Relay

Abstract

Disclosed are a relay and a method for injecting a filler. The relay comprises a sealed housing, a contact assembly, and a filler. The contact assembly comprises a moving contact element and a static contact element. The moving contact element has a moving contact point located in the sealed housing, and the static contact element has a static contact point located in the sealed housing. The moving contact point is configured to make contact with or separate from the static contact point. The filler fills the sealed housing and is used to reduce the risk of the movable contact point and the static contact point sticking to each other.

Description

relay

[0001] Cross-references

[0002] This disclosure claims priority to Chinese Patent No. 202411578034.9, filed on November 6, 2024, entitled "Relay and Method for Injecting Filler," the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of electrical control device technology, and more specifically, to a relay and a method for injecting filler. Background Technology

[0004] A relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit), and is commonly used in automatic control circuits. Essentially, a relay is an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays a role in automatic adjustment, safety protection, and circuit switching in circuits.

[0005] As a type of relay, high-voltage DC relays may experience problems with the closing of moving and stationary contacts in actual use due to the failure of other control devices, such as the absence of a pre-charge circuit or insufficient pre-charge voltage in the pre-charge circuit. In this case, the voltage difference between the two ends of the contacts is large, which can easily generate a breakdown arc, leading to the melting and adhesion of the moving and stationary contacts, thus shortening the service life of the relay.

[0006] Public content

[0007] This disclosure provides a relay and a method for injecting filler to solve the problem of melting and sticking of moving and stationary contacts in related technologies.

[0008] The relay of this disclosure embodiment includes:

[0009] Sealed housing;

[0010] A contact assembly includes a moving contact and a stationary contact, the moving contact having a movable contact located within the sealed housing, and the stationary contact having a stationary contact located within the sealed housing, the moving contact being used to contact or separate from the stationary contact; and

[0011] A filler is placed inside the sealed housing to reduce the risk of the moving contact and the stationary contact sticking together.

[0012] According to some embodiments of this disclosure, the filler is gaseous.

[0013] According to some embodiments of this disclosure, the filling material is a mixture of hydrogen and nitrogen gas.

[0014] According to some embodiments of this disclosure, the nitrogen gas accounts for less than 80% of the volume of the mixed gas.

[0015] According to some embodiments of this disclosure, the nitrogen gas accounts for 30% to 70% of the volume of the mixed gas.

[0016] According to some embodiments of this disclosure, the moving contact is movably disposed within the sealing housing, and the stationary contact is mounted on the sealing housing.

[0017] According to some embodiments of this disclosure, the sealing housing includes an insulating cover, a yoke plate, and a metal cover. The insulating cover is connected to one side surface of the yoke plate in the thickness direction, and the insulating cover and the yoke plate form a first chamber. The metal cover is connected to the other side surface of the yoke plate in the thickness direction, and the insulating cover and the yoke plate form a second chamber. The yoke plate has a through hole that penetrates the yoke plate along its thickness direction. The first chamber communicates with the second chamber through the through hole.

[0018] The contact assembly includes two stationary contacts mounted on the insulating cover, and a movable contact movably disposed within the first cavity. The movable contact has movable contacts at both ends along its length for contacting or separating from the stationary contacts of the two stationary contacts, respectively.

[0019] According to some embodiments of this disclosure, the insulating cover includes a ceramic cover and a frame, the opening of the ceramic cover facing the yoke plate and being connected to the yoke plate via the frame;

[0020] The static contact element is mounted on the ceramic cover.

[0021] According to some embodiments of this disclosure, the sealing housing has an injection hole that penetrates the inner wall surface and the outer wall surface of the sealing housing;

[0022] The relay also includes a tube, one end of which is connected to the sealed housing and communicates with the interior of the sealed housing through the injection hole, and the other end of which is a closed end.

[0023] According to some embodiments of this disclosure, the outer periphery of the fitting has an annular stepped surface, the fitting passes through the injection hole, and the annular stepped surface abuts against the opening edge of the injection hole.

[0024] According to some embodiments of this disclosure, the relay further includes a welding portion connected to the outer peripheral surface of the pipe fitting, and welding the pipe fitting to the sealing housing.

[0025] The method for injecting filler according to embodiments of this disclosure is applied to a relay, the relay including a sealed housing and a contact assembly, the contact assembly including a moving contact and a stationary contact, the moving contact having a moving contact located within the sealed housing, the stationary contact having a stationary contact located within the sealed housing, the moving contact being used to contact or separate from the stationary contact, the sealed housing having an injection hole penetrating the inner and outer wall surfaces of the sealed housing, the method including:

[0026] A storage tank is provided, wherein the storage tank contains a filler;

[0027] The filler is injected into the sealed housing through the injection hole; wherein the filler is used to reduce the risk of the moving contact and the stationary contact sticking together.

[0028] According to some embodiments of this disclosure, the filling material is a mixture of hydrogen and nitrogen gas.

[0029] According to some embodiments of this disclosure, the nitrogen gas accounts for 30% to 70% of the volume of the mixed gas.

[0030] According to some embodiments of this disclosure, the method further includes:

[0031] A fitting is provided, one end of which is connected to the sealing housing and communicates with the injection port, and the other end of which is connected to the storage tank.

[0032] According to some embodiments of this disclosure, the method further includes:

[0033] Once the filler injected into the sealed housing reaches a predetermined amount, the tail section of the pipe is removed, and the opening at the remaining end of the pipe is sealed.

[0034] One embodiment disclosed above has at least the following advantages or beneficial effects:

[0035] The sealed housing of the relay in this embodiment is further filled with a filler. The filler is configured to reduce the risk of adhesion between the moving contact and the stationary contact, thereby preventing the moving and stationary contacts from melting and sticking together, and thus extending the service life of the relay.

[0036] Furthermore, the filler is a mixture of hydrogen and nitrogen. On one hand, hydrogen has a high thermal conductivity, effectively absorbing the heat from the electric arc generated between the moving and stationary contacts and transferring it to the surrounding medium, thus cooling the arc. Additionally, the arc pressure drop in hydrogen is higher, making arc extinguishing easier. On the other hand, nitrogen has a high ionization energy and is less prone to breakdown, resulting in a smaller arc when the moving and stationary contacts come into contact, reducing the melting degree of the moving and stationary contacts and thus lowering the risk of contact adhesion. Moreover, the hydrogen and nitrogen mixture has higher arc stability and a shorter arc time than hydrogen alone, preventing excessive localized energy buildup when the moving and stationary contacts are repeatedly connected, further reducing the risk of contact adhesion.

[0037] Furthermore, if the volume percentage of nitrogen in the gas mixture is between 30% and 70%, it can balance both connection and disconnection, minimizing the risk of contact sticking while also providing a good arc-extinguishing effect. Attached Figure Description

[0038] Figure 1 shows a perspective view of a relay according to an embodiment of the present disclosure.

[0039] Figure 2 shows a cross-sectional view along section AA in Figure 1, where the coil assembly and U-shaped yoke are omitted.

[0040] Figure 3 shows a graph of the number of times the relay is switched on versus the ultimate breaking current.

[0041] Figure 4 shows a schematic diagram with Figure 1 inverted, omitting the coil assembly and U-shaped yoke.

[0042] Figure 5 shows a schematic diagram of the storage tank injecting filler into the relay.

[0043] The reference numerals in the attached drawings are explained as follows: 10, relay; 20, storage tank; 100, sealed housing; 101, first chamber; 102, second chamber; 110, insulating cover; 111, ceramic cover; 112, frame plate; 120, yoke plate; 121, perforation; 122, injection hole; 130, metal cover; 200, contact assembly; 210, moving contact; 220, stationary contact; 300, pipe fitting; 310, annular stepped surface; 510, coil assembly; 520, U-shaped yoke; 530, push rod assembly; 540, welded part. Detailed Implementation

[0044] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0045] It is understood that the terms "comprising" and "having," and any variations thereof, used in the embodiments of this disclosure, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to such processes, methods, products, or apparatus.

[0046] As shown in Figures 1 and 2, the relay 10 of this embodiment includes a sealed housing 100, a contact assembly 200, a push rod member 530, and a coil assembly 510. The contact assembly 200 includes a moving contact 210 and two stationary contacts 220. Each stationary contact 220 has a stationary contact located within the sealed housing 100, and each moving contact 210 has a moving contact located within the sealed housing 100. The moving contacts are used to contact or separate from the stationary contacts. The stationary contacts 220 are mounted in the sealed housing 100, and the moving contacts 210 are movably disposed within the sealed housing 100. Each end of the moving contact 210 has a moving contact, used to contact or separate from the stationary contacts of the two stationary contacts 220, respectively. The push rod member 530 is movably disposed within the sealed housing 100, and the moving contact 210 is mounted on the push rod member 530. The push rod member 530 is used to drive the moving contact 210 to move. The coil assembly 510 is configured to drive the push rod member 530 to move in response to an input signal.

[0047] The moving contact can be integrally formed on the moving contact 210, and the stationary contact can be integrally formed on the stationary contact 220. Of course, in other embodiments, the moving contact and the stationary contact can also be separate parts connected to the moving contact 210 and the stationary contact 220.

[0048] In one embodiment, the sealed housing 100 includes an insulating cover 110, a yoke plate 120, and a metal cover 130. The insulating cover 110 is connected to one side surface of the yoke plate 120 in the thickness direction, and the insulating cover 110 and the yoke plate 120 form a first chamber 101. The metal cover 130 is connected to the other side surface of the yoke plate 120 in the thickness direction, and the insulating cover 110 and the yoke plate 120 form a second chamber 102. The yoke plate 120 has a through hole 121 that penetrates the yoke plate 120 along its thickness direction, and the first chamber 101 communicates with the second chamber 102 through the through hole 121. A stationary contact 220 is mounted on the insulating cover 110, and a movable contact 210 is movably disposed within the first chamber 101. A push rod member 530 is movably disposed within the through hole 121. The coil assembly 510 is located on the side of the yoke plate 120 facing away from the insulating cover 110 and is fitted around the outer periphery of the metal cover 130.

[0049] In one embodiment, the insulating cover 110 includes a ceramic cover 111 and a frame 112. The opening of the ceramic cover 111 faces the yoke plate 120 and is connected to the yoke plate 120 through the frame 112. The static contact 220 is installed on the ceramic cover 111.

[0050] As an example, the ceramic cover 111 is made of ceramic material. The frame piece 112 can be a ring-shaped metal component, such as one made of an iron-nickel alloy. One end of the frame piece 112 is connected to the opening edge of the ceramic cover 111, and the other end is connected to the yoke plate 120. The frame piece 112 is positioned between the ceramic cover 111 and the yoke plate 120 to facilitate the connection between them.

[0051] In one embodiment, the ceramic cover 111 is connected to the frame piece 112, the frame piece 112 is connected to the yoke plate 120, and the metal cover 130 is connected to the yoke plate 120 by welding, but this is not a limitation.

[0052] The relay 10 also includes a U-shaped yoke 520, the two sides of which are connected to the yoke plate 120 so that the U-shaped yoke 520 surrounds the coil assembly 510.

[0053] The relay 10 also includes a filler that fills the sealed housing 100 to reduce the risk of the moving contact of the moving contact 210 sticking to the stationary contact of the stationary contact 220.

[0054] In this embodiment of the present disclosure, the sealed housing 100 of the relay 10 is further filled with a filler. The filler is configured to reduce the risk of adhesion between the moving contact of the moving contact 210 and the stationary contact of the stationary contact 220, thereby preventing the moving and stationary contacts of the moving contact 210 and the stationary contact 220 from melting and sticking together, and thus extending the service life of the relay 10.

[0055] In one embodiment, the filler is gaseous. Of course, in other embodiments, the filler may also be liquid. Whether the filler is gaseous or liquid, it should be insulating.

[0056] In one embodiment, the filling material is a mixture of hydrogen and nitrogen gas.

[0057] In this embodiment, on the one hand, hydrogen has a high thermal conductivity, which can effectively absorb the heat of the electric arc generated between the moving contact 210 and the stationary contact 220 and conduct the heat to the surrounding medium, thus cooling the electric arc; and the arc pressure drop in hydrogen is higher, making it easier to extinguish the arc. On the other hand, nitrogen has a high ionization energy and is not easily broken down, so the electric arc generated when the moving contact 210 and the stationary contact 220 come into contact is smaller, reducing the melting degree of the moving and stationary contacts and thus reducing the risk of contact adhesion. Furthermore, hydrogen and nitrogen form a mixed gas, which has higher arc stability and shorter arc time than hydrogen, so there will be no problem of excessive local energy when the moving contact 210 and the stationary contact 220 are connected multiple times, further reducing the risk of contact adhesion.

[0058] In one embodiment, the volume percentage of nitrogen in the gas mixture is less than 80%. Further, the volume percentage of nitrogen in the gas mixture is between 30% and 70%, for example, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, and 70%.

[0059] Figure 3 shows the curves of the number of times nitrogen is switched on versus the ultimate breaking current under different volume ratios. The blue curve represents the number of times nitrogen is switched on, and the orange curve represents the ultimate breaking current. It should be noted that the above curves were obtained based on tests of the same relay. Furthermore, the horizontal axis represents the volume percentage of nitrogen, and the volume percentage of hydrogen represents the remaining portion. For example, when the horizontal axis is 0.3, it means that the volume percentage of nitrogen is 30%, and the volume percentage of hydrogen is 70%.

[0060] As shown in Figure 3, as the volume ratio of nitrogen gradually increases, the number of contacts gradually increases, while the ultimate breaking current gradually decreases. That is, when the volume ratio of nitrogen is small, the relay 10 has a larger ultimate breaking current, which is beneficial for breaking; when the volume ratio of nitrogen is large, the relay 10 has more switching times, which is beneficial for switching.

[0061] Therefore, in the embodiments of this disclosure, the volume ratio of nitrogen in the mixed gas is between 30% and 70%, which can take into account both connection and disconnection, and has a good arc extinguishing effect while minimizing the risk of contact adhesion.

[0062] As shown in Figures 2 and 3, the sealing housing 100 has an injection hole 122 that penetrates both the inner and outer walls of the sealing housing 100. The relay 10 also includes a tube 300, one end of which is connected to the sealing housing 100 and communicates with the interior of the sealing housing 100 through the injection hole 122; the other end of the tube 300 is closed. Filler material can be injected into the sealing housing 100 through the tube 300.

[0063] In this embodiment of the present disclosure, the injection hole 122 is formed on the yoke plate 120. Of course, in other embodiments, the injection hole 122 may also be formed on any one of the metal cover 130, the frame plate 112, and the ceramic cover 111.

[0064] In one embodiment, the outer periphery of the fitting 300 has an annular stepped surface 310, the fitting 300 passes through the injection hole 122, and the annular stepped surface 310 abuts against the opening edge of the injection hole 122. The relay 10 also includes a welding part 540, which is connected to the outer peripheral surface of the fitting 300 and welds the fitting 300 to the sealing housing 100.

[0065] In this embodiment of the present disclosure, the tube 300 is inserted into the injection hole 122, the annular stepped surface 310 abuts against the opening edge of the injection hole 122, and the tube 300 is welded to the sealing shell 100 through the welding part 540, so that the tube 300 and the sealing shell 100 are more firmly connected, and the tube 300 is prevented from accidentally falling off the sealing shell 100 during the process of injecting filler into the sealing shell 100 through the tube 300, which would cause the filler to leak out.

[0066] In another aspect, the present invention provides a method for injecting filler material, applied to a relay 10. The relay 10 includes a sealed housing 100 and a contact assembly 200. The contact assembly 200 includes a movable contact 210 movably disposed within the sealed housing 100 and two stationary contacts 220 mounted on the sealed housing 100. The movable contact 210 is used to contact or separate from the two stationary contacts 220. The sealed housing 100 has an injection hole 122 penetrating the inner and outer wall surfaces of the sealed housing 100. The method for injecting filler material includes: providing a storage tank 20 containing filler material; injecting filler material into the sealed housing 100 through the injection hole 122; wherein the filler material is used to reduce the risk of adhesion between the movable contact 210 and the stationary contacts 220.

[0067] In one embodiment, the filling material is a mixture of hydrogen and nitrogen gas.

[0068] In this embodiment, hydrogen and nitrogen are first mixed in storage tank 20 according to a set volume ratio to form a mixed gas, and then the mixed gas is injected into the sealed housing 100. This method of mixing before injection makes it easier for operators to perform the injection work. In addition, mixing hydrogen and nitrogen in storage tank 20 in advance to form a mixed gas also facilitates standardized operations, and the volume ratio of the mixed gas is more accurate and consistent.

[0069] In one embodiment, the volume percentage of nitrogen in the gas mixture is less than 80%. Further, the volume percentage of nitrogen in the gas mixture is between 30% and 70%, for example, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, and 70%.

[0070] In one embodiment, the method further includes providing a fitting 300, one end of which is connected to a sealing housing 100 and communicates with an injection port 122, and the other end of which is connected to a storage tank 20.

[0071] In this embodiment of the present disclosure, the storage tank 20 and the other end of the pipe fitting 300 can be connected by means of clamps, flanges or the like, without directly connecting the storage tank 20 to the sealing housing 100 of the relay 10. On the one hand, this avoids damage to the sealing housing 100; on the other hand, the length of the pipe fitting 300 can be designed to be longer, making it more convenient for workers to perform the connection work.

[0072] In one embodiment, the method further includes: after the filler injected into the sealing housing 100 reaches a predetermined amount, removing the tail section of the pipe 300 and closing the opening at the end of the remaining pipe 300; wherein the length of the remaining pipe 300 is less than the length of the removed pipe 300.

[0073] In this embodiment of the present disclosure, after the filler is injected, part of the tube 300 is removed, and the length of the remaining tube 300 is less than the length of the removed tube 300. This reduces the volume occupied by the remaining tube 300, which is beneficial for miniaturizing the relay 10.

[0074] The remaining pipe fittings 300 can be closed by means of welding, but are not limited to this method.

[0075] In summary, the relay 10 and the method of injecting filler according to the embodiments of this disclosure have at least the following advantages and beneficial effects:

[0076] In this embodiment of the present disclosure, the sealed housing 100 of the relay 10 is further filled with a filler. The filler is configured to reduce the risk of adhesion between the moving contact 210 and the stationary contact 220, thereby preventing the moving and stationary contacts between the moving contact 210 and the stationary contact 220 from melting and sticking together, and thus extending the service life of the relay 10.

[0077] Furthermore, the filler is a mixture of hydrogen and nitrogen. On one hand, hydrogen has a high thermal conductivity, effectively absorbing the heat from the arc generated between the moving contact 210 and the stationary contact 220 and transferring it to the surrounding medium, thus cooling the arc. Additionally, the arc pressure drop in hydrogen is higher, making arc extinguishing easier. On the other hand, nitrogen has a high ionization energy and is less prone to breakdown. Therefore, the arc generated when the moving contact 210 and stationary contact 220 come into contact is smaller, reducing the melting degree of the moving and stationary contacts and thus reducing the risk of contact adhesion. Moreover, the hydrogen and nitrogen mixture has higher arc stability and a shorter arc time than hydrogen alone. Therefore, when the moving contact 210 and stationary contact 220 are repeatedly switched on and off, there will be no problem of excessive local energy, further reducing the risk of contact adhesion.

[0078] Furthermore, if the volume percentage of nitrogen in the gas mixture is between 30% and 70%, it can balance both connection and disconnection, minimizing the risk of contact sticking while also providing a good arc-extinguishing effect.

[0079] It is understood that the various embodiments / implementations provided in this disclosure can be combined with each other without creating contradictions, and will not be described in detail here.

[0080] In the disclosed embodiments, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the disclosed embodiments according to the specific circumstances.

[0081] In the description of the disclosed embodiments, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", 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 the disclosed embodiments and simplifying the description, and do not indicate or imply that the device or unit 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 the disclosed embodiments.

[0082] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the disclosed embodiments. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0083] The above are merely preferred embodiments of the disclosed embodiments and are not intended to limit the disclosed embodiments. For those skilled in the art, the disclosed embodiments can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the disclosed embodiments should be included within the protection scope of the disclosed embodiments.

Claims

1. A relay, characterized in that, include: Sealed housing; A contact assembly includes a moving contact and a stationary contact, the moving contact having a moving contact located within the sealed housing, and the stationary contact having a stationary contact located within the sealed housing, the moving contact being used to contact or separate from the stationary contact; as well as A filler is placed inside the sealed housing to reduce the risk of the moving contact and the stationary contact sticking together.

2. The relay according to claim 1, characterized in that, The filling material is in a gaseous state.

3. The relay according to claim 2, characterized in that, The filling material is a mixture of hydrogen and nitrogen gas.

4. The relay according to claim 3, characterized in that, The nitrogen gas accounts for less than 80% of the volume of the mixed gas.

5. The relay according to claim 4, characterized in that, The nitrogen gas constitutes 30% to 70% of the volume of the mixed gas.

6. The relay according to any one of claims 1-5, characterized in that, The moving contact is movably disposed within the sealing housing, and the stationary contact is mounted on the sealing housing.

7. The relay according to claim 6, characterized in that, The sealed housing includes an insulating cover, a yoke plate, and a metal cover. The insulating cover is connected to one side surface of the yoke plate in the thickness direction, and the insulating cover and the yoke plate form a first chamber. The metal cover is connected to the other side surface of the yoke plate in the thickness direction, and the insulating cover and the yoke plate form a second chamber. The yoke plate has a perforation that penetrates the yoke plate along its thickness direction. The first chamber communicates with the second chamber through the perforation. The contact assembly includes two stationary contacts mounted on the insulating cover, and a movable contact movably disposed within the first cavity. The movable contact has movable contacts at both ends along its length for contacting or separating from the stationary contacts of the two stationary contacts, respectively.

8. The relay according to claim 7, characterized in that, The insulating cover includes a ceramic cover and a frame plate. The opening of the ceramic cover faces the yoke plate and is connected to the yoke plate through the frame plate. The static contact element is mounted on the ceramic cover.

9. The relay according to any one of claims 1-5, characterized in that, The sealing housing has an injection hole that penetrates both the inner and outer wall surfaces of the sealing housing. The relay also includes a tube, one end of which is connected to the sealed housing and communicates with the interior of the sealed housing through the injection hole, and the other end of which is a closed end.

10. The relay according to claim 9, characterized in that, The outer periphery of the pipe has an annular stepped surface, the pipe passes through the injection hole, and the annular stepped surface abuts against the opening edge of the injection hole.

11. The relay according to claim 10, characterized in that, The relay also includes a welding part connected to the outer peripheral surface of the pipe fitting, and welding the pipe fitting to the sealing housing.

12. A method of injecting filler, applied to a relay, the relay including a sealed housing and a contact assembly, the contact assembly including a moving contact and a stationary contact, the moving contact having a moving contact located within the sealed housing, the stationary contact having a stationary contact located within the sealed housing, the moving contact being used to contact or separate from the stationary contact, the sealed housing having an injection hole penetrating an inner wall surface and an outer wall surface of the sealed housing, characterized in that... The method includes: A storage tank is provided, wherein the storage tank contains a filler; The filler is injected into the sealed housing through the injection hole; wherein the filler is used to reduce the risk of the moving contact and the stationary contact sticking together.

13. The method according to claim 12, characterized in that, The filling material is a mixture of hydrogen and nitrogen gas.

14. The method according to claim 13, characterized in that, The nitrogen gas constitutes 30% to 70% of the volume of the mixed gas.

15. The method according to claim 12, characterized in that, The method further includes: A fitting is provided, one end of which is connected to the sealing housing and communicates with the injection port, and the other end of which is connected to the storage tank.

16. The method according to claim 15, characterized in that, The method further includes: Once the filler injected into the sealed housing reaches a predetermined amount, the tail section of the pipe is removed, and the opening at the remaining end of the pipe is sealed.

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