Non-excitation strip-shaped tap switch with linear grooved wheel structure

Abstract

The utility model provides an excitation-free bar-shaped tap switch with a linear sheave structure, which comprises an operating mechanism, a switch body and a connecting support, the operating mechanism is fixed at the top of a transformer box cover, the lower part of the operating mechanism is connected with the switch body through a main shaft, and the switch body comprises a static contact assembly and a moving contact assembly. The static contact assembly comprises a strip-shaped insulating plate and static contact sets arranged on the strip-shaped insulating plate at intervals, the lower end of the connecting support is connected with the strip-shaped insulating plate, the top of the connecting support is connected with a transformer box cover, and each static contact set is composed of a plurality of static contacts which are evenly arranged at intervals. The movable rod is movably supported by the connecting bracket, an intermittent transmission locking mechanism is arranged between the movable rod and the main shaft, and the main shaft rotates to drive the movable rod to intermittently translate, so that the movable contacts move and shift gears in a contact manner relative to the static contact groups. And an accident of moving contact displacement is prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tap changers, in particular to a no-load tap changer with linear groove wheel structure. BACKGROUND

[0002] The existing no-load tap changer adopts gear structure or screw rod structure to drive the moving contact group to move and shift gears. For example, the Chinese patent CN 205789560 U discloses a rack structure of a no-load tap changer, wherein the operating mechanism driving gear is engaged with the rack to drive the moving contact group to move and shift gears. Since the transmission error of the operating mechanism and the connection between the operating mechanism and the switch body directly affect the positioning accuracy and contact performance between the moving contact and the static contact, and the transmission between the driving gear and the rack has no locking function, the moving contact group of the tap changer will move when the operating mechanism is not locked. These factors may affect the contact performance of the tap changer, and even cause burning due to poor contact. SUMMARY

[0003] The technical problem to be solved by the utility model lies in providing a no-load tap changer with linear groove wheel structure in view of the above problems.

[0004] The embodiment of the present application is implemented as follows:

[0005] The embodiment of the present application provides a no-load tap changer with linear groove wheel structure, which comprises an operating mechanism, a switch body and a connecting bracket. The operating mechanism is fixed on the top of the transformer cover, and is connected with the switch body through a main shaft below. The switch body comprises a static contact assembly and a moving contact assembly. The static contact assembly comprises a strip-shaped insulating plate and a static contact group arranged at intervals on the strip-shaped insulating plate. The lower end of the connecting bracket is connected and fixed with the strip-shaped insulating plate, and the top of the connecting bracket is connected with the transformer cover. The static contact group is composed of a plurality of static contacts arranged at intervals. The moving contact assembly comprises a moving rod arranged on one side of the insulating plate. The moving rod is movably supported by the connecting bracket. An intermittent transmission locking mechanism is arranged between the moving rod and the main shaft. The rotation of the main shaft drives the intermittent translation of the moving rod, so that the moving contact moves and shifts gears in contact with the static contact group.

[0006] In some optional embodiments, the intermittent transmission locking mechanism comprises a wheel-type yoke connected with the main shaft and an arc-shaped locking groove arranged on the side of the moving rod. One end of the wheel-type yoke is provided with a circular arc surface matched with the arc-shaped locking groove. The other end extends radially and is provided with a shift pin with a radius greater than that of the circular arc surface. The arc-shaped locking grooves are arranged at equal intervals along the longitudinal direction of the side of the moving rod. A U-shaped shift groove matched with the shift pin is arranged between the arc-shaped locking grooves.

[0007] In some alternative implementations, the arcuate wheel surface at one end of the wheel-type shift fork is half or more than half of the arcuate wheel surface.

[0008] In some alternative implementations, one end of the wheel-type shift fork is slotted to form two side lugs, which are connected to both ends of the shift pin. The gap between the two side lugs is greater than the thickness of the moving rod. The wheel-type shift fork is provided with a connecting hole, and the main shaft passes through the connecting hole and is axially positioned by a connector.

[0009] In some optional embodiments, a support is provided between the strip insulating plate and the moving rod. One end of the support is fixedly connected to the insulating plate, and the other end of the support is provided with a receiving groove. The wheel-type fork and the moving rod are embedded in the receiving groove, and a through hole is provided on the support at the position corresponding to the connecting hole.

[0010] In some alternative implementations, the number of switching positions between the stationary contact group and the moving contact is the same as the number of locking arc-shaped grooves.

[0011] In some alternative embodiments, the connecting bracket is provided with a guide hole corresponding to the position of the movable rod, and the movable rod passes through the guide hole and moves along the guide hole.

[0012] In some alternative implementations, the bottom end of the spindle is provided with a stepped portion, which passes through a wheel-type shift fork and / or support, and the end is connected to an anti-slip pad by a screw.

[0013] In some alternative implementations, the outer surface of the stepped portion of the spindle is symmetrically provided with two platform surfaces, and the connecting hole is a drum-shaped positioning hole configured with the stepped portion.

[0014] The beneficial effects of this application are as follows: The linear grooved wheel structure non-excitation strip tap changer provided by this application has an operating mechanism that drives the wheel fork to rotate, thereby moving the moving rod to shift gears. The moving contact will only move when the pin rotates in and out of the U-shaped groove. During the process of the pin rotating from the initial position to the initial position after rotating in and out, the moving rod will not be subjected to force and will not shift due to the configuration of the arc wheel surface and the locking arc groove. The moving contact will not be displaced. The transmission accuracy is high, the positioning is accurate, the contact performance of the tap changer is improved, and poor contact caused by the displacement of the moving contact is avoided. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a front view of an embodiment of this application;

[0017] Figure 2 for Figure 1 AA view;

[0018] Figure 3 for Figure 1 BB view;

[0019] Figure 4 This is a schematic diagram of the initial state of the cancellation according to an embodiment of this application;

[0020] Figures 5a-5d This is a schematic diagram of the initial state of the cancellation according to an embodiment of this application. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] The features and performance of this application will be further described in detail below with reference to the embodiments.

[0029] like Figures 1-3As shown, this utility model provides a non-excitation strip tap changer with a linear grooved wheel structure, including an operating mechanism 1, a switch body, and a connecting bracket 2. The operating mechanism is fixed to the top of the transformer tank cover 3 and connected to the switch body below via a main shaft 4. The switch body includes a stationary contact assembly and a moving contact assembly. The stationary contact assembly includes a strip insulating plate 5 and stationary contact groups spaced apart thereon. The strip insulating plate is fixedly connected to the lower end of the connecting bracket, and the top of the connecting bracket is connected to the transformer tank cover. The stationary contact group is composed of multiple stationary contacts 6 evenly spaced. The moving contact assembly includes a moving rod 7 parallel to one side of the insulating plate. Moving contacts 8 are arranged at intervals on the moving rod corresponding to each group of stationary contacts. The moving rod is movably supported by the connecting bracket. An intermittent transmission locking mechanism is installed between the moving rod and the main shaft. The rotation of the main shaft drives the moving rod to move intermittently, so that the moving contacts move relative to the stationary contact group for contact-type shifting.

[0030] The intermittent transmission locking mechanism includes a wheel-type shift fork 9 connected to the main shaft and a locking arc-shaped groove 10 located on the side of the moving rod. A U-shaped groove 11 configured with a shift pin is provided between each locking arc-shaped groove. One end of the wheel-type shift fork is provided with an arc-shaped wheel surface 12 configured with the locking arc-shaped groove, and the other end is provided with a shift pin 13 with a rotation radius greater than the radius of the arc-shaped wheel surface, which extends radially. The locking arc-shaped grooves are arranged at equal intervals along the longitudinal direction of the side of the moving rod.

[0031] In some alternative implementations, one end of the wheel fork is slotted to form two side lugs, which are connected to both ends of the pin. The gap between the two side lugs is greater than the thickness of the moving rod. The wheel fork is provided with a connecting hole, through which the main shaft passes and is axially positioned by a connector.

[0032] In some alternative embodiments, a support 14 is provided between the insulating plate and the moving rod. One end of the support is fixedly connected to the insulating plate, and the other end of the support is provided with a receiving groove. The wheel-type shift fork and the moving rod are embedded in the receiving groove. A through hole is provided on the support at the position corresponding to the connecting hole, and the main shaft passes through the through hole together.

[0033] The working process of the transmission locking mechanism is as follows:

[0034] like Figure 4 As shown, the operating mechanism drives the wheel-type shift fork to rotate circumferentially. During the process from the initial position line to the pin entering the slot (let's call this rotation angle α), and the process of the pin rotating back to the initial position line after exiting the slot (let's call this rotation angle β), the arc-shaped surface of the wheel-type shift fork slides relative to the locking arc-shaped groove of the moving rod. The moving contact does not move, locking the switch to the new position. Only when the pin rotates from entering to exiting the U-shaped slot does the moving contact move, completing the tap changer position shift.

[0035] The operating mechanism drives the wheel-type shift fork to rotate one full circle, changing the tap changer by one position. That is, the pin rotates 360° from the initial position line and returns to the initial position line, completing one position change. The central angle of the arc-shaped wheel surface is greater than 180°.

[0036] The number of switching positions between the stationary contact assembly and the moving contact assembly is the same as the number of locking arc grooves. That is, the locking arc groove corresponding to the wheel fork is replaced once every time the tap changer changes position.

[0037] In some optional implementations, the connecting bracket is provided with guide holes corresponding to the positions of the movable rods. The movable rods pass through the guide holes and move along the guide holes, which not only provides space for the movable rods to move, but also supports and guides them.

[0038] In this embodiment, the bottom end of the spindle is provided with a stepped portion 15. After the stepped portion passes through the wheel fork and the support, the end is connected to the anti-detachment pad 17 by a screw 16. The spindle diameter is changed by setting the stepped portion, which naturally forms a limiting stop with the wheel fork and the support. The bottom end is fastened and limited by the anti-detachment pad to prevent detachment, ensuring the installation stability of the spindle.

[0039] In this embodiment, the outer surface of the stepped portion of the main shaft is symmetrically provided with two platform surfaces, and the connecting hole of the wheel fork is a drum-shaped hole configured with the stepped portion. The connection between the main shaft and the wheel fork is realized through the configuration of the irregular shaft and the irregular hole. When the main shaft rotates, the wheel fork will rotate accordingly.

[0040] The above-mentioned method of using the non-excitation strip tap changer includes the following steps:

[0041] 1. When the tap changer is in a certain position, the intermittent transmission locking mechanism is in the initial position, that is, the arc surface of the wheel fork matches the locking arc groove of the moving rod, and the midpoint of the arc surface coincides with the midpoint of the locking arc groove.

[0042] 2. When the tap changer is shifted, the operating mechanism drives the main shaft to rotate, which in turn drives the connected wheel fork to rotate circumferentially. From the initial position, the fork rotates until the pin enters the U-shaped groove. During this process, the arc-shaped wheel surface rotates clockwise or counterclockwise along the locking arc groove, and the moving rod does not translate. This continues until one end of the arc-shaped wheel surface coincides with the midpoint of the locking arc groove. The main shaft continues to rotate, and the pin moves the moving rod, causing the moving contact to move as well. This continues until the pin rotates out of the U-shaped groove, and the tap changer completes the shift. At this point, the other end of the arc-shaped wheel surface coincides with the midpoint of the adjacent locking arc groove, and the moving rod stops translating. The wheel fork continues to rotate, and the arc-shaped wheel surface rotates along the adjacent locking arc groove until the midpoint of the arc-shaped wheel surface coincides with the midpoint of the adjacent locking arc groove. At this point, the wheel fork returns to the initial position. During this process, the moving contact does not move, locking the new tap changer position.

[0043] 3. Rotate the spindle forward or backward, and repeat the above steps to change gears.

[0044] In some alternative implementations, the tap changer changes one position with one full rotation, or it can be set to change one position with 2, 3, or more full rotations as needed.

[0045] In some optional implementations, the tap changer operating mechanism and the switch body are an integral structure, with one rotation changing one gear. Alternatively, it can be set to change one gear after 2, 3, or more rotations as needed.

[0046] In some alternative implementations, the operating mechanism is fixed to the top of the transformer box cover, and the bottom can be connected to the main shaft via coupling 18 (the operating mechanism and the switch body are separate structures), or it can be directly connected to the main shaft (the operating mechanism and the switch body are integral structures).

[0047] Example 1

[0048] like Figures 5a-5d As shown, taking a stationary contact group with three positions, where the moving contact bridges two stationary contacts to form one position, and the tap changer rotates one revolution to change one position as an example, in this case, the moving contact is located in the middle position of the stationary contact group, and the wheel-type shift fork is located in the middle locking arc groove of the moving rod, in the initial vertical state with the pin at the top and the arc wheel surface at the bottom. When it is necessary to adjust to the left position, the operating mechanism drives the wheel-type shift fork to rotate counterclockwise, and the arc wheel surface continues to rotate in reverse along the locking arc groove, while the moving rod does not move. After the pin rotates α angle from the initial position, it enters the U-shaped shift groove on the left (see...). Figure 5a At this point, the left end of the arc-shaped wheel surface coincides with the midpoint of the locking arc-shaped groove in the middle position. The wheel-type shift fork continues to rotate, and the left end of the arc-shaped wheel surface slides past the midpoint of the locking arc-shaped groove in the middle position. The shift pin moves the moving rod to the right, and the moving contact moves to the right. The wheel-type shift fork continues to rotate until the shift pin rotates out of the U-shaped shift groove on the left (see...). Figure 5c At this point, the right end of the arc-shaped wheel surface coincides with the midpoint of the left-side locking arc-shaped groove, the moving rod stops moving to the right, and the moving contact also stops moving and is positioned on the left side of the gear. After the wheel fork continues to rotate by an angle β, the midpoint of the arc-shaped wheel surface coincides with the midpoint of the left-side locking arc-shaped groove, the wheel fork returns to its initial state, and the gear shift is complete.

[0049] The operating mechanism drives the wheeled shift fork to rotate forward and backward to switch between different gears.

[0050] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A non-salient pole strip type distribution switch with straight slot wheel structure, comprising an operating mechanism, a switch body and a connecting bracket, the operating mechanism is fixed on the top of the transformer tank cover, and is connected with the switch body through a main shaft below, the switch body comprises a static contact assembly and a moving contact assembly, the static contact assembly comprises a strip-shaped insulating plate and a static contact group arranged at intervals thereon, the strip-shaped insulating plate is connected and fixed with the lower end of the connecting bracket, the top of the connecting bracket is connected with the transformer tank cover, and the static contact group is composed of a plurality of static contacts uniformly arranged at intervals, characterized in that, The moving contact assembly comprises a moving rod arranged in parallel on one side of the insulating plate, and the moving rod is provided with corresponding moving contacts arranged in groups between each group of static contacts, the moving rod is movably supported by a connecting support, and an intermittent transmission locking mechanism is arranged between the moving rod and the main shaft, the main shaft rotates to drive the moving rod to move intermittently, so that the moving contacts move in contact with the static contact groups.

2. A non-salient pole tap changer with straight slot wheel structure according to claim 1, characterized in that The intermittent transmission locking mechanism comprises a wheel type shift fork connected with the main shaft and an arc-shaped locking groove arranged on the side of the moving rod, one end of the wheel type shift fork is provided with a circular arc wheel surface arranged in the arc-shaped locking groove, the other end extends radially and is provided with a shift pin with a radius greater than that of the circular arc wheel surface, the arc-shaped locking grooves are longitudinally and equidistantly arranged on the side of the moving rod, and U-shaped shift grooves arranged in the shift pin are arranged between the arc-shaped locking grooves.

3. A non-salient pole tap changer with straight slot wheel structure according to claim 2, characterized in that The circular arc wheel surface at one end of the wheel type shift fork is a half or more than half circular arc wheel surface.

4. A non-salient pole tap changer with straight slot wheel structure according to claim 3, characterized in that The wheel type shift fork is provided with two side ear plates formed by slotting one end of the wheel type shift fork, the two side ear plates are connected with the two ends of the shift pin, the gap between the two side ear plates is greater than the thickness of the moving rod, the wheel type shift fork is provided with a connecting hole, and the main shaft is axially positioned by the connecting member after penetrating through the connecting hole.

5. A non-salient pole tap changer with straight slot wheel structure according to claim 4, characterized in that A support is arranged between the strip-shaped insulating plate and the moving rod, one end of the support is fixedly connected with the insulating plate, the other end of the support is provided with a containing groove, the wheel type shift fork and the moving rod are embedded in the containing groove, and the support is provided with a through hole corresponding to the connecting hole.

6. A non-superposing strip-type tap changer with straight slot wheel arrangement according to claim 4 or 5, characterized in that The number of gear positions of the static contact group and the moving contact is the same as the number of the arc-shaped locking grooves.

7. A non-salient pole tap changer with straight slot wheel arrangement according to claim 6, characterized in that The connecting support is provided with a guide hole corresponding to the position of the moving rod, the moving rod penetrates through the guide hole and moves along the guide hole.

8. A non-salient pole tap changer with straight slot wheel arrangement according to claim 7, characterized in that The bottom end of the main shaft is provided with a step portion, the step portion penetrates through the wheel type shift fork and / or the support, and the end head is connected with a screw connection anti-loose pad.

9. A non-salient pole tap changer with straight slot wheel arrangement according to claim 8, characterized in that The outer surface of the step portion of the main shaft is symmetrically provided with two platform surfaces, and the connecting hole is a drum-shaped positioning hole arranged in the step portion.

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