Gas leak detection tool

Abstract

The utility model provides a gas leak detection tool, which is characterized in that a test hole communicated with a gas cavity is formed in the middle of the end face, far away from a cover cap, of a cover body, and a leak detection groove is formed in the middle of a leak detection base, so that a workpiece can be conveniently placed between the cover body and the leak detection base; an arc-surface fixing protrusion is arranged in the middle of the end face, away from the cover body, of the cover cap, and a fixing recess matched with the arc-surface fixing protrusion is formed in a fixing piece connected with the corner air cylinder, so that a closed environment is formed in the testing cover by driving the fixing piece through the rotating air cylinder, and the leak hunting accuracy is guaranteed. The rocker is fixed on the side wall of the cover cap, so that the cover body and the central shaft can be conveniently driven to rotate through the rocker, and continuous leakage detection in the rotating process is realized; the gas detection port communicated with the leak detection groove is arranged on the side wall of the leak detection base, so that the gas tightness test result can be obtained conveniently.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical processing technical field especially relates to a gas leak detection tool. BACKGROUND

[0002] In the superhigh voltage transmission line, if suddenly being physically disconnected, high voltage arc will be produced on both sides of switch, and strong arc will not only melt the both ends contact of the disconnecting switch, but also easily break through the air to cause high voltage current to continue to flow through the air, at this time, the sulfur hexafluoride circuit breaker can effectively avoid this situation.

[0003] The transmission shaft of the sulfur hexafluoride circuit breaker needs to ensure that the sealing property is good in the rotating transmission process and the static process, however, the conventional leak detection mode is difficult to meet the continuous helium leak detection in the rotating process. UTILITY MODEL CONTENTS

[0004] In view of the problem that the conventional leak detection mode is difficult to meet the continuous helium leak detection in the rotating process in the prior art, the utility model provides a gas leak detection tool.

[0005] The utility model relates to a gas leak detection tool for testing the air tightness of a workpiece, which comprises a mounting seat, a leak detection unit and a fixing unit, the leak detection unit comprises a leak detection base, a test cover and a rocker, the leak detection base is fixed on the mounting seat, a leak detection groove is arranged in the middle of the leak detection base, a gas detection port is arranged on the side wall of the leak detection base, the gas detection port is communicated with the leak detection groove, the test cover comprises a cover body and a cover cap, the cover cap is fixed on the cover body, a circular arc surface fixing protrusion is arranged in the middle of the end face of the cover cap away from the cover body, the rocker is fixed on the side wall of the cover cap, a gas cavity is arranged in the middle of the cover body, a gas injection port and a vacuum air outlet are arranged on the side wall of the cover body, the gas injection port and the vacuum air outlet are both communicated with the gas cavity, a gas pressure gauge is further arranged on the side wall of the cover body, a test hole is arranged in the middle of the end face of the cover body away from the cover cap, and the test hole is communicated with the gas cavity; the fixing unit comprises a fixing support seat, a rotary angle cylinder and a fixing piece, the fixing support seat is fixed on the mounting seat, the rotary angle cylinder is fixed on the fixing support seat, the fixing piece is drivingly connected with the rotary angle cylinder, and a fixing recess is arranged on the fixing piece at a position corresponding to the circular arc surface fixing protrusion; the leak detection groove is used for placing a workpiece, the workpiece comprises a central shaft and a shell, the central shaft is rotatably arranged in the shell, and one end of the central shaft away from the leak detection groove extends out of the shell; when the tool is in a working state, the one end of the central shaft away from the leak detection groove is inserted into the test hole and tightly abuts against the inner side wall of the test hole, the rotary angle cylinder drives the fixing piece to tightly match the fixing recess with the circular arc surface fixing protrusion, the end face of the cover body away from the cover cap tightly abuts against the shell, and the shell tightly abuts against the groove bottom surface of the leak detection groove.

[0006] Preferably, the leak detection groove comprises a supporting portion and a leak detection portion, the supporting portion and the leak detection portion are communicated, the supporting portion is located at a side of the leak detection portion away from the mounting base, the cross-sectional area of the supporting portion is greater than that of the leak detection portion, the shell is tightly fitted with the groove bottom surface of the supporting portion, and the gas detection port is communicated with the leak detection portion.

[0007] Preferably, the side wall of the fixed support base is provided with a fixed groove near the leak detection base, the side of the leak detection base near the fixed support base is located in the fixed groove, the end surface of the leak detection base away from the mounting base is provided with a leak detection fixing hole corresponding to the fixed groove, the end surface of the fixed support base away from the mounting base is provided with a fixed connection hole corresponding to the leak detection fixing hole, and the fixed connection hole and the leak detection fixing hole are connected through a connecting piece.

[0008] Preferably, the end surface of the cover near the cover body is provided with a second sealing groove at a position outside the periphery of the gas cavity, and the second sealing groove is provided with a second sealing ring.

[0009] Preferably, the end surface of the cover body away from the cover is provided with a third sealing groove at a position outside the periphery of the test hole, and the third sealing groove is provided with a third sealing ring.

[0010] Preferably, the side wall of the cover is provided with a threaded fixing hole, the end of the rocker near the cover is provided with an external thread, and the threaded fixing hole and the external thread are matched with each other.

[0011] Preferably, the testing tool further comprises a test gas detector connected with the gas detection port.

[0012] Compared with the prior art, the gas leak detection tool of the utility model, through setting the test hole communicated with the gas cavity in the middle of the end surface of the cover body away from the cover, setting the leak detection groove in the middle of the leak detection base, the workpiece is placed between the cover body and the leak detection base; through setting the arc surface fixed convex on the middle of the end surface of the cover away from the cover body, setting the fixed concave matched with the arc surface fixed convex on the fixed piece connected with the rotary cylinder, the test cover inside is formed into airtight environment by driving the fixed piece through the rotary cylinder, the accuracy of leak detection is ensured; through fixing the rocker on the side wall of the cover, the cover body and the central shaft are driven to rotate through the rocker, continuous leak detection during rotation is realized; through setting the gas detection port communicated with the leak detection groove on the side wall of the leak detection base, the gas tightness test result is obtained. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0014] Figure 1 It is a structure schematic view of a gas leak detection tool of an embodiment of the present application.

[0015] Figure 2 It is a rear view structure schematic view of a gas leak detection tool of an embodiment of the present application.

[0016] Figure 3 It is a top view structure schematic view of a gas leak detection tool of an embodiment of the present application.

[0017] Figure 4 It is Figure 3 The sectional view along the AA direction.

[0018] Figure 5 It is Figure 3 The sectional view along the BB direction.

[0019] Figure 6 It is Figure 3 The sectional view along the CC direction. Specific embodiments

[0020] In order to further understand the purpose, structure, characteristics and functions of the present application, the following will be described in detail in conjunction with the embodiments.

[0021] In the description of the present application, it should be pointed out that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the device or element indicated or implied to have a specific orientation, structure and operation, and therefore cannot be understood as limiting the present application.

[0022] Please refer to Figures 1 to 6 The present application relates to a gas leak detection tool, which is used for testing the air tightness of a workpiece 100. The tool comprises a mounting seat 10, a leak detection unit 20 and a fixing unit 30.

[0023] The leak detection unit 20 comprises a leak detection base 21, a test cover 22 and a rocker 23, the leak detection base 21 is fixed on the mounting base 10, a leak detection groove 211 is arranged in the middle of the leak detection base 21, and a gas detection port 212 is arranged on the side wall of the leak detection base 21 and communicates with the leak detection groove 211.

[0024] The test cover 22 comprises a cover body 221 and a cover cap 222, the cover cap 222 is fixed on the cover body 221, a circular arc surface fixing protrusion 2221 is arranged in the middle of the end face of the cover cap 222 away from the cover body 221, the rocker 23 is fixed on the side wall of the cover cap 222, a gas cavity 2211 is arranged in the middle of the cover body 221, a gas injection port 2212 and a vacuum air outlet 2213 are arranged on the side wall of the cover body 221 and communicate with the gas cavity 2211, the gas injection port 2212 is used for injecting test gas into the gas cavity 2211, the vacuum air outlet 2213 is used for evacuating the original gas in the gas cavity 2211, a gas pressure gauge 2214 is further arranged on the side wall of the cover body 221, the gas pressure gauge 2214 is used for observing the gas pressure value in the gas cavity 2211, a test hole 2215 is arranged in the middle of the end face of the cover body 221 away from the cover cap 222, and the test hole 2215 communicates with the gas cavity 2211.

[0025] The fixing unit 30 comprises a fixing support base 31, a corner cylinder 32 and a fixing piece 33, the fixing support base 31 is fixed on the mounting base 10, the corner cylinder 32 is fixed on the fixing support base 31, and the fixing piece 33 is in driving connection with the corner cylinder 32, and a fixing recess 331 is arranged on the fixing piece 33 at a position corresponding to the circular arc surface fixing protrusion 2221.

[0026] The workpiece 100 is placed in the leak detection groove 211, and the workpiece 100 comprises a central shaft 11 and a shell 12, the central shaft 11 is movably arranged in the shell 12, and an end of the central shaft 11 away from the leak detection groove 211 extends out of the shell 12.

[0027] When the gauge is in a working state, the end of the central shaft 11 away from the leak detection groove 211 is inserted into the test hole 2215 and tightly abuts against the inner side wall of the test hole 2215, the corner cylinder 32 drives the fixing piece 33 to tightly match the fixing recess 331 with the circular arc surface fixing protrusion 2221, the end face of the cover body 21 away from the cover cap 22 tightly abuts against the shell 12, and the shell 12 tightly abuts against the groove bottom surface of the leak detection groove 211.

[0028] The gas leak detection tool of the embodiment is characterized in that a test hole 2215 is arranged in the middle of the end surface of the cover body 221 away from the cover 222 and is in communication with the gas cavity 2211, a leak detection groove 211 is arranged in the middle of the leak detection base 21, and the workpiece 100 is placed between the cover body 221 and the leak detection base 21; an arc surface fixing protrusion 2221 is arranged in the middle of the end surface of the cover 222 away from the cover body 221, a fixing recess 331 matched with the arc surface fixing protrusion 2221 is arranged on the fixing member 33 connected with the rotary cylinder 32, the inside of the test cover 22 is formed into a closed environment by driving the fixing member 33 through the rotary cylinder 32, and the accuracy of the leak detection is ensured; the rocker 23 is fixed on the side wall of the cover 222, the cover body 221 and the central shaft 11 are driven to rotate through the rocker 23, and the leak detection is continuously performed during the rotation; and the gas detection port 212 in communication with the leak detection groove 211 is arranged on the side wall of the leak detection base 21, and the gas tightness test result is obtained.

[0029] In a preferred embodiment, referring to Figure 3 、 Figure 4 and Figure 5 , the leak detection groove 211 comprises a support portion 2111 and a leak detection portion 2112, the support portion 2111 and the leak detection portion 2112 are in communication, the support portion 2111 is located on the side of the leak detection portion 2112 away from the mounting base 10, the cross-sectional area of the support portion 2111 is greater than that of the leak detection portion 2112, the shell 12 is tightly attached to the groove bottom surface of the support portion 2111, and the gas detection port 212 is in communication with the leak detection portion 2112, so as to ensure the sealing between the workpiece 100 and the leak detection groove 211, and the gas tightness result of the workpiece 100 is accurately obtained through the gas detection port 212.

[0030] In order to ensure the accuracy of the test result, the first sealing groove 2113 is arranged on the position of the groove bottom surface of the support portion 2111 corresponding to the shell 12, and the first sealing ring is arranged in the first sealing groove 2113.

[0031] In a preferred embodiment, referring to Figure 4 , the side wall of the fixing support base 31 is provided with a fixing recess 311 close to the leak detection base 21, the side of the leak detection base 21 close to the fixing support base 31 is located in the fixing recess 311, the leak detection fixing hole 212 is arranged on the end surface of the leak detection base 21 away from the mounting base 10 and corresponding to the fixing recess 311, the fixing connecting hole 312 is arranged on the end surface of the fixing support base 31 away from the mounting base 10 and corresponding to the leak detection fixing hole 212, and the fixing connecting hole 312 and the leak detection fixing hole 212 are connected through the connecting member, so that the structure of the tool is more compact and the volume is smaller.

[0032] In order to ensure the stability of the structure of the testing tool, the end face of the leak detection base 21 away from the mounting base 10 is attached to the groove wall of the fixed groove 311.

[0033] In order to prevent the connection from hindering other structures and the use of the testing tool, the fixed connection hole 312 includes a first part 3121 and a second part 3122, the first part 3121 and the second part 3122 are communicated, the first part 3121 is located on the side of the second part 3122 away from the mounting base 10, and the inner diameter of the first part 3121 is greater than that of the second part 3122.

[0034] In order to ensure the sealing of the gas cavity 2211, the cover 222 is provided with a second sealing groove 2222 on the end face of the cover body 221 near the position outside the periphery of the gas cavity 2211, and a second sealing ring is arranged in the second sealing groove 2222.

[0035] In order to ensure the sealing between the test hole 2215 and the workpiece 100, the cover body 221 is provided with a third sealing groove 2216 on the end face away from the cover 222 and located outside the periphery of the test hole 2215, and a third sealing ring is arranged in the third sealing groove 2216.

[0036] In order to facilitate the disassembly of the rocker 23, thereby facilitating the storage of the testing tool, please refer to Figure 5 , the sidewall of the cover 222 is provided with a threaded fixing hole 2223, and the end of the rocker 23 near the cover 222 is provided with an external thread, and the threaded fixing hole 2223 and the external thread are matched with each other.

[0037] In order to accurately detect whether the gas detection port 212 has gas flowing out, thereby accurately obtaining the air tightness result of the workpiece 100, the testing tool further includes a test gas detector (not shown in the figure), and the test gas detector is connected with the gas detection port 212. When the test gas detector does not detect the test gas, it indicates that the air tightness of the workpiece 100 is good.

[0038] Use process: please refer to Figure 1 and Figure 4Firstly, the workpiece 100 is placed in the leakage detection groove 211, the workpiece 100 is, for example, a sulfur hexafluoride circuit breaker transmission shaft, the test cover 22 is covered on the central shaft 11 of the workpiece 100, the central shaft 11 of the workpiece 100 is inserted into the test hole 2215 and tightly fitted with the inner side wall of the test hole 2215 away from the end of the leakage detection groove 211; Then, the pneumatic switch is opened, the rotary air cylinder 32 rotates, the fixed part 33 is driven to make the fixed recess 331 tightly cooperate with the arc surface fixed protrusion 2221, the end surface of the cover body 21 away from the cover 22 is tightly fitted with the shell 12 of the workpiece 100, the shell 12 is tightly fitted with the groove bottom surface of the supporting part 2111, at this time, the closed environment is formed in the test cover 22; Next, the original gas (for example, air) in the gas cavity 2211 is pumped out through the vacuum air outlet 2213, and the test gas (for example, helium) is injected into the gas cavity 2211 through the gas injection port 2212, the gas pressure value is observed through the gas pressure gauge 2214, and the aeration is stopped when the target value (for example, 0.35MPa) is reached; Finally, the cover body 21 and the central shaft 11 are rotated by manually rotating the rocker 23, and the gas outflow of the gas detection port 212 is monitored by using the test gas detector at the same time, if the gas detection port 212 has no gas outflow, the workpiece 100 has good airtightness.

[0039] In actual use, the test gas can be helium, and the test gas detector can be a helium mass spectrometer; the central shaft 11 and the test hole 221 can be other shapes except the column and spline shape, as long as they cooperate with each other; the shape of the supporting part 2111 can be consistent with the contour shape of the shell 12, so that the shell 12 can be embedded in the supporting part 2111.

[0040] The utility model discloses a kind of gas leakage detection tools, test hole is set in the middle part of the end surface of cover body away from cover, which is communicated with gas cavity, leakage detection groove is set in the middle part of leakage detection base, workpiece is placed between cover body and leakage detection base;Arc surface fixed protrusion is set in the middle part of the end surface of cover away from cover body, fixed recess is set on the fixed part connected with rotary air cylinder, which cooperates with arc surface fixed protrusion, leakage detection accuracy is guaranteed by rotating air cylinder to drive fixed part to form closed environment in test cover;Rocker is fixed on the side wall of cover, cover body and central shaft are rotated by rocker, continuous leakage detection is realized in the process of rotation;Gas detection port is set on the side wall of leakage detection base, which is communicated with leakage detection groove, air tightness test result is obtained.

[0041] The utility model has been described by the above related embodiments, however the above embodiment is only the example of implementing the utility model. In addition, the technical features involved in the different embodiments of the utility model described above can be combined with each other as long as they do not constitute conflict. It must be pointed out that the disclosed embodiments do not limit the scope of the utility model. On the contrary, the changes and decorations made without departing from the spirit and scope of the utility model are within the scope of the patent protection of the utility model.

Claims

1. A gas leak detector for testing the air tightness of a workpiece, characterized by, The detection tool comprises a mounting seat, a leak detection unit and a fixing unit, The leak detection unit comprises a leak detection base, a test cover and a rocker, the leak detection base is fixed on the mounting seat, a leak detection groove is arranged in the middle of the leak detection base, a gas detection port is arranged on the side wall of the leak detection base, the gas detection port is communicated with the leak detection groove, the test cover comprises a cover body and a cover cap, the cover cap is fixed on the cover body, a circular arc surface fixing protrusion is arranged in the middle of the end face of the cover cap away from the cover body, the rocker is fixed on the side wall of the cover cap, a gas cavity is arranged in the middle of the cover body, a gas injection port and a vacuum air outlet are arranged on the side wall of the cover body, the gas injection port and the vacuum air outlet are communicated with the gas cavity, a gas pressure gauge is further arranged on the side wall of the cover body, a test hole is arranged in the middle of the end face of the cover body away from the cover cap, and the test hole is communicated with the gas cavity. The fixing unit comprises a fixing support seat, a corner cylinder and a fixing piece, the fixing support seat is fixed on the mounting seat, the corner cylinder is fixed on the fixing support seat, and the fixing piece is drivingly connected with the corner cylinder, and a fixing recess is arranged on the fixing piece at a position corresponding to the circular arc surface fixing protrusion. The leak detection groove is used to place the workpiece, the workpiece comprises a central shaft and a shell, the central shaft is rotatably arranged in the shell, and an end of the central shaft away from the leak detection groove extends out of the shell. When the detection tool is in a working state, the end of the central shaft away from the leak detection groove is inserted into the test hole and tightly abuts against the inner side wall of the test hole, the corner cylinder drives the fixing piece to make the fixing recess tightly match with the circular arc surface fixing protrusion, the end face of the cover body away from the cover cap tightly abuts against the shell, and the shell tightly abuts against the groove bottom surface of the leak detection groove.

2. A gas leak detector as claimed in claim 1, wherein, The leak detection groove comprises a support part and a leak detection part, the support part and the leak detection part are communicated, the support part is located on the side of the leak detection part away from the mounting seat, the cross-sectional area of the support part is greater than that of the leak detection part, the shell tightly abuts against the groove bottom surface of the support part, and the gas detection port is communicated with the leak detection part.

3. A gas leak detector as claimed in claim 2, wherein A first sealing groove is arranged on the groove bottom surface of the support part at a position corresponding to the shell, and a first sealing ring is arranged in the first sealing groove.

4. A gas leak detector as claimed in claim 1, wherein, A fixing groove is arranged on the side wall of the fixing support seat close to the leak detection base, the side of the leak detection base close to the fixing support seat is located in the fixing groove, a leak detection fixing hole is arranged on the end face of the leak detection base away from the mounting seat at a position corresponding to the fixing groove, a fixing connection hole is arranged on the end face of the fixing support seat away from the mounting seat at a position corresponding to the leak detection fixing hole, and the fixing connection hole and the leak detection fixing hole are connected through a connecting piece.

5. A gas leak detector as described in claim 4, characterized in that, The end face of the leak detection base away from the mounting seat abuts against the groove wall of the fixing groove.

6. A gas leak detector as claimed in claim 4, wherein, The fixed connecting hole comprises a first part and a second part, the first part and the second part are communicated, the first part is located on the side of the second part away from the mounting seat, and an inner diameter of the first part is greater than an inner diameter of the second part.

7. A gas leak detector as claimed in claim 1, wherein, The cover is provided with a second sealing groove on the end face of the cover body close to the periphery of the gas cavity, and a second sealing ring is arranged in the second sealing groove.

8. A gas leak detector as defined in claim 1, wherein The cover body is provided with a third sealing groove on the end face of the cover body away from the cover, and a third sealing ring is arranged in the third sealing groove.

9. A gas leak detector as defined in claim 1, wherein The side wall of the cover is provided with a threaded fixing hole, and the side wall of one end of the rocker close to the cover is provided with an external thread, and the threaded fixing hole and the external thread are matched with each other.

10. A gas leak detector as claimed in claim 1, wherein, The test gas detector is further provided with a test gas detector connected with the gas detection port.

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