CN108871707B - Leakage detection device of natural gas ball valve - Google Patents
Leakage detection device of natural gas ball valve Download PDFInfo
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- CN108871707B CN108871707B CN201810960947.5A CN201810960947A CN108871707B CN 108871707 B CN108871707 B CN 108871707B CN 201810960947 A CN201810960947 A CN 201810960947A CN 108871707 B CN108871707 B CN 108871707B
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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 a leakage detection device of a natural gas ball valve, which relates to the technical field of natural gas ball valve detection and at least comprises a bottom plate, wherein a left positioning seat and a right positioning seat are arranged on the bottom plate, the left positioning seat and the right positioning seat are oppositely arranged on the left and right sides, a left positioning bayonet used for positioning a left connecting pipe of the ball valve is arranged on the left positioning seat, and a right positioning bayonet used for positioning a right connecting pipe of the ball valve is arranged on the right positioning seat. The invention provides a leakage detecting device with two ends of a natural gas ball valve free from axial force and high in testing precision, and aims to solve the problem that when the existing natural gas ball valve leakage detecting device is used for testing, pressure is applied to two ends of the ball valve, so that the deformation of the ball valve is caused to influence a testing result.
Description
Technical Field
The invention relates to the technical field of natural gas ball valve detection, in particular to a leakage detection device of a natural gas ball valve.
Background
In the existing natural gas pipe network, a metal ball valve is gradually replaced by a polyethylene ball valve, and the polyethylene ball valve has the advantages of light weight, corrosion resistance, long service life and the like, and is convenient to construct and maintain.
The natural gas ball valve is as the on-off switch in the natural gas pipe network, and is higher to the gas tightness requirement, if in the use, the natural gas leakage appears, will cause the harm of being difficult to measure, consequently, the natural gas ball valve all need pass through leak hunting test before dispatching from the factory.
The existing natural gas ball valve leakage detection equipment usually adopts force application devices such as an air cylinder and a jack to clamp two ends of a ball valve, and then air pressure is filled into an inner cavity of the ball valve to test, but the polyethylene ball valve is made of plastic, and the ball valve is easy to deform due to axial stress, so that a test result is influenced.
Disclosure of Invention
The invention provides a leakage detecting device with two ends of a natural gas ball valve free from axial force and high in testing precision, and aims to solve the problem that when the existing natural gas ball valve leakage detecting device is used for testing, pressure is applied to two ends of the ball valve, so that the deformation of the ball valve is caused to influence a testing result.
In order to achieve the purpose, the invention adopts the following technical scheme: a leakage detection device of a natural gas ball valve at least comprises a bottom plate, wherein a left positioning seat and a right positioning seat are arranged on the bottom plate, the left positioning seat and the right positioning seat are oppositely arranged on the left side and the right side, a left positioning bayonet for positioning a left connecting pipe of the ball valve is arranged on the left positioning seat, and a right positioning bayonet for positioning a right connecting pipe of the ball valve is arranged on the right positioning seat;
the upper side of bottom plate is equipped with a loading system who is used for the pressurization in the left chamber of ball valve to and a pressure measurement mechanism who is used for testing ball valve right side chamber atmospheric pressure, loading system is located the left side of left side positioning seat, pressure measurement mechanism is located the right side of right side positioning seat.
Preferably, the pressurizing mechanism comprises a first motor, a driving plate, a pressure storage cylinder and a left sealing structure, the first motor is transversely fixed on the bottom plate, the central axis of the first motor is parallel to the central axis of the ball valve when the ball valve is positioned on the left positioning seat and the right positioning seat, the top end of a motor shaft of the first motor is coaxially connected with the motor shaft through a first lead screw, a first lead screw nut matched with the first lead screw is screwed on the first lead screw, and the driving plate is fixed with the first lead screw nut and can move left and right along with the first lead screw nut;
the pressure storage cylinder comprises a tubular cylinder body with openings at two ends, a driving piston and a driven piston, the cylinder body is transversely fixed on the bottom plate, the central axis of the cylinder body is parallel to the central axis of the first screw rod, the driving piston and the driven piston are both arranged in an inner cavity of the cylinder body and are in sliding sealing fit with the inner wall of the cylinder body, the driven piston is positioned on the right side of the driving piston, the left side surface of the driving piston is connected with the driving plate through a pressure storage piston rod, a first spring is arranged between the right side surface of the driven piston and the right top surface of the inner cavity of the cylinder body, and the driven piston is provided with a pressure storage air outlet penetrating through the;
the left sealing structure sequentially comprises a left connecting plate, a pushing plate and a left sealing cover from left to right, the left connecting plate is fixed with the driving plate, the left connecting plate is fixedly connected with the pushing plate through a plurality of left connecting rods, and the pushing plate is elastically connected with the left sealing cover through a plurality of second springs;
the left sealing cover is in a transverse cylindrical shape, a left socket for a left ball valve connecting pipe to extend into is arranged at the right end of the left sealing cover along the axis of the left sealing cover, a pressurizing and inflating hole is formed in the bottom surface of the left socket and penetrates through the left end surface of the left sealing cover, a left sealing ring and a left pressing ring are arranged at the opening of the left socket, the left pressing ring can translate along the central axis of the left socket in the left socket, a first left annular inclined surface which is in an expanding shape along the central axis of the left sealing cover is arranged in the left socket, a second left annular inclined surface which is in an expanding shape along the central axis of the left pressing ring is arranged at the left end of the left pressing ring, an annular left sealing ring positioning groove for positioning the left sealing ring is formed between the first left annular inclined surface and the second left annular inclined surface, the left sealing ring is positioned in the left sealing ring positioning;
an air passage communicating vessel is arranged on the lower side of the pushing plate and comprises a communicating vessel outer cylinder, a communicating vessel piston and a communicating vessel piston rod, the outer wall of the communicating vessel outer cylinder is fixed with the pushing plate, the central axis of the communicating vessel outer cylinder is parallel to the central axis of the left sealing cover, openings are formed in two ends of the communicating vessel outer cylinder, the communicating vessel piston is arranged in the communicating vessel outer cylinder and is in sliding sealing fit with the inner wall of the communicating vessel outer cylinder, one end of the communicating vessel piston rod is fixed with the right side face of the communicating vessel piston, the other end of the communicating vessel piston rod penetrates through the right opening of the communicating vessel outer cylinder and extends to the outer side of the communicating vessel outer cylinder, and the communicating vessel piston rod is in sliding sealing fit with; a piston return spring is arranged between the left side surface of the communicating vessel piston and the left end surface of the inner hole of the communicating vessel outer cylinder; the communicating vessel outer cylinder is provided with a communicating vessel air inlet and a communicating vessel air outlet through the inner wall and the outer wall, the communicating vessel air outlet is positioned on the left side of the communicating vessel piston and is communicated with the pressurization and inflation hole of the left sealing cover through an air pipe, the communicating vessel air inlet is positioned on the right side of the communicating vessel piston and is communicated with the pressure storage air outlet of the driven piston through the air pipe; the connector piston is slidable to the left side of the connector outlet hole.
Preferably, the pressure measuring mechanism comprises a second motor, a pressure gauge and a right sealing structure, the second motor is transversely fixed on the bottom plate, the central axis of the second motor is parallel to the central axis of the first motor, the top end of a motor shaft of the second motor is coaxially connected with the motor shaft through a second screw rod, and a second screw rod nut matched with the second screw rod is screwed on the second screw rod;
the right sealing structure sequentially comprises a right sealing cover and a right connecting plate from left to right, the right sealing cover and the right connecting plate are fixedly connected through a plurality of right connecting rods, and the right connecting plate is fixedly connected with the second screw nut and can move left and right along with the second screw nut;
the right sealing cover is transversely cylindrical, a right socket for a right ball valve connecting pipe to extend into is arranged at the left end of the right sealing cover along the axis of the right sealing cover, a pressure measuring air hole is formed in the bottom surface of the right socket and penetrates through the right end face of the right sealing cover, a right sealing ring and a right pressing ring are arranged at the opening of the right socket, the right pressing ring can translate in the right socket along the central axis of the right socket, a first right annular inclined plane which is in an expanding shape along the central axis of the right sealing cover is arranged in the right socket, a second right annular inclined plane which is in an expanding shape along the central axis of the right pressing ring is arranged at the right end of the right pressing ring, an annular right sealing ring positioning groove for positioning the right sealing ring is formed between the first right annular inclined plane and the second right annular inclined plane, the right sealing ring is positioned in the right sealing ring positioning groove; the pressure gauge is fixed on the bottom plate through a support, and a pressure measuring interface of the pressure gauge is connected with a pressure measuring air hole of the right sealing cover through an air pipe.
Preferably, the left positioning bayonet and the right positioning bayonet are both U-shaped bayonets which are opened upwards.
Preferably, two left polish rods are transversely fixed on the left side face of the left positioning seat, the central axes of the two left polish rods are parallel to the central axis of the first lead screw, the left side and the right side of the pushing plate are respectively provided with a pushing plate guide hole, the two pushing plate guide holes are in one-to-one correspondence with the two left polish rods and are in sliding fit, the left side and the right side of the left sealing cover are respectively provided with a left sealing cover guide hole, and the two left sealing cover guide holes are in one-to-one correspondence with the two left polish rods and are in sliding fit.
Preferably, two right polish rods are transversely fixed on the right side surface of the right positioning seat, the central axes of the two right polish rods are parallel to the central axis of the second screw rod, a right sealing cover guide hole is respectively arranged on each of the left side and the right side of the right sealing cover, and the two right sealing cover guide holes are in one-to-one correspondence with the two right polish rods and are in sliding fit with the two right polish rods.
Therefore, the invention has the following beneficial effects: 1. during testing, the natural gas ball valve is axially unstressed, and the testing precision is high; 2. the high-pressure air source can be automatically generated without an additional test inflation air source, and the automation degree is high; 3. the manufacturing cost is low, and the testing efficiency is high.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural view of another aspect of the present invention.
Fig. 3 is a top view of the present invention.
Fig. 4 is an enlarged view at a in fig. 3.
Fig. 5 is an enlarged view at b in fig. 3.
Fig. 6 is a sectional view of the pressure storage cylinder in the present invention.
Fig. 7 is a sectional view of the left seal structure of the present invention.
Fig. 8 is a sectional view of the right seal structure of the present invention.
FIG. 9 is a schematic diagram of the test state of the present invention.
Fig. 10 is a top view of the test condition of the present invention.
FIG. 11 is a front view of the test state of the present invention.
Figure 12 is a schematic view of the structure within the left seal configuration under test of the present invention.
1: a base plate; 2: a left positioning seat; 201: a left positioning bayonet; 3: a right positioning seat; 301: a right positioning bayonet; 4: a pressurizing mechanism; 401: a first motor; 402: a drive plate; 403: a first lead screw; 5: a pressure measuring mechanism; 501: a second motor; 502: a pressure gauge; 503: a second lead screw; 503: a second feed screw nut; 6: a left sealing structure; 601: a left connecting plate; 602: a push plate; 603: a left sealing cover; 604: a left connecting rod; 605: a second spring; 606: a left compression ring; 607: a left jack; 608: a left sealing ring; 609: a first left annular chamfer; 610: a second left annular chamfer; 611: a left seal ring locating groove; 612: a gas path communicating vessel; 613: a communicator outer cylinder; 614: a connector piston; 615: a piston return spring; 616: a communicating vessel piston rod; 617: an air outlet of the communicating vessel; 618: a communicating vessel air inlet; 619: a pressurized inflation hole; 7: a right sealing structure; 701: a right sealing cover; 702: a right connecting plate; 703: a right connecting rod; 704: a right pressure ring; 705: a right socket; 706: a right seal ring; 707: a second right annular chamfer; 708: a first right annular chamfer; 709: a right seal ring locating groove; 710: measuring the pressure of the air hole; 8: a pressure storage cylinder; 801: a tubular cylinder; 802: an active piston; 803: a slave piston; 804: a pressure storage piston rod; 805: a first spring; 806: a pressure storage vent hole; 9: a ball valve.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments.
A leakage detection device for a natural gas ball valve, referring to fig. 1 to 12, at least comprising a bottom plate 1, wherein the bottom plate 1 is provided with a left positioning seat 2 and a right positioning seat 3, the left positioning seat 2 and the right positioning seat 3 are oppositely arranged left and right, the left positioning seat 2 is provided with a left positioning bayonet 201 for positioning a left connecting pipe of a ball valve 9, and the right positioning seat 3 is provided with a right positioning bayonet 301 for positioning a right connecting pipe of the ball valve 9; the left positioning bayonet 201 and the right positioning bayonet 301 are both U-shaped bayonets with upward openings, the size of the left positioning bayonet 201 is matched with the outer diameter of a left connecting pipe of the ball valve 9, and the size of the right positioning bayonet 301 is matched with the outer diameter of a left connecting pipe of the ball valve 9.
A pressurizing mechanism 4 for pressurizing a left cavity of the ball valve 9 and a pressure measuring mechanism 5 for testing the air pressure of a right cavity of the ball valve 9 are arranged on the upper side of the bottom plate 1, the pressurizing mechanism 4 is positioned on the left side of the left positioning seat 2, and the pressure measuring mechanism 5 is positioned on the right side of the right positioning seat 3; when the ball valve 9 is positioned on the left and right positioning seats, the pressurizing mechanism 4 is used for sealing the left port of the ball valve 9 and pressurizing the left cavity of the ball valve 9, and the pressure measuring mechanism 5 is used for sealing the right port of the ball valve 9 and monitoring the air pressure change in the right cavity of the ball valve 9 so as to judge whether the ball valve 9 leaks.
The pressurizing mechanism 4 comprises a first motor 401, a driving plate 402, a pressure storage cylinder 8 and a left sealing structure 6, the first motor 401 is transversely fixed on the bottom plate 1, the central axis of the first motor 401 is parallel to the central axis of the ball valve 9 when the ball valve 9 is positioned on the left and right positioning seats, the top end of the motor shaft of the first motor 401 is coaxially connected with a first screw rod 403, a first screw nut matched with the first screw rod 403 is screwed on the first screw rod 403, and the driving plate 402 is fixed with the first screw nut and can move left and right along with the first screw nut.
The pressure storage cylinder 8 comprises a tubular cylinder body 801 with two through holes at two ends, a driving piston 802 and a driven piston 803, as shown in fig. 6, the cylinder body 801 is transversely fixed on the bottom plate 1, the central axis of the cylinder body 801 is parallel to the central axis of the first screw rod 403, the driving piston 802 and the driven piston 803 are both arranged in the inner cavity of the cylinder body 801 and are in sliding sealing fit with the inner wall of the cylinder body 801, the driven piston 803 is positioned at the right side of the driving piston 802, the left side surface of the driving piston 802 is connected with the driving plate 402 through a pressure storage piston rod 804, the driving piston 802 can move left and right along with the driving plate 402, a first spring 805 is arranged between the right side surface of the driven piston 803 and the right top surface of the inner cavity of the cylinder body 801, and a pressure storage air outlet.
The left sealing structure 6 sequentially comprises a left connecting plate 601, a pushing plate 602 and a left sealing cover 603 from left to right, as shown in fig. 7, the left connecting plate 601 is fixed with the driving plate 402, the left connecting plate 601 is fixedly connected with the pushing plate 602 through two left connecting rods 604, and the pushing plate 602 is elastically connected with the left sealing cover 603 through two second springs 605.
The left sealing cover 603 is in a horizontal cylinder shape, the right end of the left sealing cover 603 is provided with a left socket 607 used for a left connecting pipe of the ball valve 9 to extend into along the axis, the caliber of the left socket 607 is matched with the outer diameter of the left connecting pipe of the ball valve 9, the bottom surface of the left socket 607 penetrates through to the left end surface of the left sealing cover 603 to be provided with a pressurizing inflation hole 619, the opening of the left socket 607 is provided with a left sealing ring 608 and a left pressing ring 606, the left pressing ring 606 can be translated along the central axis of the left socket 607 in the left socket 607, a first left annular inclined plane 609 which is in an expanded shape along the central axis of the left sealing cover 603 is arranged in the left socket 607, the left end of the left pressing ring 606 is provided with a second left annular inclined plane 610 which is in an expanded shape along the central axis of the left pressing ring 606, a left annular inclined plane 609 and a left annular inclined plane 610 which are used for positioning the left, the left sealing ring 608 is located in the left sealing ring positioning groove 611, and the right end of the left pressing ring 606 extends out of the right end face of the left sealing cover 603.
An air passage communicating vessel 612 is arranged on the lower side of the pushing plate 602, the air passage communicating vessel 612 comprises a communicating vessel outer cylinder 613, a communicating vessel piston 614 and a communicating vessel piston rod 616, the outer wall of the communicating vessel outer cylinder 613 is fixed with the pushing plate 602, the central axis of the communicating vessel outer cylinder 613 is parallel to the central axis of the left sealing cover 603, two ends of the communicating vessel outer cylinder 613 are communicated, the communicating vessel piston 614 is arranged in the communicating vessel outer cylinder 613 and is in sliding sealing fit with the inner wall of the communicating vessel outer cylinder 613, one end of the communicating vessel piston rod 616 is fixed with the right side surface of the communicating vessel piston 614, the other end of the communicating vessel piston rod 616 passes through the right communicating vessel of the communicating vessel outer cylinder 613 to extend to the outer side of the communicating vessel outer cylinder 613, and the communicating vessel piston rod 616 is; a piston return spring 615 is arranged between the left side surface of the communicating vessel piston 614 and the left end surface of the inner hole of the communicating vessel outer cylinder 613; a communicating vessel air inlet hole 618 and a communicating vessel air outlet hole 617 are arranged on the outer cylinder 613 of the communicating vessel in a penetrating mode through the inner wall and the outer wall, the communicating vessel air outlet hole 617 is located on the left side of the communicating vessel piston 614, the communicating vessel air outlet hole 617 is communicated with the pressurizing air charging hole 619 of the left sealing cover 603 through an air pipe, the communicating vessel air inlet hole 618 is located on the right side of the communicating vessel piston 614, the communicating vessel air inlet hole 618 is communicated with the pressure storage air outlet hole 806 of the driven piston 803 through the air pipe, and in a non-test state, the communicating vessel air outlet hole 617 and the communicating vessel air inlet hole 618 are isolated and not; when the connector piston rod 616 is subjected to a leftward driving force, the connector piston 614 is slidable to the left of the connector outlet hole 617 such that the connector outlet hole 617 and the connector inlet hole 618 are both located on the same side of the connector piston 614 and communicate.
The pressure measuring mechanism 5 comprises a second motor 501, a pressure gauge 502 and a right sealing structure 7, the second motor 501 is transversely fixed on the bottom plate 1, the central axis of the second motor 501 is parallel to the central axis of the first motor 401, the top end of the motor shaft of the second motor 501 and the motor shaft are coaxially connected with a second screw rod 503, and a second screw rod nut 504 matched with the second screw rod 503 is screwed on the second screw rod 503; the right sealing structure 7 sequentially comprises a right sealing cover 701 and a right connecting plate 702 from left to right, the right sealing cover 701 is fixedly connected with the right connecting plate 702 through a plurality of right connecting rods 703, and the right connecting plate 702 is fixedly connected with the second lead screw nut 504 and can move left and right along with the second lead screw nut 504, as shown in fig. 5.
The right sealing cover 701 is in a transverse cylindrical shape, a right socket 705 for allowing a right connecting pipe of the ball valve 9 to extend into is arranged at the left end of the right sealing cover 701 along the axis of the right sealing cover, the caliber size of the right socket 705 is matched with the outer diameter size of the right connecting pipe of the ball valve 9, a pressure measuring air hole 710 is formed in the position, penetrating through the bottom surface of the right socket 705, of the right sealing cover 701 to the right end face of the right sealing cover 701, a right sealing ring 706 and a right pressing ring 704 are arranged at the opening of the right socket 705, the right pressing ring 704 can translate along the central axis of the right socket 705 in the right socket 705, a first right annular inclined surface 708 which is in an expanded shape along the central axis of the right sealing cover 701 is arranged in the right socket 705, a second right annular inclined surface 707 which is in an expanded shape along the central axis of the right pressing ring 704 is arranged at the right end of the right pressing ring 704, and an, the right sealing ring 706 is positioned in the right sealing ring positioning groove 709, and the left end of the right pressing ring 704 extends out of the left end face of the right sealing cover 701; the pressure gauge 502 is fixed on the bottom plate 1 through a bracket, and a pressure measuring port of the pressure gauge 502 is connected with a pressure measuring air hole 710 of the right sealing cover 701 through an air pipe.
Two left polish rods 202 are transversely fixed on the left side surface of the left positioning seat 2, the central axes of the two left polish rods 202 are parallel to the central axis of the first lead screw 403, the left side and the right side of the pushing plate 602 are respectively provided with a pushing plate guide hole, the two pushing plate guide holes are in one-to-one correspondence and sliding fit with the two left polish rods 202, the left side and the right side of the left sealing cover 603 are respectively provided with a left sealing cover guide hole, the two left sealing cover guide holes are in one-to-one correspondence and sliding fit with the two left polish rods 202, and the pushing plate 602 and the left sealing cover 603 play a role in guiding through the two left polish rods 202. Two right polish rods 302 are transversely fixed on the right side surface of the right positioning seat 3, the central axes of the two right polish rods 302 are parallel to the central axis of the second lead screw 503, right sealing cover guide holes are respectively arranged on the left side and the right side of the right sealing cover 701, the two right sealing cover guide holes correspond to the two right polish rods 302 one by one and are in sliding fit, and the right sealing cover 701 plays a role in guiding through the two right polish rods 302.
During testing, the valve core of the ball valve 9 to be tested is rotated to a closed state, the ball valve 9 is clamped on the left positioning seat and the right positioning seat, the valve seat of the ball valve 9 is positioned between the left positioning seat and the right positioning seat, the left connecting pipe of the ball valve 9 is clamped on the left positioning bayonet 201 of the left positioning seat 2, and the right connecting pipe of the ball valve 9 is clamped on the right positioning bayonet 301 of the right positioning seat 3.
The second motor 501 is started, the second motor 501 drives the second lead screw 503 to rotate, and further drives the second lead screw nut 504 to move towards the right positioning seat 3, the right sealing cover 701 and the right connecting plate 702 both move along with the second lead screw nut 504, during the movement of the right sealing cover 701, the right connecting pipe of the ball valve 9 can extend into the right socket 705 on the left side of the right sealing cover 701, the right sealing cover 701 continues to move, the left side surface of the right pressing ring 704 can abut against the right side surface of the right positioning seat 3, at this time, the right pressing ring 704 stops moving, the right sealing cover 701 continues to move, the distance between the first right annular inclined surface 708 and the second right annular inclined surface 707 gradually decreases, the right sealing ring 706 in the right sealing ring positioning groove 709 is pressed by the first right annular inclined surface 708 and the second right annular inclined surface 707 to contract inwards, the outer wall of the right connecting pipe of the ball valve 9 is tightly held and sealed with the, at this time, the right cavity of the ball valve 9 is communicated with the pressure gauge 502, and the pressure gauge 502 monitors the air pressure change in the right cavity of the ball valve 9.
And then, the first motor 401 is started, the first motor 401 drives the first lead screw 403 to rotate, so that the first lead screw nut is driven to move towards the left positioning seat 2, the driving plate 402 moves along with the first lead screw nut, and the driving plate 402 drives the pressure storage piston rod 804 and the left connecting plate 601 to move at the same time.
When the pressure storage piston rod 804 moves, the driving piston 802 is driven to move towards the driven piston 803, so that a cavity between the driving piston 802 and the driven piston 803 is extruded, and because the other end of the pressure storage vent 806 is connected with a sealed cavity, after the cavity between the driving piston 802 and the driven piston 803 is extruded to a certain degree, pressure generated by internal gas can push the driven piston 803 to move right along with the driving piston 802 and compress the first spring 805.
Meanwhile, when the left connecting plate 601 moves, the pushing plate 602 and the left sealing cover 603 can be driven to move, in the moving process of the left sealing cover 603, a left connecting pipe of the ball valve 9 can extend into a left insertion opening 607 on the right side of the left sealing cover 603, the left sealing cover 603 continues to move, the right side surface of the left pressing ring 606 can be abutted against the left side surface of the left positioning seat 2, at the moment, the left pressing ring 606 stops moving, the left sealing cover 603 continues to move, the distance between the first left annular inclined surface 609 and the second left annular inclined surface 610 is gradually reduced, the left sealing ring 608 in the left sealing ring positioning groove 611 is squeezed by the first left annular inclined surface 609 and the second left annular inclined surface 610 to shrink inwards, the outer wall of the left connecting pipe of the ball valve 9 is tightly held, sealing is achieved between the outer wall. The pushing plate 602 continues to move to compress the second spring 605, the air channel connector 612 also continues to move along with the pushing plate 602, in the process of continuing to move, the right end of the connector piston rod 616 also abuts against the left side surface of the left positioning seat 2, the connector piston rod 616 and the connector piston 614 are blocked and stop moving forwards, the connector outer cylinder 613 continues to move along with the pushing plate 602, at this time, the piston return spring 615 starts to be compressed, and when the connector piston 614 moves to the left side of the connector air outlet 617 relative to the connector outer cylinder 613, the connector air outlet 617 and the connector air inlet 618 are both located at the right side of the connector piston 614 and are communicated. At this time, the first motor 401 stops working, meanwhile, compressed gas between the driving piston 802 and the driven piston 803 in the pressure storage cylinder 8 can sequentially pass through the pressure storage air outlet 806, the communicating device air inlet 618, the communicating device air outlet 617 and the pressurization air inlet 619, and finally enters the left cavity of the ball valve 9 to increase air pressure in the left cavity of the ball valve 9 as test air pressure, furthermore, air pressure between the driving piston 802 and the driven piston 803 in the pressure storage cylinder 8 is reduced, the compressed first spring 805 can release elastic potential energy to push the driven piston 803 to approach the driving piston 802, so that air pressure between the driving piston 802 and the driven piston 803 is supplemented, and further, larger air pressure can be input into the left cavity of the ball valve 9. After the air pressure in the left cavity of the ball valve 9 is stable, an operator only needs to observe the change of the air pressure value of the pressure gauge 502, and then whether the ball valve 9 leaks can be judged. When the air pressure value of the pressure gauge 502 is continuously increased, it is indicated that gas in the left cavity of the ball valve 9 flows to the right cavity of the ball valve 9 through the valve core of the ball valve 9, that is, the ball valve 9 has leakage; when the pressure value of the pressure gauge 502 is kept unchanged, it indicates that no gas flows from the left chamber of the ball valve 9 to the right chamber of the ball valve 9, i.e. the ball valve 9 is qualified.
Claims (4)
1. The utility model provides a leak hunting device of natural gas ball valve, includes a bottom plate (1) at least, its characterized in that: a left positioning seat (2) and a right positioning seat (3) are arranged on the bottom plate (1), the left positioning seat (2) and the right positioning seat (3) are oppositely arranged left and right, a left positioning bayonet (201) used for positioning a left connecting pipe of the ball valve (9) is arranged on the left positioning seat (2), and a right positioning bayonet (301) used for positioning a right connecting pipe of the ball valve (9) is arranged on the right positioning seat (3);
the upper side of the bottom plate (1) is provided with a pressurizing mechanism (4) for pressurizing a left cavity of the ball valve (9) and a pressure measuring mechanism (5) for testing the air pressure of a right cavity of the ball valve (9), the pressurizing mechanism (4) is positioned on the left side of the left positioning seat (2), and the pressure measuring mechanism (5) is positioned on the right side of the right positioning seat (3);
the pressurizing mechanism (4) comprises a first motor (401), a driving plate (402), a pressure storage cylinder (8) and a left sealing structure (6), the first motor (401) is transversely fixed on the bottom plate (1), the central axis of the first motor (401) is parallel to the central axis of the ball valve (9) when the ball valve (9) is positioned on the left positioning seat and the right positioning seat, the top end of a motor shaft of the first motor (401) is coaxially connected with a first screw rod (403) with the motor shaft, a first screw rod nut matched with the first screw rod (403) is screwed on the first screw rod (403), and the driving plate (402) is fixed with the first screw rod nut and can move left and right along with the first screw rod nut;
the pressure storage cylinder (8) comprises a tubular cylinder body (801) with through holes at two ends, a driving piston (802) and a driven piston (803), the cylinder body (801) is transversely fixed on the bottom plate (1), the central axis of the cylinder body (801) is parallel to the central axis of the first screw rod (403), the driving piston (802) and the driven piston (803) are both arranged in the inner cavity of the cylinder body (801) and are in sliding sealing fit with the inner wall of the cylinder body (801), the driven piston (803) is positioned on the right side of the driving piston (802), the left side surface of the driving piston (802) is connected with the driving plate (402) through a pressure storage piston rod (804), a first spring (805) is arranged between the right side surface of the driven piston (803) and the right top surface of the inner cavity of the cylinder body (801), and a pressure storage air outlet hole (806) penetrating through the left and right end surfaces of the driven piston (;
the left sealing structure (6) sequentially comprises a left connecting plate (601), a pushing plate (602) and a left sealing cover (603) from left to right, the left connecting plate (601) is fixed with the driving plate (402), the left connecting plate (601) is fixedly connected with the pushing plate (602) through a plurality of left connecting rods (604), and the pushing plate (602) is elastically connected with the left sealing cover (603) through a plurality of second springs (605);
the left sealing cover (603) is in a transverse cylindrical shape, the right end of the left sealing cover (603) is provided with a left socket (607) along the axis of the left sealing cover (603) and used for a left connecting pipe of a ball valve (9) to extend into, the bottom surface of the left socket (607) penetrates through the left end surface of the left sealing cover (603) and is provided with a pressurizing inflation hole (619), the opening of the left socket (607) is provided with a left sealing ring (608) and a left pressing ring (606), the left pressing ring (606) can be translated along the central axis of the left socket (607) in the left socket (607), a first left annular inclined plane (609) which is in an expanded shape along the central axis of the left sealing cover (603) is arranged in the left socket (607), the left end of the left pressing ring (606) is provided with a second left annular inclined plane (610) which is in an expanded shape along the central axis of the left pressing ring (606), and a left annular positioning groove (611) for positioning the left sealing ring (608) and which is annular is formed between the, the left sealing ring (608) is positioned in the left sealing ring positioning groove (611), and the right end of the left pressing ring (606) extends out of the right end face of the left sealing cover (603);
an air channel communicating vessel (612) is arranged on the lower side of the pushing plate (602), the air channel communicating vessel (612) comprises a communicating vessel outer cylinder (613), a communicating vessel piston (614) and a communicating vessel piston rod (616), the outer wall of the outer cylinder (613) of the communicating device is fixed with the push plate (602), the central axis of the outer cylinder (613) of the communicating device is parallel to the central axis of the left sealing cover (603), the two ends of the outer cylinder (613) of the communicating device are communicated, the communicating vessel piston (614) is arranged in the communicating vessel outer cylinder (613) and is in sliding sealing fit with the inner wall of the communicating vessel outer cylinder (613), one end of the communicating vessel piston rod (616) is fixed with the right side surface of the communicating vessel piston (614), the other end passes through the right port of the communicating vessel outer cylinder (613) and extends to the outer side of the communicating vessel outer cylinder (613), the communicating device piston rod (616) is in sliding sealing fit with the right port of the communicating device outer cylinder (613); a piston return spring (615) is arranged between the left side surface of the communicating vessel piston (614) and the left end surface of the inner hole of the communicating vessel outer cylinder (613); a communicating vessel air inlet hole (618) and a communicating vessel air outlet hole (617) are formed in the outer barrel (613) of the communicating vessel in a penetrating mode and penetrate through the inner wall and the outer wall, the communicating vessel air outlet hole (617) is located on the left side of the communicating vessel piston (614) and is communicated with a pressurizing and inflating hole (619) of the left sealing cover (603) through an air pipe, the communicating vessel air inlet hole (618) is located on the right side of the communicating vessel piston (614) and is communicated with a pressure storage air outlet hole (806) of the driven piston (803) through the air pipe; the connector piston (614) is slidable to the left of the connector outlet bore (617);
the pressure measuring mechanism (5) comprises a second motor (501), a pressure gauge (502) and a right sealing structure (7), the second motor (501) is transversely fixed on the bottom plate (1), the central axis of the second motor (501) is parallel to the central axis of the first motor (401), the top end of a motor shaft of the second motor (501) is coaxially connected with the motor shaft through a second screw rod (503), and a second screw rod nut (504) matched with the second screw rod (503) is screwed on the second screw rod (503);
the right sealing structure (7) sequentially comprises a right sealing cover (701) and a right connecting plate (702) from left to right, the right sealing cover (701) and the right connecting plate (702) are fixedly connected through a plurality of right connecting rods (703), and the right connecting plate (702) is fixedly connected with the second lead screw nut (504) and can move left and right along with the second lead screw nut (504);
the right sealing cover (701) is in a transverse cylindrical shape, a right socket (705) used for a ball valve (9) right connecting pipe to stretch into is arranged at the left end of the right sealing cover (701) along the axis of the right sealing cover, a pressure measuring air hole (710) is formed in the bottom surface of the right socket (705) penetrating through the right end face of the right sealing cover (701), a right sealing ring (706) and a right pressing ring (704) are arranged at the opening of the right socket (705), the right pressing ring (704) can translate along the central axis of the right socket (705) in the right socket (705), a first right annular inclined plane (708) which is in an expanded shape along the central axis of the right sealing cover (701) is arranged in the right socket (705), a second right annular inclined plane (707) which is in an expanded shape along the central axis of the right pressing ring (704) is arranged at the right end of the right pressing ring (704), and a right sealing ring positioning groove (709) which is used for positioning the right sealing ring (706) and is in an annular shape is formed between, the right sealing ring (706) is positioned in the right sealing ring positioning groove (709), and the left end of the right pressing ring (704) extends out of the left end face of the right sealing cover (701); the pressure gauge (502) is fixed on the bottom plate (1) through a support, and a pressure measuring interface of the pressure gauge (502) is connected with a pressure measuring air hole (710) of the right sealing cover (701) through an air pipe.
2. A leak detection apparatus for a natural gas ball valve according to claim 1, wherein: the left positioning bayonet (201) and the right positioning bayonet (301) are both U-shaped bayonets with upward openings.
3. A leak detection apparatus for a natural gas ball valve according to claim 1, wherein: the left side of left side positioning seat (2) is gone up and transversely is fixed with two left polished rods (202), and the central axis of two left polished rods (202) all is parallel with the central axis of first lead screw (403), the left and right sides that bulldozes board (602) respectively is equipped with one and bulldozes the board guiding hole, and two bulldoze the board guiding hole and two left polished rods (202) one-to-one and sliding fit, the left and right sides of left side sealed lid (603) respectively is equipped with a left sealed lid guiding hole, and two left sealed lid guiding holes and two left polished rods (202) one-to-one and sliding fit.
4. A leak detection apparatus for a natural gas ball valve according to claim 1, wherein: two right polish rods (302) are transversely fixed on the right side face of the right positioning seat (3), the central axes of the two right polish rods (302) are parallel to the central axis of the second lead screw (503), the left side and the right side of the right sealing cover (701) are respectively provided with a right sealing cover guide hole, and the two right sealing cover guide holes correspond to the two right polish rods (302) one by one and are in sliding fit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810960947.5A CN108871707B (en) | 2018-08-22 | 2018-08-22 | Leakage detection device of natural gas ball valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810960947.5A CN108871707B (en) | 2018-08-22 | 2018-08-22 | Leakage detection device of natural gas ball valve |
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| CN108871707A CN108871707A (en) | 2018-11-23 |
| CN108871707B true CN108871707B (en) | 2020-06-02 |
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| CN201810960947.5A Active CN108871707B (en) | 2018-08-22 | 2018-08-22 | Leakage detection device of natural gas ball valve |
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| CN112924100A (en) * | 2021-02-06 | 2021-06-08 | 河南永祥特检科技有限公司 | Ball valve leakproofness detection device for natural gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5158207A (en) * | 1991-05-15 | 1992-10-27 | Tokheim Corporation | Leak detection device |
| CN105003713B (en) * | 2015-08-11 | 2017-10-24 | 宁波恒元精工管阀科技有限公司 | A kind of ball valve sealing end cap |
| CN105157933A (en) * | 2015-09-11 | 2015-12-16 | 宁波市宇华电器有限公司 | Ball valve sealing testing apparatus |
| CN105651461B (en) * | 2015-12-22 | 2017-11-07 | 中国计量大学 | The sealed valve-testing machine of formula is stretched in one kind |
| 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 |
| CN106979846A (en) * | 2017-06-01 | 2017-07-25 | 陈永杰 | A kind of automatic air tightness testing equipment |
| CN207502130U (en) * | 2017-10-30 | 2018-06-15 | 天津永升阀门有限公司 | A kind of shut-off valve tightness detector |
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Address after: 116000 Community 55, Dalian Economic and Technological Development Zone, Dalian, Liaoning Province Patentee after: Dalian Detai Ganghua Gas Co.,Ltd. Address before: 116000 Community 55, Dalian Economic and Technological Development Zone, Dalian, Liaoning Province Patentee before: Dalian detai Ganghua Gas Co.,Ltd. |
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