Shielding cylinder fixing structure of vacuum arc-extinguishing chamber

Abstract

The utility model relates to the technical field of vacuum arc extinguish chambers, in particular to a vacuum arc extinguish chamber shielding cylinder fixing structure which comprises a shell and a shielding cylinder, the shell is provided with a vacuum cavity, the cavity wall of the vacuum cavity is provided with clamping and embedding protrusions, and the shielding cylinder is arranged in the vacuum cavity. The side wall of the shielding cylinder is provided with a plurality of convex hulls which are matched with the clamping and embedding protrusions and limit the shielding cylinder to move up and down, the shielding cylinder and the ceramic shell are fixed through matching of the convex hulls and the clamping and embedding protrusions, and the advantages that silver and copper fiber materials are not needed, the shielding cylinder and the ceramic shell are firmly fixed, and the manufacturing cost is lower are achieved.

Description

Technical Field

[0001] This application relates to the field of vacuum interrupter technology, and more specifically to a vacuum interrupter shielding cylinder fixing structure. Background Technology

[0002] Vacuum interrupters are core components of medium- and high-voltage power switches. Through the excellent insulation provided by the vacuum inside the tube, they enable rapid arc extinguishing and current suppression after power is cut off in medium- and high-voltage circuits, preventing accidents and incidents. They are primarily used in power transmission and distribution control systems. A vacuum interrupter consists of a ceramic shell and a shielding cylinder. The shielding cylinder prevents the high-temperature metal vapor generated when the moving and stationary guide rods break from splashing and damaging the insulation of the ceramic shell. The shielding cylinder must be fixedly installed on the ceramic shell.

[0003] There is a vacuum interrupter shielding cylinder fixing structure, such as Figure 1 As shown, the device includes a ceramic shell 90, a silver-copper fiber 91, and a shielding cylinder 92. The ceramic shell 90 has a vacuum cavity 901, and the cavity wall of the vacuum cavity 901 has a first annular protrusion 9011. The outer wall of the shielding cylinder 92 has a second annular protrusion 921, which is located above the first annular protrusion 9011. The silver-copper fiber 91 is located between the first annular protrusion 9011 and the second annular protrusion 921, and the first annular protrusion 9011 and the second annular protrusion 921 are welded together by the silver-copper fiber 91. However, in order to ensure that the ceramic shell 90 and the shielding cylinder 92 can be firmly connected, the silver-copper fiber 91 is mostly annular, and a large amount of silver-copper fiber 91 is used, resulting in high manufacturing costs.

[0004] Therefore, there is a need for an embossed cork paper that does not require silver or copper fiber materials, has a secure connection between the shielding tube and the ceramic shell, and has a lower manufacturing cost. Summary of the Invention

[0005] The main objective of this application is to provide a fixing structure for a vacuum interrupter shielding cylinder. The fixing structure includes an outer shell and a shielding cylinder. The outer shell has a vacuum cavity, and the cavity wall of the vacuum cavity has locking protrusions. The shielding cylinder is placed inside the vacuum cavity. The side wall of the shielding cylinder has several protrusions that cooperate with the locking protrusions and restrict the vertical movement of the shielding cylinder. The fixing of the shielding cylinder to the ceramic outer shell is achieved through the cooperation of the protrusions and locking protrusions. Compared with the prior art, this method has the advantages of eliminating the need for silver-copper fiber materials, ensuring a secure fixation between the shielding cylinder and the ceramic outer shell, and lower manufacturing costs.

[0006] Another object of the present application is to provide a vacuum interrupter shield cylinder fixing structure, wherein the shield cylinder has two groups of the protrusions, one group of the protrusions is a positioning protrusion, and the other group of the protrusions is a rear-formed protrusion, and the positioning protrusion and the rear-formed protrusion are respectively located at two ends of the snap-in protrusion.

[0007] Another object of the present application is to provide a vacuum interrupter shield cylinder fixing structure, wherein the shield cylinder has two groups of the protrusions, and both groups of the protrusions are rear-formed protrusions, and when the shield cylinder passes through the snap-in protrusion, both groups of the rear-formed protrusions are expanded outward from the inner wall of the shield cylinder and respectively abut against two ends of the snap-in protrusion.

[0008] Another object of the present application is to provide a vacuum interrupter shield cylinder fixing structure, wherein the middle section of the snap-in protrusion has a groove, the shield cylinder has one group of the protrusions, and the protrusion is a rear-formed protrusion, and when the shield cylinder passes through the snap-in protrusion, one group of the rear-formed protrusions is expanded outward from the inner wall of the shield cylinder and embedded in the groove.

[0009] To achieve the above-mentioned at least one object, the present application provides a vacuum interrupter shield cylinder fixing structure, wherein the vacuum interrupter shield cylinder fixing structure comprises:

[0010] an outer shell, the outer shell has a vacuum cavity, and the cavity wall of the vacuum cavity has a snap-in protrusion; and

[0011] a shield cylinder, the shield cylinder is arranged in the vacuum cavity, and the side wall of the shield cylinder has a plurality of protrusions which cooperate with the snap-in protrusion and limit the up-down movement of the shield cylinder.

[0012] In one or more embodiments of the present application, the shield cylinder has two groups of the protrusions, the two groups of the protrusions are spaced apart by a predetermined distance in the axial direction of the shield cylinder and respectively located at two ends of the snap-in protrusion, and the maximum radial dimension of the two protrusions is greater than the minimum passing dimension at the snap-in protrusion.

[0013] In one or more embodiments of the present application, one group of the protrusions is a positioning protrusion, and the other group of the protrusions is a rear-formed protrusion, and the positioning protrusion and the rear-formed protrusion are respectively located at two ends of the snap-in protrusion.

[0014] In one or more embodiments of the present application, two ends of the snap-in protrusion respectively have a first inclined surface and a first flat surface, when the positioning protrusion abuts against the first flat surface, the rear-formed protrusion is expanded outward from the inner wall of the shield cylinder and abuts against the first inclined surface.

[0015] In one or more embodiments of the present application, the two ends of the card-embedded protrusion each have a second plane, and when the positioning protrusion abuts against the second plane of one end of the card-embedded protrusion, the rear-formed protrusion expands outward from the inner wall of the shielding cylinder and abuts against the second plane of the other end of the card-embedded protrusion.

[0016] In one or more embodiments of the present application, the two ends of the card-embedded protrusion each have a second inclined plane and a third plane, and when the positioning protrusion abuts against the second inclined plane, the rear-formed protrusion expands outward from the inner wall of the shielding cylinder and abuts against the third plane.

[0017] In one or more embodiments of the present application, both groups of protrusions are rear-formed protrusions, and when the shielding cylinder passes through the card-embedded protrusion, both groups of rear-formed protrusions expand outward from the inner wall of the shielding cylinder and abut against the two ends of the card-embedded protrusion, respectively.

[0018] In one or more embodiments of the present application, the middle section of the card-embedded protrusion has a groove, the shielding cylinder has a group of protrusions, and the protrusions are rear-formed protrusions, and when the shielding cylinder passes through the card-embedded protrusion, a group of rear-formed protrusions expand outward from the inner wall of the shielding cylinder and are embedded in the groove.

[0019] In one or more embodiments of the present application, the shielding cylinder further has at least one auxiliary protrusion, and the auxiliary protrusion abuts against one side of the card-embedded protrusion.

[0020] In the embodiments of the present application, the shielding cylinder fixing structure of the vacuum arc-extinguishing chamber includes an outer shell and a shielding cylinder. The outer shell has a vacuum cavity, and the cavity wall of the vacuum cavity has a card-embedded protrusion. The shielding cylinder is placed in the vacuum cavity, and the side wall of the shielding cylinder has a plurality of protrusions that cooperate with the card-embedded protrusion and limit the upward and downward movement of the shielding cylinder. The fixation of the shielding cylinder and the ceramic outer shell is achieved by the cooperation of the protrusions and the card-embedded protrusion. Compared with the prior art, the shielding cylinder and the ceramic outer shell are fixed firmly, and the manufacturing cost is lower. BRIEF DESCRIPTION OF DRAWINGS

[0021] These and / or other aspects and advantages of the present application will become more apparent and more readily appreciated from the following detailed description of the embodiments of the present application, taken in conjunction with the accompanying drawings in which:

[0022] Figure 1 FIG. 1 illustrates a structural schematic diagram of a shielding cylinder fixing structure of a vacuum arc-extinguishing chamber according to the prior art;

[0023] Figure 2 FIG. 2 illustrates a structural schematic diagram of a shielding cylinder fixing structure of a vacuum arc-extinguishing chamber according to a first embodiment of the present application;

[0024] Figure 3Fig. 2 shows a structural schematic diagram of a shielding cylinder fixing structure of a vacuum interrupter according to a second embodiment of the present application;

[0025] Figure 4 Fig. 3 shows a structural schematic diagram of a shielding cylinder fixing structure of a vacuum interrupter according to a third embodiment of the present application;

[0026] Figure 5 Fig. 4 shows a structural schematic diagram of a shielding cylinder fixing structure of a vacuum interrupter according to a fourth embodiment of the present application;

[0027] Figure 6 Fig. 5 shows a structural schematic diagram of a shielding cylinder fixing structure of a vacuum interrupter according to a fifth embodiment of the present application;

[0028] Figure 7 Fig. 6 shows a structural schematic diagram of a shielding cylinder fixing structure of a vacuum interrupter according to a sixth embodiment of the present application. DETAILED DESCRIPTION

[0029] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used to enable a clear and complete understanding of the application by those skilled in the art. Accordingly, it should be apparent to those skilled in the art that the following description of various embodiments of the present application is provided for illustration purpose only and not for the purpose of limiting the application as defined by the appended claims and their equivalents.

[0030] It is understood that the term "one" is understood to mean "at least one" or "one or more", that is, in one embodiment, a number of elements can be one, while in another embodiment, the number of elements can be more than one. The term "one" is not understood to limit the number of elements to one.

[0031] Although ordinal numbers such as "first", "second", or the like will be used in describing various components, the components are not limited by the ordinal numbers. The ordinal numbers are used merely for distinguishing one component from another. For example, a first component could be termed a second component, and, similarly, a second component could be termed a first component, without departing from the teaching of the present inventive concept. The term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0032] The terms used herein are merely used to describe various embodiments and are not intended to limit the application. As used herein, the singular form is intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "has", when used in this specification, specify the presence of stated features, numbers, steps, operations, components, elements, or a combination thereof, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, elements, or groups thereof.

[0033] The schematic vacuum arc-extinguishing chamber shielding cylinder 20 fixing structure, refer to Figures 2 to 7 The vacuum arc-extinguishing chamber shielding cylinder 20 fixing structure according to any preferred embodiment of the present application comprises an outer shell 10 and a shielding cylinder 20.

[0034] Specifically, the outer shell 10 has a vacuum cavity 101, and the cavity wall of the vacuum cavity 101 has a clamping protrusion 102; in addition, the shielding cylinder 20 is placed in the vacuum cavity 101, and the side wall of the shielding cylinder 20 has a plurality of convexities that cooperate with the clamping protrusion 102 and limit the shielding cylinder 20 from moving up and down.

[0035] It should be noted that the clamping protrusion 102 can be implemented as a plurality of convexities arranged in an annular array, or as a circular annular convexity, and the specific structure of the clamping protrusion 102 is not limited herein. It can be understood that the clamping protrusion 102 is a convex structure that extends a predetermined distance from the cavity wall of the vacuum cavity 101 to the central axis of the vacuum cavity 101 and can stably support an object.

[0036] It should also be noted that the material of the outer shell 10 is preferably ceramic, and the shielding cylinder 20 is fixedly installed on the outer shell 10 by arranging convexities on both sides of the clamping protrusion 102 or by embedding the clamping protrusion 102 with convexities.

[0037] Specifically, in the first to third embodiments of the present application, the shielding cylinder 20 has two groups of convexities, and the two groups of convexities are spaced apart by a predetermined distance in the axial direction of the shielding cylinder 20 and are located at both ends of the clamping protrusion 102, respectively, and the maximum radial dimension of the two convexities is greater than the minimum passing dimension at the clamping protrusion 102.

[0038] However, if both groups of convexities are formed first, the shielding cylinder 20 will not be able to pass through the space between the clamping protrusions 102. In view of this, in the first to third embodiments of the present application, one group of convexities is a positioning convexity 201, and the other group of convexities is a rear-formed convexity 202, and the positioning convexity 201 and the rear-formed convexity 202 are located at both ends of the clamping protrusion 102, respectively.

[0039] It is pointed out that before the shielding cylinder 20 is inserted into the space between the snap-in protrusions 102, the positioning protrusions 201 have been formed, and after the shielding cylinder 20 is inserted through the predetermined distance between the snap-in protrusions 102, the positioning protrusions 201 abut against one side of the snap-in protrusions 102, at which time the shielding cylinder 20 is no longer moved; then, an inner expansion nailing device is inserted into the shielding cylinder 20 to apply an external force to the inner wall of the shielding cylinder 20, and the side wall of the shielding cylinder 20 forms a plurality of the post-formed protrusions 202 under the force, and the post-formed protrusions 202 abut against the other side of the snap-in protrusions 102, at which time the positioning protrusions 201 and the post-formed protrusions 202 abut against the snap-in protrusions 102 on both sides of the snap-in protrusions 102, so that the shielding cylinder 20 is difficult to move up and down along the central axis of the shell 10, and compared with the prior art, the shielding cylinder 20 is fixedly and firmly connected with the ceramic shell 10 without silver copper fiber material, and the manufacturing cost is lower.

[0040] More specifically, in the first embodiment of the present application, as shown in Figure 2 the two ends of the snap-in protrusions 102 respectively have a first inclined surface 1021 and a first flat surface 1022, when the positioning protrusions 201 abut against the first flat surface 1022, the post-formed protrusions 202 expand outward from the inner wall of the shielding cylinder 20 and abut against the first inclined surface 1021.

[0041] It is pointed out that in the first embodiment, one end of the positioning protrusions 201 is a flat surface, and the flat end of the positioning protrusions 201 abuts against the first flat surface 1022, when the positioning protrusions 201 abut against the first flat surface 1022, a radial force is applied to the inner wall of the shielding cylinder 20 by an inner expansion nailing device to form the post-formed protrusions 202, and the post-formed protrusions 202 abut against the first inclined surface 1021.

[0042] Figure 3 The second embodiment of the present application is illustrated, in which the two ends of the snap-in protrusions 102 respectively have a second flat surface 1023, when the positioning protrusions 201 abut against the second flat surface 1023 at one end of the snap-in protrusions 102, the post-formed protrusions 202 expand outward from the inner wall of the shielding cylinder 20 and abut against the second flat surface 1023 at the other end of the snap-in protrusions 102.

[0043] It should be noted that the second embodiment is different from the first embodiment in that the shape of the card-embedded protrusion 102 is changed, and since both sides of the card-embedded protrusion 102 are the second plane 1023, the size requirement for the height position of the nail punching by the internal expansion nail punching device is higher, and in the case that the size is not accurately controlled, that is, the rear formed convex 202 and the card-embedded protrusion 102 have a certain distance, the up-down movement space of the shielding cylinder 20 in the first embodiment is usually smaller than the up-down movement space of the shielding cylinder 20 in the second embodiment.

[0044] Figure 4 The third embodiment of the utility model is illustrated, in the third embodiment, both ends of the card-embedded protrusion 102 are respectively provided with a second inclined surface 1024 and a third plane 1025, when the positioning convex 201 abuts against the second inclined surface 1024, the rear formed convex 202 expands outward from the inner wall of the shielding cylinder 20 and abuts against the third plane 1025.

[0045] It should be noted that in the third embodiment, one side of the positioning convex 201 is an inclined surface, and the side of the positioning convex 201 that is an inclined surface has the same inclination as the second inclined surface 1024; when the shielding cylinder 20 is arranged between the card-embedded protrusions 102, the positioning convex 201 and the second inclined surface 1024 will be automatically centered under the action of gravity, which is the difference between the third embodiment and the first embodiment and the second embodiment, and then a radial force is applied to the inner wall of the shielding cylinder 20 by the internal expansion nail punching device to form the rear formed convex 202, and the rear formed convex 202 abuts against the third plane 1025.

[0046] Further, in the fourth embodiment of the present application, as shown in Figure 5 both groups of the convexes are rear formed convexes 202, when the shielding cylinder 20 passes through the card-embedded protrusions 102, both groups of the rear formed convexes 202 expand outward from the inner wall of the shielding cylinder 20 and abut against both ends of the card-embedded protrusions 102, respectively.

[0047] It should be noted that in the fourth embodiment, both ends of the card-embedded protrusion 102 are planes, the shielding cylinder 20 first passes through between the card-embedded protrusions 102, and the position of the shielding cylinder 20 is fixed by a clamping device, then a radial force is applied to the inner wall of the shielding cylinder 20 by the internal expansion nail punching device twice to form two groups of the rear formed convexes 202, and the two groups of the rear formed convexes 202 abut against both ends of the card-embedded protrusions 102, respectively.

[0048] Further, Figure 6The fifth embodiment of the utility model is illustrated, in the fifth embodiment, the middle section of the clamping protrusion 102 has a groove 1026, the shielding cylinder 20 has a group of convexes, the convexes are the rear convexes 202, when the shielding cylinder 20 passes through the clamping protrusion 102, a group of the rear convexes 202 expand from the inner wall of the shielding cylinder 20 and embed in the groove 1026.

[0049] It needs to be explained that in the fifth embodiment, the shielding cylinder 20 also needs to be fixed by a clamping device after passing through the clamping protrusion 102, then a radial force is applied to the inner wall of the shielding cylinder 20 twice by the inner expansion nail device to form a group of the rear convexes 202 and embed in the groove 1026 of the clamping protrusion 102.

[0050] Figure 7 The sixth embodiment of the utility model is illustrated, in the sixth embodiment, the rest of the structural features of the vacuum arc-extinguishing chamber shielding cylinder fixing structure are the same as the fifth embodiment, the difference lies in that the shielding cylinder 20 also has at least one auxiliary protrusion 203, the auxiliary protrusion 203 abuts against one side of the clamping protrusion 102. It needs to be explained that the auxiliary protrusion 203 plays a role in that assuming that the shell 10 is arranged vertically, when the shielding cylinder 20 is put in, even if the shielding cylinder 20 is not clamped in time, the shielding cylinder 20 will not fall freely.

[0051] In summary, the vacuum arc-extinguishing chamber shielding cylinder fixing structure based on the embodiments of the present application is illustrated, which provides the vacuum arc-extinguishing chamber shielding cylinder fixing structure with the advantages of not needing silver copper fiber material, the shielding cylinder and the ceramic shell being fixed firmly, lower manufacturing cost and the like.

[0052] It is worth mentioning that in the embodiments of the present application, the vacuum arc-extinguishing chamber shielding cylinder fixing structure is simple in structure and does not involve complex manufacturing processes and expensive materials, and has high economic efficiency. At the same time, for the manufacturers, the vacuum arc-extinguishing chamber shielding cylinder fixing structure provided by the present application is easy to produce and has low cost, which is more conducive to controlling the production cost and further conducive to product promotion and use.

[0053] Those skilled in the art should understand that the embodiments of the utility model shown in the above description and the drawings are only as examples and do not limit the utility model. The purpose of the utility model has been completely and effectively realized. The function and structural principle of the utility model have been shown and explained in the embodiments, and the embodiments of the utility model can have any deformation or modification without departing from the principle.

Claims

1. A vacuum interrupter shield cylinder fixing structure, characterized by: The vacuum interrupter shield cylinder fixing structure comprises a housing having a vacuum cavity, the cavity wall of the vacuum cavity having a clamping protrusion; and a shield cylinder arranged in the vacuum cavity, the side wall of the shield cylinder having a plurality of convexities matched with the clamping protrusion and limiting the shield cylinder from moving up and down.

2. The vacuum interrupter shield cylinder fixation structure of claim 1, wherein: The shield cylinder has two groups of the convexities, the two groups of the convexities being spaced apart by a predetermined distance along the axis of the shield cylinder and respectively located at two ends of the clamping protrusion, and the maximum radial dimension of the two groups of the convexities being greater than the minimum passing dimension at the clamping protrusion.

3. The vacuum interrupter shield cylinder fixation structure of claim 2, wherein: One group of the convexities is a positioning convexity, and the other group of the convexities is a rear-formed convexity, the positioning convexity and the rear-formed convexity being respectively located at two ends of the clamping protrusion.

4. The vacuum interrupter shield cylinder fixation structure of claim 3, wherein: The two ends of the clamping protrusion respectively have a first slope and a first plane, when the positioning convexity abuts against the first plane, the rear-formed convexity expands outward from the inner wall of the shield cylinder and abuts against the first slope.

5. The vacuum interrupter shield cylinder fixation structure of claim 3, wherein: The two ends of the clamping protrusion respectively have a second plane, when the positioning convexity abuts against the second plane at one end of the clamping protrusion, the rear-formed convexity expands outward from the inner wall of the shield cylinder and abuts against the second plane at the other end of the clamping protrusion.

6. The vacuum interrupter shield cylinder fixation structure of claim 3, wherein: The two ends of the clamping protrusion respectively have a second slope and a third plane, when the positioning convexity abuts against the second slope, the rear-formed convexity expands outward from the inner wall of the shield cylinder and abuts against the third plane.

7. The vacuum interrupter shield cylinder fixation structure of claim 2, wherein: Both groups of the convexities are rear-formed convexities, when the shield cylinder passes through the clamping protrusion, both groups of the rear-formed convexities expand outward from the inner wall of the shield cylinder and respectively abut against the two ends of the clamping protrusion.

8. The vacuum interrupter shield cylinder fixation structure of claim 1, wherein: The middle section of the clamping protrusion has a groove, the shield cylinder has a group of the convexities, the convexity being a rear-formed convexity, when the shield cylinder passes through the clamping protrusion, the group of the rear-formed convexities expands outward from the inner wall of the shield cylinder and is embedded in the groove.

9. The vacuum interrupter shield cylinder fixation structure of claim 8, wherein: The shield cylinder further has at least one auxiliary protrusion, the auxiliary protrusion abutting against one side of the clamping protrusion.

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