Pressure gauge with protective structure

Abstract

This invention relates to a pressure gauge, and more particularly to a pressure gauge with a protective structure. It includes a gauge body, a connecting pipe, a valve body, a valve stem, a handle, a fixed plate, a transmission mechanism, a support base, and a guide rod. The connecting pipe is connected to the bottom of the gauge body. The valve stem is mounted on the valve body and connected to the handle. The fixed plate is mounted on the connecting pipe. A support base is mounted on one side of the valve body. A guide rod is slidably connected to the support base. A connecting plate is connected to the guide rod. A bearing is mounted on the end of the connecting plate away from the guide rod. A hexagonal nut is mounted on the bearing. A transmission plate adapted to the fixed plate is mounted on the top of the hexagonal nut. When the valve core of the valve body is closed, the hexagonal nut moves upward. The transmission plate cooperates with the fixed plate, and rotating the hexagonal nut drives the connecting pipe to disassemble. Therefore, the gauge body and connecting pipe can only be disassembled when the valve is closed, avoiding the problem of medium leakage caused by directly disassembling the pressure gauge without closing the valve, thus ensuring safety.

Description

Technical Field

[0001] This invention relates to a pressure gauge, and more particularly to a pressure gauge with a protective structure. Background Technology

[0002] Pressure gauges are widely used as an important measuring tool for monitoring the pressure of various fluid media in industrial production and daily life. However, in harsh working environments, such as high temperature, high pressure, and corrosive gases or liquids, traditional pressure gauges are easily damaged due to limitations in their structure and materials. Once a pressure gauge malfunctions or is damaged, it not only affects normal production activities but may also threaten the safe operation of the entire system. In such cases, it is usually necessary to replace the damaged pressure gauge immediately to restore normal system operation.

[0003] When replacing pressure gauges, if the relevant valves are left open before removing the gauge, media leakage may occur, leading to a series of safety hazards, including but not limited to environmental pollution, equipment damage, and personal injury. Although theoretically, valves can be immediately closed upon discovery, in practice, especially when valves have been exposed to harsh environments for extended periods and have corroded, they may fail to close properly. In such cases, not only will the response be delayed, increasing the risk of hazardous material leakage, but improper handling could also cause more serious safety accidents. Summary of the Invention

[0004] To overcome the drawback that if the relevant valves are not closed before the pressure gauge is disassembled during pressure gauge replacement, which may lead to media leakage and a series of safety hazards, this 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 stem, a handle, a fixed plate, a transmission mechanism, a support base, a guide rod, a connecting plate, a bearing, a hexagonal nut, and a transmission disc. The connecting pipe is connected to the bottom of the gauge body. The valve stem is mounted on the valve body and connected to the handle. The fixed plate is mounted on the connecting pipe. A support base is mounted on one side of the valve body. A guide rod is slidably connected to the support base. A connecting plate is connected to the guide rod. A bearing is mounted on the end of the connecting plate away from the guide rod. A hexagonal nut is mounted on the bearing. A transmission disc adapted to the fixed plate is mounted on the top of the hexagonal nut. The transmission mechanism is mounted on the valve body. When the handle is turned to close the valve body, the rotational force of the valve stem drives the hexagonal nut to rise through the transmission mechanism, causing the transmission disc to move upward and connect with the fixed plate. When the hexagonal nut is turned, the connecting pipe rotates through the synergistic action of the fixed plate and the transmission disc, thereby adjusting the preload of the threaded connection between the connecting pipe and the valve body.

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

[0007] As a further preferred option, the bottom of the fixed plate is provided with an upper limit block and an upper limit groove, and the top of the transmission plate is provided with a lower limit block and a lower limit groove. The upper limit block and the lower limit groove are adapted to each other.

[0008] As a further preferred option, it also includes a sliding ring and a compression spring. The top of the hexagonal nut is slidably connected to the sliding ring, the upper end of the sliding ring is fixed to the transmission disc, and the two ends of the compression spring are respectively connected to the sliding ring and the hexagonal nut.

[0009] As a further preferred option, it also includes limiting screws, with limiting holes symmetrically opened on both sides of the sliding ring, and limiting screws symmetrically provided on both sides of the upper part of the hexagonal nut, with the limiting screws on both sides passing into the two limiting holes respectively.

[0010] As a further preferred embodiment, a drive mechanism is also included. The drive mechanism includes connecting columns, connecting rings, sliders, motors, rotating wheels, and compression springs. At least three connecting columns are circumferentially spaced on the outer ring of the bearing. A connecting ring is connected to the lower end of each connecting column. At least three guide grooves are circumferentially spaced on the connecting ring. A slider is slidably connected in each guide groove. A motor is installed on the top of the slider. The output shaft of the motor is connected to a rotating wheel.

[0011] As a further preferred embodiment, it also includes a sensing component, a limiting component, and a controller. The sensing component is provided on the valve body and the connecting pipe, the limiting component is provided on the valve stem and the valve body, and the controller is mounted on the valve body. The sensing component and the limiting component are both electrically connected to the controller.

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

[0013] As a further preferred embodiment, the limiting assembly includes a ratchet, an electromagnet, a permanent magnet, and ratchet teeth. The ratchet is connected to the outside of the valve stem, the electromagnet is connected to the valve body below the ratchet, the permanent magnet is slidably connected to the electromagnet above it, and the ratchet teeth adapted to the ratchet are provided on the top of the permanent magnet. The electromagnet is electrically connected to the controller.

[0014] This invention has the following advantages: 1. When the handle is turned, the valve stem rotates and drives the hexagonal nut to move through the transmission mechanism. When the valve core of the valve body is opened, the hexagonal nut moves downward, and the fixed plate disengages from the transmission plate. Rotating the hexagonal nut cannot drive the fixed plate 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 gauge cannot be disassembled. When the valve core of the valve body is closed, the hexagonal nut moves upward, and the transmission plate cooperates with the fixed plate. Rotating the hexagonal nut drives the connecting pipe to be disassembled. Therefore, the gauge body and connecting pipe can only be disassembled when the valve is closed, avoiding the problem of medium leakage caused by directly disassembling the pressure gauge due to forgetting to close the valve, thus ensuring safety.

[0015] 2. This invention, through sensing components and a controller, can automatically limit the opening action of the valve stem when a misalignment between the connecting pipe and the valve body is detected, resulting in a sealing failure. This ensures that the medium flow has been safely cut off before any disassembly operation is performed, 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 of the connecting pipe can be completed manually by the drive mechanism, which reduces the risk of workers being exposed to potentially hazardous environments and also improves work efficiency. Attached Figure Description

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

[0018] Figure 2 This is a three-dimensional structural diagram of a portion of the present invention.

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

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

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

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

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

[0024] Figure 8 for Figure 7 A magnified view of a portion of point A in the middle.

[0025] Figure 9 for Figure 7 A magnified view of a section at point B in the middle.

[0026] In the attached diagram, the following are the reference numerals: 1_dial body, 2_connecting pipe, 3_valve body, 4_valve stem, 5_handle, 6_fixed disc, 61_upper limit block, 62_upper limit groove, 7_transmission mechanism, 71_support base, 72_threaded rod, 73_bevel gear set, 74_threaded sleeve, 8_guide rod, 9_connecting plate, 10_bearing, 11_hexagonal nut, 12_transmission disc, 121_lower limit block, 122_lower limit groove, 13_sliding groove, 14_sliding ring, 15_compression spring, 16_limiting hole, 17_threaded hole. 18_Limit screw, 19_Sensing component, 191_Magnetic ring, 192_Adjusting plate, 193_Hall sensor, 194_Adjusting screw, 195_Adjusting elongated hole, 20_Limit component, 201_Ratchet, 202_Electromagnet, 203_Permanent magnet, 204_Guide post, 205_Ratchet, 21_Controller, 22_Drive mechanism, 221_Connecting post, 222_Connecting ring, 223_Guide groove, 224_Slider, 225_Motor, 226_Rotating wheel, 227_Compression spring, 228_Inclined surface. Detailed Implementation

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

[0028] Example 1: A pressure gauge with a protective structure, such as Figures 1-6As shown, the device includes a gauge body 1, a connecting pipe 2, a valve body 3, a valve stem 4, a handle 5, a fixed plate 6, a transmission mechanism 7, a support base 71, a guide rod 8, a connecting plate 9, a bearing 10, a hexagonal nut 11, and a transmission plate 12. The bottom of the gauge body 1 is connected to the connecting pipe 2, which is used to introduce the medium to be measured into the Bourdon tube inside the gauge body 1. The lower end of the connecting pipe 2 has an external thread. The valve body 3 has a movable valve stem 4, one end of which is connected to the valve core inside the valve body 3, and the other end is connected to the handle 5. Both the upper and lower ends of the valve body 3 have internal thread interfaces, allowing the valve stem 4 to connect to the connecting pipe 2 and the pipeline or pressure tank for the medium being measured through the internal thread interfaces. The medium enters the Bourdon tube inside the gauge body 1 through the valve body 3 and the connecting pipe 2 to achieve pressure detection. Rotating the handle 5 can rotate the valve stem 4, opening or closing the valve body 3. A fixed plate 6 is fixedly connected to the outer side of the middle part of the connecting pipe 2. A support seat 71 is installed on 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 pass 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 on the end of the connecting plate 9 away from the guide rods 8. A hexagonal nut 11 is installed on the inner ring of the bearing 10. The hexagonal nut 11 is hollow inside. The hollow part inside is on the same axis as the threaded interface on the top of the valve body 3. A transmission plate 12 adapted to the fixed 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 turned, the rotational force of the valve stem 4 drives the hexagonal nut 11 to rise through the transmission mechanism 7, causing the transmission plate 12 to move upward and connect with the fixed plate 6. When the hexagonal nut 11 is turned, the connecting pipe 2 is driven to rotate through the synergistic action of the fixed plate 6 and the transmission plate 12, thereby adjusting the preload of the threaded connection between the connecting pipe 2 and the valve body 3.

[0029] like Figure 1 As 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 base 71. The threaded rod 72 is arranged parallel to the guide rod 8. The bevel gear set 73 consists of two bevel gear sets 73, which are respectively connected to the lower end of the threaded rod 72 and the outside of the valve stem 4. The two bevel gears mesh with each other. A sliding hole is provided on the connecting plate 9, through which the threaded sleeve 74 slides. A screw for fixing the threaded sleeve 74 is threaded onto the connecting plate 9. The inner side is provided with an internal thread groove, and the threaded rod 72 is located in 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 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 slide and move in the sliding hole. After adjustment, tighten the screw.

[0030] like Figure 3As shown, the bottom of the fixed disk 6 is provided with an upper limit block 61 and an upper limit groove 62 spaced apart, and the top of the transmission disk 12 is provided with a lower limit block 121 and a lower limit groove 122 spaced apart. The upper limit block 61 is adapted to the lower limit groove 122, and the lower limit block 121 is adapted to the upper limit groove 62. When the transmission disk 12 contacts the fixed disk 6, its complementary limit blocks and limit grooves achieve synchronous rotation through precise cooperation, thereby effectively preventing connection failure caused by offset, slippage or loosening during transmission.

[0031] like Figure 4 As shown, it also includes a sliding ring 14 and a compression spring 15. The top of the hexagonal nut 11 has an annular groove 13, and the sliding ring 14 is slidably connected in the groove 13. The upper end of the sliding ring 14 is fixed to the transmission disk 12. The compression spring 15 is located in the groove 13 below the sliding ring 14. The two ends of the compression spring 15 are respectively connected to the lower end of the sliding ring 14 and the bottom of the groove 13. When the transmission disk 12 moves upward and the limiting block is not aligned with the limiting groove, the transmission disk 12 continues to move upward and compresses the spring 15. At this time, the compression spring 15 continuously pushes the sliding ring 14 and the transmission disk 12 connected to it upward through its preload, ensuring that the transmission disk 12 and the fixed disk 6 maintain a stable contact pressure. Once the hexagonal nut 11 rotates to the position where the limiting block and the limiting groove are aligned, the restoring force of the compression spring 15 will push the transmission disk 12 upward, so that the limiting block can be accurately inserted into the limiting groove, thereby achieving synchronous rotation and preventing offset, slippage or loosening.

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

[0033] like Figure 1 , Figure 5 and Figure 6As shown, it also includes a drive mechanism 22, which includes a connecting column 221, a connecting ring 222, a slider 224, a motor 225, a rotating wheel 226, and a compression spring 227. Three connecting columns 221 are circumferentially spaced around the outer ring of the bearing 10. A connecting ring 222 is connected to the lower end of each connecting column 221. Three guide grooves 223 are circumferentially spaced around the connecting ring 222. A slider 224 is slidably connected to each guide groove 223. A motor 225 is mounted on the top of the slider 224. The output shaft of the motor 225 passes through the slider 224 and is connected to the rotating wheel 226. An inclined surface 228 is provided on the upper outer side of the rotating wheel 226. The connecting pipe 2... When the connecting pipe 2 is engaged 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 rotating wheel 226, causing the rotating wheel 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 rotating wheels 226 are in close contact with the connecting pipe 2. When the connecting pipe 2 is loosened, the motor 225 is started to drive the rotating wheel 226 to rotate. The rotation of the rotating wheel 226 drives the connecting pipe 2 to rotate, which can unscrew the loosened connecting pipe 2 from the valve body 3, or screw the connecting pipe 2 that is about to be connected 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 delivery pipeline or pressure tank through the internal thread interface below. When installing the gauge body 1, close the valve core of the valve body 3. At this time, the transmission disc 12 is away from the valve body 3. Insert the connecting pipe 2 from top to bottom into the hollow part of the hexagonal nut 11. 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 rotating wheel 226 to rotate clockwise. The rotation of the rotating wheel 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 engagement. The fixed disc 6 contacts the transmission disc 12 downward. When the upper limit block 61 and the lower limit block 121 contact each other, the fixed disc 6 continues to rotate and move downward. When the fixed plate 6 moves downward, the compression spring 15 is compressed, and the sliding ring 14 moves downward. When the fixed plate 6 rotates to align the lower limit block 121 with the upper limit groove 62 and the upper limit block 61 with the lower limit groove 122, the compression spring 15 drives the sliding ring 14 and the transmission plate 12 to move upward. The lower limit block 121 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 rotating wheel 226 is in contact with the connecting pipe 2, it cannot apply enough torque to the connecting pipe 2. Therefore, the connecting pipe 2 and the valve body 3 cannot be fully tightened, and the medium is prone to leakage. At this time, a wrench is used to hold the hexagonal nut 11 on the outside. Turning the wrench drives the hexagonal nut 11 to rotate. Through the transmission plate 12 and the fixed plate 6, the connecting pipe 2 is driven to rotate. The connecting pipe 2 continues to move downward, thus tightening the connecting pipe 2. Before being fully tightened, the upper limit block 61 and the lower limit block 121 are not fully inserted into the lower limit groove 122 and the upper limit groove 62, respectively. Therefore, the connecting pipe 2 still has room to move downward. After the connection is completed, the handle 5 is manually turned, which drives the valve core to open through the valve stem 4. At this time, the threaded rod 72 is driven 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 plate 6 is disengaged from the transmission plate 12. Therefore, when the valve core is open, turning the hexagonal nut 11 with a wrench will not be able to drive the connecting pipe 2 to rotate. Moreover, since the connecting pipe 2 is fully tightened, if the motor 225 is started, the torque of the rotating wheel 226 is insufficient to drive the connecting pipe 2. Even if the starting torque is sufficient, since the rotating wheel 226 does not make frictional contact with the connecting pipe 2, the connecting pipe 2 cannot be driven to rotate by friction alone.When it is necessary to disassemble the valve body 1, the handle 5 is rotated in the opposite direction to drive the valve core to close via the valve stem 4. During the rotation of the valve stem 4, the threaded rod 72 is driven to rotate via the bevel gear set 73, the threaded sleeve 74 moves upward, and the connecting plate 9, hexagonal nut 11 and transmission disc 12 move upward. After the lower limit block 121 and the upper limit block 61 come into contact, the upper limit block 61 is blocked and cannot move upward. At this time, the compression spring 15 is compressed, and the valve core is completely closed. Then, the hexagonal nut 11 is rotated with a wrench. 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 connected to the fixed disc 6 under the action of the compression spring 15. The rotation of the hexagonal nut 11 can loosen the connecting pipe 2. When the fixed disc 6 moves upward and disengages from the transmission disc 12, the motor 225 is started to rotate counterclockwise to drive the rotating wheel 226 to rotate. The rotating wheel 226 completely unscrews the connecting pipe 2 from the valve body 3.

[0035] Example 2: Based on Example 1, such as Figures 7-9 As shown, it also includes a sensing component 19, a limiting component 20, and a controller 21. The sensing component 19 is provided on the valve body 3 and the connecting pipe 2, and the limiting component 20 is provided on the valve stem 4 and the valve body 3. The controller 21 is installed on the valve body 3. When the connecting pipe 2 deviates from its original tight connection position with the valve body 3, the sensing component 19 senses this signal and feeds the signal back to the controller 21. The controller 21 controls the limiting component 20 to work, thereby limiting the valve stem 4 from rotating in the direction of opening the valve core. The sensing component 19 and the limiting component 20 are both electrically connected to the controller 21.

[0036] like Figure 7 and Figure 8As shown, the sensing assembly 19 includes a magnetic ring 191, an adjusting plate 192, a Hall sensor 193, and an adjusting screw 194. The magnetic ring 191 is embedded in the lower outer side of the connecting pipe 2. The Hall sensor 193 is mounted on the upper end of the adjusting plate 192, located on one side of the magnetic ring 191. The adjusting plate 192 has an adjusting elongated hole 195 in the vertical direction. An adjusting screw 194 is threaded onto the upper part of the valve body 3, passing through the adjusting elongated hole 195, allowing the adjusting plate 192 to be adjusted vertically. The position of the adjusting plate 192 is fixed by tightening the adjusting screw 194. The Hall sensor 193 monitors the positional change of the magnetic ring 191 and is electrically connected to the controller 21. When the connecting pipe 2 and the valve body 3 are in a fully functional state... In a fully sealed state, if the position of the Hall sensor 193 sensing magnetic ring 191 deviates, the adjusting screw 194 can be loosened, and the adjusting plate 192 can be pulled up and down to adjust the height of the Hall sensor 193 until the position of the Hall sensor 193 sensing magnetic ring 191 is in a normal state. Then, the adjusting screw 194 is tightened to fix the position of the adjusting plate 192. When the position of the Hall sensor 193 sensing magnetic ring 191 deviates, the signal is fed back to the controller 21. The controller 21 controls the limit component 20 to restrict the valve stem 4, preventing the valve stem 4 from rotating in the direction of opening the valve core. When the position of the Hall sensor 193 sensing magnetic ring 191 is in a normal state, the signal is fed back to the controller 21. The controller 21 controls the limit component 20 to reset, so that the valve stem 4 is in a state where the valve core can be opened or closed.

[0037] like Figure 7 and Figure 9 As shown, the limiting assembly 20 includes a ratchet 201, an electromagnet 202, a permanent magnet 203, a guide post 204, and ratchet teeth 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. The guide posts 204 are slidably connected to both sides of the electromagnet 202. The permanent magnet 203 is located above the electromagnet 202 and is connected to the upper end of the guide post 204. The top of the permanent magnet 203 is provided with ratchet teeth 205 that are adapted to the ratchet 201. The electromagnet 202 is electrically connected to the controller 21. When the Hall sensor 193 senses the position displacement of the magnetic ring 191, it feeds back the signal to... The controller 21 controls the electromagnet 202 to be energized. After being energized, the electromagnet 202 generates a magnetic force with the same pole as the permanent magnet 203. Due to the principle of like poles repelling each other, the electromagnet 202 will drive the permanent magnet 203 and its ratchet 205 to move upward. The ratchet 205 and the ratchet wheel 201 are engaged, preventing the valve stem 4 from rotating in the direction of opening the valve core. When the Hall sensor 193 senses the position of the magnetic ring 191, it feeds the signal back to the controller 21. The controller 21 controls the electromagnet 202 to be de-energized. Under the action of gravity, the permanent magnet 203 drives the ratchet 205 to reset downward, so that the valve stem 4 can open or close the valve core.

[0038] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection 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 the valve stem (4), and the valve stem (4) is connected to the handle (5), characterized in that: It also includes a fixed plate (6), a transmission mechanism (7), a support base (71), a guide rod (8), a connecting plate (9), a bearing (10), a hexagonal nut (11), and a transmission disc (12). The fixed plate (6) is provided on the connecting pipe (2). The support base (71) is installed on one side of the valve body (3). The guide rod (8) is slidably connected to the support base (71). The connecting plate (9) is connected to the guide rod (8). The end of the connecting plate (9) away from the guide rod (8) is equipped with a bearing (10). The hexagonal nut (11) is installed on the bearing (10). (11) A transmission disc (12) adapted to the fixed disc (6) is installed on the top. 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 up and connect with the fixed disc (6). When the hexagonal nut (11) is turned, the connecting pipe (2) is driven to rotate through the synergistic effect of the fixed disc (6) and the transmission disc (12), thereby adjusting the preload of the threaded connection between the connecting pipe (2) and the valve body (3). 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 base (71). The threaded rod (72) and the valve stem (4) are connected by transmission through the bevel gear set (73). The threaded sleeve (74) is connected on the connecting plate (9). The threaded rod (72) and the threaded sleeve (74) are threadedly connected. It also includes a drive mechanism (22), which includes a connecting column (221), a connecting ring (222), a slider (224), a motor (225), a rotating wheel (226), and a compression spring (227). It also includes a sensing component (19), a limiting component (20), and a controller (21); The sensing component (19) includes a magnetic ring (191), an adjustment plate (192), and a Hall sensor (193).

2. A pressure gauge with a protective structure as described in claim 1, characterized in that: The bottom of the fixed plate (6) is provided with an upper limit block (61) and an upper limit groove (62), and the top of the transmission plate (12) is provided with a lower limit block (121) and a lower limit groove (122). The upper limit block (61) is adapted to the lower limit groove (122), and the lower limit block (121) is adapted to the upper limit groove (62).

3. A pressure gauge with a protective structure as described in claim 2, 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 fixed to the transmission disc (12). The two ends of the compression spring (15) are respectively connected to the sliding ring (14) and the hexagonal nut (11).

4. A pressure gauge with a protective structure as described in claim 3, characterized in that: It also includes a limiting screw (18), and the sliding ring (14) has symmetrical limiting holes (16) on both sides. The upper part of the hexagonal nut (11) is symmetrically provided with limiting screws (18) on both sides, and the two limiting screws (18) are respectively inserted into the two limiting holes (16).

5. A pressure gauge with a protective structure as described in claim 4, characterized in that: The outer ring of the bearing (10) is circumferentially connected with at least three connecting columns (221), and the lower end of the connecting column (221) is connected with a connecting ring (222). The connecting ring (222) is circumferentially provided with at least three guide grooves (223). Each guide groove (223) is slidably connected with a slider (224). A motor (225) is installed on the top of the slider (224), and the output shaft of the motor (225) is connected to a rotating wheel (226).

6. A pressure gauge with a protective structure as described in claim 5, characterized in that: The valve body (3) and the connecting pipe (2) are provided with sensing components (19), the valve stem (4) and the valve body (3) are provided with limiting components (20), and the controller (21) is installed on the valve body (3). The sensing components (19) and the limiting components (20) are electrically connected to the controller (21).

7. A pressure gauge with a protective structure as described in claim 6, characterized in that: A magnetic ring (191) is connected to the lower outer side of the connecting pipe (2). The adjusting plate (192) is connected to the valve body (3). A Hall sensor (193) is installed on the upper end of the adjusting plate (192). The Hall sensor (193) is located on one side of the magnetic ring (191). The Hall sensor (193) is electrically connected to the controller (21).

8. A pressure gauge with a protective structure as described in claim 7, characterized in that: The limiting assembly (20) includes a ratchet (201), an electromagnet (202), a permanent magnet (203), and a ratchet tooth (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). The permanent magnet (203) is slidably connected to the electromagnet (202) above it. The ratchet tooth (205) adapted to the ratchet (201) is provided on the top of the permanent magnet (203). The electromagnet (202) is electrically connected to the controller (21).

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