CN108507733B - Leakage detection equipment of natural gas ball valve - Google Patents
Leakage detection equipment of natural gas ball valve Download PDFInfo
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- CN108507733B CN108507733B CN201810746599.1A CN201810746599A CN108507733B CN 108507733 B CN108507733 B CN 108507733B CN 201810746599 A CN201810746599 A CN 201810746599A CN 108507733 B CN108507733 B CN 108507733B
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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
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Abstract
The invention discloses leakage detection equipment of a natural gas ball valve, which at least comprises a base and a driving cylinder, wherein the base comprises a bottom plate, a bottom plate and a fixing plate; a lower end cover is fixed on the upper side of the bottom plate, a ball valve positioning cylinder is vertically arranged on the upper side of the lower end cover, a lower sealing gasket is attached to the upper surface of the lower end cover positioned on the outer side of the ball valve positioning cylinder, an inflation inlet is formed in the lower end cover positioned on the inner side of the ball valve positioning cylinder, and the inflation inlet is connected with an external air source through an air pipe; the driving cylinder is inversely fixed on the upper side of the top plate, and the lower end of the piston rod is fixed with an upper end cover; an upper sealing gasket is attached to the lower surface of the upper end cover; be equipped with a first manometer on the upper end cover, the pressure measurement interface of first manometer communicates the lower surface of sealed pad to the upper seal through the inside air flue of upper end cover and upper seal pad, still includes a detachable and leaks test module outward. The invention provides the leakage detection equipment of the natural gas ball valve, which has high test efficiency, higher test precision and lower manufacturing cost.
Description
Technical Field
The invention relates to the technical field of ball valve leakage detection, in particular to leakage detection equipment of a natural gas ball valve.
Background
The prior common natural gas ball valve is a polyethylene ball valve, along with the rapid development of high polymer material science and technology, the pipeline field of China starts to push the production and application of 'replacing steel with plastic', and taking the urban gas field as a guide, buried polyethylene pipes and ball valves are greatly developed. Compared with the traditional metal ball valve, the polyethylene ball valve has the advantages of light weight, corrosion resistance, maintenance-free property, small operation torque, long service life and the like.
As a switch in the natural gas transportation process, the polyethylene ball valve has high requirements on the product quality of the polyethylene ball valve, and loss which is difficult to measure can be caused if gas leaks in the use process, so that the sealing performance test is an essential important link before the polyethylene ball valve leaves a factory.
The sealing performance test of the polyethylene ball valve mainly comprises an inner leakage test and an outer leakage test, wherein the inner leakage test is to judge whether gas in a cavity at one end of the ball valve leaks into a cavity at the other end when a valve core of the ball valve is closed; the so-called leak test is whether gas in the ball valve cavity leaks out from the valve stem.
The existing test method is as follows: clamping two ends of a sealing ball valve by using a force application device such as a jack or a hydraulic cylinder, closing a valve core of the ball valve when detecting the internal leakage of the ball valve, inflating and pressurizing a cavity at one end of the ball valve, connecting a cavity at the other end with an air outlet pipe, putting the cavity into water, observing whether bubbles are generated or not, and judging whether the internal leakage of the ball valve exists or not; when the ball valve leaks, open the ball valve case, inflate the pressurization toward the ball valve inner chamber, put into the pond with whole ball valve, observe whether there is the bubble production in ball valve rod department, judge whether the ball valve leaks outward. When the method is used for sealing performance test, because the two ends of the ball valve are extruded by force application devices such as a jack or a hydraulic cylinder, the axial stress of the ball valve is larger, the extrusion deformation of the polyethylene ball valve is easily caused, and test deviation is generated. Meanwhile, the efficiency of the equipment is low, the quantity of the equipment is small, the production progress of an enterprise is influenced, the quantity of the equipment is large, the investment cost of the enterprise is greatly increased, the test environment is dirty, and the image of the enterprise is influenced.
Disclosure of Invention
In order to solve the problems, the invention provides the leakage detection equipment for the natural gas ball valve, which has the advantages of high test efficiency, higher test precision and lower manufacturing cost.
In order to achieve the purpose, the invention adopts the following technical scheme: the leakage detection equipment of the natural gas ball valve at least comprises a base and a driving cylinder, wherein the base comprises a bottom plate, a top plate positioned above the bottom plate and a fixing plate positioned between the bottom plate and the top plate and used for fixing the bottom plate and the top plate;
a lower end cover is fixed on the upper side of the bottom plate, a ball valve positioning cylinder is vertically arranged on the upper side of the lower end cover, a lower sealing gasket is attached to the upper surface of the lower end cover positioned on the outer side of the ball valve positioning cylinder, an inflation inlet is formed in the lower end cover positioned on the inner side of the ball valve positioning cylinder, and the inflation inlet is connected with an external air source through an air pipe;
the driving air cylinder is inversely fixed on the upper side of the top plate, the cylinder body of the driving air cylinder is fixed with the top plate, the piston rod of the driving air cylinder penetrates through the top plate, the lower end of the piston rod is fixedly provided with an upper end cover, the upper end cover is positioned right above the lower end cover, and the upper end cover can move up and down between the top plate and the bottom plate through the driving of the driving air cylinder; an upper sealing gasket is attached to the lower surface of the upper end cover; the upper end cover is also provided with a first pressure gauge, and a pressure measuring interface of the first pressure gauge is communicated with the lower surface of the upper sealing gasket through the upper end cover and an internal air passage of the upper sealing gasket.
Preferably, the outer diameter of the ball valve positioning cylinder is matched with the inner diameter of the ball valve.
Preferably, the ball valve positioning device further comprises a detachable external leakage testing module, the top surface of the ball valve positioning cylinder is a supporting surface of the external leakage testing module, the external leakage testing module at least comprises a middle pipe, a lower sealing cover and an upper sealing cover, the lower sealing cover and the upper sealing cover are respectively positioned at two ends of the middle pipe, the lower sealing cover is fixed with the lower end of the middle pipe in a sealing manner, the upper sealing cover is fixed with the upper end of the middle pipe, and a piston connecting port communicated with the inner cavity of the middle pipe is formed in the upper sealing cover; a lower inflatable sealing ring is sleeved on the circumferential side wall of the lower sealing cover, and the lower inflatable sealing ring and the circumferential side wall of the lower sealing cover are fixed in a sealing manner; an upper inflatable sealing ring is sleeved on the circumferential side wall of the upper sealing cover, and the upper inflatable sealing ring and the circumferential side wall of the upper sealing cover are fixed in a sealing manner; the internal gas path between the lower inflatable sealing ring and the upper inflatable sealing ring is communicated; a pressurizing piston is arranged in the middle pipe, the pressurizing piston is in sliding sealing fit with the inner wall of the middle pipe, and the pressurizing piston can slide between the lower sealing cover and the upper sealing cover; a connecting rod is arranged on one side of the pressurizing piston facing the upper sealing cover, the connecting rod penetrates through the piston connecting port, one end of the connecting rod is fixed with the pressurizing piston, and the other end of the connecting rod is positioned on the outer side of the upper sealing cover; a lower sealing cover positioned in the inner cavity of the middle pipe is provided with a pressure maintaining upright post, the central axis of the pressure maintaining upright post is parallel to the central axis of the pressurizing piston, the side wall of the pressure maintaining upright post is provided with a sealing pressurizing port, a sealing pressurizing channel is arranged in the pressure maintaining upright post, one end of the sealing pressurizing channel is connected to the sealing pressurizing port, and the other end of the sealing pressurizing channel is communicated with an internal gas circuit of the lower inflatable sealing ring; one end of the pressurizing piston, which faces the pressure maintaining upright post, is provided with a flow breaking hole matched with the pressure maintaining upright post, the pressure maintaining upright post can extend into the flow breaking hole, and a sealing pressure port of the pressure maintaining upright post is in sliding sealing fit with the inner wall of the flow breaking hole; an air pressure balance channel is also arranged in the pressurizing piston, one end of the air pressure balance channel is communicated to the tail part of the flow breaking hole, and the other end of the air pressure balance channel is communicated to the end surface of the pressurizing piston facing to the direction of the lower sealing cover; the middle pipe is provided with a test pressurizing channel penetrating through the walls of the inner pipe and the outer pipe, the pipe wall of the middle pipe is internally provided with a slide block slideway, the slide block slideway is internally provided with a current-limiting slide block which can slide in the slide block slideway and can cut off the test pressurizing channel, a compression spring is arranged between one end of the current-limiting slide block and one end of the slide block slideway, and the current-limiting slide block is provided with a communicating hole for communicating the test pressurizing channel; one end of the slide block slide way, which is close to the compression spring, is communicated with an internal air passage in the lower inflatable seal ring or the upper inflatable seal ring, and the other end of the slide block slide way is communicated with an internal cavity in the middle pipe, which is positioned between the lower seal cover and the pressurizing piston; and a second pressure gauge and a pressure relief valve are arranged on the outer side of the lower sealing cover, and a pressure measuring interface of the second pressure gauge and a tail interface of the pressure relief valve are communicated with the inner cavity of the middle pipe through an air passage on the lower sealing cover.
Preferably, a lower accommodating groove is annularly arranged on the circumferential side wall of the lower sealing cover, and the lower inflatable sealing ring is positioned in the lower accommodating groove; the circumferential side wall of the upper sealing cover is annularly provided with an upper accommodating groove, and the upper inflatable sealing ring is positioned in the upper accommodating groove.
Preferably, the central axis of the lower seal cover and the central axis of the upper seal cover coincide with each other.
Preferably, the intermediate pipe is provided with a retaining block accommodating groove penetrating through the wall of the inner pipe and the outer pipe, a retaining block for preventing the pressurizing piston from moving backwards is arranged in the retaining block accommodating groove, the retaining block and the inner wall of the retaining block accommodating groove are in sealed sliding fit, one end of the retaining block can extend into the inner cavity of the intermediate pipe, and the retaining block accommodating groove is further internally provided with a return spring for retracting the retaining block into the retaining block accommodating groove.
Preferably, the retaining block is sleeved with a third sealing ring, the third sealing ring and the retaining block are fixed in a sealing manner, and the third sealing ring is in sliding sealing fit with the inner wall of the retaining block accommodating groove.
Preferably, the circumferential sleeve of the pressurizing piston is provided with a plurality of first sealing rings, the first sealing rings and the pressurizing piston are fixed in a sealing mode, and the first sealing rings are in sliding sealing fit with the inner wall of the middle pipe.
Preferably, the pressure maintaining upright column is sleeved with two second sealing rings, the two second sealing rings are both fixed with the pressure maintaining upright column in a sealing manner, the two second sealing rings are in sliding sealing fit with the inner wall of the flow cutoff hole when moving into the flow cutoff hole, and the sealing pressurization port is located between the two second sealing rings.
Therefore, the invention has the following beneficial effects: 1. the two ends of the natural gas ball valve are subjected to smaller axial force, and the testing precision is higher; 2. in the external leakage testing module, after the end covers on the two sides are completely inflated and sealed, the gas path is automatically switched to pressurize the inner cavity of the natural gas ball valve, and the automation degree is high; 3. the ball valve leakage detector can detect the ball valve internal leakage and the ball valve external leakage, has dual purposes, saves the enterprise cost and improves the enterprise production efficiency.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic view of the structure at the lower end cap of the present invention.
Fig. 3 is a schematic view of the structure at the upper end cap in the present invention.
FIG. 4 is a schematic structural diagram of an external leakage test module according to the present invention.
FIG. 5 is a schematic structural diagram of an external leakage testing module according to another aspect of the present invention.
Fig. 6 is a bottom view of the leak test module of the present invention.
Fig. 7 is a sectional view taken in the direction of a-a in fig. 6.
Fig. 8 is an enlarged view at a in fig. 7.
Fig. 9 is a schematic view showing a state where the communication hole communicates with the test pressurizing passage in the present invention.
Fig. 10 is a sectional view taken in the direction B-B in fig. 6.
Fig. 11 is an enlarged view at b in fig. 10.
FIG. 12 is a schematic structural diagram of the backstop block of the present invention.
FIG. 13 is a schematic view showing the extended state of the retaining block of the present invention.
Fig. 14 is a schematic view of the pressurizing piston in the present invention.
FIG. 15 is a schematic view of the structure of the present invention for detecting internal leakage of a ball valve.
FIG. 16 is a schematic view of the structure inside the ball valve when the upper end cap is just in contact with the connecting rod when the ball valve is exposed to leakage according to the present invention.
FIG. 17 is a schematic view of the structure inside the ball valve when the driving block pushes the pressurizing piston to move when the ball valve leaks.
FIG. 18 is a schematic structural view of the check block limiting the backward movement of the pressurizing piston when the ball valve is leaking.
1: a base; 101: a top plate; 102: a fixing plate; 103: a base plate; 104: a lower end cover; 105: a ball valve positioning cylinder; 106: a lower seal gasket; 107: an air tube; 108: an upper end cover; 109: an upper seal gasket; 110: a first pressure gauge; 111: an inflation inlet; 112: a support surface; 2: a driving cylinder; 3: a pressure maintaining test module; 301: a lower sealing cover; 302: a lower inflatable seal ring; 303: a lower accommodating groove; 304: an intermediate pipe; 305: an upper sealing cover; 306: an upper inflatable sealing ring; 307: an upper accommodating groove; 308: a piston connecting port; 309: a connecting rod; 4: testing the pressurizing channel; 401: a slider slide; 402: a current limiting slider; 403: a compression spring; 404: a communicating hole; 5: a retaining block accommodating groove; 501: a backstop block; 502: a return spring; 503: a third seal ring; 6: a second pressure gauge; 7: a pressure relief valve; 8: a pressurizing piston; 801: a flow breaking hole; 802: an air pressure balance channel; 803: a first seal ring; 9: a pressure maintaining upright column; 901: sealing the pressurizing port; 902: sealing the pressurizing channel; 903: a second seal ring; 10: a ball valve; 11: pressure maintaining and testing the cavity; 12: a valve core; 13: a valve stem.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments.
The leakage detection device for the natural gas ball valve, referring to fig. 1 to 18, comprises at least one base 1 and a driving cylinder 2, wherein the base 1 comprises a bottom plate 103, a top plate 101 positioned above the bottom plate 103, and a fixing plate 102 positioned between the bottom plate 103 and the top plate 101 and used for fixing the bottom plate 103 and the top plate 101; the bottom plate 103 and the top plate 101 are rectangles with equal size, the top plate 101 is located right above the bottom plate 103 and is arranged in parallel, two fixing plates 102 are respectively arranged on two sides between the bottom plate 103 and the top plate 101, the upper ends of the fixing plates 102 are fixed with the lower side of the top plate 101, and the lower ends of the fixing plates are fixed with the upper side of the bottom plate 103.
A lower end cover 104 is fixed on the upper side of the bottom plate 103, a ball valve positioning cylinder 105 is vertically arranged on the upper side of the lower end cover 104, the lower end of the ball valve positioning cylinder 105 is hermetically fixed with the lower end cover 104, and the outer diameter of the ball valve positioning cylinder 105 is matched with the inner diameter of the ball valve 10. When the ball valve 10 is vertically placed, the lower end opening can be clamped on the ball valve positioning cylinder 105. The upper surface of the lower end cover 104 positioned outside the ball valve positioning cylinder 105 is attached with a lower sealing gasket 106, the lower sealing gasket 106 is used for sealing a lower end port when the ball valve 10 is vertically placed, the lower end cover 104 positioned inside the ball valve positioning cylinder 105 is provided with an inflation inlet 111, and the inflation inlet 111 is connected with an external air source through an air pipe 107.
The driving cylinder 2 is inversely fixed on the upper side of the top plate 101, the cylinder body of the driving cylinder 2 is fixed with the top plate 101, the piston rod of the driving cylinder 2 penetrates through the top plate 101, the lower end of the piston rod is fixed with an upper end cover 108, the upper end cover 108 is positioned right above the lower end cover 104, the upper end cover 108 can move up and down between the top plate 101 and the bottom plate 103 through the driving of the driving cylinder 2, and the upper end cover 108 is always parallel to the lower end cover 104 when moving up and down; an upper sealing gasket 109 is attached to the lower surface of the upper end cover 108, and the upper sealing gasket 109 is used for sealing an upper end port when the ball valve 10 is vertically placed; the upper end cover 108 is further provided with a first pressure gauge 110, and a pressure measuring interface of the first pressure gauge 110 is communicated with the lower surface of the upper sealing gasket 109 through the upper end cover 108 and an internal air passage of the upper sealing gasket 109.
The leak detection device further comprises a detachable external leak testing module 3, the top surface of the ball valve positioning cylinder 105 is a supporting surface 112 of the external leak testing module 3, the external leak testing module 3 at least comprises a middle pipe 304, a lower sealing cover 301 and an upper sealing cover 305, the lower sealing cover 301 and the upper sealing cover 305 are two flat cylinders with the same diameter, the lower sealing cover 301 and the upper sealing cover 305 are respectively located at two ends of the middle pipe 304 and are coaxially arranged with the middle pipe 304, the outer diameter of the middle pipe 304 is smaller than that of the lower sealing cover 301, the lower sealing cover 301 and the lower end of the middle pipe 304 are fixed in a sealing mode, the upper sealing cover 305 and the upper end of the middle pipe 304 are fixed, and a piston connecting port 308 communicated with the inner cavity of the middle pipe 304 is formed in the upper.
A lower accommodating groove 303 is annularly arranged on the circumferential side wall of the lower sealing cover 301, a lower inflatable sealing ring 302 is annularly arranged in the lower accommodating groove 303, and the lower inflatable sealing ring 302 is hermetically fixed with the inner wall of the lower accommodating groove 303; an upper accommodating groove 307 is annularly arranged on the circumferential side wall of the upper sealing cover 305, an upper inflatable sealing ring 306 is annularly arranged in the upper accommodating groove 307, and the upper inflatable sealing ring 306 and the inner wall of the upper accommodating groove 307 are fixed in a sealing manner; the lower inflatable sealing ring 302 and the upper inflatable sealing ring 306 are communicated through the internal air passages of the lower sealing cover 301, the middle pipe 304 and the upper sealing cover 305, and the two inflatable sealing rings can be inflated and exhausted simultaneously.
A pressurizing piston 8 is arranged in the middle tube 304, as shown in fig. 14, two first sealing rings 803 are circumferentially sleeved on the pressurizing piston 8, the two first sealing rings 803 are respectively located at the upper end and the lower end of the side wall of the pressurizing piston 8, the two first sealing rings 803 are both fixed with the pressurizing piston 8 in a sealing manner, the first sealing rings 803 are in sliding sealing fit with the inner wall of the middle tube 304, and the pressurizing piston 8 can slide between the lower sealing cover 301 and the upper sealing cover 305. A connecting rod 309 is provided at a side of the pressurizing piston 8 facing the upper sealing cover 305, the connecting rod 309 penetrates through the piston connection port 308, one end of the connecting rod is fixed to the pressurizing piston 8, and the other end of the connecting rod is located outside the upper sealing cover 305.
A pressure maintaining upright post 9 is arranged on the lower sealing cover 301 positioned in the inner cavity of the middle pipe 304, the central axis of the pressure maintaining upright post 9 is superposed with the central axis of the pressurizing piston 8, a sealing pressurizing port 901 is formed in the side wall of one end, away from the lower sealing cover 301, of the pressure maintaining upright post 9, a sealing pressurizing channel 902 is arranged in the pressure maintaining upright post 9, one end of the sealing pressurizing channel 902 is connected to the sealing pressurizing port 901, the other end of the sealing pressurizing channel 902 is communicated with the internal air passage of the lower inflatable sealing ring 302 and also can be communicated with the internal air passage of the upper inflatable sealing ring 306, because the internal air passage of the. The one end that the pressurization piston 8 faced the pressurize stand 9 is seted up the hole 801 that cuts off flow that matches with the pressurize stand 9, the pressurize stand 9 can stretch into in the hole 801 that cuts off flow and the sealed pressurized port 901 department of pressurize stand 9 is the sliding seal cooperation with the inner wall of the hole 801 that cuts off flow, specifically sets up to be equipped with two second sealing washer 903 on the pressurize stand 9, and two second sealing washers 903 all are sealed fixed with the pressurize stand 9, and two second sealing washers 903 all are the sliding seal cooperation with the hole 801 inner wall that cuts off flow when moving to the hole 801 that cuts off flow, sealed pressurized port 901 is located between two second sealing washers 903. The opening of the flow breaking hole 801 is provided with a chamfer angle, so that the pressure maintaining upright post 9 can conveniently stretch into the flow breaking hole. An air pressure balance channel 802 is further arranged in the pressurizing piston 8, one end of the air pressure balance channel 802 is communicated to the tail part of the flow breaking hole 801, and the other end of the air pressure balance channel 802 is communicated to the end face, facing the direction of the lower sealing cover 301, of the pressurizing piston 8. After the pressure maintaining column 9 extends into the flow breaking hole 801, the air pressure in the flow breaking hole 801 increases due to the extension of the pressure maintaining column 9, so that the pressure maintaining column 9 is prevented from extending further, and the air pressure balancing channel 802 is used for discharging the increased air pressure in the flow breaking hole 801 back to the inner cavity of the middle pipe 304 between the pressurizing piston 8 and the lower sealing cover 301, so that the resistance when the pressure maintaining column 9 extends into the flow breaking hole 801 is reduced.
The middle pipe 304 is provided with a test pressurizing channel 4 penetrating through the wall of the inner pipe and the outer pipe, the pipe wall of the middle pipe 304 is internally provided with a slide block slideway 401, the slide block slideway 401 is internally provided with a current-limiting slide block 402 which can slide in the slide block slideway 401 and can cut off the test pressurizing channel 4, a compression spring 403 is arranged between one end of the current-limiting slide block 402 and one end of the slide block slideway 401, and the current-limiting slide block 402 is provided with a communicating hole 404 for communicating the test pressurizing channel 4; one end of the slide block slide way 401, close to the compression spring 403, is communicated with an internal air passage in the upper inflatable seal ring 306, and the other end of the slide block slide way 401 is communicated with an internal cavity in the middle pipe 304, which is positioned between the lower seal cover 301 and the pressurizing piston 8. When the air pressure in the inner cavity of the middle pipe 304 between the lower sealing cover 301 and the pressurizing piston 8 is less than or equal to the air pressure in the upper inflatable sealing ring 306 and is greater than the air pressure, the sliding block slide way 401 is cut off by the current-limiting sliding block 402; when the air pressure in the inner cavity of the middle tube 304 between the lower sealing cover 301 and the pressurizing piston 8 is gradually larger than the air pressure in the upper inflatable sealing ring 306, the flow-limiting slider 402 moves towards the compression spring 403 and presses the compression spring 403, and finally the test pressurizing channel 4 is communicated through the communication hole 404 on the flow-limiting slider 402.
The outer side of the lower sealing cover 301 is provided with a second pressure gauge 6 and a pressure release valve 7, a pressure measuring interface of the second pressure gauge 6 and a tail interface of the pressure release valve 7 are communicated with an inner cavity of the middle pipe 304 through an air passage on the lower sealing cover 301, and the second pressure gauge 6 is used for monitoring the air pressure value of the inner cavity of the middle pipe 304 between the lower sealing cover 301 and the pressurizing piston 8 and judging whether leakage exists in the ball valve 10. The pressure release valve 7 can be used for releasing the air pressure in the inner cavity of the middle pipe 304 between the lower sealing cover 301 and the pressurizing piston 8 so as to facilitate the resetting of the pressurizing piston 8 for the next use, and can also judge the approximate condition of air flow leakage in the ball valve 10 through the air flow sound during pressure release.
Run through interior outer tube wall on the intermediate tube 304 and be equipped with a stopping piece storage tank 5, be equipped with a stopping piece 501 that is used for preventing pressurization piston 8 backspacing in the stopping piece storage tank 5, as shown in fig. 12, stopping piece 501 front end is the button head shape, is sealed sliding fit between the inner wall of stopping piece 501 and stopping piece storage tank 5, specifically sets up to be equipped with at least one third sealing washer 503 on the stopping piece 501 cover, be sealed fixed between third sealing washer 503 and the stopping piece 501, be sliding seal cooperation between the inner wall of third sealing washer 503 and stopping piece storage tank 5. One end of the retaining block 501 may extend into the inner cavity of the intermediate pipe 304 to limit the back of the pressurizing piston 8, as shown in fig. 13, and a return spring 502 for retracting the retaining block 501 into the retaining block accommodating groove 5 is further disposed in the retaining block accommodating groove 5, as shown in fig. 11.
When the ball valve leaks: need not to use outer hourglass test module 3, close case 12 of ball valve 10, as shown in fig. 15, erect ball valve 10 that awaits measuring, the ball valve 10 lower extreme is placed on lower end cover 104, and, make the lower extreme port joint of ball valve 10 on ball valve location section of thick bamboo 105, start driving actuating cylinder 2, it moves down to drive actuating cylinder 2 drive upper end cover 108, until the upper seal pad 109 of upper end cover 108 downside contacts with the upper end port of ball valve 10, at this moment, the upper end port of ball valve 10 is sealed by upper seal pad 109, the lower extreme port of ball valve 10 is sealed by lower seal pad 106, be two upper and lower seal chamber in the ball valve 10. The inflation inlet 111 on the lower end cover 104 starts to inflate and pressurize the cavity on the lower side of the ball valve 10 through the air pipe 107 connected with an external air source, whether internal leakage exists in the ball valve 10 is judged by observing the reading of the first pressure gauge 110 on the upper end cover 108, and when the reading on the first pressure gauge 110 is continuously increased, the fact that air in the cavity on the lower side of the ball valve 10 continuously leaks into the cavity on the upper side is judged, and the fact that the ball valve 10 internally leaks is judged; when the reading on the first pressure gauge 110 is stable and does not change, which indicates that the gas in the lower cavity of the ball valve 10 does not leak into the upper cavity, it is determined that there is no internal leakage of the ball valve 10.
When the ball valve leaks outwards: the external leakage testing module 3 needs to be used, and when the external leakage testing module 3 is not tested and used, the pressurizing piston 8 is positioned in the middle pipe 304 and close to the upper sealing cover 305 side; the pressure maintaining upright column 9 does not extend into the flow breaking hole 801 of the pressurizing piston 8; the lower inflatable seal ring 302 and the upper inflatable seal ring 306 are not inflated; the pressure release valve 7 is in a closed state; the current-limiting slide block 402 is under the spring action of a compression spring 403 and is in a state of cutting off the test pressurizing channel 4; the retaining block 501 is fully retracted into the retaining block accommodating groove 5 under the action of the return spring 502.
During testing, as shown in fig. 16 and 17, the valve core 12 of the ball valve 10 is opened, the ball valve 10 to be tested is erected, the external leakage testing module 3 of the present invention is placed in the inner cavity of the ball valve 10, the connecting rod 309 is disposed upward, the ball valve 10 and the external leakage testing module 3 are vertically placed on the lower end cover 104 of the base 1, the lower end port of the ball valve 10 is clamped on the ball valve positioning cylinder 105, at this time, the lower sealing cover 301 of the external leakage testing module 3 in the ball valve 10 is supported on the supporting surface 112 on the upper side of the ball valve positioning cylinder 105, meanwhile, the middle pipe 304 of the external leakage testing module 3 penetrates through the middle hole of the valve core 12 of the ball valve 10, and the lower sealing cover 301 and the upper sealing cover 305 are respectively located. The driving cylinder 2 is started, a piston rod of the driving cylinder 2 drives the upper end cover 108 to move downwards, the lower side of the upper end cover 108 contacts with the upper end of the connecting rod 309 and pushes the pressurizing piston 8 to move towards the direction of the lower sealing cover 301, in the moving process of the pressurizing piston 8, the air pressure in the inner cavity of the middle pipe 304 between the lower sealing cover 301 and the pressurizing piston 8 is increased under the extrusion action of the pressurizing piston 8, and the air pressure flows into the lower inflatable sealing ring 302 and the upper inflatable sealing ring 306 through the sealing pressurizing opening 901 and the sealing pressurizing channel 902, so that the inflation expansion of the lower inflatable sealing ring 302 and the upper inflatable sealing ring 306 are both attached to the inner wall of the ball valve 10 to realize sealing, and at the moment, a pressure maintaining test cavity 11 is formed between the outer wall. The pressurizing piston 8 moves forward continuously, when the front end of the pressure maintaining upright post 9 extends into the flow breaking hole 801 of the pressurizing piston 8, the sealing pressurizing port 901 is sealed by the inner wall of the flow breaking hole 801, the lower inflatable sealing ring 302 and the upper inflatable sealing ring 306 are not inflated any more, and the outer wall of the lower inflatable sealing ring 302 and the inner wall of the ball valve 10 are always kept in a fit sealing state. The air pressure in the inner cavity of the middle tube 304 between the lower sealing cover 301 and the pressurizing piston 8 is continuously increased, the flow-limiting slide block 402 is gradually pushed to move towards the compressing spring 403 and extrude the compressing spring 403, and finally the communication hole 404 on the flow-limiting slide block 402 communicates with the test pressurizing channel 4, at this time, the air pressure in the inner cavity of the middle tube 304 between the lower sealing cover 301 and the pressurizing piston 8 can be conveyed into the pressure maintaining test cavity 11 through the test pressurizing channel 4, along with the increase of the air pressure in the pressure maintaining test cavity 11 and the generation of driving force on the retaining block 501, before the pressurizing piston 8 slides over the retaining block 501, the retaining block 501 is blocked by the side wall of the pressurizing piston 8 and cannot extend out of the retaining block accommodating groove 5, when the pressurizing piston 8 continuously moves forwards until the retaining block 501 completely slides over, the rear side of the retaining block 501 is acted by the air pressure in the pressure maintaining test cavity 11, the retaining block 501 compresses the return spring 502, and the front, as shown in fig. 18, at this time, the driving block 106 stops driving the pressurizing piston 8 to move forward, the piston rod of the driving cylinder 2 retracts, the pressurizing piston 8 retracts by the reaction force of the air pressure in the inner cavity of the intermediate pipe 304 between the lower seal cover 301 and the pressurizing piston 8 until contacting the backstop block 501, and the backstop block 501 restricts the withdrawal to stop the retraction. So far, this ball valve 10 aerifys the pressurize operation and accomplishes, can take off this ball valve 10 from the lower end cover 104 of base 1, let ball valve 10 and its inside outer hourglass test module 3 stand for a period of time, observe the reading of record second manometer 6 through different time points, can judge whether atmospheric pressure in the pressurize test cavity 11 has the valve rod 13 department from ball valve 10 to leak, and then judge whether this ball valve 10 has outer hourglass. After the test is finished, the pressure release valve 7 is opened, the air pressure in the middle pipe 304 is released, the air pressure in the pressure maintaining test cavity 11 can also be partially released through the test pressurizing channel 4, the stopping block 501 retracts into the stopping block accommodating groove 5 under the action of the return spring 502, and the pressurizing piston 8 is pulled back to the initial test position, so that the leakage test can be carried out on the next ball valve 10.
In the invention, one base 1 can correspond to a plurality of leakage test modules 3, a manufacturer does not need to manufacture one base 1 for each leakage test module 3, the manufacturing cost of the leakage test modules 3 is low, and the investment of enterprises is greatly reduced.
Claims (8)
1. The utility model provides a leak hunting equipment of natural gas ball valve, includes a base (1) and a drive cylinder (2) at least, its characterized in that: the base (1) comprises a bottom plate (103), a top plate (101) positioned above the bottom plate (103) and a fixing plate (102) positioned between the bottom plate (103) and the top plate (101) and used for fixing the bottom plate (103) and the top plate (101);
a lower end cover (104) is fixed on the upper side of the bottom plate (103), a ball valve positioning cylinder (105) is vertically arranged on the upper side of the lower end cover (104), a lower sealing gasket (106) is attached to the upper surface of the lower end cover (104) positioned on the outer side of the ball valve positioning cylinder (105), an inflation inlet (111) is formed in the lower end cover (104) positioned on the inner side of the ball valve positioning cylinder (105), and the inflation inlet (111) is connected with an external air source through an air pipe (107);
the driving air cylinder (2) is inversely fixed on the upper side of the top plate (101), the cylinder body of the driving air cylinder (2) is fixed with the top plate (101), the piston rod of the driving air cylinder (2) penetrates through the top plate (101) to be arranged, the lower end of the piston rod is fixedly provided with an upper end cover (108), the upper end cover (108) is positioned right above the lower end cover (104), and the upper end cover (108) can move up and down between the top plate (101) and the bottom plate (103) through the driving of the driving air cylinder (2); an upper sealing gasket (109) is attached to the lower surface of the upper end cover (108); the upper end cover (108) is also provided with a first pressure gauge (110), and a pressure measuring interface of the first pressure gauge (110) is communicated with the lower surface of the upper sealing gasket (109) through the upper end cover (108) and an internal air passage of the upper sealing gasket (109);
the ball valve positioning device is characterized by further comprising a detachable outer leakage testing module (3), the top surface of the ball valve positioning cylinder (105) is a supporting surface (112) of the outer leakage testing module (3), the outer leakage testing module (3) at least comprises a middle pipe (304), a lower sealing cover (301) and an upper sealing cover (305), the lower sealing cover (301) and the upper sealing cover (305) are respectively located at two ends of the middle pipe (304), the lower sealing cover (301) is fixed with the lower end of the middle pipe (304) in a sealing mode, the upper sealing cover (305) is fixed with the upper end of the middle pipe (304), and a piston connecting port (308) communicated with the inner cavity of the middle pipe (304) is formed in the upper sealing cover (305); a lower inflatable sealing ring (302) is sleeved on the circumferential side wall of the lower sealing cover (301), and the lower inflatable sealing ring (302) is hermetically fixed with the circumferential side wall of the lower sealing cover (301); an upper inflatable sealing ring (306) is sleeved on the circumferential side wall of the upper sealing cover (305), and the upper inflatable sealing ring (306) is fixed with the circumferential side wall of the upper sealing cover (305) in a sealing manner; the internal air passage between the lower inflatable sealing ring (302) and the upper inflatable sealing ring (306) is communicated; a pressurizing piston (8) is arranged in the middle pipe (304), the pressurizing piston (8) is in sliding sealing fit with the inner wall of the middle pipe (304), and the pressurizing piston (8) can slide between the lower sealing cover (301) and the upper sealing cover (305); one side of the pressurizing piston (8) facing the upper sealing cover (305) is provided with a connecting rod (309), the connecting rod (309) penetrates through the piston connecting port (308), one end of the connecting rod is fixed with the pressurizing piston (8), and the other end of the connecting rod is positioned on the outer side of the upper sealing cover (305); a pressure maintaining upright post (9) is arranged on a lower sealing cover (301) positioned in the inner cavity of the middle pipe (304), the central axis of the pressure maintaining upright post (9) is parallel to the central axis of the pressurizing piston (8), a sealing pressurizing port (901) is formed in the side wall of the pressure maintaining upright post (9), a sealing pressurizing channel (902) is arranged in the pressure maintaining upright post (9), one end of the sealing pressurizing channel (902) is connected to the sealing pressurizing port (901), and the other end of the sealing pressurizing channel is communicated with an internal gas path of the lower inflatable sealing ring (302); one end, facing the pressure maintaining upright post (9), of the pressurizing piston (8) is provided with a flow breaking hole (801) matched with the pressure maintaining upright post (9), the pressure maintaining upright post (9) can stretch into the flow breaking hole (801), and a sealing pressurizing opening (901) of the pressure maintaining upright post (9) is in sliding sealing fit with the inner wall of the flow breaking hole (801); an air pressure balance channel (802) is further arranged in the pressurizing piston (8), one end of the air pressure balance channel (802) is communicated to the tail part of the flow breaking hole (801), and the other end of the air pressure balance channel (802) is communicated to the end face, facing the direction of the lower sealing cover (301), of the pressurizing piston (8); the middle pipe (304) penetrates through the walls of the inner pipe and the outer pipe to be provided with a test pressurizing channel (4), the pipe wall of the middle pipe (304) is internally provided with a slide block slideway (401), the slide block slideway (401) is internally provided with a current-limiting slide block (402) which can slide in the slide block slideway (401) and can cut off the test pressurizing channel (4), a compression spring (403) is arranged between one end of the current-limiting slide block (402) and one end of the slide block slideway (401), and the current-limiting slide block (402) is provided with a communication hole (404) for communicating the test pressurizing channel (4); one end, close to a compression spring (403), of the sliding block sliding way (401) is communicated with an internal air passage in the lower inflatable sealing ring (302) or the upper inflatable sealing ring (306), and the other end of the sliding block sliding way (401) is communicated with an internal cavity in the middle pipe (304) between the lower sealing cover (301) and the pressurizing piston (8); the outer side of the lower sealing cover (301) is provided with a second pressure gauge (6) and a pressure release valve (7), and a pressure measuring interface of the second pressure gauge (6) is communicated with a tail interface of the pressure release valve (7) through an air passage in the lower sealing cover (301) and an inner cavity of the middle pipe (304).
2. Leak detection apparatus for a natural gas ball valve according to claim 1, wherein: the outer diameter of the ball valve positioning cylinder (105) is matched with the inner diameter of the natural gas ball valve (10).
3. Leak detection apparatus for a natural gas ball valve according to claim 1, wherein: a lower containing groove (303) is annularly arranged on the circumferential side wall of the lower sealing cover (301), and the lower inflatable sealing ring (302) is positioned in the lower containing groove (303); an upper containing groove (307) is annularly arranged on the circumferential side wall of the upper sealing cover (305), and the upper inflatable sealing ring (306) is positioned in the upper containing groove (307).
4. Leak detection apparatus for a natural gas ball valve according to claim 1, wherein: the central axis of the lower sealing cover (301) is coincident with the central axis of the upper sealing cover (305).
5. Leak detection apparatus for a natural gas ball valve according to claim 1, wherein: the middle pipe (304) is provided with a stopping block accommodating groove (5) by penetrating through the wall of the inner pipe and the outer pipe, a stopping block (501) for preventing the pressurizing piston (8) from moving back is arranged in the stopping block accommodating groove (5), the stopping block (501) is in sealed sliding fit with the inner wall of the stopping block accommodating groove (5), one end of the stopping block (501) can stretch out of the inner cavity of the middle pipe (304), and a return spring (502) for retracting the stopping block (501) into the stopping block accommodating groove (5) is further arranged in the stopping block accommodating groove (5).
6. Leak detection apparatus for a natural gas ball valve according to claim 5, wherein: the stopping block (501) is sleeved with a third sealing ring (503), the third sealing ring (503) and the stopping block (501) are fixed in a sealing mode, and the third sealing ring (503) is matched with the inner wall of the stopping block accommodating groove (5) in a sliding sealing mode.
7. Leak detection apparatus for a natural gas ball valve according to claim 1, wherein: the circumference cover of pressurization piston (8) is equipped with a plurality of first sealing washer (803), for sealed fixed between first sealing washer (803) and pressurization piston (8), be sliding seal cooperation between the inner wall of first sealing washer (803) and intermediate tube (304).
8. Leak detection apparatus for a natural gas ball valve according to claim 1, wherein: the pressure maintaining vertical column (9) is sleeved with two second sealing rings (903), the two second sealing rings (903) are fixed to the pressure maintaining vertical column (9) in a sealing mode, the two second sealing rings (903) are matched with the inner wall of the flow cutoff hole (801) in a sliding sealing mode when moving into the flow cutoff hole (801), and the sealing pressurization port (901) is located between the two second sealing rings (903).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810746599.1A CN108507733B (en) | 2018-07-09 | 2018-07-09 | Leakage detection equipment of natural gas ball valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810746599.1A CN108507733B (en) | 2018-07-09 | 2018-07-09 | Leakage detection equipment of natural gas ball valve |
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| CN108507733B true CN108507733B (en) | 2021-01-29 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109374235B (en) * | 2018-11-29 | 2020-05-15 | 贵港新奥燃气工程有限公司 | Natural gas pipe fitting test equipment |
| CN109682554A (en) * | 2019-01-14 | 2019-04-26 | 中国计量大学 | A kind of PE ball-valve valve rod tightness test device and its detection method |
| CN110220067B (en) * | 2019-06-10 | 2020-11-20 | 义乌市安航科技有限公司 | Sealing pressure-maintaining sealing cover of gas pipe network |
| CN113210282B (en) * | 2021-01-29 | 2022-10-11 | 广西人防设计研究院有限公司 | Civil air defense door sealing performance detection system |
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|---|---|---|---|---|
| CN107152993A (en) * | 2017-05-04 | 2017-09-12 | 浙江庆发管业科技有限公司 | A kind of polyethylene ball valve air-tightness detection device |
| CN206945240U (en) * | 2017-05-04 | 2018-01-30 | 浙江庆发管业科技有限公司 | A kind of polyethylene ball valve air-tightness detection device |
| CN107727331A (en) * | 2017-11-08 | 2018-02-23 | 宁波市宇华电器有限公司 | A kind of ball-valve valve rod air leakage test equipment |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107152993A (en) * | 2017-05-04 | 2017-09-12 | 浙江庆发管业科技有限公司 | A kind of polyethylene ball valve air-tightness detection device |
| CN206945240U (en) * | 2017-05-04 | 2018-01-30 | 浙江庆发管业科技有限公司 | A kind of polyethylene ball valve air-tightness detection device |
| CN107727331A (en) * | 2017-11-08 | 2018-02-23 | 宁波市宇华电器有限公司 | A kind of ball-valve valve rod air leakage test equipment |
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Effective date of registration: 20201217 Address after: No.2, baishigong palace, wanggongtan, Bayi street, Anyuan District, Pingxiang City, Jiangxi Province Applicant after: Pingxiang Gas Co.,Ltd. Address before: 311835 Room 501, unit 2, building 9, Zhongjin celebrity community, Diankou Town, Zhuji City, Shaoxing City, Zhejiang Province Applicant before: Chen Yongjie |
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