A valve positioner with isolation and explosion-proof functions

Abstract

The present invention relates to the technical field of valve positioners, and in particular to a valve positioner with isolation and explosion-proof functions; the valve positioner comprises an outer shell, wherein a first chamber and a second chamber are provided inside the outer shell; a junction box is arranged inside the first chamber, and a wire pressing hole is provided at one end of the junction box away from the opening side, and an arc-shaped wiring board is provided on the wire pressing hole, and a wire inlet is opened in the first chamber, and a sealed wiring board is slidably connected to the inside of the junction box, and a plurality of guide holes corresponding to the arc-shaped wiring board are provided on the sealed wiring board; the wire pressing plate comprises an upper wire pressing plate and a lower wire pressing plate, and a semicircular wire pressing groove is provided on the side where the upper wire pressing plate and the lower wire pressing plate are close to each other; the valve positioner effectively solves the problem that during the installation process of the traditional valve positioner, the shell must be opened to expose the wiring terminal to complete the line connection, and flammable gas and dust are very likely to enter the shell and accumulate; the present invention is easy to install, effectively reduces the entry of dust or flammable and explosive gas into the interior of the device, thereby reducing the risk of explosion.

Description

Technical Field

[0001] The present invention relates to the technical field of valve positioners, and in particular to a valve positioner with isolation and explosion-proof functions. Background Art

[0002] Currently, during the installation process, traditional valve positioners must be opened to expose the wiring terminals and complete the wiring connection. In flammable and explosive environments, this operation method allows flammable gases and dust to easily enter and accumulate inside the housing, posing a significant safety hazard for subsequent operation.

[0003] Furthermore, critical components within traditional valve positioners, such as the circuit control board, terminal block, sensors, and electrical conversion unit, are susceptible to short circuits, overloads, and other faults over long-term operation due to environmental corrosion, mechanical vibration, and other factors. Once a fault occurs, sparks or arcs can form between components, accompanied by a sudden increase in local temperature. Flammable and explosive materials that have entered the housing are difficult to expel, and these sparks, arcs, and high temperatures can ignite the combustible medium, causing not only equipment damage but also a serious threat to the lives of on-site personnel. Furthermore, existing valve positioners lack effective power-off protection mechanisms, preventing them from shutting off power at the moment of a fault, further exacerbating the risk of open flames.

[0004] Therefore, the present invention provides a valve positioner with isolation and explosion-proof functions to solve the above problems. Summary of the Invention

[0005] In response to the above situation and to overcome the shortcomings of the existing technology, the present invention provides a valve positioner with isolation and explosion-proof functions. This effectively solves the problem that during the installation process of traditional valve positioners, the housing must be opened to expose the wiring terminals to complete the line connection. In flammable and explosive environments, combustible gases and dust can easily enter the interior of the housing and accumulate, and when electric arcs or sparks are generated, they can easily ignite the combustible medium. At the same time, the existing valve positioner lacks an effective power-off protection mechanism and cannot cut off the power supply at the moment of fault occurrence, further exacerbating the risk of open flames.

[0006] The present invention solves the technical problem as follows: A valve positioner with isolation and explosion-proof functions, comprising:

[0007] An outer shell, the outer shell is rectangular, and the interior of the outer shell is separated into a first chamber and a second chamber by an isolation plate;

[0008] A top cover, fixedly connected to the top of the outer shell;

[0009] A junction box is disposed inside the first chamber, with an opening on one side of the junction box. A wire pressing hole is provided at one end of the junction box away from the opening, and a curved wiring board is provided on the wire pressing hole. The curved wiring board is connected to the second chamber via a wire;

[0010] A wire inlet, the wire inlet being provided in the first chamber, and the open end of the junction box being fixedly connected to the wire inlet;

[0011] A sealed wiring board is slidably connected to the interior of the junction box, and the sealed wiring board is provided with a plurality of guide holes corresponding to the arc-shaped wiring board;

[0012] A wire pressing plate, comprising an upper wire pressing plate and a lower wire pressing plate, wherein a semicircular wire pressing groove is provided on one side of the upper wire pressing plate and the lower wire pressing plate close to each other, the wire pressing groove corresponds to the guide hole, and the upper wire pressing plate is slidably connected to the sealed terminal plate;

[0013] The clamping control structure includes guide grooves provided on both sides of the junction box, the guide grooves including horizontal grooves and inclined grooves, and guide shafts matching the guide grooves are fixedly connected to both ends of the upper wire pressing plate;

[0014] The locking structure is used to lock the position of the sealed terminal block.

[0015] Preferably, a plurality of compression blocks arranged at intervals are provided inside the wire pressing groove.

[0016] Preferably, it also includes a terminal clamping structure, which includes a terminal clamping plate slidably connected to the terminal box, and a plurality of lower pressure blocks that cooperate with the arc-shaped terminal block are fixedly connected to the terminal clamping plate, and a compression spring is arranged between the terminal clamping plate and the terminal box.

[0017] Preferably, both ends of the sealed terminal block are fixedly connected to a push plate, the upper end of the push plate is fixedly connected to a semicircular push block, both ends of the terminal clamping plate are fixedly connected to a driven plate, and the lower end of the driven plate is fixedly connected to a driven block that cooperates with the push block.

[0018] Preferably, the locking structure includes a locking shaft fixedly connected to the end of the sealed terminal block away from the wire inlet, a locking hole matching the locking shaft is provided at the end of the terminal box away from the wire inlet, a locking groove is provided on the locking shaft, a U-shaped locking piece is slidably connected to the end of the terminal box away from the wire inlet, a clamping plate matching the locking groove is fixedly connected to the U-shaped locking piece, and a locking spring is installed between the U-shaped locking piece and the terminal box.

[0019] Preferably, the second chamber is used to install the main board, a mercury thermometer is provided inside the second chamber, and the upper and lower ends of the mercury thermometer are respectively connected to the main board through wires, a mini electric push rod is fixedly connected to the first chamber, and the mini electric push rod is connected to the main board through wires, a wire pulling control board is slidably connected to the first chamber, the wire pulling control board is fixedly connected to the protruding end of the mini electric push rod, an unlocking push block is fixedly connected to the lower end of the wire pulling control board, the unlocking push block is configured as a right-angled trapezoid, and an unlocking mating block that cooperates with the unlocking push block is fixedly connected to the U-shaped locking piece;

[0020] One end of the sealed terminal block away from the locking shaft is fixedly connected to a driving shaft, and a wire pulling spring is installed between the driving shaft and the terminal box.

[0021] Preferably, the junction box is slidably connected to one side away from the open end with two shielding plates symmetrically arranged up and down, the shielding plates are used to shield the wire pressing holes, and a shielding spring is connected between the shielding plates and the junction box;

[0022] Conical support blocks are provided at both ends of the sealed wiring board, and a support rod matched with the support blocks is fixedly connected to one side of the shielding plate close to the sealed wiring board.

[0023] Preferably, heat dissipation plates are detachably connected to both sides of the outer shell, and the heat dissipation plates are made of aluminum.

[0024] Preferably, a sand storage chamber is provided on the top cover, the sand storage chamber is used to store sand, the sand storage chamber is located inside the second chamber, and a plurality of sand outlet holes are opened on the side of the sand storage chamber close to the second chamber;

[0025] A blocking plate is slidably connected to the interior of the sand storage chamber. A plurality of communicating holes cooperating with the sand outlet holes are opened on the blocking plate. The blocking plate is fixedly connected to the wire pulling control plate.

[0026] Preferably, a feedback shaft is rotatably connected to the bottom of the second chamber, and the feedback shaft is electrically connected to the main board. A protective plate is provided in the middle of the second chamber, and the main board and the feedback shaft are separated by the second chamber. An adjustment window is provided on the side wall of the second chamber, and the adjustment window is detachably connected to a cover plate.

[0027] The beneficial effects of the present invention are:

[0028] The present invention solves the problem that during the installation of a traditional valve positioner, the housing must be opened to expose the wiring terminals and complete the line connection. In an inflammable and explosive environment, flammable gas and dust can easily enter the housing and accumulate, and when an arc or spark is generated, it can easily ignite the flammable medium.

[0029] By adding a terminal clamping plate, a lower pressing block, a clamping spring, a push plate, a push block, a driven plate and a driven block, the power cord is further fixed so that the power cord and the arc-shaped terminal block fit tightly, thereby reducing the generation of arcs or sparks;

[0030] By adding a locking shaft, a locking hole, a locking groove, a U-shaped locking piece, a card plate, a locking spring, a main board, a mercury thermometer, a mini electric push rod, a wire pulling control board, an unlocking push block, an unlocking mating block, a push shaft and a wire pulling spring, the problem of the existing valve positioner lacking an effective power-off protection mechanism and being unable to cut off the power supply at the moment of a fault, which further exacerbates the risk of open flames, is solved;

[0031] By adding sand storage chambers, sand outlet holes, baffles and connecting holes, it is possible to prevent the generation of open flames or prevent the further spread of open flames.

[0032] The present invention is easy to install and can effectively reduce dust or flammable and explosive gases from entering the interior of the device, thereby reducing the risk of explosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 It is a schematic diagram of the overall assembly of the present invention;

[0035] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0036] Figure 3 is a schematic diagram of a junction box of the present invention;

[0037] Figure 4 This is a schematic diagram of the installation position of the arc-shaped terminal block of the present invention;

[0038] Figure 5 Schematic diagram of the upper wire pressing plate of the present invention;

[0039] Figure 6 This invention Figure 5 A partial enlarged schematic diagram in the middle;

[0040] Figure 7 This is a schematic diagram of the position of the wire pressing hole of the present invention;

[0041] Figure 8 This is a schematic diagram of the installation position of the shielding plate of the present invention;

[0042] Figure 9 This is a schematic diagram of the sealed terminal block and the masking plate in the present invention in the coordinated state;

[0043] Figure 10 is a schematic diagram of a U-shaped locking member of the present invention;

[0044] Figure 11 is a schematic cross-sectional view of a junction box of the present invention;

[0045] Figure 12 This invention Figure 11 A partial enlarged schematic diagram of point B in the middle;

[0046] Figure 13 This is a schematic diagram of the back structure of the top cover of the present invention;

[0047] Figure 14 is a schematic diagram of a barrier plate of the present invention;

[0048] Figure 15 This invention Figure 14 A partial enlarged schematic diagram of point C in the middle;

[0049] Figure 16 It is a cross-sectional schematic diagram of the sand storage chamber of the present invention;

[0050] Figure 17 It is a schematic cross-sectional view of the outer shell of the present invention.

[0051] In the figure, 1, outer shell; 2, first chamber; 3, second chamber; 4, top cover; 5, junction box; 6, wire pressing hole; 7, curved terminal block; 8, wire entry port; 9, sealed terminal block; 10, guide hole; 11, upper wire pressing plate; 12, lower wire pressing plate; 13, wire pressing groove; 14, guide groove; 141, horizontal groove; 142, inclined groove; 15, guide shaft; 16, clamping block; 17, terminal clamping plate; 18, lower clamping block; 19, clamping spring; 20, push plate; 21, push block; 22, driven plate; 23, driven block; 24, locking shaft; 25, Locking hole; 26. Locking groove; 27. U-shaped locking piece; 28. Card; 29. ​​Locking spring; 30. Main board; 31. Mercury thermometer; 32. Mini electric push rod; 33. Pull-out control board; 34. Unlocking push block; 35. Unlocking matching block; 36. Push shaft; 37. Pull-out spring; 38. Shielding plate; 39. Shielding spring; 40. Support block; 41. Support rod; 42. Heat sink; 43. Sand storage chamber; 44. Sand outlet hole; 45. Blocking plate; 46. Connecting hole; 47. Feedback shaft; 48. Protective plate; 49. Adjustment window; 50. Cover plate. DETAILED DESCRIPTION

[0052] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0053] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0054] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present invention, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement an apparatus and / or practice a method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this apparatus and / or practice this method.

[0055] It should also be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. The illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0056] Additionally, in the following description, specific details are provided to provide a thorough understanding of the examples. However, one skilled in the art will appreciate that the aspects described can be practiced without these specific details.

[0057] Example 1, refer to the attached Figure 1-17 , a valve positioner with isolation and explosion-proof function, characterized by comprising:

[0058] The outer shell 1 is rectangular, and the interior of the outer shell 1 is separated into a first chamber 2 and a second chamber 3 by an isolation plate;

[0059] A top cover 4 is fixedly connected to the top of the outer shell 1;

[0060] A junction box 5 is disposed inside the first chamber 2. One side of the junction box 5 is open. A wire pressing hole 6 is provided at one end of the junction box 5 away from the open side. A curved terminal block 7 is provided on the wire pressing hole 6. The curved terminal block 7 is connected to the second chamber 3 via a wire. The junction box 5 is made of non-metallic material, and the curved terminal block 7 is made of metal material.

[0061] A wire inlet 8 is provided in the first chamber 2, and an opening end of the junction box 5 is fixedly connected to the wire inlet 8;

[0062] The sealed terminal block 9 is slidably connected to the inside of the junction box 5, and a plurality of guide holes 10 corresponding to the arc-shaped terminal block 7 are opened on the sealed terminal block 9;

[0063] The wire pressing plate includes an upper wire pressing plate 11 and a lower wire pressing plate 12. A semicircular wire pressing groove 13 is provided on one side of the upper wire pressing plate 11 and the lower wire pressing plate 12 close to each other. The wire pressing groove 13 corresponds to the guide hole 10. The upper wire pressing plate 11 is slidably connected to the sealed terminal block 9.

[0064] A plurality of compression blocks 16 are provided inside the wire pressing groove 13 at intervals, so as to further compress the power wire.

[0065] The clamping control structure includes guide grooves 14 provided on both sides of the junction box 5. The guide grooves 14 include a horizontal groove 141 and an inclined groove 142. Both ends of the upper wire pressing plate 11 are fixedly connected to guide shafts 15 that match the guide grooves 14.

[0066] After the power cord is connected to the power supply 11, it is pushed into the guide hole 10, and then the sealing terminal block 9 is pushed in the direction close to the wire pressing hole 6. In the initial state, the sealing terminal block 9 is located near the wire entering port 8, and the guide shaft 15 is located in the inclined groove 142. At this time, the upper wire pressing plate 11 and the lower wire pressing plate 12 are in a separated state. The sealing terminal block 9 is pushed in the direction close to the wire pressing hole 6, and the guide shaft 15 slides from the high position of the inclined groove 142 to the low position until the guide shaft 15 enters the horizontal groove 141. At this time, the upper wire pressing plate 11 and the lower wire pressing plate 12 are in a fitted state, thereby pressing the power cord to be connected, and continuing to push the sealing terminal block 9 in the direction close to the wire pressing hole 6, the sealing terminal block 9 drives the power cord to be connected to move synchronously until it is inserted into the wire pressing hole 6, and the exposed metal wire end at the power cord joint fits with the arc terminal block 7, thereby realizing the operation of installing the power cord.

[0067] Embodiment 2 also includes a terminal clamping structure, which includes a terminal clamping plate 17 slidably connected to the terminal box 5. A slide groove is provided on the terminal box 5, and the terminal clamping plate 17 is slidably connected inside the slide groove. A plurality of lower pressing blocks 18 that cooperate with the arc-shaped terminal block 7 are fixedly connected to the terminal clamping plate 17. A clamping spring 19 is provided between the terminal clamping plate 17 and the terminal box 5. In the initial state, under the action of the clamping spring 19, the terminal clamping plate 17 is pushed to slide in the direction close to the arc-shaped terminal block 7, so that the lower pressing block 18 is fitted in the direction close to the arc-shaped terminal block 7 until it presses the power cord between the lower pressing block 18 and the arc-shaped terminal block 7.

[0068] refer to Figure 4 Both ends of the sealed terminal block 9 are fixedly connected to a push plate 20, the upper end of the push plate 20 is fixedly connected to a semicircular push block 21, both ends of the terminal clamping plate 17 are fixedly connected to a driven plate 22, and the lower end of the driven plate 22 is fixedly connected to a driven block 23 that cooperates with the push block 21.

[0069] When in use, the sealed terminal block 9 is pushed toward the direction close to the wire pressing hole 6. At this time, the arc surface of the pushing block 21 contacts the arc surface of the driven block 23. Then the pushing block 21 pushes the driven block 23 to move in the direction away from the arc terminal block 7, and at the same time pushes the terminal clamping plate 17 in the direction away from the arc terminal block 7, so that the arc terminal block 7 and the lower pressing block 18 are separated. After the pushing block 21 and the driven block 23 are disengaged, the terminal clamping plate 17 is pushed to slide toward the direction close to the arc terminal block 7 under the action of the compression spring 19, so that the lower pressing block 18 fits in the direction close to the arc terminal block 7.

[0070] In a third embodiment, a locking structure is used to lock the position of the sealed terminal block 9. The locking structure includes a locking shaft 24 fixedly connected to the end of the sealed terminal block 9 away from the wire inlet 8. A locking hole 25 is defined at the end of the terminal box 5 away from the wire inlet 8, which cooperates with the locking shaft 24. During installation, the locking shaft 24 is passed through the locking hole 25. The locking shaft 24 is defined by a locking groove 26. A U-shaped locking member 27 is slidably connected to the end of the terminal box 5 away from the wire inlet 8. A clamping plate 28 is fixedly connected to the U-shaped locking member 27, which cooperates with the locking groove 26. A locking spring 29 is installed between the U-shaped locking member 27 and the terminal box 5.

[0071] In the initial state, under the action of the locking spring 29, the U-shaped locking piece 27 is pushed to slide in the direction close to the locking shaft 24, so that the card plate 28 contacts the outer wall of the locking shaft 24. When in use, the sealing terminal plate 9 is pushed in the direction close to the wire pressing hole 6 until the sealing terminal plate 9 is pushed to the limit position, so that the position of the card plate 28 and the locking groove 26 coincides, and then the U-shaped locking piece 27 is pushed in the direction close to the locking shaft 24 under the action of the locking spring 29 until the card plate 28 is stuck in the locking groove 26, and the locking shaft 24 and the sealing terminal plate 9 are fixed in the current position.

[0072] The second chamber 3 is used to install the main board 30. A mercury thermometer 31 is provided inside the second chamber 3. The upper and lower ends of the mercury thermometer 31 are respectively connected to the main board 30 through wires. A mini electric push rod 32 is fixedly connected to the first chamber 2. The mini electric push rod 32 is connected to the main board 30 through wires. A wire pulling control board 33 is slidably connected to the first chamber 2. The wire pulling control board 33 is fixedly connected to the protruding end of the mini electric push rod 32. An unlocking push block 34 is fixedly connected to the lower end of the wire pulling control board 33. The unlocking push block 34 is set to a right-angled trapezoid. An unlocking mating block 35 that cooperates with the unlocking push block 34 is fixedly connected to the U-shaped locking member 27.

[0073] One end of the sealed terminal block 9 away from the locking shaft 24 is fixedly connected to a driving shaft 36 , and a wire pulling spring 37 is installed between the driving shaft 36 and the terminal box 5 .

[0074] In the initial state, when the temperature inside the second chamber 3 does not reach the preset temperature, the mercury column inside the mercury thermometer 31 is located at the initial position, so that the circuits at the upper and lower ends of the mercury thermometer 31 are disconnected.

[0075] During use, when the main board 30 inside the second chamber 3 has a short circuit, overload or other faults, electric sparks or arcs will be generated between the components, accompanied by a sudden rise in local temperature. At this time, the mercury column inside the mercury thermometer 31 rises inside the mercury thermometer 31. At this time, the circuits at the upper and lower ends of the mercury thermometer 31 are connected. At this time, the mini electric push rod 32 works, pulling the wire pulling control board 33 to move in the direction close to the U-shaped locking piece 27, until the inclined surface of the unlocking push block 34 contacts the inclined surface of the unlocking matching block 35, and then continue to pull the wire pulling control board 33 to move in the direction close to the U-shaped locking piece 27 until the unlocking push block 34 pushes the unlocking matching block 35 in the direction away from the locking shaft 24, pushing the U-shaped locking piece 27 through the unlocking matching block 35. 7 pushes the compressed locking spring 29 in the direction away from the locking shaft 24 until the card plate 28 disengages from the locking groove 26. Under the action of the wire pulling spring 37, the pushing shaft 36 is pulled in the direction away from the wire pressing hole 6, and the sealed terminal block 9 is simultaneously pushed to move in the direction away from the wire pressing hole 6. At this time, the arc surface of the pushing block 21 first contacts the arc surface of the driven block 23, and then the pushing block 21 pushes the driven block 23 to move in the direction away from the arc terminal block 7. At the same time, the terminal pressing plate 17 is pushed in the direction away from the arc terminal block 7, so that the arc terminal block 7 and the lower pressing block 18 are separated. At this time, the sealed terminal block 9 pulls the power cord in the direction away from the wire pressing hole 6, so that the power cord is detached from the arc terminal block 7 to cut off the power.

[0076] In the fourth embodiment, two shielding plates 38 symmetrically arranged up and down are slidably connected to the side of the junction box 5 away from the open end. The shielding plates 38 are used to cover the wire pressing holes 6. A shielding spring 39 is connected between the shielding plates 38 and the junction box 5. In the initial state, the shielding plates 38 are pushed toward each other under the action of the shielding spring 39 until the two shielding plates 38 are close to each other. The sides are fitted together, so that the two shielding plates 38 cover the wire pressing holes 6 to prevent flammable and explosive gases or dust from entering the first chamber 2 and the second chamber 3.

[0077] Conical support blocks 40 are provided at both ends of the sealing terminal block 9 , and a support rod 41 that matches the support block 40 is fixedly connected to one side of the shielding plate 38 close to the sealing terminal block 9 .

[0078] When in use, the sealed terminal block 9 is pushed to move toward the wire pressing hole 6. When the inclined surfaces at both ends of the support block 40 contact the support rod 41, the support block 40 pushes the support rod 41 to move away from the support block 40, thereby pushing the shielding plate 38 to move away from each other until the shielding plate 38 no longer blocks the wire pressing hole 6.

[0079] In the fifth embodiment, heat dissipation plates 42 are detachably connected to both sides of the outer shell 1 . The heat dissipation plates 42 are made of aluminum material, so as to dissipate the heat inside the second chamber 3 .

[0080] In the sixth embodiment, a sand storage chamber 43 is provided on the top cover 4. The sand storage chamber 43 is used to store sand. The sand storage chamber 43 is located inside the second chamber 3. A plurality of sand outlet holes 44 are opened on one side of the sand storage chamber 43 close to the second chamber 3.

[0081] A blocking plate 45 is slidably connected to the interior of the sand storage chamber 43 . The blocking plate 45 is provided with a plurality of communicating holes 46 that match the sand outlet holes 44 . The blocking plate 45 is fixedly connected to the wire pulling control board 33 .

[0082] In the initial state, the blocking plate 45 blocks the sand outlet 44 , the communicating hole 46 is disconnected from the sand outlet 44 , and the sand in the sand storage chamber 43 cannot flow out of the sand storage chamber 43 .

[0083] During use, when the main board 30 inside the second chamber 3 has a short circuit, overload or other faults, electric sparks or arcs will be generated between the components, accompanied by a sudden rise in local temperature. At this time, the mercury column inside the mercury thermometer 31 rises inside the mercury thermometer 31. At this time, the circuits at the upper and lower ends of the mercury thermometer 31 are connected. At this time, the mini electric push rod 32 works, pulling the wire pulling control board 33 toward the direction close to the U-shaped locking piece 27 until the connecting hole 46 and the sand outlet hole 44 are connected. At this time, the sand inside the sand storage chamber 43 flows into the second chamber 3 to cover the main board 30, preventing the main board 30 from generating open flames due to component short circuit or high temperature.

[0084] In the seventh embodiment, a feedback shaft 47 is rotatably connected to the bottom of the second chamber 3, and the feedback shaft 47 is electrically connected to the main board 30. A protective plate 48 is provided in the middle of the second chamber 3, and the main board 30 and the feedback shaft 47 are separated by the second chamber 3. An adjustment window 49 is provided on the side wall of the second chamber 3, and the adjustment window 49 is detachably connected to a cover 50. A sealing block is fixedly installed on one end of the cover 50 close to the adjustment window 49. When in use, the cover 50 is fixed to the adjustment window 49 by bolts. When the feedback shaft 47 needs to be adjusted, the cover 50 is removed from the adjustment window 49, and then the feedback shaft 47 is adjusted. This arrangement facilitates adjustment.

[0085] During specific use, the outer shell 1 is fixedly connected to the pneumatic control valve, the feedback shaft 47 is installed on the valve stem, the actuator is connected to the pneumatic control valve, and the valve stem in the pneumatic control valve is pushed by the actuator to move and thus change the opening size. The valve positioner is linked with the actuator to convert the valve stem displacement of the pneumatic control valve into an electrical signal, thereby realizing feedback control of the pneumatic control valve.

[0086] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A valve positioner with isolation and explosion-proof function, characterized in that: include: An outer shell (1), the outer shell (1) being arranged in a rectangular shape, and the interior of the outer shell (1) being separated into a first chamber (2) and a second chamber (3) by an isolation plate; A top cover (4) fixedly connected to the top of the outer shell (1); A junction box (5) is arranged inside the first chamber (2), one side of the junction box (5) is opened, an end of the junction box (5) away from the opening is provided with a wire pressing hole (6), an arc-shaped wiring board (7) is provided on the wire pressing hole (6), and the arc-shaped wiring board (7) is connected to the second chamber (3) via a wire; A wire inlet (8), the wire inlet (8) being provided in the first chamber (2), and the opening end of the junction box (5) being fixedly connected to the wire inlet (8); A sealed wiring board (9) is slidably connected to the interior of the junction box (5), and a plurality of guide holes (10) corresponding to the arc-shaped wiring board (7) are formed on the sealed wiring board (9); A wire pressing plate, comprising an upper wire pressing plate (11) and a lower wire pressing plate (12), wherein a semicircular wire pressing groove (13) is provided on one side of the upper wire pressing plate (11) and the lower wire pressing plate (12) close to each other, the wire pressing groove (13) and the guide hole (10) corresponding to each other, and the upper wire pressing plate (11) is slidably connected to the sealed terminal plate (9); A clamping control structure includes guide grooves (14) provided on both sides of the junction box (5), the guide grooves (14) including a horizontal groove (141) and an inclined groove (142), and guide shafts (15) matching the guide grooves (14) are fixedly connected to both ends of the upper wire pressing plate (11); A locking structure is used to lock the position of the sealing terminal plate (9).

2. The valve positioner with isolation and explosion-proof function according to claim 1, characterized in that: A plurality of spaced-apart pressing blocks (16) are provided inside the wire pressing groove (13).

3. The valve positioner with isolation and explosion-proof function according to claim 1, characterized in that: The terminal clamping structure further comprises a terminal clamping plate (17) slidably connected to the terminal box (5), a plurality of lower pressing blocks (18) matching the arc-shaped terminal block (7) are fixedly connected to the terminal clamping plate (17), and a clamping spring (19) is provided between the terminal clamping plate (17) and the terminal box (5).

4. The valve positioner with isolation and explosion-proof function according to claim 3, characterized in that: Both ends of the sealing terminal plate (9) are fixedly connected to a push plate (20), the upper end of the push plate (20) is fixedly connected to a semicircular push block (21), and both ends of the terminal clamping plate (17) are fixedly connected to a driven plate (22), and the lower end of the driven plate (22) is fixedly connected to a driven block (23) that matches the push block (21).

5. The valve positioner with isolation and explosion-proof function according to claim 1, characterized in that: The locking structure comprises a locking shaft (24) fixedly connected to the end of the sealed terminal block (9) away from the line inlet (8); a locking hole (25) is provided on the end of the terminal box (5) away from the line inlet (8) and matched with the locking shaft (24); a locking groove (26) is provided on the locking shaft (24); a U-shaped locking piece (27) is slidably connected to the end of the terminal box (5) away from the line inlet (8); a clamping plate (28) is fixedly connected to the U-shaped locking piece (27) and matched with the locking groove (26); and a locking spring (29) is installed between the U-shaped locking piece (27) and the terminal box (5).

6. The valve positioner with isolation and explosion-proof function according to claim 5, characterized in that: The second chamber (3) is used to install the main board (30). A mercury thermometer (31) is provided inside the second chamber (3). The upper and lower ends of the mercury thermometer (31) are connected to the main board (30) through wires respectively. A mini electric push rod (32) is fixedly connected inside the first chamber (2). The mini electric push rod (32) is connected to the main board (30) through wires. A wire pulling control board (33) is slidably connected inside the first chamber (2). The wire pulling control board (33) is fixedly connected to the extended end of the mini electric push rod (32). An unlocking push block (34) is fixedly connected to the lower end of the wire pulling control board (33). The unlocking push block (34) is set to a right-angled trapezoid. An unlocking matching block (35) that matches the unlocking push block (34) is fixedly connected to the U-shaped locking member (27). One end of the sealed terminal plate (9) away from the locking shaft (24) is fixedly connected to a driving shaft (36), and a wire pulling spring (37) is installed between the driving shaft (36) and the terminal box (5).

7. The valve positioner with isolation and explosion-proof function according to claim 1, characterized in that: Two shielding plates (38) symmetrically arranged up and down are slidably connected to a side of the junction box (5) away from the open end, the shielding plates (38) are used to shield the wire pressing hole (6), and a shielding spring (39) is connected between the shielding plates (38) and the junction box (5); Conical support blocks (40) are provided at both ends of the sealing terminal board (9), and a support rod (41) that matches the support block (40) is fixedly connected to one side of the shielding plate (38) close to the sealing terminal board (9).

8. The valve positioner with isolation and explosion-proof function according to claim 1, characterized in that: Both sides of the outer shell (1) are detachably connected to heat dissipation plates (42), and the heat dissipation plates (42) are made of aluminum.

9. The valve positioner with isolation and explosion-proof function according to claim 6, characterized in that: A sand storage chamber (43) is provided on the top cover (4), and the sand storage chamber (43) is used to store sand. The sand storage chamber (43) is located inside the second chamber (3), and a plurality of sand outlet holes (44) are opened on a side of the sand storage chamber (43) close to the second chamber (3); A blocking plate (45) is slidably connected to the interior of the sand storage chamber (43). The blocking plate (45) is provided with a plurality of communicating holes (46) that match the sand outlet holes (44). The blocking plate (45) is fixedly connected to the wire pulling control panel (33).

10. The valve positioner with isolation and explosion-proof function according to claim 1, characterized in that: The bottom of the second chamber (3) is rotatably connected to a feedback shaft (47), and the feedback shaft (47) is electrically connected to the main board (30). A protective plate (48) is provided in the middle of the second chamber (3), and the main board (30) and the feedback shaft (47) are separated by the second chamber (3). An adjustment window (49) is provided on the side wall of the second chamber (3), and the adjustment window (49) is detachably connected to a cover plate (50).

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