Movable conducting rod for vacuum arc-extinguishing chamber

Abstract

The utility model relates to the technical field of vacuum arc-extinguishing chamber components, in particular to a movable conducting rod for a vacuum arc-extinguishing chamber, which comprises a rod body, a plurality of thermal bimetal sheets and a plurality of lubricating grease, a plurality of grooves and a plurality of first annular grooves are formed in the side wall of one end of the rod body, a thermal bimetal sheet is arranged in each groove, and a plurality of first annular grooves are formed in the side wall of the other end of the rod body. The rod body is provided with a plurality of thermal bimetal sheets, active layers of the thermal bimetal sheets face a groove opening of the groove, the active layer of each thermal bimetal sheet is connected with lubricating grease, and when the thermal bimetal sheets are in a non-deformation state, the sides, away from the thermal bimetal sheets, of the lubricating grease are close to or flush with the opening edge of the groove opening of the groove. And the thermal bimetallic strip deforms and pushes the lubricating grease out of the notch of the groove to be fully lubricated with the inner wall of the external guide sleeve, so that the advantages of effectively reducing the abrasion of the sealing ring and being beneficial to prolonging the overall service life of the vacuum arc-extinguishing chamber are realized.

Description

Technical Field

[0001] The present application relates to the technical field of vacuum interrupter components, and more specifically to a movable conductive rod for a vacuum interrupter. Background Art

[0002] The vacuum interrupter is the core component of medium and high voltage power switches. Through the excellent insulation of the vacuum in the tube, the medium and high voltage circuit can quickly extinguish the arc and suppress the current after the power is cut off, avoiding accidents and unexpected events. It is widely used in power transmission and distribution control systems in the fields of electricity. The vacuum interrupter includes a moving conductive rod, which is moved to abut or separate from the static conductive rod, thereby realizing the on and off of the circuit.

[0003] Our company currently has a kind of dynamic conductive rod, such as Figure 1 As shown, it is slidably arranged on the vacuum interrupter, and the vacuum interrupter also includes a ceramic shell 90, a moving end cover 91, a guide sleeve 92, a bellows 93 and a static conductive rod 94. The ceramic shell 90 has a vacuum cavity 901. The moving end cover 91 is arranged at one end of the ceramic shell 90. The guide sleeve 92 is fixedly installed on the moving end cover 91. The moving conductive rod includes a rod body 95. One end of the rod body 95 passes through the guide sleeve 92 and extends into the vacuum cavity 90. 1 and abut against or separate from the static conductive rod 94, the two ends of the bellows 93 are respectively connected to the rod body 95 and the moving end cover 91. In order to prevent the outside air from flowing into the vacuum chamber 901 from the side of the rod body 95 and the guide sleeve 92, the end of the rod body 95 close to the guide sleeve 92 has a plurality of annular grooves 951, and a sealing ring 96 is sleeved in each of the annular grooves 951, and the sealing ring 96 is in contact with the inner hole wall of the guide sleeve 92. However, in the prior art, only a layer of lubricating liquid is applied to the outer wall of the rod body 95. After the vacuum interrupter is used for a long time, due to the frequent sliding of the moving conductive rod relative to the static conductive rod 94, the sealing ring 96 is easy to wear and the sealing performance is reduced after the lubricating liquid dries up and evaporates, resulting in the infiltration of outside air into the vacuum chamber 901, the vacuum degree is reduced, and the arc extinguishing performance of the vacuum interrupter is reduced.

[0004] Therefore, there is a need to provide a movable conductive rod for a vacuum interrupter that can effectively reduce the wear of the sealing ring and help extend the overall life of the vacuum interrupter. Summary of the invention

[0005] The main purpose of the present application is to provide a dynamic conductive rod for a vacuum arc chamber, which is slidably arranged on the vacuum arc chamber, wherein the dynamic conductive rod for the vacuum arc chamber includes a rod body, a plurality of thermal bimetallic strips and a plurality of greases, a side wall at one end of the rod body has a plurality of grooves and a plurality of first annular grooves, a thermal bimetallic strip is arranged in each of the grooves, the active layer of the thermal bimetallic strip faces the notch of the groove, the grease corresponds to the thermal bimetallic strip one by one, and a grease is connected to the active layer of each thermal bimetallic strip. When the thermal bimetallic strip is in an undeformed state, the side of the grease away from the thermal bimetallic strip is close to or flush with the edge of the notch of the groove. When the temperature of the rod body is high, the thermal bimetallic strip is deformed and the grease is pushed out of the notch of the groove and fully lubricated with the inner wall of the external guide sleeve. Compared with the prior art, it has the advantages of effectively reducing the wear of the sealing ring and helping to extend the overall life of the vacuum arc chamber.

[0006] Another object of the present application is to provide a dynamic conductive rod for a vacuum arc chamber, wherein the dynamic conductive rod for the vacuum arc chamber also includes a plurality of connecting parts, the connecting parts correspond to the thermal bimetallic strips one by one, a connecting part is provided between each thermal bimetallic strip and the corresponding grease, the two ends of the connecting part are respectively connected to the thermal bimetallic strip and the grease, each of the connecting parts includes a disk body and a plurality of extension parts arranged along the circumference of the disk body, the extension part extends a predetermined distance away from the thermal bimetallic strip and penetrates into the grease, the side of the disk body away from the extension part is connected to the thermal bimetallic strip, and the connection between the thermal bimetallic strip and the grease is achieved through the connecting part.

[0007] In order to achieve at least one of the above-mentioned invention purposes, the present application provides a movable conductive rod for a vacuum interrupter, which is slidably arranged on the vacuum interrupter, wherein the movable conductive rod for the vacuum interrupter comprises:

[0008] A rod body, wherein a side wall at one end of the rod body has a plurality of grooves and a plurality of first annular grooves; and

[0009] A plurality of thermal bimetallic strips, each of the grooves is provided with a thermal bimetallic strip, and the active layer of the thermal bimetallic strip faces the notch of the groove; and

[0010] A plurality of lubricating greases, each of which corresponds to the thermal bimetallic strips one by one, and each active layer of the thermal bimetallic strips is connected with a lubricating grease, and when the thermal bimetallic strips are in an undeformed state, the side of the lubricating grease away from the thermal bimetallic strips is close to or flush with the edge of the groove notch.

[0011] In one or more embodiments of the present application, the dynamic conductive rod for the vacuum arc chamber also includes a plurality of connecting parts, which correspond to the thermal bimetal strips one by one. A connecting part is provided between each thermal bimetal strip and the corresponding grease, and the two ends of the connecting part are respectively connected to the thermal bimetal strip and the grease.

[0012] In one or more embodiments of the present application, each of the connecting parts includes a disk body and a plurality of extension portions arranged circumferentially along the disk body, the extension portion extends a predetermined distance away from the thermal bimetal strip and penetrates into the grease, and the side of the disk body away from the extension portion is connected to the thermal bimetal strip.

[0013] In one or more embodiments of the present application, each of the connecting parts further includes a positioning portion, the positioning portion is located on the side of the disk body away from the thermal bimetallic strip, and the positioning portion is located at the center of the disk body, and the positioning portion penetrates into the grease.

[0014] In one or more embodiments of the present application, the middle section of the rod body has a supporting portion.

[0015] In one or more embodiments of the present application, a second annular groove is provided on a side of the abutting portion close to the first annular groove.

[0016] In one or more embodiments of the present application, an outer edge of the abutting portion has a welding notch.

[0017] In one or more embodiments of the present application, both ends of the rod body have a connecting hole.

[0018] In an embodiment of the present application, a dynamic conductive rod for a vacuum interrupter includes a rod body, a plurality of thermal bimetallic strips and a plurality of greases. A side wall at one end of the rod body has a plurality of grooves and a plurality of first annular grooves. A thermal bimetallic strip is arranged in each groove. The active layer of the thermal bimetallic strip faces the notch of the groove. A grease is connected to the active layer of each thermal bimetallic strip. When the thermal bimetallic strip is in an undeformed state, the side of the grease facing away from the thermal bimetallic strip is close to or flush with the edge of the notch of the groove. When the temperature of the rod body is high, the thermal bimetallic strip is deformed and the grease is pushed out of the notch of the groove and fully lubricated with the inner wall of the external guide sleeve. Compared with the prior art, it has the advantages of effectively reducing the wear of the sealing ring and helping to extend the overall life of the vacuum interrupter. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] These and / or other aspects and advantages of the present application will become clearer and easier to understand from the following detailed description of the embodiments of the present application in conjunction with the accompanying drawings, in which:

[0020] Figure 1The figure shows a schematic diagram of a structure in which a movable conductive rod is installed in a vacuum interrupter;

[0021] Figure 2 The figure shows a schematic diagram of the structure of a movable conductive rod for a vacuum interrupter chamber installed in the vacuum interrupter chamber of the utility model;

[0022] Figure 3 Picture shows Figure 2 A local enlarged view of point C;

[0023] Figure 4 Picture shows Figure 2 A local enlarged view of D;

[0024] Figure 5 The figure shows a schematic diagram of a cross-sectional structure of a rod body having a groove;

[0025] Figure 6 The figure shows a schematic structural diagram when the extension portion of the connecting member is not bent. DETAILED DESCRIPTION

[0026] The terms and words used in the following specification and claims are not limited to the literal meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present application. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of the present application is provided for illustrative purposes only and not for the purpose of limiting the present application as defined by the appended claims and their equivalents.

[0027] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0028] Although ordinals such as "first," "second," and the like will be used to describe various components, those components are not limited herein. The term is used only to distinguish one component from another. For example, a first component may be referred to as a second component, and likewise, a second component may be referred to as a first component without departing from the teachings of the utility model concept. The term "and / or" as used herein includes any and all combinations of one or more associated listed items.

[0029] The terms used herein are only used for the purpose of describing various embodiments and are not intended to be limiting. As used herein, singular forms are intended to also include plural forms, unless the context clearly indicates an exception. In addition, it will be understood that the terms "including" and / or "having" when used in this specification specify the presence of the described features, numbers, steps, operations, components, elements or combinations thereof, without excluding the presence or addition of one or more other features, numbers, steps, operations, components, elements or groups thereof.

[0030] Schematic diagram of a vacuum interrupter with a moving conductive rod.

[0031] refer to Figures 2 to 6 According to a preferred embodiment of the utility model, a dynamic conductive rod for a vacuum interrupter is slidably arranged on the vacuum interrupter. The vacuum interrupter also includes a ceramic shell 90, a dynamic end cover 91, a static end cover (not shown in the figure), a guide sleeve 92, a bellows 93, a static conductive rod 94 and a protective cover 97. The ceramic shell 90 has a vacuum chamber 901, and the two ends of the vacuum chamber 901 are connected. The dynamic end cover 91 and the static end cover are respectively arranged at the two ends of the vacuum chamber 901 and close the two ends of the vacuum chamber 901. The guide sleeve 92 includes a cylindrical protruding portion 921 and an abutting portion 922, and the abutting portion 922 and the dynamic end cover are connected. 91 abuts, the cylindrical extension 921 passes through the moving end cover 91 and extends into the vacuum chamber 901 for a predetermined distance, the moving conductive rod for the vacuum arc extinguishing chamber includes a rod body 10, one end of the rod body 10 passes through the guide sleeve 92 and extends into the vacuum chamber 901 and abuts against or separates from the static conductive rod 94, the middle section of the rod body 10 has an abutment portion 101, one end of the protective cover 97 abuts against and is welded to the abutment portion 101, the end of the protective cover 97 facing away from the abutment portion 101 is wrapped around the outside of the bellows 93, and the two ends of the bellows 93 are respectively connected to the moving end cover 91 and the protective cover 97.

[0032] It should be noted that the protective cover 97 is intended to prevent the metal vapor generated when the moving conductive rod of the vacuum arc chamber is separated from the static conductive rod 94 from splashing onto the bellows 93 and reducing the service life of the bellows 93. By providing the abutment portion 101, conditions are provided for positioning the protective cover 97 and achieving the connection between the protective cover 97 and the rod body 10.

[0033] It should also be noted that when the two ends of the bellows 93 are connected and sealed, outside air still flows in from the gap between the side wall of the rod body 10 and the inner hole wall of the guide sleeve 92, and flows out from the gap at the abutment between the abutment portion 101 and the protective cover 97, enters the vacuum chamber 901, and reduces the vacuum degree of the vacuum chamber 901.

[0034] In view of this, in the embodiments of the present application, Figures 2 to 4 As shown, a side wall at one end of the rod body 10 has a plurality of first annular grooves 102 , and a side of the abutting portion 101 close to the first annular groove 102 has a second annular groove 1011 .

[0035] It should be noted that sealing rings are provided in both the first annular groove 102 and the second annular groove 1011. The sealing ring placed in the first annular groove 102 fits against the inner hole wall of the guide sleeve 92. In addition, when the protective cover 97 is connected to the abutment portion 101, the sealing ring placed in the second annular groove 1011 is deformed under pressure and fills the second annular groove 1011. By setting the first annular groove 102 and the second annular groove 1011, when the sealing rings in the first annular groove 102 and the second annular groove 1011 are damaged, the outside air can penetrate into the vacuum chamber 901 along the above-mentioned path.

[0036] However, since the rod body 10 is slidably arranged on the guide sleeve 92, and in the energized state, when the movable conductive rod for the vacuum interrupter is separated from the static conductive rod 94, a high-temperature vacuum arc will be generated between the movable conductive rod for the vacuum interrupter and the static conductive rod 94. If only a layer of lubricating liquid is applied to the outer side of the rod body 10 during installation, this part of the lubricating liquid will be easily consumed under the influence of high temperature and frequent relative friction after long-term use. Subsequently, when the rod body 10 approaches or moves away from the static conductive rod 94, the rod body 10 is placed in the vacuum interrupter. The sealing ring of the first annular groove 102 is easy to wear. At this time, the outside air can easily penetrate into the cavity between the rod body 10 and the inner hole wall of the bellows 93 from the gap between the rod body 10 and the inner hole wall of the guide sleeve 92. If the sealing performance at both ends of the bellows 93 or the sealing performance of the second annular groove 1011 deteriorates, the outside air that penetrates into the cavity between the rod body 10 and the inner hole wall of the bellows 93 will flow into the vacuum chamber 901 and will reduce the vacuum degree of the vacuum chamber 901, thereby reducing the arc extinguishing performance and service life of the vacuum arc extinguishing chamber.

[0037] In view of this, in the embodiments of the present application, Figure 3 As shown, the rod body 10 has a side wall at one end of the first annular groove 102 and also has a plurality of grooves 103 , and the dynamic conductive rod for the vacuum interrupter also includes a plurality of thermal bimetallic strips 20 and a plurality of greases 30 .

[0038] Specifically, Figure 3 and Figure 5As shown, a thermal bimetal 20 is provided in each of the grooves 103, and the groove 103 is L-shaped. One end of the thermal bimetal 20 is fixedly connected to the groove wall of the groove 103, and its fixed connection method includes but is not limited to welding. The active layer of the thermal bimetal 20 faces the notch of the groove 103, and the grease 30 corresponds to the thermal bimetal 20 one by one. The active layer of each thermal bimetal 20 is connected with a grease 30. When the thermal bimetal 20 is in an undeformed state, the side of the grease 30 facing away from the thermal bimetal 20 is close to or flush with the edge of the notch of the groove 103.

[0039] It should be noted that, under normal conditions, the thermal bimetal 20 is in an undeformed state, at which time the grease 30 and the inner hole wall of the guide sleeve 92 are in a pressure-free fit or spaced a predetermined distance apart, thereby reducing the loss of the grease 30. When the moving conductive rod of the vacuum interrupter is separated from the static conductive rod 94, the high temperature of the vacuum arc is transmitted to the rod body 10, and the friction heat generated when the rod body 10 and the guide sleeve 92 slide relative to each other. When the sum of these two parts of heat exceeds a predetermined value, the active layer of the thermal bimetal 20 is deformed under the action of high temperature and bends a predetermined distance toward the notch direction of the groove 103. Since the grease 30 is installed on the active layer of the thermal bimetal 20, the grease 30 extends out of the notch by a predetermined distance and tightly abuts against the inner hole wall of the guide sleeve 92. When the rod body 10 slides further, lubrication is applied to the inner hole wall of the guide sleeve 92, thereby reducing the wear of the sealing ring provided in the first annular groove 102. Obviously, compared with the prior art, the embodiment of the present application has the advantage of being able to effectively reduce the wear of the sealing ring and help extend the overall life of the vacuum arc chamber.

[0040] Further, in order to realize the connection between the thermal bimetallic strip 20 and the grease 30, as Figure 3 and Figure 5 As shown, the dynamic conductive rod for the vacuum interrupter also includes a plurality of connectors 40, and the connectors 40 correspond to the thermal bimetallic strips 20 one by one. A connector 40 is provided between each thermal bimetallic strip 20 and the corresponding grease 30, and the two ends of the connector 40 are respectively connected to the thermal bimetallic strip 20 and the grease 30.

[0041] More specifically, if Figure 3 , Figure 5 and Figure 6As shown, each of the connecting members 40 includes a disk body portion 401 and a plurality of extension portions 402 arranged circumferentially along the disk body portion 401, the extension portion 402 is bent at a predetermined angle in a direction away from the thermal bimetal 20 and penetrates into the grease 30. In the embodiment of the present application, the extension portion 402 is bent twice by 90°, so that the end of the extension portion 402 penetrates into the grease 30, and the middle section of the extension portion 402 is in contact with the bottom side wall of the grease 30; in addition, the side of the disk body portion 401 away from the extension portion 402 is connected to the thermal bimetal 20, and the connection method includes but is not limited to bonding.

[0042] Furthermore, in order to prevent the lubricating grease 30 from moving relative to the plate body 401 when the extension 402 penetrates the lubricating grease 30, Figure 3 , Figure 5 and Figure 6 As shown, each of the connecting members 40 further includes a positioning portion 403 , which is located on the side of the disk body 401 away from the thermal bimetallic strip 20 , and is located at the center of the disk body 401 , and penetrates into the grease 30 .

[0043] Furthermore, in order to allow more solder to fill the connection between the abutment portion 101 and the protective cover 97, as shown in FIG. Figure 4 As shown, the outer edge of the abutting portion 101 has a welding notch 1012 .

[0044] Furthermore, in order to realize that the two ends of the rod body 10 are connected to the external actuator and the contact seat respectively, as Figure 2 As shown, both ends of the rod body 10 have a connecting hole 104, and the connecting hole 104 is a threaded hole.

[0045] In summary, the movable conductive rod for the vacuum arc chamber based on the embodiment of the present application is explained, which provides the movable conductive rod for the vacuum arc chamber with advantages such as being able to effectively reduce the wear of the sealing ring and helping to extend the overall life of the vacuum arc chamber.

[0046] It is worth mentioning that in the embodiment of the present application, the movable conductive rod for the vacuum interrupter has a simple structure, does not involve complex manufacturing processes and expensive materials, and has high economic efficiency. At the same time, for manufacturers, the movable conductive rod for the vacuum interrupter provided by the present application is easy to produce and has low cost, which is more conducive to controlling production costs and further conducive to product promotion and use.

[0047] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A movable conductive rod for a vacuum interrupter, slidably arranged on the vacuum interrupter, characterized in that: The movable conductive rod for the vacuum interrupter comprises A rod body, wherein a side wall at one end of the rod body has a plurality of grooves and a plurality of first annular grooves; and A plurality of thermal bimetallic strips, each of the grooves is provided with a thermal bimetallic strip, and the active layer of the thermal bimetallic strip faces the notch of the groove; and A plurality of lubricating greases, each of which corresponds to the thermal bimetallic strips one by one, and each active layer of the thermal bimetallic strips is connected with a lubricating grease, and when the thermal bimetallic strips are in an undeformed state, the side of the lubricating grease away from the thermal bimetallic strips is close to or flush with the edge of the groove notch.

2. The movable conductive rod for vacuum interrupter according to claim 1, characterized in that: The dynamic conductive rod for the vacuum interrupter also includes a plurality of connectors, which correspond to the thermal bimetallic strips one by one. A connector is provided between each thermal bimetallic strip and the corresponding grease, and both ends of the connector are respectively connected to the thermal bimetallic strip and the grease.

3. The movable conductive rod for vacuum interrupter according to claim 2, characterized in that: Each of the connecting parts includes a disc body and a plurality of extensions arranged circumferentially along the disc body, wherein the extensions extend a predetermined distance away from the thermal bimetallic strip and penetrate into the grease, and the side of the disc body away from the extensions is connected to the thermal bimetallic strip.

4. The movable conductive rod for vacuum interrupter according to claim 3, characterized in that: Each of the connecting parts further comprises a positioning portion, which is located on a side of the disk body away from the thermal bimetallic strip and is located at the center of the disk body, and the positioning portion penetrates into the grease.

5. The movable conductive rod for a vacuum interrupter according to any one of claims 1 to 4, characterized in that: The middle section of the rod body has a supporting portion.

6. The movable conductive rod for vacuum interrupter according to claim 5, characterized in that: The abutting portion has a second annular groove on one side thereof close to the first annular groove.

7. The movable conductive rod for vacuum interrupter according to claim 6, characterized in that: The outer edge of the abutting portion has a welding notch.

8. The movable conductive rod for vacuum interrupter according to claim 7, characterized in that: Both ends of the rod body are provided with a connecting hole.

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