Air cavity pressure monitoring device and method thereof

Abstract

The invention discloses an air cavity pressure monitoring device and method, and relates to the technical field of coal mine underground safety equipment, the air cavity pressure monitoring device comprises an explosion-proof device body and a pressure gauge used for monitoring the pressure of a high-pressure air cavity in the explosion-proof device body, and the explosion-proof device body is provided with an adapter pipe; the device further comprises a valve body, a pressure sensor, a valve needle seat and an inflation valve. The valve body is fixedly connected to the end of the adapter pipe, and three connectors are integrally arranged on the valve body and used for being connected with the pressure sensor, the inflation valve and the pressure gauge respectively. The valve needle structure is arranged and used for temporarily plugging the valve needle seat when the pressure gauge or the pressure sensor is detached and replaced, so that the valve body is isolated from the high-pressure gas cavity, leakage of the high-pressure gas cavity cannot be caused when the faulted pressure sensor or pressure gauge is replaced, the process of recharging high-pressure nitrogen is not needed, the process can be directly completed underground, and the operation is simple and convenient. The maintenance time, the labor intensity of personnel and the maintenance cost are greatly reduced, and the efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mine underground safety equipment, and particularly relates to a gas cavity pressure monitoring device and a method thereof. BACKGROUND

[0002] A coal mine underground explosion-proof device is a core device for ensuring safe operation of a mine, and its core function is to block energy transmission of an explosive gas (such as methane) when the explosive gas explodes in the device by physical isolation and pressure relief design, and to prevent secondary disasters from occurring. A high-pressure gas cavity in the device is a key safety component, and the gas pressure (usually maintained at 5-15 MPa) needs to be monitored in real time by a pressure sensor and a pressure gauge to ensure stable explosion-proof performance. The sealing property and pressure stability of the high-pressure gas cavity are directly related to the effectiveness of the explosion-proof device and the safety of underground operation.

[0003] When the pressure sensor or the pressure gauge of the explosion-proof device fails, the following maintenance process needs to be taken: first, stop the operation of the device, disassemble the failed instrument, and then replace the new instrument, re-install and calibrate it. However, since the high-pressure gas cavity of the existing mine explosion-proof device is usually directly connected to the pressure gauge and the sensor, once the pressure gauge or the sensor is damaged, the device needs to be disassembled. The disassembly operation needs to be strictly depressurized and the gas source needs to be cut off, and after installation is completed, the high-pressure nitrogen needs to be recharged. This process is time-consuming and labor-intensive, and increases the maintenance cost. Therefore, there is an urgent need for a device that can directly isolate the high-pressure gas cavity underground, replace the instrument and the pressure sensor without depressurization, to improve the maintenance efficiency and safety. SUMMARY

[0004] The purpose of the present application is to provide a gas cavity pressure monitoring device that can quickly isolate the high-pressure gas cavity and the pressure measuring cavity by the cooperative design of the valve needle and the multi-layer sealing assembly, support the online replacement of the pressure gauge and the sensor, and significantly reduce the maintenance cost and the operation risk.

[0005] To solve the above technical problems, the technical solution adopted by the present application is: The application discloses a kind of gas cavity pressure monitoring devices, including explosion-proof device body and for monitoring the pressure of high-pressure gas cavity inside explosion-proof device body pressure gauge, explosion-proof device body is equipped with adapter pipe;It further includes: valve body, pressure sensor, valve needle seat and inflation valve;Valve body is fixedly connected at the end of adapter pipe, three interfaces are integrally arranged on valve body, for connecting pressure sensor, inflation valve and pressure gauge respectively;Pressure sensor is used to collect the pressure signal inside valve body;Valve needle seat is fixedly connected on valve body and is penetrated, the head of valve needle seat is provided with internal thread groove, the middle part of valve needle seat is provided with through hole that is communicated with the inside of valve body, and the tail of valve needle seat is communicated with high-pressure gas cavity;Valve needle structure is inserted in the inside of valve needle seat, and valve needle structure includes screw rod, valve core rotatably connected at the end of screw rod and plug fixedly connected at the end of valve core, screw rod is connected by thread cooperation with internal thread groove, and the inside of valve needle seat is provided with plugging part for cooperating with plug, and the outer wall of valve core is fixedly connected with three sealing rings.

[0006] By setting the valve body integrated with three interfaces for installing pressure gauge, pressure sensor and inflation valve respectively, the valve body is communicated with the high-pressure gas cavity in the explosion-proof device body through valve needle seat and adapter pipe, so that the inside of valve body is equal to the pressure of high-pressure gas cavity, and the pressure gauge and pressure sensor indirectly reflect the pressure condition inside high-pressure gas cavity by monitoring the pressure data inside valve body.

[0007] Further improvement of the technical scheme of the application is that the inside of valve needle structure is provided with pressure relief hole, the pressure relief hole extends from the head of screw rod to the side of valve core, there are sealing rings on both sides of the port position of pressure relief hole on valve core, the head of screw rod is provided with mounting hole at the position of pressure relief hole, and filter tip is detachably connected in the inside of mounting hole.

[0008] By setting pressure relief hole on valve needle structure, and the one end of pressure relief hole is on the side wall of valve core, and the port position of pressure relief hole is completely opposite to the through hole in the state that plug blocks plugging part, when valve needle structure is rotated to the above state, the inside of valve body is communicated with external environment through pressure relief hole, so that the air pressure inside valve body is gradually discharged from pressure relief hole until completely released, so that the valve body is not hindered by pressure during dismounting and replacing operation, and the safety hazard caused by high-pressure environment is eliminated.

[0009] The further improvement of the technical scheme of the present application is that a tail portion of the valve needle seat is provided with a mounting groove, and a buffer air nozzle is fixedly connected inside the mounting groove, the buffer air nozzle comprises an outer cylinder and an inner cylinder fixedly connected inside the outer cylinder, a sound generating structure is fixedly connected inside the inner cylinder, the sound generating structure generates sound when air flows from one end to the other end, and the sound generating structure is a whistle.

[0010] By adopting the above technical scheme, the buffer air nozzle is arranged between the high-pressure air cavity and the valve body, and the sound generating structure is arranged in the inner cylinder for connecting the two, so that when air flows from the high-pressure air cavity to the inside of the valve body, the sound generating structure is triggered to generate sound.

[0011] The further improvement of the technical scheme of the present application is that a piston column is slidingly connected between the inner walls of the inner cylinder, a partition plate is fixedly connected between the inner walls of the inner cylinder, the partition plate and the piston column are directly fixedly connected with a spring, a slow-flow hole is arranged on the partition plate, and a strip-shaped groove is arranged on the side wall of the inner cylinder.

[0012] By adopting the above technical scheme, the piston column is arranged in the inner cylinder in a sliding manner, and the inner cylinder and the partition plate jointly form an incomplete piston cylinder, so that the air in the high-pressure air cavity does not directly pass through the inner cylinder, but pushes the piston column to move towards the partition plate and compresses the spring, and in the process, the air in the piston cylinder formed by the above-mentioned structure is squeezed out through the slow-flow hole, but the diameter of the slow-flow hole limits the speed of the air in the piston cylinder (the air flow is limited in speed), and the limited air flow is discharged into the valve body through the sound generating structure, so that the sound generating structure only passes through relatively moderate air flow, thereby avoiding damage of the sound generating structure caused by air flow; on the other hand, when the piston column is not moved, it blocks most of the area of the strip-shaped groove (the part of the area that is not blocked by the piston column can always pass air), and in the process of movement of the piston column, the piston column gradually unblocks the strip-shaped groove, so that the length of the strip-shaped groove for passing air gradually increases, and the speed of the air passing through the strip-shaped groove gradually increases, but not instantaneously, so as to avoid the influence of the suddenly increased air pressure on the sealing performance of the valve body.

[0013] The further improvement of the technical scheme of the present application is that the side wall of the piston column is fixedly connected with linkage members in a symmetrical manner, the linkage members are L-shaped, the ends away from the piston column are fixedly connected with a blocking block, and a slot matching the shape of the blocking block is arranged in the inside of the mounting groove; and the end of the plug away from the valve core is fixedly connected with a thimble.

[0014] By adopting the above technical scheme, the linkage members and the blocking block are arranged to move together with the piston column, and when leakage occurs, the blocking block can block the slot in the mounting groove, so as to prevent the air in the high-pressure air cavity from flowing to the valve body, thereby preventing continuous leakage of the air.

[0015] Further improvement of the technical scheme of the present application is that the pressure sensor and the pressure gauge are provided with hollow screws at one end of the valve body, the inner thread cylinder is fixedly connected inside the interface of the valve body for connecting the pressure sensor and the pressure gauge, the air hole is formed on the inner thread cylinder, the sealing gasket is fixedly connected to one side of the inner wall of the inner thread cylinder, the piston cavity is formed at the position of each interface of the valve body, the piston plate is slidably connected between the inner walls of the piston cavity, the lock pin is slidably connected to the side wall of the inner thread cylinder, the round head of the lock pin is provided at one end and extends into the inner thread cylinder, the annular groove is formed on the outer part of the hollow screw for cooperating with the lock pin, the end of the lock pin away from the annular groove extends into the inner part of the piston cavity and is fixedly connected with the piston plate, the sealing cover is fixedly connected to the opening part of the piston cavity, and the piston cavity and the sealing cover cooperate to form the closed chamber, and the connecting hole is formed between the piston cavity and the inner part of the valve body.

[0016] With the above technical scheme, under normal working condition, the valve body is in a high pressure state, the pressure enters the piston cavity through the connecting hole and drives the piston plate and the lock pin to move until the lock pin extends into the annular groove, and under the action of the high pressure, the round head of the lock pin abuts against the annular groove, so that the hollow screw cannot be easily screwed down due to the obstruction caused by the lock pin; when the air pressure in the valve body is exhausted, there is no air pressure to press the piston plate, so that in the process of screwing back the hollow screw, the round head (spherical in the perspective view) of the lock pin is pressed by the annular groove, so that the lock pin automatically retracts into the piston cavity, thereby avoiding hindering the disassembly of the hollow screw.

[0017] Further improvement of the technical scheme of the present application is that the tapered bellows is sleeved outside the valve needle structure, the adapter ring is fixedly connected to the inner wall of the narrow opening part of the tapered bellows, and the adapter ring is rotatably connected to the outer part of the screw rod of the valve needle structure, and the wide opening part of the tapered bellows is fixedly connected with the valve needle seat.

[0018] With the above technical scheme, the tapered bellows is sleeved outside the valve needle structure to protect the valve needle structure, thereby avoiding dust adhering to the valve needle structure, the narrow opening part of the tapered bellows is rotatably connected to the screw rod through the adapter ring, and the tapered bellows can be stretched and contracted, thereby avoiding interfering with or hindering the normal operation of the valve needle structure.

[0019] The present application also provides a gas cavity pressure monitoring method, comprising the following steps: S1: comparing the values of the pressure sensor and the pressure gauge, judging whether there is a fault between the two according to the value of the pressure gauge and the pressure data collected by the pressure sensor, and determining the object to be replaced; Through the redundancy design of simultaneously setting pressure gauges and pressure sensors, when the sensor is disabled due to circuit failure (such as short circuit), the pressure gauge can be used as a backup monitoring means (to avoid single point failure risk), when the pressure gauge is disabled due to mechanical jamming (such as deformation of the Bourdon tube), the sensor data provides cross verification, improves the reliability of monitoring, and the difference between the data comparison results of the two can be used to judge whether there is a failure of the monitoring means.

[0020] S2: Rotate the valve needle structure until the plug blocks the plugging part, so that the high-pressure gas cavity is separated from the valve body, and the gas pressure in the valve body is slowly released through the pressure relief hole; Before disassembling and replacing, the pressure in the valve body is released first, so as to avoid that the pressure extrusion of the connection part causes wear during disassembly, and reduce the safety hidden danger.

[0021] S3: Rotate the corresponding hollow screw head for the disassembling and replacing object to disassemble it, and install a new disassembling and replacing object; The disassembling and replacing object includes a pressure gauge and a pressure sensor.

[0022] S4: Rotate the valve needle structure until the sealing rings outside the two valve needle structures are on the same side of the through hole, so that the gas pressure in the high-pressure gas cavity enters the valve body; After the disassembling and replacing is completed, the valve body is connected with the high-pressure gas cavity, so that the monitoring operation can be performed.

[0023] S5: After the replacement is completed, whether the replacement is in place is judged according to whether the sound emitting structure emits sound; A special sound emitting structure is arranged to monitor whether the valve body leaks in real time.

[0024] Due to the adoption of the above technical scheme, the technical progress achieved by the present application relative to the prior art is: 1、The valve body integrated with three interfaces is arranged in the present application, which is used for installing a pressure gauge, a pressure sensor and an inflation valve respectively, the valve body is connected with the high-pressure gas cavity in the explosion-proof device body through a valve needle seat and an adapter pipe, so that the pressure inside the valve body is equal to the pressure of the high-pressure gas cavity, the pressure gauge and the pressure sensor indirectly reflect the pressure condition inside the high-pressure gas cavity by monitoring the pressure data inside the valve body, and the valve needle structure is arranged to temporarily block the valve needle seat when the pressure gauge or the pressure sensor is disassembled and replaced, so that the valve body is isolated from the high-pressure gas cavity, the replacement of the faulty pressure sensor or the pressure gauge will not cause the high-pressure gas cavity to leak, the process of recharging high-pressure nitrogen is not needed, and the process can be directly completed underground, which greatly reduces the maintenance time, the labor intensity of personnel and the maintenance cost, and improves the efficiency.

[0025] 2、The present application is characterized in that the relief hole is arranged on the valve needle structure, one end of the relief hole is arranged on the side wall of the valve core, and the opening of the relief hole is completely opposite to the through hole when the plug seals the sealing part, so that when the valve needle structure is rotated to the above state, the inside of the valve body is communicated with the outside environment through the relief hole, and the gas pressure in the valve body is gradually discharged from the relief hole until it is completely released, so that the valve body is not blocked by the pressure during the disassembly and replacement operation, and the safety hidden danger caused by high pressure environment is eliminated.

[0026] 3、The present application is characterized in that the buffer gas nozzle is arranged between the high-pressure gas cavity and the valve body, and the sound generating structure is arranged in the inner cylinder for communicating the two, so that when the gas flows from the high-pressure gas cavity to the inside of the valve body, the sound generating structure is triggered to emit sound, thereby warning the operator that the valve body sealing problem exists.

[0027] 4、The present application is characterized in that the piston column is arranged in the inner cylinder and is in sliding connection with the inner cylinder, and the inner cylinder and the partition plate together form an incomplete closed piston cylinder, so that the gas in the high-pressure gas cavity is not directly discharged through the inner cylinder, but pushes the piston column to move towards the partition plate and squeezes the spring, and in the process, the gas in the piston cylinder is squeezed out through the slow-flow hole, but the diameter of the slow-flow hole limits the speed of the gas in the piston cylinder, and the part of the limited gas flow is discharged into the valve body through the sound generating structure, so that the sound generating structure only passes through the relatively moderate gas flow, avoiding damage to the sound generating structure caused by the gas flow; during the movement of the piston column, the blocking of the strip-shaped groove is gradually released, so that the length of the strip-shaped groove for passing gas gradually increases, and the speed of the gas passing through gradually increases, but not instantaneously, so as to avoid the influence of the suddenly increased gas pressure on the sealing performance of the valve body.

[0028] 5、The present application is characterized in that the linkage and the plug are arranged to move with the piston column, and when leakage occurs, the plug can block the slot in the installation groove, thereby preventing the gas in the high-pressure gas cavity from flowing to the valve body, so as to prevent continuous leakage of the gas. BRIEF DESCRIPTION OF DRAWINGS

[0029] The present application will be further described below with reference to the accompanying drawings.

[0030] Figure 1 It is a structure schematic view of the first perspective of the whole application; Figure 2 It is a structure schematic view of the second perspective of the whole application; Figure 3 It is a sectional structure schematic view of the whole application; Figure 4 It is a sectional structure schematic view of the whole application; Figure 3 It is an enlarged view of A in the whole application; Figure 5 It is an installation structure schematic view of the valve body and the explosion-proof device body of the whole application; Figure 6 The exploded view of the whole structure of the application; Figure 7 The external view of the valve needle structure of the application; Figure 8 The exploded view of the valve needle seat and the buffer air nozzle of the application; Figure 9 The cross-sectional view of the buffer air nozzle of the application; Figure 10 The external view of the pressure gauge of the application; Figure 11 The exploded view of the buffer air nozzle of the application.

[0031] In the figure: 1, valve body; 11, pressure sensor; 12, inflation valve; 13, pressure gauge; 14, thimble; 15, adapter pipe; 2, interface; 3, buffer air nozzle; 31, outer cylinder; 32, inner cylinder; 33, sound-producing structure; 34, partition; 35, piston column; 36, spring; 37, strip-shaped slot; 38, linkage; 39, plug; 310, buffer hole; 4, valve needle structure; 41, screw rod; 42, valve core; 43, plug; 5, valve needle seat; 51, through hole; 52, plugging part; 53, slot; 54, mounting groove; 61, hollow screw head; 62, annular groove; 63, internally threaded cylinder; 64, gasket; 65, piston cavity; 66, piston plate; 67, lock pin; 68, connecting hole; 69, sealing cover; 7, pressure relief hole; 8, filter tip; 9, conical bellows. DETAILED DESCRIPTION

[0032] The application will be further described in detail below in combination with examples.

[0033] Example 1 As shown in Figure 1 and Figure 2 , the application provides a gas cavity pressure monitoring device, which comprises a flameproof device body and a pressure gauge 13 for monitoring the pressure of a high-pressure gas cavity inside the flameproof device body, and the flameproof device body is provided with an adapter pipe 15; further comprising: a valve body 1, a pressure sensor 11, a valve needle seat 5 and an inflation valve 12; as shown in Figure 4 、 Figure 7 and Figure 8As shown, the valve body 1 is fixedly connected to the end of the adapter pipe 15, and three interfaces 2 are integrally arranged on the valve body 1, which are respectively used for connecting the pressure sensor 11, the inflation valve 12 and the pressure gauge 13; the pressure sensor 11 is used for collecting the pressure signal inside the valve body 1; the valve needle seat 5 penetrates through and is fixedly connected to the valve body 1, the head of the valve needle seat 5 is provided with an internal thread groove, the middle part of the valve needle seat 5 is provided with a through hole 51 which is in communication with the inside of the valve body 1, and the tail of the valve needle seat 5 is in communication with the high-pressure gas cavity; the valve needle structure 4 is inserted into the inside of the valve needle seat 5, and the valve needle structure 4 comprises a screw rod 41, a valve core 42 rotatably connected to the end of the screw rod 41 and a plug 43 fixedly connected to the end of the valve core 42, the screw rod 41 is connected to the internal thread groove through thread cooperation, the inside of the valve needle seat 5 is provided with a plugging part 52 used in cooperation with the plug 43, and the outer wall of the valve core 42 is fixedly connected with three sealing rings.

[0034] In the embodiment, the valve body 1 integrated with three interfaces 2 is arranged for mounting the pressure gauge 13, the pressure sensor 11 and the inflation valve 12 respectively, the valve body 1 is in communication with the high-pressure gas cavity in the body of the explosion-proof device through the valve needle seat 5 and the adapter pipe 15, so that the inside of the valve body 1 is equal to the pressure of the high-pressure gas cavity, the pressure gauge 13 and the pressure sensor 11 indirectly reflect the pressure condition inside the high-pressure gas cavity by monitoring the pressure data inside the valve body 1; and the valve needle structure 4 is arranged for temporarily plugging the valve needle seat 5 when the pressure gauge 13 or the pressure sensor 11 is replaced, so that the valve body 1 is isolated from the high-pressure gas cavity, and the replacement of the faulty pressure sensor 11 or pressure gauge 13 will not cause the leakage of the high-pressure gas cavity, and the process of recharging high-pressure nitrogen is not needed, and the process can be directly completed underground, which greatly reduces the maintenance time, labor intensity and maintenance cost of personnel, and improves the efficiency; The redundant design of simultaneously arranging the pressure gauge 13 and the pressure sensor 11 is adopted in the monitoring means, when the sensor fails due to circuit failure (such as short circuit), the pressure gauge 13 can be used as a backup monitoring means (to avoid the risk of single point failure), when the pressure gauge 13 fails due to mechanical jamming (such as deformation of the Bourdon tube), the sensor data provides cross verification, improves the reliability of monitoring, and the pressure gauge 13 can be used for on-site observation, and the data collected by the pressure sensor 11 can be transmitted through the signal transceiver so as to be remotely monitored.

[0035] When the pressure sensor 11 or the pressure gauge 13 is damaged, the valve needle structure 4 is moved to the deep part of the valve needle seat 5 by rotating the screw rod 41, the valve core 42 and the plug 43 are moved until the plug 43 blocks the blocking part 52, meanwhile, the part between the through hole 51 and the blocking part 52 in the valve needle seat 5 is blocked by the valve core 42, the valve core 42 is provided with a sealing ring, so that the gas pressure in the high-pressure cavity is not leaked to the inside of the valve body 1, when the pressure gauge 13 or the pressure sensor 11 is removed, the high-pressure nitrogen in the high-pressure cavity is not released, and after replacement, the gas pressure in the high-pressure cavity is equal to the valve body 1 by reversing the screw rod 41 to reset the valve core 42 and the plug 43. It should be particularly pointed out that the valve core 42 is provided with three sealing rings outside, when the valve body 1 is in communication with the high-pressure cavity (normal use), the three sealing rings are located on the side of the through hole 51 away from the blocking part 52, and two of the sealing rings are tightly attached to the inside of the valve needle seat 5, and the other sealing ring is located in the internal thread groove; when the valve body 1 is blocked with the high-pressure cavity (replacement operation), two of the sealing rings are located on the side of the through hole 51 close to the blocking part 52, and the other sealing ring is located on the side of the through hole 51 away from the blocking part 52, and the three sealing rings are tightly attached to the inside of the valve needle seat 5, so that the high-pressure cavity is blocked with the valve body 1, and the valve body 1 is blocked with the external environment.

[0036] Embodiment 2 As shown in Figure 1 , Figure 3 and Figure 4 , on the basis of embodiment 1, the application provides a technical solution: preferably, the inside of the valve needle structure 4 is provided with a pressure relief hole 7, the pressure relief hole 7 extends from the head of the screw rod 41 to the side of the valve core 42, the two sides of the opening position of the pressure relief hole 7 on the valve core 42 are provided with sealing rings, the head of the screw rod 41 is provided with a mounting hole at the position of the pressure relief hole 7, and the inside of the mounting hole is detachably connected with a filter tip 8.

[0037] In the above-mentioned solution, when the pressure gauge 13 or the pressure sensor 11 is replaced, the plug 43 is needed to block the blocking part 52 first, but the inside of the valve body 1 still maintains a high-pressure state after blocking, the connection part between the pressure gauge 13 or the pressure sensor 11 and the valve body 1 is tightly pressed by the gas pressure, the screwing-down process has a large resistance, and the threaded connection part is greatly worn, in addition, if the gas pressure in the valve body 1 is not completely released at the moment when the structure to be replaced is screwed down, the structure will be quickly pushed out, which has a safety hazard; In the embodiment, by starting the pressure relief hole 7 on the valve needle structure 4, and the pressure relief hole 7 is at one end of the side wall of the valve core 42, the mouth position is completely opposite to the through hole 51 in the state that the plug 43 blocks the plugging part 52, so that when the valve needle structure 4 is rotated to the above state, the inside of the valve body 1 is communicated with the outside environment through the pressure relief hole 7, so that the gas pressure in the valve body 1 is gradually discharged from the pressure relief hole 7 to the outside until it is completely released, so that when the disassembly operation is performed, it will not be hindered by the pressure resistance, and the safety hidden danger brought by the high pressure environment is eliminated; wherein the mouth position of the pressure relief hole 7 is connected with the filter tip 8 through threaded connection, so as to prevent external dust from entering the pressure relief pipe. It should be particularly pointed out that when the plug 43 approaches the plugging part 52 and has not yet contacted the plugging part 52, the valve core 42 entering the valve needle seat 5 can already block the high-pressure gas cavity from the valve body 1, so that even if the plug 43 does not contact the plugging part 52, the high-pressure nitrogen gas in the high-pressure gas cavity will not leak to the valve body 1 without leakage.

[0038] Embodiment 3 As Figure 4 , Figure 9 and Figure 11 indicated, on the basis of embodiment 2, the application provides a technical solution: preferably, the tail part of the valve needle seat 5 is provided with a mounting groove 54, the inside of the mounting groove 54 is fixedly connected with a buffer air nozzle 3, the buffer air nozzle 3 includes an outer cylinder 31 and an inner cylinder 32 fixedly connected inside the outer cylinder 31, the inside of the inner cylinder 32 is fixedly connected with a sound generating structure 33, the sound generating structure 33 emits sound when the gas flows from one end to the other end, and the sound generating structure 33 is a whistle.

[0039] Because frequent disassembly at the same time can easily lead to sealing failure and increase the risk of leakage, but the prior art lacks automatic detection function, that is, manual detection is needed after each disassembly is completed to determine whether the installation is in place, so that the disassembly operation is extremely cumbersome, and the operation amount is large and the operation efficiency is low; In the embodiment, by setting the buffer air nozzle 3 between the high-pressure gas cavity and the valve body 1, and setting the sound generating structure 33 in the inner cylinder 32 for communication between the two, when the gas flows from the high-pressure gas cavity to the inside of the valve body 1, the sound generating structure 33 is triggered to emit sound; Specifically, when the rotating valve needle structure 4 makes the plug 43 block the blocking part 52, at this time, due to the fact that the gas pressure in the high-pressure cavity cannot enter the valve body 1 through the valve needle seat 5, there will be no gas flow through the buffer gas nozzle 3, so as not to make a sound (i.e. the disassembly and replacement operation state will not make a sound); in the monitoring state, since the valve body 1 is in communication with the high-pressure cavity, the gas pressures are equal, and there is also no gas flow, so there will be no sound; only when the plug 43 is separated from the blocking part 52 by operating the valve needle structure 4 after the disassembly and replacement is completed, in the process that the high-pressure nitrogen gas enters the valve body 1 from the high-pressure cavity, the gas flow passes through the buffer gas nozzle 3, so that the sound generating structure 33 makes a sound, and it needs to be particularly pointed out that the sound generated by the sound generating structure 33 only exists in the above-mentioned short process, so when the sound generating structure 33 only makes a sound for a short time, it indicates that there is no problem with the sealing after the disassembly and replacement, and if the sound is continuous, it indicates that there is a problem with the sealing (i.e. when the sealing of the disassembly and replacement part is poor, gas will leak, causing the gas in the high-pressure cavity to continuously flow to the valve body 1, so that the sound generating structure 33 continuously makes a sound).

[0040] Embodiment 4 As shown in Figure 4 , Figure 9 and Figure 11 , on the basis of embodiment 3, the application provides a technical solution: preferably, the inner wall of the inner cylinder 32 is slidingly connected with the piston column 35, the inner wall of the inner cylinder 32 is fixedly connected with the partition plate 34, the partition plate 34 is directly fixedly connected with the spring 36 through the piston column 35, the partition plate 34 is provided with the buffer flow hole 310, and the side wall of the inner cylinder 32 is provided with the strip-shaped groove 37.

[0041] Since in the present scheme, when the pressure gauge 13 (or the pressure sensor 11) is replaced, the valve body 1 needs to be separated from the high-pressure cavity first, and then connected after the replacement is completed, at the moment of connection, a huge gas pressure will suddenly flow into the valve body 1, causing the valve body 1 to suddenly suffer a severe gas pressure impact, thereby affecting the sealing of the connected gap and the structure of the valve body 1 (such as explosion caused by a sudden impact of a large gas pressure); and the sound generating structure 33 (a whistle is arranged on the gas flow channel) in the buffer gas nozzle 3 will also be damaged by the sudden impact; In the embodiment, the inner cylinder 32 and the partition plate 34 jointly form an incomplete piston cylinder, and the piston column 35 is arranged in the inner cylinder 32 and is in sliding connection with the inner cylinder 32. The gas in the high-pressure gas cavity does not directly pass through the inner cylinder 32, but pushes the piston column 35 to move towards the partition plate 34 and squeezes the spring 36. In the process, the gas in the piston cylinder is squeezed out through the slow-flow hole 310, but the gas cannot be quickly discharged (limited speed) due to the aperture limitation of the slow-flow hole 310. The limited gas flow is discharged into the valve body 1 through the sound generating structure 33, so that the sound generating structure 33 only passes through the relatively moderate gas flow, and damage of the sound generating structure 33 caused by the gas flow is avoided. On the other hand, when the piston column 35 is not moved, the piston column 35 blocks most of the area of the strip-shaped groove 37 (the area of the strip-shaped groove 37 is not always blocked, and the area can always flow gas). In the movement process of the piston column 35, the blocking of the strip-shaped groove 37 is gradually released, so that the length of the strip-shaped groove 37 for passing gas gradually increases, and the speed of the gas passing through gradually increases, but is not instantaneously increased, so as to avoid the influence of the suddenly increased gas pressure on the sealing performance of the valve body 1.

[0042] As shown in Figure 4 , Figure 9 and Figure 11 , preferably, the side wall of the piston column 35 is fixedly connected with linkage members 38 in a symmetrical manner. The linkage members 38 are L-shaped, and the ends away from the piston column 35 are fixedly connected with blocking blocks 39. The inner part of the mounting groove 54 is provided with notches 53 matched with the shapes of the blocking blocks 39. The end away from the valve core 42 of the plug 43 is fixedly connected with the thimble 14.

[0043] In the daily work process, the interfaces 2 of the valve body 1 may be leaked (for example, improper disassembly and replacement operation does not appear leakage on the spot, but appears leakage after a period of use). However, the operator cannot be present near the device at all times. Once the leakage occurs, if not handled in time, the gas will soon leak out; In the embodiment, the linkage members 38 and the blocking blocks 39 can move with the piston column 35. When the leakage occurs, the blocking blocks 39 can block the notches 53 in the mounting groove 54, so as to prevent the gas in the high-pressure gas cavity from flowing to the valve body 1, thereby preventing the continuous leakage of the gas; Specifically, when the high-pressure cavity normally fills the valve body 1 with gas, the piston rod 35 moves towards the baffle 34 until the pressure inside the valve body 1 is equal to that of the high-pressure cavity. This process only lasts for a very short time, and when the pressure inside the high-pressure cavity is equal to that of the valve body 1, the piston rod 35 slowly returns to its original position under the action of the spring 36, without continuously moving the piston rod 35 to drive the linkage 38 and the plug 39 to block the slot 53. However, if there is a leak, the piston rod 35 will continuously move until the plug 39 blocks the slot 53 through the linkage 38, and after blocking, the plug 39 will always be in the position of the slot 53 due to the high pressure inside the high-pressure cavity and the valve body 1 (leakage state). The slot 53 has a section with a diameter greater than that of the inner wall of the outer cylinder 31. When there is no sealing problem, the movement range of the plug 39 is always in this section of the slot 53, and it will not affect the gas flow rate of the slot 53. However, if the plug 39 continues to move until it leaves this area (valve body 1 leaks), the gas flow rate of the slot 53 will decrease until the plug 39 blocks the slot 53.

[0044] It should be noted that the plug 39 cannot automatically reset after blocking the slot 53, so the valve needle structure 4 is provided with a thimble 14 at the end of the plug 43 to push the plug 39 back to its original position. First, the above-mentioned leakage of the valve body 1 only occurs when the plug 43 does not block the sealing part 52, so the thimble 14 will not hinder the movement of the plug 39 until it blocks the slot 53. Second, after blocking, it means that the valve body 1 is leaking, and the pressure data collected by the pressure gauge 13 and the pressure sensor 11 are both zero, which requires maintenance. Therefore, the valve needle needs to be operated until the plug 43 blocks the sealing part 52, and during this process, the thimble 14 will push the plug 39 to move until it is completely reset. At this time, the sealing structure is switched from the plug 39 to the plug 43 (the state becomes the state when the pressure gauge 13 is replaced), and the operation does not increase, and the normal rotation of the screw rod 41 is still possible, which facilitates maintenance operations.

[0045] Example 5 As Figure 5 , Figure 6 and Figure 10As shown, on the basis of embodiment 4, the application provides a technical scheme: preferably, the pressure sensor 11 and the pressure gauge 13 are provided with a hollow screw head 61 close to one end of the valve body 1, and an internal thread cylinder 63 is fixedly connected inside the interface 2 of the valve body 1 for connecting the pressure sensor 11 and the pressure gauge 13, the internal thread cylinder 63 is provided with a gas hole, a sealing gasket 64 is fixedly connected to one side of the inner wall of the internal thread cylinder 63, the valve body 1 is provided with a piston cavity 65 at the position of each interface 2, a piston plate 66 is slidingly connected between the inner walls of the piston cavity 65, a locking pin 67 is slidingly connected to the side wall of the internal thread cylinder 63, one end of the locking pin 67 is provided with a round head and extends into the internal thread cylinder 63, the external of the hollow screw head 61 is provided with an annular groove 62 for cooperating with the locking pin 67, the end of the locking pin 67 away from the annular groove 62 extends into the internal of the piston cavity 65 and is fixedly connected with the piston plate 66, and the mouth position of the piston cavity 65 is fixedly connected with a sealing cover 69, and the piston cavity 65 and the sealing cover 69 cooperate to form a closed chamber, and the connecting hole 68 is provided between the piston cavity 65 and the internal of the valve body 1.

[0046] The above operation needs to first separate the valve body 1 from the high-pressure gas cavity, and then release the internal gas pressure of the valve body 1 before disassembling and replacing, and during the operation process, in order to avoid misoperation (disassembly under high pressure), in this embodiment, the locking pin 67 is also provided, under normal working condition, the valve body 1 is in a high-pressure state, the pressure enters the piston cavity 65 through the connecting hole 68, and drives the piston plate 66 and the locking pin 67 to move, until the locking pin 67 extends into the annular groove 62, and under the above high pressure, the round head of the locking pin 67 abuts against the annular groove 62, so that the hollow screw head 61 is prevented from being easily rotated and removed by the locking pin 67; When the internal gas pressure of the valve body 1 is exhausted, there is no gas pressure to extrude the piston plate 66, so during the process of rotating the hollow screw head 61 to retreat, the annular groove 62 extrudes the round head (spherical in the perspective view) of the locking pin 67, so that the locking pin 67 automatically retracts into the piston cavity 65, thereby not hindering the disassembly of the hollow screw head 61.

[0047] As shown in Figure 5 , Figure 6 and Figure 8 , preferably, the valve needle structure 4 is sleeved with a conical bellows 9, the narrow inner wall of the conical bellows 9 is fixedly connected with an adapter ring, the adapter ring is rotatably connected to the outside of the screw rod 41 of the valve needle structure 4, and the wide mouth of the conical bellows 9 is fixedly connected with the valve needle seat 5.

[0048] Because there is a lot of dust in the coal mine underground environment, and the valve needle structure 4 and the mouth of the valve needle seat 5 are connected by threads, and the screw rod 41 of the valve needle is exposed to the environment during normal operation, dust will directly adhere to the threads, and when maintenance is performed, it will be screwed into the inner thread groove, and the above-mentioned dust will be brought into the thread gap during the screwing-in process, thereby causing mechanical wear and affecting the service life of the device. Therefore, in the present embodiment, the valve needle structure 4 is protected by sleeving a conical bellows 9 outside the valve needle structure 4 to avoid dust adhering to the valve needle structure 4, and the narrow mouth of the conical bellows 9 is rotationally connected with the screw rod 41 through an adapter ring (which is relatively harder than the conical bellows 9), and it can be stretched and contracted, so as not to interfere with or hinder the normal operation of the valve needle structure 4.

[0049] The application also provides a gas cavity pressure monitoring method, comprising the following steps: S1: Compare the values of the pressure sensor 11 and the pressure gauge 13, and determine whether there is a fault between the two according to the value of the pressure gauge 13 and the pressure data collected by the pressure sensor 11 to determine the replacement object; By simultaneously providing the pressure gauge 13 and the pressure sensor 11, when the sensor fails due to circuit failure (such as short circuit), the pressure gauge 13 can be used as a backup monitoring means (to avoid single-point failure risk), and when the pressure gauge 13 fails due to mechanical jamming (such as deformation of the Bourdon tube), the sensor data provides cross verification to improve the reliability of the monitoring, and the difference between the two data comparison results can be used to determine whether there is a monitoring means failure.

[0050] S2: Rotate the valve needle structure 4 until the plug 43 blocks the sealing part 52, so that the high-pressure gas cavity is separated from the valve body 1, and the internal pressure of the valve body 1 is slowly released through the pressure relief hole 7; The internal pressure of the valve body 1 is released before replacement to avoid pressure extrusion of the connection part, thereby reducing the safety hazard.

[0051] S3: Rotate the corresponding hollow screw head 61 to remove it, and install a new replacement object; Among them, the replacement object includes the pressure gauge 13 and the pressure sensor 11.

[0052] S4: Rotate the valve needle structure 4 until the two sealing rings outside the valve needle structure 4 are on the same side of the through hole 51, so that the internal pressure of the high-pressure gas cavity enters the internal part of the valve body 1; After the replacement is completed, the valve body 1 is connected with the high-pressure gas cavity, so that the monitoring operation can be performed.

[0053] S5: After replacement, whether the sound emitting structure 33 emits sound is judged to determine whether the replacement is in place. If the sound emitting structure 33 emits sound for a short time and then stops, it indicates that the sealing is good. If the sound emitting structure 33 emits sound for a long time, it indicates that there is a sealing problem in the replaced connection position. A special sound emitting structure 33 is arranged to monitor whether the valve body 1 leaks in real time.

[0054] The above has generally described the present application in detail, but some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, the modifications or improvements without departing from the spirit of the present application are within the protection scope of the present application.

Claims

1. A gas cavity pressure monitoring device, comprising an explosion-proof device body and a pressure gauge (13) for monitoring the pressure of a high-pressure gas cavity inside the explosion-proof device body, wherein the explosion-proof device body is equipped with a transfer pipe (15); characterized in that, Also includes: Valve body (1), pressure sensor (11), valve needle seat (5) and inflation valve (12); The valve body (1) is fixedly connected to the end of the adapter pipe (15). The valve body (1) is provided with three interfaces (2), which are used to connect the pressure sensor (11), the inflation valve (12) and the pressure gauge (13), respectively. The pressure sensor (11) is used to collect the pressure signal inside the valve body (1); The valve needle seat (5) is connected to the valve body (1) through and fixedly connected. The head of the valve needle seat (5) is provided with an internal thread groove. The middle part of the valve needle seat (5) is provided with a through hole (51) communicating with the inside of the valve body (1). The tail of the valve needle seat (5) is connected to the high-pressure air chamber. The valve needle structure (4) is inserted into the valve needle seat (5). The valve needle structure (4) includes a screw (41), a valve core (42) rotatably connected to the end of the screw (41), and a plug (43) fixedly connected to the end of the valve core (42). The screw (41) is connected to the internal thread groove by thread engagement. The valve needle seat (5) is provided with a sealing part (52) for use with the plug (43). The outer wall of the valve core (42) is fixedly connected with three sealing rings. The valve needle seat (5) has an installation groove (54) at its tail end. A buffer nozzle (3) is fixedly connected inside the installation groove (54). The buffer nozzle (3) includes an outer cylinder (31) and an inner cylinder (32) fixedly connected inside the outer cylinder (31). A sound-generating structure (33) is fixedly connected inside the inner cylinder (32). The sound-generating structure (33) emits sound when the airflow flows from one end to the other. A piston column (35) is slidably connected between the inner walls of the inner cylinder (32), and a partition plate (34) is fixedly connected between the inner walls of the inner cylinder (32). A spring (36) is directly fixedly connected between the partition plate (34) and the piston column (35). A slow flow hole (310) is provided on the partition plate (34), and a strip groove (37) is provided on the side wall of the inner cylinder (32).

2. The air chamber pressure monitoring device according to claim 1, characterized in that: The valve needle structure (4) has a pressure relief hole (7) inside. The pressure relief hole (7) extends from the head of the screw (41) to the side of the valve core (42). There are sealing rings on both sides of the opening of the pressure relief hole (7) on the valve core (42). The head of the screw (41) has an installation hole at the location of the pressure relief hole (7). A filter (8) is detachably connected inside the installation hole.

3. The air chamber pressure monitoring device according to claim 2, characterized in that: The piston column (35) is symmetrically fixedly connected with a linkage (38). The linkage (38) is L-shaped, and a block (39) is fixedly connected to one end away from the piston column (35). The mounting groove (54) has a slot (53) inside that matches the shape of the block (39). The end of the plug (43) away from the valve core (42) is fixedly connected with a pin (14).

4. The air chamber pressure monitoring device according to claim 3, characterized in that: The pressure sensor (11) and pressure gauge (13) are both equipped with hollow screw heads (61) at the ends near the valve body (1). An internally threaded cylinder (63) is fixedly connected inside each interface (2) on the valve body (1) used to connect the pressure sensor (11) and pressure gauge (13). An air hole is provided on the internally threaded cylinder (63). A sealing gasket (64) is fixedly connected to one side of the inner wall of the internally threaded cylinder (63). A piston chamber (65) is provided at each interface (2) on the valve body (1). A piston plate (66) is slidably connected between the inner walls of the piston chambers (65). The internally threaded cylinder (63)... A locking pin (67) is slidably connected to the side wall. One end of the locking pin (67) is rounded and extends into the interior of the internal threaded cylinder (63). An annular groove (62) is provided on the outside of the hollow screw head (61) to cooperate with the locking pin (67). The end of the locking pin (67) away from the annular groove (62) extends into the interior of the piston chamber (65) and is fixedly connected to the piston plate (66). A sealing cover (69) is fixedly connected to the opening of the piston chamber (65). The piston chamber (65) and the sealing cover (69) cooperate to form a sealed chamber. A connecting hole (68) is provided between the piston chamber (65) and the interior of the valve body (1).

5. The air chamber pressure monitoring device according to claim 4, characterized in that: The valve needle structure (4) is fitted with a tapered bellows (9). A transition ring is fixedly connected to the inner wall of the narrow opening of the tapered bellows (9). The transition ring is rotatably connected to the outside of the screw (41) of the valve needle structure (4). The wide opening of the tapered bellows (9) is fixedly connected to the valve needle seat (5).

6. A method for monitoring air cavity pressure, characterized in that, The air chamber pressure monitoring device described in any one of claims 1-5 is applicable. Includes the following steps: S1: Compare the values ​​of pressure sensor (11) and pressure gauge (13), and determine whether there is a fault in either of them based on the value of pressure gauge (13) and the pressure data collected by pressure sensor (11), and determine the object to be replaced; S2: Rotate the valve needle structure (4) until the plug (43) blocks the sealing part (52), so that the high pressure air chamber is separated from the valve body (1), and the air pressure inside the valve body (1) is slowly released through the pressure relief hole (7); S3: Rotate the corresponding hollow screw head (61) to remove the object to be replaced and install the new object to be replaced; S4: Rotate the valve needle structure (4) until the sealing rings outside the two valve needle structures (4) are on the same side of the through hole (51), so that the air pressure inside the high pressure chamber enters the valve body (1); S5: After the replacement is completed, judge whether the replacement is in place based on whether the sound-producing structure (33) makes a sound.

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