Connecting structure and solid-sealed polar pole

Abstract

The utility model provides a connecting structure and a solid-sealed polar pole, and relates to the technical field of power distribution networks. The connection structure comprises a vacuum arc-extinguishing chamber and a moving terminal. The vacuum arc-extinguishing chamber is provided with a movable end, the movable terminal sleeves the movable end, and the movable terminal is in threaded fit with the movable end; the side wall of the moving terminal is provided with a through groove, and the moving terminal is provided with a locking member which is used for closing the through groove. A spring contact finger is arranged in a bottom groove formed in the outgoing line terminal, and the spring contact finger keeps elastic deformation between the moving terminal and the outgoing line terminal through elasticity of the spring contact finger so as to provide effective pressure contact connection. When the connecting structure is assembled, the movable terminal is screwed, and the movable terminal is in threaded connection and fixation with the movable end of the vacuum arc-extinguishing chamber. Afterwards, the through grooves are closed together by using the locking member, so that the internal thread of the moving terminal and the external thread of the moving terminal are locked in the axial vertical direction, the effective contact area of the threads can be multiplied, larger current can be allowed to pass through, and the requirements of products with larger current levels can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of power distribution networks, in particular to a connection structure and a sealed pole. Background Art

[0002] In existing distribution networks, the sealed poles used in outdoor circuit breakers (or reclosers) are limited by the connection method between the internal vacuum interrupter and other components. The rated current is mostly 630A and 800A, which cannot meet the needs of products with higher current levels. Utility Model Content

[0003] In order to solve the problems existing in the prior art, one of the purposes of the present invention is to provide a connection structure.

[0004] The utility model provides the following technical solutions:

[0005] A connection structure includes a vacuum interrupter and a movable terminal;

[0006] The vacuum interrupter has a movable end, the movable terminal is sleeved on the movable end, and the movable terminal is threadedly engaged with the movable end;

[0007] A through slot is provided on the side wall of the movable terminal, and a locking piece is provided on the movable terminal. The locking piece is used to close the through slots.

[0008] As a further optional solution to the connection structure, the locking member includes a locking bolt and a locking nut, the locking bolt is provided along the first direction through the movable terminal and passes through the through slot, and the locking nut is threadedly engaged with the locking bolt;

[0009] Wherein, the first direction is perpendicular to the axial direction of the movable terminal.

[0010] As a further optional solution to the connection structure, the movable terminal has two locking parts, the two locking parts are respectively located on both sides of the through slot, and the locking bolt is passed through the two locking parts.

[0011] As a further optional solution to the connection structure, the connection structure further includes an outlet terminal, the outlet terminal having a cylindrical connection portion, and a spring contact finger embedded in an inner wall groove of the connection portion;

[0012] The movable terminal is slidably arranged in the connecting portion, and the outer wall of the movable terminal abuts against the spring contact finger.

[0013] As a further optional solution to the connection structure, an avoidance groove is provided on the inner wall of the connection part, the locking part is located inside the avoidance groove, and the maximum distance between the side wall of the avoidance groove and the locking part is greater than the movement stroke of the movable terminal.

[0014] As a further optional solution to the connection structure, the locking member further includes a first spring washer, the first spring washer is sleeved on the locking bolt, and the locking nut is abutted against the movable terminal through the first spring washer.

[0015] As a further optional solution to the connection structure, the connection structure further includes an incoming line terminal, the vacuum interrupter has a static end, and the static end is connected to the incoming line terminal.

[0016] As a further optional solution to the connection structure, a fastening screw is provided on the incoming terminal, and the fastening screw is engaged with the static end thread.

[0017] As a further optional solution to the connection structure, a second spring washer is sleeved on the fastening screw, and the head of the fastening screw is abutted against the incoming terminal through the second spring washer.

[0018] Another object of the present invention is to provide a sealed pole.

[0019] The utility model provides the following technical solutions:

[0020] A sealed pole comprises the above-mentioned connection structure.

[0021] The embodiments of the present utility model have the following beneficial effects:

[0022] In the related art, the current carrying capacity of the sealed pole with a rated current of 630A or 800A can be met by connecting the end face of a conductive rod with a diameter of Φ24 or more. When the current carrying level needs to be increased, due to the higher electrical requirements, volume requirements and cost requirements of the vacuum interrupter, it is often considered to make the vacuum interrupter into a threaded structure rather than using a conductive rod with a larger outer diameter. However, when the vacuum interrupter is connected to other components by means of threads, it is necessary to rely on the gap between the vacuum interrupter and other components for rotational connection, which can only achieve a tangential connection, a small contact area, and still limited current carrying capacity. Because the threaded connection is a tangential connection, in the subsequent vibration and extrusion process, there will often be problems in the connection due to the plastic deformation of the components, such as reduced resistance, loose pull rods, etc., which may cause the outdoor switch to explode in severe cases.

[0023] In contrast, when assembling the above-mentioned connection structure, the movable terminal is screwed into place, threadedly connecting it to the movable end of the vacuum interrupter. Subsequently, a locking member is used to bring the through-slots together, thereby axially and perpendicularly locking the internal threads of the movable terminal and the external threads of the movable end. This effectively increases the effective contact area of the threads, allowing for greater current flow and meeting the needs of products with higher current ratings.

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 The figure shows an overall structural diagram of a connection structure provided by an embodiment of the present utility model;

[0027] Figure 2 Shown Figure 1 Schematic diagram of the AA section;

[0028] Figure 3 The figure shows an overall structural diagram of a connection structure provided by another embodiment of the present utility model;

[0029] Figure 4 A schematic diagram showing the connection relationship between a movable terminal and a connecting portion in a connection structure provided by an embodiment of the present utility model is shown;

[0030] Figure 5 A schematic diagram of the connection relationship between the incoming terminal and the static end in a connection structure provided by an embodiment of the present utility model is shown.

[0031] Description of main component symbols:

[0032] 100-vacuum interrupter; 110-moving end; 120-static end; 200-moving terminal; 210-through slot; 220-locking piece; 221-locking bolt; 222-locking nut; 223-first spring washer; 230-locking part; 300-outgoing terminal; 310-connecting part; 311-avoidance groove; 320-spring contact finger; 400-incoming terminal; 410-fastening screw; 420-second spring washer. DETAILED DESCRIPTION

[0033] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. Conversely, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0035] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the template description herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] Example

[0039] Please also refer to Figure 1 and Figure 2 This embodiment provides a connection structure, specifically a connection structure suitable for outdoor high-current reclosers or circuit breakers, and the connection structure includes a vacuum interrupter 100 and a moving terminal 200.

[0040] The vacuum interrupter 100 has a movable end 110 . The movable terminal 200 is sleeved on the movable end 110 , and the movable terminal 200 and the movable end 110 are threadedly engaged.

[0041] In addition, a through slot 210 is provided on the side wall of the movable terminal 200 , and a locking member 220 is provided on the movable terminal 200 . The locking member 220 is used to close the through slots 210 .

[0042] In the related art, the current carrying capacity of the sealed pole with a rated current of 630A or 800A can be met by connecting the end face of a conductive rod with a diameter of Φ24 or more. When the current carrying level needs to be increased, due to the higher electrical requirements, volume requirements and cost requirements of the vacuum interrupter 100, it is often considered to make the vacuum interrupter 100 into a threaded structure rather than using a conductive rod with a larger outer diameter. However, when the vacuum interrupter 100 is connected to other components by means of threads, it is necessary to rely on the gap between the vacuum interrupter 100 and other components for rotational connection, which can only achieve a tangential connection, a small contact area, and still limited current carrying capacity. Because the threaded connection is a tangential connection, in the subsequent vibration and extrusion process, there will often be problems in the connection due to the plastic deformation of the components, such as reduced resistance, loose pull rods, etc., which may cause the outdoor switch to explode in severe cases.

[0043] In contrast, when assembling the above-described connection structure, the movable terminal 200 is screwed and fixedly connected to the movable end 110 of the vacuum interrupter 100. Subsequently, the through-slot 210 is brought together using the locking member 220, thereby axially and perpendicularly locking the internal thread of the movable terminal 200 and the external thread of the movable end 110. This multiplies the effective contact area of the threads, allowing for greater current to flow, meeting the requirements of products with higher current ratings (e.g., 1000A, 1250A, or even higher).

[0044] Specifically, the through slot 210 extends along the axial direction of the movable terminal 200 , which is indicated by the Y direction in the figure.

[0045] In some embodiments, the locking member 220 includes a locking bolt 221 and a locking nut 222. The locking bolt 221 is disposed along the first direction through the movable terminal 200 and passes through the through slot 210. The locking nut 222 is threadedly engaged with the locking bolt 221.

[0046] The first direction is perpendicular to the axis direction of the movable terminal 200 , and is indicated by the X direction in the figure.

[0047] After the movable terminal 200 is threadedly connected and fixed with the movable end 110, the locking nut 222 is screwed in so that the locking nut 222 abuts against the area on one side of the through slot 210 of the movable terminal 200, and the head of the locking bolt 221 abuts against the area on the other side of the through slot 210 of the movable terminal 200, thereby bringing the through slot 210 closer together, thereby increasing the effective contact area between the movable terminal 200 and the movable end 110.

[0048] Furthermore, the locking member 220 further includes a first spring washer 223. The first spring washer 223 is sleeved on the locking bolt 221, and the locking nut 222 is held against the movable terminal 200 via the first spring washer 223.

[0049] During the process of screwing the locking nut 222 in, the first spring washer 223 is squeezed and deformed by the locking nut 222. After assembly, the reaction force exerted by the first spring washer 223 on the locking nut 222 causes the internal threads of the locking nut 222 to abut against the external threads of the locking bolt 221. The friction between the internal threads of the locking nut 222 and the external threads of the locking bolt 221 locks the locking nut 222, preventing the locking nut 222 from loosening.

[0050] In some embodiments, the movable terminal 200 has two locking portions 230 , which are respectively located on either side of the through slot 210 . Accordingly, the locking bolts 221 are passed through the two locking portions 230 .

[0051] When the locking nut 222 is screwed in, the locking nut 222 is abutted against the locking portion 230 located on one side of the through slot 210 through the first spring washer 223, and the head of the locking bolt 221 is abutted against the locking portion 230 located on the other side of the through slot 210, so that the two locking portions 230 are brought closer to each other, thereby closing the through slots 210.

[0052] Please also refer to Figure 3 and Figure 4 In some embodiments, the connection structure further includes an outlet terminal 300 having a cylindrical connecting portion 310. The axial direction of the connecting portion 310 is parallel to the Y direction, and a spring contact finger 320 is embedded in the inner wall groove of the connecting portion 310.

[0053] Correspondingly, the movable terminal 200 is slidably inserted into the connecting portion 310 , and the outer wall of the movable terminal 200 abuts against the spring contact finger 320 .

[0054] During use, the spring contact fingers 320 are always in a compressed and deformed state. During movement, the movable terminal 200 is tightly connected to the outlet terminal 300 via the spring contact fingers 320, maintaining contact and continuity, ensuring a reliable connection and unaffecting the movement of the movable terminal 200. Furthermore, the coordination between the movable terminal 200, the spring contact fingers 320, and the connecting portion 310 also serves to guide the movable terminal 200.

[0055] Furthermore, an escape groove 311 is provided on the inner wall of the connecting portion 310 . The locking portion 230 is located inside the escape groove 311 , and the maximum distance between the sidewall of the escape groove 311 and the locking portion 230 is greater than the movement stroke of the movable terminal 200 .

[0056] In other words, along the Y direction, the movement gap between the locking part 230 and the connecting part 310 is greater than the movement opening distance of the product, which can not only ensure the effective connection of the above-mentioned connection structure, but also ensure that the movement of the movable terminal 200 does not interfere, and can also make the movable terminal 200 move in a directional manner along its own axial direction.

[0057] Specifically, the avoidance groove 311 is provided at the upper portion of the inner wall of the connecting portion 310 , and the spring contact finger 320 is embedded in the lower portion of the inner wall of the connecting portion 310 .

[0058] See also Figure 3 In some embodiments, the connection structure further includes an incoming line terminal 400. Accordingly, the vacuum interrupter 100 has a static end 120, which is connected to the incoming line terminal 400.

[0059] by Figure 3 Taking the perspective shown as an example, the static terminal 120 is located at the top of the vacuum interrupter 100, and the dynamic terminal 110 is located at the bottom of the vacuum interrupter 100. The incoming terminal 400, vacuum interrupter 100, and dynamic terminal 200 are arranged in order from top to bottom. Furthermore, the outgoing terminal 300 is arranged horizontally, with one horizontal end of the outgoing terminal 300 being a connecting portion 310, which is connected to the dynamic terminal 200.

[0060] In the related art, for a sealed pole with a rated current of 630A or 800A, external threads are directly machined on the incoming terminal 400 because the incoming terminal 400 and the vacuum interrupter 100 are on the same core, and the upper end face of the vacuum interrupter 100 is relatively small. However, the incoming terminal 400 is made of copper, so during installation, the conductive surfaces of the vacuum interrupter 100 and the incoming terminal 400 can only be installed with a torque of 3.6 or even less. This often results in thread breakage and insufficient contact pressure on the lap joints. During the subsequent assembly process, production process, high and low temperature environments, and vibration, insufficient lap joint pressure and detachment are likely to occur, resulting in poor product contact and excessive resistance. In severe cases, it can cause the circuit breaker or recloser switch to explode.

[0061] See also Figure 5 In order to solve this problem, in some embodiments, a fastening screw 410 is provided on the incoming terminal 400 , and the fastening screw 410 is threadedly engaged with the static end 120 .

[0062] At this time, the incoming terminal 400 is in direct contact and conduction with the static end 120, and is also in contact and conduction with the static end 120 through the fastening screw 410, which can allow a larger current to pass through, thereby meeting the needs of products with higher current levels.

[0063] Furthermore, a second spring washer 420 is sleeved on the fastening screw 410 , and the head of the fastening screw 410 is abutted against the incoming terminal 400 through the second spring washer 420 .

[0064] During assembly, the fastening screw 410 is passed through the second spring washer 420 and the incoming terminal 400 in sequence. Then, using a torque wrench extension, the external thread of the fastening screw 410 is locked into the internal thread of the vacuum interrupter 100 and tightened with the torque wrench. A silicone plug or metal insert is then inserted into the incoming terminal 400 to prevent material leakage during the subsequent casting process.

[0065] It can be understood that the fastening screw 410 adopts a standard screw, and its locking force can reach level 8.8. After the pre-tightening force of the second spring washer 420, the connection reliability between the incoming terminal 400 and the static end 120 is greatly improved, which fundamentally solves the risks of small current products and can be applied to torque and pressure with a larger contact area.

[0066] In summary, the above-mentioned connection structure is achieved by providing a through groove 210 on the moving terminal 200. After the moving terminal 200 is threadedly connected and fixed with the moving end 110 of the vacuum interrupter 100, the through groove 210 is brought together using the locking member 220, thereby locking the internal thread of the moving terminal 200 and the external thread of the moving end 110 in the axial vertical direction. This can increase the effective contact area of the thread exponentially, allowing a larger current to pass through, and meeting the needs of products with larger current levels (such as 1000A, 1250A or higher).

[0067] This embodiment further provides a sealed pole, which is applied to outdoor switches such as reclosers or circuit breakers. The sealed pole includes the above-mentioned connection structure.

[0068] In all examples shown and described herein, any specific values should be interpreted as merely exemplary and not limiting, and thus other examples of the exemplary embodiments may have different values.

[0069] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0070] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A connection structure, characterized in that: Including vacuum interrupter and moving terminal; The vacuum interrupter has a movable end, the movable terminal is sleeved on the movable end, and the movable terminal is threadedly engaged with the movable end; A through slot is provided on the side wall of the movable terminal, and a locking piece is provided on the movable terminal. The locking piece is used to close the through slots.

2. The connection structure according to claim 1, characterized in that: The locking member includes a locking bolt and a locking nut, wherein the locking bolt is provided through the movable terminal along a first direction and passes through the through slot, and the locking nut is threadably engaged with the locking bolt; Wherein, the first direction is perpendicular to the axial direction of the movable terminal.

3. The connection structure according to claim 2, characterized in that: The movable terminal has two locking parts, the two locking parts are respectively located on both sides of the through slot, and the locking bolt is passed through the two locking parts.

4. The connection structure according to claim 3, characterized in that: The connection structure further comprises an outlet terminal, the outlet terminal having a cylindrical connecting portion, wherein a spring contact finger is embedded in an inner wall groove of the connecting portion; The movable terminal is slidably arranged in the connecting portion, and the outer wall of the movable terminal abuts against the spring contact finger.

5. The connection structure according to claim 4, characterized in that: An escape groove is provided on the inner wall of the connecting portion, the locking portion is located inside the escape groove, and the maximum distance between the side wall of the escape groove and the locking portion is greater than the movement stroke of the movable terminal.

6. The connection structure according to any one of claims 2 to 5, characterized in that: The locking member further includes a first spring washer, which is sleeved on the locking bolt, and the locking nut is held against the movable terminal via the first spring washer.

7. The connection structure according to claim 1, characterized in that: The connection structure further includes an incoming line terminal, and the vacuum interrupter has a static end, which is connected to the incoming line terminal.

8. The connection structure according to claim 7, characterized in that: A fastening screw is provided on the incoming terminal, and the fastening screw is matched with the static end thread.

9. The connection structure according to claim 8, characterized in that: A second spring washer is sleeved on the fastening screw, and the head of the fastening screw is abutted against the incoming terminal through the second spring washer.

10. A sealed pole, characterized in that: The invention comprises the connection structure according to any one of claims 1 to 9.

Images