Shock-proof pressure gauge with bidirectional damping mechanism

Abstract

The utility model discloses a shock-proof pressure gauge with a bidirectional damping mechanism, and relates to the technical field of pressure gauges. The shock-proof pressure gauge with the bidirectional damping mechanism comprises a shell, a base is fixedly connected to the bottom of an inner cavity of the shell, a fluid channel is formed in the base, a bourdon tube is fixedly connected to the interior of the base, the fluid channel is communicated with the bourdon tube, a mounting plate is fixedly connected to the side of the upper surface of the base, and the mounting plate is fixedly connected to the bottom of the inner cavity of the shell. The outer surface of the mounting plate is rotatably connected with a central rotating rod, the outer surface of the central rotating rod is fixedly connected with a torsional spring, a fixed gear and a pointer, the interior of the shell is fixedly connected with a dial, the outer surface of the shell is fixedly connected with a transparent dial plate, and the inner wall of the shell is fixedly provided with a bidirectional damping mechanism which comprises a damping cylinder barrel; according to the utility model, the shock resistance and the service life of the pressure gauge under the severe working condition are obviously improved and the service life of the pressure gauge under the severe working condition is obviously prolonged.

Description

Technical Field

[0001] This utility model relates to the field of pressure gauge technology, specifically to a shock-resistant pressure gauge with a bidirectional damping mechanism. Background Technology

[0002] A pressure gauge is an instrument used to measure the pressure of fluids such as gases, liquids, or steam. It is widely used in industries such as industry, petrochemicals, medicine, and aerospace. It uses an elastic element as its sensing element, measuring pressure through the elastic deformation of a Bourdon tube, diaphragm, or bellows, and transmitting this pressure deformation to a pointer, displaying the pressure value on the dial. The working principle of a pressure gauge is based on the deformation of a spring or the sensing element of an electronic sensor. When the pressure of the measured medium acts on the spring or sensor, it causes a change in its position or resistance, which is then transmitted to the pointer or digital display on the dial via mechanical or electrical signals. Depending on the measurement principle and operating environment requirements, pressure gauges can be classified into various types, including mechanical pressure gauges, electronic pressure gauges, differential pressure gauges, and absolute pressure gauges. Pressure gauges play a crucial role in monitoring and controlling pressure in fields such as industrial automation, petrochemicals, medical devices, food processing, and automobile manufacturing, ensuring the safe operation of equipment and the stability of production processes.

[0003] In existing technologies, to improve the indication stability of pressure gauges under vibration environments, it is common practice to fill the gauge housing with damping fluids such as silicone oil or glycerin. The viscosity of the liquid buffers the pointer's oscillation. However, this traditional liquid-filled shock-resistant structure has several inherent defects. First, its damping effect is essentially unidirectional and passively averaged. For common impact overpressures or sudden pressure changes caused by emergency depressurization in production processes, the damping effect is limited, easily leading to excessive extension or rapid rebound of the Bourdon tube, causing the pointer to violently strike the limit post or return to zero. This not only causes the reading to become instantly invalid but also seriously damages the transmission mechanism of the movement, shortening the instrument's lifespan. Second, liquid-filled instruments face the risk of damping fluid leakage in the long term, which may contaminate the process medium or the environment. Moreover, the liquid is volatile at high temperatures and its viscosity increases at low temperatures, resulting in unstable damping performance and poor environmental adaptability. In addition, external mechanical vibrations can be directly transmitted to the instrument's interior through the mounting base, causing high-frequency micro-vibrations in the pointer itself, making the reading unclear and affecting the accuracy and reliability of monitoring. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a shock-resistant pressure gauge with a bidirectional damping mechanism, thereby solving the problems mentioned in the background art regarding the traditional liquid-filled shock-resistant pressure gauge, which suffers from unidirectional passive damping, poor impact resistance, leakage risk, insufficient environmental adaptability, and difficulty in reducing external mechanical vibrations.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a shock-resistant pressure gauge with a bidirectional damping mechanism, comprising a housing, a base fixedly connected to the bottom of the housing cavity, a fluid channel formed inside the base, a Bourdon tube fixedly connected inside the base, the fluid channel communicating with the Bourdon tube, a mounting plate fixedly connected to the side of the upper surface of the base, a central rotating rod rotatably connected to the outer surface of the mounting plate, a torsion spring, a fixed gear, and a pointer fixedly connected to the outer surface of the central rotating rod, a scale fixedly connected inside the housing, and a scale fixedly connected to the outer surface of the housing. The device has a transparent dial. A bidirectional damping mechanism is fixedly installed on the inner wall of the housing. The bidirectional damping mechanism includes a damping cylinder. A piston head is provided in the inner cavity of the damping cylinder. A first piston rod and a second piston rod are fixedly connected to the upper and lower sides of the piston head, respectively. Multiple damping holes are opened inside the piston head. An electromagnetic coil is fixedly connected to the outer surface of the damping cylinder. A magnetorheological fluid cavity is provided in the inner cavity of the damping cylinder. A threaded mounting sleeve is fitted on the lower middle part of the outer surface of the base. An annular top plate is fixedly connected to the top of the threaded mounting sleeve. Disc spring assemblies are fixedly connected to the upper and lower surfaces of the annular top plate.

[0006] Preferably, a fixing rod is fixedly connected to the outer surface of the mounting plate, and a sector gear is rotatably connected to the outer surface of the fixing rod. The sector gear meshes with the fixing gear, and a connecting rod is fixedly connected to the outer surface of the sector gear.

[0007] Preferably, a main connecting rod is hinged to the end of the Bourdon tube away from the base, and the end of the main connecting rod away from the Bourdon tube is hinged to a connecting rod. A movable sleeve is fitted on the outer surface of the main connecting rod, and the top end of the first piston rod is hinged to the outer surface of the movable sleeve.

[0008] Preferably, an mounting rod is fixedly connected to the outer surface of the damping cylinder, and the end of the mounting rod away from the damping cylinder is fixedly connected to the inner wall of the housing. The magnetorheological fluid cavity is arranged in the cavity space above the piston head and the cavity space below the piston head.

[0009] Preferably, the base has an internal cavity, the outer surface of the annular top plate is fitted inside the internal cavity, the end of the disc spring assembly away from the annular top plate is connected to the upper or lower surface of the internal cavity, and a sealing ring is embedded at the bottom of the inner surface of the threaded mounting sleeve, the inner surface of the sealing ring is in contact with the outer surface of the base.

[0010] Preferably, a fixing block is fixedly connected to the inner surface of the threaded mounting sleeve, and a guide groove is provided in the lower middle part of the outer surface of the base, with the fixing block slidably disposed inside the guide groove.

[0011] Preferably, the torsion spring, the fixed gear, and the pointer are arranged sequentially from the inside to the outside along the outer surface of the central rotating rod. The central rotating rod passes through the dial, the pointer is located on the outside of the dial, the transparent dial is located on the outside of the pointer, a fixing pin is fixedly connected to the outer surface of the mounting plate, and the end of the torsion spring away from the central rotating rod is fixedly connected to the fixing pin. Beneficial effects

[0012] This invention provides a shock-resistant pressure gauge with a bidirectional damping mechanism. It has the following advantages:

[0013] 1. This shock-resistant pressure gauge with a bidirectional damping mechanism utilizes a bidirectional damping mechanism consisting of a damping cylinder, piston head, first and second piston rods, damping orifice, electromagnetic coil, and magnetorheological fluid chamber. This mechanism is linked to the end of the Bourdon tube via a main connecting rod and a movable sleeve. This invention achieves intelligent bidirectional damping of pressure pulsations. Under stable pressure, the magnetorheological fluid flows smoothly through the damping orifice without affecting the accurate indication of the pointer. However, when encountering severe pressure shocks or unloading, the rapid movement of the piston head causes the magnetorheological fluid to flow at high speed through the damping orifice, generating significant viscous resistance. Simultaneously, the electromagnetic coil is instantaneously excited to generate a magnetic field, causing the magnetorheological fluid to undergo a rheological effect and rapidly thicken, producing a powerful, near-solid-state locking damping force. This force acts in the opposite direction on the free end of the Bourdon tube, effectively suppressing its excessively rapid movement. This mechanism effectively prevents the pointer from tripping or violently returning to zero, significantly improving the pressure gauge's shock resistance and service life under harsh conditions, and solving the core problem of insufficient damping for sudden pressure changes in traditional liquid-filled instruments.

[0014] 2. This shock-resistant pressure gauge with a bidirectional damping mechanism optimizes the installation structure and sealing performance of the instrument by using a threaded mounting sleeve with an annular top plate and a disc spring assembly on the outside of the base, and an internal cavity inside the base to accommodate the annular top plate. Combined with the sliding guidance of the fixing block and guide groove, and the setting of the sealing ring, the disc spring assembly effectively absorbs and buffers axial vibration and impact from equipment or pipelines. The cooperation between the fixing block and the guide groove restricts the relative rotation between the threaded mounting sleeve and the base but allows limited axial displacement, avoiding direct damage to the internal structure of the instrument from installation torque. Meanwhile, the sealing ring ensures reliable sealing. This structure not only enhances the installation stability and sealing reliability of the pressure gauge in vibration environments but also reduces the precision requirements for installation torque, improving the convenience of engineering applications and broad environmental adaptability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0017] Figure 3 This is a cross-sectional structural diagram of the base of this utility model;

[0018] Figure 4 This is a schematic diagram of the bidirectional damping mechanism of this utility model.

[0019] In the diagram: 1. Housing; 2. Base; 3. Dial; 4. Transparent dial; 5. Mounting plate; 6. Central rotating rod; 7. Torsion spring; 8. Fixed gear; 9. Pointer; 10. Fixed rod; 11. Sector gear; 12. Connecting rod; 13. Bourdon tube; 14. Main connecting rod; 15. Bidirectional damping mechanism; 151. Damping cylinder; 152. Mounting rod; 153. Piston head; 154. First piston rod; 155. Second piston rod; 156. Damping hole; 157. Electromagnetic coil; 158. Magnetorheological fluid cavity; 16. Fluid channel; 17. Threaded mounting sleeve; 18. Annular top plate; 19. Disc spring assembly; 20. Internal cavity; 21. Fixed block; 22. Guide groove; 23. Sealing ring; 24. Fixed pin; 25. Movable sleeve. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] like Figures 1-4As shown, this utility model provides a shock-resistant pressure gauge with a bidirectional damping mechanism, including a housing 1. A base 2 is fixedly connected to the bottom of the inner cavity of the housing 1. A fluid channel 16 is opened inside the base 2. A Bourdon tube 13 is fixedly connected inside the base 2. The fluid channel 16 communicates with the Bourdon tube 13. A mounting plate 5 is fixedly connected to the side of the upper surface of the base 2. A central rotating rod 6 is rotatably connected to the outer surface of the mounting plate 5. A torsion spring 7, a fixed gear 8, and a pointer 9 are fixedly connected to the outer surface of the central rotating rod 6. A scale 3 is fixedly connected inside the housing 1. A transparent dial 4 is fixedly connected to the outer surface of the housing 1. A bidirectional damping mechanism is fixedly installed on the inner wall of the housing 1. Mechanism 15, bidirectional damping mechanism 15 includes a damping cylinder 151, the inner cavity of the damping cylinder 151 is provided with a piston head 153, the upper and lower sides of the piston head 153 are respectively fixedly connected with a first piston rod 154 and a second piston rod 155, the piston head 153 is provided with multiple damping holes 156, the outer surface of the damping cylinder 151 is fixedly connected with an electromagnetic coil 157, the inner cavity of the damping cylinder 151 is provided with a magnetorheological fluid cavity 158, the lower middle part of the outer surface of the base 2 is fitted with a threaded mounting sleeve 17, the top of the threaded mounting sleeve 17 is fixedly connected with an annular top plate 18, and the upper and lower surfaces of the annular top plate 18 are both fixedly connected with disc spring groups 19.

[0022] Specifically, a fixing rod 10 is fixedly connected to the outer surface of the mounting plate 5, and a sector gear 11 is rotatably connected to the outer surface of the fixing rod 10. The sector gear 11 meshes with the fixing gear 8, and a connecting rod 12 is fixedly connected to the outer surface of the sector gear 11. The fixing rod 10 provides a stable rotation fulcrum for the sector gear 11. The sector gear 11 accurately converts the swing from the connecting rod 12 into the meshing motion with the fixing gear 8, thereby amplifying the linear displacement of the Bourdon tube 13 and transmitting it as the rotational motion of the pointer 9.

[0023] Specifically, a main connecting rod 14 is hinged to the end of the Bourdon tube 13 away from the base 2. The end of the main connecting rod 14 away from the Bourdon tube 13 is hinged to the connecting rod 12. A movable sleeve 25 is fitted on the outer surface of the main connecting rod 14. The top end of the first piston rod 154 is hinged to the outer surface of the movable sleeve 25. When the free end of the Bourdon tube 13 makes an arc-shaped movement, the main connecting rod 14 moves accordingly and drives the movable sleeve 25 to move along the main connecting rod 14. Since the first piston rod 154 is hinged to the movable sleeve 25 and the damping cylinder 151 is fixed to the inner wall of the housing 1 by the mounting rod 152, the first piston rod 154 is constrained to move in a straight line up and down. The design of the movable sleeve 25 converts the arc-shaped movement of the main connecting rod 14 into the straight-line movement of the first piston rod 154, realizing the conversion and synchronization of the movement form.

[0024] Specifically, an mounting rod 152 is fixedly connected to the outer surface of the damping cylinder 151. The end of the mounting rod 152 away from the damping cylinder 151 is fixedly connected to the inner wall of the housing 1. The magnetorheological fluid cavity 158 is arranged in the cavity space above and below the piston head 153. The magnetorheological fluid cavity 158 is distributed in the cavity space above and below the piston head 153, providing a sealed working space for the magnetorheological fluid, ensuring that it can flow through the damping hole 156 and generate a damping effect when the piston head 153 moves in both directions.

[0025] Specifically, the base 2 has an internal cavity 20, the outer surface of the annular top plate 18 is fitted inside the internal cavity 20, the end of the disc spring assembly 19 away from the annular top plate 18 is connected to the upper or lower surface of the internal cavity 20, and a sealing ring 23 is embedded at the bottom of the inner surface of the threaded mounting sleeve 17. The inner surface of the sealing ring 23 is in contact with the outer surface of the base 2. The internal cavity 20 provides space for the annular top plate 18 and the disc spring assembly 19 to accommodate and move. The disc spring assembly 19 uses its high elasticity and pressure bearing capacity to effectively buffer the installation tightening force and external axial vibration, while the sealing ring 23 ensures the sealing reliability of the connection between the base 2 and the threaded mounting sleeve 17.

[0026] Specifically, a fixing block 21 is fixedly connected to the inner surface of the threaded mounting sleeve 17, and a guide groove 22 is provided in the lower middle part of the outer surface of the base 2. The fixing block 21 is slidably disposed inside the guide groove 22. The sliding pair formed by the fixing block 21 and the guide groove 22 restricts the relative rotation between the threaded mounting sleeve 17 and the base 2, ensuring axial buffering in conjunction with the disc spring assembly 19 when subjected to vibration.

[0027] Specifically, the torsion spring 7, the fixed gear 8, and the pointer 9 are arranged sequentially from the inside to the outside along the outer surface of the central rotating rod 6. The central rotating rod 6 passes through the dial 3, and the pointer 9 is located on the outside of the dial 3. The transparent dial 4 is located on the outside of the pointer 9. The outer surface of the mounting plate 5 is fixedly connected to the fixing pin 24. The end of the torsion spring 7 away from the central rotating rod 6 is fixedly connected to the fixing pin 24. The torsion spring 7 is fixed to the fixing pin 24 at one end and acts on the central rotating rod 6 at the other end, providing a stable zero-return torque for the entire pointer 9 transmission system, ensuring that the pointer 9 can accurately return to its position after the pressure is released.

[0028] The working principle of the above embodiments:

[0029] In use, the pressure gauge is installed through the threaded mounting sleeve 17 at the bottom of the base 2. During operation, when the measured medium enters the Bourdon tube 13 through the fluid channel 16 inside the base 2, the Bourdon tube 13 undergoes elastic deformation under its internal pressure, and its free end undergoes arc-shaped displacement. This displacement drives the main connecting rod 14, which is hinged to it, to move. The main connecting rod 14 drives the connecting rod 12 at its other end to swing, and the connecting rod 12 pushes the sector gear 11 fixed to it to rotate around the fixed rod 10. The sector gear 11 then drives the fixed gear 8 meshing with it and the coaxial central rotating rod 6 to rotate, ultimately causing the fixed rod 10 to rotate. The pointer 9 on the central rotating rod 6 deflects relative to the dial 3, indicating pressure. Simultaneously, the movable sleeve 25 fitted onto the main connecting rod 14 moves axially along the main connecting rod 14. This movement of the movable sleeve 25 drives the first piston rod 154, which is hinged to it, to move. Since the damping cylinder 151 is fixed to the inner wall of the housing 1 via the mounting rod 152, the first piston rod 154 is constrained to linear up-and-down motion. Therefore, the movable sleeve 25 converts the arc-shaped motion of the main connecting rod 14 into the linear motion of the first piston rod 154, achieving a synchronous conversion of motion modes. The first piston rod 154 then pushes the piston... The piston head 153 moves within the damping cylinder 151 filled with magnetorheological fluid, while the second piston rod 155 moves synchronously. Under stable pressure, the piston head 153 moves slowly, allowing the magnetorheological fluid to flow smoothly through the damping orifice 156 on the piston head 153. At this time, the damping force is very small and does not affect the normal indication of the pointer 9. When encountering severe pressure pulsation or impact, the free end of the Bourdon tube 13 moves rapidly, causing the piston head 153 to move quickly. The magnetorheological fluid flows at high speed through the damping orifice 156, generating huge viscous resistance. At the same time, the control circuit can instantaneously excite the electromagnetic coil 157 wound around the outside of the damping cylinder 151, generating a strong magnetic field, causing... The magnetorheological fluid flowing through the damping orifice 156 thickens instantly or even nearly solidifies, generating a near-locking damping force. This force acts in the opposite direction on the free end of the Bourdon tube 13 through the first piston rod 154, the movable sleeve 25, and the main connecting rod 14, strongly suppressing its excessively rapid extension or retraction, thereby effectively preventing the pointer 9 from hitting the dial indicator or violently returning to zero, achieving bidirectional protection for the movement. In addition, when the equipment or pipeline connected to this pressure gauge vibrates, the disc spring assembly 19 deforms, weakening the vibration through its elasticity. The fixed block 21 moves along the guide groove 22, and the sealing ring 23 ensures the sealing between the base 2 and the threaded mounting sleeve 17.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A shockproof pressure gauge with a bidirectional damping mechanism, comprising a housing (1), characterized in that: The bottom of the inner cavity of the shell (1) is fixedly connected with a base (2), a fluid passage (16) is arranged in the base (2), a Borda tube (13) is fixedly connected to the inside of the base (2), the fluid passage (16) is communicated with the Borda tube (13), a mounting plate (5) is fixedly connected to the edge of the upper surface of the base (2), a central rotating rod (6) is rotatably connected to the outer surface of the mounting plate (5), a torsional spring (7), a fixed gear (8) and a pointer (9) are fixedly connected to the outer surface of the central rotating rod (6), a scale disc (3) is fixedly connected to the inside of the shell (1), a transparent dial plate (4) is fixedly connected to the outer surface of the shell (1), a double-way damping mechanism (15) is fixedly installed on the inner wall of the shell (1), the double-way damping mechanism (15) comprises a damping cylinder (151), a piston head (153) is arranged in the inner cavity of the damping cylinder (151), a first piston rod (154) and a second piston rod (155) are fixedly connected to the upper and lower sides of the piston head (153) respectively, a plurality of damping holes (156) are arranged in the inside of the piston head (153), an electromagnetic coil (157) is fixedly connected to the outer surface of the damping cylinder (151), a magnetorheological fluid cavity (158) is arranged in the inner cavity of the damping cylinder (151), a threaded mounting sleeve (17) is sleeved on the middle lower part of the outer surface of the base (2), an annular top plate (18) is fixedly connected to the top of the threaded mounting sleeve (17), disc spring groups (19) are fixedly connected to the upper and lower surfaces of the annular top plate (18).

2. A shock resistant pressure gauge with a bidirectional damping mechanism according to claim 1, characterized in that: The outer surface of the mounting plate (5) is fixedly connected with a fixed rod (10), a sector gear (11) is rotatably connected to the outer surface of the fixed rod (10), the sector gear (11) is engaged with the fixed gear (8), and a connecting rod (12) is fixedly connected to the outer surface of the sector gear (11).

3. A shock resistant pressure gauge with a bidirectional damping mechanism according to claim 2, characterized in that: The end, away from the base (2), of the Borda tube (13) is hingedly connected with a main connecting rod (14), one end, away from the Borda tube (13), of the main connecting rod (14) is hingedly connected with the connecting rod (12), and an active sleeve (25) is sleeved on the outer surface of the main connecting rod (14).

4. The shock resistant pressure gauge with a bidirectional damping mechanism according to claim 1, characterized in that: The outer surface of the damping cylinder (151) is fixedly connected with a mounting rod (152), one end, away from the damping cylinder (151), of the mounting rod (152) is fixedly connected to the inner wall of the shell (1), and the magnetorheological fluid cavity (158) is arranged in the cavity space above and below the piston head (153).

5. The shock resistant pressure gauge with a bidirectional damping mechanism according to claim 1, characterized in that: An inner cavity (20) is arranged in the inside of the base (2), the outer surface of the annular top plate (18) is sleeved in the inner cavity (20), one end, away from the annular top plate (18), of the disc spring group (19) is connected with the upper surface or the lower surface of the inner cavity (20), a sealing ring (23) is embedded in the bottom of the inner surface of the threaded mounting sleeve (17), and the inner surface of the sealing ring (23) is in contact with the outer surface of the base (2).

6. A shock resistant pressure gauge with a bidirectional damping mechanism according to claim 1, characterized in that: The inner surface of the threaded mounting sleeve (17) is fixedly connected with a fixing block (21), the middle and lower part of the outer surface of the base (2) is provided with a guide groove (22), and the fixing block (21) is slidingly arranged in the guide groove (22).

7. The shock resistant pressure gauge with a bidirectional damping mechanism according to claim 1, characterized in that: The torsional spring (7), the fixed gear (8) and the pointer (9) are sequentially arranged from inside to outside along the outer surface of the central rotating rod (6), the central rotating rod (6) penetrates the scale disc (3), the pointer (9) is arranged outside the scale disc (3), the transparent dial plate (4) is arranged outside the pointer (9), and the outer surface of the mounting plate (5) is fixedly connected with a fixing pin (24).

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