Vacuum suction hood for gas leak detection

Abstract

The utility model provides a kind of vacuum adsorption cover for gas leakage detection, it includes cover body (10) and sealing element (30). Cover body (10) includes main body (11) and vent connector (13). Main body (11) is cylindrical. The end of main body (11) along its axial is cover mouth end (112). Main body (11) is open in cover mouth end (112) to form cover mouth (114). Vent connector (13) is connected main body (11) and communicates the inner chamber of main body (11). Vent connector (13) is used to with the vacuumizing connector of detection instrument butt joint. Sealing element (30) is set to cover mouth end (112) to form sealing between cover mouth end (112) and the surface of the body to be detected. The utility model is used for the vacuum adsorption cover for gas leakage detection to improve the sensitivity of local gas leakage detection.

Description

Technical Field

[0001] This utility model relates to a device for gas leak detection, and more particularly to a vacuum adsorption hood for gas leak detection. Background Technology

[0002] For gas-insulated switchgear, gas leak detection is a crucial means to ensure the safe operation of equipment and the health of personnel. The accuracy and sensitivity of gas leak detection are particularly critical. However, existing gas leak detection methods have low sensitivity when dealing with localized, minute leaks, making them insufficient to meet detection requirements. Utility Model Content

[0003] The purpose of this invention is to provide a vacuum adsorption hood for gas leak detection, which helps to improve the sensitivity of local gas leak detection.

[0004] This invention provides a vacuum adsorption hood for gas leak detection, comprising a hood body and a sealing element. The hood body includes a main body and a vent connector. The main body is cylindrical. One end of the main body along its axial direction is the hood opening end. The main body is open at the hood opening end to form a hood opening. The vent connector connects to the main body and communicates with the inner cavity of the main body. The vent connector is used to mate with the vacuum connector of the detection instrument. The sealing element is disposed at the hood opening end to form a seal between the hood opening end and the surface of the object being tested.

[0005] The vacuum adsorption hood for gas leak detection of this invention can form a negative pressure collection zone in the test area on the surface of the object being tested, which can efficiently enrich the leaked gas and continuously guide it to the detection instrument, thereby improving the sensitivity of local gas leak detection.

[0006] In another illustrative embodiment of the vacuum adsorption hood for gas leak detection, the seal is made of an elastic material and is suction cup shaped. The seal includes a sleeve and a sealing skirt. The sleeve is annular and fits tightly and radially outward at the hood opening. The sealing skirt connects to the sleeve and is used to seal tightly against the surface of the object being tested. This allows the vacuum adsorption hood to adhere more effectively to the surface of the object being tested during use.

[0007] In another illustrative embodiment of the vacuum adsorption hood used for gas leak detection, a limiting protrusion is formed on the outer peripheral surface of the hood opening. A mating groove is formed on the inner surface of the sleeve portion to engage with the limiting protrusion. This facilitates improved stability of the connection between the hood and the seal.

[0008] In another illustrative embodiment of the vacuum adsorption hood for gas leak detection, both the limiting protrusion and the mating groove are annular, extending circumferentially along the body, thereby facilitating processing and assembly.

[0009] In another illustrative embodiment of the vacuum adsorption hood for gas leak detection, the vacuum adsorption hood further includes a retaining sleeve. At least a portion of the retaining sleeve is fitted radially outward of the sleeve portion and opposite to the limiting protrusion along the radial direction of the body, to fix the sleeve portion to the hood opening end. This facilitates further improvement in the stability of the connection between the hood body and the seal.

[0010] In another illustrative embodiment of the vacuum adsorption hood for gas leak detection, a boss is further formed on the outer peripheral surface of the hood opening. The platform of the boss is located on the side of the limiting protrusion away from the hood opening along the axial direction of the main body and faces away from the limiting protrusion. The fixing sleeve includes a collar and a positioning ring. The collar is fitted radially outward of the sleeve portion. The positioning ring connects to the axial end of the collar and overlaps the platform of the boss. The vacuum adsorption hood also includes a fastener. The fastener connects to the main body and can press the positioning ring against the platform of the boss to fix the relative position of the fixing sleeve and the main body. This facilitates the fixing of the fixing sleeve.

[0011] In another illustrative embodiment of the vacuum adsorption hood used for gas leak detection, a fastener is fitted onto the main body and threadedly connected to it, so that the axial force generated by the threaded pair presses the positioning ring against the platform of the boss. This structure is simple and has good stability.

[0012] In another illustrative embodiment of the vacuum adsorption hood for gas leak detection, the vacuum adsorption hood further includes a clamp. The clamp is fitted radially outward of the sleeve portion to secure the sleeve portion to the hood opening end. This facilitates improved stability of the connection between the hood body and the seal.

[0013] In another illustrative embodiment of the vacuum adsorption hood for gas leak detection, an annular mounting groove is recessed at the end face of the hood opening. A sealing ring, which is disposed within the mounting groove, forms a seal between the groove surface and the surface of the object being tested. This structure is simple and low in cost.

[0014] In another illustrative embodiment of the vacuum adsorption hood for gas leak detection, the vent connector includes a neck tube and an orifice flange. The neck tube is cylindrical. One end of the neck tube is connected to the main body and communicates with the inner cavity of the main body. The orifice flange is coaxially connected to the other end of the neck tube. The orifice flange is configured to mate with the vacuum connector of the detection instrument to form a KF connector. This facilitates improved airtightness after the vent connector and the vacuum connector of the detection instrument are connected. Attached Figure Description

[0015] The following figures are for illustrative purposes only and do not limit the scope of the present invention.

[0016] Figure 1 This is a schematic diagram of one embodiment of a vacuum adsorption hood used for gas leak detection.

[0017] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the vacuum adsorption hood.

[0018] Figure 3 for Figure 1 The diagram shows the state after the vacuum adsorption hood is connected to the vacuum connector of the testing instrument.

[0019] Figure 4 for Figure 2 Enlarged schematic diagram of section IV.

[0020] Figure 5 This is a schematic diagram of another embodiment of a vacuum adsorption hood used for gas leak detection.

[0021] Figure 6 This is a schematic diagram of another embodiment of a vacuum adsorption hood for gas leak detection.

[0022] Figure 7 for Figure 6 The diagram shows a cross-sectional view of the vacuum adsorption hood.

[0023] Label Explanation

[0024] 10. Cover

[0025] 11 Main Body

[0026] 112 Mask opening end

[0027] 1121 Limiting protrusion

[0028] 1122 convex platform

[0029] F countertop

[0030] 1123 Mounting Slot

[0031] 114 Mask opening

[0032] 13 Vent connector

[0033] 131 Cervical canal

[0034] 132 orifice flange

[0035] 30 Seals

[0036] 31 Socket

[0037] 311 Mating Groove

[0038] 32 Sealed skirt

[0039] 50 Fixing sleeve

[0040] 51 rings

[0041] 52 Positioning Ring

[0042] 70 Fasteners

[0043] 80 clamps

[0044] 90 tested subjects

[0045] 100 Vacuum Adsorption Cover

[0046] Vacuum connector for 200 testing instruments

[0047] X Axis of the main body

[0048] θ is the circumferential direction of the main body. Detailed Implementation

[0049] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, specific embodiments of the present utility model are now described with reference to the accompanying drawings. In the drawings, the same reference numerals indicate components with the same or similar structures but the same function.

[0050] In this document, “illustrative” means “serving as an example, illustration or description”, and any illustration or implementation described herein as “illustrative” should not be construed as a more preferred or advantageous technical solution.

[0051] To keep the drawings simple, each drawing only schematically shows the parts related to this utility model, and they do not represent the actual structure of the product.

[0052] Figure 1 This is a schematic diagram of one embodiment of a vacuum adsorption hood used for gas leak detection. Figure 2 for Figure 1 The diagram shows a cross-sectional view of the vacuum adsorption hood. Figure 1 and Figure 2 As shown, the vacuum adsorption hood 100 for gas leak detection includes a hood body 10 and a seal 30. The hood body 10 includes a main body 11 and a vent 13. The main body 11 is cylindrical. One end of the main body 11 along its axial direction X (i.e., Figure 1 and Figure 2 The lower end of the body 11 is the hood opening end 112. The body 11 is open at the hood opening end 112 to form the hood opening 114. The vent connector 13 connects to the other end of the body 11 along the axial direction X (i.e., Figure 1 and Figure 2 The upper end of the connector 13 is connected to the inner cavity of the main body 11. The vent connector 13 is used to connect with the vacuum connector of the testing instrument. Figure 3The diagram schematically illustrates the state after the vacuum adsorption hood 100 is connected to the vacuum connector 200 of the detection instrument. The detection instrument, for example, can evacuate the vacuum adsorption hood 100 through its vacuum connector 200 and detect the gas drawn into the vacuum connector 200, but is not limited to this. Figure 2 As shown, a seal 30 is disposed at the cover opening end 112 to form a seal between the cover opening end 112 and the outer surface of the object under test 90. The object under test 90 is, for example, a sealed container, and more specifically, may be the gas box of a gas-insulated switchgear. Figure 2 The image only shows part of the container wall and the components installed on the container wall. The lower side of the container wall is the cavity of the sealed container.

[0053] When using it, you can follow these steps:

[0054] a) Fill the cavity of the object being tested 90 with helium gas;

[0055] b) Connect the vent connector 13 to the vacuum connector of the helium mass spectrometer leak detector;

[0056] c) Cover the test area on the outer surface of the test body 90 with the cover end 112 of the main body 11 and press it so that a seal is formed between the cover end 112 and the outer surface of the test body 90 through the sealing member 30.

[0057] d) Start the leak detection process of the helium mass spectrometer. The helium mass spectrometer will automatically start to draw a vacuum and press the vacuum adsorption hood 100 tightly onto the outer surface of the object being tested 90. After that, no further pressure needs to be applied.

[0058] If there are minute leaks on the outer surface of the tested object 90, they can be detected by a helium mass spectrometer leak detector. Of course, other gases can also be introduced into the tested object 90 and detected by other types of detectors; this is not limited to this method.

[0059] The enclosure 10 here is made of metal or other rigid materials to ensure the reliability of vacuuming.

[0060] The vacuum adsorption hood of this illustrative embodiment can form a negative pressure collection area on the test area of ​​the outer surface of the object being tested, which can efficiently enrich the leaked gas and continuously guide it to the detection instrument, thereby improving the sensitivity of local gas leak detection.

[0061] Figure 4 for Figure 2 Enlarged schematic diagram of section IV. Specifically, as shown... Figure 4As shown, in this illustrative embodiment, the seal 30 is made of an elastic material and is suction cup shaped. The seal 30 includes a sleeve portion 31 and a sealing skirt 32. The sleeve portion 31 is annular and fits sealingly onto the radially outer side of the cover opening end 112. The sealing skirt 32 connects to the sleeve portion 31 and is used to sealably adhere to the surface of the object being tested 90. Therefore, during use, the vacuum suction cover can be better adsorbed onto the surface of the object being tested 90.

[0062] like Figure 4 As shown in the illustrative embodiment, a limiting protrusion 1121 protrudes from the outer peripheral surface of the cover end 112. A mating groove 311 is formed on the inner surface of the sleeve portion 31 to engage with the limiting protrusion 1121. This facilitates improved stability of the connection between the cover body 10 and the seal 30. In this illustrative embodiment, both the limiting protrusion 1121 and the mating groove 311 are annular, extending along the circumferential direction θ of the body 11, which facilitates processing and assembly, but is not limited to this. In other illustrative embodiments, the limiting protrusion 1121 and the mating groove 311 may also be arranged in multiple arrays at intervals along the circumferential direction θ of the body 11. Figure 1 The circumferential direction θ is shown in the figure.

[0063] like Figure 4 As shown in the schematic embodiment, the vacuum adsorption hood 100 further includes a fixing sleeve 50. The fixing sleeve 50 includes a collar 51. The collar 51 is fitted radially outward of the sleeve portion 31 and is radially opposite to the limiting protrusion 1121 of the body 11 to fix the sleeve portion 31 to the hood opening end 112. This facilitates further improvement in the stability of the connection between the hood body 10 and the sealing member 30.

[0064] like Figure 4 As shown, in the schematic embodiment, the outer peripheral surface of the cover opening 112 is further formed with an annular boss 1122 extending along the circumferential direction θ of the body 11. The platform F of the boss 1122 is located on the side of the limiting protrusion 1121 away from the cover opening 114 along the axial direction X of the body 11 and faces away from the limiting protrusion 1121 (i.e., Figure 4 (The platform surface F faces upward). In this illustrative embodiment, the limiting protrusion 1121 protrudes from the outer peripheral surface of the boss 1122, but is not limited thereto. The fixing sleeve 50 also includes a positioning ring 52. The positioning ring 52 connects to the axial end of the collar 51 and overlaps the platform surface F of the boss 1122. The vacuum suction cover 100 also includes a fastener 70. The fastener 70 connects to the body 11 and can press the positioning ring 52 against the platform surface F of the boss 1122 to fix the relative position of the fixing sleeve 50 and the body 11. This facilitates the fixing of the fixing sleeve 50.

[0065] Specifically, in this illustrative embodiment, the fastener 70 is sleeved on the body 11 and threadedly connected to the body 11, so that the locating ring 52 is pressed against the platform F of the boss 1122 by the axial force generated by the threaded pair. This structure is simple and has good stability, but it is not limited to this. The outer peripheral surface of the fastener 70 is, for example, a prism surface to facilitate operation, but it is not limited to this.

[0066] like Figure 5 As shown, in other illustrative embodiments, it is also possible to... Figure 1 Based on the vacuum adsorption hood 100 shown, the structure of the fixing sleeve 50, fastener 70 and boss 1122 is removed, and the sleeve 31 is fixed to the hood opening end 112 by adding a clamp 80 that is sleeved on the radially outer side of the sleeve 31. This helps to reduce costs.

[0067] like Figure 1 and Figure 2 As shown, in the illustrative embodiment, the vent connector 13 includes a neck tube 131 and an orifice flange 132. The neck tube 131 is cylindrical. One end of the neck tube 131 is connected to the body 11 and communicates with the inner cavity of the body 11. The orifice flange 132 is coaxially connected to the other end of the neck tube 131. The orifice flange 132 is configured to mate with the vacuum connector 200 of the testing instrument to form a KF connector (see...). Figure 3 This improves the airtightness of the vent connector 13 after it is connected to the vacuum connector of the testing instrument. It is understood that the KF (Klein Flange) connector can be any type of connector in the existing technology; it is a standardized connector in the field of vacuum technology, and its core function is to achieve rapid connection of vacuum pipelines through a mechanical seal assembly.

[0068] Figure 6 This is a schematic diagram of another embodiment of a vacuum adsorption hood for gas leak detection. Figure 7 for Figure 6 The diagram shows a cross-sectional view of the vacuum adsorption hood. Figure 6 and Figure 7 As shown, the vacuum adsorption hood 100 for gas leak detection includes a hood body 10 and a seal 30. The hood body 10 includes a main body 11 and a vent 13. The main body 11 is cylindrical. One end of the main body 11 along its axial direction X (i.e., Figure 6 and Figure 7 The lower end of the body 11 is the hood opening end 112. The body 11 is open at the hood opening end 112 to form the hood opening 114. The vent connector 13 connects to the other end of the body 11 along the axial direction X (i.e., Figure 6 and Figure 7The upper end of the body 11 is connected to the inner cavity of the main body 11. The vent connector 13 is used to connect with the vacuum connector of the detection instrument. The detection instrument, for example, can evacuate the vacuum adsorption hood 100 through its vacuum connector and detect the gas drawn in by the vacuum connector; the detection instrument is, for example, a helium mass spectrometer leak detector, but is not limited thereto. A sealing element 30 is provided at the hood opening end 112 to form a seal between the hood opening end 112 and the outer surface of the object being tested 90. Specifically, in this illustrative embodiment, as... Figure 7 As shown, the end face of the cover opening 112 is recessed with an annular mounting groove 1123 surrounding the cover opening 114. The sealing element 30 is a sealing ring and is disposed in the mounting groove 1123. The sealing ring can form a seal between the groove surface of the mounting groove 1123 and the surface of the object being tested 90. This structure is simple and has low cost.

[0069] The method of using the vacuum adsorption hood in this illustrative embodiment is similar to... Figure 1 The vacuum adsorption hood shown is the same and will not be described again here. With the vacuum adsorption hood of this illustrative embodiment, a negative pressure collection zone can be formed on the test area of ​​the outer surface of the object being tested, which can efficiently concentrate leaked gas and continuously guide it to the detection instrument, thereby improving the sensitivity of local gas leak detection.

[0070] In the illustrative embodiment, the diameters of the body 11 and the cover 114, as well as the height of the body 11 along the axial direction X, can be set, for example, according to the size of the area to be measured on the surface of the object being tested 90 and / or the components mounted on the area to be measured. Figure 1 and Figure 6 The main body 11 and the opening 114 of the vacuum adsorption hood 100 are of different sizes.

[0071] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0072] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. All equivalent implementation schemes or modifications made without departing from the spirit of the present utility model, such as combinations, divisions or repetitions of features, should be included within the scope of protection of the present utility model.

Claims

1. A vacuum adsorption hood for gas leak detection, characterized in that, include: The cover (10) includes: The main body (11) is cylindrical, with one end of the main body (11) along its axial direction (X) being a cover end (112). The main body (11) is open at the cover end (112) to form a cover opening (114). A vent connector (13) is connected to the main body (11) and communicates with the inner cavity of the main body (11). The vent connector (13) is used to mate with the vacuum connector of the testing instrument. A sealing element (30) is disposed at the opening end (112) to form a seal between the opening end (112) and the surface of the object being tested.

2. The vacuum adsorption hood for gas leak detection as described in claim 1, characterized in that, The seal (30) is made of an elastic material and is in the shape of a suction cup. The seal (30) includes: A sleeve (31), which is annular and sealingly fitted onto the radially outer side of the cover end (112); and A sealing skirt (32) is connected to the sleeve (31) and is used to seal against the surface of the object being tested.

3. The vacuum adsorption hood for gas leak detection as described in claim 2, characterized in that, The outer peripheral surface of the cover end (112) protrudes to form a limiting protrusion (1121), and the inner surface of the sleeve part (31) is formed with a mating groove (311) that fits into the limiting protrusion (1121).

4. The vacuum adsorption hood for gas leak detection as described in claim 3, characterized in that, Both the limiting protrusion (1121) and the mating groove (311) are annular, extending circumferentially (θ) along the body (11).

5. The vacuum adsorption hood for gas leak detection as described in claim 3, characterized in that, The vacuum adsorption hood also includes a fixing sleeve (50), at least a portion of which is sleeved on the radially outer side of the sleeve portion (31) and opposite to the limiting protrusion (1121) along the radial direction of the body (11) to fix the sleeve portion (31) to the hood opening end (112).

6. The vacuum adsorption hood for gas leak detection as described in claim 5, characterized in that, The outer peripheral surface of the cover opening end (112) is also formed with a boss (1122). The platform (F) of the boss (1122) is located on the side of the limiting protrusion (1121) away from the cover opening (114) along the axial direction (X) of the main body (11) and facing away from the limiting protrusion (1121). The fixing sleeve (50) includes a collar (51) and a positioning ring (52). The collar (51) is sleeved on the sleeve part (31). The positioning ring (52) is connected to the axial end of the collar (51) and overlaps the platform (F) of the boss (1122) on the radial outer side. The vacuum adsorption cover also includes a fastener (70), which is connected to the body (11) and can press the positioning ring (52) against the platform (F) of the boss (1122) to fix the relative position of the fixing sleeve (50) and the body (11).

7. The vacuum adsorption hood for gas leak detection as described in claim 6, characterized in that, The fastener (70) is fitted onto the body (11) and threadedly connected to the body (11) so as to press the positioning ring (52) against the platform (F) of the boss (1122) by means of the axial force generated by the threaded pair.

8. The vacuum adsorption hood for gas leak detection as described in claim 2, characterized in that, The vacuum adsorption hood also includes a clamp (80), which is sleeved on the radially outer side of the sleeve (31) to fix the sleeve (31) to the hood opening end (112).

9. The vacuum adsorption hood for gas leak detection as described in claim 1, characterized in that, The end face of the cover opening (112) is recessed with an annular mounting groove (1123) surrounding the cover opening (114). The sealing element (30) is a sealing ring and is disposed in the mounting groove (1123). The sealing ring can form a seal between the groove surface of the mounting groove (1123) and the surface of the object being tested.

10. The vacuum adsorption hood for gas leak detection as described in any one of claims 1-9, characterized in that, The vent connector (13) includes: A neck tube (131), which is cylindrical, one end of which is connected to the body (11) and communicates with the inner cavity of the body (11); and An orifice flange (132) is coaxially connected to the other end of the neck tube (131), and the orifice flange (132) is configured to mate with the vacuum connector of the testing instrument to form a KF connector.

Images