A lightweight manual valve automatic control actuator

Abstract

The present invention discloses a lightweight manual valve automatic control actuator, which includes a support frame sleeved outside the valve lead screw seat and rotatably and limitedly connected to the valve body at the lower end; a limit mounting member fixedly connected to the support frame and rotatably and limitedly connected to the valve lead screw seat; a connecting member coaxially fixed to the top end of the valve lead screw; a permanent magnet rotor sleeved on the connecting member; an exciting stator coaxially sleeved outside the permanent magnet rotor and fixedly connected to the upper end of the support frame at the lower end; the height of the exciting stator is greater than the height of the permanent magnet rotor, and when the permanent magnet rotor drives the valve lead screw to rotate under the electromagnetic action, the permanent magnet rotor is always located inside the exciting stator; a hand wheel is arranged at the top end of the connecting member. Install the components onto the existing valve in the above-mentioned order, and control the opening and closing of the valve by controlling the rotation of the permanent magnet by controlling the input current and voltage. The present invention can realize the automatic control of the valve without affecting the natural gas transportation and without damaging the existing valve.

Description

Technical Field

[0001] The present invention relates to the field of valves, and particularly to a lightweight manual valve automatic control actuator. Background Art

[0002] Natural gas is usually transported by pipelines. In the pipeline transportation line, valves are used to control the transportation volume and path of natural gas. Most of the current valves on natural gas transportation pipelines are manual valves. As Figure 1 shown, the control of pipeline flow is achieved by manually rotating the handwheel of the valve.

[0003] In order to improve the monitoring and intelligence of natural gas pipeline transportation, valves need to achieve remote opening and closing control. Therefore, this can be achieved by replacing existing valves with intelligent valves or transforming existing valves. Replacing existing valves will cause the interruption of natural gas transportation, and at the same time, the cost of the replaced intelligent valves is relatively high. Therefore, it can only be transformed on the basis of existing valves to achieve intelligence, and currently, there is no intelligent transformation technology for natural gas transportation valves without affecting natural gas transportation and without damaging existing valves. Summary of the Invention

[0004] In view of the above-mentioned defects of the prior art, the purpose of the present invention is to provide a lightweight manual valve automatic control actuator, which can achieve automatic control of the valve without affecting natural gas transportation and without damaging existing valves.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A lightweight manual valve automatic control actuator includes:

[0007] A support frame, which is sleeved outside the valve screw seat and is rotatably and limit-connected to the valve body at the lower end;

[0008] A limit mounting member, which is fixedly connected to the support frame and is rotatably and limit-connected to the valve screw seat;

[0009] A connecting member, which is coaxially fixed at the top end of the valve screw;

[0010] A permanent magnet rotor, which is sleeved on the connecting member;

[0011] An exciting stator, which is coaxially sleeved outside the permanent magnet rotor and is fixedly connected to the upper end of the support frame at the lower end; the height of the exciting stator is greater than the height of the permanent magnet rotor, and when the permanent magnet rotor drives the valve screw to rotate under the electromagnetic action, the permanent magnet rotor is always located inside the exciting stator;

[0012] A handwheel, which is arranged at the top end of the connecting member.

[0013] Further, the support frame includes:

[0014] The bottom pipe is coaxially sleeved outside the valve screw rod seat and contacts the valve body at the lower end; two through holes are provided on the side wall of the bottom pipe, and the two through holes are mirror-symmetrically arranged with respect to the axis of the bottom pipe; the two through holes are aligned with two openings on the valve screw rod seat; the limit mounting member passes through the two through holes and the openings and is limit-connected to the valve screw rod seat;

[0015] The top pipe is coaxially fixed at the upper end of the bottom pipe; the inner diameter of the top pipe is equal to the inner diameter of the bottom pipe, and the outer diameter is larger than the outer diameter of the bottom pipe; the excitation stator is fixed to the top pipe.

[0016] Further, the limit mounting member is U-shaped, passes through the through hole and the opening on the valve screw rod seat, is fork-shaped on both sides of the valve screw rod, and is fixed to the bottom pipe.

[0017] Further, two connecting blocks for fixedly connecting with the outer cylindrical surface of the bottom pipe are provided on the lower surface of the top pipe; the two connecting blocks are located directly above the through holes, and threaded holes are provided on the lower surfaces of the two connecting blocks; screw holes are provided on the limit mounting member opposite to the threaded holes, and both ends of the limit mounting member are fixed to the two connecting blocks by screws.

[0018] Further, the bottom pipe includes:

[0019] The pipe part is circular tubular, is fixed to the top pipe, and two through holes are provided on the side wall;

[0020] The support part includes a number of struts arranged in a uniform circumferential array around the axis of the pipe part, and the struts point vertically downward to the valve body; the struts and the bolts on the valve body are arranged at intervals in turn; the outer surface of the strut contacts the side surface of the bolt.

[0021] Further, it further includes:

[0022] The bottom sealing disc, the lower disc surface is seamlessly sealed with the support frame, the upper disc surface is seamlessly sealed with the lower end surface of the excitation stator, and a circular hole is provided in the middle; the center of the circular hole is collinear with the axis of the screw rod;

[0023] The screw rod bearing is arranged inside the circular hole, and the outer ring of the screw rod bearing is seamlessly fixed to the inner wall of the circular hole; the inner wall of the inner ring of the screw rod bearing is provided with an internal thread matching the screw rod.

[0024] Further, it further includes:

[0025] The top sealing disc, the lower disc surface is seamlessly sealed with the upper end surface of the excitation stator, and a through hole is provided in the middle; the center of the through hole is collinear with the axis of the screw rod; the connecting member passes through the through hole;

[0026] The connecting bearing is internally arranged in the through hole, and the outer ring of the connecting bearing is seamlessly fixed to the inner wall of the through hole; the contour of the inner ring of the connecting bearing matches the outer contour of the connecting piece; the inner ring of the connecting bearing is slidably sealed with the outer surface of the connecting piece; when the screw rod descends to the lowest position, the connecting piece is sleeved inside the connecting bearing.

[0027] Furthermore, it further includes:

[0028] The closed shell is in the shape of a cylindrical barrel with an opening downward; an installation hole is provided at the center of the bottom of the closed shell; a sealing rubber ring is provided in the installation hole; the closed shell is buckled on the connecting piece through the installation hole; the upper end of the excitation stator is located inside the closed shell; an annular clamping groove is provided on the inner wall of the lower end of the closed shell;

[0029] The annular sealing strip is clamped in the annular clamping groove and abuts against the outer shell of the excitation stator.

[0030] Furthermore, the connecting piece is a hexagonal prism, and a groove matching the top end of the valve screw rod is provided at the lower end of the connecting piece; a screw hole communicating with the groove is provided on the hexagonal prism; the hexagonal prism is coaxially fixed on the valve screw rod through a screw; the permanent magnet rotor outer sleeve is fixed to the outer end of the hexagonal prism; the handwheel is installed at the top end of the hexagonal prism.

[0031] Furthermore, a clamping hexagonal prism is provided coaxially at the top of the connecting piece, the shape of the sealing rubber ring is a regular hexagon, and it is sleeved on the clamping hexagonal prism, and the installation hole on the closed shell is in interference fit with the sealing rubber ring;

[0032] A handwheel installation post is provided on the clamping hexagonal prism, a pressure pipe is sleeved on the handwheel installation post, and the outer diameter of the pressure pipe is not greater than the outer diameter of the connecting piece; the lower end of the pressure pipe abuts against the upper surface of the closed shell under the extrusion of the handwheel installation nut.

[0033] A usage method of a lightweight manual valve automatic control actuator includes the following steps:

[0034] S1. Remove the handwheel of the existing valve;

[0035] S2. Fix the connecting piece and the top end of the screw rod coaxially;

[0036] S3. Coaxially sleeve the support frame on the valve screw rod seat, and make the lower end of the support frame in horizontal contact with the valve body;

[0037] S4. Use the limit installation part to rotatably limit the connection between the support frame and the valve screw rod seat;

[0038] S5. Sleeve the permanent magnet rotor on the connecting piece;

[0039] S6. Sheath the exciting stator coaxially on the permanent magnet rotor and fixedly connect it to the support frame;

[0040] S7. Install the handwheel at the top of the connecting piece.

[0041] Due to the adoption of the above technical solutions, the present invention has the following advantages:

[0042] On the basis of the existing valve, a support frame is added to install the permanent magnet rotor component for driving the lead screw, without damaging the existing valve structure. The limit mounting piece rotationally limits the support frame and the valve lead screw seat. When power is supplied to the exciting stator, it drives the permanent magnet rotor to rotate, and during the rotation of the permanent magnet rotor, it rises and falls with the lead screw, but it always remains in the exciting stator, thus achieving a better control effect. The installation of the handwheel can ensure that the valve can still be manually controlled to open and close when the automatic drive fails.

[0043] Other advantages, objectives and features of the present invention will be described to some extent in the subsequent description, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The drawings of the present invention are described as follows:

[0045] Figure 1 It is a schematic structural diagram of the existing natural gas pipeline valve.

[0046] Figure 2 It is a front view structural schematic diagram of the lightweight manual valve automatic control actuator in the embodiment.

[0047] Figure 3 It is for Figure 2 The enlarged structural schematic diagram at A in

[0048] Figure 4 It is a sectional view structural schematic diagram of the lightweight manual valve automatic control actuator in the embodiment.

[0049] Figure 5 It is for Figure 4 The enlarged structural schematic diagram at B in

[0050] Figure 6 It is for Figure 4 The enlarged structural schematic diagram at C in

[0051] Figure 7 It is for Figure 4 The enlarged structural schematic diagram at D in

[0052] Figure 8 It is for Figure 4 The enlarged structural schematic diagram at E in

[0053] Figure 9 is Figure 4 The schematic structural diagram at the F-F section in

[0054] Figure 10 is Figure 4 The schematic structural diagram at the G-G section in

[0055] Figure 11 is Figure 4 The schematic structural diagram at the H-H section in

[0056] Figure 12 is Figure 4 The schematic structural diagram at the J-J section in

[0057] Figure 13 is Figure 4 The schematic structural diagram at the K-K section in

[0058] In the figure: 111. Pipe part; 1111. Through hole; 112. Support rod; 12. Jacking pipe; 13. Connecting block; 2. Limit mounting part; 3. Connecting part; 31. Groove; 32. Clamping hexagonal prism; 33. Pressing pipe; 4. Permanent magnet rotor; 5. Excitation stator; 6. Handwheel; 7. Bottom sealing plate; 71. Round hole; 8. Lead screw bearing; 9. Top sealing plate; 91. Through hole; 100. Connecting bearing; 101. Enclosure; 1011. Annular clamping groove; 102. Sealing rubber ring; 103. Annular sealing strip; 200. Valve body; 201. Valve lead screw seat; 202. Valve lead screw; 203. Opening. Specific embodiments

[0059] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. Embodiment

[0060] As Figures 2 to 13 shown, a lightweight manual valve automatic control actuator includes:

[0061] A support frame, which is sleeved outside the valve lead screw seat 201, and the lower end is rotationally and limit-connected to the valve body 200;

[0062] A limit mounting part 2, which is fixedly connected to the support frame and rotationally and limit-connected to the valve lead screw seat 201;

[0063] A connecting part 3, which is coaxially fixed at the top end of the valve lead screw 202;

[0064] A permanent magnet rotor 4, which is sleeved on the connecting part 3;

[0065] The exciting stator 5 is coaxially sleeved outside the permanent magnet rotor 4 and is fixedly connected to the upper end of the support frame at the lower end; the height of the exciting stator 5 is greater than the height of the permanent magnet rotor 4, and when the permanent magnet rotor 4 drives the valve lead screw 202 to rotate under the electromagnetic action, the permanent magnet rotor 4 is always located within the exciting stator 5;

[0066] The handwheel 6 is arranged at the top end of the connecting piece 3.

[0067] On the basis of the existing valve, a support frame is added to install the permanent magnet rotor 4 component for driving the lead screw without damaging the existing valve structure. The limit mounting member 2 rotationally limits the support frame and the valve lead screw seat 201. When power is supplied to the exciting stator 5, the permanent magnet rotor 4 is driven to rotate, and during the rotation of the permanent magnet rotor 4, it rises and falls with the lead screw, but it always remains within the exciting stator 5, thereby achieving a better control effect. The installation of the handwheel 6 can ensure that the valve can still be manually controlled to open and close when the automatic drive fails.

[0068] In this embodiment, the support frame includes:

[0069] The bottom pipe is coaxially sleeved outside the valve lead screw seat 201 and contacts the valve body 200 at the lower end; two through holes 1111 are provided on the side wall of the bottom pipe, and the two through holes 1111 are mirror-symmetrically arranged with respect to the axis of the bottom pipe; the two through holes are aligned with two openings 203 on the valve lead screw seat 201; the limit mounting member 2 passes through the two through holes 1111 and the openings 203 and is in limit connection with the valve lead screw seat 201;

[0070] The top pipe 12 is coaxially fixedly connected to the upper end of the bottom pipe; the inner diameter of the top pipe 12 is equal to the inner diameter of the bottom pipe, and the outer diameter is greater than the outer diameter of the bottom pipe; the exciting stator 5 is fixedly connected to the top pipe 12.

[0071] The rotation of the bottom pipe can be restricted through the cooperation of the through holes 1111 and the limit mounting member 2. Specifically, the limit mounting member 2 also passes through the openings 203 on the valve lead screw seat 201, so that the bottom pipe is fixed relative to the valve lead screw seat 201. Therefore, the rotation of the top pipe 12 installed on the bottom pipe and the exciting stator 5 installed on the top pipe 12 is restricted.

[0072] In this embodiment, the limit mounting member 2 is U-shaped, passes through the through holes 1111 and the openings 203 on the valve lead screw seat 201, is fork-shaped on both sides of the valve lead screw 202, and is fixedly connected to the bottom pipe.

[0073] The U-shaped structure facilitates installation and disassembly and does not have any impact on the rotation of the lead screw.

[0074] In this embodiment, two connecting blocks 13 fixedly connected to the outer cylindrical surface of the bottom pipe are provided on the lower surface of the jacking pipe 12; the two connecting blocks 13 are located directly above the through holes 1111, and threaded holes are provided on the lower surfaces of the two connecting blocks 13; screw holes facing the threaded holes are provided on the limiting mounting member 2, and both ends of the limiting mounting member 2 are fixed to the two connecting blocks 13 by screws.

[0075] The connecting blocks 13 can reduce the height of the jacking pipe 12, reduce the weight, and at the same time reduce the material cost.

[0076] In this embodiment, the bottom pipe includes:

[0077] A pipe portion 111, which is circular tubular and fixedly connected to the jacking pipe 12, and two through holes 1111 are provided on the side wall;

[0078] A support portion, including a plurality of support rods 112 arranged in a uniform circumferential array around the axis of the pipe portion 111, and the support rods 112 vertically point downward to the valve body 200; the support rods 112 and the bolts on the valve body 200 are arranged at intervals in turn; the outer surface of the support rod 112 contacts the side surface of the bolt.

[0079] The form of the support rod 112 contacts the valve body 200, which can make the contact surface between the bottom pipe and the valve body 200 as stable as possible, and the support rod 112 abuts against the bolt, which can improve the limit of the support rod 112, and further improve the stability of the bottom pipe during operation.

[0080] In this embodiment, it further includes:

[0081] A bottom sealing plate 7, the lower disk surface of which is seamlessly sealed with the support frame, the upper disk surface of which is seamlessly sealed with the lower end surface of the exciting stator 5, and a circular hole 71 is provided in the middle; the center of the circular hole 71 is collinear with the axis of the lead screw;

[0082] A lead screw bearing 8 is arranged inside the circular hole 71, and the outer ring of the lead screw bearing 8 is seamlessly fixed to the inner wall of the circular hole 71; an internal thread matching the lead screw is provided on the inner wall of the inner ring of the lead screw bearing 8.

[0083] The bottom sealing plate 7 and the lead screw bearing 8 can seal the lower end of the exciting stator 5, reducing the entry of external impurities into it and affecting the rotation of the permanent magnet rotor 4. At the same time, the inner ring of the lead screw bearing 8 is provided with the same thread as the lead screw, which is convenient for installation and disassembly.

[0084] In this embodiment, it further includes:

[0085] A top sealing plate 9, the lower disk surface of which is seamlessly sealed with the upper end surface of the exciting stator 5, and a through hole 91 is provided in the middle; the center of the through hole 91 is collinear with the axis of the lead screw; the connecting member 3 passes through the through hole 91;

[0086] The connecting bearing 100 is internally provided in the through hole 91, and the outer ring of the connecting bearing 100 is seamlessly fixed to the inner wall of the through hole 91; the contour of the inner ring of the connecting bearing 100 matches the outer contour of the connecting member 3; the inner ring of the connecting bearing 100 is in sliding seal with the outer surface of the connecting member 3; when the lead screw descends to the lowest position, the connecting member 3 is sleeved inside the connecting bearing 100.

[0087] The top sealing plate 9 and the lead screw bearing 8 can seal the upper end of the exciting stator 5, reducing the entry of external impurities, rainwater, etc. into it and affecting the rotation of the permanent magnet rotor 4. The connecting bearing 100 can reduce the resistance when the lead screw rotates and can also limit the swing of the lead screw.

[0088] In this embodiment, the following can also be provided in this device:

[0089] The closed shell 101 is in the shape of a downward-opening cylinder; an installation hole is provided at the center of the bottom of the closed shell 101; a sealing rubber ring 102 is provided in the installation hole; the closed shell 101 is buckled on the connecting member 3 through the installation hole; the upper end of the exciting stator 5 is located inside the closed shell 101; an annular clamping groove 1011 is provided on the inner wall of the lower end of the closed shell 101;

[0090] The annular sealing strip 103 is clamped in the annular groove and abuts against the outer shell of the exciting stator 5.

[0091] When the top sealing plate 9 and the connecting bearing 100 are not provided in order to improve the heat dissipation effect or save costs, the closed shell 101 can be provided, or the closed shell 101 can also be provided at a valve with a relatively high safety level while the top sealing plate 9 and the connecting bearing 100 are already provided, so as to ensure that when there is a sealing problem with the connecting bearing 100, external rainwater and impurities will not easily enter the exciting stator 5.

[0092] The closed shell 101 can shield the top of the exciting stator 5, and at the same time can increase the heat dissipation space and improve the heat dissipation effect.

[0093] The annular sealing strip 103 can seal the direct connection between the inside of the exciting stator 5 and the outside world, and at the same time its friction with the exciting outer shell is small, not affecting the normal rotation of the lead screw.

[0094] In this embodiment, the connecting member 3 is a hexagonal prism, and a groove 31 matching the top end of the valve lead screw 202 is provided at the lower end of the connecting member 3; a screw hole communicating with the groove 31 is provided on the hexagonal prism; the hexagonal prism is coaxially fixed on the valve lead screw 202 by screws; the permanent magnet rotor 4 is fixedly sleeved on the outer end of the hexagonal prism; the handwheel 6 is installed at the top of the hexagonal prism.

[0095] In this embodiment, a coaxial clamping hexagonal prism 32 is provided at the top of the connecting member 3. The sealing rubber ring 102 is in the shape of a regular hexagon and is sleeved on the clamping hexagonal prism 32. The mounting hole on the closed shell 101 is in interference fit with the sealing rubber ring 102.

[0096] The height of the closed shell 101 can be restricted by the clamping hexagonal prism 32 to prevent it from rotating and rubbing against the excitation stator 5. The regular hexagonal sealing rubber ring 102 and the regular hexagonal mounting hole on the enclosure can achieve good clamping and fixing, thereby obtaining better stability and sealing performance.

[0097] A handwheel 6 mounting post is provided on the clamping hexagonal prism 32. A pressure tube 33 is sleeved on the handwheel 6 mounting post, and the outer diameter of the pressure tube 33 is not greater than the outer diameter of the connecting member 3. The lower end of the pressure tube 33 abuts against the upper surface of the closed shell 101 under the extrusion of the handwheel 6 mounting nut.

[0098] The lower part of the handwheel 6 mounting post is a regular polygon, corresponding to the mounting hole of the handwheel 6 to achieve clamping. The pressure tube 33 can realize downward extrusion and limitation of the closed shell 101, so that the mounting hole of the closed shell 101 and the sealing rubber ring 102 will not tilt and cause sealing failure.

[0099] The lightweight manual valve automatic control actuator of this embodiment is installed and used as follows:

[0100] First, remove the handwheel 6 of the valve and install the connecting member 3 at the top of the screw rod. A support frame is sleeved on the valve screw rod seat 201, and the support rod 112 at the bottom of the support frame is located between the valve bolts. The limit mounting member 2 is fixed to the support frame through the through hole 1111 and the opening 203, and the permanent magnet rotor 4 is fixedly connected to the connecting rod.

[0101] After installing the closing disk at the lower end of the excitation stator 5, then fix the excitation stator 5 to the support frame; then install the capping disk on the top of the excitation stator 5.

[0102] Finally, the outer sleeve of the closed shell 101 is sleeved on the clamping hexagonal prism 32 through the sealing rubber ring 102, and then the pressure tube 33 and the handwheel 6 are installed.

[0103] After connecting the excitation stator 5 to the controller, by supplying power to the excitation stator 5, the magnetic field change of the coil in the excitation stator 5 is controlled, so that the rotation of the permanent magnet rotor 4 can be controlled. The permanent magnet rotor 4 drives the connecting rod to rotate, and the connecting rod drives the screw rod to rotate, thereby opening and closing the valve.

[0104] When the permanent magnet rotor 4 rotates, the excitation stator 5 receives a reverse torque, which is transmitted to the valve screw rod seat 201 through the limit mounting member 2, and at the same time, part of the torque can also be transmitted to the valve bolt through the support rod 112.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A lightweight manual valve automatic control actuator, characterized in that Comprising: A support frame, sleeved outside the valve screw rod seat, and the lower end is rotationally and limit-connected to the valve body; A limit mounting member, fixedly connected to the support frame and rotationally and limit-connected to the valve screw rod seat; A connecting member, coaxially fixed at the top end of the valve screw rod; A permanent magnet rotor, sleeved on the connecting member; An exciting stator, coaxially sleeved outside the permanent magnet rotor, and the lower end is fixedly connected to the upper end of the support frame; the height of the exciting stator is greater than the height of the permanent magnet rotor, and when the permanent magnet rotor drives the valve screw rod to rotate under electromagnetic action, the permanent magnet rotor is always located inside the exciting stator; A handwheel, arranged at the top end of the connecting member; A bottom sealing plate, the lower disk surface is seamlessly sealed with the support frame, the upper disk surface is seamlessly sealed with the lower end surface of the exciting stator, and a circular hole is provided in the middle; the center of the circular hole is collinear with the axis of the screw rod; A screw rod bearing, arranged inside the circular hole, and the outer ring of the screw rod bearing is seamlessly fixedly connected to the inner wall of the circular hole; an internal thread matching the screw rod is provided on the inner wall of the inner ring of the screw rod bearing; A top sealing plate, the lower disk surface is seamlessly sealed with the upper end surface of the exciting stator, and a through hole is provided in the middle; the center of the through hole is collinear with the axis of the screw rod; the connecting member passes through the through hole; A connecting bearing, arranged inside the through hole, and the outer ring of the connecting bearing is seamlessly fixedly connected to the inner wall of the through hole; the contour of the inner ring of the connecting bearing matches the outer contour of the connecting member; the inner ring of the connecting bearing is slidably sealed with the outer surface of the connecting member; when the screw rod descends to the lowest position, the connecting member is sleeved inside the connecting bearing; The support frame includes: A bottom pipe, coaxially sleeved outside the valve screw rod seat, and the lower end contacts the valve body; two through holes are provided on the side wall of the bottom pipe, and the two through holes are mirror-symmetrically arranged with respect to the axis of the bottom pipe; the two through holes are opposite to two openings on the valve screw rod seat; the limit mounting member passes through the two through holes and the openings and is limit-connected to the valve screw rod seat; A top pipe, coaxially fixedly connected to the upper end of the bottom pipe; the inner diameter of the top pipe is equal to the inner diameter of the bottom pipe, and the outer diameter is greater than the outer diameter of the bottom pipe; the exciting stator is fixedly connected to the top pipe.

2. The lightweight manual valve automatic control actuator according to claim 1, characterized in that, The limit mounting member is U-shaped, passes through the through hole and the opening on the valve screw rod seat, is fork-shaped on both sides of the valve screw rod, and is fixedly connected to the bottom pipe.

3. The lightweight manual valve automatic control actuator according to claim 2, characterized in that, Two connecting blocks fixedly connected to the outer cylindrical surface of the bottom pipe are provided on the lower surface of the top pipe; the two connecting blocks are located directly above the through holes, and threaded holes are provided on the lower surfaces of the two connecting blocks; screw holes opposite to the threaded holes are provided on the limit mounting member, and the two ends of the limit mounting member are fixed to the two connecting blocks by screws.

4. The lightweight manual valve automatic control actuator according to claim 1, characterized in that, The bottom pipe includes: A pipe portion, in the shape of a circular tube, fixedly connected to the top pipe, and two through holes are provided on the side wall; A support portion, including a plurality of support rods arranged in a uniform circumferential array around the axis of the pipe portion, and the support rods vertically point downward to the valve body; the support rods and the bolts on the valve body are arranged at intervals in turn; the outer surface of the support rod contacts the side surface of the bolt.

5. The lightweight manual valve automatic control actuator according to any one of claims 1-4, characterized in that, Also included: A closed shell, in the shape of a circular barrel with an opening downward; an installation hole is provided at the center of the bottom of the closed shell; a sealing rubber ring is provided in the installation hole; the closed shell is buckled on the connecting member through the installation hole; the upper end of the exciting stator is located inside the closed shell; an annular clamping groove is provided on the inner wall of the lower end of the closed shell; The annular sealing strip is clamped in the annular groove and abuts against the outer shell of the exciting stator.

6. The lightweight manual valve automatic control actuator according to claim 5, wherein, The connecting piece is a hexagonal prism. A groove matching the top end of the valve lead screw is provided at the lower end of the connecting piece; a screw hole communicating with the groove is provided on the hexagonal prism; the hexagonal prism is coaxially fixed on the valve lead screw by screws; the permanent magnet rotor outer sleeve is fixed at the outer end of the hexagonal prism; the handwheel is installed at the top end of the hexagonal prism.

7. The lightweight manual valve automatic control actuator according to claim 6, characterized in that A clamping hexagonal prism is provided coaxially at the top of the connecting piece. The sealing rubber ring is in the shape of a regular hexagon and is sleeved on the clamping hexagonal prism. The mounting hole on the closed shell is in interference fit with the sealing rubber ring; A handwheel mounting post is provided on the clamping hexagonal prism. A pressure pipe is sleeved on the handwheel mounting post. The outer diameter of the pressure pipe is not greater than the outer diameter of the connecting piece; the lower end of the pressure pipe abuts against the upper surface of the closed shell under the extrusion of the handwheel mounting nut.

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