An electric linear stroke valve actuator

Abstract

The present invention relates to the field of valve technology, and in particular to an electric straight-stroke valve actuator, comprising a housing, a motor, a screw, a moving ring and a ball bearing, wherein the motor is arranged at the upper part of the housing, the screw is coaxially connected to the output shaft of the motor, the moving ring is sleeved in the housing, a transmission groove is provided on the inner peripheral wall of the moving ring, the transmission groove is connected at both ends, the transmission groove comprises a spiral groove part and a connecting groove part, and the cross-sectional size of the spiral groove part is adapted to the cross-sectional size of the thread groove of the screw. The present invention is provided with a ball bearing and a spiral spring bar, and compared with a gear reduction mechanism such as a worm gear, when the screw in the present invention is powered, there will be no relative shaking between the screw and the moving ring, so there will be no return error, thereby ensuring that the force acting when the valve plate of the valve is closed can be accurately controlled to avoid the problem of excessive or insufficient pressure between the valve plate of the valve and the valve cavity.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and particularly to an electric linear stroke valve actuator. Background Art

[0002] Valves are mainly divided into two types according to their stroke types, namely linear stroke valves and angular stroke valves. Common linear stroke valves include globe valves, gate valves, and diaphragm valves, and their principles are all to control the fluid flow by moving the valve core or closing member in a straight line. In the prior art, an electric motor is mostly used as the power source, and the rotation of the motor is converted into the linear motion of the valve stem through a speed reduction mechanism (such as a worm and worm gear). However, when using a gear speed reduction mechanism such as a worm and worm gear for transmission (taking the worm and worm gear transmission as an example), in order to ensure the smooth rotation of the worm and worm gear, a certain backlash (i.e., tooth side clearance) is usually left in the design. As a result, a certain degree of return error will occur, which is manifested as obvious shaking in some working conditions, making it difficult to accurately control the acting force when the valve plate of the valve closes. Summary of the Invention

[0003] Based on this, it is necessary to provide an electric linear stroke valve actuator for solving the problem that it is difficult to accurately control the acting force when the valve plate of the valve closes, aiming at the problems existing in the current electric linear stroke valve actuator.

[0004] The above object is achieved by the following technical solutions:

[0005] An electric linear stroke valve actuator includes:

[0006] A housing;

[0007] An electric motor, which is arranged on the upper part of the housing;

[0008] A screw rod, which is coaxially connected to the output shaft of the electric motor;

[0009] A moving ring, which is sleeved inside the housing and can move along its own axis. A transmission groove is provided on the inner peripheral wall of the moving ring, and the head and tail of the transmission groove are connected. The transmission groove includes a spiral groove part and a connecting groove part, and the cross-sectional dimension of the spiral groove part is adapted to the cross-sectional dimension of the thread groove of the screw rod;

[0010] A plurality of balls, and the plurality of balls can be closely arranged along the transmission groove, and the balls rolling into the spiral groove part are engaged with the thread groove of the screw rod;

[0011] A spiral spring strip, which is arranged inside the spiral groove part and is configured to push the balls rolling into the spiral groove part to closely adhere to the thread groove of the screw rod;

[0012] The drive sleeve is coaxially and fixedly connected to the moving ring, and one end of the drive sleeve away from the moving ring is connected to the valve stem of the valve.

[0013] Preferably, the cross-sectional shape of the helical groove portion is the same as the cross-sectional shape of the thread groove of the screw, and both are V-shaped.

[0014] Preferably, an installation cavity is provided inside the moving ring. The installation cavity is communicated with the communicating groove portion. An electromagnetic component is provided in the installation cavity, and the magnetism of the electromagnetic component can be changed. A pressure sensor is provided in the valve, and the pressure sensor is electrically connected to the electromagnetic component;

[0015] The ball has magnetism;

[0016] The electromagnetic component is configured to start when the pressure value monitored by the pressure sensor is greater than a preset value, and the magnetism of the electromagnetic component changes once every preset time period;

[0017] When the magnetism of the electromagnetic component is opposite to the magnetism of the ball, under the magnetic attraction of the electromagnetic component, the ball moves from the communicating groove portion into the installation cavity;

[0018] When the magnetism of the electromagnetic component is the same as the magnetism of the ball, under the magnetic action of the electromagnetic component, the ball moves back from the installation cavity into the communicating groove portion.

[0019] Preferably, the electromagnetic component includes an electromagnet and elastic members. There are two elastic members. The two elastic members are arranged in the installation cavity at intervals. One ends of the two elastic members away from the installation cavity are fixedly connected to the electromagnet, and the elastic members are used to prevent the electromagnet from moving along the length direction of the installation cavity.

[0020] Preferably, guide blocks are provided at both connection positions of the helical groove portion and the communicating groove portion, and the guide blocks are used to guide the movement of the ball.

[0021] Preferably, the moving ring and the drive sleeve are coaxially and fixedly connected through a threaded fit.

[0022] Preferably, a connection end is threadedly connected to one end of the drive sleeve away from the moving ring, and the connection between one end of the drive sleeve away from the moving ring and the valve stem of the valve is made through the connection end.

[0023] Preferably, a support ring is provided at one end of the screw away from the motor, and the outer diameter of the support ring is adapted to the inner diameter of the drive sleeve.

[0024] Preferably, a connection hole is provided in the lower part of the housing, and the diameter of the connection hole is adapted to the diameter of the valve stem of the valve.

[0025] Preferably, a plurality of threaded holes are equidistantly arranged in the circumferential direction of the lower part of the housing and located at the connection holes, and the threaded holes correspond to the threaded holes on the flange surface of the valve one by one and are connected by bolts.

[0026] The beneficial effects of the present invention are as follows:

[0027] The present invention is provided with balls and spiral elastic bars. Compared with gear reduction mechanisms such as worm gears and worm wheels, when power is input to the screw rod in the present invention, there will be no relative shaking between the screw rod and the moving ring, so there will be no return error, thus ensuring that the acting force when the valve plate of the valve is closed can be accurately controlled to avoid the problem of excessive or too small pressure between the valve plate and the valve cavity of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is an overall schematic diagram of an electric linear stroke valve actuator of the present invention;

[0029] Figure 2 is a side view of an electric linear stroke valve actuator of the present invention;

[0030] Figure 3 is Figure 2 the A-A cross-sectional view in

[0031] Figure 4 is Figure 3 a schematic diagram of the enlarged structure at B in

[0032] Figure 5 is an exploded view of an electric linear stroke valve actuator of the present invention;

[0033] Figure 6 is a schematic diagram of the structure of the moving ring in an electric linear stroke valve actuator of the present invention;

[0034] Figure 7 is Figure 6 the C-C cross-sectional view in

[0035] Figure 8 is a schematic diagram of the structure of the screw rod in an electric linear stroke valve actuator of the present invention;

[0036] Figure 9 is Figure 8 a schematic diagram of the enlarged structure at D in

[0037] Wherein:

[0038] 100, housing; 110, connection hole; 120, threaded hole;

[0039] 200, motor;

[0040] 300, screw rod; 310, support ring;

[0041] 400, movable ring; 410, transmission groove; 411, spiral groove portion; 412, communication groove portion; 420, installation cavity; 430, guide block; 440, limit block;

[0042] 500, ball;

[0043] 600, spiral spring strip;

[0044] 700, transmission sleeve; 710, connecting end;

[0045] 800, electromagnetic assembly; 810, electromagnet; 820, elastic member. Specific embodiments

[0046] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0047] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The terms "connection" and "coupling" used in the present invention, unless otherwise clearly defined and limited, both include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0048] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0049] Such as Figures 1 to 9As shown in the figure, an electric linear stroke valve actuator includes a housing 100, a motor 200, a screw 300, a moving ring 400 and a plurality of balls 500. The motor 200 is arranged at the upper part of the housing 100. The screw 300 is coaxially connected to the output shaft of the motor 200. The moving ring 400 is sleeved inside the housing 100. Specifically, the moving ring 400 can move relative to the housing 100 along its own axis. A transmission groove 410 is formed on the inner peripheral wall of the moving ring 400. The two ends of the transmission groove 410 are communicated with each other. The transmission groove 410 includes a spiral groove portion 411 and a communication groove portion 412. The cross-sectional dimension of the spiral groove portion 411 is adapted to the cross-sectional dimension of the thread groove of the screw 300, and the spiral groove portion 411 spirally extends along the axis of the moving ring 400. The communication groove portion 412 communicates the two ends of the spiral groove portion 411. There are a plurality of balls 500. The plurality of balls 500 can be closely arranged along the transmission groove 410, and the balls 500 rolling into the spiral groove portion 411 are engaged with the thread groove of the screw 300. A spiral spring strip 600 is arranged in the spiral groove portion 411. The spiral spring strip 600 is configured to push the balls 500 rolling into the spiral groove portion 411 to closely adhere to the thread groove of the screw 300. A transmission sleeve 700 is coaxially and fixedly connected to the moving ring 400. One end of the transmission sleeve 700 away from the moving ring 400 is connected to the valve stem of the valve. One end of the valve stem away from the transmission sleeve 700 is fixedly connected to the valve plate of the valve.

[0050] When closing the valve, the staff controls the motor 200 to start, and the output shaft of the motor 200 drives the screw 300 to rotate circumferentially. Since the ball 500 is simultaneously engaged with the thread groove of the screw 300 and the spiral groove portion 411 of the moving ring 400 at this time, the torque output by the screw 300 is transmitted to the moving ring 400, causing the moving ring 400 to move downward along its own axis under force. During this process, the ball 500 circulates and rolls in the transmission groove 410. Since the spiral spring strip 600 is provided in the spiral groove portion 411 and is configured to push the ball 500 rolling into the spiral groove portion 411 to closely adhere to the thread groove of the screw 300, there is a large positive pressure between the screw 300 and the ball 500 at this time. When the screw 300 rotates, the ball 500 will not shake in the thread groove of the screw 300. Similarly, there is also a large positive pressure between the spiral spring strip 600 and the ball 500. Therefore, when the screw 300 rotates, the ball 500 will not shake relative to the spiral spring strip 600. And since the spiral spring strip 600 is provided in the spiral groove portion 411, the power of the rotation of the screw 300 can be accurately transmitted to the moving ring 400 through the ball 500. Compared with gear reduction mechanisms such as worm gears, when power is input to the screw 300 in the present invention, there will be no relative shaking between the screw 300 and the moving ring 400. Thus, there will be no return error, so that the acting force when the valve plate of the valve closes can be accurately controlled to avoid problems such as excessive or too small pressure between the valve plate and the valve cavity of the valve. When opening the valve, similarly, the staff only needs to control the motor 200 to start (rotate in the reverse direction), and the specific process will not be elaborated here.

[0051] It can be understood that, compared with the traditional transmission form of sliding friction between the screw and the slider, the transmission form of rolling friction of the ball 500 adopted in the present invention has a higher energy conversion efficiency and less wear is generated at the mating position between the screw 300 and the moving ring 400 during the transmission process. Therefore, the service life of this electric linear stroke valve actuator can be extended.

[0052] It should also be supplemented that a limiting block 440 is provided on the outer peripheral wall of the moving ring 400, and a limiting groove is provided on the inner peripheral wall of the housing 100. The limiting hole extends along the axis of the moving ring 400, and the limiting block 440 is slidably connected in the limiting groove.

[0053] In this embodiment, as Figure 7 and Figure 8 shown, the cross-sectional shape of the spiral groove portion 411 is the same as the cross-sectional shape of the thread groove of the screw 300, and both are V-shaped.

[0054] The cross-sectional shape of the thread groove of the existing screw 300 is mostly hemispherical, while the cross-sectional shapes of the screw 300 and the thread groove of the transmission groove 410 in the present invention are both V-shaped. Therefore, the degree of freedom limitation of the ball 500 can be improved, so that when power is transmitted between the screw 300 and the moving ring 400, the ball 500 is not likely to shake relative to the screw 300 and the moving ring 400. As the working time increases, the ball diameter of the ball 500 gradually decreases due to wear. If the thread groove of the screw 300 is a hemispherical groove, there will be a moving gap between the ball 500 and the thread groove of the screw 300, which will cause relative shaking between the screw 300 and the moving ring 400 during power transmission. In the present invention, by making the cross-sectional shapes of the spiral groove portion 411 and the thread groove of the screw 300 both V-shaped, and arranging a spiral spring strip 600 in the spiral groove portion 411, the ball 500 can still be kept in close contact with the thread groove of the screw 300 under the pushing action of the spiral spring strip 600, thereby further extending the service life of the electric linear stroke valve actuator disclosed in the present invention.

[0055] During the closing process of the valve, as the valve plate gradually moves downward, the flow-through area of the valve gradually decreases, and the pressure of the fluid on the valve plate continuously increases. Thus, it is easy to cause deformation of the valve plate of the valve. To solve this problem, as Figure 7 shown, in this embodiment, an installation cavity 420 is formed inside the moving ring 400. The installation cavity 420 is communicated with the communication groove portion 412. An electromagnetic component 800 is arranged in the installation cavity 420. The magnetism of the electromagnetic component 800 can be changed. A pressure sensor is arranged inside the valve. Specifically, the pressure sensor is arranged on the side of the valve plate facing the fluid. The pressure sensor is electrically connected to the electromagnetic component 800. The ball 500 has magnetism. When the pressure value monitored by the pressure sensor is greater than the preset value, the electromagnetic component 800 is started, and the magnetism of the electromagnetic component 800 changes once every preset time period. When the magnetism of the electromagnetic component 800 is opposite to that of the ball 500, under the magnetic attraction of the electromagnetic component 800, the ball 500 moves from the communication groove portion 412 into the installation cavity 420. When the magnetism of the electromagnetic component 800 is the same as that of the ball 500, under the magnetic action of the electromagnetic component 800, the ball 500 moves back from the installation cavity 420 into the communication groove portion 412.

[0056] When the pressure of the fluid on the valve plate reaches the preset value, the electromagnetic assembly 800 is activated, and the magnetism of the electromagnetic assembly 800 changes every preset time interval. Specifically, when the magnetism of the electromagnetic assembly 800 when it is energized is opposite to the magnetism of the ball 500, under the action of magnetic attraction, part of the balls 500 located in the communication groove portion 412 move from the communication groove portion 412 into the installation cavity 420. At this time, the balls 500 in the communication groove portion 412 cannot be closely arranged in the transmission groove 410 due to the decrease in the number, so the pre-tightening force of the spiral spring strip 600 on the balls 500 cannot be evenly distributed on all the balls 500 in the transmission groove 410, resulting in some of the balls 500 in the transmission groove 410 bearing too much pressure, while the other balls 500 in the transmission groove 410 are in a relaxed state. This unbalanced distribution of the pre-tightening force causes a jamming phenomenon (i.e., instantaneous pause) when power is transmitted between the screw 300 and the moving ring 400. At this time, the valve plate no longer continues to move downward. After a preset time interval, the current input direction of the electromagnetic assembly 800 is changed so that the magnetism of the electromagnetic assembly 800 changes to the same as the magnetism of the ball 500. At this time, under the action of magnetic repulsion, the balls 500 move from the installation cavity 420 into the communication groove portion 412 again. At this time, the balls 500 in the communication groove portion 412 are closely arranged again due to the increase in the number. At this time, the jamming phenomenon during the power transmission between the screw 300 and the moving ring 400 disappears. Under the driving action of the screw 300, the valve plate of the valve continues to move downward. Since the magnetism of the electromagnetic assembly 800 changes every preset time interval, the valve plate pauses intermittently during the process of moving downward to close the valve. In this way, it is equivalent to the fluid intermittently pressurizing the valve plate. When the valve plate stops moving downward, the valve plate has a certain time to relieve local stress concentration through microstructure adjustment to slow down its deformation degree under the action of force. In addition, by making the valve plate move downward intermittently, the valve plate has the opportunity to release part of the strain energy and reduce the amount of cumulative damage, thereby extending the service life of the valve plate.

[0057] In this embodiment, as Figure 7 shown, the electromagnetic assembly 800 includes an electromagnet 810 and an elastic member 820. There are two elastic members 820, and the two elastic members 820 are arranged in the installation cavity 420 at intervals. One end of the two elastic members 820 away from the installation cavity 420 is fixedly connected to the electromagnet 810. The elastic member 820 is used to prevent the electromagnet 810 from moving along the length direction of the installation cavity 420.

[0058] After the electromagnet 810 is energized, the electromagnet 810 generates magnetism. When the magnetism generated by the electromagnet 810 at this time is opposite to the magnetism of the ball 500, under the action of magnetic attraction, the ball 500 moves from the communication groove portion 412 into the installation cavity 420 and is adsorbed on the electromagnet 810.

[0059] When the direction of the current when the electromagnet 810 is energized changes, the magnetism generated by the electromagnet 810 is the same as that of the ball 500. Under the action of magnetic repulsion, the electromagnet 810 pushes the ball 500 from the installation cavity 420 into the communication groove portion 412, and makes the balls 500 closely arranged in the communication groove portion 412.

[0060] It can be understood that connecting the electromagnet 810 through two elastic members 820 is to enable the electromagnet 810 to move a certain distance along the length direction of the installation cavity 420, so as to smoothly press the balls 500 in the installation cavity 420 into the communication groove portion 412.

[0061] In this embodiment, as Figure 7 and Figure 9 shown, guide blocks 430 are provided at both connection positions of the spiral groove portion 411 and the communication groove portion 412. The guide blocks 430 are used to guide the movement of the balls 500, so that the balls 500 can smoothly circulate between the spiral groove portion 411 and the communication groove portion 412.

[0062] In this embodiment, as Figure 3 and Figure 7 shown, the moving ring 400 and the transmission sleeve 700 are coaxially fixedly connected through screw threads. Specifically, a threaded groove is formed at one end of the moving ring 400, and a threaded portion is provided on the outer peripheral surface of one end of the transmission sleeve 700. The threaded portion is matched with the threaded groove.

[0063] During installation, the staff only needs to rotate the transmission sleeve 700 and thread the end of the transmission sleeve 700 with the threaded portion into the threaded groove of the moving ring 400. Conversely, during disassembly, the staff only needs to rotate the transmission sleeve 700 in the reverse direction.

[0064] In this embodiment, as Figure 3 shown, a connection end 710 is threadedly connected to the end of the transmission sleeve 700 away from the moving ring 400. The end of the transmission sleeve 700 away from the moving ring 400 is connected to the valve stem of the valve through the connection end 710. Specifically, a threaded portion is provided on the outer periphery of the connection end 710, and a threaded hole is provided in the center of the valve stem. The threaded portion of the connection end 710 is threadedly connected to the threaded hole in the center of the valve stem.

[0065] It can be understood that during the process of the drive sleeve 700 driving the valve stem to move, the threaded portion of the connecting end 710 and the threaded hole in the center of the valve stem are the main stress points, so they are more likely to be crushed and damaged. By connecting the end of the drive sleeve 700 away from the moving ring 400 to the valve stem of the valve through the connecting end 710, it is possible to replace only the connecting end 710 in the case of damage to the connecting end 710, rather than replacing the entire drive sleeve 700, thus saving maintenance costs.

[0066] In this embodiment, as Figure 3 and Figure 4 shown, a support ring 310 is provided at one end of the screw 300 away from the motor 200, and the outer diameter of the support ring 310 is adapted to the inner diameter of the drive sleeve 700.

[0067] The support ring 310 is provided to support the end of the screw 300 and prevent the end of the screw 300 from bending due to the cantilever effect.

[0068] In this embodiment, as Figure 1 shown, a connection hole 110 is provided in the lower part of the housing 100, and the diameter of the connection hole 110 is adapted to the diameter of the valve stem of the valve.

[0069] The connection hole 110 is provided to facilitate the valve stem to pass through the connection hole 110 and be connected to the connection end 710.

[0070] In this embodiment, as Figure 1 shown, a plurality of threaded holes 120 are equidistantly provided in the circumferential direction of the lower part of the housing 100 and located at the connection hole 110. The threaded holes 120 correspond to the threaded holes 120 on the flange surface of the valve one by one and are connected by bolts, so as to fixedly connect the housing 100 to the flange plane of the valve through the threaded holes 120.

[0071] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0072] The above-described embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An electric linear valve actuator, characterized in that: include: shell; A motor, which is arranged at the upper part of the housing; A screw rod, wherein the screw rod is coaxially connected to an output shaft of the motor; A moving ring is sleeved in the outer shell and can move along its own axis. A transmission groove is provided on the inner circumferential wall of the moving ring. The transmission groove is connected at both ends. The transmission groove includes a spiral groove part and a connecting groove part. The cross-sectional size of the spiral groove part is adapted to the cross-sectional size of the thread groove of the screw. Balls, there are multiple balls, and the multiple balls can be closely arranged along the transmission groove, and the balls rolling into the spiral groove part cooperate with the thread groove of the screw; A spiral spring bar, the spiral spring bar is arranged in the spiral groove part, and the spiral spring bar is configured to push the ball rolling into the spiral groove part to cling to the thread groove of the screw; A transmission sleeve, the transmission sleeve is coaxially fixedly connected with the moving ring, one end of the transmission sleeve away from the moving ring is connected to the valve stem of the valve, the cross-sectional shape of the spiral groove part is the same as the cross-sectional shape of the thread groove of the screw, and both are V-shaped, an installation cavity is opened inside the moving ring, the installation cavity is connected with the connecting groove part, an electromagnetic component is arranged in the installation cavity, the magnetism of the electromagnetic component can be changed, a pressure sensor is arranged in the valve, and the pressure sensor is electrically connected to the electromagnetic component; The ball is magnetic; The electromagnetic component is configured so that when the pressure value detected by the pressure sensor is greater than a preset value, the electromagnetic component is activated, and the magnetism of the electromagnetic component changes once every preset time period; When the magnetism of the electromagnetic component is opposite to that of the ball, the ball moves from the connecting groove to the installation cavity under the magnetic attraction of the electromagnetic component; When the magnetism of the electromagnetic assembly is the same as that of the ball, the ball moves from the installation cavity back to the communicating groove portion under the magnetic effect of the electromagnetic assembly.

2. The electric linear valve actuator according to claim 1, characterized in that: The electromagnetic assembly includes an electromagnet and an elastic member. There are two elastic members, which are spaced apart in the installation cavity. One end of the two elastic members away from the installation cavity is fixedly connected to the electromagnet. The elastic member is used to prevent the electromagnet from moving along the length direction of the installation cavity.

3. The electric linear valve actuator according to claim 1, characterized in that: Guide blocks are provided at two connection positions of the spiral groove part and the connecting groove part, and the guide blocks are used to guide the movement of the balls.

4. The electric linear valve actuator according to claim 1, characterized in that: The movable ring and the transmission sleeve are matched through threads to achieve coaxial fixed connection.

5. The electric linear valve actuator according to claim 1, characterized in that: The end of the transmission sleeve away from the moving ring is threadedly connected with a connecting end, and the end of the transmission sleeve away from the moving ring is connected to the valve stem of the valve through the connecting end.

6. The electric linear valve actuator according to claim 1, characterized in that: A support ring is arranged at one end of the screw rod away from the motor, and the outer diameter of the support ring is matched with the inner diameter of the transmission sleeve.

7. The electric linear valve actuator according to claim 1, characterized in that: A connecting hole is provided at the lower part of the shell, and the diameter of the connecting hole is matched with the diameter of the valve stem of the valve.

8. The electric linear valve actuator according to claim 7, characterized in that: A plurality of threaded holes are provided at equal intervals in the lower part of the shell and circumferentially of the connecting hole. The threaded holes correspond to the threaded holes on the flange surface of the valve one by one and are connected by bolts.

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