Nuclear power plant breather valve sealing test device

Abstract

The utility model discloses a nuclear power plant breather valve sealing performance test device comprising a pressurizing cover used for being connected with a valve body of a nuclear power plant breather valve and used for covering an upper cavity of the valve body, and a fixing assembly used for connecting and fixing the valve body and the pressurizing cover, and the pressurizing cover is provided with a connector used for being connected with pressurizing equipment; the connecting pipe is connected with the air inlet of the valve body, and the bubble counter is connected with the connecting pipe. By applying the device, the pressure difference can be established to simulate the opening state of the breather valve of the nuclear power plant in a manner of reversely applying positive pressure from the outlet of the valve cavity of the breather valve of the nuclear power plant. Long-term operation of machines and equipment is not needed, noise cannot be brought during verification work, and on-site valve state judgment cannot be affected. Positive pressure is reversely applied to the air outlet, leaked gas can be directly collected at the air inlet, the air bubble counter is used for directly, accurately and quantitatively detecting the sealing performance of the breather valve of the nuclear power plant, and the problem that the leakage rate cannot be visually collected and calculated in the negative pressure pumping test is solved.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power technology, and in particular to a test device for the sealing performance of a breather valve in a nuclear power plant. Background Technology

[0002] Breather valves are crucial negative pressure protection devices in systems, widely used in containers, tanks, and pipelines in power, chemical, and petroleum industries to prevent equipment damage due to negative pressure. There have been numerous reports of tanks deforming and being damaged under negative pressure in nuclear power plants and the petroleum and chemical industries. According to relevant safety regulations for pressure relief devices, breather valves must be calibrated periodically. Current breather valve calibration devices all use negative pressure to calibrate the valve, but their effectiveness in actual use is unsatisfactory. Practical verification has shown that they have the following drawbacks:

[0003] 1) In actual use, the equipment has limited vacuuming capacity. If a larger vacuum level is to be achieved, a large vacuum pump and buffer tank are required, which takes up a lot of space and is costly.

[0004] 2) Vacuum is not easy to maintain, so the vacuum pump needs to run for a long time during the actual verification process, which causes a lot of noise on site, making it impossible to accurately monitor the sound when the valve is actually opened, thus affecting the actual verification results.

[0005] 3) It is inconvenient to verify the sealing performance of the breather valve because the system is under negative pressure. When there is a leak, the system will be drawn in, and the commonly used bubble leak detection method cannot be used, making it inconvenient to accurately monitor the actual sealing performance of the breather valve. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a test device for the sealing performance of a nuclear power plant's breather valve.

[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: a nuclear power plant breather valve sealing test device is constructed, including a pressurization hood for connecting to the valve body of the nuclear power plant breather valve and covering the upper chamber of the valve body, and a fixing assembly for connecting and fixing the valve body and the pressurization hood. The pressurization hood is provided with a connector for connecting a pressurization device. The nuclear power plant breather valve sealing test device also includes a connecting pipe connected to the air inlet of the valve body, and a bubble counter connected to the connecting pipe.

[0008] In some embodiments, the pressurization shroud includes a cylindrical body with an open end having a mounting flange for connection to the flange of the valve body via the fixing assembly.

[0009] In some embodiments, the number of the fixing assemblies is multiple, each of the fixing assemblies comprises a clamping body and a fastening screw, the clamping body is in a U-shaped structure, the clamping body comprises a main body part, two ends of the main body part extend with a first positioning part and a second positioning part respectively, the first positioning part is used for abutting against a lower surface of a flange of the valve body, the second positioning part is located above the mounting flange, the second positioning part is provided with a threaded hole penetrating through upper and lower surfaces thereof, the fastening screw is arranged in the threaded hole, and a lower end surface of the fastening screw is provided with a limiting part used for abutting against an upper surface of the mounting flange.

[0010] In some embodiments, an upper end of the fastening screw is provided with a limiting hole, the fixing assembly further comprises an operating rod arranged in the limiting hole, and axial two ends of the operating rod are respectively provided with anti-disengagement parts.

[0011] In some embodiments, the number of the fixing assemblies is three or four.

[0012] In some embodiments, the lower surface of the mounting flange is further provided with an annular groove, and a sealing ring is arranged in the annular groove.

[0013] In some embodiments, the circular cylindrical body further comprises a top wall and a circumferential surrounding wall extending from the top wall, the mounting flange is connected with the circumferential surrounding wall, the connector is arranged at a central position of the top wall, and the connector is arranged in communication with an inner cavity of the circular cylindrical body.

[0014] In some embodiments, the connector comprises a quick connector.

[0015] In some embodiments, the pressure charging cover is an integral structure.

[0016] In some embodiments, the pressure charging cover is a metal piece.

[0017] The utility model discloses a nuclear power plant breather valve sealing property test device, can establish the pressure difference from the outlet of the valve cavity of the nuclear power plant breather valve Reverse positive pressure mode simulation nuclear power plant breather valve opening state. Compared with the negative pressure, air is more easily compressed, and can provide great pressure and gas supply capacity, does not need machine and equipment long -term operation, does not bring noise when checking work, does not affect the scene valve state judgment. Through the reverse positive pressure at the gas outlet, the gas leakage can be directly collected at the air inlet, and then the sealing property of the nuclear power plant breather valve is directly and accurately quantitatively detected through the bubble counter, so that the problem that the leakage rate cannot be directly collected and calculated during the negative pressure test is solved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the utility model, the utility model will be further described below in conjunction with the drawings and embodiments, it should be understood that the following drawings only show some embodiments of the utility model, therefore should not be regarded as limiting the scope, for the ordinary skilled person in the art, under the premise of not paying creative labor, still can obtain other related drawings according to these drawings. In the drawings,

[0019] Figure 1 It is the principle schematic diagram of breathing valve;

[0020] Figure 2 It is the structure schematic diagram of nuclear power plant breathing valve sealing test device in some embodiments of the utility model;

[0021] Figure 3 It is the structure schematic diagram of fixed assembly in some embodiments of the utility model. DETAILED DESCRIPTION

[0022] In order to have more clear understanding of the technical features, object and effect of the utility model, the specific implementation mode of the utility model will be described in detail by comparing with the drawings. In the following description, it should be understood that the orientation or position relationship indicated by "front", "rear", "upper", "lower", "left", "right", "vertical", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail" and the like is the orientation or position relationship shown in the drawings, constructed and operated in a particular orientation, and is only for the convenience of describing the technical scheme, and should not be understood as indicating that the indicated device or element must have a particular orientation, therefore should not be understood as limiting the utility model.

[0023] It should be further explained that, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated, can be mechanically connected, or can be electrically connected, can be directly connected, or can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements. When an element is referred to as "on" or "under" another element, the element can be "directly" or "indirectly" located on another element, or there can be one or more intermediate elements. The terms "first", "second", "third" and the like are only for the convenience of describing the technical scheme, and should not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features, therefore, the features limited by "first", "second", "third" and the like can explicitly or implicitly include one or more features. For the ordinary skilled person in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0024] In the following description, for the purpose of explaining rather than limiting, specific details are set forth such as particular architectures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, persons having ordinary skill in the art will readily understand that the application can be practiced without such specific details. In other instances, well-known structures, devices, circuits, and techniques have been not described in detail or shown in diagram in order not to obscure the application.

[0025] Referring to Figure 1 Taking the CVI system breathing valve of a nuclear power plant as an example, the valve is opened and closed by the up-down action of the valve disc. The action principle is analyzed as follows: the force analysis of the valve disc shows that the main forces acting on the valve disc are the spring force Fs (upward), the weight of the valve disc and the force generated by the pressure difference between the atmospheric pressure and the vacuum pressure (downward). When the valve is not in action, the spring force is greater than the force generated by the weight of the valve disc (G) and the pressure difference (△P), and the valve disc is attached to the valve seat. At this time, the areas of the force generated by the atmospheric pressure and the force generated by the vacuum pressure are consistent, both being the circular plane (S) surrounded by the sealing surface. That is, Fs > △P*S+G. When the vacuum pressure in the system decreases, the pressure difference △P becomes larger, and when the force (as well as the weight of the valve disc) generated by the pressure difference △P is greater than the spring force, the valve is opened, realizing the protection function of the breathing valve.

[0026] As can be seen from the above action principle, the fundamental driving force of the breathing valve is the pressure difference △P, so it is only necessary to establish such a pressure difference to realize the action of the breathing valve, thereby verifying the performance of the breathing valve. Therefore, if the valve cavity of the breathing valve is placed in an atmospheric environment, the pressure difference can be established by increasing the pressure in the upper region of the valve disc, and the action and verification of the breathing valve can also be realized. For this purpose, the present application provides a nuclear power plant breathing valve sealing test device.

[0027] Referring to Figure 2 and Figure 3 As shown in the figures, the present application shows a nuclear power plant breathing valve sealing test device, which can include a pressure charging cover 10 for connecting with the valve body 100 of the nuclear power plant breathing valve for covering the upper cavity of the valve body 100, and a fixing assembly 20 for connecting and fixing the valve body 100 and the pressure charging cover 10. The pressure charging cover 10 is provided with a connector 13 for connecting a pressure charging device, which can be, but is not limited to, an air compressor. The pressure charging device can be connected with the connector 13 through a pressure lead pipe, and the pressure lead pipe can also be provided with a pressure gauge, a pressure reducing valve, etc. Alternatively, the pressure charging device can be a safety valve test bench, which is not specifically limited here.

[0028] The nuclear power plant breathing valve sealing test device further comprises a connecting pipe 30 connected with the air inlet 102 of the valve body 100, and a bubble counter 40 connected with the connecting pipe 30. The bubble counter 40 can be a bubble counting cup, and a leak detection liquid can be arranged in the bubble counting cup. It should be explained that the air inlet 102 of the valve body 100 at this time serves as an air outlet interface. In addition, the lower chamber of the valve body 100 is placed in an atmospheric environment.

[0029] In some embodiments, the pressurized cover 10 comprises a circular cylindrical body 11, and an installation flange 12 is arranged at the open end of the circular cylindrical body 11. The installation flange 12 is used to be connected with the flange 101 of the valve body 100 through the fixing assembly 20.

[0030] As shown in Figure 2 and Figure 3 , the number of the fixing assembly 20 is multiple, and each fixing assembly 20 comprises a clamping body 21 and a fastening screw 22. The clamping body 21 has a U-shaped structure, and comprises a main body part 211. The two ends of the main body part 211 respectively extend a first positioning part 212 and a second positioning part 213. The first positioning part 212 is used to abut against the lower surface of the flange 101 of the valve body 100, and the second positioning part 213 is located above the installation flange 12. The second positioning part 213 is provided with a threaded hole 2131 penetrating through the upper and lower surfaces thereof. The fastening screw 22 is arranged in the threaded hole 2131, and the lower end surface of the fastening screw 22 is provided with a limiting part 221 used to abut against the upper surface of the installation flange 12.

[0031] In some embodiments, the upper end of the fastening screw 22 is provided with a limiting hole 222, which can be a relative side surface penetrating through the circumferential direction of the fastening screw 22. The fixing assembly 20 further comprises an operating rod 23 arranged in the limiting hole 222. The two ends of the operating rod 23 in the axial direction are respectively provided with anti-dropping parts 231. The axial direction of the operating rod 23 and the axial direction of the fastening screw 22 are perpendicular to each other.

[0032] Wherein, the operating rod 23 can be operated by the worker, so that the fastening screw 22 can be moved in the height direction, thereby clamping the flange 101 and the installation flange 12. The fixing assembly 20 has a relatively simple structure, safe and reliable operation, and high applicability.

[0033] In some embodiments, the number of the fixing assemblies 20 is three or four, preferably, the number of the fixing assemblies 20 can be three, and the three fixing assemblies 20 can be uniformly distributed around the axis of the pressurizing cover 10. Alternatively, the number of the fixing assemblies 20 can be four, and the four fixing assemblies 20 can be uniformly distributed around the axis of the pressurizing cover 10. Of course, the number of the fixing assemblies 20 can also be four, five or other numbers, which can be selected according to actual needs, and here is not limited.

[0034] In some embodiments, the lower surface of the mounting flange 12 is further provided with an annular groove, and a sealing ring is arranged in the annular groove, so that the sealing performance of the pressurizing cover 10 is better when the mounting flange 12 and the flange 101 are fastened to each other. The sealing ring includes but is not limited to a silica gel ring or a rubber ring.

[0035] In some embodiments, the circular cylindrical body 11 further includes a top wall 111 and a circumferential surrounding wall 112 extending from the top wall 111, the mounting flange 12 is connected with the circumferential surrounding wall 112, the joint 13 is arranged at the center position of the top wall 111, and the joint 13 is arranged in communication with the inner cavity of the circular cylindrical body 11. The joint 13 can be coaxially arranged with the circular cylindrical body 11.

[0036] In some embodiments, the joint 13 includes a quick joint to realize quick connection.

[0037] In some embodiments, the pressurizing cover 10 is a one-piece structure.

[0038] In some embodiments, the pressurizing cover 10 is a metal piece, which can be made of stainless steel or aluminum alloy, and of course can also be made of other metal materials or non-metal materials, and here is not limited.

[0039] By using the nuclear power plant breather valve sealing test device, the pressure difference can be simulated by establishing a positive pressure in the reverse direction at the outlet of the valve cavity of the nuclear power plant breather valve, which is in the state of opening. Compared with negative pressure, air is easier to compress and can provide a large pressure and air supply capacity. The machine and equipment do not need to run for a long time, and will not bring noise during the calibration work and affect the judgment of the valve state on site.

[0040] By establishing a positive pressure in the reverse direction at the outlet, the leaked gas can be directly collected at the inlet 102, and then the sealing performance of the nuclear power plant breather valve can be directly and accurately quantitatively detected by using a leak detection liquid or a bubble counter 40, thereby solving the problem that the leakage rate cannot be directly collected and calculated during the negative pressure test.

[0041] In addition, the existing safety valve test bench can implement the calibration scheme, and there is no need to additionally design or purchase a special test bench, which can save costs and improve the utilization rate of the equipment.

[0042] It can be understood that the above embodiments only express the preferred embodiments of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the present application patent; it should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, the above technical features can be freely combined, and some deformations and improvements can be made, which belong to the protection scope of the present application; therefore, any equivalent transformation and modification within the scope of the claims of the present application shall belong to the scope of the claims of the present application.

Claims

1. A nuclear power plant respiratory valve tightness test device characterized by, The nuclear power plant breathing valve sealing test device comprises a pressurizing cover (10) for connecting with a valve body of a nuclear power plant breathing valve to cover an upper chamber of the valve body, and a fixing assembly (20) for connecting and fixing the valve body and the pressurizing cover (10), and the pressurizing cover (10) is provided with a connector (13) for connecting a pressurizing device; the nuclear power plant breathing valve sealing test device further comprises a connecting pipe (30) connected with an air inlet of the valve body, and a bubble counter (40) connected with the connecting pipe (30).

2. The nuclear power plant respiratory valve tightness testing device according to claim 1, characterized by The pressurizing cover (10) comprises a circular cylindrical main body (11), and an installation flange (12) is arranged at an open end of the circular cylindrical main body (11), and the installation flange (12) is used for being connected with a flange of the valve body through the fixing assembly (20).

3. The nuclear power plant respiratory valve tightness testing device according to claim 2, characterized in that, The fixing assembly (20) comprises a plurality of clamping bodies (21) and fastening screws (22), each clamping body (21) is in a U-shaped structure, and the clamping body (21) comprises a main body part (211), and first and second positioning parts (212) and (213) are respectively arranged at two ends of the main body part (211), the first positioning part (212) is used for abutting against a lower surface of the flange of the valve body, the second positioning part (213) is arranged above the installation flange (12), the second positioning part (213) is provided with a threaded hole penetrating through upper and lower surfaces thereof, the fastening screw (22) is arranged in the threaded hole, and a limiting part (221) for abutting against an upper surface of the installation flange (12) is arranged at a lower end surface of the fastening screw (22).

4. The nuclear power plant respiratory valve tightness testing device according to claim 3, characterized by An operating rod (23) is arranged in a limiting hole arranged at an upper end of the fastening screw (22), and anti-disengagement parts (231) are arranged at two axial ends of the operating rod (23).

5. The nuclear power plant respiratory valve tightness testing device according to claim 3, characterized by The number of the fixing assembly (20) is three or four.

6. The nuclear power plant respiratory valve tightness testing device according to claim 2, characterized by The lower surface of the installation flange is further provided with an annular groove, and a sealing ring is arranged in the annular groove.

7. The nuclear power plant respiratory valve tightness testing device according to claim 2, characterized by The circular cylindrical main body (11) further comprises a top wall (111) and a circumferential surrounding wall (112) extending from the top wall (111), the installation flange (12) is connected with the circumferential surrounding wall (112), the connector (13) is arranged at a central position of the top wall (111), and the connector (13) is arranged in communication with an inner cavity of the circular cylindrical main body (11).

8. The nuclear power plant respiratory valve tightness testing device according to claim 6, characterized by The connector (13) comprises a quick connector.

9. The nuclear power plant respiratory valve tightness testing device according to claim 1, characterized by The pressurizing cover (10) is in an integrated structure.

10. The nuclear power plant respiratory valve tightness testing device according to claim 1, characterized by The pressurizing cover (10) is a metal piece.

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