Aerial distribution switch

Abstract

The utility model discloses a kind of line tap switch, comprising: tap switch body, comprising: static contact subassembly, with multiple static contact groups;Moving contact subassembly, with multiple moving contacts;Operating mechanism, comprising: support;Pulley block, be in support, pulley block has driving wheel, first movable pulley and second movable pulley, driving wheel is respectively connected with first movable pulley and second movable pulley transmission, first movable pulley and second movable pulley are connected with support with the mode of movable along first direction;First pull wire, the both ends of first pull wire are respectively connected with moving contact subassembly and first movable pulley transmission;Second pull wire, the both ends of second pull wire are respectively connected with moving contact subassembly and second movable pulley transmission.The utility model is by using the structure design of pulley block's line tap switch, to increase power arm to reduce the operating torque when adjusting gear, installation is flexible, and reliability is improved.

Description

Technical Field

[0001] This utility model relates to the field of tap changer technology, and in particular to a pull-wire tap changer. Background Technology

[0002] Currently, traditional transformer tap changers typically employ an integrated structure where the operating mechanism is directly mechanically connected to the switch body. For example, a strip tap changer uses a rack and pinion mechanism to drive the moving contact assembly to move linearly along the stationary contact assembly, thereby switching the tap position; while a disc tap changer uses a rotary operating mechanism to rotate the moving contact in a circumferential direction, changing the contact position with the stationary contact, thereby switching the contact position.

[0003] However, this integrated structure requires careful consideration of the positional matching between the switch body and the operating mechanism during installation. Often, the operating mechanism and switch body need to be fixed together to the transformer tank cover or wall, resulting in poor installation flexibility. To coordinate the positional relationship between the operating mechanism and the switch body, the tank size usually needs to be increased, or the tap changer needs to be moved away from the coil tap outlet, leading to a waste of space and materials. Furthermore, improper positioning of the operating mechanism can significantly increase the difficulty of operation and reduce the reliability of the tap changer. Utility Model Content

[0004] The purpose of this invention is to solve the problems of poor installation flexibility and high operation difficulty of existing integrated transformer tap changers. This invention provides a pull-wire tap changer that, by employing a pulley block design, increases the power arm to reduce the operating torque when adjusting the tap position, resulting in more flexible installation and improved reliability.

[0005] To solve the above-mentioned technical problems, this utility model discloses a pull-cord tap changer, comprising: a tap changer body, including: a stationary contact assembly having multiple stationary contact groups; a moving contact assembly having multiple moving contacts, wherein each moving contact corresponds one-to-one with one of the multiple stationary contact groups, and the moving contact assembly and the stationary contact assembly are connected in a movable manner along a first direction, so that the moving contact and the corresponding stationary contact group slide and switch in the first direction; an operating mechanism, including: a bracket; a pulley group disposed on the bracket, the pulley group having a drive wheel, a first moving pulley and a second moving pulley, the drive wheel being drivenly connected to the first moving pulley and the second moving pulley respectively, and both the first moving pulley and the second moving pulley being movably connected to the bracket in the first direction; the first... A pull wire is provided, with both ends of the first pull wire being driven to the moving contact assembly and the first moving pulley, respectively, so that the moving contact assembly is driven to the first moving pulley; a second pull wire is provided, with both ends of the second pull wire being driven to the moving contact assembly and the second moving pulley, respectively, so that the moving contact assembly is driven to the second moving pulley; the driving wheel can rotate forward under the action of an external force to drive the first moving pulley to move to the left along the first direction, and drive the moving contact assembly to move to the right relative to the stationary contact assembly along the first direction; or, the driving wheel can rotate in the opposite direction under the action of an external force to drive the second moving pulley to move to the right along the first direction, and drive the moving contact assembly to move to the left relative to the stationary contact assembly along the first direction.

[0006] Using the above technical solution, the driving wheel in this embodiment can rotate in the forward circumferential direction under the action of an external force. Since the driving wheel is connected to the first movable pulley, it can drive the first movable pulley to move to the left relative to the bracket in the first direction. Then, pulling the second pull cable to move to the left in the first direction causes the moving contact assembly connected to one end of the second pull cable to move to the right in the first direction; or, the driving wheel can rotate in the reverse circumferential direction under the action of an external force, causing the second movable pulley to move to the right relative to the bracket in the first direction. Then, pulling the first pull cable to move to the right in the first direction causes the moving contact assembly connected to one end of the first pull cable to move to the left in the first direction, thereby changing the connection position of the moving contact relative to different stationary contacts in the stationary contact group, realizing the position switching of the pull-wire tap changer in this embodiment.

[0007] Therefore, the pull-cord tap switch of this embodiment can effectively transmit the operating force applied to the operating mechanism to the moving contact in the moving contact assembly through the first and second pull wires via the pulley block. This, in turn, drives the moving pulley assembly to move via the drive wheel, changing the movement of the moving contact relative to the stationary contact assembly, thus achieving remote tapping operation. The pull-cord tap switch of this embodiment has a simple and compact structure, is easy to operate, and has high reliability. The operating mechanism can be installed in a suitable position for operation. Furthermore, the operating mechanism of this embodiment adopts a pulley block design, which reduces the operating torque when adjusting the gear by adding a power arm, making installation flexible and improving reliability.

[0008] According to another specific embodiment of the present invention, a pull-wire tap changer is disclosed, comprising a movable pulley frame slidably connected to a bracket, wherein a first movable pulley and a second movable pulley are both disposed on the movable pulley frame; a first connecting belt, one end of which is fixedly connected to the drive wheel, and the other end of which is fixedly connected to the bracket, and the first connecting belt is wound around the drive wheel and the first movable pulley; and a second connecting belt, one end of which is fixedly connected to the drive wheel, and the other end of which is fixedly connected to the bracket, and the second connecting belt is wound around the drive wheel and the second movable pulley.

[0009] Using the above technical solution, the pull-cord tap changer of this application embodiment can be wound and connected to the drive wheel and the first movable pulley through the first connecting belt, and wound and connected to the drive wheel and the second movable pulley through the second connecting belt, so that the drive wheel is respectively connected to the first movable pulley and the second movable pulley for transmission. That is, the force is balanced and transmitted through the cooperation of the first movable pulley, the second movable pulley and the connecting belt, thereby improving the smoothness of movement and the transmission efficiency between the drive wheel and the first movable pulley and the second movable pulley.

[0010] According to another specific embodiment of the present invention, a pull-wire tap switch is disclosed. The bracket is provided with a slide rail that extends along a first direction. The movable pulley frame is provided with a slider that is adapted to the slide rail. The drive wheel is used to drive the movable pulley frame to slide relative to the slide rail along the first direction.

[0011] By adopting the above technical solution, the pull-wire tap changer of this application embodiment can ensure that the movable pulley frame slides accurately in the first direction through the slide rail and slider structure, avoiding deflection and jamming.

[0012] According to another specific embodiment of the present invention, a pull-wire tap changer is disclosed, wherein the pulley block further includes a fixed pulley disposed on the bracket, and the second connecting belt is sequentially wound and connected to the drive wheel, the fixed pulley and the second movable pulley.

[0013] By adopting the above technical solution, the embodiments of this application can change the direction of the connecting belt through the fixed pulley, optimize the layout space and enhance the transmission stability.

[0014] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a pull-wire tap changer, wherein the extension directions of the first connecting strips on both sides of the first movable pulley are parallel to each other, and the extension directions of the second connecting strips on both sides of the second movable pulley are parallel to each other.

[0015] By adopting the above technical solution, the pull-wire tap changer of this application embodiment can not only reduce the operating torque of driving the drive wheel to rotate in the circumferential direction or in the opposite direction when adjusting the gear, but also enable the first connecting belt to extend parallel to both sides of the first moving pulley and the second connecting belt to extend parallel to both sides of the second moving pulley, thereby reducing friction and wear and extending the service life of the pulley block.

[0016] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a pull-wire tap switch, wherein the operating mechanism further includes an operating handle, the operating handle is connected to the drive wheel, the operating handle is provided with a gear position mark, and along the second direction, the drive wheel and the operating handle are located on opposite sides of the bracket.

[0017] By adopting the above technical solution, manual operation can be conveniently performed through the operating handle, and the disengagement position can be clearly indicated by the gear position markings, thereby improving the intuitiveness of operation.

[0018] According to another specific embodiment of the present invention, a pull-cord tap switch is disclosed. The bracket includes: a first bracket side plate, with first connecting frames at both ends along the first direction, the first connecting frames extending along a second direction; a second bracket side plate, with second connecting frames at both ends along the first direction, the second connecting frames extending along the second direction; along the second direction, the second bracket side plate and the first bracket side plate are spaced apart, the first connecting frames and the second connecting frames are plugged into each other, the second bracket side plate and the first bracket side plate together define an accommodating space, and the pulley assembly is accommodated in the accommodating space.

[0019] By adopting the above technical solution, the pull-wire tap changer of this application embodiment can form a stable housing space with the bracket side plate and the connecting frame, thus protecting the internal mechanism.

[0020] According to another specific embodiment of the present invention, a pull-wire tap changer is disclosed. The pull-wire tap changer further includes a first sleeve, which corresponds to the first pull wire and is sleeved on the first pull wire. The two ends of the first sleeve are respectively connected to the bracket and the stationary contact assembly; and a second sleeve, which corresponds to the second pull wire and is sleeved on the second pull wire. The two ends of the second sleeve are respectively connected to the bracket and the stationary contact assembly.

[0021] By adopting the above technical solution, the pull-wire tap changer of this application embodiment can protect the pull wire from external interference through the bushing, avoiding mechanical damage and electrical short circuit risks.

[0022] According to another specific embodiment of the present invention, a pull-wire tap changer is disclosed, wherein the two ends of the first sleeve are respectively connected to the end of the bracket and the end of the stationary contact assembly through adjusting screws for adjusting the tension of the pull wire, and the two ends of the second sleeve are respectively connected to the end of the bracket and the end of the stationary contact assembly through adjusting screws for adjusting the tension of the pull wire.

[0023] By adopting the above technical solution, the pull-wire tap changer of this application embodiment can flexibly adjust the tension of the pull wire by adjusting the screw, ensuring reliable contact between the moving contact and the stationary contact.

[0024] According to another specific embodiment of the present invention, a pull-wire tap changer is disclosed. The stationary contact assembly includes an insulating plate extending along a first direction, and a plurality of stationary contact groups are spaced apart on the insulating plate along the first direction. The moving contact assembly includes a drive plate extending along the first direction, and a plurality of moving contacts are spaced apart on the drive plate along the first direction. The drive plate and the insulating plate are arranged in parallel.

[0025] By adopting the above technical solution, the pull-wire tap changer of this application embodiment can ensure contact alignment accuracy and improve electrical connection stability through the parallel arrangement of insulating plates and drive plates.

[0026] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a pull-wire tap changer, wherein a fixing seat is provided on the insulating plate, and the fixing seat is located on opposite sides of each of the stationary contact groups along the first direction.

[0027] By adopting the above technical solution, the pull-wire tap changer of this application embodiment can enhance the structural strength of the insulating plate through the fixed base, prevent deformation and improve the overall mechanical stability.

[0028] To make the above-mentioned contents of this utility model more obvious and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0029] Figure 1 A perspective view of a pull-cord tap switch according to an embodiment of the present invention is shown;

[0030] Figure 2 A perspective view of the tap changer body according to an embodiment of the present invention is shown;

[0031] Figure 3 A three-dimensional view of the operating mechanism of this utility model embodiment is shown. Figure 1 ;

[0032] Figure 4 A three-dimensional view of the operating mechanism of this utility model embodiment is shown. Figure 2 The second support side plate is hidden. Detailed Implementation

[0033] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0034] It should be noted that in this specification, similar reference numerals 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.

[0035] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", 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 that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model 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. Therefore, they should not be construed as limitations on the utility model.

[0036] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0037] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" 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 embodiment based on the specific circumstances.

[0038] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0039] Figure 1 A perspective view of a pull-wire tap changer is shown according to some embodiments of this application.

[0040] refer to Figure 1 An embodiment of this application provides a pull-cord tap changer 100, which includes a tap changer body 110 and an operating mechanism 120. The tap changer body 110 includes a stationary contact assembly 111 and a moving contact assembly 112 adapted to the stationary contact assembly 111, that is, the moving contact assembly 112 and the stationary contact assembly 111 slide and switch relative to each other.

[0041] For example, such as Figure 1 and Figure 2 As shown, similar to existing tap changer structures, the stationary contact assembly 111 includes an insulating plate 111a and three stationary contact groups 111b, the three stationary contact groups 111b being aligned along a first direction (e.g., ...). Figure 1 (As shown in the X direction) The moving contact assembly 112 is spaced apart on the insulating plate 111a. It includes a drive plate 112a and three moving contacts 112b, and the three moving contacts 112b are mounted on the drive plate 112a.

[0042] Specifically, the drive plate 112a and the insulating plate 111a are arranged parallel to each other along the first direction X. The three moving contacts 112b correspond one-to-one with the three stationary contact groups 111b and cooperate with each other. The moving contact assembly 112 and the stationary contact assembly 111 slide together. By moving the moving contact assembly 112 relative to the stationary contact assembly 111 along the first direction, each moving contact 112b is driven to slide on the corresponding stationary contact group 111b, so that the moving contact 112b makes contact with different stationary contacts 111c in the stationary contact group 111b, and completes the switching of different taps of the transformer.

[0043] The embodiments of this application do not specifically limit the number of stationary contact groups 111b in the stationary contact assembly 111 and the number of moving contacts 112b in the moving contact assembly 112. For example, in other possible implementations, the number of stationary contact groups 111b and moving contacts 112b may correspond to one, two, four, five, six or more.

[0044] For example, such as Figure 1 and Figure 2 As shown, the insulating plate 111a is provided with a fixing seat 111d for fixing the tap changer body 110, so as to facilitate the installation of the tap changer body 110. Along the first direction X, four fixing seats 111d are spaced apart on opposite sides of each of the three stationary contact groups 111b.

[0045] refer to Figure 3 and combined Figure 1 and Figure 2 The pull-cord tap changer 100 in this embodiment further includes a first pull cord 130c and a second pull cord 130d. The operating mechanism 120 and the tap changer body 110 are connected by the first pull cord 130c and the second pull cord 130d.

[0046] Specifically, such as Figure 3 and Figure 2 As shown, the operating mechanism 120 of this embodiment includes a bracket 121 and a pulley assembly 122. The pulley assembly 122 is mounted on the bracket 121 and includes a drive wheel 1221, a first movable pulley 1222, and a second movable pulley 1223. The drive wheel 1221 is operatively connected to both the first movable pulley 1222 and the second movable pulley 1223, and both the first movable pulley 1222 and the second movable pulley 1223 are movably connected to the bracket 121 along a first direction X. The two ends of the first pull wire 130c are operatively connected to the moving contact assembly 112 and the first movable pulley 1222, respectively, and the two ends of the second pull wire 130d are operatively connected to the moving contact assembly 112 and the second movable pulley 1223, respectively.

[0047] Therefore, the drive wheel 1221 of this embodiment can move circumferentially (e.g., under the action of an external force (such as the force applied by the operating handle 123 described later) under the action of an external force (such as the force applied by the operating handle 123 described later). Figure 3 (As shown in the R direction) Positive direction (e.g.) Figure 3 As shown in the R1 direction, the drive wheel 1221 rotates, and since it is connected to the first movable pulley 1222, it can drive the first movable pulley 1222 to the left relative to the bracket 121 along the first direction X (as shown in the R1 direction). Figure 4(As shown in the X1 direction) the movement drives the second movable pulley 1223 to move to the left X1 relative to the bracket 121 along the first direction X. Furthermore, the movement of the second movable pulley 1223 to the left X1 along the first direction pulls the second pull cable 130d, which is connected to the second movable pulley 1223, to move to the left X1 along the first direction, thereby driving the drive plate 112a, which is connected to one end of the second pull cable 130d, to move to the right along the first direction X (as shown in the X1 direction). Figure 2 (as shown in the X2 direction); or, the driving wheel 1221 can be reversed in the circumferential direction under the action of an external force (as shown in the X2 direction). Figure 3 The rotation of the pulley (in the direction shown in R2) causes the second movable pulley 1223 to move X2 to the right relative to the bracket 121 along the first direction X, and also causes the first movable pulley 1222 to move X2 to the right relative to the bracket 121 along the first direction X. Furthermore, the movement of the first movable pulley 1222 to the right X2 along the first direction pulls the first pull cable 130c, which is connected to the first movable pulley 1222, to move X2 to the right along the first direction. This causes the drive plate 112a, connected to one end of the first pull cable 130c, to move X1 to the left along the first direction, thereby changing the connection position of the movable contact 112b relative to different stationary contacts 111c in the stationary contact group 111b, thus realizing the gear switching of the pull cable tap changer 100 in this embodiment of the application.

[0048] For example, such as Figure 4 As shown, the drive wheel 1221 rotates two gears in the circumferential positive direction R1, i.e., switching from the second gear to the fourth gear. The drive wheel 1221 drives the first movable pulley 1222 to move a corresponding distance to the left X1 in the first direction, so that the second pull wire 130d is pulled to the left X1 in the first direction, and the first pull wire 130c is released a corresponding distance. This causes the movable contact 112b of the movable contact assembly 112, which is connected to the first pull wire 130c and the second pull wire 130d respectively, to move a corresponding distance to the right X2 in the first direction relative to the stationary contact assembly 111b of the insulating plate 111a, for example, the distance of the two gears mentioned above, thereby realizing the switching of the two gears of the pull wire tap changer 100, i.e., switching from the second gear to the fourth gear.

[0049] Alternatively, the drive wheel 1221 rotates one gear in the reverse direction R2, i.e., switching from the fourth gear to the third gear. The drive wheel 1221 drives the second movable pulley 1223 to move a corresponding distance to the right X2 in the first direction, so that the first pull wire 130c is pulled to the right X2 in the first direction, and the second pull wire 130d is released a corresponding distance. This causes the movable contact 112b of the movable contact assembly 112, which is connected to the first pull wire 130c and the second pull wire 130d respectively, to move a corresponding distance to the left X1 in the first direction relative to the stationary contact assembly 111b of the insulating plate 111a, for example, the distance of one gear as described above. This achieves the switching of one gear of the pull wire tap changer 100, i.e., switching from the fourth gear to the third gear.

[0050] In summary, the embodiments of this application can effectively transmit the operating force applied to the operating mechanism 120 through the pulley block 122 to the drive plate 112a in the moving contact assembly 112, where the moving contact 112b is installed, via the first pull wire 130c and the second pull wire 130d. This allows the first moving pulley 1222 and the second moving pulley 1223 to move via the drive wheel 1221, changing the position of the moving contact 112b on the drive plate 112a relative to the stationary contact assembly 111b on the insulating plate 111a, thereby realizing remote tapping operation. The pull wire tap switch 100 of the embodiments of this application has a simple and compact structure, is easy to operate, and has high reliability. The operating mechanism 120 can be installed in a suitable position for operation.

[0051] Furthermore, compared to existing integrated transformer tap changers, the pull-wire tap changer 100 of this application embodiment can be designed with the position of the stationary contact group 111b in the tap changer body 110 according to the distance of the transformer coil, eliminating the need for the tap changer body 110 to be far from the tap outlet position of the transformer coil, thus saving the cost of transformer copper wire. Moreover, the operating mechanism 120 of this application embodiment adopts a pulley block structure design, which reduces the operating torque when adjusting the gear by adding a power arm, making installation flexible and improving reliability.

[0052] The specific structure of the pull-wire tap changer 100 according to the present application will be described in detail below with reference to the accompanying drawings.

[0053] For example, such as Figure 4 As shown, the pulley block 122 in this embodiment further includes: a movable pulley frame 1222a, a first connecting belt 1222b, and a second connecting belt 1222c. Exemplarily, both the first connecting belt 1222b and the second connecting belt 1222c are pulley wires.

[0054] Specifically, the movable pulley frame 1222a is slidably connected to the support 121. The first movable pulley 1222 and the second movable pulley 1223 are spaced apart on the movable pulley frame 1222a along the first direction X. For example, the movable pulley 1222 is rotatably connected to the movable pulley frame 1222a through the rotating shaft 1222d. Along the first direction X, both ends of the movable pulley frame 1222a are provided with connecting holes 1222e so that the first pull wire 130c and the second pull wire 130d are connected to the movable pulley frame 1222a through the corresponding connecting holes 1222e. Furthermore, since the first movable pulley 1222 and the second movable pulley 1223 are both located on the movable pulley frame 1222a, when the driving wheel 1221 drives the first movable pulley 1222 to move to the left X1 along the first direction, the second movable pulley 1223 moves synchronously with the first movable pulley 1222; or, when the driving wheel 1221 drives the second movable pulley 1223 to move to the right X2 along the first direction, the first movable pulley 1222 moves synchronously with the second movable pulley 1223.

[0055] like Figure 4 As shown, one end of the first connecting belt 1222b and one end of the second connecting belt 1222c are respectively wound and fixed on the drive wheel 1221 in opposite directions, and the other end of the first connecting belt 1222b and the other end of the second connecting belt 1222c are fixedly connected to the bracket 121 through the fixing post 1222f.

[0056] Along the first direction X, two fixed posts 1222f are located on opposite sides of the first movable pulley 1222 and the second movable pulley 1223, respectively. The first connecting belt 1222b is wound and connected to the driving wheel 1221 and the first movable pulley 1222, and the second connecting belt 1222c is wound and connected to the driving wheel 1221 and the second movable pulley 1223, so that the driving wheel 1221 is connected to the first movable pulley 1222 and the second movable pulley 1223 respectively.

[0057] For example, such as Figure 4 As shown, the bracket 121 of this embodiment is provided with a slide rail 121a, which extends along the first direction X. The movable pulley frame 1222a is provided with a slider 1222g, which is adapted to the slide rail 121a. When the drive wheel 1221 drives the first movable pulley 1222 and the second movable pulley 1223 to move via the first connecting belt 1222b and the second connecting belt 1222c, the first movable pulley 1222 and the second movable pulley 1223 are located on the movable pulley frame 1222a. Therefore, the first movable pulley 1222 and the second movable pulley 1223 drive the slider 1222g on the movable pulley frame 1222a to slide relative to the slide rail 121a along the first direction X. However, this embodiment does not limit the connection method between the movable pulley frame 1222a and the bracket 121, as long as the movable pulley frame 1222a can move relative to the bracket 121 along the first direction X.

[0058] For example, such as Figure 3 and Figure 4 As shown, the bracket 121 in this embodiment includes a first bracket side plate 121b and a second bracket side plate 121c. Along the second direction Y, the first bracket side plate 121b and the second bracket side plate 121c are arranged opposite to each other and define a receiving space 121d, so that the aforementioned pulley assembly 122 can be accommodated in the receiving space 121d, thereby protecting the internal mechanism and facilitating the installation of the operating mechanism 120 onto the transformer.

[0059] Specifically, the first support side plate 121b has a first connecting frame 121e, and the second support side plate 121c has a second connecting frame 121g, both extending along the second direction Y. Along the first direction X, the first connecting frame 121e is located at both ends of the first support side plate 121b, and the second connecting frame 121g is located at both ends of the second support side plate 121c. Furthermore, along the second direction Y, the first connecting frame 121e and the second connecting frame 121g are interlocked, so that the second support side plate 121c and the first support side plate 121b together define the receiving space 121d.

[0060] For example, the pull-cord tap changer 100 of this application embodiment further includes a first sleeve 140 and a second sleeve 141. The first sleeve 140 and the second sleeve 141 correspond one-to-one with the first pull wire 130c and the second pull wire 130d, respectively; that is, the first sleeve 140 is sleeved on the first pull wire 130c, and the second sleeve 141 is sleeved on the second pull wire 130d. Specifically, one end of the first sleeve 140 is connected to the second connecting frame 121g of the second bracket side plate 121c, and the other end of the first sleeve 140 is connected to the insulating plate 111a. One end of the second sleeve 141 is connected to the second connecting frame 121g of the second bracket side plate 121c, and the other end of the second sleeve 141 is connected to the insulating plate 111a.

[0061] To facilitate the connection of the pull wire 130 to the tap changer body 110 and the operating mechanism 120 in this embodiment, both ends of the first sleeve 140 and the second sleeve 141 are connected to the bracket 121 and the stationary contact assembly 111 respectively via adjusting screws 131 for adjusting the tension of the pull wire 130. That is, adjusting screws 131 are provided at the connection points of the sleeves to the ends of the bracket 121 (i.e., the second connecting bracket 121g of the second bracket side plate 121c) and at the connection points of the sleeves to the ends of the insulating plate 111a. The adjusting screws 131 can be used to adjust the tension of the pull wire 130, facilitating the installation and adjustment of the pull wire 130, and further facilitating the on-site installation of the pull wire tap changer 100 in this embodiment.

[0062] For example, the pulley block 122 in this embodiment of the application further includes a fixed pulley 1224. Specifically, as Figure 4 As shown, the fixed pulley 1224 is fixedly mounted to the first bracket side plate 121b of the bracket 121 via a rotating shaft. The aforementioned second connecting belt 1222c is sequentially wound and connected to the driving pulley 1221, the fixed pulley 1224, and the second movable pulley 1223. Furthermore, the extending directions of the first connecting belts 1222b on both sides of the first movable pulley 1222 (as shown in the diagram) Figure 4 (As shown in the X direction) The extension directions X of the second connecting belts 1222c on both sides of the second movable pulley 1223 are parallel to each other. This not only reduces the operating torque of driving the drive wheel 1221 to rotate in the circumferential direction R in the forward or reverse direction when adjusting the gear, but also allows the first connecting belt 1222b and the second connecting belt 1222c to extend parallel to each other on both sides of the movable pulley, reducing friction and wear, and extending the service life of the pulley block 122.

[0063] For example, such as Figure 4 As shown, the drive wheel 1221 has two end fixing grooves 1221a on its circumferential surface. The shape of one end of the first connecting belt 1222b and one end of the second connecting belt 1222c are both adapted to the end fixing grooves 1221a so that the first connecting belt 1222b and the second connecting belt 1222c can be fixedly connected to the drive wheel 1221.

[0064] For example, such as Figure 2 As shown, in order to connect the first pull wire 130c and the second pull wire 130d to the moving contact assembly 112 in the tap changer body 110, the stationary contact assembly 111 also includes a special-shaped frame 111e. Along the first direction, the special-shaped frame 111e is disposed at both ends of the insulating plate 111a and is threadedly connected to the insulating plate 111a, so that the sleeve 140 and the special-shaped frame 111e are connected by adjusting screws 131. That is, the connection between the sleeve 140 and the special-shaped frame 111e of the insulating plate 111a is provided with adjusting screws 131.

[0065] This application does not specifically limit the structure of the irregular frame 111e and the connection method between the irregular frame 111e and the insulating plate 111a. As long as it facilitates the connection between the first pull wire 130c and the second pull wire 130d and the two ends of the drive plate 112a, it can be set according to the actual situation. In the above embodiment, the structural design of the irregular frame 111e is adopted, which facilitates the connection between the pull wire and the tap changer body 110. The pull wire directly controls the movement of the moving contact assembly 112 on the drive plate 112a, which further simplifies the structure of the pull wire tap changer 100 in this application embodiment and makes the manufacturing of the tap changer body 110 simpler and more convenient.

[0066] For example, such as Figure 3 and Figure 4As shown, the operating mechanism 120 in this embodiment further includes an operating handle 123. The operating handle 123 is connected to the drive wheel 1221 via a transmission shaft 1231. The operating handle 123 can drive the drive wheel 1221 to rotate in the circumferential direction R. Furthermore, the operating handle 123 has a corresponding gear position indicator 1232 (see...). Figure 3 (The Arabic numeral "3" is used). Thus, the operating mechanism 120 of this application embodiment can remotely synchronize the tap changer body 110 by operating the handle 123.

[0067] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A pull-cord tap changer, characterized in that, include: The tap changer body includes: A stationary contact assembly, comprising a stationary contact group; A moving contact assembly has a moving contact corresponding to a set of stationary contacts. The moving contact assembly and the stationary contact assembly are connected in a movable manner along a first direction, so that the moving contact and the corresponding set of stationary contacts can slide and switch engagement along the first direction. Operating mechanism, including: support; A pulley system is provided on the support. The pulley system has a drive wheel, a first movable pulley, and a second movable pulley. The drive wheel is connected to the first movable pulley and the second movable pulley respectively. The first movable pulley and the second movable pulley are both connected to the support in a manner that allows them to move along the first direction. A first pull wire, the two ends of which are respectively connected to the moving contact assembly and the first moving pulley, so that the moving contact assembly is connected to the first moving pulley. The second pull wire has its two ends connected to the moving contact assembly and the second moving pulley respectively, so that the moving contact assembly is connected to the second moving pulley. The drive wheel can rotate forward under the action of an external force to drive the first movable pulley to move to the left along the first direction, and drive the movable contact assembly to move to the right relative to the stationary contact assembly along the first direction; or, the drive wheel can rotate in the opposite direction under the action of an external force to drive the second movable pulley to move to the right along the first direction, and drive the movable contact assembly to move to the left relative to the stationary contact assembly along the first direction.

2. The pull-wire tap changer according to claim 1, characterized in that, The pulley system also includes: A movable pulley frame is slidably connected to the bracket, and both the first movable pulley and the second movable pulley are provided on the movable pulley frame; A first connecting belt, one end of which is fixedly connected to the drive wheel, and the other end of which is fixedly connected to the bracket. The first connecting belt is wound around the drive wheel and the first movable pulley. The second connecting belt has one end fixedly connected to the drive wheel and the other end fixedly connected to the bracket. The second connecting belt is wound around the drive wheel and the second movable pulley.

3. The pull-wire tap changer according to claim 2, characterized in that, The bracket is provided with a slide rail that extends along the first direction. The movable pulley frame is provided with a slider that is adapted to the slide rail. The drive wheel is used to drive the movable pulley frame to slide relative to the slide rail along the first direction.

4. The pull-wire tap changer according to claim 2, characterized in that, The pulley block also includes a fixed pulley disposed on the bracket, and the second connecting belt is sequentially wound and connected to the drive pulley, the fixed pulley and the second movable pulley.

5. The pull-wire tap changer according to claim 4, characterized in that, The extension directions of the first connecting strips on both sides of the first movable pulley are parallel to each other, and the extension directions of the second connecting strips on both sides of the second movable pulley are parallel to each other.

6. The pull-wire tap changer according to claim 1, characterized in that, The operating mechanism also includes an operating handle, which is connected to the drive wheel via a transmission. The operating handle is provided with a gear position indicator. Along the second direction, the drive wheel and the operating handle are located on opposite sides of the bracket.

7. The pull-wire tap changer according to claim 6, characterized in that, The support includes: The first support side plate, along the first direction, has first connecting frames at both ends, and the first connecting frames extend along the second direction; The second support side plate, along the first direction, has second connecting frames at both ends, and the second connecting frames extend along the second direction; Along the second direction, the second bracket side plate is spaced apart from the first bracket side plate, the first connecting frame and the second connecting frame are inserted into each other, the second bracket side plate and the first bracket side plate together define the receiving space, and the pulley group is received in the receiving space.

8. The pull-wire tap changer according to claim 1, characterized in that, The pull-wire tap changer also includes: The first sleeve corresponds to the first pull wire and is sleeved on the first pull wire. The two ends of the first sleeve are respectively connected to the bracket and the stationary contact assembly. The second sleeve corresponds to the second pull wire and is sleeved on the second pull wire. The two ends of the second sleeve are respectively connected to the bracket and the stationary contact assembly.

9. The pull-wire tap changer according to claim 8, characterized in that, The two ends of the first sleeve are respectively connected to the end of the bracket and the end of the stationary contact assembly via adjusting screws for adjusting the tension of the pull wire. The two ends of the second sleeve are respectively connected to the end of the bracket and the end of the stationary contact assembly via adjusting screws for adjusting the tension of the pull wire.

10. The pull-wire tap changer according to claim 1, characterized in that, The stationary contact assembly includes an insulating plate that extends along the first direction, and the stationary contact group is disposed on the insulating plate along the first direction. The moving contact assembly includes a drive plate that extends along the first direction, and the moving contact is disposed on the drive plate along the first direction. The drive plate and the insulating plate are arranged in parallel.

11. The pull-wire tap changer according to claim 10, characterized in that, The insulating plate is provided with a fixing seat, and along the first direction, the fixing seat is located on opposite sides of each of the stationary contact groups.

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