuator according to any one of claims 1 to 9, characterized in that: It also includes a motor cover, which is connected to the reduction gear box body and is arranged outside the first driving device and the second driving device.

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