Pressure gauge with protection structure

Abstract

The invention relates to a pressure gauge, in particular to a pressure gauge with a protective structure. Comprising a meter body, a connecting pipe, a valve body, a valve rod, a handle, a fixing disc, a transmission mechanism, a supporting seat and a guide rod. A connecting pipe is connected to the bottom of the meter body, a valve rod is arranged on the valve body and connected with a handle, a fixing disc is arranged on the connecting pipe, a supporting base is installed on one side of the valve body, a guide rod is slidably connected to the supporting base, a connecting plate is connected to the guide rod, a bearing is installed at the end, away from the guide rod, of the connecting plate, and a hexagon nut is installed on the bearing. A transmission disc matched with the fixing disc is installed on the top of the hexagon nut. When the valve element of the valve body is closed, the hexagon nut moves upwards, the transmission disc is matched with the fixing disc, the hexagon nut is rotated to drive the connecting pipe to be disassembled, and therefore the meter body and the connecting pipe can be disassembled only when the valve is closed, the problem that a pressure meter is directly disassembled when the valve is forgotten to be closed, and consequently medium leakage is caused is solved, and safety is guaranteed.

Description

Technical Field

[0001] The present invention relates to a pressure gauge, and more particularly to a pressure gauge with a protective structure. Background Art

[0002] In industrial production and daily life, pressure gauges, as important measuring tools, are widely used for pressure monitoring of various fluid media. However, in harsh working environments, such as high-temperature, high-pressure, corrosive gas or liquid environments, traditional pressure gauges are prone to damage due to limitations in their structure and materials. Once a pressure gauge fails or is damaged, it not only affects normal production activities but also may pose a threat to the safe operation of the entire system. In such cases, it is usually necessary to immediately replace the damaged pressure gauge to restore the normal operation of the system.

[0003] When carrying out the replacement work of the pressure gauge, if the relevant valve is forgotten to be closed and the pressure gauge is directly disassembled, it may lead to medium leakage, thereby triggering a series of safety hazards, including but not limited to environmental pollution, equipment damage, and personal injury. Although theoretically measures can be taken immediately to close the valve when it is found that the valve is not closed, in actual operation, especially when the valve is exposed to a harsh environment for a long time and rusts, the valve may not be able to be closed smoothly. In such cases, not only will the treatment time be delayed, increasing the risk of dangerous substance leakage, but improper handling may also cause more serious safety accidents. Summary of the Invention

[0004] In order to overcome the drawback that when carrying out the replacement work of the pressure gauge, if the relevant valve is forgotten to be closed and the pressure gauge is directly disassembled, it may lead to medium leakage, thereby triggering a series of safety hazards, the present invention provides a pressure gauge with a protective structure.

[0005] A pressure gauge with a protective structure includes a gauge body, a connecting pipe, a valve body, a valve rod, a handle, a fixing plate, a transmission mechanism, a support seat, a guide rod, a connecting plate, a bearing, a hexagonal nut, and a transmission disc. The bottom of the gauge body is connected with the connecting pipe. The valve body is provided with a valve rod, and the valve rod is connected with the handle. The connecting pipe is provided with a fixing plate. A support seat is installed on one side of the valve body. A guide rod is slidably connected to the support seat. The guide rod is connected with a connecting plate. A bearing is installed at one end of the connecting plate away from the guide rod. A hexagonal nut is installed on the bearing. A transmission disc adapted to the fixing plate is installed on the top of the hexagonal nut. A transmission mechanism is installed on the valve body. When the handle is rotated to close the valve body, the rotational force of the valve rod drives the hexagonal nut to rise through the transmission mechanism, prompting the transmission disc to move upward and form a connection with the fixing plate. When the hexagonal nut is rotated, the connecting pipe is driven to rotate through the coordinated action of the fixing plate and the transmission disc, thereby adjusting the pre-tightening force of the threaded connection between the connecting pipe and the valve body.

[0006] As a further preferred solution, the transmission mechanism includes a threaded rod, a bevel gear set, and a threaded sleeve. A threaded rod is rotatably connected inside the support base. The threaded rod is drivingly connected to the valve stem through the bevel gear set. A threaded sleeve is connected to the connecting plate, and the threaded rod is threadedly connected to the threaded sleeve.

[0007] As a further preferred solution, an upper limit block and an upper limit groove are provided at the bottom of the fixed disk, and a lower limit block and a lower limit groove are provided at the top of the transmission disk. The upper limit block and the lower limit groove are respectively adapted to the lower limit groove and the lower limit block.

[0008] As a further preferred solution, a sliding ring and a compression spring are further included. The sliding ring is slidably connected to the top of the hexagonal nut. The upper end of the sliding ring is fixedly connected to the transmission disk. The two ends of the compression spring are respectively connected to the sliding ring and the hexagonal nut.

[0009] As a further preferred solution, a limit screw is further included. Limit holes are symmetrically opened on both sides of the sliding ring, and limit screws are symmetrically provided on both sides of the upper part of the hexagonal nut. The two limit screws on both sides respectively penetrate into the two limit holes.

[0010] As a further preferred solution, a driving mechanism is further included. The driving mechanism includes a connecting column, a connecting ring, a slider, a motor, a runner, and a compression spring. At least three connecting columns are circumferentially spaced and connected to the outer circumference of the bearing. The lower end of the connecting column is connected to the connecting ring. At least three guide grooves are circumferentially spaced and opened on the connecting ring. A slider is slidably connected in each guide groove. A motor is installed on the top of the slider, and the output shaft of the motor is connected to the runner.

[0011] As a further preferred solution, an induction component, a limit component, and a controller are further included. An induction component is provided on the valve body and the connecting pipe. A limit component is provided on the valve stem and the valve body. The controller is installed on the valve body. The induction component and the limit component are both electrically connected to the controller.

[0012] As a further preferred solution, the induction component includes a magnetic ring, an adjusting plate, and a Hall sensor. A magnetic ring is connected to the outer side of the lower part of the connecting pipe. The adjusting plate is connected to the valve body. A Hall sensor is installed at the upper end of the adjusting plate. The Hall sensor is located on one side of the magnetic ring. The Hall sensor is electrically connected to the controller.

[0013] As a further preferred solution, the limit component includes a ratchet wheel, an electromagnet, a permanent magnet, and a ratchet tooth. A ratchet wheel is connected to the outer side of the valve stem. The electromagnet is connected to the valve body below the ratchet wheel. A permanent magnet is provided above the electromagnet and is slidably connected thereto. A ratchet tooth adapted to the ratchet wheel is provided at the top of the permanent magnet. The electromagnet is electrically connected to the controller.

[0014] The present invention has the following advantages: 1. When turning the handle of the present invention, the valve stem rotates and drives the hexagonal nut to move through the transmission mechanism. When opening the valve core of the valve body, the hexagonal nut moves downward, the fixed disk disengages from the transmission disk, and turning the hexagonal nut cannot drive the fixed disk to rotate, and the connecting pipe cannot be manually disassembled from the valve body. When the valve core of the valve body is not closed, the dial cannot be disassembled; when closing the valve core of the valve body, the hexagonal nut moves upward, the transmission disk cooperates with the fixed disk, and turning the hexagonal nut drives the connecting pipe to be disassembled. Therefore, the meter body and the connecting pipe can be disassembled only when the valve is closed, avoiding the problem of medium leakage caused by directly disassembling the pressure gauge without closing the valve, ensuring safety.

[0015] 2. Through the induction component and the controller, the present invention can automatically limit the opening action of the valve stem in the case of detecting that the offset between the connecting pipe and the valve body causes seal failure, ensuring that the medium flow has been safely cut off before any disassembly operation, effectively avoiding the risk of medium leakage caused by misoperation.

[0016] 3. When it is necessary to replace the pressure gauge, the tightening or loosening operation of the connecting pipe can be completed without manual labor through the driving mechanism, reducing the risk of staff exposure to potential dangerous environments and improving work efficiency at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structure diagram of the present invention.

[0018] Figure 2 is a three-dimensional structure diagram of the partial structure of the present invention.

[0019] Figure 3 is a three-dimensional structure diagram of the fixed disk and the transmission disk of the present invention.

[0020] Figure 4 is a cross-sectional view of the hexagonal nut and the transmission disk of the present invention.

[0021] Figure 5 is a three-dimensional structure diagram of the driving mechanism of the present invention.

[0022] Figure 6 is a partial three-dimensional structure diagram of the driving mechanism of the present invention.

[0023] Figure 7 is a three-dimensional structure diagram of the connecting pipe and the valve body of the present invention.

[0024] Figure 8 is Figure 7 a partial enlarged view of part A in

[0025] Figure 9 is Figure 7 a partial enlarged view of part B in

[0026] Among the reference numerals: 1 - meter body, 2 - connecting pipe, 3 - valve body, 4 - valve rod, 5 - handle, 6 - fixing plate, 61 - upper limit block, 62 - upper limit groove, 7 - transmission mechanism, 71 - support seat, 72 - threaded rod, 73 - bevel gear set, 74 - threaded sleeve, 8 - guide rod, 9 - connecting plate, 10 - bearing, 11 - hexagon nut, 12 - transmission disc, 121 - lower limit block, 122 - lower limit groove, 13 - chute, 14 - sliding ring, 15 - compression spring, 16 - limiting hole, 17 - threaded hole, 18 - limiting screw, 19 - induction component, 191 - magnetic ring, 192 - adjusting plate, 193 - Hall sensor, 194 - adjusting screw, 195 - adjusting long hole, 20 - limiting component, 201 - ratchet, 202 - electromagnet, 203 - permanent magnet, 204 - guide post, 205 - ratchet tooth, 21 - controller, 22 - driving mechanism, 221 - connecting column, 222 - connecting ring, 223 - guide groove, 224 - slider, 225 - motor, 226 - runner, 227 - compression spring, 228 - inclined plane. Specific embodiments

[0027] Reference to an embodiment herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] Embodiment 1: A pressure gauge with a protection structure, as Figures 1-6As shown in the figure, it includes a meter body 1, a connecting pipe 2, a valve body 3, a valve rod 4, a handle 5, a fixing plate 6, a transmission mechanism 7, a support seat 71, a guide rod 8, a connecting plate 9, a bearing 10, a hexagonal nut 11 and a transmission disc 12. A connecting pipe 2 is connected to the bottom of the meter body 1. The connecting pipe 2 is used to introduce the measured pressure medium into the Bourdon tube inside the meter body 1. An external thread is provided on the outer side of the lower end of the connecting pipe 2. A valve rod 4 is movably arranged on the valve body 3. One end of the valve rod 4 is connected to the valve core inside the valve body 3, and the other end is connected to the handle 5. Inner thread interfaces are provided at both the upper and lower ends of the valve body 3, so that the valve rod 4 can be connected to the connecting pipe 2 and the conveying pipeline or pressure tank of the measured medium through the inner thread interfaces. The medium enters the Bourdon tube inside the meter body 1 through the valve body 3 and the connecting pipe 2 to achieve pressure detection. By rotating the handle 5, the valve rod 4 can be driven to rotate to open or close the valve body 3. A fixing plate 6 is fixedly connected to the outer side of the middle part of the connecting pipe 2. A support seat 71 is installed at one end of the outer wall of the valve body 3 facing the handle 5. Two guide rods 8 are slidably connected to the support seat 71. The guide rods 8 penetrate through the support seat 71. A connecting plate 9 is connected to the upper end of the guide rods 8. A bearing 10 is installed at one end of the connecting plate 9 away from the guide rods 8. The inner ring of the bearing 10 is installed with a hexagonal nut 11. The interior of the hexagonal nut 11 is hollow, and this hollow part is on the same axis as the thread interface above the valve body 3. A transmission disc 12 adapted to the fixing plate 6 is installed on the top of the hexagonal nut 11. A transmission mechanism 7 is installed on the valve body 3. When the handle 5 is rotated, the rotational force of the valve rod 4 drives the hexagonal nut 11 to rise through the transmission mechanism 7, prompting the transmission disc 12 to move upward and form a connection with the fixing plate 6. When the hexagonal nut 11 is rotated, the connecting pipe 2 is driven to rotate through the cooperation of the fixing plate 6 and the transmission disc 12, so as to adjust the pre-tightening force of the threaded connection between the connecting pipe 2 and the valve body 3.

[0029] As Figure 1 shown in the figure, the transmission mechanism 7 includes a threaded rod 72, a bevel gear set 73 and a threaded sleeve 74. The threaded rod 72 is rotatably connected inside the support seat 71. The threaded rod 72 is arranged parallel to the guide rod 8. The bevel gear set 73 is composed of two bevel gears. The two bevel gears are respectively connected to the lower end of the threaded rod 72 and the outer side of the valve rod 4, and the two bevel gears are meshed with each other. A sliding hole is provided on the connecting plate 9. The threaded sleeve 74 slidably penetrates through the sliding hole. A screw for fixing the threaded sleeve 74 is threadedly connected to the connecting plate 9. An internal thread groove is provided on the inner side of the threaded sleeve 74. The threaded rod 72 is located inside the internal thread groove. The threaded rod 72 is threadedly connected to the threaded sleeve 74 through the thread groove. When the valve rod 4 is rotated, the threaded rod 72 is driven to rotate through the two bevel gears. The threaded rod 72 drives the threaded sleeve 74 to move. The guide rod 8 ensures that the threaded sleeve 74 can move smoothly along the axial direction of the threaded rod 72. The initial height of the connecting plate 9 can be adjusted according to the actual situation. When adjusting, loosen the screw, and the threaded sleeve 74 can be slid to move in the sliding hole. After adjustment, tighten the screw.

[0030] As Figure 3As shown, upper limit blocks 61 and upper limit grooves 62 are provided at intervals at the bottom of the fixed disk 6, and lower limit blocks 121 and lower limit grooves 122 are provided at intervals at the top of the transmission disk 12. The upper limit blocks 61 and the lower limit grooves 122 are respectively adapted to the lower limit grooves 122 and the lower limit blocks 121. When the transmission disk 12 contacts the fixed disk 6, their complementary limit blocks and limit grooves achieve synchronous rotation through precise cooperation, effectively preventing connection failure problems caused by offset, slipping or loosening during the transmission process.

[0031] As Figure 4 shown, it further includes a sliding ring 14 and a compression spring 15. An annular sliding groove 13 is formed at the top of the hexagon nut 11. The sliding ring 14 is slidably connected in the sliding groove 13. The upper end of the sliding ring 14 is fixedly connected to the transmission disk 12. The compression spring 15 is located in the sliding groove 13 below the sliding ring 14. Both ends of the compression spring 15 are respectively connected to the lower end of the sliding ring 14 and the inner bottom of the sliding groove 13. When the transmission disk 12 moves upward and the limit blocks and limit grooves are not aligned, the transmission disk 12 continues to move upward and compress the compression spring 15. At this time, the compression spring 15 continuously pushes the sliding ring 14 and the transmission disk 12 connected thereto upward through its pre-tightening force, ensuring a stable contact pressure between the transmission disk 12 and the fixed disk 6. Once the hexagon nut 11 rotates to the position where the limit blocks and limit grooves are aligned, the restoring force of the compression spring 15 will push the transmission disk 12 upward, enabling the limit blocks to accurately insert into the limit grooves, thereby achieving synchronous rotation and preventing offset, slipping or loosening.

[0032] As Figure 4 shown, it further includes a limit screw 18. Limit holes 16 are symmetrically formed on both sides of the sliding ring 14. Threaded holes 17 are symmetrically provided on both sides of the upper part of the hexagon nut 11. The limit screw 18 is provided in the threaded hole 17. The two limit screws 18 on both sides respectively penetrate into the two limit holes 16 to limit the sliding ring 14 and prevent the sliding ring 14 from sliding out from the top of the sliding groove 13. The end part of the limit screw 18 adopts an internal hexagon head design, and this head is completely embedded in the surface of the hexagon nut 11. When the operator needs to rotate the hexagon nut 11, when using a wrench to rotate the hexagon nut 11, the tool can accurately fit the hexagonal outer contour of the hexagon nut 11 to apply force, avoiding fitting interference or operation jamming caused by the protrusion of the head of the limit screw 18.

[0033] As Figure 1 、 Figure 5 and Figure 6As shown in the figure, it further includes a driving mechanism 22. The driving mechanism 22 includes a connecting column 221, a connecting ring 222, a slider 224, a motor 225, a runner 226 and a compression spring 227. Three connecting columns 221 are circumferentially and spacedly connected to the outer circumference of the bearing 10. The lower end of the connecting column 221 is connected to a connecting ring 222. Three guide grooves 223 are circumferentially and spacedly formed in the connecting ring 222. A slider 224 is slidably connected in each guide groove 223. A motor 225 is installed on the top of the slider 224. The output shaft of the motor 225 penetrates through the slider 224 and is connected to a runner 226. An inclined surface 228 is provided on the outer side of the upper part of the runner 226. When the connecting pipe 2 is fitted with the threaded hole 17 of the valve body 3 from top to bottom, the lower end of the connecting pipe 2 presses against the inclined surface 228 of the upper part of the runner 226, causing the runner 226 to move away from the center of the connecting ring 222. The slider 224 moves to compress the compression spring 227. At this time, the surfaces of the three runners 226 are all in close contact with the connecting pipe 2. When the connecting pipe 2 is loosened, the motor 225 is started to drive the runner 226 to rotate. The rotation of the runner 226 drives the connecting pipe 2 to rotate, and the loosened connecting pipe 2 can be screwed out of the valve body 3, or the connecting pipe 2 to be connected can be screwed into the valve body 3. There is no need for manual rotation, which improves work efficiency and reduces labor intensity.

[0034] When using this pressure gauge, connect the valve body 3 to the medium conveying pipeline or pressure tank through the internal thread interface at the bottom. When installing the gauge body 1, close the valve core of the valve body 3. At this time, the transmission disc 12 is far away from the valve body 3. Pass the connecting pipe 2 through the hollow part of the hexagonal nut 11 from top to bottom. The external thread at the lower end of the connecting pipe 2 is located in the internal thread interface above the valve body 3. Start the motor 225 to drive the runner 226 to rotate clockwise. The rotation of the runner 226 drives the connecting pipe 2 to rotate through friction. The rotation of the connecting pipe 2 quickly forms a connection with the valve body 3 through thread fit. The fixed disc 6 moves downward to contact the transmission disc 12. When the ends of the upper limit block 61 and the lower limit block 121 come into contact, the fixed disc 6 continues to rotate and move downward. When the fixed disc 6 moves downward, the compression spring 15 is compressed and the sliding ring 14 moves downward. When the fixed disc 6 rotates so that the lower limit block 121 aligns with the upper limit groove 62 and the upper limit block 61 aligns with the lower limit groove 122, the compression spring 15 drives the sliding ring 14 and the transmission disc 12 to move upward. The lower limit block 121 also moves upward and inserts into the upper limit groove 62. At this time, the upper limit block 61 also inserts into the lower limit groove 122. Since the runner 226 is in contact connection with the connecting pipe 2 and cannot apply enough torque to the connecting pipe 2, the connecting pipe 2 and the valve body 3 cannot be fully tightened, and the medium is likely to leak. At this time, clamp the wrench on the outside of the hexagonal nut 11 and rotate the wrench to drive the hexagonal nut 11 to rotate. Drive the connecting pipe 2 to rotate through the transmission disc 12 and the fixed disc 6. The connecting pipe 2 continues to move downward, so that the connecting pipe 2 can be tightened. Before the connecting pipe 2 is fully tightened, neither the upper limit block 61 nor the lower limit block 121 is fully inserted into the lower limit groove 122 and the upper limit groove 62. Therefore, the connecting pipe 2 still has room to move downward. When the connection is completed, manually rotate the handle 5 to drive the valve core to open through the valve stem 4. At this time, drive the threaded rod 72 to rotate through the bevel gear set 73. The rotation of the threaded rod 72 drives the threaded sleeve 74, the connecting plate 9 and the hexagonal nut 11 to move downward. The fixed disc 6 is separated from the transmission disc 12. Therefore, when the valve core is opened, turning the hexagonal nut 11 with a wrench cannot drive the connecting pipe 2 to rotate. And because the connecting pipe 2 is fully tightened, if the motor 225 is started, the torque of the rotation of the runner 226 is not enough to drive the connecting pipe 2. And even if the torque of the motor is sufficient, since the runner 226 is not in frictional contact with the connecting pipe 2, the connecting pipe 2 cannot be driven to rotate only by friction.When it is necessary to disassemble the watch body 1, rotate the handle 5 in the reverse direction to drive the valve core to close through the valve stem 4. During the rotation of the valve stem 4, the threaded rod 72 is driven to rotate through the bevel gear set 73, and the threaded sleeve 74 moves upward. The connecting plate 9, the hexagon nut 11 and the transmission disc 12 move upward. After the end of the lower limit block 121 contacts the upper limit block 61, the upper limit block 61 is blocked and cannot continue to move upward. At this time, the compression spring 15 is compressed, and the valve core is completely closed. Then use a wrench to rotate the hexagon nut 11. When the lower limit block 121 is aligned with the upper limit groove 62 and the upper limit block 61 is aligned with the lower limit groove 122, the transmission disc 12 is driven to be connected to the fixed disc 6 under the action of the compression spring 15. The rotation of the hexagon nut 11 can loosen the connecting pipe 2. When the fixed disc 6 moves upward and disengages from the transmission disc 12, start the motor 225 to rotate counterclockwise to drive the runner 226 to rotate, and the connecting pipe 2 is completely screwed out of the valve body 3 through the runner 226.

[0035] Embodiment 2: On the basis of Embodiment 1, as Figures 7-9 shown, it further includes an induction component 19, a limit component 20 and a controller 21. The induction component 19 is provided on the valve body 3 and the connecting pipe 2, the limit component 20 is provided on the valve stem 4 and the valve body 3, and the controller 21 is installed on the valve body 3. When the connecting pipe 2 deviates from its originally tightly connected position with the valve body 3, the induction component 19 senses this signal and feeds the signal back to the controller 21. The controller 21 controls the limit component 20 to work, thereby restricting the valve stem 4 from rotating in the direction of opening the valve core. The induction component 19 and the limit component 20 are both electrically connected to the controller 21.

[0036] As Figure 7 and Figure 8As shown in the figure, the induction component 19 includes a magnetic ring 191, an adjustment plate 192, a Hall sensor 193, and an adjustment screw 194. The magnetic ring 191 is embedded and connected to the outer side of the lower part of the connecting pipe 2. The Hall sensor 193 is installed at the upper end of the adjustment plate 192. The Hall sensor 193 is located on one side of the magnetic ring 191. The adjustment plate 192 is provided with an adjustment long hole 195 in the vertical direction. The upper part of the valve body 3 is threadedly connected with an adjustment screw 194. The adjustment screw 194 passes through the adjustment long hole 195, so that the adjustment plate 192 can adjust its position in the vertical direction, and the position of the adjustment plate 192 is fixed by tightening the adjustment screw 194. The Hall sensor 193 is used to monitor the position change of the magnetic ring 191. The Hall sensor 193 is electrically connected to the controller 21. When the connecting pipe 2 and the valve body 3 are in a completely sealed state, if the position of the magnetic ring 191 sensed by the Hall sensor 193 deviates, the adjustment screw 194 can be loosened, and the adjustment plate 192 can be pulled up and down to adjust the height position of the Hall sensor 193 until the position of the magnetic ring 191 sensed by the Hall sensor 193 is in a normal state, and then the adjustment screw 194 is tightened to fix the position of the adjustment plate 192. When the position of the magnetic ring 191 sensed by the Hall sensor 193 deviates, a signal is fed back to the controller 21, and the controller 21 controls the limit component 20 to restrict the valve stem 4, so that the valve stem 4 cannot rotate in the direction of opening the valve core. When the position of the magnetic ring 191 sensed by the Hall sensor 193 is in a normal state, a signal is fed back to the controller 21, and the controller 21 controls the limit component 20 to reset, so that the valve stem 4 is in a state where it can open or close the valve core.

[0037] As Figure 7 and Figure 9 As shown in the figure, the limit component 20 includes a ratchet 201, an electromagnet 202, a permanent magnet 203, a guide post 204, and a ratchet tooth 205. The ratchet 201 is connected to the outer side of the valve stem 4. The electromagnet 202 is connected to the valve body 3 below the ratchet 201. The two sides of the electromagnet 202 are slidably connected with the guide posts 204. A permanent magnet 203 is provided above the electromagnet 202. The permanent magnet 203 is connected to the upper end of the guide post 204. A ratchet tooth 205 adapted to the ratchet 201 is provided at the top of the permanent magnet 203. The electromagnet 202 is electrically connected to the controller 21. When the position of the magnetic ring 191 sensed by the Hall sensor 193 deviates, a signal is fed back to the controller 21, and the controller 21 controls the electromagnet 202 to be energized. After the electromagnet 202 is energized, it generates a magnetic force with the same pole as the permanent magnet 203. Due to the principle of like poles repelling each other, after the electromagnet 202 is energized, it will drive the permanent magnet 203 and the ratchet tooth 205 thereon to move upward. The ratchet tooth 205 meshes with the ratchet 201, so that the valve stem 4 cannot rotate in the direction of opening the valve core. When the position of the magnetic ring 191 sensed by the Hall sensor 193 corresponds, a signal is fed back to the controller 21, and the controller 21 controls the electromagnet 202 to be de-energized. The permanent magnet 203 drives the ratchet tooth 205 to reset downward under the action of gravity, so that the valve stem 4 can open or close the valve core.

[0038] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A pressure gauge with a protective structure, comprising a gauge body (1), a connecting pipe (2), a valve body (3), a valve stem (4) and a handle (5), wherein the bottom of the gauge body (1) is connected to the connecting pipe (2), the valve body (3) is provided with a valve stem (4), and the valve stem (4) is connected to the handle (5), characterized in that: The valve body (3) further comprises a fixing plate (6), a transmission mechanism (7), a support seat (71), a guide rod (8), a connecting plate (9), a bearing (10), a hexagonal nut (11) and a transmission plate (12). The fixing plate (6) is provided on the connecting pipe (2). A support seat (71) is installed on one side of the valve body (3). The guide rod (8) is slidably connected to the support seat (71). The connecting plate (9) is connected to the guide rod (8). A bearing (10) is installed on the end of the connecting plate (9) away from the guide rod (8). The hexagonal nut (11) is installed on the bearing (10). The hexagonal nut A transmission disc (12) adapted to the fixed disc (6) is installed on the top of the valve body (3). A transmission mechanism (7) is installed on the valve body (3). When the handle (5) is turned to close the valve body (3), the rotational force of the valve stem (4) drives the hexagonal nut (11) to rise through the transmission mechanism (7), causing the transmission disc (12) to move upward and form a connection with the fixed disc (6). When the hexagonal nut (11) is turned, the connection pipe (2) is driven to rotate through the synergistic action of the fixed disc (6) and the transmission disc (12), thereby adjusting the preload force of the threaded connection between the connection pipe (2) and the valve body (3).

2. A pressure gauge with a protective structure as claimed in claim 1, characterized in that: The transmission mechanism (7) comprises a threaded rod (72), a bevel gear set (73) and a threaded sleeve (74); the threaded rod (72) is rotatably connected inside the support seat (71); the threaded rod (72) and the valve stem (4) are transmission-connected via the bevel gear set (73); the threaded sleeve (74) is connected to the connecting plate (9); and the threaded rod (72) and the threaded sleeve (74) are threadedly connected.

3. A pressure gauge with a protective structure as claimed in claim 2, characterized in that: An upper limit block (61) and an upper limit slot (62) are provided at the bottom of the fixed disk (6), and a lower limit block (121) and a lower limit slot (122) are provided at the top of the transmission disk (12), and the upper limit block (61) and the lower limit slot (122) are respectively adapted to the lower limit slot (122) and the lower limit block (121).

4. A pressure gauge with a protective structure as claimed in claim 3, characterized in that: It also includes a sliding ring (14) and a compression spring (15). The top of the hexagonal nut (11) is slidably connected to the sliding ring (14). The upper end of the sliding ring (14) is fixedly connected to the transmission plate (12). The two ends of the compression spring (15) are respectively connected to the sliding ring (14) and the hexagonal nut (11).

5. A pressure gauge with a protective structure as claimed in claim 4, characterized in that: It also includes a limit screw (18), a limit hole (16) is symmetrically provided on both sides of the sliding ring (14), and a limit screw (18) is symmetrically provided on both sides of the upper part of the hexagonal nut (11), and the limit screws (18) on both sides are respectively inserted into the two limit holes (16).

6. A pressure gauge with a protective structure as claimed in claim 5, characterized in that: The bearing (10) further comprises a driving mechanism (22), wherein the driving mechanism (22) comprises a connecting column (221), a connecting ring (222), a slider (224), a motor (225), a rotating wheel (226) and a compression spring (227), wherein at least three connecting columns (221) are connected to the outer ring of the bearing (10) at intervals in the circumferential direction, the lower end of the connecting column (221) is connected to the connecting ring (222), the connecting ring (222) is provided with at least three guide grooves (223) at intervals in the circumferential direction, each guide groove (223) is slidably connected to a slider (224), a motor (225) is mounted on the top of the slider (224), and the output shaft of the motor (225) is connected to the rotating wheel (226).

7. A pressure gauge with a protective structure as claimed in claim 6, characterized in that: The valve body (3) and the connecting pipe (2) are provided with the sensing component (19), the limiting component (20) and the controller (21); the valve body (3) and the connecting pipe (2) are provided with the sensing component (19); the valve stem (4) and the valve body (3) are provided with the limiting component (20); the controller (21) is installed on the valve body (3); and the sensing component (19) and the limiting component (20) are both electrically connected to the controller (21).

8. A pressure gauge with a protective structure as claimed in claim 7, characterized in that: The sensing component (19) comprises a magnetic ring (191), an adjustment plate (192) and a Hall sensor (193); the magnetic ring (191) is connected to the outer side of the lower part of the connecting pipe (2); the adjustment plate (192) is connected to the valve body (3); the Hall sensor (193) is installed on the upper end of the adjustment plate (192); the Hall sensor (193) is located on one side of the magnetic ring (191); and the Hall sensor (193) is electrically connected to the controller (21).

9. A pressure gauge with a protective structure as claimed in claim 8, characterized in that: The limit assembly (20) comprises a ratchet (201), an electromagnet (202), a permanent magnet (203) and a ratchet (205); the ratchet (201) is connected to the outside of the valve stem (4); the electromagnet (202) is connected to the valve body (3) below the ratchet (201); a permanent magnet (203) slidably connected to the electromagnet (202) is provided above the electromagnet (202); a ratchet (205) adapted to the ratchet (201) is provided on the top of the permanent magnet (203); and the electromagnet (202) is electrically connected to the controller (21).

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