Diaphragm type pressure gauge
By using filter plates and cleaning mechanisms in the diaphragm pressure gauge, the problems of diaphragm damage and reduced detection accuracy caused by solid float accumulation are solved, and a higher service life and detection accuracy are achieved.
Patent Information
- Application Number
- CN202510041674.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-10
- Publication Date
- 2025-04-08
AI Technical Summary
When pressure detection is performed on a fluid medium containing solid float, solid float accumulates on the surface of the diaphragm, resulting in diaphragm damage and reduced pressure detection accuracy.
A diaphragm pressure gauge is designed, using a filter plate and a cleaning mechanism. The filter plate prevents solid float from entering the diaphragm. The cleaning mechanism uses the buoyancy of the fluid medium to scrape away solid float on the lower surface of the filter plate.
Effectively prevent solid float from accumulating on the surface of the diaphragm, extending the service life of the diaphragm, and improving the accuracy and stability of fluid medium pressure detection.
Smart Images
Figure CN119779543A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of pressure gauges, and in particular relates to a diaphragm pressure gauge. Background Art
[0002] The diaphragm pressure gauge is a special pressure measuring instrument, which consists of a diaphragm isolator and a general-purpose pressure gauge. This gauge is mainly used to measure the pressure of highly corrosive, high-temperature, high-viscosity, easy to crystallize, easy to solidify or solid floating media. It is particularly suitable for measuring the flow fluid medium pressure in the production process of industrial sectors such as petrochemicals, alkali making, chemical fiber, dyeing, pharmaceuticals, food and cheese making. The working principle of the diaphragm pressure gauge is to isolate the medium through the diaphragm and transfer the pressure to the elastic element, thereby realizing the measurement of pressure. This design enables the diaphragm pressure gauge to be effectively isolated from the measured medium during the measurement process, improving the accuracy and stability of the measurement. The temperature characteristics of the diaphragm pressure gauge are related to the thermal expansion coefficient of the sealing liquid and the diaphragm stiffness, and its temperature influence is related to the expansion coefficient of the sealing body, the diaphragm stiffness and the pressure temperature.
[0003] The structure of the diaphragm pressure gauge is more complex and has higher accuracy and stability. Its key component is the diaphragm, which is usually made of corrosion-resistant materials such as stainless steel and silicone and has a certain degree of elasticity. When the pressure of the measured medium acts on the diaphragm, the diaphragm will deform, and the deformation will be converted into an electrical signal or mechanical displacement through the sensing device connected to the inside of the pressure gauge, thereby realizing pressure measurement. The diaphragm pressure gauge has a wide range of application scenarios, especially in harsh environments such as high pressure, high temperature, and corrosion, it shows stronger anti-interference and anti-clutter capabilities. Because it has good sealing and reliability, it can effectively isolate the measured medium, so it is particularly suitable for measuring the pressure of high-viscosity media or special media such as easy to crystallize and easy to dry.
[0004] When performing pressure testing on a fluid medium containing solid suspended matter, the solid suspended matter will accumulate on the surface of the diaphragm of the pressure gauge. Over time, as the amount of accumulated solid suspended matter increases, on the one hand, the surface of the diaphragm will be eroded by the solid suspended matter and damaged, affecting its service life. On the other hand, when the solid suspended matter accumulates to a certain extent, it will interfere with the pressure of the fluid medium near the diaphragm, thereby affecting the diaphragm's pressure detection of the fluid medium. Summary of the invention
[0005] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a diaphragm pressure gauge.
[0006] The technical solution adopted to solve the above technical problems is: A diaphragm pressure gauge comprises a gauge body, a gauge body mounting flange, a diaphragm and a pipe connecting flange, wherein the gauge body mounting flange and the pipe connecting flange are connected via a plurality of bolt pairs, a threaded pipe is fixedly connected to the end of the pipe connecting flange, the diaphragm is installed between the gauge body mounting flange and the pipe connecting flange, a filter plate is fixedly connected to the inner wall of the threaded pipe, and a cleaning mechanism is also provided in the threaded pipe.
[0007] Through the above technical solution, a filter plate is set, and the fluid medium can pass through the filter plate and enter between the pipeline connecting flange and the meter body mounting flange, thereby generating pressure on the diaphragm, causing the diaphragm to deform, and at the same time, the solid floating matter in the fluid medium entering the threaded pipe can be blocked, avoiding the accumulation of solid floating matter on the lower surface of the diaphragm and the erosion of the diaphragm and the impact on the detection accuracy of the fluid medium. In addition, a cleaning mechanism is set to utilize the buoyancy of the fluid medium to scrape and clean the solid floating matter attached to the lower surface of the filter plate, and the structure is simple.
[0008] Furthermore, the cleaning mechanism includes a fixed ring coaxially fixed to the inner wall of the threaded tube, the fixed ring is located below the filter plate and its inner hole wall is rotatably connected to a rotating ring, a plurality of support arms are fixed to the inner wall of the rotating ring, a plurality of support arms are fixed to the upper surfaces of the support arms are fixed to scrapers, the upper surfaces of the scrapers are in contact with the lower surface of the filter plate, and a rotating component for driving the rotating ring to rotate is provided in the threaded tube.
[0009] Through the above technical solution, the rotating ring is driven to rotate by the rotating assembly, so that the rotating ring drives the scraper to rotate. When the scraper rotates, the solid floating matter attached to the lower surface of the filter plate can be scraped off, so that the solid floating matter moves away from the filter plate with the flow of the fluid medium.
[0010] Furthermore, the rotating assembly includes a connecting sleeve fixedly connected to the common end of the plurality of support arms, the end face of the connecting sleeve is provided with a through hole, a floating rod is coaxially penetrated in the through hole, the floating rod can slide and rotate freely in the through hole, the floating rod penetrates the filter plate and is key-connected to the filter plate, two balls are rotatably embedded in the inner wall of the through hole, a spiral rolling groove for the balls to engage is provided on the periphery of the floating rod, the balls can roll freely in the spiral rolling groove, and a floating unit for driving the floating rod to move axially along the threaded tube is also provided in the threaded tube.
[0011] Through the above technical solution, the floating unit drives the floating rod to move along the axial direction of the threaded tube, so that the ball moves relative to the floating rod, and then the ball can roll in the spiral rolling groove. During the rolling process, the connecting sleeve is driven to rotate. When the connecting sleeve rotates, it will synchronously drive the rotating ring to rotate, so that the rotating ring drives the scraper to rotate, so that the scraper can clean and scrape the lower surface of the filter plate.
[0012] Furthermore, the floating unit includes a sealing plug fixedly connected to the inner wall of the threaded tube, the end face of the sealing plug is provided with a through groove for the floating rod to pass freely, the sealing plug is located above the filter plate, one end of the floating rod facing the sealing plug is coaxially fixed with a rubber plug, and the end face of the sealing plug is provided with a connecting port for the rubber plug to engage.
[0013] Through the above technical solution, the fluid medium penetrates the filter plate and enters the through groove, thereby generating buoyancy on the rubber plug, causing the rubber plug to move toward the diaphragm, thereby opening the through groove and the connecting port, allowing the fluid medium to enter between the pipeline connecting flange and the diaphragm, and generate pressure on the diaphragm. When pressure detection is not required, no fluid medium flows in the external pipeline, and the buoyancy of the rubber plug disappears, causing the rubber plug to re-engage in the connecting port and seal the connecting port, thereby preventing foreign matter, microorganisms, etc. in the pipeline from growing and adhering to the surface of the diaphragm, thereby protecting the surface of the diaphragm.
[0014] Furthermore, a stop ring is fixedly sleeved on the lower end of the floating rod, and an elastic member is provided between the stop ring and the lower end surface of the connecting sleeve, and the elastic member has an elastic resisting force on the stop ring toward the outer side of the threaded pipe mouth.
[0015] Through the above technical solution, the elastic part has a pre-pressure on the stop ring, so that when the rubber plug moves toward the diaphragm, the elastic part accumulates elastic potential energy. When the buoyancy of the rubber plug disappears, the elastic potential energy accumulated by the elastic part is released, thereby driving the rubber plug to quickly move in the opposite direction and reset, and tightly seal the connecting port.
[0016] Furthermore, the elastic member is a spring, the spring sleeve is wound around the periphery of the floating rod, and the two ends of the spring in the direction of elastic force elastically press against the upper end surface of the stop ring and the lower end surface of the connecting sleeve respectively.
[0017] Through the above technical solution, the spring is in a slightly compressed state in the initial state, thereby exerting a pre-pressure on the stop ring toward the outside of the threaded pipe mouth, so that the rubber plug can seal the connecting port in the initial state.
[0018] Furthermore, a follower ring is coaxially rotatably sleeved on the lower end of the connecting sleeve, and the upper end in the direction of the elastic force of the spring abuts against the end surface of the follower ring.
[0019] Through the above technical solution, the follower ring can rotate freely on the connecting sleeve, so that when the connecting sleeve drives the rotating ring to rotate, the spring will not rotate with the connecting sleeve.
[0020] Furthermore, a transition groove is coaxially formed on one end surface of the sealing plug facing the filter plate, and the transition groove is connected with the through groove and the connecting port.
[0021] Through the above technical solution, the lower part of the rubber plug is located in the transition groove, so that when the fluid medium passes through the filter plate, it will enter the transition groove for accumulation, so that the pressure of the fluid medium in the threaded tube gradually increases, and then it can generate buoyancy on the rubber plug, so that the rubber plug can move more smoothly.
[0022] Furthermore, the outer diameter of the rubber plug increases gradually in a direction away from the floating rod, and the rubber plug and the communication port form a taper fit.
[0023] Through the above technical solution, after the rubber plug is engaged in the communicating port, the sealing effect of the communicating port is better.
[0024] Furthermore, an annular groove is coaxially formed in the hole wall of the fixed ring, and the rotating ring is engaged in the annular groove and can rotate freely in the annular groove.
[0025] Through the above technical solution, the rotating ring is rotatably connected to the fixed ring.
[0026] The beneficial effects of the present invention are as follows: In the present invention, the fluid medium can penetrate the filter plate and enter between the pipeline connection flange and the meter body mounting flange, thereby generating pressure on the diaphragm, causing the diaphragm to deform, and at the same time, can block the solid floating matter in the fluid medium entering the threaded pipe, thereby preventing the solid floating matter from accumulating on the lower surface of the diaphragm and affecting the diaphragm erosion and the detection accuracy of the fluid medium. In addition, a cleaning mechanism is provided to utilize the buoyancy of the fluid medium to scrape and clean the solid floating matter attached to the lower surface of the filter plate, and the structure is simple; In the present invention, the floating unit drives the floating rod to move along the axial direction of the threaded tube, so that the ball moves relative to the floating rod, and then the ball can roll in the spiral rolling groove. During the rolling process, the connecting sleeve is driven to rotate. When the connecting sleeve rotates, it will synchronously drive the rotating ring to rotate, so that the rotating ring drives the scraper to rotate, so that the scraper can clean and scrape the lower surface of the filter plate; In the present invention, the fluid medium penetrates the filter plate and enters the through groove, thereby generating buoyancy on the rubber plug, causing the rubber plug to move toward the diaphragm, thereby opening the through groove and the connecting port, allowing the fluid medium to enter between the pipeline connecting flange and the diaphragm, and generating pressure on the diaphragm. When pressure detection is not required, no fluid medium flows in the external pipeline, and the buoyancy on the rubber plug disappears, thereby causing the rubber plug to re-engage in the connecting port and seal the connecting port, thereby preventing foreign matter, microorganisms, etc. in the pipeline from growing and adhering to the surface of the diaphragm, thereby protecting the surface of the diaphragm. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 It is a schematic diagram of the overall structure of a diaphragm pressure gauge in the present invention; Figure 2 yes Figure 1 A schematic diagram of the structure from another perspective; Figure 3 yes Figure 1 The schematic diagram of the positional relationship of the meter body, meter body mounting flange and bolt pair is omitted; Figure 4 yes Figure 3 Schematic diagram of the positional relationship after the middle structure is cut open; Figure 5 yes Figure 4 A magnified schematic diagram of the local structure at point A; Figure 6 yes Figure 3 Schematic diagram of the positional relationship of some structures after being cut open from another perspective; Figure 7 yes Figure 3 Schematic diagram of structural explosion decomposition; Figure 8 yes Figure 7 Schematic diagram of the positional relationship from another perspective.
[0028] Figure numerals: 1. meter body; 2. meter body mounting flange; 3. diaphragm; 4. bolt pair; 5. pipe connection flange; 6. threaded pipe; 7. filter plate; 8. stop ring; 9. sealing plug; 10. floating rod; 11. rubber plug; 12. spiral rolling groove; 13. scraper; 14. ball; 15. spring; 16. follower ring; 17. support arm; 18. connecting sleeve; 19. fixing ring; 20. transition groove; 21. rotating ring; 22. connecting port; 23. through hole; 24. annular groove. DETAILED DESCRIPTION
[0029] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0030] like Figure 1-Figure 8 As shown, this embodiment provides a diaphragm pressure gauge, including a meter body 1, a meter body mounting flange 2, a diaphragm 3 and a pipeline connecting flange 5 of the diaphragm pressure gauge, the meter body mounting flange 2 and the pipeline connecting flange 5 are connected by a plurality of bolt pairs 4, a threaded pipe 6 is fixedly connected to the end of the pipeline connecting flange 5, the diaphragm 3 is installed between the meter body mounting flange 2 and the pipeline connecting flange 5, the threaded pipe 6 is installed on an external fluid medium delivery pipeline, and a filter plate 7 is fixedly connected to the inner wall of the threaded pipe 6; A fixing ring 19 is coaxially fixed to the inner wall of the threaded tube 6. The fixing ring 19 is located below the filter plate 7 and a rotating ring 21 is rotatably connected to the inner hole wall thereof. Specifically, an annular groove 24 is coaxially provided in the hole wall of the fixing ring 19. The rotating ring 21 is engaged in the annular groove 24 and rotates freely in the annular groove 24, so that the rotating ring 21 is rotatably connected to the fixing ring 19. A plurality of supporting arms 17 are fixed to the inner wall of the rotating ring 21. The plurality of supporting arms 17 are arranged in an array along the axial direction of the rotating ring 21. The plurality of supporting arms 17 have a common end, and a connecting sleeve 18 is fixedly connected to the common end. The connecting sleeve 18 is coaxial with the rotating ring 21. In addition, a scraper 13 is fixed to the upper surface of the supporting arm 17. The upper surface of the scraper 13 is in contact with the lower surface of the filter plate 7. A through hole 23 is provided on the end face of the connecting sleeve 18, and a floating rod 10 is coaxially provided in the through hole 23. The floating rod 10 can slide and rotate freely in the through hole 23. The floating rod 10 penetrates the filter plate 7 and is key-connected to the filter plate 7. Two balls 14 are rotatably embedded in the inner wall of the through hole 23. A spiral rolling groove 12 for the balls 14 to engage is provided on the periphery of the floating rod 10. The balls 14 can roll freely in the spiral rolling groove 12. A sealing stopper 9 is fixedly connected to the inner wall of the threaded tube 6. A through groove for the floating rod 10 to pass freely is provided on the end face of the sealing stopper 9. The sealing stopper 9 is located above the filter plate 7. A rubber plug 11 is coaxially fixedly connected to one end of the floating rod 10 facing the sealing stopper 9. The end face of the sealing stopper 9 A connecting port 22 for the rubber plug 11 to engage is provided, and a transition groove 20 is coaxially provided on one end face of the sealing plug 9 facing the filter plate 7. The transition groove 20 is connected with the through groove and the connecting port 22. The outer diameter of the rubber plug 11 increases successively in the direction away from the floating rod 10. The rubber plug 11 and the connecting port 22 form a taper fit. The lower part of the rubber plug 11 extends into the transition groove 20. A stop ring 8 is fixedly sleeved on the lower end of the floating rod 10, and a spring 15 is sleeved around the periphery of the floating rod 10. A follower ring 16 is coaxially rotatably sleeved on the lower end of the connecting sleeve 18. The upper end of the spring 15 in the elastic force direction abuts against the end face of the follower ring 16, and the lower end of the spring 15 in the elastic force direction abuts against the upper end face of the stop ring 8.
[0031] The working principle of this embodiment is as follows: When the fluid medium flows in the pipeline, the fluid medium will penetrate the filter plate 7 and enter the threaded tube 6. When the pressure of the fluid medium increases, it will generate buoyancy towards the diaphragm 3 on the rubber plug 11, so that the rubber plug 11 moves towards the diaphragm 3 under the action of the buoyancy, and the solid floating matter in the fluid medium will be filtered by the filter plate 7, so that the solid floating matter cannot enter the threaded tube 6. When the rubber plug 11 moves toward the direction of the diaphragm 3, it synchronously drives the floating rod 10 to move, so that the floating rod 10 moves toward the direction of the diaphragm 3. Since the floating rod 10 is key-connected to the filter plate 7, when the ball 14 rolls in the spiral rolling groove 12, it drives the connecting sleeve 18 to rotate. When the connecting sleeve 18 rotates, it synchronously drives the rotating ring 21 to rotate. The rotating ring 21 rotates, and then drives the scraper 13 to rotate. The upper surface of the scraper 13 abuts against the lower surface of the filter plate 7, and then the solid floating matter attached to the surface of the filter plate 7 can be scraped off. Since the rotating ring 21 is driven to rotate only when the floating rod 10 moves in the threaded tube 6, when the floating rod 10 is stationary, the rotating ring 21 is also in a stationary state, so solid suspended matter may adhere to the surface of the filter plate 7, thereby affecting the permeability of the filter plate 7. When the pressure of the fluid medium in the threaded tube 6 decreases relative to the pressure of the fluid medium outside the threaded tube 6 due to the decrease in the permeability of the filter plate 7, the elastic potential energy accumulated by the spring 15 will drive the rubber plug 11 to move in the direction away from the diaphragm 3, so that the floating rod 10 moves in the opposite direction, and then the rotating ring 21 rotates, so that the scraper 13 scrapes off the solid suspended matter attached to the surface of the filter plate 7. In this way, when the amount of solid suspended matter attached to the surface of the filter plate 7 increases, it can be scraped off automatically. The structure is simple and no manual intervention is required.
[0032] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention.
Claims
1. A diaphragm pressure gauge, characterized in that: The diaphragm pressure gauge comprises a meter body (1), a meter body mounting flange (2), a diaphragm (3) and a pipe connecting flange (5), wherein the meter body mounting flange (2) and the pipe connecting flange (5) are connected via a plurality of bolt pairs (4), a threaded pipe (6) is fixedly connected to the end of the pipe connecting flange (5), the diaphragm (3) is mounted between the meter body mounting flange (2) and the pipe connecting flange (5), a filter plate (7) is fixedly connected to the inner wall of the threaded pipe (6), and a cleaning mechanism is also provided inside the threaded pipe (6).
2. The diaphragm pressure gauge according to claim 1, characterized in that: The cleaning mechanism comprises a fixed ring (19) coaxially fixed to the inner wall of the threaded tube (6); the fixed ring (19) is located below the filter plate (7) and has an inner hole wall rotatably connected to a rotating ring (21); a plurality of support arms (17) are fixed to the inner wall of the rotating ring (21); a scraper (13) is fixed to the upper surfaces of the plurality of support arms (17); the upper surfaces of the scraper (13) are in contact with the lower surface of the filter plate (7); and a rotating assembly for driving the rotating ring (21) to rotate is provided in the threaded tube (6).
3. The diaphragm pressure gauge according to claim 2, characterized in that: The rotating assembly comprises a connecting sleeve (18) fixedly connected to the common end of the plurality of supporting arms (17); a through hole (23) is provided on the end surface of the connecting sleeve (18); a floating rod (10) is coaxially provided in the through hole (23); the floating rod (10) is freely slidable and rotatable in the through hole (23); the floating rod (10) penetrates the filter plate (7) and is key-connected to the filter plate (7); two balls (14) are rotatably embedded in the inner wall of the through hole (23); a spiral rolling groove (12) for engaging the balls (14) is provided on the periphery of the floating rod (10); the balls (14) are freely rolling in the spiral rolling groove (12); and a floating unit for driving the floating rod (10) to move axially along the threaded tube (6) is also provided in the threaded tube (6).
4. The diaphragm pressure gauge according to claim 3, characterized in that: The floating unit comprises a sealing plug (9) fixedly connected to the inner wall of the threaded tube (6), the end surface of the sealing plug (9) being provided with a through groove for the floating rod (10) to pass freely, the sealing plug (9) being located above the filter plate (7), the end of the floating rod (10) facing the sealing plug (9) being coaxially fixedly connected with a rubber plug (11), and the end surface of the sealing plug (9) being provided with a connecting port (22) for the rubber plug (11) to engage.
5. The diaphragm pressure gauge according to claim 4, characterized in that: A stop ring (8) is fixedly sleeved on the lower end of the floating rod (10), and an elastic member is provided between the stop ring (8) and the lower end surface of the connecting sleeve (18), wherein the elastic member exerts an elastic resisting force on the stop ring (8) toward the outer side of the mouth of the threaded tube (6).
6. The diaphragm pressure gauge according to claim 5, characterized in that: The elastic member is a spring (15), the spring (15) is wrapped around the periphery of the floating rod (10), and the two ends of the spring (15) in the elastic force direction elastically abut against the upper end surface of the stop ring (8) and the lower end surface of the connecting sleeve (18) respectively.
7. The diaphragm pressure gauge according to claim 6, characterized in that: The lower end of the connecting sleeve (18) is coaxially rotatably sleeved with a follower ring (16), and the upper end of the spring (15) in the elastic force direction abuts against the end surface of the follower ring (16).
8. The diaphragm pressure gauge according to claim 4, characterized in that: A transition groove (20) is coaxially formed on one end surface of the sealing stopper (9) facing the filter plate (7), and the transition groove (20) is connected to the through groove and the communication port (22).
9. The diaphragm pressure gauge according to claim 4, characterized in that: The outer diameter of the rubber plug (11) increases gradually in a direction away from the floating rod (10), and the rubber plug (11) and the communication port (22) form a taper fit.
10. The diaphragm pressure gauge according to claim 9, characterized in that: An annular groove (24) is coaxially formed in the hole wall of the fixed ring (19), and the rotating ring (21) is engaged in the annular groove (24) and can rotate freely in the annular groove (24).