Integrated leakage test vacuum cover

Abstract

The utility model relates to the technical field of leakage detection in nondestructive testing technology, in particular to an integrated leakage detection vacuum cover which comprises a timer, a pressure-adjustable vacuum meter, a T-shaped three-way valve, a vacuum cover shell and a lamp strip, the vacuum cover shell is a rectangular hollow shell with an opening in the bottom, and an observation opening is formed in the middle of the top end of the vacuum cover shell. The T-shaped three-way valve is horizontally installed on the first working face, a connecting port of the T-shaped three-way valve is communicated with an inner cavity of the vacuum cover shell, one end of the pressure-adjustable vacuum meter is connected to an extraction opening of the T-shaped three-way valve, an air inlet of the T-shaped three-way valve is communicated with the external environment, and the other end of the pressure-adjustable vacuum meter is communicated with the vacuum pump matched with the pressure-adjustable vacuum meter. The left side of the second working face is provided with a timer which is used for cyclically timing during leakage detection operation, and the back faces of the second working face and the third working face are respectively provided with a lamp strip which is used as an auxiliary light source for leakage detection.

Description

Technical Field

[0001] This utility model relates to the field of leak detection technology in non-destructive testing technology, and in particular to an integrated leak detection vacuum hood. Background Technology

[0002] The construction of nuclear power plants involves massive metal welding operations. Non-destructive testing (NDT) is a crucial part of the quality acceptance process for numerous steel structures, including spent fuel pools, fuel pools, and containment vessel steel linings, after welding. With over thirty years of development in my country's nuclear power industry, NDT equipment and methods have continuously improved. In today's rapidly developing economy, the stable and continuous power output of nuclear power units is highly valued by electricity consumers, leading to increasingly stringent requirements for construction progress and quality. Leakage testing is a vital technique for inspecting the quality of metal welding, and the vacuum chamber method is the preferred device for vacuum testing. Penetration defects in welding are among the most serious defects in nuclear power metal welding. Failure to detect these defects can lead to the leakage of radioactive liquids, severely impacting the operational safety of the nuclear power unit. Therefore, leakage testing in nuclear power units has clear acceptance standards and a rigorous document review mechanism.

[0003] However, the vacuum chamber used in existing leak detection technologies is cumbersome to operate. The auxiliary light source and vacuum pressure holding time are only confirmed indirectly. The auxiliary light source is refracted through a flashlight into the observation window onto the target weld for observation and defect assessment. The pressure holding time is timed and reminded by a dedicated assistant, and the vacuum pressure gauge requires multiple adjustments to maintain a fixed vacuum pressure, making it difficult to accurately achieve the required pressure value. Therefore, various factors can arise during the inspection process, such as operator fatigue, insensitive auxiliary light source illumination, and errors in information transmission from assistants, leading to leak detection failure and thus increasing the risk of leakage. Utility Model Content

[0004] The purpose of this invention is to provide an integrated leak detection vacuum hood to solve the technical problems existing in the background art.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] An integrated leak detection vacuum chamber includes: a timer, an adjustable pressure vacuum gauge, a T-type three-way valve, a vacuum chamber housing, and a light strip. The vacuum chamber housing is a rectangular hollow shell with an open bottom. An observation port is provided at the center of the top of the vacuum chamber housing. The front end, rear top end, and front top end of the vacuum chamber housing are respectively a first working surface, a second working surface, and a third working surface. The T-type three-way valve is horizontally mounted on the first working surface. The connection port of the T-type three-way valve is connected to the inner cavity of the vacuum chamber housing. One end of the adjustable pressure vacuum gauge is connected to the air extraction port of the T-type three-way valve, and the air inlet of the T-type three-way valve is connected to the external environment. The other end of the adjustable pressure vacuum gauge is connected to a matching vacuum pump. A timer for cyclic timing during leak detection is provided on the left side of the second working surface. Light strips serving as auxiliary light sources for leak detection are provided on the back of both the second and third working surfaces.

[0007] Furthermore, the observation port is made of rectangular acrylic material, and a rectangular hole is provided in the center of the top of the vacuum cover. The observation port is sealed and embedded in the inner wall of the rectangular hole.

[0008] Furthermore, the T-type three-way valve is a ball valve. When the valve stem of the T-type three-way valve is moved to be perpendicular to the vacuum chamber housing, the air inlet is closed, and at this time the air extraction port forms a passage with the inner cavity of the vacuum chamber housing; when the valve stem of the T-type three-way valve is moved to be parallel to the vacuum chamber housing, the air extraction port is closed, and the air inlet forms a passage with the inner cavity of the vacuum chamber housing.

[0009] Furthermore, one end of the adjustable pressure vacuum gauge is an 8mm pneumatic quick-connect interface, which is detachably connected to one end of a pipeline interface, and the other end of the pipeline interface is connected to the air extraction port of a T-type three-way valve.

[0010] Furthermore, the other end of the adjustable vacuum gauge is connected to one end of the air tube, and the other end of the air tube is provided with an 8mm C-type quick-connect male connector. The suction end of the vacuum pump is provided with an 8mm C-type quick-connect female connector, and the 8mm C-type quick-connect male connector is detachably plugged into and fixed to the 8mm C-type quick-connect female connector.

[0011] Furthermore, a battery compartment is provided on the left side of the third working surface, and a battery is detachably installed in the battery compartment. A light strip switch is provided on the right side of the third working surface, and the battery, light strip switch and light strip are electrically connected in a circuit.

[0012] Furthermore, the battery is an 18650 lithium battery; the length of the light strip is 235mm.

[0013] Furthermore, two handles are symmetrically arranged on the left and right sides of the top of the vacuum chamber housing.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] The integrated leak detection vacuum hood provided by this utility model reduces the number of openings in the vacuum hood shell, making the shell structure more stable. Only one opening is needed to achieve pressure extraction and air intake. The pressure can be determined by controlling the gas flow rate by rotating the adjustable vacuum gauge valve, greatly reducing the number of operation steps. Compared with existing vacuum hoods that require a dedicated person to time and remind the operator of the pressure holding time, the integrated vacuum hood allows the operator to directly time and observe, which is more intuitive and accurate, avoiding information transmission errors. The observation light source of the integrated leak detection vacuum hood is a primary light source illuminating the inside of the hood, which is consistent with the illuminance measured by the illuminance meter and the irradiation surface is uniform and stable, allowing for clearer and more direct observation of the weld quality. Due to the fewer openings and external parts, the integrated vacuum detection hood has a better appearance than existing leak detection hoods. The integrated leak detection hood design reduces the operation time required for steps such as checking with a flashlight, timing and inquiry, pressure adjustment, and operating multiple valves for vacuum hood extraction and air intake. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the planar structure of this utility model;

[0017] Figure 2 This is a three-dimensional structural schematic diagram of the present invention;

[0018] Figure 3 This is a schematic diagram of the testing operation of this utility model.

[0019] The labels in the attached diagram are as follows: 1-Timer, 2-Battery compartment, 3-Adjustable vacuum gauge, 4-T-type three-way valve, 5-LED strip switch, 6-Vacuum cover housing, 7-LED strip, 1-1-First working surface, 1-2-Second working surface, 1-3-Third working surface. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0021] See Figures 1-3As shown, an integrated leak detection vacuum chamber includes: a timer 1, an adjustable vacuum gauge 3, a T-type three-way valve 4, a vacuum chamber housing 6, and a light strip 7. The vacuum chamber housing 6 is a rectangular hollow shell with an open bottom. An observation port is provided at the center of the top of the vacuum chamber housing 6. The front end, rear top end, and front top end of the vacuum chamber housing 6 are respectively the first working surface 1-1, the second working surface 1-2, and the third working surface 1-3. The T-type three-way valve 4 is horizontally installed on the first working surface 1-1. The connection port of the T-type three-way valve 4 is connected to the inner cavity of the vacuum chamber housing 6. One end of the adjustable vacuum gauge 3 is connected to the air extraction port of the T-type three-way valve 4, and the air inlet of the T-type three-way valve 4 is connected to the external environment. The other end of the adjustable vacuum gauge 3 is connected to a matching vacuum pump. A timer 1 that performs cyclic timing during leak detection is provided on the left side of the second working surface 1-2. Light strips 7, which serve as auxiliary light sources for leak detection, are provided on the back of both the second working surface 1-2 and the third working surface 1-3.

[0022] In this embodiment, the observation port is made of rectangular acrylic material. A rectangular hole is provided in the middle of the top of the vacuum housing 6. The observation port is sealed and embedded in the inner wall of the rectangular hole. The observation port provides the function of direct detection and observation.

[0023] In this embodiment, the T-type three-way valve 4 is a ball valve. When the valve stem of the T-type three-way valve 4 is moved to be perpendicular to the vacuum chamber housing 6, the air inlet is closed. At this time, the air extraction port and the inner cavity of the vacuum chamber housing 6 form a passage, which is the gas extraction passage to start the leak inspection operation. When the valve stem of the T-type three-way valve 4 is moved to be parallel to the vacuum chamber housing 6, the air extraction port is closed, the air inlet and the inner cavity of the vacuum chamber housing 6 form a passage, and the vacuum chamber pressure is restored so that the vacuum chamber can be moved to continue the inspection.

[0024] In this embodiment, one end of the adjustable vacuum gauge 3 is an 8mm pneumatic quick-connect interface, which is detachably connected to one end of the pipeline interface. The other end of the pipeline interface is connected to the air extraction port of the T-type three-way valve 4. This facilitates quick disassembly, replacement, or storage of the adjustable vacuum gauge 3. The other end of the adjustable vacuum gauge 3 is connected to one end of the air pipe, which is equipped with an 8mm C-type quick-connect male connector. The air extraction end of the vacuum pump is equipped with an 8mm C-type quick-connect female connector, which is detachably plugged into and fixed to the 8mm C-type quick-connect female connector.

[0025] In this embodiment, a battery compartment 2 is provided on the left side of the third working surface 1-3, and a battery is detachably installed in the battery compartment 2. A light strip switch 5 is provided on the right side of the third working surface 1-3. The battery, the light strip switch 5 and the light strip 7 are electrically connected in a circuit. Turning on the light strip 7 provides an auxiliary light source that meets the illumination requirements for detection. To ensure voltage and lighting duration, two 18650 lithium batteries are installed in the battery compartment 2. The length of the light strip 7 is 235mm.

[0026] In this embodiment, two handles are symmetrically arranged on the left and right sides of the top of the vacuum chamber housing 6, which facilitates the movement of the entire device.

[0027] Working Principle: Based on the commissioned testing standards, determine the required pressure holding time, vacuum pressure, illuminance, and other specifications. Determine the basic parameters needed for the inspection. Install the adjustable vacuum gauge 3, T-type three-way valve 4, and vacuum chamber housing 6. Install the adjustable vacuum gauge 3 and vacuum pump. If the weld to be inspected is a planar butt weld, place the integrated leak inspection vacuum chamber parallel to the weld surface. Use the adjustable vacuum gauge 3 to adjust the vacuum pressure to the standard requirement. Once the pressure is constant, move the valve stem of the adjustable vacuum gauge 3 perpendicular to the vacuum chamber housing 6 to begin pressure extraction. Turn on the light strip 7 to test the illuminance of the light source. After meeting the illuminance requirements in the testing standards, start the timer 1 to set the standard-specified pressure holding time. When the adjustable vacuum gauge 3 displays that the vacuum chamber pressure has reached the standard requirement, start timing. Observe the weld quality during the operation.

[0028] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "top / bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent substitutions, and improvements made by those skilled in the art to the above embodiments without departing from the scope of the present utility model's technical solution and based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model's technical solution.

Claims

1. An integrated leak detection vacuum hood, characterized in that, include: The system includes a timer (1), an adjustable vacuum gauge (3), a T-type three-way valve (4), a vacuum housing (6), and a light strip (7). The vacuum housing (6) is a rectangular hollow housing with an open bottom. An observation port is provided at the center of the top of the vacuum housing (6). The front end, rear top end, and front top end of the vacuum housing (6) are respectively the first working surface (1-1), the second working surface (1-2), and the third working surface (1-3). The T-type three-way valve (4) is horizontally installed on the first working surface (1-1). The connection port is connected to the inner cavity of the vacuum chamber housing (6). One end of the adjustable pressure vacuum gauge (3) is connected to the air extraction port of the T-type three-way valve (4). The air inlet of the T-type three-way valve (4) is connected to the external environment. The other end of the adjustable pressure vacuum gauge (3) is connected to the matching vacuum pump. A timer (1) for cyclic timing during leak detection is provided on the left side of the second working surface (1-2). A light strip (7) as an auxiliary light source for leak detection is provided on the back of both the second working surface (1-2) and the third working surface (1-3).

2. The integrated leak detection vacuum chamber according to claim 1, characterized in that: The observation port is made of rectangular acrylic material, and a rectangular hole is provided at the center of the top of the vacuum housing (6). The observation port is sealed and embedded in the inner wall of the rectangular hole.

3. The integrated leak detection vacuum chamber according to claim 1, characterized in that: The T-type three-way valve (4) is a ball valve. When the valve stem of the T-type three-way valve (4) is moved to be perpendicular to the vacuum housing (6), the air inlet is closed. At this time, the air extraction port forms a passage with the inner cavity of the vacuum housing (6). When the valve stem of the T-type three-way valve (4) is moved to be parallel to the vacuum housing (6), the air extraction port is closed. The air inlet forms a passage with the inner cavity of the vacuum housing (6).

4. The integrated leak detection vacuum chamber according to claim 1, characterized in that: One end of the adjustable pressure vacuum gauge (3) is an 8mm pneumatic quick-connect interface, which is detachably connected to one end of a pipeline interface. The other end of the pipeline interface is connected to the air extraction port of the T-type three-way valve (4).

5. An integrated leak detection vacuum chamber according to claim 1, characterized in that: The other end of the adjustable vacuum gauge (3) is connected to one end of the air pipe. The other end of the air pipe is provided with an 8mmC quick-connect male connector. The pumping end of the vacuum pump is provided with an 8mmC quick-connect female connector. The 8mmC quick-connect male connector is detachably plugged into and fixed to the 8mmC quick-connect female connector.

6. An integrated leak detection vacuum chamber according to claim 1, characterized in that: A battery compartment (2) is provided on the left side of the third working surface (1-3), and a battery is detachably installed in the battery compartment (2). A light strip switch (5) is provided on the right side of the third working surface (1-3), and the battery, the light strip switch (5) and the light strip (7) are electrically connected in a circuit.

7. An integrated leak detection vacuum chamber according to claim 6, characterized in that: The battery is an 18650 lithium battery; the length of the light strip (7) is 235mm.

8. An integrated leak detection vacuum chamber according to claim 1, characterized in that: Two handles are symmetrically arranged on the left and right sides of the top of the vacuum chamber housing (6).

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