Electro-pneumatic valve positioner convenient to disassemble and overhaul

Abstract

The utility model relates to the field of valve positioners, in particular to an electro-pneumatic valve positioner convenient to disassemble and overhaul, which comprises a pneumatic valve body, a connecting flange is arranged at the top of the pneumatic valve body, the pneumatic valve body is provided with a pneumatic executing part in a communicated manner, and a valve positioner main body is arranged on the front surface of the pneumatic executing part; when the valve positioner body is installed, the clamping plate is clamped to the surface of the fixing block through sliding connection between the second handle and the guide rail, when the clamping plate slides to a certain position on the surface of the fixing block, the wedge-shaped clamping block automatically enters the clamping groove through elasticity of the abutting spring, and meanwhile the clamping plate is clamped into the clamping groove through the abutting spring. The wedge-shaped clamping block further extends into the clamping groove through threaded connection of the first screw rod and the sliding threaded sleeve, the connection stability of the fixing block and the clamping plate is enhanced, and when disassembly is needed, the wedge-shaped clamping block and the clamping groove can be separated by rotating the first handle reversely.

Description

Technical Field

[0001] The utility model relates to the field of valve positioners, and particularly to an electric valve positioner that is convenient for disassembly and maintenance. Background Art

[0002] An electric valve positioner is a main accessory of a pneumatic control valve, usually used in conjunction with a pneumatic control valve. The electric valve positioner is connected to an actuator, and the actuator is connected to the pneumatic control valve. The actuator drives the valve stem in the pneumatic control valve to move, thereby changing the opening degree. The electric valve positioner is linked with the actuator, and then converts the valve stem displacement of the pneumatic control valve into an electrical signal and feeds the electrical signal back to the controller. The controller compares the electrical signal with the set signal. When there is a deviation between the two, the controller changes its output signal to the actuator, causing the actuator to act, and then adjusting the opening degree of the pneumatic control valve to the set value;

[0003] After retrieval, for example, a valve positioner that is convenient for disassembly and assembly with the authorization announcement number: CN219140026U. This positioner uses two clamping plates to approach each other to facilitate the clamping and installation of the pneumatic actuator, thus realizing the advantage of convenient disassembly of the electric valve; however, this positioner has the following problems:

[0004] This positioner drives the movement of the clamping plate by means of screw adjustment. Since the pneumatic valve body is a fluid transmission and automatic control device, due to the limitations of its own structural form and control method, the pneumatic valve body is prone to regular vibration. Long-term vibration will cause the screw to move relatively, resulting in spontaneous retraction of the screw, and then easily loosening the clamping plate, leading to the detachment of the valve positioner.

[0005] Therefore, an electric valve positioner that is convenient for disassembly and maintenance is proposed to solve the above problems. Content of the Utility Model

[0006] The purpose of the present utility model is to provide an electric valve positioner that is convenient for disassembly and maintenance to solve the above problems, and improves the problem that long-term vibration will cause the screw to move relatively, resulting in spontaneous retraction of the screw, and then easily loosening the clamping plate, leading to the detachment of the valve positioner.

[0007] The present utility model realizes the above object through the following technical solutions. An electric valve positioner convenient for disassembly and maintenance includes: a pneumatic valve body, a connecting flange is arranged at the top of the pneumatic valve body, the pneumatic valve body is installed with a pneumatic actuator through communication, and a valve positioner main body is arranged on the front surface of the pneumatic actuator; a disassembly and assembly mechanism, the disassembly and assembly mechanism is installed between the pneumatic actuator and the valve positioner main body and can disassemble and assemble the valve positioner main body; among them. The disassembly and assembly mechanism includes a fixed block fixedly installed on the surface of the pneumatic actuator, a clamping plate is fixedly installed on one side of the valve positioner main body, clamping grooves are opened on both sides of the fixed block, a connecting piece is installed through the inside of the clamping plate, and the connecting piece is used for disassembling and assembling the valve positioner main body.

[0008] Preferably, the connecting piece includes two installation cavities opened on both sides inside the clamping plate, a sliding threaded sleeve is installed through one side of the installation cavity, a first screw rod is threadedly connected inside the sliding threaded sleeve, a limiting plate is rotatably installed at one end of the first screw rod located inside the installation cavity, a wedge-shaped clamping block is fixedly installed on one side of the limiting plate away from the first screw rod, one side of the wedge-shaped clamping block penetrates through the clamping plate and extends into the inside of the clamping groove, and the clamping plate is clamped with the clamping groove.

[0009] Preferably, a pressing spring is fixedly installed between the limiting plate and the inner wall of the installation cavity, and a first handle is fixedly installed at one end of the first screw rod located outside the clamping plate.

[0010] Preferably, installation grooves are opened on both sides inside the fixed block, sliders are slidably installed inside the installation grooves, a supporting spring is fixedly installed on one side of the slider, one end of the supporting spring away from the slider penetrates through the installation groove and extends to the outside of the fixed block, and a pushing plate is fixedly installed at one end of the supporting spring located outside the fixed block.

[0011] Preferably, two second screw rods are installed through one side of the fixed block, one ends of the two second screw rods located inside the fixed block penetrate through the installation groove and are rotatably connected to the other side of the slider, and the fixed block is in threaded connection with the second screw rods.

[0012] Preferably, a second handle is fixedly installed at one end of the second screw rod located outside the fixed block, and anti-slip grooves are opened on the surface of the second handle.

[0013] Preferably, the pneumatic actuator includes a T-shaped shell arranged at the top of the pneumatic valve body, a piston plate is slidably installed inside the T-shaped shell, a piston rod is fixedly installed at the bottom of the piston plate, the bottom end of the piston rod is installed at the bottom of the inner cavity of the T-shaped shell, and a return spring is sleeved at the bottom of the piston rod surface.

[0014] Preferably, one side of the top of the valve positioner body is connected and installed with a connecting pipe, and one end of the connecting pipe away from the valve positioner body is communicated with one side of the top of the T-shaped shell.

[0015] Preferably, second handles are provided on both sides inside the clamping plate, guide rails are fixedly installed on the tops of both sides of the fixed block, and the clamping plate is slidably connected to the guide rails through the second handles.

[0016] Preferably, the shape of the push plate is "rectangular", and the material of the push plate is a rubber component.

[0017] The beneficial effects of the present utility model are as follows:

[0018] 1. When installing the valve positioner body, the clamping plate uses the sliding connection between the second handle and the guide rail to clamp the clamping plate on the surface of the fixed block. When the clamping plate slides to a certain position on the surface of the fixed block, the wedge-shaped clamping block automatically enters the inside of the clamping groove by the elasticity of the pressing spring. At the same time, the wedge-shaped clamping block is further extended into the inside of the clamping groove by using the threaded connection between the first screw and the sliding threaded sleeve, strengthening the connection stability between the fixed block and the clamping plate. When disassembly is required, reverse the first handle to separate the wedge-shaped clamping block from the clamping groove, which can increase the connection strength between the fixed block and the clamping plate. Even when the first screw backs off, the wedge-shaped clamping block can be clamped in the clamping groove by the elasticity of the pressing spring, preventing the valve positioner body from falling off;

[0019] 2. During the connection process between the fixed block and the clamping plate, the clamping plate approaches the fixed block along the arrangement of the guide rail. When the wedge-shaped clamping block is clamped with the clamping groove, the push plate is driven by the elasticity of the support spring to push the clamping plate, further improving the clamping strength between the wedge-shaped clamping block and the clamping groove. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the present utility model;

[0021] Figure 2 is a cross-sectional structural diagram of the pneumatic actuator of the present utility model;

[0022] Figure 3 is a partial structural diagram of the disassembly and assembly mechanism of the present utility model;

[0023] Figure 4 is Figure 3 the enlarged view of area A in

[0024] Figure 5 is a cross-sectional structural diagram of the fixed block of the present utility model.

[0025] In the figure: 10, pneumatic valve body; 11, connecting flange; 12, pneumatic actuator; 121, T-shaped shell; 123, piston plate; 124, piston rod; 125, return spring; 13, valve positioner body; 14, connecting pipe; 20, disassembly and assembly mechanism; 21, fixing block; 22, clamping plate; 23, clamping groove; 24, connecting piece; 241, installation cavity; 242, sliding thread sleeve; 243, first screw; 244, limiting plate; 245, wedge-shaped clamping block; 246, abutting spring; 247, first handle; 248, installation groove; 249, slider; 2401, supporting spring; 2402, push plate; 2403, second screw; 2404, second handle. Detailed implementation mode

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] During specific implementation: As Figures 1-5 shown, an electric valve positioner convenient for disassembly and maintenance includes:

[0028] A pneumatic valve body 10, a connecting flange 11 is arranged at the top of the pneumatic valve body 10, a pneumatic actuator 12 is installed through connection on the pneumatic valve body 10, and a valve positioner body 13 is arranged on the front surface of the pneumatic actuator 12;

[0029] A disassembly and assembly mechanism 20, the disassembly and assembly mechanism 20 is installed between the pneumatic actuator 12 and the valve positioner body 13 and can disassemble and assemble the valve positioner body 13;

[0030] Among them. The disassembly and assembly mechanism 20 includes a fixing block 21 fixedly installed on the surface of the pneumatic actuator 12, a clamping plate 22 is fixedly installed on one side of the valve positioner body 13, clamping grooves 23 are opened on both sides of the fixing block 21, and a connecting piece 24 is installed through the inside of the clamping plate 22, and the connecting piece 24 is used for disassembling and assembling the valve positioner body 13.

[0031] As Figure 2 , Figure 3 and Figure 4As shown, the connecting member 24 includes two installation cavities 241 formed on both sides inside the clamping plate 22. A sliding threaded sleeve 242 is installed through one side of the installation cavity 241. A first screw rod 243 is threadedly connected inside the sliding threaded sleeve 242. One end of the first screw rod 243 located inside the installation cavity 241 is rotatably installed with a limiting plate 244. A wedge-shaped clamping block 245 is fixedly installed on one side of the limiting plate 244 away from the first screw rod 243. One side of the wedge-shaped clamping block 245 penetrates through the clamping plate 22 and extends into the inside of the card slot 23, and the clamping plate 22 is clamped with the card slot 23;

[0032] In this embodiment, the clamping plate 22 uses the sliding connection of the second handle 2404 with the guide rail to clamp the clamping plate 22 on the surface of the fixed block 21. When the clamping plate 22 slides to a certain position on the surface of the fixed block 21, the wedge-shaped clamping block 245 automatically enters the inside of the card slot 23 by the elasticity of the pressing spring 246. At the same time, the wedge-shaped clamping block 245 is further extended into the inside of the card slot 23 by using the threaded connection between the first screw rod 243 and the sliding threaded sleeve 242, strengthening the connection stability between the fixed block 21 and the clamping plate 22. When disassembly is required, reverse the first handle 247 to separate the wedge-shaped clamping block 245 from the card slot 23;

[0033] In this embodiment, a pressing spring 246 is fixedly installed between the limiting plate 244 and the inner wall of the installation cavity 241. One end of the first screw rod 243 located outside the clamping plate 22 is fixedly installed with a first handle 247; it has the advantage of facilitating the extension of the wedge-shaped clamping block 245 into the inside of the card slot 23, so as to further increase the stability between the fixed block 21 and the clamping plate 22;

[0034] In this embodiment, second handles 2404 are provided on both sides inside the clamping plate 22. Guide rails are fixedly installed on the tops of both sides of the fixed block 21. The clamping plate 22 is slidably connected to the guide rail through the second handle 2404; it has the advantage of being able to perform sliding guidance when the fixed block 21 is connected to the clamping plate 22, so as to maintain the connection stability between the fixed block 21 and the clamping plate 22.

[0035] As Figure 2 and Figure 4 shown, installation grooves 248 are provided on both sides inside the fixed block 21. Sliders 249 are slidably installed inside the installation grooves 248. A support spring 2401 is fixedly installed on one side of the slider 249. One end of the support spring 2401 away from the slider 249 penetrates through the installation groove 248 and extends to the outside of the fixed block 21. A push plate 2402 is fixedly installed at the end of the support spring 2401 located outside the fixed block 21;

[0036] In this embodiment, during the connection process between the fixed block 21 and the clamping plate 22, the clamping plate 22 approaches the fixed block 21 along the arrangement of the guide rail. After the wedge-shaped clamping block 245 is clamped with the clamping groove 23, the elastic force of the support spring 2401 drives the push plate 2402 to push the clamping plate 22, further enhancing the clamping strength between the wedge-shaped clamping block 245 and the clamping groove 23;

[0037] In this embodiment, two second screw rods 2403 are installed through one side of the fixed block 21. One ends of the two second screw rods 2403 located inside the fixed block 21 pass through the installation groove 248 and are rotatably connected to the other side of the slider 249. The fixed block 21 is in threaded connection with the second screw rods 2403; the elastic force of the support spring 2401 can be adjusted by the threaded connection between the second screw rods 2403 and the fixed block 21, avoiding the situation that the elastic force of the support spring 2401 is insufficient and affecting the support of the push plate 2402 on the clamping plate 22; one end of the second screw rod 2403 located outside the fixed block 21 is fixedly installed with a second handle 2404, and anti-slip grooves are formed on the surface of the second handle 2404; the shape of the push plate 2402 is "rectangular", and the material of the push plate 2402 is a rubber component.

[0038] As Figure 1 and Figure 2 shown, the pneumatic actuator 12 includes a T-shaped shell 121 arranged on the top of the pneumatic valve body 10. A piston plate 123 is slidably installed inside the T-shaped shell 121. A piston rod 124 is fixedly installed at the bottom of the piston plate 123. The bottom end of the piston rod 124 is installed at the bottom of the inner cavity of the T-shaped shell 121. A return spring 125 is sleeved on the bottom surface of the piston rod 124; one side of the top of the valve positioner main body 13 is communicated and installed with a connecting pipe 14. One end of the connecting pipe 14 away from the valve positioner main body 13 is communicated with one side of the top of the T-shaped shell 121;

[0039] In this embodiment, by means of the connection of the connecting pipe 14, the gas entering the pneumatic actuator 12 can push the valve positioner main body 13 to move, so that the piston rod 124 drives the valve core in the pneumatic valve body 10 to open, and the return spring 125 on the surface of the piston rod 124 can play a role in assisting the reset, facilitating the closing of the pneumatic valve body 10.

[0040] When the present utility model installs the valve positioner main body 13, the clamping plate 22 is clamped on the surface of the fixed block 21 by the sliding connection of the second handle 2404 and the guide rail. When the clamping plate 22 slides to a certain position on the surface of the fixed block 21, the wedge-shaped clamping block 245 automatically enters the inside of the clamping groove 23 by the elasticity of the abutting spring 246. At the same time, the wedge-shaped clamping block 245 is further extended into the inside of the clamping groove 23 by the threaded connection of the first screw 243 and the sliding threaded sleeve 242, strengthening the connection stability between the fixed block 21 and the clamping plate 22. When disassembly is required, reversing the first handle 247 to separate the wedge-shaped clamping block 245 from the clamping groove 23 can achieve disassembly.

[0041] In addition, it should be understood that although this specification is described according to embodiments, not each embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An electric valve positioner that is convenient for disassembly and maintenance, characterized in that Including: A pneumatic valve body (10), a connecting flange (11) is provided at the top of the pneumatic valve body (10), the pneumatic valve body (10) is installed with a pneumatic actuator (12) through communication, and a valve positioner main body (13) is provided on the front surface of the pneumatic actuator (12); A disassembly and assembly mechanism (20), the disassembly and assembly mechanism (20) is installed between the pneumatic actuator (12) and the valve positioner main body (13) and can disassemble and assemble the valve positioner main body (13); Among them, the disassembly and assembly mechanism (20) includes a fixed block (21) fixedly installed on the surface of the pneumatic actuator (12), a clamping plate (22) is fixedly installed on one side of the valve positioner main body (13), clamping grooves (23) are opened on both sides of the fixed block (21), a connecting member (24) is installed through the inside of the clamping plate (22), and the connecting member (24) is used for disassembling and assembling the valve positioner main body (13).

2. The electro-pneumatic valve positioner according to claim 1, which is convenient for disassembly and maintenance, is characterized in that: The connecting member (24) includes two installation cavities (241) opened on both sides inside the clamping plate (22), a sliding threaded sleeve (242) is installed through one side of the installation cavity (241), a first screw rod (243) is threadedly connected inside the sliding threaded sleeve (242), a limiting plate (244) is rotatably installed at one end of the first screw rod (243) located inside the installation cavity (241), a wedge-shaped clamping block (245) is fixedly installed on the side of the limiting plate (244) away from the first screw rod (243), one side of the wedge-shaped clamping block (245) penetrates through the clamping plate (22) and extends into the inside of the clamping groove (23), and the clamping plate (22) is clamped with the clamping groove (23).

3. The electro-pneumatic valve positioner according to claim 2, characterized in that: A pressing spring (246) is fixedly installed between the limiting plate (244) and the inner wall of the installation cavity (241), and a first handle (247) is fixedly installed at one end of the first screw rod (243) located outside the clamping plate (22).

4. The electric valve positioner that is convenient for disassembly and maintenance according to claim 1, wherein: Installation grooves (248) are opened on both sides inside the fixed block (21), sliders (249) are slidably installed inside the installation grooves (248), a support spring (2401) is fixedly installed on one side of the slider (249), one end of the support spring (2401) away from the slider (249) penetrates through the installation groove (248) and extends to the outside of the fixed block (21), and a push plate (2402) is fixedly installed at one end of the support spring (2401) located outside the fixed block (21).

5. The electro-pneumatic valve positioner according to claim 4, characterized in that: Two second screw rods (2403) are installed through one side of the fixed block (21), one ends of the two second screw rods (2403) located inside the fixed block (21) penetrate through the installation groove (248) and are rotatably connected to the other side of the slider (249), and the fixed block (21) is threadedly connected with the second screw rod (2403).

6. The electric valve positioner according to claim 5, which is convenient for disassembly and maintenance, is characterized in that: A second handle (2404) is fixedly installed at one end of the second screw rod (2403) located outside the fixed block (21), and anti-slip grooves are opened on the surface of the second handle (2404).

7. The electro-pneumatic valve positioner according to claim 1, which is convenient for disassembly and maintenance, is characterized in that: The pneumatic actuator (12) includes a T-shaped housing (121) provided at the top of the pneumatic valve body (10). A piston plate (123) is slidably installed inside the T-shaped housing (121). A piston rod (124) is fixedly installed at the bottom of the piston plate (123). The bottom end of the piston rod (124) is installed at the bottom of the inner cavity of the T-shaped housing (121). A return spring (125) is sleeved on the bottom surface of the piston rod (124).

8. An electric valve positioner that is convenient for disassembly and maintenance according to claim 1, characterized in that: One side at the top of the valve positioner body (13) is communicated and installed with a connecting pipe (14). One end of the connecting pipe (14) away from the valve positioner body (13) is communicated with one side at the top of the T-shaped housing (121).

9. The electric valve positioner according to claim 1, which is convenient for disassembly and maintenance, is characterized in that: Second handles (2404) are provided on both sides inside the clamping plate (22). Guide rails are fixedly installed on the tops of both sides of the fixed block (21). The clamping plate (22) is slidably connected to the guide rails through the second handles (2404).

10. A kind of electric valve positioner convenient for disassembly and maintenance according to claim 4, characterized in that: The shape of the push plate (2402) is "rectangular", and the material of the push plate (2402) is a rubber component.

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