Leak detection device for ventilation pipe of nuclear power plant

Abstract

The utility model discloses a nuclear power plant vent pipe leak detection device which comprises a telescopic assembly, the telescopic assembly comprises a plurality of sections of telescopic rods, the outer diameter of the inner cavity of each section of telescopic rod is larger than that of the next section of telescopic rod, and every two adjacent telescopic rods are fixed through an adjusting structure; a leak detection storage barrel for storing leak detection liquid and a leak detection liquid injector connected with the leak detection storage barrel are arranged on the first section of telescopic rod, the leak detection liquid injector is connected with a liquid injection pipe, and one end, far away from the leak detection liquid injector, of the liquid injection pipe is fixed on the last section of telescopic rod; the leakage detection liquid injector can be used for spraying the leakage detection liquid to the air pipe joint from the nozzle of the liquid injection pipe, the unreachable problem can be well solved, the air leakage phenomenon of the air pipe can be found in time, hidden defects of the air pipe can be found in time under the condition that external risks are not introduced to safe operation of related equipment of a nuclear power plant, and the practical value is good.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power, in particular to a leak detection device for ventilation pipes in nuclear power plants. Background Art

[0002] Nuclear power plants have designed a variety of ventilation systems to ensure room habitability, operation of electrical equipment, radioactive gas emissions, etc. Among them, for radioactive gas emissions, the "Regulations on Environmental Radiation Protection for Nuclear Power Plants (GB6249)" and the "Basic Standards for Ionizing Radiation Protection and Radiation Source Safety (GB18871-2002)" require continuous monitoring when radioactive substances are discharged into the environment. Therefore, before passing through the monitoring device, no radioactive gas should leak into the atmospheric environment through the ventilation duct.

[0003] When the ventilation pipes in existing nuclear power plants are designed and installed, they are all composed of small sections of air ducts spliced by bolts, which leads to air leakage at the joints of the air ducts due to poor sealing. And due to reasons such as plant layout, some air ducts are inaccessible to personnel, that is, it is impossible to directly check for air leakage by means such as spraying leak detection liquid, which may result in defects not being discovered and eliminated in time. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a leak detection device for ventilation pipes in nuclear power plants.

[0005] The technical solution adopted by the utility model to solve its technical problem is: to construct a leak detection device for ventilation pipes in nuclear power plants, including a telescopic assembly. The telescopic assembly includes multiple telescopic rods. The inner cavity of each telescopic rod is larger than the outer diameter of the next telescopic rod. Adjacent telescopic rods are fixed by an adjustment structure; a leak detection storage bucket for storing leak detection liquid is provided on the first telescopic rod, and a leak detection liquid syringe connected to the leak detection storage bucket. The leak detection liquid syringe is connected with a liquid injection pipe, and the end of the liquid injection pipe far away from the leak detection liquid syringe is fixed on the last telescopic rod.

[0006] In some embodiments, the adjustment structure includes a locking cap. The locking cap is sleeved axially movably at the joint of adjacent telescopic rods, and a locking chuck is arranged inside the locking cap.

[0007] In some embodiments, a fixing frame is installed on each telescopic rod;

[0008] The liquid injection pipe is connected with the fixing frame.

[0009] In some embodiments, the fixing frame is detachably connected with the telescopic rod.

[0010] In some embodiments, each of the fixing frames includes a first half-ring body and a second half-ring body for sleeving on the telescopic rod. First connecting ears are respectively provided at two ends of the first half-ring body, and second connecting ears are respectively provided at two ends of the second half-ring body. The first connecting ears and the second connecting ears are connected by a first fastener;

[0011] A columnar part is provided on the first half-ring body and / or the second half-ring body, and a limiting hole for the liquid injection pipe to pass through is provided on the columnar part.

[0012] In some embodiments, a check valve is provided at one end of the inner cavity of the leak detection liquid syringe close to the liquid outlet.

[0013] In some embodiments, the number of the telescopic rods is at least four.

[0014] In some embodiments, the telescopic rod is a metal rod.

[0015] In some embodiments, the leak detection storage barrel is connected to the first telescopic rod through a connection assembly.

[0016] In some embodiments, the connection assembly includes a third half-ring body and a fourth half-ring body for sleeving on the telescopic rod. Third connecting ears are respectively provided at two ends of the third half-ring body, and fourth connecting ears are respectively provided at two ends of the fourth half-ring body. The third connecting ears and the fourth connecting ears are connected by a second fastener;

[0017] The leak detection storage barrel is fixedly connected to the third half-ring body or the fourth half-ring body.

[0018] Implementing the present utility model has the following beneficial effects: The nuclear power plant ventilation pipe leak detection device includes a telescopic assembly. The telescopic assembly includes multiple telescopic rods. The inner cavity of each telescopic rod is larger than the outer diameter of the next telescopic rod, and adjacent telescopic rods are fixed through an adjusting structure. A leak detection storage barrel for storing leak detection liquid and a leak detection liquid syringe connected to the leak detection storage barrel are provided on the first telescopic rod. The leak detection liquid syringe is connected with a liquid injection pipe, and one end of the liquid injection pipe far away from the leak detection liquid syringe is fixed on the last telescopic rod. The leak detection liquid can be sprayed from the nozzle of the liquid injection pipe to the wind pipe connection by using the leak detection liquid syringe, which can well solve the problem of inaccessibility, timely detect the air leakage phenomenon of the wind pipe, and is conducive to timely detecting the hidden defects of the wind pipe without introducing external risks to the safe operation of the relevant equipment in the nuclear power plant, and has good practical value. Description of the Drawings

[0019] To more clearly illustrate the technical solution of the present utility model, the following will further explain the present utility model in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings. In the drawings:

[0020] Figure 1 is a schematic structural view of the leak detection device for nuclear power plant ventilation pipes in a contracted state in some embodiments of the present utility model;

[0021] Figure 2 is a schematic structural view of the leak detection device for nuclear power plant ventilation pipes in an extended state in some embodiments of the present utility model;

[0022] Figure 3 is a cross-sectional view of the telescopic assembly in a contracted state in some embodiments of the present utility model;

[0023] Figure 4 is a cross-sectional view of the leak detection device for nuclear power plant ventilation pipes in an extended state in some embodiments of the present utility model;

[0024] Figure 5 is Figure 4 an enlarged view of the adjustment structure within the circle in

[0025] Figure 6 is a partial schematic structural view of the leak detection device for nuclear power plant ventilation pipes in some embodiments of the present utility model;

[0026] Figure 7 is a schematic structural view of the locking cap in some embodiments of the present utility model;

[0027] Figure 8 is a schematic structural view of the locking jaw in some embodiments of the present utility model;

[0028] Figure 9 is a schematic structural view of the fixing bracket in some embodiments of the present utility model. Detailed implementation manners

[0029] For a clearer understanding of the technical features, objectives, and effects of the present utility model, the specific embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientation or positional relationships indicated by terms such as "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are based on the orientation or positional relationships shown in the drawings and are constructed and operated in a specific orientation. This is only for the convenience of describing the technical solution and does not indicate that the indicated devices or elements must have a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0030] It should also be noted that, unless otherwise clearly defined and limited, terms such as "installation", "connection", "attachment", "fixation", "setting" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. When an element is referred to as being "above" or "below" another element, the element can be "directly" or "indirectly" located above the other element, or there may also be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the technical solution and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] In the following description, for the purpose of illustration rather than limitation, specific details such as specific system structures and technologies are presented to provide a thorough understanding of the embodiments of the present utility model. However, those skilled in the art should clearly understand that the present utility model can also be implemented in other embodiments without these specific details. In other cases, the detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present utility model.

[0032] Refer to Figures 1 to 9, the present utility model shows a leak detection device for ventilation pipes in a nuclear power plant, which includes a telescopic assembly 10. The telescopic assembly 10 includes multiple telescopic rods 11. The telescopic rods 11 can be in a round rod structure. The inner cavity of each telescopic rod 11 is larger than the outer diameter of the next telescopic rod 11. Two adjacent telescopic rods 11 are fixed through an adjustment structure 20 to adjust the overall length of the telescopic assembly 10. When the telescopic assembly 10 is in a fully extended state, the length dimension is between 2 meters and 5 meters. When the telescopic assembly 10 is in a fully extended state, the length dimension is between 1 meter and 2 meters. Of course, the telescopic length of the telescopic assembly 10 can be adjusted according to requirements, and no specific limitation is made here.

[0033] Further, a leak detection storage barrel 30 for storing leak detection liquid is provided on the first telescopic rod 11, and a leak detection liquid syringe 40 connected to the leak detection storage barrel 30. Here, the first telescopic rod 11 can be the telescopic rod 11 with the largest outer diameter or diameter dimension.

[0034] The leak detection liquid syringe 40 is connected with a liquid injection pipe 50. One end of the liquid injection pipe 50 away from the leak detection liquid syringe 40 is fixed on the last telescopic rod 11 to send the leak detection liquid to the air duct connection. Using the leak detection liquid syringe 40 to spray the leak detection liquid from the nozzle of the liquid injection pipe 50 onto the air duct connection can well solve the problem of inaccessibility, timely detect the air duct air leakage phenomenon, and is conducive to timely detecting hidden defects of the air duct without introducing external risks to the safe operation of relevant equipment in the nuclear power plant, having good practical value.

[0035] Refer to Figure 3 、 Figure 4 、 Figure 7 、 Figure 8, in some embodiments, the adjusting structure 20 includes a locking cap 21 which is axially movably sleeved on the connection part of two adjacent telescopic rods 11. A locking segment 22 is arranged inside the locking cap 21. The locking cap 21 can be generally cylindrical, and an internal thread can be provided on the inner wall surface of the locking cap 21. An external thread can be provided on the outer circumference of the telescopic rod 11 with a larger outer diameter among two adjacent telescopic rods 11. The external thread cooperates with the internal thread, so that the locking cap 21 can be installed on the telescopic rod 11 and can be adjusted along the axial direction of the telescopic rod 11. A first inclined surface is provided on the inner side of the end wall of the locking cap 21. The number of the locking segments 22 can be two. The shape of each locking segment 22 is generally arc-shaped. A second inclined surface is provided on some parts of each locking segment 22 facing the end wall of the locking cap 21. When the locking cap 21 axially presses the locking segment 22, the first inclined surface and the second inclined surface press against each other, so that the locking segment 22 locks the telescopic rod 11 with a smaller outer diameter in the radial direction. Of course, in some embodiments, the locking segment 22 can be made of a silicone rubber ring or a rubber ring. When the locking cap 21 axially presses the locking segment 22, the locking segment 22 deforms and radially presses the locking cap 21 and the telescopic rod 11 with a smaller outer diameter, so that the two telescopic rods 11 are relatively fixed.

[0036] Of course, in some embodiments, the adjusting structure 20 can also adopt a snap-locking structure, which is not specifically limited here.

[0037] Refer to Figure 4 and Figure 9 , in some embodiments, a fixing bracket 60 is installed on each telescopic rod 11. The liquid injection pipe 50 is connected to the fixing bracket 60, which can improve the connection stability of the liquid injection pipe 50. The liquid injection pipe 50 can include but is not limited to a silicone hose. The liquid injection pipe 50 can be connected to the liquid outlet of the leak detection liquid syringe 40 through a quick connector.

[0038] In some embodiments, the fixing bracket 60 is detachably connected to the telescopic rod 11. Further, each fixing bracket 60 includes a first semi-ring body 61 and a second semi-ring body 62 for sleeving on the telescopic rod 11. First connecting ears 611 are respectively arranged at both ends of the first semi-ring body 61, and second connecting ears 621 are respectively arranged at both ends of the second semi-ring body 62. The first connecting ears 611 and the second connecting ears 621 are connected by a first fastener. The first fastener includes but is not limited to bolts or screws.

[0039] A columnar part 63 is provided on the first semi-ring body 61 and / or the second semi-ring body 62, and a limiting hole 631 for the liquid injection pipe 50 to pass through is provided on the columnar part 63.

[0040] Refer to Figure 4, in some embodiments, a check valve 41 is provided at one end of the inner cavity of the leak detection liquid syringe 40 near the liquid outlet to prevent the reverse flow of the leak detection liquid.

[0041] Preferably, the number of the telescopic rods 11 is at least four. The telescopic rods 11 can be solid tubes or hollow tubes, and the telescopic rods 11 can be metal rods, such as stainless steel tubes, aluminum alloy tubes, etc.

[0042] For another example Figure 6 As shown, in some embodiments, the leak detection storage barrel 30 is connected to the first telescopic rod 11 through a connection assembly 70.

[0043] Wherein, the connection assembly 70 includes a third half-ring body 71 and a fourth half-ring body 72 for sleeving on the telescopic rod 11. Third connection ears 711 are respectively provided at both ends of the third half-ring body 71, and fourth connection ears 721 are respectively provided at both ends of the fourth half-ring body 72. The third connection ears 711 and the fourth connection ears 721 are connected by a second fastener, and the second fastener includes but is not limited to bolts or screws. The leak detection storage barrel 30 is fixedly connected to the third half-ring body 71 or the fourth half-ring body 72.

[0044] It can be understood that the above embodiments only represent the preferred embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be construed as a limitation on the scope of the patent of the present invention; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present invention; therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. A leak detection device for a ventilation pipe in a nuclear power plant, characterized in that, It includes a telescopic component (10), and the telescopic component (10) includes multiple sections of telescopic rods (11). The inner cavity of each section of the telescopic rod (11) is larger than the outer diameter of the next section of the telescopic rod (11). Adjacent two telescopic rods (11) are fixed by an adjustment structure (20); a leak detection storage barrel (30) for storing leak detection liquid is provided on the first section of the telescopic rod (11), and a leak detection liquid syringe (40) connected to the leak detection storage barrel (30). The leak detection liquid syringe (40) is connected with a liquid injection pipe (50), and one end of the liquid injection pipe (50) far away from the leak detection liquid syringe (40) is fixed on the last section of the telescopic rod (11).

2. The leak detection device for the ventilation pipe of a nuclear power plant according to claim 1, characterized in that, The adjustment structure (20) includes a locking cap (21). The locking cap (21) is sleeved on the connection part of adjacent two telescopic rods (11) and can move axially. A locking segment (22) is arranged in the locking cap (21).

3. The leak detection device for the ventilation pipe of a nuclear power plant according to claim 2, wherein A fixing frame (60) is installed on each telescopic rod (11); The liquid injection pipe (50) is connected with the fixing frame (60).

4. The leak detection device for the ventilation pipe of a nuclear power plant according to claim 3, characterized in that, The fixing frame (60) is detachably connected with the telescopic rod (11).

5. The leak detection device for the ventilation pipe of a nuclear power plant according to claim 4, wherein, Each fixing frame (60) includes a first half-ring body (61) and a second half-ring body (62) for sleeving on the telescopic rod (11). First connecting ears (611) are respectively arranged at two ends of the first half-ring body (61), and second connecting ears (621) are respectively arranged at two ends of the second half-ring body (62). The first connecting ears (611) and the second connecting ears (621) are connected by a first fastener; A columnar part (63) is arranged on the first half-ring body (61) and / or the second half-ring body (62). A limiting hole (631) for the liquid injection pipe (50) to pass through is arranged on the columnar part (63).

6. The leak detection device for the ventilation pipe of a nuclear power plant according to claim 1, characterized in that, A check valve (41) is arranged at one end of the inner cavity of the leak detection liquid syringe (40) close to the liquid outlet.

7. The leak detection device for the ventilation pipe of a nuclear power plant according to claim 1, characterized in that, The number of the telescopic rods (11) is at least four.

8. The leak detection device for the ventilation pipe of a nuclear power plant according to claim 1, characterized in that, The telescopic rod (11) is a metal rod.

9. The leak detection device for the ventilation pipe of a nuclear power plant according to claim 1, wherein, The leak detection storage barrel (30) is connected with the first section of the telescopic rod (11) through a connection component (70).

10. The leak detection device for the ventilation pipe of a nuclear power plant according to claim 9, characterized in that, The connection component (70) includes a third half-ring body (71) and a fourth half-ring body (72) for sleeving on the telescopic rod (11). Third connecting ears (711) are respectively arranged at two ends of the third half-ring body (71), and fourth connecting ears (721) are respectively arranged at two ends of the fourth half-ring body (72). The third connecting ears (711) and the fourth connecting ears (721) are connected by a second fastener; The leak detection storage barrel (30) is fixedly connected with the third half-ring body (71) or the fourth half-ring body (72).

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