CN213599086U - Natural gas line leakage detection device - Google Patents

Abstract

A natural gas pipeline leak detection apparatus comprising: the sealing mechanism and the sensing detection mechanism; the sealing mechanism comprises a first hoop sleeve component and a second hoop sleeve component; a through pipe groove is formed between the first hoop component and the second hoop component; the sensing detection mechanism comprises a base cylinder communicated with the inner cavity of the sealing mechanism, a protective shell connected with the base cylinder, a shell cover connected with the protective shell and a transmission part; the inner side of the shell cover is provided with a pressure sensing element; the transmission piece comprises a pressure bearing part movably accommodated in the base cylinder and a shaft body part connected with the pressure bearing part, the shaft body part movably penetrates through the protective shell, and the edge of the pressure bearing part is attached to the inner wall of the base cylinder; one end of the shaft body part faces the pressure sensing element, and the size of the end face of the shaft body part is close to that of the pressure sensing element. The shaft body part abuts against the pressure sensing element, and one end of the shaft body part fully acts on the pressure sensing element, so that the pressure sensing element can be under the obvious pressure effect, and whether leakage occurs in the natural gas pipeline or not can be accurately identified.

Description

Natural gas line leakage detection device

Technical Field

The utility model relates to a natural gas line detection device especially relates to a natural gas line leakage detection device.

Background

Natural gas refers to all gases naturally occurring in nature, including gases formed by various natural processes in the air space, water space and rock space (including oil field gas, gas field gas, mud volcanic gas, coal bed gas, biogenetic gas and the like). Because the reserves of natural gas are abundant and the pollution is little, the natural gas can be widely used, in particular as the fuel for the life of residents, including conventional natural gas and two unconventional natural gases, namely coal bed gas and shale gas. Natural gas is typically produced and then incorporated into a pipeline through which it is obtained for use in daily life. With the improvement of the living standard of people and the enhancement of environmental awareness, the demand of most cities for natural gas is obviously increased. Natural gas is also more economically profitable as a domestic fuel than an industrial fuel.

The popularization of natural gas can not leave the construction and the maintenance of natural gas line engineering, wherein, in the maintenance work, probably need detect whether natural gas line has the leakage problem, current leakage detection device generally utilizes to take flexible membrane material to lean on inductive element when receiving the atmospheric pressure to drive and take place deformation to whether leak according to the pressure value judgement. However, since the film material has low hardness and is easily deformed, the pressure detected by the sensor is low, resulting in low sensitivity.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need for a natural gas pipeline leakage detection device with improved detection sensitivity.

A natural gas pipeline leak detection apparatus comprising:

a sealing mechanism comprising a first cuff assembly and a second cuff assembly; a pipe through groove is formed between the first hoop sleeve assembly and the second hoop sleeve assembly; and

the sensing detection mechanism comprises a base cylinder communicated with the inner cavity of the sealing mechanism, a protective shell connected with the base cylinder, a shell cover connected with the protective shell and a transmission part; a pressure sensing element is arranged on the inner side of the shell cover; the transmission piece comprises a pressure bearing part movably accommodated in the base cylinder and a shaft body part connected with the pressure bearing part, the shaft body part movably penetrates through the protective shell, and the edge of the pressure bearing part is attached to the inner wall of the base cylinder; one end of the shaft body portion faces the pressure sensing element, and the size of the end face of the shaft body portion is close to that of the pressure sensing element.

Above-mentioned natural gas line leak detection device, first hoop cover subassembly and the lock of second hoop cover subassembly through sealing mechanism are on natural gas line, and natural gas line passes the logical pipe groove, lets the position holding that natural gas pipe is detected in sealing mechanism's inner chamber. The pressure sensing element can reliably act under the action of air pressure without changing the action area of the pressure sensing element due to deformation, the pressure sensing element can be subjected to obvious pressure action, the pressure intensity of the air in the sealing mechanism can be accurately determined according to the pressure parameters detected by the pressure sensing element, and the leakage in a natural gas pipeline can be identified.

In one embodiment, a flexible inner membrane is arranged in the base cylinder, and the inner membrane is arranged between an inner cavity of the sealing mechanism and a pressure-bearing part of the transmission part; the edge of the inner membrane is connected with the inner wall of the base cylinder, and one side surface of the inner membrane is connected with the bearing part of the transmission piece; therefore, under the condition that natural gas leaks, the natural gas can be prevented from leaking to the detection environment, and the safety of detection personnel is ensured.

In one embodiment, the sensing and detecting mechanism further comprises a signal amplifier connected with the pressure sensing element and a data conversion element connected with the signal amplifier; the shell cover is also provided with a display element connected with the data conversion element; the display element is used for displaying the pressure detection value and/or displaying the judgment result of the leakage of the natural gas pipeline; therefore, whether the natural gas pipeline leaks or not can be conveniently confirmed according to the display of the natural gas pipeline.

In one embodiment, the sealing mechanism further comprises a valve body assembly, wherein the valve body assembly comprises an adapter connected with the first hoop and sleeve assembly, a blocking ring rotatably arranged in the adapter, a handle connected with the blocking ring and a valve cover connected with the adapter; an airflow channel communicated to the base cylinder is arranged between the adapter and the valve cover; the blocking ring enables the air flow channel and the inner cavity of the sealing mechanism to be switched between communication and isolation through rotation; the sensing detection mechanism is detachably connected with the adapter; therefore, the sensing detection mechanism can be prevented from being collided in the butt joint process of the first hoop and the second hoop.

In one embodiment, the first cuff assembly comprises a first base housing and a first leak-proof plate detachably connected with the first base housing; the second hoop component comprises a second base shell pivoted with the first base shell and a second leak-proof plate detachably connected with the second base shell; the through pipe groove is formed between the first leakage-proof plate and the second leakage-proof plate; thereby being suitable for natural gas pipelines with different calibers.

In one embodiment, the first ferrule assembly further comprises a first lock pad and a first nut member; a plurality of first convex pins extend from the first base shell, and the first convex pins penetrate through the first leakage-proof plate and the first lock pad; the first nut piece is sleeved on the first convex pin in a threaded manner; the second ferrule assembly further comprises a second lock pad and a second nut member; a plurality of second convex pins extend from the second base shell, and the second convex pins penetrate through the second leakage-proof plate and the second lock pad; the second nut piece is sleeved on the second convex pin in a threaded manner; thereby preventing gas in the sealing mechanism from leaking from a gap between the first base case and the first leakage preventing plate or a gap between the second base case and the second leakage preventing plate.

In one embodiment, the first anti-leakage plate is provided with a plurality of first side slots, and the first convex pins penetrate through the first side slots; the first side open groove extends to the edge of the first leakage-proof plate back to the through pipe groove, and the first side open grooves extend in parallel; the second leak-proof plate is provided with a plurality of second side slots, and the second convex pins penetrate through the second side slots; the second side open groove extends to the edge of the second leakage-proof plate back to the through pipe groove, and the second side open grooves extend in parallel; thereby, the replacement efficiency of the first anti-leakage plate or the second anti-leakage plate can be improved.

In one embodiment, the first base shell is provided with a first positioning strip, the first positioning strip is arranged close to the first convex pin, and the shape of the first positioning strip is close to or consistent with the shape of the edge of the first leakage-proof plate, which faces away from the through pipe groove; the second base shell is provided with a second positioning strip, the second positioning strip is arranged close to the second convex pin, and the shape of the second positioning strip is close to or consistent with the shape of the edge of the second leakage-proof plate back to the through pipe groove; therefore, the positions of the first leak-proof plate or the second leak-proof plate with different calibers can be kept consistent after replacement.

In one embodiment, an arc-shaped convex edge extends from the first leakage-proof plate or the second leakage-proof plate, the arc-shaped convex edge is arranged close to the through pipe groove and extends along the thickness direction of the first leakage-proof plate or the second leakage-proof plate, and the arc-shaped convex edge is used for being attached to the surface of a natural gas pipeline; thereby, the gas in the seal mechanism can be further prevented from leaking from the gap near the natural gas passage groove.

In one embodiment, the method further comprises at least one of the following technical characteristics:

a sealing strip is arranged on the edge of the first base shell, which is used for abutting against the second base shell;

a sealing strip is arranged on the edge of the second base shell, which is used for abutting against the first base shell; thereby preventing gas in the seal mechanism from leaking from the gap between the first base housing and the second base housing.

Drawings

Fig. 1 is a schematic perspective view of a natural gas pipeline leakage detection device according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view of the natural gas pipeline leak detection apparatus shown in FIG. 1 at another angle;

FIG. 3 is an exploded schematic view of the natural gas pipeline leak detection apparatus shown in FIG. 2;

FIG. 4 is a partial schematic view of the natural gas pipeline leak detection apparatus shown in FIG. 2 after separation of the valve body assembly;

FIG. 5 is a partial schematic view of the natural gas pipeline leak detection apparatus shown in FIG. 2 after separation of the valve body assembly;

fig. 6 is a partial schematic view of the sensing mechanism of fig. 2.

The corresponding relation between each reference number and each meaning in the drawings is as follows:

100. a natural gas pipeline leakage detection device; 20. a sealing mechanism; 40. a first ferrule assembly; 41. a first base shell; 410. a through hole; 411. a first boss pin; 412. a first positioning bar; 413. a sealing strip; 414. a boss; 42. a first leakage prevention plate; 421. the first side is provided with a groove; 422. an arc-shaped convex edge; 43. a first lock pad; 44. A first nut member; 50. a second ferrule assembly; 51. a second base shell; 511. a second boss pin; 512. a second positioning bar; 513. a side table; 52. a second leakage prevention plate; 521. a groove is formed in the second side; 53. a second lock pad; 54. A second nut member; 60. a pipe through groove; 80. a valve body assembly; 81. a transfer seat; 82. a blocking ring; 821. a notch; 83. a handle; 84. a valve cover; 841. an air flow channel; 70. a shaft strip; 30. a sensing detection mechanism; 31. A base cylinder; 311. an inner membrane; 32. protecting the shell; 33. a shell cover; 331. a pressure sensing element; 334. a display element; 34. a transmission member; 341. a pressure-bearing portion; 342. a shaft portion.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1 to 6, a natural gas pipeline leakage detecting device 100 according to an embodiment of the present invention is used for detecting whether natural gas leakage occurs in a natural gas pipeline. The natural gas pipeline leakage detection apparatus 100 includes: a sealing mechanism 20 and a sensing mechanism 30; the sealing mechanism 20 includes a first cuff assembly 40 and a second cuff assembly 50; a through pipe groove 60 is formed between the first cuff assembly 40 and the second cuff assembly 50; the sensing detection mechanism 30 comprises a base cylinder 31 communicated with the inner cavity of the sealing mechanism 20, a protective shell 32 connected with the base cylinder 31, a shell cover 33 connected with the protective shell 32 and a transmission piece 34; the inner side of the case cover 33 is provided with a pressure sensing element 331; the transmission member 34 includes a pressure-bearing portion 341 movably accommodated in the base cylinder 31 and a shaft portion 342 connected to the pressure-bearing portion 341, the shaft portion 342 movably penetrates through the casing 32, and an edge of the pressure-bearing portion 341 abuts against an inner wall of the base cylinder 31; one end of the shaft portion 342 faces the pressure sensing element 331, and the end surface of the shaft portion 342 is sized close to the pressure sensing element 331.

The first cuff assembly 40 and the second cuff assembly 50 of the sealing mechanism 20 are buckled on a natural gas pipeline, and the natural gas pipeline passes through the through pipe groove 60, so that the detected part of the natural gas pipe is accommodated in the inner cavity of the sealing mechanism 20. Because the base cylinder 31 is communicated with the inner cavity of the sealing mechanism 20, the transmission piece 34 is movably accommodated in the base cylinder 31 and the protective shell 32, by bringing the edge of the pressure receiving portion 341 into contact with the inner wall of the base cylinder 31, the shield 32 guides the transmission 34, the gas in the sealing mechanism 20 can push the transmission member 34 through the pressure-bearing portion 341, the shaft portion 342 abuts against the pressure sensing element 331, since one end of the shaft portion 342 fully acts on the pressure sensing element 331, and the cross-sectional area of the pressure receiving portion 341 is larger than that of the shaft portion 342, the pressure sensing element 331 can reliably operate under the action of air pressure without changing the acting area of the pressure sensing element 331 due to deformation, and the pressure sensing element 331 can be exposed to a relatively significant pressure, the pressure of the gas in the sealing mechanism 20 can be accurately determined according to the pressure parameter detected by the pressure sensing element 331, thereby being beneficial to identifying whether leakage occurs in the natural gas pipeline.

Specifically, the pressure sensing element 331 is a piezoceramic wafer.

Referring to fig. 6, in one embodiment, a flexible inner membrane 311 is disposed in the base cylinder 31, and the inner membrane 311 is disposed between an inner cavity of the sealing mechanism 20 and the pressure-receiving portion 341 of the transmission member 34; the edge of the inner film 311 is connected to the inner wall of the base cylinder 31, and one side surface of the inner film 311 is connected to the pressure receiving portion 341 of the transmission member 34. Through the isolation of inner membrance 311, can avoid the gas in the sealing mechanism 20 to leak through sensing detection mechanism 30, under the circumstances that has the natural gas to leak, can prevent that the natural gas from leaking to the testing environment, guarantee measurement personnel's safety, can improve sensing detection mechanism 30's detection accuracy simultaneously, avoid because the gas leaks and can't drive driving medium 34 and remove.

In one embodiment, the sensing mechanism 30 further includes a signal amplifier connected to the pressure sensing element 331 and a data conversion element connected to the signal amplifier; the shell cover 33 is also provided with a display element 334 connected with the data conversion element; the display element 334 is used for displaying the pressure detection value of the pressure sensing element 331 and/or displaying the judgment result of the data conversion element on the natural gas pipeline leakage. So that it is possible to easily confirm whether the leakage of the natural gas pipeline occurs according to the display of the display element 334. Alternatively, the display element 334 is an electronic element having a display function, such as an LED lamp, a nixie tube, an LED screen, or an LCD screen.

Referring to fig. 3 to 5, in one embodiment, the sealing mechanism 20 further includes a valve body assembly 80, the valve body assembly 80 includes an adapter 81 connected to the first base housing 41, a blocking ring 82 rotatably disposed in the adapter 81, a handle 83 connected to the blocking ring 82, and a valve cover 84 connected to the adapter 81; an air flow channel 841 communicated with the base cylinder 31 is arranged between the adapter 81 and the valve cover 84; the blocking ring 82 rotates to switch the gas flow channel 841 from the inner cavity of the sealing mechanism 20 between communication and isolation; the sensing mechanism 30 is detachably connected to the adaptor 81.

By rotating the blocker ring 82, when the notch 821 on the blocker ring 82 is aligned with the through hole 410 and the air flow channel 841 of the first base shell 41, respectively, the base cylinder 31 is communicated to the inner cavity of the sealing mechanism 20 through the air flow channel 841, and the air flow enters the base cylinder 31 to push the transmission member 34. After the handle 83 is pulled, the notch 821 on the blocking ring 82 is separated from the through hole 410 of the first base shell 41, the blocking ring 82 blocks the through hole 410 on the first base shell 41, and the inner cavity of the sealing mechanism 20 is completely sealed, so that the sensor detection mechanism can be mounted on the first base shell 41 after the sealing mechanism 20 is mounted on the natural gas pipeline, and the sensor detection mechanism 30 is prevented from being collided during the butt joint process of the first ferrule assembly 40 and the second ferrule assembly 50. Meanwhile, the sensing detection mechanism 30 can be respectively butted with a plurality of different sealing mechanisms 20, so that the cost of the natural gas pipeline leakage detection device 100 is reduced.

Referring to fig. 3, in one embodiment, the first cuff assembly 40 includes a first base shell 41 and a first anti-leakage plate 42 detachably connected to the first base shell 41, the first anti-leakage plate 42 is disposed at two sides of the inner cavity of the first base shell 41 in pairs; the second cuff assembly 50 comprises a second base shell 51 pivotally connected to the first base shell 41 and a second anti-leakage plate 52 detachably connected to the second base shell 51, wherein the second anti-leakage plate 52 is arranged at two sides of the inner cavity of the second base shell 51 in pairs; a duct groove 60 is formed between the first leakage prevention plate 42 and the second leakage prevention plate 52.

After the first base shell 41 and the second base shell 51 are attached to each other by rotation, the natural gas pipeline passes through the through pipe groove 60, the edges of the first leakage-proof plate 42 and the second leakage-proof plate 52 are attached to the surface of the natural gas pipeline, and when the natural gas pipeline has leakage, the natural gas leaking from the pipeline can be prevented from flowing out of the sealing mechanism 20; because the first anti-leakage plate 42 and the second anti-leakage plate 52 are detachably connected with the first base shell 41 and the second base shell 51, the diameter of the through pipe groove 60 can be adjusted by replacing the first anti-leakage plate 42 and the second anti-leakage plate 52, so that the natural gas pipeline can adapt to natural gas pipelines with different calibers.

Referring to fig. 3, in one embodiment, the first ferrule assembly 40 further includes a first lock pad 43 and a first nut member 44; a plurality of first protruding pins 411 extend from the first base shell 41, and the first protruding pins 411 penetrate through the first anti-leakage plate 42 and the first lock pad 43; the first nut pieces 44 correspond to the first convex pins 411 one by one, and are sleeved on the first convex pins 411 in a threaded manner; the first leak-proof plate 42 and the first lock pad 43 are sequentially disposed between the first base case 41 and the first nut member 44; the second ferrule assembly 50 further includes a second lock pad 53 and a second nut member 54; a plurality of second protruding pins 511 extend from the second base shell 51, and the second protruding pins 511 penetrate through the second anti-leakage plate 52 and the second lock pad 53; the second nut members 54 correspond to the second convex pins 511 one by one, and are sleeved on the second convex pins 511 in a threaded manner; the second leakage preventing plate 52 and the second locking pad 53 are sequentially disposed between the second base housing 51 and the second nut member 54.

The first protruding pin 411 protrudes out of the first base case 41, and the first nut member 44 and the first gasket 43 push the first anti-leakage plate 42, so that the first anti-leakage plate 42 is reliably attached to the outer side of the first base case 41, and the gas in the sealing mechanism 20 is prevented from leaking from the gap between the first base case 41 and the first anti-leakage plate 42. Similarly, the gas in the sealing mechanism 20 can be prevented from leaking from the gap between the second base case 51 and the second leakage preventing plate 52.

Referring to fig. 1 and 3, in one embodiment, the first anti-leakage plate 42 has a plurality of first side slots 421, the first side slots 421 correspond to the first protruding pins 411 one by one, and the first protruding pins 411 are inserted into the first side slots 421; the first side open slots 421 extend to the edge of the first leakage-proof plate 42 opposite to the through pipe slot 60, and the first side open slots 421 extend in parallel; the second anti-leakage plate 52 is provided with a plurality of second side open slots 521, the second side open slots 521 correspond to the second convex pins 511 one by one, and the second convex pins 511 are arranged in the second side open slots 521 in a penetrating manner; the second side open slots 521 extend to the edge of the second leakage-proof plate 52 opposite to the through-pipe slot 60, and the second side open slots 521 extend in parallel.

Since the first side open groove 421 extends to the edge of the first leakage preventing plate 42, the first leakage preventing plate 42 can be removed or replaced from the first protruding pin 411 by loosening the first nut member 44 and leaving a gap for the first leakage preventing plate 42 to move along the radial direction of the first protruding pin 411, thereby avoiding the need to completely remove the first nut member 44 or the first lock washer 43 from the first protruding pin 411, and improving the replacement efficiency of the first leakage preventing plate 42 or the second leakage preventing plate 52.

Referring to fig. 3, in one embodiment, the first base case 41 has a first positioning bar 412, the first positioning bar 412 is disposed near the first protruding pin 411, and the shape of the first positioning bar 412 is close to or consistent with the edge of the first anti-leakage plate 42 facing away from the through-pipe slot 60; the second base housing 51 has a second positioning bar 512, the second positioning bar 512 is disposed near the second protruding pin 511, and the shape of the second positioning bar 512 is close to or identical to the shape of the edge of the second leakage-proof plate 52 facing away from the through-tube slot 60.

When the first leakage preventing plate 42 is mounted on the first base case 41, the first positioning rib 412 abuts against the edge of the first leakage preventing plate 42, and when the second leakage preventing plate 52 is mounted on the second base case 51, the second positioning rib 512 abuts against the edge of the second leakage preventing plate 52, so that the positions of the first leakage preventing plate 42 or the second leakage preventing plate 52 with different calibers can be kept consistent after replacement.

Referring to fig. 3, in one embodiment, an arc-shaped convex edge 422 extends from the first anti-leakage plate 42 or the second anti-leakage plate 52, the arc-shaped convex edge 422 is disposed near the pipe passing groove 60 and extends along the thickness direction of the first anti-leakage plate 42 or the second anti-leakage plate 52, and the arc-shaped convex edge 422 is used for being attached to the surface of the natural gas pipeline. By arranging the arc-shaped convex edge 422 on the first leakage-proof plate 42 or the second leakage-proof plate 52, when the first leakage-proof plate 42 contacts with the second leakage-proof plate 52, the arc-shaped convex edge 422 is attached to the surface of the natural gas pipeline, so that the contact area between the first leakage-proof plate 42 or the second leakage-proof plate 52 and the surface of the natural gas pipeline is increased, and the gas in the sealing mechanism 20 is further prevented from leaking from the gap near the natural gas passing groove.

Referring to fig. 3, in one of the above-mentioned modes, a sealing strip 413 is disposed on an edge of the first base shell 41 for abutting against the second base shell 51.

In one of the described ways, the edge of the second base shell 51 for abutment with the first base shell 41 is provided with a sealing strip 413. By providing the flexible sealing strip 413 on the abutting edge of the first base shell 41 and the second base shell 51, after the first base shell 41 and the second base shell 51 are closed, the sealing strip 413 fills the gap between the first base shell 41 and the second base shell 51, thereby preventing the gas in the sealing mechanism 20 from leaking from the gap between the first base shell 41 and the second base shell 51.

In one embodiment, a boss 414 extends from one side of the first base shell 41; a side table 513 extends from one side of the second base housing 51; the sealing mechanism 20 further includes a shaft strip 70, and the shaft strip 70 is respectively disposed on the boss 414 and the side block 513. A gap is formed between the shaft strip 70 and the boss 414 or the side table 513, so that the first base shell 41 and the second base shell 51 can be pivoted; specifically, when it is necessary to fix the seal mechanism 20 to the natural gas pipeline, the other side of the first base housing 41 and one side of the second base housing 51 are clamped and fixed by screw members.

In this embodiment, the first cuff assembly 40 and the second cuff assembly 50 of the sealing mechanism 20 are fastened to the natural gas pipeline, and the natural gas pipeline passes through the through pipe groove 60, so that the detected portion of the natural gas pipe is accommodated in the inner cavity of the sealing mechanism 20. Because the base cylinder 31 is communicated with the inner cavity of the sealing mechanism 20, the transmission piece 34 is movably accommodated in the base cylinder 31 and the protective shell 32, by bringing the edge of the pressure receiving portion 341 into contact with the inner wall of the base cylinder 31, the shield 32 guides the transmission 34, the gas in the sealing mechanism 20 can push the transmission member 34 through the pressure-bearing portion 341, the shaft portion 342 abuts against the pressure sensing element 331, since one end of the shaft portion 342 fully acts on the pressure sensing element 331, and the cross-sectional area of the pressure receiving portion 341 is larger than that of the shaft portion 342, the pressure sensing element 331 can reliably operate under the action of air pressure without changing the acting area of the pressure sensing element 331 due to deformation, and the pressure sensing element 331 can be exposed to a relatively significant pressure, the pressure of the gas in the sealing mechanism 20 can be accurately determined according to the pressure parameter detected by the pressure sensing element 331, thereby being beneficial to identifying whether leakage occurs in the natural gas pipeline.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A natural gas pipeline leak detection device, comprising:

a sealing mechanism comprising a first cuff assembly and a second cuff assembly; a pipe through groove is formed between the first hoop sleeve assembly and the second hoop sleeve assembly; and

the sensing detection mechanism comprises a base cylinder communicated with the inner cavity of the sealing mechanism, a protective shell connected with the base cylinder, a shell cover connected with the protective shell and a transmission part; a pressure sensing element is arranged on the inner side of the shell cover; the transmission piece comprises a pressure bearing part movably accommodated in the base cylinder and a shaft body part connected with the pressure bearing part, the shaft body part movably penetrates through the protective shell, and the edge of the pressure bearing part is attached to the inner wall of the base cylinder; one end of the shaft body portion faces the pressure sensing element, and the size of the end face of the shaft body portion is close to that of the pressure sensing element.

2. The natural gas pipeline leakage detection device according to claim 1, wherein a flexible inner membrane is provided in the base cylinder, and the inner membrane is provided between an inner cavity of the sealing mechanism and a pressure-receiving portion of the transmission member; the edge of the inner membrane is connected with the inner wall of the base cylinder, and one side surface of the inner membrane is connected with the bearing part of the transmission piece.

3. The natural gas pipeline leakage detection device of claim 1, wherein the sensing detection mechanism further comprises a signal amplifier connected to the pressure sensing element and a data conversion element connected to the signal amplifier; the shell cover is also provided with a display element connected with the data conversion element; the display element is used for displaying the pressure detection value and/or displaying the judgment result of the natural gas pipeline leakage.

4. The natural gas pipeline leakage detection device of claim 1, wherein the sealing mechanism further comprises a valve body assembly, the valve body assembly comprising an adapter connected to the first ferrule assembly, a blocker ring rotatably disposed in the adapter, a handle connected to the blocker ring, and a valve cap connected to the adapter; an airflow channel communicated to the base cylinder is arranged between the adapter and the valve cover; the blocking ring enables the air flow channel and the inner cavity of the sealing mechanism to be switched between communication and isolation through rotation; the sensing detection mechanism is detachably connected with the adapter.

5. The natural gas pipeline leak detection apparatus of claim 4, wherein the first cuff assembly includes a first base shell and a first leak-proof plate detachably connected to the first base shell; the second hoop component comprises a second base shell pivoted with the first base shell and a second leak-proof plate detachably connected with the second base shell; the through pipe groove is formed between the first leakage-proof plate and the second leakage-proof plate.

6. The natural gas pipeline leak detection apparatus of claim 5, wherein the first collar assembly further comprises a first lock pad and a first nut member; a plurality of first convex pins extend from the first base shell, and the first convex pins penetrate through the first leakage-proof plate and the first lock pad; the first nut piece is sleeved on the first convex pin in a threaded manner; the second ferrule assembly further comprises a second lock pad and a second nut member; a plurality of second convex pins extend from the second base shell, and the second convex pins penetrate through the second leakage-proof plate and the second lock pad; the second nut piece is sleeved on the second convex pin in a threaded mode.

7. The natural gas pipeline leakage detection device of claim 6, wherein the first leakage prevention plate is provided with a plurality of first side slots, and the first protruding pin is arranged in the first side slots in a penetrating manner; the first side open groove extends to the edge of the first leakage-proof plate back to the through pipe groove, and the first side open grooves extend in parallel; the second leak-proof plate is provided with a plurality of second side slots, and the second convex pins penetrate through the second side slots; the second side open groove extends to the edge of the second leakage-proof plate back to the through pipe groove, and the second side open grooves extend in parallel.

8. The natural gas pipeline leakage detecting device of claim 6, wherein the first base shell has a first positioning bar, the first positioning bar is arranged near the first protruding pin, and the shape of the first positioning bar is close to or consistent with the shape of the edge of the first leakage-proof plate, which faces away from the through pipe groove; the second base shell is provided with a second positioning strip, the second positioning strip is arranged close to the second convex pin, and the shape of the second positioning strip is close to or consistent with the shape of the edge of the second leakage-proof plate back to the through pipe groove.

9. The natural gas pipeline leakage detection device of claim 5, wherein an arc-shaped convex edge extends from the first leakage prevention plate or the second leakage prevention plate, the arc-shaped convex edge is disposed near the through pipe groove and extends along a thickness direction of the first leakage prevention plate or the second leakage prevention plate, and the arc-shaped convex edge is used for being attached to the surface of the natural gas pipeline.

10. The natural gas pipeline leak detection apparatus of claim 5, further comprising at least one of the following technical features:

a sealing strip is arranged on the edge of the first base shell, which is used for abutting against the second base shell;

and a sealing strip is arranged on the edge of the second base shell, which is used for being abutted against the first base shell.

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