A voltage transformer core fixing device

Abstract

The invention relates to the technical field of voltage transformers, and specifically discloses a voltage transformer core fixing device; the device comprises a mounting base, a transformer housing, a silicon steel sheet core and a core fixing device, wherein the core fixing device comprises two groups of core outer end fixing covers which are symmetrically arranged on the upper surface of the mounting base, and the two groups of core outer end fixing covers are arranged to move close to each other to clamp the two outer ends of the silicon steel sheet core located in the transformer housing; the voltage transformer core fixing device disclosed in the invention can fix and clamp the entire core in the horizontal and vertical directions, thereby improving the installation stability of the reinforced silicon steel sheet core, reducing the influence of the core instability on the excitation characteristics of the voltage transformer, and ensuring the stable input and output of the voltage on the voltage transformer.

Description

Technical Field

[0001] The invention relates to the technical field of voltage transformers, and in particular discloses a voltage transformer iron core fixing device. Background Art

[0002] Voltage transformer is a commonly used device in power system. It is composed of casing, core, coil and other components. It is mainly used to supply power to measuring instruments and relay protection devices, to measure the voltage, power and electric energy of the line, or to protect valuable equipment, motors and transformers in the line when a line fault occurs.

[0003] The iron core in the voltage transformer is divided into two types: integral type and silicon steel sheet stacked type. The silicon steel sheet stacked type is composed of E-shaped silicon steel sheets connected on both sides of the assembly car. During the assembly process of the voltage transformer, the operator needs to plug the individual E-shaped silicon steel sheets into each other in turn, and then fix them with connecting bolts to form an iron core as a whole.

[0004] For example, the invention patent with application number 2018116487858 discloses a voltage transformer, including a base, threaded holes, a first support group, a second support group, an insulating shell, a first high-voltage insulating sleeve, a positive primary terminal, a negative primary terminal, a second high-voltage insulating sleeve, a locking stud, a locking nut, a positive secondary terminal, a negative secondary terminal, a first limit jack, a second limit jack, a third support group, a fourth support group, a first iron core, a second iron core, a first winding and a second winding, a plurality of threaded holes are provided on the base, and a positive secondary terminal and a negative secondary terminal are provided on the side wall of the base. The voltage transformer core disclosed in the invention patent is composed of silicon steel sheets stacked and connected by bolts and nuts. On the one hand, the fixing method of the core of this type of voltage transformer is relatively complicated, requiring the operator to insert and connect the two sets of silicon steel sheets in sequence, and the connection method of fixing only by bolts and nuts cannot ensure the stability of the entire core after fixing, thereby affecting the excitation characteristics of the voltage transformer and failing to ensure the stable input and output of the voltage on the voltage transformer. Therefore, in view of the shortcomings of the core fixing structure design in the existing voltage transformer, the present invention proposes a voltage transformer core fixing device that can effectively solve the above technical problems. Summary of the invention

[0005] The present invention aims to provide a voltage transformer core fixing device to solve the problem that the existing voltage transformer is easy to loosen when it is fastened only by bolts and nuts.

[0006] The present invention is achieved through the following technical solutions:

[0007] A voltage transformer core fixing device comprises a mounting base, a transformer housing, a silicon steel sheet core and a core fixing device, wherein the core fixing device comprises two sets of core outer end fixing covers symmetrically arranged on the upper surface of the mounting base, and the two sets of core outer end fixing covers are arranged to move close to each other to clamp the two outer ends of the silicon steel sheet core located in the transformer housing;

[0008] Among them, the outer end fixing cover of the iron core includes a lower base and an upper pressure seat, the two ends of the lower base are fixedly connected with vertically upward guide columns, and the upper ends of the guide columns are provided with threaded grooves, the outer edge of the upper surface of the lower base is connected with a first baffle plate, and a plurality of strip-shaped openings 2 are spaced apart on the first baffle plate, and a through hole corresponding to the guide column is provided on the upper pressure seat, the outer edge of the lower surface of the upper pressure seat is connected with a second baffle plate, and the second baffle plate is connected with an offset strip aligned with each strip opening 2, and a fastening nut is screwed on the guide column above the upper pressure seat.

[0009] As a further arrangement of the above scheme, a longitudinally arranged strip movable groove is provided on the upper surface of the mounting base, a bidirectional screw rod is rotatably connected in the strip movable groove, the thread grooves at the front and rear ends of the bidirectional screw rod are arranged in opposite directions, and a movable block matching the strip movable groove is connected to the lower surface of the lower base in the fixed cover at the outer end of each group of the iron cores, a threaded hole matching the bidirectional screw rod is provided on the movable block, one end of the bidirectional screw rod extends out of the side surface of the mounting base, and a twisting block is connected to the outer end of the bidirectional screw rod.

[0010] As a further arrangement of the above scheme, two symmetrically arranged strip openings are provided at the left and right ends of the upper surface of the mounting base, a strip limiting groove is provided at the lower end of the strip opening, a bolt and nut connector is provided in each of the strip openings, and side strip plates are connected to the lower ends of the left and right side surfaces of the transformer housing, and connecting holes matching the bolt and nut connectors are provided on the side strip plates.

[0011] As a further configuration of the above solution, at least two bolt and nut connectors are provided in each of the strip-shaped openings.

[0012] As a further configuration of the above solution, a positive electrode terminal and a negative electrode terminal are respectively provided on the left and right sides of the upper end of the transformer housing.

[0013] As a further configuration of the above solution, the width and length of the second strip-shaped opening are set to be the same as the width and length of the offset strip.

[0014] As a further configuration of the above scheme, the silicon steel sheet core includes a plurality of first E-shaped silicon steel sheets neatly stacked up and down and a plurality of second E-shaped silicon steel sheets neatly stacked up and down, the first E-shaped silicon steel sheet is connected to the two proximal ends of the second E-shaped silicon steel sheet, and circular holes for passing through guide columns are provided on both sides of the outer ends of the first E-shaped silicon steel sheet and the outer ends of the second E-shaped silicon steel sheet, side channels for passing through the two ends of the first E-shaped silicon steel sheet are provided at the left and right ends of the transformer housing, a middle channel for passing through the coil sleeve on the first E-shaped silicon steel sheet is provided at the middle position of the transformer housing, and the middle channel is connected to the inner cavity of the transformer housing, and the coil sleeve is wound with a first coil winding and a second coil winding.

[0015] As a further configuration of the above scheme, L-shaped protrusions are extended from both ends of the first E-shaped silicon steel sheet and the second E-shaped silicon steel sheet that are close to each other, and the L-shaped protrusions on the first E-shaped silicon steel sheet and the L-shaped protrusions on the second E-shaped silicon steel sheet are centrally symmetrically arranged when they are close to each other, and a rectangular through groove is formed between the L-shaped protrusions on the first E-shaped silicon steel sheet and the second E-shaped silicon steel sheet, and a rectangular tensioning insert is arranged in the rectangular through groove.

[0016] As a further configuration of the above scheme, strip guide sockets are provided on both sides of the upper end of the transformer housing, a crossbeam is connected between the two strip guide sockets, a threaded connection hole is provided on the crossbeam, the two rectangular tensioning strips are arranged along the strip guide sockets, and a cross bar is connected between the upper ends of the two rectangular tensioning strips, and a connecting bolt matching the threaded connection hole is threadedly connected to the cross bar.

[0017] As a further configuration of the above scheme, a rectangular bayonet is provided at the end of the middle position of the first E-shaped silicon steel sheet, and a rectangular protrusion matching the rectangular bayonet is extended at the end of the middle position of the second E-shaped silicon steel sheet, and the rectangular protrusion is gap-matched with the rectangular bayonet. Beneficial Effects

[0018] The voltage transformer iron core fixing device disclosed in the present invention is provided with two groups of iron core outer end fixing covers on a mounting base, and the lower ends of the two groups of iron core outer end fixing covers are connected to the bidirectional lead screw through a movable block. When it is necessary to fix the entire voltage transformer iron core in the horizontal direction, the two groups of iron core outer end fixing covers are brought closer to each other by rotating the bidirectional lead screw, so that the four corners of the iron core can be pushed toward the center, thereby achieving a clamping effect, and preventing the voltage transformer iron core from loosening in the horizontal direction after installation, so that the fixing effect of the voltage transformer iron core is excellent.

[0019] The outer end fixing cover of the iron core in the present invention is composed of a lower base, an upper pressure seat, a guide rod, a fastening nut and other components. When the voltage transformer iron core is placed in the lower base, the upper pressure seat is pressed down by screwing in the fastening nut to clamp the entire iron core in the vertical direction. Moreover, the strip-shaped opening two on the lower base and the offset strip on the upper pressure seat are aligned and interspersed one by one, so that it has a better wrapping property for the outer side surface of the entire voltage transformer iron core, and can meet the clamping and fixing requirements of voltage transformer iron cores of different thicknesses, and can be suitable for voltage transformer iron cores of various thicknesses.

[0020] The present invention also improves the design of the voltage transformer core, and the contacting ends of the two groups of E-shaped silicon steel sheets are formed by L-shaped protrusions to form a rectangular through groove into which a tensioning strip can be inserted. When the two groups of E-shaped silicon steel sheets are neatly butt-jointed, the two groups of E-shaped silicon steel sheets can be tensioned and fixed by inserting the tensioning strip into the rectangular through groove along the guide socket; in addition, the cooperation between the rectangular protrusions and the rectangular bayonet on the two groups of E-shaped silicon steel sheets makes the two have an anti-pull effect, which can further improve the installation stability of the reinforced silicon steel sheet core, reduce the influence of the unstable core on the excitation characteristics of the voltage transformer, and ensure the stable input and output of the voltage on the voltage transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure from a first angle of the present invention;

[0023] Figure 2 It is a schematic diagram of the three-dimensional structure from a second angle of the present invention;

[0024] Figure 3 It is a schematic diagram of the planar structure in which the outer end fixing cover of the core in the present invention is arranged on the mounting base;

[0025] Figure 4 It is a schematic diagram of the three-dimensional structure of the mounting base in the present invention from a first angle;

[0026] Figure 5 It is a schematic diagram of the three-dimensional structure of the mounting base in the present invention from a second angle;

[0027] Figure 6 It is a three-dimensional exploded view of the fixing cover at the outer end of the core in the present invention;

[0028] Figure 7It is a three-dimensional structural diagram of the silicon steel sheet core and the outer end fixing cover of the core in the first angle of the present invention;

[0029] Figure 8 It is a second angle three-dimensional structural diagram of the silicon steel sheet core and the outer end fixing cover of the core in the present invention;

[0030] Fig. 9 It is a schematic diagram of the three-dimensional structure of the silicon steel sheet core in Example 2 of the present invention.

[0031] Fig.10 It is a schematic diagram of the three-dimensional structure of the transformer housing, rectangular tensioning strips, etc. in Example 2 of the present invention.

[0032] in:

[0033] 1-mounting base, 101-strip moving groove, 102-bidirectional screw rod, 103-twisting block, 104-strip opening 1, 1041-strip limiting groove, 105-bolt and nut connecting piece;

[0034] 2-transformer housing, 201-side strip plate, 2011-connection hole, 202-positive terminal, 203-negative terminal, 204-side channel, 205-middle channel, 206-insert guide socket, 207-crossbeam;

[0035] 3-silicon steel sheet core, 301-first E-shaped silicon steel sheet, 3011-rectangular bayonet, 302-second E-shaped silicon steel sheet, 3021-rectangular convex piece, 303-coil sleeve, 304-round hole, 305-L-shaped protrusion, 306-rectangular through slot, 307-rectangular tensioning strip, 308-horizontal bar, 309-connecting bolt;

[0036] 4-fixed cover at the outer end of the core, 401-lower base, 402-upper pressure seat, 4021-through hole, 403-guide column, 4031-thread groove, 404-first baffle, 4041-bar mouth two, 405-second baffle, 406-dislocation bar, 407-fastening nut, 408-moving block. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0038] It should be noted that, without conflict, the embodiments and features in the embodiments of this application can be combined with each other. The following will refer to the attached Figures 1 to 10 , and will elaborate on this application in combination with the embodiments.

[0039] Embodiment 1: Embodiment 1 discloses a fixing device for the core of a voltage transformer. The following will elaborate on it in combination with the structure of the entire voltage transformer. Refer to the attached Figure 1 , attached Figure 2 and attached Figure 3 . The fixing device for the core of the voltage transformer includes a mounting base 1, a transformer housing 2, a silicon steel sheet core 3, and a core fixing device. Among them, the core fixing device includes two groups of outer end fixing covers 4 for the core symmetrically arranged on the upper surface of the mounting base 1 in the front and back, and the two groups of outer end fixing covers 4 are arranged by moving closer to each other, so as to clamp and arrange the two outer ends of the silicon steel sheet core 3 located in the transformer housing 2.

[0040] The silicon steel sheet core 3 in this Embodiment 1 is a "day" - shaped silicon steel sheet core, which is composed of two superimposed E - shaped silicon steel sheets, and the first coil winding and the second coil winding are wound around the coil sleeve in the silicon steel sheet core 3, and the entire silicon steel sheet core 3 penetrates through the transformer housing 2 from front to back.

[0041] Refer to the attached Figure 6 , attached Figure 7 and attached Figure 8 . Each of the two groups of outer end fixing covers 4 includes a lower base 401 and an upper pressing seat 402. At both ends of the lower base 401, there are vertically upward - connected guide columns 403. The guide columns 403 can pass through the corresponding round holes in the silicon steel sheet core 3 to position the silicon steel sheet core 3, and a threaded groove 4031 is opened at the upper end of the guide column 403. Then, a first baffle 404 is connected to the outer edge of the upper surface of the lower base 401, and a plurality of strip - shaped openings two 4041 are spaced apart on the first baffle 404.

[0042] A through hole 4021 corresponding to the guide column 403 is provided on the upper press seat 402 , and the lower base 401 and the upper press seat 402 are aligned vertically through the action of the guide column 403 and the through hole 4021 . A second baffle 405 is connected to the outer edge of the lower surface of the upper pressure seat 402, and the second baffle 405 is connected to an offset strip 406 aligned with each strip opening 4041, and when setting, the width and length of the strip opening 4041 are set to be the same as the width and length of the offset strip 406, so that the offset strip 406 is inserted into the strip opening 4041 and can be adjusted between the two according to the thickness of the silicon steel sheet core 3, and then a fastening nut 407 is screwed on the guide column 403 above the upper pressure seat 402. By screwing the fastening nut 407, the upper pressure seat 402 can be pressed downward, so that the entire silicon steel sheet core 3 is compressed vertically on the one hand, and the silicon steel sheet core 3 is restricted longitudinally and transversely to prevent it from loosening.

[0043] In the specific arrangement, the two sets of core outer end fixing covers 4 are arranged close to each other along the upper surface of the mounting base 1. Figure 3 , Attachment Figure 4 and attached Figure 8 First, a longitudinally arranged strip moving groove 101 is opened on the upper surface of the mounting base 1, and a bidirectional screw rod 102 is rotatably connected in the strip moving groove 101, and the thread grooves at the front and rear ends of the bidirectional screw rod 102 are arranged in opposite directions. Then, a moving block 408 matching the strip moving groove 101 is connected to the lower surface of the lower base 401 in each set of core outer end fixing cover 4, and a threaded hole matching the bidirectional screw rod 102 is opened on the moving block 408, and one end of the bidirectional screw rod 102 is extended out of the side of the mounting base 1, and a twisting block 103 is connected to the extended outer end of the bidirectional screw rod 102. The above-mentioned manually rotating screw block 103 causes the bidirectional screw rod 102 to rotate in the strip movable groove 101, and then the threaded hole on the movable block 408 cooperates with the bidirectional screw rod 102 to make the two movable blocks 408 approach each other along the strip movable groove 101, thereby realizing that the two groups of core outer end fixing covers 4 are approaching each other along the upper surface of the mounting base 1, and the silicon steel sheet core 3 installed in the transformer housing 2 is clamped and fixed.

[0044] In addition, for the specific arrangement between the transformer housing 2 and the mounting base 1, please refer to the attached Figure 1 , Attachment Figure 4 and attached Figure 5, the positive electrode terminal 202 and the negative electrode terminal 203 are respectively arranged on the left and right sides of the upper end of the transformer housing 2, which is a conventional technical solution and will not be described in detail. The transformer housing 2 in this embodiment is a detachable installation structure with the mounting base 1. When specifically arranged, two symmetrically arranged strip openings 104 are firstly opened at the left and right ends of the upper surface of the mounting base 1, and a strip limiting groove 1041 is opened at the lower end of the strip opening 104. A bolt and nut connector 105 is arranged in each strip opening 104. Then, side strips 201 are connected to the lower ends of the left and right sides of the transformer housing 2, and connection holes 2011 matching the bolt and nut connector 105 are opened on the side strips 201. In order to ensure the installation stability of the transformer housing 2, at least two bolt and nut connectors 105 are arranged in each strip opening 104 in this embodiment.

[0045] Embodiment 2: Embodiment 2 discloses a voltage transformer core fixing device, which is described in detail below in conjunction with the structure of the entire voltage transformer. Figure 1 , Attachment Figure 2 and attached Figure 3 The voltage transformer core fixing device comprises a mounting base 1, a transformer housing 2, a silicon steel sheet core 3 and a core fixing device. The core fixing device comprises two sets of core outer end fixing covers 4 symmetrically arranged on the upper surface of the mounting base 1, and the two sets of core outer end fixing covers 4 are arranged by moving close to each other, so as to clamp the two outer ends of the silicon steel sheet core 3 located in the transformer housing 2.

[0046] Reference Figure 6 , Attachment Figure 7 and attached Figure 8 The two sets of core outer end fixing covers 4 each include a lower base 401 and an upper pressure seat 402. The two ends of the lower base 401 are fixedly connected with guide posts 403 vertically arranged upward, and a threaded groove 4031 is provided at the upper end of the guide post 403. Then, a first baffle 404 is connected to the outer edge of the upper surface of the lower base 401, and a plurality of strip openings 4041 are provided on the first baffle 404 at intervals.

[0047] A through hole 4021 corresponding to the guide post 403 is provided on the upper pressing seat 402. The lower base 401 and the upper pressing seat 402 are arranged vertically aligned through the interaction of the guide post 403 and the through hole 4021. A second baffle 405 is connected to the outer edge of the lower surface of the upper pressing seat 402. A misaligned strip 406 aligned with each second strip-shaped opening 4041 is connected to the second baffle 405. When setting, the width and length of the second strip-shaped opening 4041 are set to be the same as the width and length of the misaligned strip 406, so that the misaligned strip 406 can be adjusted with the thickness of the silicon steel sheet core 3 when inserted into the second strip-shaped opening 4041. Then, a fastening nut 407 is screwed onto the guide post 403 above the upper pressing seat 402. By turning the fastening nut 407, the upper pressing seat 402 can be pressed downward, thereby pressing the entire silicon steel sheet core 3 tightly in the vertical direction, and restricting the silicon steel sheet core 3 in the longitudinal and transverse directions to prevent it from loosening.

[0048] When specifically setting, the specific scheme of the two groups of outer end fixing covers 4 of the iron cores approaching each other along the upper surface of the mounting base 1 can be referred to in Appendix Figure 3 , Appendix Figure 4 and Appendix Figure 8 , First, a longitudinally arranged strip-shaped moving groove 101 is opened on the upper surface of the mounting base 1. A bidirectional lead screw 102 is rotatably connected in the strip-shaped moving groove 101, and the thread groove directions at the front and rear ends of the bidirectional lead screw 102 are set to be opposite. Then, a moving block 408 matching the strip-shaped moving groove 101 is connected to the lower surface of the lower base 401 in each group of outer end fixing covers 4 of the iron cores. A threaded hole matching the bidirectional lead screw 102 is opened on the moving block 408, and one end of the bidirectional lead screw 102 is extended out of the side surface of the mounting base 1, and a turning block 103 is connected to the extended outer end of the bidirectional lead screw 102. By manually rotating the turning block 103, the bidirectional lead screw 102 rotates in the strip-shaped moving groove 101, and then through the cooperation of the threaded hole on the moving block 408 and the bidirectional lead screw 102, the two moving blocks 408 approach each other along the strip-shaped moving groove 101, so as to realize the two groups of outer end fixing covers 4 of the iron cores approaching each other along the upper surface of the mounting base 1, and clamping and fixing the silicon steel sheet core 3 installed in the transformer housing 2.

[0049] Refer to Appendix Fig. 9 , The silicon steel sheet core 3 includes a number of first E-shaped silicon steel sheets 301 stacked neatly up and down and a number of second E-shaped silicon steel sheets 302 stacked neatly up and down, and the two adjacent ends of the first E-shaped silicon steel sheet 301 and the second E-shaped silicon steel sheet 302 are connected, thus forming a "day"-shaped iron core. At the same time, circular holes 304 for passing through the guide posts 403 are opened on both sides of the outer ends of the first E-shaped silicon steel sheets 301 and both sides of the outer ends of the second E-shaped silicon steel sheets 302, so as to be used for the positioning of the silicon steel sheet core 3.

[0050] Reference Figure 1 , Attachment Figure 4 and attached Figure 5 , the positive electrode terminal 202 and the negative electrode terminal 203 are respectively arranged on the left and right sides of the upper end of the transformer housing 2, which is a conventional technical solution and will not be described in detail. The transformer housing 2 in this embodiment is a detachable installation structure with the mounting base 1. When specifically arranged, two symmetrically arranged strip openings 104 are firstly opened at the left and right ends of the upper surface of the mounting base 1, and a strip limiting groove 1041 is opened at the lower end of the strip opening 104. A bolt and nut connector 105 is arranged in each strip opening 104. Then, side strips 201 are connected to the lower ends of the left and right sides of the transformer housing 2, and connection holes 2011 matching the bolt and nut connector 105 are opened on the side strips 201. In order to ensure the installation stability of the transformer housing 2, at least two bolt and nut connectors 105 are arranged in each strip opening 104 in this embodiment.

[0051] At the same time, side channels 204 for passing through the two ends of the first E-shaped silicon steel sheet 301 are opened at the left and right ends of the transformer housing 2, and an intermediate channel 205 for passing through the coil sleeve 303 on the first E-shaped silicon steel sheet 301 is opened at the middle position of the transformer housing 2, and the intermediate channel 205 is connected to the inner cavity of the transformer housing 2, and the first coil winding and the second coil winding are wound on the coil sleeve 303.

[0052] In order to enhance the stability of the silicon steel sheet core 3 when the whole is connected, the present embodiment also improves the design of the silicon steel sheet core 3 and the transformer housing 2. Fig. 9 and attached Fig.10 The silicon steel sheet core 3 in this embodiment 2 is also provided with L-shaped protrusions 305 extending from both ends of the first E-shaped silicon steel sheet 301 and the second E-shaped silicon steel sheet 302 where they are close to each other. The L-shaped protrusions 305 on the first E-shaped silicon steel sheet 301 and the L-shaped protrusions 305 on the second E-shaped silicon steel sheet 302 are centrally symmetrically arranged when they are close to each other, and a rectangular through groove 306 is formed between the L-shaped protrusions 305 on the first E-shaped silicon steel sheet 301 and the second E-shaped silicon steel sheet 302, and then a rectangular tensioning strip 307 is arranged in the rectangular through groove 306 to achieve a tensioning connection between the two groups of E-shaped silicon steel sheets.

[0053] In the specific setting, both sides of the upper end of the transformer housing 2 are provided with a plug guide socket 206, a crossbeam 207 is connected between the two plug guide sockets 206, and a threaded connection hole 2071 is provided on the crossbeam 207, two rectangular tensioning plugs 307 are arranged along the plug guide socket 206, and a cross bar 308 is connected between the upper ends of the two rectangular tensioning plugs 307, and a connecting bolt 309 matching the threaded connection hole 2071 is threadedly connected on the cross bar 308. The two rectangular tensioning plugs 307 are inserted downwardly into the rectangular through slot 306 in the silicon steel sheet core 3 along the plug guide socket 206, and then the rectangular tensioning plugs 307 are fixed by connecting the connecting bolts 309 with the threaded connection hole 2071.

[0054] Finally, in the present embodiment 2, a rectangular bayonet 3011 is provided at the end of the middle position of the first E-shaped silicon steel sheet 301, and a rectangular protrusion 3021 matching the rectangular bayonet 3011 is extended at the end of the middle position of the second E-shaped silicon steel sheet 302, and the rectangular protrusion 3021 is loosely matched with the rectangular bayonet 3011. When the first E-shaped silicon steel sheet 301 and the second E-shaped silicon steel sheet 302 are connected to form the entire iron core, the cooperation between the rectangular protrusion 3021 and the rectangular bayonet 3011 makes the two have an anti-pull effect, which can further improve the installation stability of the reinforced silicon steel sheet core 3.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A voltage transformer core fixing device, comprising a mounting base (1), a transformer housing (2), a silicon steel sheet core (3) and a core fixing device, characterized in that: The iron core fixing device comprises two sets of iron core outer end fixing covers (4) which are symmetrically arranged on the upper surface of the mounting base (1) in front and back directions, and the two sets of iron core outer end fixing covers (4) are arranged to move close to each other to clamp the two outer ends of the silicon steel sheet iron core (3) located in the transformer housing (2); The core outer end fixing cover (4) comprises a lower base (401) and an upper pressure seat (402), the two ends of the lower base (401) are fixedly connected with vertically upward guide columns (403), and the upper ends of the guide columns (403) are provided with threaded grooves (4031), the outer edge of the upper surface of the lower base (401) is connected with a first baffle (404), a plurality of strip-shaped openings (4041) are spaced apart on the first baffle (404), a through hole (4021) corresponding to the guide column (403) is provided on the upper pressure seat (402), the outer edge of the lower surface of the upper pressure seat (402) is connected with a second baffle (405), and the second baffle (405) is connected with an offset bar (406) aligned with each strip-shaped opening (4041), and a fastening nut (407) is screwed on the guide column (403) above the upper pressure seat (402); The upper surface of the mounting base (1) is provided with a longitudinally arranged strip movable groove (101), a bidirectional screw rod (102) is rotatably connected in the strip movable groove (101), the thread grooves at the front and rear ends of the bidirectional screw rod (102) are arranged in opposite directions, the lower surface of the lower base (401) in each group of the core outer end fixed cover (4) is connected with a movable block (408) matching the strip movable groove (101), the movable block (408) is provided with a threaded hole matching the bidirectional screw rod (102), one end of the bidirectional screw rod (102) is arranged to extend out of the side surface of the mounting base (1), and a twisting block (103) is connected to the extended outer end of the bidirectional screw rod (102); The left and right ends of the upper surface of the mounting base (1) are provided with two symmetrically arranged strip openings (104), the lower ends of the strip openings (104) are provided with strip limiting grooves (1041), each of the strip openings (104) is provided with a bolt and nut connecting piece (105), the lower ends of the left and right side surfaces of the transformer housing (2) are connected with side strip plates (201), and the side strip plates (201) are provided with connecting holes (2011) matching the bolt and nut connecting pieces (105).

2. The voltage transformer core fixing device according to claim 1, characterized in that: There are no less than two bolt and nut connecting pieces (105) arranged in each of the strip-shaped openings (104).

3. The voltage transformer core fixing device according to claim 1, characterized in that: A positive electrode connection terminal (202) and a negative electrode connection terminal (203) are respectively arranged on the left and right sides of the upper end of the transformer housing (2).

4. The voltage transformer core fixing device according to claim 1, characterized in that: The width and length of the second strip-shaped opening (4041) are set to be the same as the width and length of the offset strip (406).

5. The voltage transformer core fixing device according to claim 1, characterized in that: The silicon steel sheet core (3) comprises a plurality of first E-shaped silicon steel sheets (301) neatly stacked up and down and a plurality of second E-shaped silicon steel sheets (302) neatly stacked up and down, the first E-shaped silicon steel sheets (301) and the second E-shaped silicon steel sheets (302) being connected at two proximal ends thereof, and circular holes (303) for passing through guide posts (403) are provided on both sides of the outer ends of the first E-shaped silicon steel sheets (301) and the outer ends of the second E-shaped silicon steel sheets (302). 4), side channels (204) for passing through the two ends of the first E-shaped silicon steel sheet (301) are provided at the left and right ends of the transformer housing (2), and a middle channel (205) for passing through the coil sleeve (303) on the first E-shaped silicon steel sheet (301) is provided at the middle position of the transformer housing (2), and the middle channel (205) is communicated with the inner cavity of the transformer housing (2), and the coil sleeve (303) is wound with a first coil winding and a second coil winding.

6. The voltage transformer core fixing device according to claim 5, characterized in that: L-shaped protrusions (305) extend from both ends of the first E-shaped silicon steel sheet (301) and the second E-shaped silicon steel sheet (302) that are close to each other. The L-shaped protrusions (305) on the first E-shaped silicon steel sheet (301) and the L-shaped protrusions (305) on the second E-shaped silicon steel sheet (302) are arranged symmetrically to the center when they are close to each other, and a rectangular through groove (306) is formed between the L-shaped protrusions (305) on the first E-shaped silicon steel sheet (301) and the second E-shaped silicon steel sheet (302), and a rectangular tensioning insert (307) is arranged in the rectangular through groove (306).

7. The voltage transformer core fixing device according to claim 6, characterized in that: Insertion bar guide sockets (206) are provided on both sides of the upper end of the transformer housing (2); a crossbeam (207) is connected between the two insertion bar guide sockets (206); a threaded connection hole (2071) is provided on the crossbeam (207); two rectangular tensioning insertion bars (307) are provided along the insertion bar guide sockets (206); a crossbar (308) is connected between the upper ends of the two rectangular tensioning insertion bars (307); and a connection bolt (309) matching the threaded connection hole (2071) is threadedly connected to the crossbar (308).

8. The voltage transformer core fixing device according to any one of claims 5 to 7, characterized in that: A rectangular bayonet (3011) is provided at the end at the middle position of the first E-shaped silicon steel sheet (301), and a rectangular protrusion (3021) matching the rectangular bayonet (3011) extends from the end at the middle position of the second E-shaped silicon steel sheet (302), and the rectangular protrusion (3021) is clearance-matched with the rectangular bayonet (3011).

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