Vacuum arc-extinguishing chamber part airtightness detection tool and detection method

Abstract

The invention discloses a vacuum arc-extinguishing chamber part airtightness detection tool and detection method, and relates to the technical field of airtightness detection. Comprising a cylindrical main body and a sealing member, the upper end of the cylindrical main body is provided with a first sealing cooperation structure used for being in sealing cooperation with a porcelain shell connection port of a to-be-detected movable cover plate, and the lower end of the cylindrical main body is provided with a second sealing cooperation structure used for being in sealing cooperation with a mass spectrum leak detector detection pedestal. And the sealing element is used for sealing a connecting rod connecting port of a to-be-detected movable cover plate, so that a sealed inner cavity which is communicated with an air outlet hole of the mass spectrum leak detector detection base is formed after the cylindrical main body is respectively matched with the to-be-detected movable cover plate and the mass spectrum leak detector detection base in a sealing manner. The device can effectively improve the detection efficiency of the airtightness of the vacuum arc-extinguishing chamber part, and is good in adaptability.

Description

Technical Field

[0001] The invention relates to the technical field of air tightness detection, and in particular to an air tightness detection tool and a detection method for vacuum interrupter parts. Background Art

[0002] The air tightness requirements of vacuum arc chamber products are high. During the production process, a mass spectrometer leak detector is required to test the air tightness of the moving cover of the vacuum arc chamber. The moving cover includes a bellows and connecting ends welded to both ends of the bellows. The two connecting ends constitute two ports, namely the porcelain shell connection port and the connecting rod connection port. The existing detection scheme mainly relies on the porcelain shell connection port to match the porcelain shell, and the connecting rod connection port to connect the connecting rod, and then perform the detection. The detection process is complicated and difficult to disassemble, resulting in low detection efficiency. Some larger covers have no special tooling adaptation, and detection is more difficult. Therefore, designing a set of vacuum arc chamber parts air tightness detection tooling with high detection efficiency and good adaptability has become an urgent problem to be solved at this stage. Summary of the invention

[0003] The purpose of the present invention is to provide a vacuum arc chamber parts airtightness detection tool to solve the problems of low detection efficiency and poor adaptability of existing vacuum arc chamber parts airtightness detection tool; the purpose of the present invention is also to provide a vacuum arc chamber parts airtightness detection method to solve the problems of low detection efficiency and poor adaptability of existing vacuum arc chamber parts airtightness detection method.

[0004] To achieve the above-mentioned purpose, a vacuum arc chamber parts airtightness detection tool of the present invention adopts the following technical scheme: it includes a cylindrical main body and a sealing member, the upper end of the cylindrical main body has a first sealing matching structure for sealingly matching with the porcelain shell connection port of the moving cover plate to be tested, and the lower end of the cylindrical main body has a second sealing matching structure for sealingly matching with the detection base of the mass spectrometer leak detector, and the sealing member is used to seal the connecting rod connection port of the moving cover plate to be tested, so that after the cylindrical main body is sealed with the moving cover plate to be tested and the detection base of the mass spectrometer leak detector respectively, a sealed inner cavity connected to the air outlet of the detection base of the mass spectrometer leak detector is formed together.

[0005] The beneficial effect of the above technical scheme is that: the present invention proposes a new vacuum arc chamber parts airtightness detection tooling, by setting a cylindrical main body and a sealing member, a first sealing matching structure is set at the upper end of the cylindrical main body, which can be sealed and matched with the porcelain shell connection port of the moving cover plate to be tested, and the second sealing matching structure can seal the lower end of the cylindrical main body with the detection base of the mass spectrometer leak detector. A sealing member is provided to seal the connecting rod connection port of the moving cover plate to be tested, which is convenient to install and disassemble, and has high detection efficiency. After the tooling is installed, a sealed inner cavity connected to the air outlet of the detection base of the mass spectrometer leak detector is formed, the overall sealing is good, and the detection will be more accurate; different sizes of cylindrical main bodies can also be selected to perform airtightness detection on moving cover plates of different sizes to be tested, and the adaptability is good.

[0006] Preferably, the upper end of the cylindrical body is stepped with a high outer side and a low inner side, so that an annular groove communicating with the sealed inner cavity of the cylindrical body is formed at the step surface, and the first sealing structure is a sealing ring installed in the annular groove.

[0007] The beneficial effect of the above technical solution is that the ring groove with a high outer side and a low inner side connected to the inner cavity has better sealing performance, and the sealing ring can improve the sealing performance between the ceramic shell connection port of the movable cover plate to be tested and the cylindrical body.

[0008] Preferably, the height of the sealing ring is not higher than the groove edge of the annular groove.

[0009] The beneficial effect of the above technical solution is that the height of the sealing ring is not higher than the groove edge of the ring groove. When the movable cover plate to be tested is installed on the sealing ring in the ring groove, the porcelain shell connection port of the movable cover plate to be tested will form a groove with the side wall of the ring groove. During the subsequent liquid sealing, the liquid will flow into the groove, thereby achieving a better sealing effect.

[0010] Preferably, the sealing ring is a silicone sealing ring.

[0011] The beneficial effects of the above technical solution are: the silicone is relatively soft, there are fewer gaps after matching, the sealing is better, the probability of air leakage in the tooling is reduced, and the accuracy of the inspection results is improved.

[0012] Preferably, the second sealing matching structure is the lower end surface of the cylindrical body, and the lower end surface is an annular plane.

[0013] The beneficial effect of the above technical solution is that the annular plane is stably placed on the detection base of the mass spectrometer leak detector, and can be sealed and matched with the detection base of the mass spectrometer leak detector in a natural state.

[0014] Preferably, the sealing member comprises a gland and a sealing rubber pad arranged on the lower side of the gland.

[0015] The beneficial effects of the above technical solution are: a sealing rubber pad is provided on the lower side, which has better sealing performance when covered on the movable cover plate to be tested, and a pressure cover is provided on the upper part to increase the weight of the seal. The connecting port of the connecting rod of the movable cover plate to be tested can be covered and pressed by gravity, thereby enhancing the sealing performance.

[0016] To achieve the above-mentioned purpose, a technical solution of a method for detecting air tightness of parts of a vacuum arc extinguishing chamber of the present invention comprises the following steps: step one, placing a cylindrical main body on a detection base of a mass spectrometer leak detector, installing a porcelain shell connection port of a movable cover plate to be tested in a first sealing matching structure of the cylindrical main body, and finally sealing a connecting rod connection port of the movable cover plate to be tested; step two, pumping negative pressure into an inner cavity of a tooling, and releasing helium around the tooling; step three, pumping air into the sealed inner cavity to detect whether helium has entered the inner cavity. If the mass spectrometer leak detector detects that there is helium in the sealed inner cavity, it is determined that the air tightness of the movable cover plate to be tested is unqualified. If the mass spectrometer leak detector detects that there is no helium in the sealed inner cavity, it is determined that the air tightness of the movable cover plate to be tested is qualified.

[0017] The beneficial effect of the above technical solution is that: the present invention proposes a new method for detecting the air tightness of vacuum arc chamber parts, by releasing helium around the air tightness detection tooling, using a mass spectrometer leak detector to evacuate the sealed inner cavity to detect whether there is helium, thereby judging whether the air tightness of the movable cover plate to be tested meets the requirements, the operation is simple, and the detection efficiency is high; the movable cover plates to be tested of different sizes can also be detected by replacing the cylindrical body, and the method has strong adaptability.

[0018] Preferably, after step 1 is completed, the joints of the mass spectrometer leak detector detection base, the cylindrical body, the movable cover plate to be tested and the sealing member are all liquid-sealed.

[0019] The beneficial effects of the above technical solution are: the sealing performance of the tooling is better after liquid sealing, it is not easy to leak, and the detection is more accurate.

[0020] Preferably, alcohol is used for liquid sealing.

[0021] The beneficial effects of the above technical solution are: alcohol has a large molecular weight, and the use of alcohol for liquid sealing has a better sealing effect; and alcohol is volatile, so the drying step is omitted after the air-tightness test is completed.

[0022] Preferably, helium is first released at the sealing mating position on the outside of the tooling, and a mass spectrometer leak detector is used to detect whether there is helium in the sealed inner cavity. If not, helium is released at the external welding position of the movable cover plate to be tested and then tested; if so, it is necessary to check whether each joint is completely sealed, and after sealing is completed, the air tightness test of the movable cover plate to be tested is performed.

[0023] The beneficial effect of the above technical solution is that: first, helium is released at each joint on the outside of the tooling to test whether it is qualified, so that it can be determined whether the sealing of each joint meets the requirements. If it meets the requirements, the air tightness test of the movable cover to be tested can be carried out; if it does not meet the requirements, it is necessary to completely seal each joint before testing, and the test result will be more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an assembly drawing of Example 1 of a vacuum arc chamber parts airtightness detection tool of the present invention.

[0025] In the figure: 1. cylindrical body; 2. pressure cover; 3. sealing rubber pad; 4. movable cover plate to be tested; 5. detection base of mass spectrometer leak detector; 6. air outlet; 7. silicone sealing ring; 8. sealed inner cavity; 9. porcelain shell connection port; 10. connecting rod connection port. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0028] It should be noted that relational terms such as "first" and "second" that may appear are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, terms such as "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by a sentence such as "comprises a..." does not exclude the existence of other identical elements in the process, method, article or device that includes the element.

[0029] Specific embodiment 1 of a vacuum interrupter parts airtightness detection tool of the present invention:

[0030] like Figure 1 As shown, it includes a cylindrical body 1 and a sealing member. The cylindrical body 1 is cylindrical. The upper end of the cylindrical body 1 is a stepped shape with a high outer side and a low inner side, so that an annular groove communicating with the sealed inner cavity 8 of the cylindrical body 1 is formed at the step surface. A sealing ring is installed in the annular groove. The sealing ring is a silicone sealing ring 7. The porcelain shell connection port 9 of the moving cover plate 4 to be tested can be sealed with the silicone sealing ring 7 in the annular groove of the cylindrical body 1; the lower end of the cylindrical body 1 is an annular plane, which is placed on the detection base 5 of the mass spectrometer leak detector. Due to the effect of gravity, One end of the annular plane of the cylindrical main body 1 can be sealed with the detection base of the mass spectrometer leak detector; a sealing member is installed on the connecting rod connection port 10 of the movable cover plate 4 to be tested, and the sealing member includes a pressure cover 2 and a sealing rubber gasket 3 arranged on the lower side of the pressure cover; the sealing member is used to seal the connecting rod connection port 10 of the movable cover plate 4 to be tested, so that after the cylindrical main body 1 is sealed with the movable cover plate 4 to be tested and the detection base of the mass spectrometer leak detector respectively, a sealed inner cavity 8 connected with the air outlet 6 of the detection base 5 of the mass spectrometer leak detector is formed together.

[0031] A specific embodiment 1 of a vacuum interrupter parts airtightness detection tooling of the present invention is provided with a cylindrical body 1 and a sealing member. The lower end surface of the cylindrical body 1 is set as an annular plane. The annular plane is placed on the detection base of the mass spectrometer leak detector for greater stability, and can be sealed and matched with the detection base of the mass spectrometer leak detector in a natural state; an annular groove communicating with the sealed inner cavity of the cylindrical body 1 is provided at the upper end of the cylindrical body, and a silicone sealing ring is installed in the annular groove. The silicone sealing ring is relatively soft and has a better sealing effect, and can be sealed and matched with the porcelain shell connection port of the moving cover plate 4 to be tested. The high sealing ring 7 is provided The degree is not higher than the groove edge of the ring groove, so that the liquid will flow into the groove during the subsequent liquid sealing, which has a better sealing effect; the sealing member is sealed with the connecting rod connecting port 10 of the movable cover plate to be tested, so that the cylindrical body 1, the movable cover plate to be tested 4, the sealing member and the mass spectrometer leak detector detection base 5 together form a sealed inner cavity 8 connected to the air outlet 6 of the mass spectrometer leak detector detection base 5; it is easy to install and use, has good overall sealing after assembly, and has high detection efficiency; different sizes of cylindrical bodies 1 can also be selected to perform airtightness detection on movable cover plates 4 to be tested of different sizes, and has good adaptability.

[0032] Embodiment 2 of a vacuum arc chamber parts airtightness detection tool of the present invention, in this embodiment, the lower end of the cylindrical main body may not be set as an annular plane, but may be set as an annular inverted triangle structure, which is pressed into the mass spectrometer leak detector detection base when in use. The rest is the same as Embodiment 1 and will not be repeated.

[0033] Embodiment 3 of a vacuum arc chamber parts airtightness detection tool of the present invention, in this embodiment, the sealing member may not be set as a pressure cover and a sealing rubber pad arranged on the lower side of the pressure cover, but all of them may be set as sealing rubber pads, and the rest is the same as embodiment 1 and will not be repeated.

[0034] Embodiment 4 of a vacuum arc chamber parts air tightness detection tool of the present invention, in this embodiment, the sealing ring can also be set as a rubber sealing ring, and the rest is the same as embodiment 1 and will not be repeated.

[0035] Embodiment 5 of a vacuum arc chamber parts airtightness detection tool of the present invention, in this embodiment, no annular groove may be set on the upper end of the cylindrical body, and a sealing ring is directly bonded to the upper end of the cylindrical body, and the porcelain shell connection port of the moving cover plate to be tested is placed on the sealing ring. The rest is the same as Embodiment 1 and will not be repeated.

[0036] Embodiment 6 of a vacuum arc chamber parts air tightness detection tool of the present invention, in this embodiment, a plug can also be used as a sealing member, when in use, the plug is inserted into the connecting rod connection port of the moving cover plate to be tested, and the rest is the same as embodiment 1 and will not be repeated.

[0037] Embodiment 7 of a vacuum arc chamber parts air tightness detection tool of the present invention, in this embodiment, the sealing ring can also be higher than the edge of the ring groove, and the sealing ring is installed in the ring groove when in use, and the porcelain shell connection port of the moving cover plate to be tested is placed on the sealing ring. The rest is the same as Embodiment 1 and will not be repeated.

[0038] Specific embodiment 1 of a method for detecting air tightness of vacuum interrupter parts of the present invention:

[0039] like Figure 1 As shown, in step one, first place the annular plane end of the cylindrical body 1 downward on the detection base 5 of the mass spectrometer leak detector, the porcelain shell connection port 9 of the movable cover plate 4 to be tested is installed on the sealing ring 7 in the annular groove of the cylindrical body 1, and the connecting rod connection port 10 of the movable cover plate 4 to be tested is sealed with a sealing member, and the joints of the detection base of the mass spectrometer leak detector, the cylindrical body, the movable cover plate to be tested and the sealing member are all liquid-sealed.

[0040] Step 2, draw negative pressure on the sealed inner cavity 8 of the tooling, first release helium at the joints of the external cylindrical body 1 of the tooling, the seal, the mass spectrometer leak detector detection base 5 and the movable cover plate 4 to be tested, and detect whether there is helium entering the inside of the tooling. If there is no helium, it means that the seals at the joints are intact and there is no problem. The sealing of the tooling is qualified, and the movable cover plate 4 to be tested can be tested; if the mass spectrometer leak detector detects that helium has entered the inside of the tooling, it means that there is a problem of loose sealing at the joints, and it is necessary to check whether the joints are completely sealed. After the sealing is completed, the air tightness test of the movable cover plate 4 to be tested is carried out.

[0041] Step three, helium is released at the external welding point of the movable cover plate 4 to be tested, and the vacuum port of the mass spectrometer leak detector exhausts the internal chamber of the tooling to detect whether helium enters the internal chamber. If the mass spectrometer leak detector detects helium in the internal chamber, it is determined that the air tightness of the movable cover plate 4 to be tested is unqualified; if the mass spectrometer leak detector detects that there is no helium in the internal chamber, it is determined that the air tightness of the movable cover plate 4 to be tested is qualified.

[0042] Embodiment 1 of a method for detecting air tightness of parts of a vacuum arc chamber of the present invention sets up such a tool for detecting air tightness of parts of a vacuum arc chamber, and first releases helium at each joint on the outside of the tool to detect whether it is qualified, so as to judge whether the sealing of each joint of the tool is intact, thereby effectively preventing the tool from not being completely sealed and thus affecting the accuracy of the result; by releasing helium around the air tightness detection tool, using a mass spectrometer leak detector to evacuate the sealed inner cavity to detect whether there is helium, thereby judging whether the air tightness of the movable cover plate to be tested is qualified, the operation is simple, and the method has high detection efficiency; different sizes of movable cover plates to be tested can also be detected by replacing cylindrical bodies of different sizes, and the method has good adaptability.

[0043] Embodiment 2 of a method for detecting air tightness of parts of a vacuum arc extinguishing chamber of the present invention: In this embodiment, water can also be used for liquid sealing at the joints of each component. The rest is the same as embodiment 1 and will not be repeated.

[0044] Embodiment 3 of a method for detecting air tightness of parts of a vacuum arc extinguishing chamber of the present invention: In this embodiment, the joints between the components may not be sealed with liquid, and the rest is the same as embodiment 1 and will not be described in detail.

[0045] Embodiment 4 of a method for testing air tightness of parts of a vacuum arc extinguishing chamber of the present invention: In this embodiment, it is not necessary to perform a tool sealing test on the joints outside the tool, but directly perform an air tightness test on the welding parts of the movable cover plate to be tested. The rest is the same as Embodiment 1 and will not be repeated.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A vacuum interrupter parts air tightness detection tool, characterized in that: The invention comprises a cylindrical body (1) and a sealing member (2), wherein the upper end of the cylindrical body (1) has a first sealing matching structure for sealingly matching with a ceramic shell connection port (9) of a movable cover plate (4) to be tested, and the lower end of the cylindrical body (1) has a second sealing matching structure for sealingly matching with a detection base (5) of a mass spectrometer leak detector, and the sealing member is used to seal the connecting rod connection port (10) of the movable cover plate (4) to be tested, so that after the cylindrical body (1) is sealedly matched with the movable cover plate (4) to be tested and the detection base of the mass spectrometer leak detector, a sealed inner cavity (8) connected to the air outlet (6) of the detection base (5) of the mass spectrometer leak detector is formed together.

2. The vacuum interrupter parts air tightness detection tool according to claim 1 is characterized in that: The upper end of the cylindrical body (1) is in a stepped shape with a high outer side and a low inner side, thereby forming an annular groove communicating with the sealed inner cavity (8) of the cylindrical body (1) at the step surface, and the first sealing matching structure is a sealing ring (7) installed in the annular groove.

3. The vacuum interrupter parts air tightness detection tool according to claim 2 is characterized in that: The height of the sealing ring (7) is not higher than the groove edge of the annular groove.

4. The vacuum interrupter parts air tightness detection tool according to claim 2, characterized in that: The sealing ring (7) is a silicone sealing ring.

5. The vacuum interrupter parts air tightness detection tool according to any one of claims 1 to 4, characterized in that: The second sealing matching structure is the lower end surface of the cylindrical body (1), and the lower end surface is an annular plane.

6. The vacuum interrupter parts air tightness detection tool according to any one of claims 1 to 4, characterized in that: The sealing member comprises a gland (2) and a sealing rubber pad (3) arranged on the lower side of the gland.

7. A method for detecting air tightness of vacuum interrupter parts, comprising the air tightness detection tool for vacuum interrupter parts according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1, placing the cylindrical body (1) on the detection base (5) of the mass spectrometer leak detector, installing the porcelain shell connection port (9) of the movable cover plate (4) to be tested in the first sealing matching structure of the cylindrical body (1), and finally sealing the connecting rod connection port (10) of the movable cover plate (4) to be tested; Step 2, pumping negative pressure into the sealed inner cavity, and releasing helium near the outside of the tooling; Step 3, pumping air into the sealed inner cavity to detect whether helium enters the sealed inner cavity. If the mass spectrometer leak detector detects that there is helium in the sealed inner cavity, it is determined that the air tightness of the movable cover plate (4) to be tested is unqualified; if the mass spectrometer leak detector detects that there is no helium in the sealed inner cavity, it is determined that the air tightness of the movable cover plate to be tested is qualified.

8. The method for detecting air tightness of vacuum interrupter parts according to claim 7, characterized in that: After step 1 is completed, the joints of the mass spectrometer leak detector detection base (5), the cylindrical body (1), the movable cover plate to be tested (4) and the sealing member are all sealed with liquid.

9. The method for detecting air tightness of vacuum interrupter parts according to claim 8, characterized in that: Use alcohol for liquid sealing.

10. The method for detecting air tightness of vacuum interrupter parts according to claim 7, characterized in that: First, helium is released at the sealing position of the tooling outside, and a mass spectrometer leak detector is used to detect whether there is helium in the sealed inner cavity. If not, helium is released at the external welding position of the movable cover plate (4) to be tested and then tested; if so, it is necessary to check whether each joint is completely sealed, and after the sealing is completed, the air tightness test of the movable cover plate (4) to be tested is performed.

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