CN114812978A - Valve leakage detection device with variable measuring range - Google Patents
Valve leakage detection device with variable measuring range Download PDFInfo
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- CN114812978A CN114812978A CN202210516386.6A CN202210516386A CN114812978A CN 114812978 A CN114812978 A CN 114812978A CN 202210516386 A CN202210516386 A CN 202210516386A CN 114812978 A CN114812978 A CN 114812978A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2876—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for valves
Abstract
The invention discloses a valve leakage detection device with variable measuring range, which comprises a leakage detection pipeline 6, wherein the leakage detection pipeline 6 comprises an expandable section 24, a reducing pipeline 23, an outer wall part and a supporting pipeline 19; the expandable section 24 includes a flexible cloth 242 and a movable metal plate 241; the metal plate 241 is wrapped inside by the flexible cloth 242, so that the gas is prevented from leaking when entering the reducing pipeline 23; the reducing pipeline 23 comprises an upper support 32, a lower support 33 and movable blades 34, wherein a protruding round pin is arranged on the upper support 32 to drive the movable blades 34 to move, and a square groove is formed in the lower support 33 to enable the movable blades 34 to rotate around the square groove. The same detection equipment can realize the detection of leakage quantity with larger change and different gas leakage. The leakage medium flow is small, the flow speed is low, when the leakage medium flow is lower than the lower limit of the measurement of a measuring instrument, the problem that measuring devices such as an anemometer are difficult to test occurs, the flow speed is increased by reducing the flow area, and therefore the tiny leakage amount is accurately measured.
Description
Technical Field
The invention relates to the field of leakage detection, in particular to a variable-range valve leakage detection device.
Background
The valve is used as a control part in an oil and gas conveying system and has the functions of stopping, adjusting, guiding, stabilizing pressure, shunting, overflowing and relieving pressure and the like. In the process of oil and gas transportation, the leakage of the valve is very common, so that waste can be caused at a low cost, and serious consequences can be caused at a high cost. The natural gas is a necessity in the life of residents, and has the characteristics of being toxic, inflammable, explosive and the like. When natural gas leaks, carbon monoxide is volatilized, so that people feel dizzy and nausea, and can be poisoned and killed in serious cases. While carbon monoxide is itself a combustible gas, the greater the leakage in air, the higher the chance of fire. When the amount of natural gas leakage reaches a certain level, a highly dangerous explosion behavior may occur. Therefore, the leakage detection of such gases is an indispensable link in production.
For valve leaks that may occur, most of the methods used are dwell tests. The general pressure maintaining test is to connect a pump or a compressor at one end of the system, such as a valve flange, to pump a medium into the system, and close a cut-off valve after reaching a preset pressure. And then reading the reading from the pressure gauge after the time required by the specification to see whether the reduction is within a reasonable range. The testing process of the method needs a long time, the measured pressure precision is not high, the valve leakage rate is difficult to quantitatively determine, and the detection accuracy of the tiny leakage rate needs to be improved.
Disclosure of Invention
The invention provides a valve leakage detection device with variable measuring range, which comprises a device which is simple to manufacture, can change the diameter steplessly to enable the flow velocity of leaked gas to meet the measuring range of an anemometer, can detect the leakage of different devices, and has wide application range.
The technical scheme of the invention is as follows:
a valve leakage detection device with variable measuring range comprises a leakage detection pipeline 6, wherein the leakage detection pipeline 6 comprises an expandable section 24, a reducing pipeline 23, an outer wall part and a supporting pipeline 19; the expandable section 24 includes a flexible cloth 242 and a movable metal plate 241; the metal plate 241 is wrapped inside by the flexible cloth 242, so that the gas is prevented from leaking when entering the reducing pipeline 23; the reducing pipeline 23 comprises an upper support 32, a lower support 33 and movable blades 34, wherein a raised round pin is arranged on the upper support 32 to drive the movable blades 34 to move, and a square groove is formed on the lower support 33 to enable the movable blades 34 to rotate around the square groove; the middle of the movable vane 34 is provided with an outer rib plate 38, the upper end surface of the movable vane 34 is provided with a groove, a round pin of the upper support 32 is inserted into the groove and is used for driving the movable vane 34 to integrally rotate, the lower end surface of the movable vane is provided with a square protrusion which is inserted into a square groove of the lower support 33, and the movable vane 34 moves under the constraint of the square groove on the plate of the lower support 33; the outer side of the upper end surface of the movable vane is also provided with a hole and a large and small notch for placing a movable block 36, a pressure plate 35 and a spring 37; wherein the spring 37 is fixed in the notch of the movable blade, the movable block 36 is movably placed on the spring 37 in the notch, and the two pressing plates 35 are connected with the top of the blade by using bolts to limit the movable block 36 in the notch; wherein, the supporting plate of the reducing layer in the middle of the reducing pipeline is fixedly connected with the large bevel gear 22 for realizing real-time reducing.
The valve leakage detection device with the variable measuring range further comprises an air compressor 1, an air storage tank 2, a switch ball valve 3, a pressure stabilizing valve 4, a valve to be detected 5, a pressure regulating valve 7, a data acquisition board card 8 and a computer 9; the air compressor 1 is utilized to send a test medium into the measuring device, the pressure of the sent medium is controlled by the pressure adjusting part of the air storage tank 2, overlarge pressure during testing is avoided, meanwhile, the switch ball valve 3 controls the input of the medium, the pressure stabilizing valve 4 and the pressure adjusting valve 7 respectively control the inlet and outlet pressure of the valve to be tested, sensors 39 are respectively arranged on the front pipeline and the rear pipeline of the valve to be tested 5, the medium leakage rate is collected through the data collecting board card 8, and the detected leakage quantity value is displayed through the computer 9, so that the accurate leakage quantity value of the valve is determined.
In the valve leakage detection device with the variable range, the air storage tank 2 comprises a tank body and a control part for controlling the output pressure of the air compressor 1, and a detection window is arranged on the left side of the tank body, so that the air storage tank is convenient to overhaul; the control part comprises a piston upper stop baffle 10, a pressure relief valve 11, a cylinder 12, a piston 13, a piston lower stop plate 14, an access window baffle 15 and a gram head 16; the piston upper stop baffle 10 is an annular porous plate, the inner diameter of the annular porous plate is larger than the maximum size of the mass block, and the upper surface of the annular porous plate is provided with a small hole which is connected with the cylinder 12 through a bolt; the piston lower stop plate 14 is a porous plate, and the upper plate surface comprises a microswitch 18 for controlling the wind power compressor 1; wherein the set pressure can be varied by varying the weight of the mass; when the piston 13 moves downwards and touches the microswitch 18 on the lower stop plate 14, the wind compressor is controlled by the circuit to start working; when the piston 13 moves to the upper baffle position, the pressure in the gas tank is reduced by the relief valve 11. Meanwhile, the electric contact on the pressure release valve 11 moves to cut off the work of the wind compressor to control the pressure of the testing medium, and the damage to the testing device in the detection process is avoided.
In the valve leakage detection device with variable measuring range, the supporting pipeline 19 comprises supporting parts at two sides and a flexible pipe 21 with variable length in the middle, and the supporting parts at two sides support the reducing part and the impeller type anemometer inside; the support tube 19 is circular and is fitted with a bevel pinion 28.
In the variable-range valve leakage detection device, the outer wall pipeline 25 is connected with the expandable section 24 in a sealing way by using the sealing gasket 26, so that the air flow is prevented from leaking when entering the pipeline.
In the valve leakage detection device with variable range, the reducing pipeline 23 is welded with the movable metal plate 241 of the expandable section 24, the expandable section 24 and the reducing pipeline 23 at two ends form a Venturi tube structure, and the expandable section 24 of the metal plate 241 and the reducing pipeline 23 can be changed simultaneously; at the same time, the flexible cloth 242 restricts the moving range of the metal plate 241 to ensure that the outer wall portion is not affected when the pipes are in different diameters.
In the valve leakage detection device with variable measuring range, the movable blocks 36 on the end surfaces of the blades between the multiple sections of reducing pipelines 23 are propped against the tail parts of the adjacent movable blades under the action of the springs, so that air sealing is realized.
The valve leakage detection device with variable range is characterized in that the variable diameter pipeline 23 in the middle section is provided with a gear transmission mechanism, when the diameter of the pipeline is changed through gear transmission, power is transmitted to other layers through friction force between the head and the tail of each section of movable blades, and finally the whole variable diameter of the multi-section variable diameter pipeline 23 is realized at the same time.
The device for detecting leakage of a valve with variable range according to claim 1, wherein the spring 37 is directly welded to the blade 34 to ensure the amount of movement of the movable block 36 in the axial direction, and the plurality of springs 37 ensure the smooth operation of the movable block 36 to prevent the movable block from being stuck.
According to the valve leakage detection device with the variable measuring range, the pressure plate 35 is provided with the through hole, the end face of the notch of the blade 34 is also provided with the small hole, the small hole is connected through the bolt 10, the movable block 36 is ensured not to move in the radial direction, and meanwhile, the gas tightness is ensured.
In the valve leakage detection device with the variable measuring range, the upper support 32 is connected with the square groove on the rib plate 38 of the blade through the small round pin protruding from the end surface, so that the track and the synchronism of each blade in the rotation process are ensured.
In the valve leakage detection device with the variable range, the lower support 33 is connected with the small raised blocks on the rib plates 38 of the blades through the notches on the end surfaces, so that the rotating track and the synchronism of each blade are ensured.
The invention aims at the field of valve leakage detection, and solves the following problems:
1. the same detection equipment can realize the detection of leakage quantity with larger change and different gas leakage.
2. Aiming at the problems that when the valve has micro leakage, the flow rate of a leakage medium is small, the flow rate is low, and when the flow rate is lower than the lower limit of the measurement of a measuring instrument, the measurement of a metering device such as an anemometer is difficult to test, the flow rate is increased by reducing the flow area, so that the micro leakage can be accurately measured.
3. For different leakage quantity amplitude value change ranges are wide, the diameter of the variable-diameter part of the leakage detection pipeline is changed, and detection of different leakage quantity values of gas in a wide range is achieved.
4. For the transition requirements of different valves to be tested, the length of the leakage detection pipeline can be changed to meet the requirements of the transition section.
Drawings
Fig. 1 is an overall schematic view of a valve leakage detecting device with variable range.
FIG. 2 is a schematic view of an air reservoir
FIG. 3 is a partial cross-sectional view of the leak detection and an enlarged schematic view of the anemometer.
FIG. 4 is a schematic view of a leak detection section
FIG. 5 is a schematic view of a support conduit
FIG. 6 is a schematic view of a variable diameter pipeline
FIG. 7 is a schematic view of the upper and lower supports
FIG. 8 is a schematic view of a blade
FIG. 9 is a partial detail view of the air container
1-air compressor, 2-air storage tank, 3-switch ball valve, 4-pressure stabilizing valve, 5-valve to be tested, 6-leakage detection pipeline, 7-pressure regulating valve, 8-data acquisition board card, 9-computer, 10-piston upper stop baffle, 11-pressure relief valve, 12-cylinder, 13-piston, 14-piston lower stop baffle, 15-inspection window baffle, 16-Glan head, 17-tank, 18-microswitch, 19-supporting tube, 20-pipeline sealing element, 21-variable length hose, 22-large bevel gear, 23-variable diameter pipeline, 231-variable diameter pipeline head layer, 232-variable diameter pipeline intermediate layer, 233-variable diameter pipeline tail layer, 24-expandable section, 241-metal plate, 242-flexible cloth, 25-outer wall pipeline, 26-gasket, 27-cylindrical support, 28-bevel pinion, 29-anemometer, 30-bolt, 31-nut, 32-upper support, 33-lower support, 34-movable blade, 35-pressing sheet, 36-movable block, 37-spring, 38-external ribbed plate, 39-pressure sensor.
Detailed Description
The present invention will be described in detail with reference to specific examples.
As shown in fig. 1, the valve leakage detection device with variable range includes an air compressor 1, an air storage tank 2, a switching ball valve 3, a pressure stabilizing valve 4, a valve to be detected 5, a leakage detection pipeline 6, a pressure regulating valve 7, a data acquisition board card 8 and a computer 9.
The air tank 2 includes a tank body and a control portion for controlling the output pressure of the air compressor 1, as shown in fig. 2. The left side of the tank body is provided with a detection window, so that the gas storage tank is convenient to overhaul. The control part comprises a piston upper stop baffle 10, a pressure relief valve 11, a cylinder 12, a piston 13, a piston lower stop plate 14, an access window baffle 15 and a gram head 16. As shown in fig. 9, the piston upper stop baffle 10 is a ring-shaped porous plate, the inner diameter of which is larger than the maximum size of the mass block, and the upper surface of which is provided with small holes connected with the cylinder 12 through bolts. The piston lower stop plate 14 is a perforated plate, and the upper plate surface comprises a microswitch 18 for controlling the wind power compressor 1. Wherein the set pressure can be varied by varying the weight of the mass. When the piston 13 moves downwards to touch the micro switch 18 on the lower stop plate 14, the wind compressor is controlled to start to work through the circuit. When the piston 13 moves to the upper baffle position, the pressure in the gas tank is reduced by the relief valve 11. Meanwhile, the electric contact on the pressure release valve 11 moves to cut off the work of the wind compressor to control the pressure of the testing medium, and the damage to the testing device in the detection process is avoided.
Wherein the leak detection conduit 6 comprises an expandable section 24, a reducer conduit 23, an outer wall portion and a support conduit 19.
The expandable section 24 includes a flexible cloth 242 and a movable metal plate 241. The metal plate 241 is wrapped inside by the flexible cloth 242, so that the gas is prevented from leaking when entering the reducing pipeline 23. The integral contraction section and the expansion section are respectively welded with the left section and the right section of the reducing pipeline 23.
The reducing pipe 23 includes an upper support 32, a lower support 33, and movable blades 34 (fig. 6 shows eight movable blades), as shown in fig. 4 and 6. As shown in FIG. 7, the upper support 32 has a protruding round pin for driving the movable blade 34 to move, and the lower support 33 has a square groove for allowing the movable blade 34 to rotate around. The centers of the upper support 32 and the lower support 33 are both provided with through holes for accommodating and supporting the movable blades. The middle of the movable vane 34 is provided with an outer rib plate 38, the upper end surface of the movable vane 34 is provided with a groove, a round pin of the upper support 32 is inserted into the groove to drive the movable vane 34 to integrally rotate, the lower end surface of the movable vane is provided with a square protrusion which is inserted into a square groove of the lower support 33, and the movable vane 34 moves under the constraint of the square groove on the plate of the lower support 33. The outer side of the upper end surface of the movable vane is also provided with a hole and a large-small notch for placing the movable block 36, the pressure plate 35 and the spring 37. Wherein the spring 37 is welded into the slot of the moving blade, the moving block 36 is movably placed on the spring 37 in the slot, and the two pressing plates 35 are connected with the top of the blade by using bolts to limit the moving block 36 in the slot. The supporting plate of the diameter changing layer at the middle of the diameter changing pipeline is welded with the large bevel gear 22 to realize real-time diameter changing, as shown in fig. 6.
The outer wall portion comprises a sealing gasket 26 and an outer wall duct 25. The outer wall pipeline 25 is connected with the two expandable sections through the sealing gasket 26 to ensure that gas does not leak.
The support pipe 19 comprises support portions on both sides which support the variable diameter portion and the internal impeller anemometer, and a variable length hose 21 in the middle. The supporting pipe 19 is provided with a circular hole for mounting the bevel pinion 28 and is also provided with a sealing gasket with the same diameter, so that the sealing performance of the pipe is ensured. The length change of the variable diameter part can be realized by opening the pipeline sealing element 20 and adding one or more layers of variable diameter pipelines. Simultaneously, the length of the hose 21 is changed to be overlapped with that of the newly added variable diameter pipeline, the anemometer is ensured to be always positioned in the variable diameter part, and then the sealing element 20 is closed. The raised supports on the inner side of the pipeline support the whole variable diameter part, and the position of the variable diameter part is ensured not to be changed.
The implementation key points of the method for assembling the variable diameter part are as follows:
the connection of the outer wall conduit 25 to the expandable section 24 is sealed using a gasket seal 26 to ensure that the flow of gas into the conduit does not leak.
The reducing pipe 23 is welded with the movable metal plate 241 of the expandable section 24, as shown in fig. 3-4, the expandable section 24 and the reducing pipe 23 at both ends form a structure similar to a venturi tube, and the expandable section 24 of the metal plate 241 and the reducing pipe 23 can be changed simultaneously. At the same time, the flexible cloth 242 restricts the moving range of the metal plate 241 to ensure that the outer wall portion is not affected when the pipes are in different diameters. The movable blocks 36 on the end surfaces of the blades between the sections of the variable diameter pipelines 23 are propped against the tail parts of the adjacent movable blades under the action of the springs, so that air sealing is realized. The reducing pipeline 23 in the interlude is provided with gear drive, when changing the pipeline diameter size through gear drive, transmits power to other each layer through the frictional force between each section movable blade head and the tail, finally realizes the whole reducing simultaneously of multistage reducing pipeline 23.
The springs 37 are directly welded with the blades 34, so that the moving amount of the moving block 36 in the axial direction is guaranteed, and the plurality of springs 37 guarantee the stable operation of the moving block 36 and prevent the blocking.
The pressure plate 35 is provided with a through hole, the end surface of the notch of the blade 34 is also provided with a small hole, and the small hole is connected through the bolt 10, so that the movable block 36 is ensured not to move in the radial direction, and meanwhile, the gas tightness is ensured.
The upper support 32 is connected with the square groove on the rib plate 38 of the blade through a small round pin protruding from the end surface, so as to ensure the track and the synchronism of each blade during rotation.
The lower support 33 is connected with the small raised blocks on the rib plates 38 of the blades through the notches on the end surfaces, so that the rotating track and the synchronism of each blade are ensured.
The support pipe 25 supports the entire reducing pipe by the inner cylindrical support 27 shown in fig. 5, so that the reducing pipe does not move circumferentially during operation. Meanwhile, the supporting parts on the two sides support the anemometer inside the variable diameter pipeline, and the flow speed inside the pipeline is transmitted to the display end, so that the leakage rate of the whole pipeline can be determined.
The variable range detection device realized by the assembly method has the following variable range detection method:
the valve 5 to be tested is connected to the measuring device, as shown in fig. 1, the air compressor 1 is used for sending test media into the measuring device, the pressure of the sent media is controlled by the pressure adjusting part of the air storage tank 2, and overlarge pressure is avoided during testing. Meanwhile, the switch ball valve 3 controls the input of a medium, and the pressure stabilizing valve 4 and the pressure regulating valve 7 respectively control the inlet and outlet pressure of the valve to be tested. The sensors 39 are respectively arranged on the front pipeline and the rear pipeline of the valve 5 to be detected, the medium leakage rate is collected through the data collecting board card 8, and the detected leakage quantity value is displayed through the computer 9, so that the accurate leakage quantity value of the valve is determined.
When the leakage of the measured pipeline is large, the knob connected with the small bevel gear 28 is rotated to drive the small bevel gear 28 to rotate, the small bevel gear drives the large bevel gear, the large bevel gear 22 drives the upper support 32 of the middle layer 232 to start to rotate, the blades 34 are enabled to rotate and to move horizontally outwards, the diameter of the reducing pipeline 23 begins to be increased, and the internal flow area begins to be increased. The leakage amount can be obtained through the measurement value of the internal anemometer and the changed pipe diameter, and the requirement of common measurement is met.
The diameter change of the reducing pipeline 23 can be transmitted down layer by layer through the friction between the movable blades in the two sections of pipelines, and the diameter of the whole reducing pipeline 23 is ensured to be increased to the same value.
As the blades of the trailing layer 233 of the reducer pipe move outward, the metal plate 241 of the expandable section moves along with the blades, and the flexible cloth 242 wrapped on the expandable section is expanded. Similarly, the expandable section connected to the first layer 231 of the variable diameter pipe is expanded. Reduce the impact of gas to the pipeline, avoid producing gaseous turbulent flow.
Meanwhile, the movable block 36 on the end surface of the blade always props against the tail part of the movable blade in the previous layer due to the elastic force of the spring 37 in the whole moving process, so that the sealing performance of the whole pipeline in the moving process is ensured.
When the leakage rate in the measured pipeline is small, the knob connected with the small bevel gear 28 is reversely rotated to drive the small bevel gear to rotate, the large bevel gear drives the upper support of the middle layer to start rotating through bevel gear transmission, so that the blades move inwards in a translation manner, the internal flow area starts to be reduced, and the diameter of the reducing pipeline 23 starts to be reduced.
The diameter change of the reducing pipeline can be transmitted layer by layer through the friction between two layers of pipeline blades, and the pipeline diameter of the whole reducing pipeline 23 is ensured to be reduced to the same value. The leakage amount can be obtained through the measurement value of the internal anemometer and the changed pipe diameter, and the measurement requirement of the small leakage amount is met.
As the blades of the trailing layer reducer pipe 233 move inward, the metal strips 241 of the expandable section move in unison, retracting the flexible cloth 242 wrapped thereon. The expandable section associated with the first layer 231 is likewise retracted. Meanwhile, the movable block 36 on the end face of the blade is always propped against the blade of the previous layer in the whole moving process, so that the sealing performance of the whole pipeline in the moving process is ensured.
When the detected elements require different lengths of the transition straight pipelines, the pipeline sealing element 20 can be opened, and one or more layers of reducing pipelines can be added or detached. Meanwhile, the hose 21 changes the length of the hose to coincide with the new primary reducing pipeline, the length of the transition straight pipeline in the measuring device is ensured to meet the requirement, meanwhile, the anemometer is always positioned in the reducing part, and then the sealing element 20 is closed. The protruding supports on the inner side of the pipeline support the whole diameter-changing part, and the position of the diameter-changing part is ensured not to be changed.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (10)
1. The valve leakage detection device with the variable measuring range is characterized by comprising a leakage detection pipeline (6), wherein the leakage detection pipeline (6) comprises an expandable section (24), a reducing pipeline (23), an outer wall part and a supporting pipeline (19); the expandable section (24) comprises a flexible cloth (242) and a movable metal plate (241); the metal plate (241) is wrapped inside by the flexible cloth (242), so that gas is prevented from leaking when entering the reducing pipeline (23); the reducing pipeline (23) comprises an upper support (32), a lower support (33) and movable blades (34), wherein a raised round pin is arranged on a plate of the upper support (32) and used for driving the movable blades (34) to move, and a square groove is formed in a plate of the lower support (33) so that the movable blades (34) can rotate around the square groove; the middle of the movable blade (34) is provided with an outer rib plate (38), the upper end surface of the movable blade is provided with a groove, a round pin of the upper support (32) is inserted into the groove and is used for driving the movable blade (34) to integrally rotate, the lower end surface of the movable blade is provided with a square protrusion which is inserted into a square groove of the lower support (33), and the movable blade (34) moves under the constraint of the square groove on the plate of the lower support (33); the outer side of the upper end surface of the movable vane is also provided with a hole and a large and small notch for placing a movable block (36), a pressure plate (35) and a spring (37); wherein the spring (37) is fixed in the notch of the movable blade, the movable block (36) is movably placed on the spring (37) in the notch, and the two pressing plates (35) are connected with the top of the blade by using bolts so as to limit the movable block (36) in the notch; wherein, the supporting plate of the reducing layer in the middle of the reducing pipeline is fixedly connected with the large bevel gear (22) for realizing real-time reducing.
2. The valve leakage detection device with the variable range according to claim 1, further comprising an air compressor (1), an air storage tank (2), a switch ball valve (3), a pressure stabilizing valve (4), a valve to be detected (5), a pressure regulating valve (7), a data acquisition board card (8) and a computer (9); the air compressor (1) is utilized to send a test medium into the detection device, the pressure of the sent medium is controlled by the pressure adjusting part of the air storage tank (2), the overlarge pressure during testing is avoided, meanwhile, the ball valve (3) is switched on and off to control the input of the medium, the pressure stabilizing valve (4) and the pressure adjusting valve (7) respectively control the inlet and outlet pressure of a valve to be tested, sensors (39) are respectively arranged on the front pipeline and the rear pipeline of the valve to be tested (5), the medium leakage rate is collected through a data collecting board card (8), the detected leakage quantity value is displayed through a computer (9), and therefore the accurate leakage quantity value of the valve is determined.
3. The valve leakage detecting device with variable range according to claim 2, characterized in that the gas storage tank (2) comprises a tank body and a control part for controlling the output pressure of the air compressor (1), and the left side of the tank body is provided with a detection window for facilitating the maintenance of the gas storage tank; the control part comprises an upper piston stop plate (10), a pressure relief valve (11), a cylinder body (12), a piston (13), a lower piston stop plate (14), an access window baffle plate (15) and a gland head (16); the piston upper stop baffle (10) is an annular porous plate, the inner diameter of the annular porous plate is larger than the maximum size of the mass block, and the upper surface of the annular porous plate is provided with a small hole which is connected with the cylinder body (12) through a bolt; the piston lower stop plate (14) is a porous plate, and the upper plate surface comprises a microswitch (18) for controlling the wind power compressor (1); wherein the set pressure can be varied by varying the weight of the mass; when the piston (13) moves downwards and touches a microswitch (18) on the lower stop plate (14), the wind power compressor is controlled by a circuit to start working; when the piston (13) moves to the upper baffle position, the pressure in the air storage tank is reduced through the pressure relief valve (11); meanwhile, an electric contact on the pressure release valve (11) moves to cut off the work of the wind compressor to control the pressure of a testing medium, so that the damage to the testing device in the detection process is avoided.
4. The variable range valve leak detector of claim 1, wherein the support pipe (19) comprises two support portions supporting the variable diameter portion and the inner vane anemometer, and a middle variable length hose (21); the supporting pipeline (19) is provided with a circular hole for installing a small bevel gear (28).
5. The variable range valve leak detector of claim 1, wherein the outer wall conduit (25) is sealingly connected to the expandable section (24) using a gasket seal (26) to ensure that no leakage occurs when the gas flow enters the conduit.
6. The valve leakage detecting device with variable range according to claim 1, wherein the reducing pipe (23) is welded with the movable metal plate (241) of the expandable section (24), the expandable section (24) and the reducing pipe (23) at two ends form a venturi structure, and the expandable section (24) of the metal plate (241) and the reducing pipe (23) can be changed simultaneously; at the same time, the flexible cloth (242) restricts the moving range of the metal plate (241) to ensure that the outer wall part is not influenced when the pipelines are in different diameters.
7. The valve leakage detecting device with variable range according to claim 1, characterized in that the movable blocks (36) on the end surfaces of the blades between the variable diameter pipelines (23) are pressed against the tails of the adjacent movable blades under the action of springs to realize air-tight seal.
8. The valve leakage detection device with variable range according to claim 1, wherein the variable diameter pipeline (23) in the middle section is provided with a gear transmission mechanism, when the diameter of the pipeline is changed through gear transmission, power is transmitted to other layers through friction force between the head and the tail of each section of movable blade, and finally the whole variable diameter pipeline (23) with multiple sections of variable diameter pipelines is changed simultaneously.
9. The valve leakage detecting device with variable range according to claim 1, wherein the springs (37) are directly welded with the blades (34) to ensure the moving amount of the movable block (36) in the axial direction, and the plurality of springs (37) ensure the stable operation of the movable block (36) to prevent the movable block from being stuck.
10. The valve leakage detecting device with variable range according to claim 1, characterized in that the pressure plate (35) is provided with a through hole, the end surface of the notch of the blade (34) is also provided with a small hole, and the small hole is connected through the bolt (10) to ensure that the movable block (36) does not move in the radial direction and ensure the gas tightness.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210516386.6A CN114812978B (en) | 2022-05-12 | 2022-05-12 | Valve leakage detection device with variable measuring range |
| PCT/CN2022/099457 WO2023216364A1 (en) | 2022-05-12 | 2022-06-17 | Variable-range valve leakage detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210516386.6A CN114812978B (en) | 2022-05-12 | 2022-05-12 | Valve leakage detection device with variable measuring range |
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| CN114812978A true CN114812978A (en) | 2022-07-29 |
| CN114812978B CN114812978B (en) | 2023-02-17 |
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| CN202210516386.6A Active CN114812978B (en) | 2022-05-12 | 2022-05-12 | Valve leakage detection device with variable measuring range |
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| WO (1) | WO2023216364A1 (en) |
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| CN114812978B (en) | 2023-02-17 |
| WO2023216364A1 (en) | 2023-11-16 |
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