Sealing performance detection device for pipeline flange plate interface

Abstract

The invention provides a sealing performance detection device for a pipeline flange plate interface, the sealing performance detection device for the pipeline flange plate interface comprises an inner box, an outer box, a pressurizing and pressure maintaining assembly and a pressure detection assembly, the inner box is formed by buckling two inner half boxes, and the inner box is suitable for covering the outer side of the flange plate interface and is in sealing fit with a pipeline; the outer box is formed by buckling two transparent outer half boxes, and the outer box is suitable for covering the outer side of the inner box and is in sealing fit with a pipeline; the pressure detection assembly is connected with the inner half box and is used for detecting the pressure in the inner box; and the pressurizing and pressure maintaining assembly is connected with the inner half box and is used for filling colored gas / smoke into the inner half box until the preset pressure is reached in the inner half box and maintaining the pressure. According to the sealing performance detection device for the pipeline flange plate interface provided by the invention, whether the inner box is well sealed or not can be visually observed during detection, so that the misjudgment condition caused by the sealing problem of the inner box is effectively avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of sealing detection, and in particular relates to a sealing detection device for a pipeline flange interface. Background Art

[0002] Water, natural gas, liquefied petroleum gas, etc. usually need to be transported through pipelines, and pipelines are usually connected by flanges. Such pipelines usually have high requirements for sealing, so it is usually necessary to test the sealing of the flange interface of the pipeline.

[0003] At present, when testing the sealing performance of the flange interface of the pipeline, a sealing box is usually placed at the flange connection port, the sealing box is pressurized and maintained for a period of time, and the pressure change is detected by a pressure sensor. If the pressure does not decrease, it means that the sealing performance of the pipeline flange interface is good. If the pressure decreases, it means that the sealing performance of the pipeline flange interface is insufficient.

[0004] However, when using the above method for detection, it is necessary to ensure that the connection between the sealing box and the pipeline is well sealed. If the connection between the sealing box and the pipeline is not well sealed during installation, even if the pipeline flange contact seal is good during the pressure maintenance stage, it will cause the pressure in the sealing box to decrease, leading to misjudgment. Summary of the invention

[0005] The present invention provides a sealing detection device for a pipeline flange interface, aiming to solve the technical problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a sealing detection device for a pipeline flange interface, comprising an inner box, an outer box, a pressurizing and pressure-maintaining component and a pressure detection component, wherein the inner box is formed by two inner half boxes snapping together, and the inner box is suitable for being covered on the outside of the flange interface and sealingly cooperating with the pipeline; the outer box is formed by two transparent outer half boxes snapping together, and the outer box is suitable for being covered on the outside of the inner box and sealingly cooperating with the pipeline; the pressure detection component is connected to the inner half box to detect the pressure inside the inner box; the pressurizing and pressure-maintaining component is connected to the inner half box to fill the inner box with colored gas / smoke until the inner box reaches a preset pressure and maintains the pressure.

[0007] In a possible implementation of the sealing detection device for the pipeline flange interface provided by the present invention, two adjacent inner wall surfaces of the outer box in the radial direction of the pipeline are provided with a colored layer, and the color of the colored layer is opposite to the color of the colored gas / smoke.

[0008] In a possible implementation of the sealing detection device for the pipe flange interface provided by the present invention, it also includes four first sealing components, which are respectively arranged between the joint surfaces of the two inner half boxes and the two outer half boxes, and the first sealing components include a sealing strip, and the joint surfaces of the two inner half boxes and the joint surfaces of the two outer half boxes are both provided with first sealing grooves, and the sealing strip is embedded in the first sealing groove.

[0009] In a possible implementation of the sealing detection device for the pipe flange interface provided by the present invention, telescopic sacs are provided on both sides of the sealing strip, the telescopic sacs are connected to the sealing strip, a receiving groove is provided on the side of the first sealing groove facing away from the joint surface, the telescopic sacs are suitable for being placed in the receiving groove, and are suitable for filling the receiving groove by expansion.

[0010] In a possible implementation of the sealing detection device for the pipeline flange interface provided by the present invention, the first sealing assembly also includes a sealing gasket, which is clamped between the two inner half boxes and between the two outer half boxes.

[0011] In a possible implementation of the sealing detection device for the pipe flange interface provided by the present invention, the first sealing component also includes an elastic band, one side of the telescopic bag is connected to the sealing strip and is suitable for expanding toward the side facing away from the sealing strip, and the two ends of the elastic band in the width direction respectively bypass the tops of the two telescopic bags and are connected to the side of the telescopic bag facing away from the sealing strip.

[0012] In a possible implementation of the sealing detection device for the pipe flange interface provided by the present invention, the pressurization and pressure maintaining component includes a valve, an air pump and a gas storage bottle. One end of the valve is connected to the interior of the inner box, and the other end is connected to the air pump. The air pump is connected to the gas storage bottle and is used to pump the colored gas / smoke in the gas storage bottle into the inner box.

[0013] In a possible implementation of the sealing detection device for the pipe flange interface provided by the present invention, it also includes four second sealing components, which are respectively arranged at the two ends of the inner box and the outer box, and the second sealing components include two semi-annular sacs, which are arranged between the inner half box or the outer half box and the pipeline, and the two ends of the two semi-annular sacs are mutually clamped to form an annular sealing sac; the semi-annular sacs can be expanded and contracted in the radial and circumferential directions.

[0014] In a possible implementation of the sealing detection device for the pipe flange interface provided by the present invention, a second sealing groove is circumferentially provided on the inner surface of the semi-annular sac body, a plurality of glue outlet holes are provided at the bottom of the second sealing groove, and a diaphragm is axially provided inside the semi-annular sac body to divide the interior of the semi-annular sac body radially from the inside to the outside into a receiving chamber and a pressure chamber, and the receiving chamber is suitable for storing colloid.

[0015] In a possible implementation of the sealing detection device for the pipeline flange interface provided by the present invention, a plurality of elastic members are further provided in the accommodating cavity, and the elastic members are arranged at intervals in the accommodating cavity to provide radial supporting force.

[0016] The beneficial effects of the sealing detection device for the pipeline flange interface provided by the present invention are as follows: compared with the prior art, the sealing detection device for the pipeline flange interface provided by the present invention has an inner box and an outer box sequentially sealed on the outside of the pipeline flange interface. During the detection, the two inner half boxes are first buckled on the outside of the pipeline flange interface and sealed with the pipeline; then the two outer half boxes are buckled on the outside of the inner half box and sealed with the pipeline, and then colored gas / smoke is filled into the inner box through the pressurizing and pressure-maintaining component until the preset pressure in the inner box is reached and the pressure is maintained for a period of time; since the outer half box is a transparent box, if the inner box If the seal is not good, colored gas / smoke will overflow from the inner box into the outer box and be observed; if no colored gas / smoke overflows from the inner box and the inner box pressure detected by the pressure detection component is constant, it means that the pipe flange interface is well sealed; if no colored gas / smoke overflows from the inner box and the inner box pressure detected by the pressure detection component decreases, it means that the seal at the pipe flange interface is unqualified; that is, the sealing detection device for the pipe flange interface provided by the embodiment of the present invention can intuitively observe whether the inner box is well sealed during detection, thereby effectively avoiding misjudgment caused by inner box sealing problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the three-dimensional structure of a sealing detection device for a pipeline flange interface provided by an embodiment of the present invention; Figure 2 A schematic cross-sectional view of a sealing detection device for a pipeline flange interface provided by an embodiment of the present invention; Figure 3 For along Figure 2 The cross-sectional structure diagram along the AA line; Figure 4 for Figure 3 A magnified view of part B in FIG. Figure 5 A schematic diagram of the three-dimensional structure of a semi-ring capsule in a sealing detection device for a pipeline flange interface provided by an embodiment of the present invention; Figure 6A schematic cross-sectional view of a semi-annular capsule in a sealing detection device for a pipeline flange interface provided by an embodiment of the present invention; Figure 7 for Figure 6 The enlarged view of the C part in FIG. Description of reference numerals: 11. Inner half box; 12. Outer half box; 20. Pressure detection assembly; 30. First sealing assembly; 31. Sealing strip; 32. Telescopic bag; 33. Sealing pad; 34. Elastic band; 41. Valve; 42. air pump; 43. gas storage bottle; 50. semi-annular bladder; 51. diaphragm; 52. Accommodating chamber; 53. Pressure chamber; 54. Second sealing groove; 55. Elastic member; 56. Glue outlet hole. DETAILED DESCRIPTION

[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0021] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0022] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0023] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, and the spatially relative descriptions used here are interpreted accordingly.

[0024] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0025] The sealing detection device for the pipeline flange interface provided by the present invention is now described.

[0026] Embodiment 2: Please also read Figure 1 to Figure 2 The sealing detection device of the pipeline flange interface includes an inner box, an outer box, a pressurizing and pressure-maintaining component and a pressure detection component 20. The inner box is formed by two inner half boxes 11 snapped together, and the inner box is suitable for being covered on the outside of the flange interface and sealingly cooperating with the pipeline. The outer box is formed by two transparent outer half boxes 12 snapped together, and the outer box is suitable for being covered on the outside of the inner box and sealingly cooperating with the pipeline. The pressure detection component 20 is connected to the inner half box 11 and is used to detect the pressure inside the inner box. The pressurizing and pressure-maintaining component is connected to the inner half box 11 and is used to fill the inner box with colored gas / smoke until the inner box reaches a preset pressure and maintains the pressure.

[0027] Specifically, the pressure detection component 20 is an existing device for detecting air pressure, such as a pressure sensor and a pressure gauge.

[0028] In a specific implementation of the sealing detection device for the pipeline flange interface provided by an embodiment of the present invention, a colored layer is provided on two adjacent inner wall surfaces of the outer box in the radial direction of the pipeline, and the color of the colored layer is opposite to the color of the colored gas / smoke.

[0029] Specifically, the two outer half boxes 12 are distributed up and down and connected together to form an outer box. In this state, a colored layer is provided on the bottom of the outer box and the side wall away from the operator, and the color of the colored layer is opposite to the color of the colored gas / smoke, so that the colored gas / smoke can be quickly observed when it overflows.

[0030] The beneficial effect of the sealing detection device for the pipe flange interface provided by the present invention is as follows: compared with the prior art, the sealing detection device for the pipe flange interface provided by the present invention has an inner box and an outer box sealed in sequence on the outside of the pipe flange interface. During detection, the two inner half boxes 11 are first buckled onto the outside of the pipe flange interface and sealed with the pipe; then the two outer half boxes 12 are buckled onto the outside of the inner half box 11 and sealed with the pipe.

[0031] Then, colored gas / smoke is filled into the inner box through the pressurizing and maintaining component until the preset pressure is reached in the inner box and the pressure is maintained for a period of time; since the outer half box 12 is a transparent box, if the inner box is not sealed well, the colored gas / smoke will overflow from the inner box into the outer box and be observed.

[0032] If there is no colored gas / smoke overflowing from the inner box and the inner box pressure detected by the pressure detection assembly 20 is constant, it means that the pipeline flange interface is well sealed.

[0033] If there is no colored gas / smoke overflowing from the inner box and the inner box pressure detected by the pressure detection assembly 20 decreases, it means that the seal at the pipeline flange interface is unqualified.

[0034] That is, the sealing detection device for the pipeline flange interface provided by the embodiment of the present invention can visually observe whether the inner box is well sealed during detection, thereby effectively avoiding misjudgment caused by inner box sealing problems.

[0035] Embodiment 2: Please also read Figures 1 to 7 The sealing detection device of the pipeline flange interface includes an inner box, an outer box, a pressurizing and pressure-maintaining component and a pressure detection component 20. The inner box is formed by two inner half boxes 11 snapped together, and the inner box is suitable for being covered on the outside of the flange interface and sealingly cooperating with the pipeline. The outer box is formed by two transparent outer half boxes 12 snapped together, and the outer box is suitable for being covered on the outside of the inner box and sealingly cooperating with the pipeline. The pressure detection component 20 is connected to the inner half box 11 and is used to detect the pressure inside the inner box. The pressurizing and pressure-maintaining component is connected to the inner half box 11 and is used to fill the inner box with colored gas / smoke until the inner box reaches a preset pressure and maintains the pressure.

[0036] Specifically, the pressure detection component 20 is an existing device for detecting air pressure, such as a pressure sensor and a pressure gauge.

[0037] In a specific implementation of the sealing detection device for the pipeline flange interface provided by an embodiment of the present invention, a colored layer is provided on two adjacent inner wall surfaces of the outer box in the radial direction of the pipeline, and the color of the colored layer is opposite to the color of the colored gas / smoke.

[0038] Specifically, the two outer half boxes 12 are distributed up and down and connected together to form an outer box. In this state, a colored layer is provided on the bottom of the outer box and the side wall away from the operator, and the color of the colored layer is opposite to the color of the colored gas / smoke, so that the colored gas / smoke can be quickly observed when it overflows.

[0039] like Figure 1 and Figure 3 As shown, in a specific implementation manner of the sealing detection device for the pipeline flange interface provided in an embodiment of the present invention, it also includes four first sealing components 30, and the four first sealing components 30 are respectively arranged between the joint surfaces of the two inner half boxes 11 and the two outer half boxes 12. The first sealing component 30 includes a sealing strip 31, and the joint surfaces of the two inner half boxes 11 and the joint surfaces of the two outer half boxes 12 are both provided with first sealing grooves, and the sealing strip 31 is embedded in the first sealing grooves.

[0040] Specifically, the lower half of the sealing strip 31 is embedded in the first sealing groove of an inner half box 11 or an outer half box 12, and the upper half is embedded in the first sealing groove on the other inner half box 11 or the outer half box 12 to seal the side of the inner half box 11 or the outer half box 12.

[0041] Further, such as Figure 3 and Figure 4 As shown, in a specific implementation of the sealing detection device for the pipe flange interface provided by an embodiment of the present invention, telescopic bladders 32 are provided on both sides of the sealing strip 31, the telescopic bladders 32 are connected to the sealing strip 31, and a receiving groove is provided on the side of the first sealing groove facing away from the joint surface, the telescopic bladder 32 is suitable for being placed in the receiving groove, and is suitable for filling the receiving groove by expansion.

[0042] Specifically, a switch valve is provided on the end of the telescopic bladder 32. The telescopic bladder 32 can be expanded by opening the switch valve to pump gas into the telescopic bladder 32 through the air pump 42 or by pumping liquid into the telescopic bladder 32 through the hydraulic pump; and can be contracted by opening the switch valve.

[0043] The sealing strip 31 is also a capsule structure, connecting the two telescopic capsules 32 , and the sealing strip 31 can only be telescoped in the thickness direction. In the figure, the horizontal direction is the thickness direction of the sealing strip 31 .

[0044] It should be noted that in the initial state, the telescopic bladder 32 can directly pass through the first sealing groove and enter the containing groove; then, gas is pumped into the telescopic bladder 32 through the air pump 42 or liquid is pumped into the telescopic bladder 32 through the hydraulic pump to expand the telescopic bladder 32 and fill the containing groove.

[0045] In this way, on the one hand, the two inner half boxes 11 or the two outer half boxes 12 are connected together by the telescopic bag body 32 stuck in the two receiving grooves and the sealing strip 31 connecting the two telescopic bag bodies 32, without the need for multiple bolts, so that disassembly and assembly are more convenient and quick; on the other hand, the telescopic bag body 32 fills the receiving groove and fits tightly with the inner wall of the receiving groove, which can further improve the sealing performance.

[0046] As Figure 3 and Figure 4 As shown, in a specific implementation of the sealing detection device for the pipeline flange interface provided by an embodiment of the present invention, the first sealing assembly 30 also includes a sealing gasket 33, which is clamped between the two inner half boxes 11 and between the two outer half boxes 12.

[0047] Furthermore, Figure 3 and Figure 4 As shown, in a specific implementation of the sealing detection device for the pipe flange interface provided by an embodiment of the present invention, the first sealing component 30 also includes an elastic band 34, one side of the telescopic bag 32 is connected to the sealing strip 31, and is suitable for expanding toward the side facing away from the sealing strip 31, and the two ends of the elastic band 34 in the width direction respectively bypass the tops of the two telescopic bags 32 and are connected to the side of the telescopic bags 32 facing away from the sealing strip 31.

[0048] It should be noted that after the expansion of the telescopic bag 32, it will pull the two ends of the elastic band 34, thereby driving the inner half box 11 or the outer half box 12 to squeeze the sealing gasket 33, so that there is a certain pre-tightening force between the inner half box 11 or the outer half box 12 and the sealing gasket 33, further improving the sealing effect.

[0049] like Figure 1 and Figure 2 As shown, in a specific implementation manner of the sealing detection device for the pipe flange interface provided in an embodiment of the present invention, the pressurization and pressure maintaining component includes a valve 41, an air pump 42 and a gas cylinder 43. One end of the valve 41 is connected to the interior of the inner box, and the other end is connected to the air pump 42. The air pump 42 is connected to the gas cylinder 43, and is used to pump the colored gas / smoke in the gas cylinder 43 into the inner box.

[0050] It should be noted that the air pump 42 is a bidirectional pump, which can pump the colored gas / smoke in the gas cylinder 43 into the inner box for sealing detection, and can also pump the colored gas / smoke in the inner box into the gas cylinder 43 to recycle the colored gas / smoke, saving resources and avoiding environmental pollution.

[0051] like Figure 1 and Figure 5 As shown, in a specific implementation manner of the sealing detection device for the pipeline flange interface provided by an embodiment of the present invention, four second sealing components are also included, which are respectively arranged at the two ends of the inner box and the outer box, and the second sealing components include two semi-annular sacs 50, and the semi-annular sacs 50 are arranged between the inner half box 11 or the outer half box 12 and the pipeline, and the two ends of the two semi-annular sacs 50 are mutually clamped to form an annular sealing sac; the semi-annular sacs 50 can expand and contract in the radial and circumferential directions, so as to cooperate with pipelines of different diameters through contraction and expansion, so that the device can detect pipelines of different diameters, thereby improving the universality of the device.

[0052] Specifically, a switch valve is provided on the end of the semi-annular sac 50. By opening the switch valve, the air pump 42 pumps gas into the semi-annular sac 50 or by pumping liquid into the semi-annular sac 50 through a hydraulic pump, the semi-annular sac 50 can be expanded; by opening the switch valve, the semi-annular sac 50 can be contracted.

[0053] Specifically, Figures 5 to 7 As shown, in a specific implementation of the sealing detection device for the pipe flange interface provided by an embodiment of the present invention, a second sealing groove 54 is circumferentially provided on the inner ring surface of the semi-annular sac 50, and a plurality of glue outlet holes 56 are provided at the bottom of the second sealing groove 54. A diaphragm 51 is axially provided inside the semi-annular sac 50 to radially divide the interior of the semi-annular sac 50 from the inside to the outside into a receiving chamber 52 and a pressure chamber 53, and the receiving chamber 52 is suitable for storing colloid.

[0054] Further, such as Figure 7As shown, in a specific implementation of the sealing detection device for the pipe flange interface provided by an embodiment of the present invention, a plurality of elastic members 55 are further provided in the accommodating cavity 52, and the elastic members 55 are arranged at intervals in the accommodating cavity 52 to provide radial supporting force.

[0055] Specifically, the elastic member 55 is a spring, a sponge block, an elastic block, etc. Preferably, the elastic member 55 is a spring.

[0056] It should be noted that the colloid in the accommodating cavity 52 is a crystal mud-like colloid with certain fluidity but low viscosity, so that when the device is dismantled, the colloid can be separated from the pipeline for reuse. The pipeline surface is usually rough, and it is difficult to fully fit the pipeline surface with a traditional rubber ring seal, so it is easy to have insufficient sealing. In this embodiment, on the one hand, the semi-annular capsule 50 is squeezed and fitted with the pipeline surface for sealing. At the same time, a first sealing groove is set in the middle of the semi-annular capsule 50, which is filled with colloid to further improve the sealing.

[0057] When installing the device, the two semi-annular sacs 50 are spliced ​​and placed between the end of the inner box or the outer box and the pipeline; thereafter, gas or liquid is filled into the pressure chamber 53 of the semi-annular sac 50 to expand the semi-annular sac 50 until it abuts against the pipeline, and during this process, the accommodating chamber 52 is expanded by the internal elastic member 55; the pressure chamber 53 is continuously filled with gas or liquid, the accommodating chamber 52 is compressed, and the internal colloid is squeezed out from the colloid outlet hole 56 and enters the second sealing groove 54 to fill the space between the semi-annular sac 50 and the pipeline, thereby effectively ensuring the sealing effect; after the detection is completed, the gas or liquid in the semi-annular sac 50 is released, and the accommodating chamber 52 is expanded again by the internal elastic member 55, thereby sucking the colloid into the accommodating chamber 52, and actively recovering the colloid without the need for the staff to manually recover the colloid, which is convenient to use.

[0058] The beneficial effect of the sealing detection device for the pipe flange interface provided by the embodiment of the present invention is as follows: compared with the prior art, the sealing detection device for the pipe flange interface provided by the embodiment of the present invention has an inner box and an outer box sealed in sequence on the outside of the pipe flange interface. During detection, the two inner half boxes 11 are first buckled onto the outside of the pipe flange interface and sealed with the pipe; then the two outer half boxes 12 are buckled onto the outside of the inner half box 11 and sealed with the pipe.

[0059] Then, colored gas / smoke is filled into the inner box through the pressurizing and maintaining component until the preset pressure is reached in the inner box and the pressure is maintained for a period of time; since the outer half box 12 is a transparent box, if the inner box is not sealed well, the colored gas / smoke will overflow from the inner box into the outer box and be observed.

[0060] If there is no colored gas / smoke overflowing from the inner box and the inner box pressure detected by the pressure detection assembly 20 is constant, it means that the pipeline flange interface is well sealed.

[0061] If there is no colored gas / smoke overflowing from the inner box and the inner box pressure detected by the pressure detection assembly 20 decreases, it means that the seal at the pipeline flange interface is unqualified.

[0062] That is, the sealing detection device for the pipeline flange interface provided by the embodiment of the present invention can visually observe whether the inner box is well sealed during detection, thereby effectively avoiding misjudgment caused by inner box sealing problems.

[0063] At the same time, the first sealing component and the second sealing component effectively improve the sealing performance, the convenience of disassembly and assembly, and the universality.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sealing detection device for a pipeline flange interface, characterized in that: It includes an inner box, an outer box, a pressurizing and pressure-maintaining component and a pressure detection component. The inner box is formed by two inner half boxes buckled together, and the inner box is suitable for being covered on the outside of the flange interface and sealingly cooperating with the pipeline; the outer box is formed by two transparent outer half boxes buckled together, and the outer box is suitable for being covered on the outside of the inner box and sealingly cooperating with the pipeline; the pressure detection component is connected to the inner half box to detect the pressure inside the inner box; the pressurizing and pressure-maintaining component is connected to the inner half box to fill the inner box with colored gas / smoke until the inner box reaches a preset pressure and maintains the pressure.

2. The sealing detection device for the pipeline flange interface according to claim 1 is characterized in that: The outer box is provided with colored layers on two adjacent inner wall surfaces in the radial direction of the pipeline, and the color of the colored layer is the opposite color to the color of the colored gas / smoke.

3. The sealing detection device for the pipeline flange interface according to claim 1 is characterized in that: It also includes four first sealing components, which are respectively arranged between the joint surfaces of the two inner half boxes and the two outer half boxes. The first sealing component includes a sealing strip. The joint surfaces of the two inner half boxes and the joint surfaces of the two outer half boxes are both provided with first sealing grooves, and the sealing strip is embedded in the first sealing groove.

4. The sealing detection device for the pipeline flange interface according to claim 3 is characterized in that: The sealing strip has telescopic capsules on both sides thereof, the telescopic capsules being connected to the sealing strip; the first sealing groove has a receiving groove on the side facing away from the joint surface; the telescopic capsules are suitable for being placed in the receiving groove and for filling the receiving groove by expanding.

5. The sealing detection device for the pipeline flange interface according to claim 4 is characterized in that: The first sealing assembly further comprises a sealing gasket which is sandwiched between the two inner half-boxes and between the two outer half-boxes.

6. The sealing detection device for the pipeline flange interface according to claim 5, characterized in that: The first sealing assembly also includes an elastic band, one side of the telescopic bag is connected to the sealing strip and is suitable for expanding toward the side facing away from the sealing strip, and the two ends of the elastic band in the width direction respectively bypass the tops of the two telescopic bags and are connected to the side of the telescopic bag facing away from the sealing strip.

7. The sealing detection device for pipeline flange interface according to claim 1, characterized in that: The pressurizing and pressure-maintaining component includes a valve, an air pump and a gas storage bottle. One end of the valve is connected to the interior of the inner box, and the other end is connected to the air pump. The air pump is connected to the gas storage bottle and is used to pump the colored gas / smoke in the gas storage bottle into the inner box.

8. The sealing detection device for pipeline flange interface according to claim 1, characterized in that: It also includes four second sealing components, which are respectively arranged at the two ends of the inner box and the outer box. The second sealing components include two semi-annular sacs, which are arranged between the inner half box or the outer half box and the pipeline. The two ends of the two semi-annular sacs are mutually clamped to form an annular sealing sac; the semi-annular sacs can be expanded and contracted in the radial and circumferential directions.

9. The sealing detection device for the pipeline flange interface according to claim 8, characterized in that: A second sealing groove is circumferentially provided on the inner surface of the semi-annular sac body, and a plurality of glue outlet holes are provided at the bottom of the second sealing groove. A diaphragm is axially provided inside the semi-annular sac body to divide the interior of the semi-annular sac body radially from inside to outside into a receiving chamber and a pressure chamber, and the receiving chamber is suitable for storing colloid.

10. The sealing detection device for pipeline flange interface according to claim 9, characterized in that: A plurality of elastic members are also arranged in the accommodating cavity. The elastic members are arranged in the accommodating cavity at intervals to provide radial supporting force.

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