Shockproof pressure gauge

Abstract

The present application relates to pressure gauge technical field, specifically disclose a kind of shockproof pressure gauge. Including gauge body, pointer and dial are equipped in gauge body, inside is filled with damping liquid, pointer includes pointer main body and deflection part, pointer main body front end is equipped with shaft hole, deflection part rear end center is fixed with deflection shaft, deflection shaft rear end is fixed with elastic strip;Elastic strip is inserted into shaft hole, the rear end of elastic strip is fixed by a locking mechanism;Deflection shaft is inserted into shaft hole, both rotary sliding fit;Deflection part is equipped with a inclined wall respectively along width direction opposite ends, the inclined direction of two inclined walls is consistent. When gauge body is weakly vibrated, deflection part remains in initial position, additional damping effect is not generated to pointer, in addition, damping liquid can use lower viscosity, so that the present shockproof pressure gauge has higher measuring accuracy and response speed. When gauge body is strongly vibrated, deflection part will be deflected, damping effect is exerted to pointer, to improve shockproof performance, prolong service life.

Description

Technical Field

[0001] This invention relates to the field of pressure gauge technology, and more particularly to a shock-resistant pressure gauge. Background Technology

[0002] Shock-resistant pressure gauges, filled with damping fluid (such as silicone oil or glycerin), effectively absorb mechanical vibration energy, reducing the impact of medium pulsation, impact, or sudden unloading on the instrument. This ensures stable operation even in environments with strong vibrations or drastic pressure fluctuations, making them widely applicable. Currently, the shock resistance of a pressure gauge primarily depends on the viscosity of the damping fluid. High-viscosity damping fluids can more effectively absorb vibration energy, suppressing high-frequency pointer fluctuations and achieving better shock resistance, but this also introduces several drawbacks. Firstly, the internal components operate under high damping conditions for extended periods, accelerating mechanical wear and fatigue, and affecting service life. Secondly, increased fluid resistance prevents the pointer from reflecting pressure changes in real time, resulting in significant dynamic hysteresis and substantial errors in pointer oscillation, significantly reducing measurement accuracy. Furthermore, the expansion coefficient of the damping fluid increases with viscosity, and temperature changes in the working environment can easily cause internal pressure imbalances, affecting the stability of the pressure gauge's performance. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a shock-resistant pressure gauge with a deflection part on the pointer, which can automatically adjust the damping state according to the vibration conditions, thereby improving shock resistance, reducing the requirements for damping fluid viscosity, and avoiding wear and fatigue acceleration caused by the continuous operation of internal components in a high-damping state for a long time.

[0004] To achieve the above technical objectives, the present invention adopts the following technical solution:

[0005] A shock-resistant pressure gauge includes a gauge body, a pointer, and a dial, the gauge body being filled with damping fluid. The pointer includes a pointer body and a deflecting part, the pointer body being fixedly connected to a pointer shaft mounted at the center of the dial. The pointer body has a shaft hole extending along its length at its front end, and a locking mechanism is provided on the pointer body. The deflecting part and the pointer body extend in the same direction, and a rearward-extending deflecting shaft is fixed at the center of the rear end of the deflecting part. A rearward-extending elastic strip is fixed at the rear end of the deflecting shaft. The elastic strip passes through the shaft hole, and its rear end is fixed by the locking mechanism. The deflecting shaft is inserted into the shaft hole, and the two parts are in a rotating sliding fit. The deflecting part has an inclined wall at each of its two opposite ends along its width direction, and the two inclined walls are in the same direction. When the deflecting part is in its initial position, the width directions of the deflecting part and the pointer body are the same. When the pointer moves, the deflecting part, driven by the reaction force of the damping fluid, can deflect along the deflecting shaft; the larger the deflection angle, the greater the resistance to movement of the deflecting part in the damping fluid.

[0006] In a preferred embodiment, the deflection portion gradually narrows in width from back to front, making the front end of the deflection portion a pointed tip.

[0007] In a preferred embodiment, the deflection part, the deflection shaft and the elastic strip are integrated into one structure and made of the same elastic metal material, and the elastic strip is in the shape of a flat strip.

[0008] In a preferred embodiment, a slot is provided at the bottom of the shaft hole, and the locking mechanism is a clamping bolt located on one side of the slot. The rear end of the elastic strip is inserted into the slot and clamped and fixed by the clamping bolt.

[0009] In a preferred embodiment, the centerlines of the deflection axis and the pointer axis intersect perpendicularly, and the center of the front end face of the deflection part is located on the centerline of the deflection axis.

[0010] In a preferred embodiment, a limiting protrusion is provided on the front end surface of the pointer body. After the deflection part returns from the deflection state to the initial position, it just abuts against the limiting protrusion, and thus cannot continue to rotate in the original direction. The elastic strip can drive the deflection part to abut against the limiting protrusion.

[0011] In a preferred embodiment, the upper side of the gauge body has an injection hole, and a leak-proof vent valve is installed on the injection hole; the leak-proof vent valve includes a valve sleeve, a valve cover, a pressure rod, a plug plate, and a liquid-absorbing expansion body; the valve sleeve is sealed to the injection hole, has a closed bottom structure, and has side holes on its side walls; the liquid-absorbing expansion body is placed in the inner cavity of the valve sleeve, above the surface of the damping fluid; the valve cover is sealed and fixed to the upper end of the valve sleeve, and has a central hole; the pressure rod passes through the central hole, and the two slide together with a clearance that allows the inner cavity of the valve sleeve to communicate with the outside; the plug plate is fixed to the lower end of the pressure rod, and the plug plate is located above the liquid-absorbing expansion body;

[0012] Furthermore, the upper end of the pressure rod is provided with a pressing part; the valve sleeve and the injection hole are connected by threads; a sealing gasket is fixed on the upper side of the plug plate; and the liquid-absorbing expansion body is a synthetic sponge with air-permeable properties.

[0013] Compared with the prior art, the shock-resistant pressure gauge of the present invention has the following beneficial technical effects.

[0014] 1. During use, when the gauge body vibrates strongly, the deflector will deflect and adjust the damping effect according to the speed of pointer movement, releasing the vibration energy into the damping fluid. This effectively suppresses high-frequency pointer fluctuations and buffers the vibration impact on the elastic and transmission components. Thus, without increasing the viscosity of the damping fluid, the shock resistance and operational stability of the shock-resistant gauge are improved from another technical direction, extending its service life in high-vibration environments. It has a particularly significant suppression effect on gauge body vibration caused by drastic fluctuations in the measured pressure, and its shock resistance is more outstanding under such conditions.

[0015] 2. During use, when the vibration of the gauge body is weak, the deflection part remains in the initial position and does not exert additional damping on the pointer. This allows the shock-resistant pressure gauge to have high measurement accuracy and response speed in normal working environments. At the same time, it avoids the internal components of the gauge body from operating continuously under high damping conditions for a long time, thereby reducing mechanical wear and fatigue and extending service life.

[0016] 3. Since the deflection part can play a damping role, the damping fluid can be made with a lower viscosity, which further enhances the above-mentioned technical effects; the expansion coefficient of the damping fluid can be reduced accordingly with the viscosity, making the working performance of the shock-resistant pressure gauge more stable and reliable, and more suitable for the working environment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0018] Figure 1 This is a schematic diagram of the shock-resistant pressure gauge in the embodiment.

[0019] Figure 2 This is a schematic diagram of the pointer structure in the embodiment.

[0020] Figure 3 This is a schematic diagram of the pointer in another direction in the embodiment.

[0021] Figure 4 This is a schematic diagram of the pointer body in the embodiment.

[0022] Figure 5 This is a schematic diagram of the deflection section in the embodiment.

[0023] Figure 6 This is a schematic diagram of the cooperation structure between the pointer body and the deflection part in the embodiment.

[0024] Figure 7This is a schematic diagram of the force state of the deflector when the pointer rotates in one direction in the embodiment.

[0025] Figure 8 This is a schematic diagram of the force state of the deflector when the pointer rotates in another direction in the embodiment.

[0026] Figure 9 This is a schematic diagram of the mating structure of the pointer body, deflection part, and limiting protrusion in the embodiment.

[0027] Figure 10 This is a schematic diagram of the structure of the surface after partial cross-section in the embodiment.

[0028] Figure 11 This is a schematic diagram of the fit between the gauge body and the leak-proof vent valve in the embodiment.

[0029] Figure 12 This is a schematic diagram of the anti-leakage vent valve in its initial state in the embodiment.

[0030] Figure 13 This is a schematic diagram of the anti-leakage vent valve in the shut-off state in the embodiment.

[0031] Figure 14 This is a schematic diagram showing the state of the liquid-absorbing expansion body when the blocking plate is used to compress it in the embodiment.

[0032] In the picture:

[0033] 1. Surface body, 11. Liquid injection hole;

[0034] 2. Deflection section; 21. Inclined wall; 22. Deflection shaft; 23. Elastic strip;

[0035] 3. Pointer body; 31. Mounting hole; 32. Shaft hole; 33. Slot; 34. Limiting protrusion;

[0036] 4. Pointer axis;

[0037] 5. Clock face;

[0038] 6. Leak-proof vent valve; 61. Valve sleeve; 62. Side hole; 63. Valve cover; 64. Center hole; 65. Pressure rod; 66. Pressing part; 67. Liquid absorption expansion body; 68. Sealing gasket; 69. Blocking plate.

[0039] 7. Tighten the bolts. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0041] See Figures 1-6 As shown in the embodiment, the specific structure of the shock-resistant pressure gauge of the present invention is disclosed. The shock-resistant pressure gauge includes a gauge body 1, inside which a pressure sensing element and a transmission mechanism are installed, as well as a corresponding pointer and dial 5. The inner cavity of the gauge body 1 adopts a closed design and is filled with a damping fluid, such as silicone oil or glycerin. The pointer includes a pointer body 3 and a deflection part 2 installed at the front end of the pointer body 3. The pointer body 3 is provided with a mounting hole 31, which is fixedly connected to a pointer shaft 4 installed at the center of the dial 5. The front end of the pointer body 3, i.e., the end facing the scale, is provided with a shaft hole 32, which extends along the length direction of the pointer body 3. A locking mechanism is installed on the pointer body 3. The deflection part 2 and the pointer body 3 extend in the same direction. A rearwardly extending deflection shaft 22 is fixed at the center of the rear end of the deflection part 2. The rear end of the deflection shaft 22... An elastic strip 23 extending backward is fixed. The elastic strip 23 is long and has good elasticity, enabling it to undergo elastic torsional deformation. The elastic strip 23 passes through the shaft hole 32, and its rear end is fixed by the locking mechanism. The deflection shaft 22 is inserted into the shaft hole 32, and the two are rotated and slidably engaged, allowing the deflection shaft 22 to rotate within the shaft hole 32 and also to adapt to the deformation of the elastic strip 23. The deflection part 2 gradually narrows in width from back to front, making the front end of the deflection part 2 a pointed tip, which optimizes the structure of the deflection part 2 and improves the indicating effect. The two ends of the deflection part 2 along the width direction are respectively provided with a sloping wall 21. The sloping wall 21 adopts a sloping surface design and is not perpendicular to the dial 5. The two sloping walls 21 have the same inclination direction and can be distributed in a parallel or nearly parallel manner, making the shape of the deflection part 2 paddle-shaped.

[0042] Thus, the pointer body 3 and the deflection part 2 together constitute a pointer, which moves in the damping fluid as the measured pressure changes, and cooperates with the scale on the dial 5 to realize the pressure value indication function.

[0043] like Figures 1-3As shown, when the pointer moves slowly, the reaction force exerted by the damping fluid on the deflector 2 is small and insufficient to drive the deflector 2 to deflect. The deflector 2 will remain in the initial position, that is, the width directions of the deflector 2 and the pointer body 3 are the same. At this time, the movement resistance of the deflector 2 in the damping fluid is small and will not produce additional damping effect on the movement of the pointer.

[0044] like Figure 7 , Figure 8 As shown, when the pointer moves quickly, the deflection part 2 deflects along the deflection axis 22 under the reaction force of the damping fluid, and forces the elastic strip 23 to undergo elastic torsional deformation. After the deflection part 2 deflects, the resistance to movement in the damping fluid will increase, thereby damping the movement of the pointer. The faster the pointer moves, the larger the angle of deflection of the deflection part 2, and the greater the resistance to movement of the deflection part 2 in the damping fluid, thus making the damping effect on the pointer more significant. When the pointer moves slowly, the elastic strip 23 will drive the deflection part 2 to rotate back to the initial position, and the resistance to movement of the deflection part 2 in the damping fluid will decrease, thereby reducing the damping effect on the pointer.

[0045] Therefore, this shock-resistant pressure gauge has different responses to vibrations of different degrees. Specifically:

[0046] When the vibration of the gauge body 1 is weak, the pressure sensing element and transmission mechanism inside the gauge body 1 can work stably. The pointer moves slowly with the change of the measured pressure. At this time, the deflection part 2 remains in the initial position and will not produce additional damping effect on the pointer. This ensures the measurement accuracy and response speed of the shock-resistant pressure gauge under normal working conditions. At the same time, it avoids the internal components of the gauge body 1 from running continuously under high damping conditions for a long time, which would accelerate mechanical wear and fatigue and extend the service life of the shock-resistant pressure gauge.

[0047] When the gauge body 1 vibrates strongly, the pressure sensing element and transmission mechanism inside the gauge body 1 will drive the pointer to jump under vibration. At this time, the pointer moves at a relatively fast speed, and the deflection part 2 will deflect and adjust the magnitude of the damping effect according to the speed of the pointer movement, thereby releasing the vibration energy into the damping fluid. This effectively suppresses the high-frequency jumping of the pointer, allowing the pointer to move smoothly. The pointer transmits the damping effect to the transmission mechanism and pressure sensing element connected to it, buffering the vibration impact on the elastic and transmission components. Thus, without increasing the viscosity of the damping fluid, the vibration resistance and working stability of the shock-resistant pressure gauge are improved from another technical direction, extending the service life of the shock-resistant pressure gauge. In particular, it has a significant suppression effect on the vibration of the gauge body 1 caused by drastic fluctuations in the measured pressure, and the vibration resistance is more prominent under such working conditions.

[0048] like Figure 1As shown, in the structure adopted by this shock-resistant pressure gauge, the deflection part 2 is located at one end of the pointer centrifugation. When the pointer moves, the deflection part 2 can obtain a large linear velocity, thereby being able to more sensitively capture the vibration of the gauge body 1, so as to switch to the deflection state in time and suppress the vibration through the damping effect.

[0049] like Figure 7 , Figure 8 As shown, in the structure adopted by this shock-resistant pressure gauge, when the deflector 2 moves in one direction with the pointer, driven by the reaction force F1 of the damping fluid, the deflector 2 will deflect along direction a to provide damping for the pointer; when the deflector 2 moves in another direction with the pointer, driven by the reaction force F2 of the damping fluid, the deflector 2 will still deflect along direction a to provide damping for the pointer; thus, when the pointer moves rapidly in any direction, the deflector 2 will deflect in the same direction to provide damping for the pointer; therefore, when the pointer jumps, although the direction of the pointer's movement changes frequently, the damping effect of the deflector 2 on the pointer will not suddenly stop, but tends to be continuous and stable, thereby achieving a good damping effect and improving the vibration suppression effect.

[0050] When this shock-resistant pressure gauge is in operation, the damping effect is enhanced by the deflection part 2, thereby improving its shock resistance performance. Therefore, the damping fluid can be made with a lower viscosity, which further improves the measurement accuracy and response speed, while mechanical wear and fatigue can be further reduced. The expansion coefficient of the damping fluid is also reduced accordingly with the viscosity, making the working performance of the shock-resistant pressure gauge more stable and reliable, and giving it better applicability to the working environment.

[0051] Preferably, the pointer body 3 and the deflection part 2 are made of lightweight metal material to have sufficient strength; the elastic strip 23 is made of elastic metal material to have good elasticity; since the deflection part 2, the deflection shaft 22 and the elastic strip 23 are small in size, in order to facilitate processing and manufacturing, an integral structure is preferred, which is integrally formed from the same elastic metal material. The deflection part 2 and the deflection shaft 22 can have sufficient structural strength based on their own shape characteristics, while the elastic strip 23 can adopt a flat strip design to achieve good elastic deformation capability, and thus be able to generate corresponding elastic torsional deformation as the deflection part 2 deflects.

[0052] Preferred, such as Figure 2 , Figure 4 , Figure 6As shown, a slot 33 is provided at the bottom of the shaft hole 32. The locking mechanism is a clamping bolt 7, which is located on one side of the slot 33. The rear end of the elastic strip 23 is inserted into the slot 33 and clamped and fixed by the clamping bolt 7. Thus, when assembling the pointer body 3 and the deflection part 2, the deflection shaft 22 and the elastic strip 23 are inserted into the shaft hole 32, so that the rear end of the elastic strip 23 is inserted into the slot 33, and the clamping bolt 7 is tightened, and the device is installed in place. This is convenient, quick, and easy to operate.

[0053] Preferably, the center lines of the deflection axis 22 and the pointer axis 4 intersect perpendicularly, and the center of the front end face of the deflection part 2 is located on the center line of the deflection axis 22. This ensures that the deflection part 2 does not affect the pointer's indicating performance when it deflects, and at the same time ensures that the weight distribution of the pointer does not change significantly when the deflection part 2 deflects.

[0054] Preferred, such as Figure 9 As shown, a limiting protrusion 34 is provided on the front end surface of the pointer body 3. After the deflection part 2 rotates back to the initial position from the deflection state, it just abuts against the limiting protrusion 34, and thus cannot continue to rotate in the original direction. The elastic strip 23 can drive the deflection part 2 to abut against the limiting protrusion 34; thereby enabling the deflection part 2 to be reset to the initial position more accurately.

[0055] In existing shock-resistant pressure gauges, an oil filling hole is required on the upper side of the gauge body for replenishing or replacing the damping fluid. This hole is typically sealed with a rubber stopper to prevent leakage or dust intrusion during transportation and storage. Before initial use or maintenance, the rubber protrusion needs to be cut open or a hole punched to create a vent, ensuring pressure balance inside and outside the gauge and preventing impact on measurement accuracy. During repairs, verifications, and calibrations of the shock-resistant pressure gauge, damping fluid easily leaks from the vent, polluting the environment and causing insufficient fluid levels inside the gauge, requiring replenishment and making the process cumbersome. Therefore, this invention addresses the above-mentioned technical problems with the following improvements:

[0056] See Figures 10-12As shown, a liquid injection hole 11 is provided on the upper side of the gauge body 1, and a leak-proof vent valve 6 is installed on the liquid injection hole 11; the leak-proof vent valve 6 includes a valve sleeve 61, a valve cover 63, a pressure rod 65, a plug plate 69, and a liquid absorption expansion body 67; the valve sleeve 61 is sealed to the liquid injection hole 11, the bottom of the valve sleeve 61 is a closed structure, and a side hole 62 is provided on the side wall to communicate with the inner cavity of the gauge body 1 and the inside of the valve sleeve 61; the liquid absorption expansion body 67 is placed in the inner cavity of the valve sleeve 61, located in the damping fluid. Above the liquid surface, the liquid-absorbing expansion body 67 has the ability to absorb damping liquid, and will expand and deform after absorbing damping liquid; the valve cover 63 is sealed and fixed to the upper end of the valve sleeve 61, thereby sealing the upper end of the valve sleeve 61, and the valve cover 63 has a central hole 64 that runs vertically through it; the pressure rod 65 passes through the central hole 64, and the two slide together with a gap that allows the inner cavity of the valve sleeve 61 to communicate with the outside; the blocking plate 69 is fixed to the lower end of the pressure rod 65, and the blocking plate 69 is located above the liquid-absorbing expansion body 67.

[0057] like Figure 12 As shown, in the initial state, the anti-leakage vent valve has the liquid absorption expansion body 67 located above the damping liquid surface, thus preventing expansion. The inner cavity of the gauge body 1 is connected to the outside atmosphere through the side hole 62, the inner cavity of the valve sleeve 61, and the central hole 64, so that the pressure inside and outside the gauge body 1 is consistent, thereby ensuring the measurement accuracy of the shock-resistant pressure gauge.

[0058] like Figure 13 As shown, when the shock-resistant pressure gauge is disassembled for maintenance, inspection, and calibration, the damping fluid will flow into the valve sleeve 61 through the side hole 62 during the tilting process. The damping fluid will come into contact with the liquid absorption expansion body 67 inside the valve sleeve 61. After absorbing the damping fluid, the liquid absorption expansion body 67 will expand and deform, pushing the blocking plate 69 upward. The blocking plate 69 will then seal the lower end of the central hole 64, isolating the inner cavity of the valve sleeve 61 from the outside world. That is, the anti-leakage vent valve 6 reaches the shut-off state, thereby preventing the damping fluid from leaking into the outside world and polluting the environment. At the same time, it reduces the loss of damping fluid inside the gauge body. No manual operation is required, which is convenient and quick.

[0059] like Figure 14 As shown, when the shock-resistant pressure gauge is reinstalled for use, the external force drives the pressure rod 65 to move slowly downwards, and the blocking plate 69 will compress the liquid-absorbing expansion body 67. The damping liquid adsorbed inside the liquid-absorbing expansion body 67 is squeezed out and flows back into the gauge body 1 through the side hole 62. At this time, the anti-leakage vent valve 6 returns to its initial state, so that the inside of the gauge body 1 is connected to the outside atmosphere again.

[0060] Furthermore, such as Figure 11 , Figure 12 As shown, the upper end of the pressure rod 65 is provided with a pressing part 66, so as to manually drive the pressure rod 65 down to compress the liquid-absorbing expansion body 67.

[0061] Furthermore, the valve sleeve 61 is threadedly connected to the injection hole 11, which allows for quick installation and disassembly of the leak-proof vent valve 6, facilitating the replacement and replenishment of the damping fluid.

[0062] Furthermore, such as Figure 12 , Figure 13 As shown, a sealing gasket 68 is fixed on the upper side of the blocking plate 69 to improve the sealing effect on the central hole 64.

[0063] Furthermore, the liquid-absorbing swelling body 67 can be made of liquid-absorbing swelling rubber, foam, or sponge; preferably, the liquid-absorbing swelling body 67 is made of breathable synthetic sponge, so that the liquid-absorbing swelling body 67 has an air filtration function, which can ensure that the inside of the watch body 1 is in communication with the outside atmosphere, and can effectively prevent dust, impurities and other foreign objects from entering the inside of the watch body 1, so as to ensure the precise fit of the internal components of the watch body.

[0064] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A shock-resistant pressure gauge, comprising a gauge body, a pointer and a dial disposed within the gauge body, and the gauge body being filled with damping fluid; characterized in that: The pointer includes a pointer body and a deflection part. The pointer body is fixedly connected to a pointer shaft installed at the center of the dial. The front end of the pointer body has a shaft hole extending along its length, and the pointer body is provided with a locking mechanism. The deflection part and the pointer body extend in the same direction. A deflection shaft extending backward is fixed at the center of the rear end of the deflection part, and a flexible strip extending backward is fixed at the rear end of the deflection shaft. The flexible strip passes through the shaft hole, and the rear end of the flexible strip is fixed by the locking mechanism. The deflection shaft is inserted into the shaft hole, and the two are in a rotating sliding fit. The two ends of the deflection part along the width direction are respectively provided with an inclined wall, and the inclination direction of the two inclined walls is the same. When the deflection part is in the initial position, the width direction of the deflection part and the pointer body is the same. When the pointer moves, the deflector is driven by the reaction force of the damping fluid to deflect along the deflection axis. The larger the deflection angle, the greater the resistance to movement of the deflector in the damping fluid.

2. The shock-resistant pressure gauge according to claim 1, characterized in that: The deflection section gradually narrows in width from back to front, making the front end of the deflection section a pointed tip.

3. The shock-resistant pressure gauge according to claim 1, characterized in that: The deflection part, deflection shaft and elastic strip are integrated into one structure and made of the same elastic metal material. The elastic strip is in the shape of a flat strip.

4. The shock-resistant pressure gauge according to claim 1, characterized in that: A slot is provided at the bottom of the shaft hole, and the locking mechanism is a clamping bolt. The clamping bolt is located on one side of the slot, and the rear end of the elastic strip is inserted into the slot and clamped and fixed by the clamping bolt.

5. The shock-resistant pressure gauge according to claim 1, characterized in that: The center lines of the deflection axis and the pointer axis intersect perpendicularly, and the center of the front end face of the deflection part is located on the center line of the deflection axis.

6. The shock-resistant pressure gauge according to claim 1, characterized in that: The front end face of the pointer body is provided with a limiting protrusion. After the deflection part returns from the deflection state to the initial position, it just abuts against the limiting protrusion, and thus cannot continue to rotate in the original direction. The elastic strip can drive the deflection part to abut against the limiting protrusion.

7. The shock-resistant pressure gauge according to claim 1, characterized in that: The upper side of the instrument body has an injection hole, and a leak-proof vent valve is installed on the injection hole. The leak-proof vent valve includes a valve sleeve, a valve cover, a pressure rod, a plug plate, and a liquid-absorbing expansion body. The valve sleeve is sealed to the injection hole, has a closed bottom structure, and has side holes on its side walls. The liquid-absorbing expansion body is placed in the inner cavity of the valve sleeve, above the surface of the damping fluid. The valve cover is sealed and fixed to the upper end of the valve sleeve and has a central hole. The pressure rod passes through the central hole, and the two slide together with a clearance that allows the inner cavity of the valve sleeve to communicate with the outside. The plug plate is fixed to the lower end of the pressure rod and is located above the liquid-absorbing expansion body.

8. The shock-resistant pressure gauge according to claim 7, characterized in that: The upper end of the pressure rod is provided with a pressing part.

9. The shock-resistant pressure gauge according to claim 7, characterized in that: The valve sleeve is threaded to the injection hole; a sealing gasket is fixed on the upper side of the plug plate.

10. The shock-resistant pressure gauge according to claim 7, characterized in that: The liquid-absorbing and swelling body is a synthetic sponge with air-permeable properties.

Images