Over-high pressure diaphragm type pressure gauge

Abstract

The invention discloses an overhigh-pressure diaphragm type pressure gauge, and belongs to the technical field of pressure gauges. Comprising an upper meter head assembly, a middle diaphragm assembly and a lower connecting assembly, the middle diaphragm assembly comprises a middle flange, a middle connecting pipe is arranged in the middle of the upper surface of the middle flange, a middle containing groove is formed in the lower surface of the middle flange, and one end of the middle connecting pipe is communicated with the middle containing groove; the other end of the middle connecting pipe is connected with the upper meter head assembly, a diaphragm is arranged at the other end of the middle containing groove, working fluid is arranged in the middle containing groove, an elastic film is arranged between the working fluid and the diaphragm and separates the working fluid from the diaphragm, a first flow channel and a second flow channel are symmetrically arranged on the middle flange, and the first flow channel and the second flow channel are communicated with each other. And one end of the first flow channel is communicated with a cavity formed between the elastic film and the diaphragm. The technical scheme is used for solving the problem that the diaphragm of the diaphragm pressure gauge is easy to damage when the diaphragm pressure gauge is subjected to high pressure beyond the measurement range.

Description

Technical Field

[0001] The invention belongs to the technical field of pressure gauges, and in particular relates to an ultra-high pressure diaphragm pressure gauge. Background Art

[0002] In chemical production, diaphragm pressure gauges are often used to measure pressure within specific process flows. However, due to external factors or inherent process complexity, the pressure of the measured medium may fluctuate. For example, in a pipeline transportation system, equipment failure or operational error can cause the pressure of the medium in the pipeline to increase dramatically, exceeding the measurement range of the diaphragm pressure gauge.

[0003] Traditional diaphragm pressure gauges typically can only withstand a limited range of overpressure. Once the pressure exceeds their designed safety range, the diaphragm will be over-extended, resulting in significant deformation. If the diaphragm is exposed to this high pressure for an extended period (such as during extended maintenance after a device failure), the spring inside the pressure gauge will be subjected to continuous stress, resulting in a large deformation position. If this is prolonged, it can lead to material fatigue, plastic deformation, or even fracture, resulting in loss of elasticity and ultimately damage to the diaphragm. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide an over-high pressure diaphragm pressure gauge to solve the problem in the prior art that the diaphragm of the diaphragm pressure gauge is easily damaged when subjected to high pressure beyond the measuring range.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention discloses an ultra-high pressure diaphragm pressure gauge, comprising an upper gauge head assembly, a middle diaphragm assembly and a lower connecting assembly connected in sequence, wherein the middle diaphragm assembly comprises a middle flange, a middle connecting pipe is provided in the middle of the upper surface of the middle flange, a middle receiving groove is provided on the lower surface of the middle flange, one end of the middle connecting pipe is communicated with the middle receiving groove, the other end of the middle connecting pipe is connected to the upper gauge head assembly, a diaphragm is provided on the other end of the middle receiving groove, a working fluid is provided in the middle receiving groove, an elastic membrane is provided between the working fluid and the diaphragm, the elastic membrane separates the working fluid and the diaphragm, and the middle diaphragm is provided with a plurality of connecting pipes. A first flow channel and a second flow channel are symmetrically provided on the flange, one end of the first flow channel is communicated with the cavity formed between the elastic membrane and the diaphragm, the other end of the first flow channel is communicated with the upper surface of the middle flange, and the two ends of the second flow channel are arranged through the upper surface and the lower surface of the middle flange, the upper end of the second flow channel is provided with a sleeve, the lower end of the sleeve is fixed on the middle flange, and the second flow channel is communicated with the interior of the sleeve, a piston is provided in the sleeve, and a limit spring is provided between the piston and the upper end of the sleeve, and a connecting pipe is provided on the upper part of the sleeve, and the connecting pipe connects the upper end of the first flow channel with the upper part of the sleeve;

[0007] The lower connecting assembly includes a lower flange, a lower connecting pipe is provided on the lower surface of the lower flange, and a lower accommodating groove is provided on the upper surface of the lower flange, which is arranged opposite to the middle accommodating groove. One end of the lower connecting pipe is connected to the lower accommodating groove, and the other end of the lower connecting pipe is connected to the conveying pipe. A third flow channel is symmetrically provided on the lower accommodating groove, one end of the third flow channel is connected to the lower accommodating groove, and the other end of the third flow channel is connected to the lower end of the second flow channel. The middle flange and the lower flange are connected by a plurality of bolts.

[0008] The top end of the lifting plate is fixedly mounted on the support frame, and the other end of the lifting plate is fixedly mounted on the support frame.

[0009] Furthermore, a fixed plate is provided above the rotating shaft, the middle part of the fixed plate is fixed on the outer surface of the middle connecting pipe, the fixed plate is provided with a first stopper, one end of the first stopper is vertically fixed to the fixed plate, a second stopper is provided on the rotating shaft, one end of the second stopper is vertically fixed to the rotating shaft, and a column is provided on the middle flange. When the rotating shaft drives the second stopper to rotate from the contact position with the end of the column to the contact position with the first stopper, the rotation angle of the baffle is 90°.

[0010] Furthermore, a return spring is provided on the fixed plate, one end of the return spring is fixed on the fixed plate, and a pull rope is provided on the other end of the return spring, one end of the pull rope is fixed to the other end of the return spring, and the other end of the pull rope is fixed to the lower surface of the second stopper, and a guide plate is provided on the pull rope, one end of the guide plate is slidably connected to the pull rope, and the other end of the guide plate is fixed on the surface of the middle flange.

[0011] Furthermore, a protective cover is provided on the middle diaphragm assembly, one end of the protective cover is detachably connected to the edge of the middle flange, and the upper end of the middle connecting pipe passes through the middle of the other end of the protective cover.

[0012] Furthermore, a rubber sealing ring is provided on the edges of the contact surfaces of the middle flange and the lower flange.

[0013] Furthermore, a drainage pipe is provided on the upper portion of the sleeve.

[0014] The beneficial effects of the present invention are:

[0015] In the present technical solution, when the delivery pressure of the medium is too large and exceeds the limit value that the diaphragm can withstand, the medium will enter the second flow channel from the third flow channel and then push the piston in the sleeve to overcome the elastic force of the limit spring and move upward. That is, during the movement, the piston moves to the upper part of the connecting tube, that is, the medium will enter the middle receiving groove through the connecting tube, that is, the entering medium will enter between the elastic membrane and the diaphragm, and apply a downward pressure to the diaphragm, thereby reducing the pressure difference between the upper and lower surfaces of the diaphragm, thereby reducing the deformation of the diaphragm, thereby avoiding the problem of damage to the diaphragm's performance such as rebound caused by long-term large deformation of the diaphragm.

[0016] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the purpose, technical solutions and beneficial effects of the present invention more clear, the present invention provides the following drawings for illustration:

[0018] Figure 1 It is a schematic front view of the super-high pressure diaphragm pressure gauge of the present invention;

[0019] Figure 2 It is a partial three-dimensional schematic diagram of an ultra-high pressure diaphragm pressure gauge of the present invention;

[0020] Figure 3 This is a schematic diagram of an internal cross-sectional view of an ultra-high pressure diaphragm pressure gauge of the present invention;

[0021] Figure 4 It is a three-dimensional schematic diagram of the middle diaphragm assembly of the ultra-high pressure diaphragm pressure gauge of the present invention;

[0022] Figure 5 A three-dimensional schematic diagram of the middle diaphragm assembly of the ultra-high pressure diaphragm pressure gauge of the present invention from another perspective;

[0023] Figure 6 For the present invention Figure 3 A local enlarged schematic diagram of point A in the middle.

[0024] The following are marked in the accompanying drawings:

[0025] 1. Upper gauge assembly; 2. Middle diaphragm assembly; 210. Middle receiving groove; 211. Elastic membrane; 212. Second flow channel; 213. First flow channel; 214. Piston; 215. Limit spring; 216. Sleeve; 217. Sliding rod; 218. Connecting pipe; 219. Connecting plate; 220. Traction rope; 221. Winding reel; 222. Rotating shaft; 223. Second stopper; 224. Column; 225. Baffle; 226 , working fluid; 227, fixed plate; 228, return spring; 229, pull rope; 230, guide plate; 231, middle connecting pipe 231; 232, middle flange; 233, diaphragm; 234, drain pipe; 235, first stopper; 3, lower connecting assembly; 310, lower flange; 311, lower receiving groove; 312, third flow channel; 313, lower connecting pipe; 314, bolt; 315, medium; 4, protective cover. DETAILED DESCRIPTION

[0026] like Figures 1 to 6 As shown, the present invention is an ultra-high pressure diaphragm pressure gauge, including an upper header assembly 1, a middle diaphragm assembly 2 and a lower connecting assembly 3 connected in sequence. It should be noted that the upper header connecting assembly is a prior art, and specifically includes the following components, including a spring tube, a pull rod, a gear transmission amplification mechanism, a pointer and a dial, a housing and connecting parts. The spring tube serves as a core elastic element and transmits a pressure signal by deformation. The pull rod transmits its deformation to the gear transmission amplification mechanism. The amplified signal drives the pointer to display the pressure value on the dial. The housing is used to protect the internal parts and prevent external interference. The connecting part ensures the sealing and stable connection between the header and the diaphragm body and other components. These parts work together to achieve accurate measurement and clear display of pressure, which will not be elaborated here. The purpose of the middle diaphragm assembly 2 is to separate the working fluid 226 and the conveying medium 315 through the diaphragm, and the purpose of the connecting assembly is to connect the header assembly and the diaphragm assembly to the conveying pipeline.

[0027] Specifically, in the present technical solution, the middle diaphragm assembly 2 includes a middle flange 232, a middle connecting pipe 231 is provided in the middle of the upper surface of the middle flange 232, and a middle receiving groove 210 is provided on the lower surface of the middle flange 232. One end of the middle connecting pipe 231 is communicated with the middle receiving groove 210, and the other end of the middle connecting pipe 231 is connected to the upper header assembly 1, and the connection method can be a threaded connection; a diaphragm 233, such as a stainless steel diaphragm 233, is provided on the other end of the middle receiving groove 210. Of course, in order to realize the installation of the diaphragm 233, it should also include a diaphragm body in the prior art for fixing the diaphragm 233 and providing a sealed connection with the measured medium 315; the middle receiving groove 210 is filled with a working fluid 226 (silicone oil or glycerin), and an elastic membrane 211 is provided between the working fluid 226 and the diaphragm 233. The elastic membrane 211 separates the working fluid 226 and the diaphragm 233 is separated, and a first flow channel 213 and a second flow channel 212 are symmetrically provided on the middle flange 232. One end of the first flow channel 213 is communicated with the cavity formed between the elastic membrane 211 and the diaphragm 233, that is, the working fluid 226 will not enter the first flow channel 213, and the other end of the first flow channel 213 is communicated with the upper surface of the middle flange 232. Both ends of the second flow channel 212 are arranged through the upper and lower surfaces of the middle flange 232. A sleeve 216 is provided at the upper end of the second flow channel 212, and the lower end of the sleeve 216 is fixed on the middle flange 232. The second flow channel 212 is communicated with the interior of the sleeve 216. A piston 214 is provided in the sleeve 216. A limit spring 215 is provided between the piston 214 and the upper end of the sleeve 216. A connecting pipe 218 is provided on the upper part of the sleeve 216. The connecting pipe 218 connects the upper end of the first flow channel 213 with the upper part of the sleeve 216.

[0028] The lower connecting assembly 3 includes a lower flange 310, the lower surface of the lower flange 310 is provided with a lower connecting pipe 313, the upper surface of the lower flange 310 is provided with a lower accommodating groove 311 arranged opposite to the middle accommodating groove 210, one end of the lower connecting pipe 313 is connected to the lower accommodating groove 311, and the other end of the lower connecting pipe 313 is connected to the conveying pipeline, and a third flow channel 312 is symmetrically provided on the lower accommodating groove 311, one end of the third flow channel 312 is connected to the lower accommodating groove 311, and the other end of the third flow channel 312 is connected to the lower end of the second flow channel 212, and the middle flange 232 and the lower flange 310 are connected by a plurality of bolts 314.

[0029] The working principle of the above technical solution to achieve over-high voltage protection is:

[0030] Normal pressure detection principle: The medium 315 in the conveying pipeline enters the lower receiving tank 311 through the lower connecting pipe 313, squeezing the diaphragm 233. The diaphragm 233 transmits the pressure to the working fluid 226 by deforming, which in turn squeezes the working fluid 226 into the upper head assembly 1, causing the upper head assembly 1 to operate and display the pressure value.

[0031] The working principle of over-high pressure protection is as follows: when the delivery pressure of the medium 315 is too large and exceeds the limit value of the normal deformation range that the diaphragm 233 can withstand, the medium 315 will enter the second flow channel 212 from the third flow channel 312 and then push the piston 214 in the sleeve 216 to overcome the elastic force of the limit spring 215 and move upward, that is, during the movement, the piston 214 moves to the upper part of the connecting pipe 218, that is, at this time the medium 315 will pass through the connecting pipe 218 into the middle receiving groove 210, that is, the entered medium 315 will enter between the elastic membrane 211 (which can be understood as the material of the balloon, of course, an anti-corrosion coating should also be provided, and it itself is not subject to much pressure) and the diaphragm 233. Since the diaphragm 233 has reached In the extreme deformation position during normal measurement, it cannot exert a greater deformation pressure on the working fluid 226. Therefore, the pressure between the elastic membrane 211 and the diaphragm 233 is less than the pressure of the medium 315. Therefore, the high-pressure medium 315 can enter between the two, that is, the entering medium 315 fills the gap between the elastic membrane 211 and the diaphragm 233 and exerts a downward pressure on the diaphragm 233, thereby reducing the pressure difference between the upper surface and the lower surface of the diaphragm 233. As a result, the diaphragm 233 can recover a certain deformation under the action of its own elasticity, thereby reducing the deformation of the diaphragm 233, thereby avoiding the problem of the diaphragm 233 being in the extreme deformation position for a long time, which may cause damage to the performance of the diaphragm 233 such as rebound.

[0032] When the pressure of the medium 315 decreases, the limit spring 215 will drive the piston 214 to move downward in the sleeve 216 and return to its initial position. During the downward movement of the piston 214, the working fluid 226 entering the upper header assembly 1 will flow back, thereby driving the elastic membrane 211 to reset. During the reset process, it will contact the diaphragm 233 and the inner wall of the middle receiving groove 210, thereby squeezing the medium 315 out of the middle receiving groove 210 and discharging it into the sleeve 216 (of course, the negative pressure during the reset process of the piston 214 will also assist in extracting the entering medium 315). That is, after the discharge is completed, the diaphragm 233 and the upper header assembly 1 can perform normal pressure monitoring operations again.

[0033] It is not difficult to understand that Figure 3In the figure, the volumes of components such as the middle holding tank 210 and the lower holding tank 311 are drawn relatively large in order to make the drawings look more intuitive and clear. In actual production, the volumes of various components and features can be set to be relatively small. Therefore, the amount of medium 315 entering the middle holding tank 210 should also be small, and the subsequent discharge is also easier. Even if the discharge is not clean and there is a small amount of residue in the first flow channel 213, it will not cause a large error in the pressure monitoring result, and it can be used in an environment that allows a certain monitoring error. It should also be noted that in this solution, pressure monitoring is achieved by deforming the diaphragm 233 to contact and squeeze the working fluid 226 to transmit pressure, that is, it is less affected by the outside air, and the working fluid 226 is isolated by the elastic membrane 211, that is, the working When pressurized, the working fluid 226 does not enter the first flow channel 213. Even under compression, a small amount of the working fluid 226 drives the elastic membrane 211 to deform toward the first flow channel 213. Due to the small diameter of the first flow channel 213, this does not cause a significant pressure relief effect. Furthermore, a sealed environment is maintained between the elastic membrane 211 and the upper gauge assembly 1, which does not cause the pressure state after the vacuum injection of the working fluid 226 into the upper gauge assembly 1 to be relieved (of course, the upper gauge assembly 1 should also be provided with a channel for injecting the working fluid 226, etc., which will not be described in detail here). This does not affect measurement accuracy, and therefore measurement errors are relatively small. Any errors that may exist are also compensated and eliminated during pressure gauge calibration, thereby improving detection accuracy. Of course, if impurities such as solid particles are present in the medium 315, a filter or other component must be provided before entering the third flow channel 312. This will not be described in detail here.

[0034] In one practicable manner, a drain pipe 234 is provided at the upper portion of the sleeve 216. First, when the piston 214 moves upward, air can be discharged outward from the drain pipe 234 to avoid the piston 214 compressing the air and causing a large resistance to upward movement. At the same time, the medium 315 in the sleeve 216 can be discharged outward through the drain pipe 234. Of course, a part of the medium 315 flows outward by itself, and the remaining part only needs to be squeezed and pushed upward by the upward movement of the piston 214 when high pressure occurs next time, so that the medium 315 remaining in the sleeve 216 can be discharged from the drain pipe 234. It is not difficult to understand that the cavity between the initial position of the piston 214 and the end of the connecting tube 218 should be sufficient to completely accommodate the volume of the medium 315 entering the middle holding tank 210. No further details will be given here. It is not difficult to understand that a control valve or a one-way valve can be provided on the discharge pipe 234 to ensure that the pressure inside the sleeve 216 is balanced after the piston is reset, and no negative pressure or positive pressure is generated. Of course, whether the pressure inside the sleeve 216 needs additional control can be determined according to the actual situation during design and debugging. This is common knowledge known to those skilled in the art and will not be described in detail here.

[0035] In one practicable manner, a slide rod 217 is provided in the sleeve 216, one end of the slide rod 217 is fixed to the piston 214, and the other end of the slide rod 217 is slidably connected to the middle of the upper end of the sleeve 216, and a connecting plate 219 is provided on the other end of the slide rod 217, and one end of the connecting plate 219 is fixed to the slide rod 217. A baffle 225 is provided inside the middle connecting pipe 231, and the baffle 225 matches the inside of the middle connecting pipe 231. A rotating shaft 222 is provided on the side of the baffle 225, and one end of the rotating shaft 222 is fixed to the baffle 225. The other end of the plate 225 passes through the middle connecting tube 231, and the rotating shaft 222 is rotatably connected to the middle connecting tube 231. The other end of the rotating shaft 222 is provided with a winding wheel 221, and a traction rope 220 is wound around the winding wheel 221. One end of the traction rope 220 is fixed on the winding wheel 221, and the other end of the traction rope 220 is fixed on the connecting plate 219. When the piston 214 drives the slide rod 217 to move vertically, the connecting plate 219 drives the traction rope 220 to move, and then drives the baffle 225 to flip over to seal the internal cavity of the middle connecting tube 231.

[0036] The working principle of the above technical solution is:

[0037] When the piston 214 moves upward, it will drive the slide rod 217 to move upward, and then drive the connecting plate 219 to move upward, and then the connecting plate 219 drives the traction rope 220 to move, and then pulls the winding wheel 221 to rotate, and then drives the rotating shaft 222 to rotate, and then the internal baffle 225 to flip 90°, and then the edge of the baffle 225 contacts and seals with the inner wall of the middle connecting tube 231, and then the internal channel of the middle connecting tube 231 is closed, thereby preventing the high pressure transmitted by the high-pressure medium 315 through the diaphragm 233, or the high pressure exerted by the medium 315 entering the middle holding tank 210 from acting on the working fluid 226 in the middle connecting tube 231, resulting in excessive pressure transmitted to the upper header assembly 1, resulting in the problem of precision components in the upper wall header assembly being damaged by high pressure. Similarly, when the piston 214 is reset, the traction rope 220 loses its force on the winding wheel 221, and in the process of the working fluid 226 moving down and resetting, it will push the baffle 225 to flip and reset, thereby driving the rotating shaft 222 to rotate, and then driving the winding wheel 221 to rotate, and then the winding wheel 221 will wrap the slack traction rope 220 around it and the winding wheel 221 to facilitate the next rotation of the winding wheel 221. Of course, it is not difficult to understand that when the medium 315 enters the middle accommodating groove 210, the baffle 225 should be flipped into place, that is, the piston 214 just passes the end of the connecting pipe 218, so that when the medium 315 enters from the connecting pipe 218, the baffle 225 will close the middle connecting pipe 231. This method can avoid the problem of the pressure after the medium 315 enters acting on the inside of the upper head assembly 1 through the working fluid 226 by sealing in advance.

[0038] It should be noted that the traction rope 220 is wound on the winding wheel 221, and the force of the traction rope 220 is used to drive the winding wheel 221 to rotate, and the technical solution of controlling the rotation direction of the winding wheel 221 is common knowledge well known to technical personnel in this field. In order to improve the effect of winding the loose traction rope 220 thereon when the winding wheel 221 is reversed and reset, a baffle can be set or the length of the winding wheel 221 can be increased, that is, to prevent the traction rope 220 from escaping from the winding area of ​​the winding wheel 221; at the same time, the shape and setting method of the baffle 225 flipping to block the middle connecting pipe 231 can refer to the butterfly valve control on-off technology in the prior art, and will not be elaborated here.

[0039] It should also be noted that certain sealing measures should be taken for the connecting parts between the slide rod 217 and the end of the sleeve 216, and between the rotating shaft 222 and the middle connecting tube 231, such as the mechanical sealing technology, packing sealing technology and floating spring sealing technology in the prior art. For example, reference can be made to the sealing technology of the propeller rotating shaft 222 in the prior art, and no further details will be given here.

[0040] In one practicable manner, a fixed plate 227 is provided above the rotating shaft 222, the middle portion of the fixed plate is fixed to the outer surface of the middle connecting pipe 231, a first stopper 235 is provided on the fixed plate 227, one end of the first stopper 235 is vertically fixed to the fixed plate 227, a second stopper 223 is provided on the rotating shaft 222, one end of the second stopper 223 is vertically fixed to the rotating shaft 222, a column 224 is provided on the middle flange 232, when the rotating shaft 222 drives the second stopper 223 from being aligned with the column When the end contact position of 224 rotates to the contact position with the first stop block 235, the rotation angle of the baffle 225 is 90°. That is, with this setting, the rotation angle of the baffle 225 can be accurately controlled by the column 224 and the first stop block 235, thereby improving the sealing effect of the middle connecting tube 231. Of course, the length of the traction rope 220 can also be used for control, but the traction rope 220 may be deformed after use, which may easily lead to the problem that the baffle 225 cannot be flipped into place.

[0041] In one practicable manner, a return spring 228 is provided on the fixed disk 227, one end of the return spring 228 is fixed to the fixed disk 227, a pull rope 229 is provided on the other end of the return spring 228, one end of the pull rope 229 is fixed to the other end of the return spring 228, the other end of the pull rope 229 is fixed to the lower surface of the second stopper 223, a guide plate 230 is provided on the pull rope 229, one end of the guide plate 230 is slidably connected to the pull rope 229, and the other end of the guide plate 230 is fixed to the surface of the middle flange 232. When the rotating shaft When 222 rotates, it drives the second stop block 223 to rotate, and then the pull rope 229 drives the return spring 228 to deform. Then, when the piston 214 is reset, the return spring 228 can drive the rotating shaft 222 to reset, and then drive the baffle 225 to flip to a vertical state. At the same time, under the elastic force of the return spring 228, the position of the baffle 225 can be maintained during normal operation, thereby preventing the baffle 225 from being pushed to flip by the working fluid 226 to block the channel inside the middle connecting pipe 231, resulting in the problem of reducing the flow space of the working fluid 226.

[0042] In one embodiment, a protective cover 4 is provided over the central diaphragm assembly 2. One end of the protective cover 4 is detachably connected to the edge of the central flange 232. The upper end of the central connecting tube 231 extends through the center of the other end of the protective cover 4, enhancing the appearance while protecting the internal components. A rubber sealing ring is provided at the contact edge between the central flange 232 and the lower flange 310 to prevent leakage.

[0043] It is not difficult to understand that in the present technical solution, the piston 214 can also be pushed by the medium 315 to compress the air above the piston 214 into the middle receiving groove 210 for pressure compensation (of course, there is no need to set up a drain pipe 234 in this method), and there is no need for the medium 315 to enter the middle receiving groove 210. This method can also achieve the effect of reducing the pressure difference on the two sides of the diaphragm 233, thereby reducing the deformation. This method compresses the upper air, so the sealing requirements of the sliding parts of the slide rod 217 and the sleeve 216 are relatively high. Different design methods can be selected according to the use pressure. When selecting this method, it is only necessary to design the connection height of the connecting pipe 218 and the sleeve 216 and the elastic force of the limit spring 215, which will not be elaborated here.

[0044] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. An ultra-high pressure diaphragm pressure gauge, comprising an upper gauge head assembly (1), a middle diaphragm assembly (2) and a lower connection assembly (3) connected in sequence, characterized in that: The middle diaphragm assembly (2) includes a middle flange (232), a middle connecting pipe (231) is provided in the middle of the upper surface of the middle flange (232), a middle receiving groove (210) is provided on the lower surface of the middle flange (232), one end of the middle connecting pipe (231) is communicated with the middle receiving groove (210), and the other end of the middle connecting pipe (231) is connected to the upper header assembly (1), a diaphragm (233) is provided on the other end of the middle receiving groove (210), a working fluid (226) is provided in the middle receiving groove (210), an elastic membrane (211) is provided between the working fluid (226) and the diaphragm (233), and the elastic membrane (211) separates the working fluid (226) and the diaphragm (233), a first flow channel (213) and a second flow channel (212) are symmetrically provided on the middle flange (232), and the first flow channel ( One end of the first flow channel (213) is communicated with the cavity formed between the elastic membrane (211) and the diaphragm (233), the other end of the first flow channel (213) is communicated with the upper surface of the middle flange (232), the two ends of the second flow channel (212) are arranged through the upper surface and the lower surface of the middle flange (232), the upper end of the second flow channel (212) is provided with a sleeve (216), the lower end of the sleeve (216) is fixed on the middle flange (232), and the second flow channel (212) is communicated with the interior of the sleeve (216), a piston (214) is provided in the sleeve (216), a limit spring (215) is provided between the piston (214) and the upper end of the sleeve (216), a connecting pipe (218) is provided on the upper part of the sleeve (216), and the connecting pipe (218) connects the upper end of the first flow channel (213) and the upper part of the sleeve (216); The lower connecting assembly (3) includes a lower flange (310), a lower connecting pipe (313) is provided on the lower surface of the lower flange (310), a lower receiving groove (311) is provided on the upper surface of the lower flange (310) and is arranged opposite to the middle receiving groove (210), one end of the lower connecting pipe (313) is communicated with the lower receiving groove (311), and the other end of the lower connecting pipe (313) is communicated with the delivery pipeline, a third flow channel (312) is symmetrically provided on the lower receiving groove (311), one end of the third flow channel (312) is communicated with the lower receiving groove (311), and the other end of the third flow channel (312) is communicated with the lower end of the second flow channel (212), and the middle flange (232) and the lower flange (310) are connected by a plurality of bolts (314).

2. The ultra-high pressure diaphragm pressure gauge according to claim 1, characterized in that: A slide rod (217) is provided in the sleeve (216), one end of the slide rod (217) is fixed on the piston (214), and the other end of the slide rod (217) is slidably connected to the middle of the upper end of the sleeve (216). A connecting plate (219) is provided on the other end of the slide rod (217), and one end of the connecting plate (219) is fixed on the slide rod (217). A baffle (225) is provided inside the middle connecting pipe (231), and a rotating shaft (222) is provided on the side of the baffle (225). One end of the rotating shaft (222) is fixed on the baffle (225), and the other end of the baffle (225) passes through the middle connecting pipe (231). The rotary shaft (222) is rotatably connected to the middle connecting tube (231), the other end of the rotary shaft (222) is provided with a winding wheel (221), a traction rope (220) is wound around the winding wheel (221), one end of the traction rope (220) is fixed to the winding wheel (221), and the other end of the traction rope (220) is fixed to the connecting plate (219), when the piston (214) drives the sliding rod (217) to move vertically, the connecting plate (219) drives the traction rope (220) to move, and then drives the baffle (225) to flip to block the internal cavity of the middle connecting tube (231).

3. The over-high pressure diaphragm pressure gauge according to claim 2, characterized in that: A fixed plate (227) is provided above the rotating shaft (222), the middle portion of the fixed plate is fixed to the outer surface of the middle connecting pipe (231), a first stopper (235) is provided on the fixed plate (227), one end of the first stopper (235) is vertically fixed to the fixed plate (227), a second stopper (223) is provided on the rotating shaft (222), one end of the second stopper (223) is vertically fixed to the rotating shaft (222), a column (224) is provided on the middle flange (232), and when the rotating shaft (222) drives the second stopper (223) to rotate from a contact position with the end of the column (224) to a contact position with the first stopper (235), the rotation angle of the stopper (225) is 90°.

4. The over-high pressure diaphragm pressure gauge according to claim 3, characterized in that: The fixed disk (227) is provided with a return spring (228), one end of the return spring (228) is fixed on the fixed disk (227), the other end of the return spring (228) is provided with a pull rope (229), one end of the pull rope (229) is fixed to the other end of the return spring (228), the other end of the pull rope (229) is fixed to the lower surface of the second stopper (223), the pull rope (229) is provided with a guide plate (230), one end of the guide plate (230) is slidably connected to the pull rope (229), and the other end of the guide plate (230) is fixed on the surface of the middle flange (232).

5. The ultra-high pressure diaphragm pressure gauge according to claim 1, characterized in that: The middle diaphragm assembly (2) is provided with a protective cover (4), one end of the protective cover (4) is detachably connected to the edge of the middle flange (232), and the upper end of the middle connecting pipe (231) passes through the middle of the other end of the protective cover (4).

6. The ultra-high pressure diaphragm pressure gauge according to claim 1, characterized in that: The edges of the contact surfaces of the middle flange (232) and the lower flange (310) are provided with rubber sealing rings.

7. The ultra-high pressure diaphragm pressure gauge according to claim 1, characterized in that: A liquid drain pipe (234) is provided on the upper portion of the sleeve (216).

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