On-load voltage regulating switch

Abstract

The present invention relates to an on-load voltage regulating switch, comprising a frame, a voltage regulating module, a permanent magnet mechanism, a slot wheel mechanism and a reduction motor, wherein the voltage regulating module comprises a mounting plate, a gear selection mechanism and a circuit switching mechanism, the reduction motor drives the gear selection mechanism fixed on the mounting plate to move through a gear shaft running through three groups of voltage regulating modules, the slot wheel mechanism comprises a gear signal dial and a gear selection dial fixed on the output shaft of the reduction motor, and a gear signal slot wheel and a gear selection slot wheel fixed at one end of the gear shaft, the output shaft of the reduction motor drives the gear signal dial and the gear selection dial to rotate, and the gear signal dial and the gear selection dial drive the gear signal slot wheel and the gear selection slot wheel respectively. The invention has the advantages of modularization, small size and stable performance.

Description

Technical Field

[0001] The invention relates to a tap switch, in particular to an on-load voltage regulating switch. Background Art

[0002] Due to the reliable vacuum arc extinguishing, long contact life, no oil pollution and maintenance. At present, some domestic manufacturers are exploring the use of vacuum OLTC as voltage regulation in small-capacity oil-immersed on-load voltage regulation distribution transformers. However, the current vacuum OLTC still has unsatisfactory structural performance. The cylinder-mounted vacuum pressure-reducing adopts a mechanical transmission mechanism with spring energy storage and rapid release. The structure is mostly a composite selection switch structure. Although the voltage regulation range can meet the linear 9 tap positions (±4×2.5%) requirements, the disadvantage is that it uses an extra switch oil chamber, the manufacturing cost is high, and it is installed vertically on one side of the distribution transformer, which occupies a large space. The horizontally installed vacuum pressure-reducing OLTC, although it takes up less space inside the distribution transformer and can also use permanent magnet mechanism vacuum switching, is limited by the fact that the permanent magnet mechanism can only operate reciprocatingly. The number of tap positions of the voltage-regulating OLTC is too small, only 3 to 5 tap positions, which cannot meet the voltage regulation range requirements of the GB / T6451 standard. The vacuum permanent magnet OLTC (oil-immersed on-load voltage-changing switch invention technology: invention patent number 201611155045.1) developed by Zhejiang Tenglong Electric Co., Ltd. in 2016 pioneered the use of a single-resistance single-vacuum switching circuit and achieved 9 tap positions (±4×2.5%), which better meets the needs of the intelligent development of distribution transformers.

[0003] However, the current vacuum permanent magnet OLTC has a large switch size due to the complex circuit principle and switch structure, and still occupies a large space inside the transformer, which affects the transformer design layout and restricts the improvement of the economy of the on-load vacuum air-conditioning transformer. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a modular, easy-to-install, and stable-performance on-load voltage regulating switch.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A load voltage regulating switch comprises a frame, a voltage regulating module, a permanent magnet mechanism, a groove wheel mechanism and a reduction motor. Three groups of voltage regulating modules are arranged on the frame at intervals. The voltage regulating module comprises a mounting plate, a gear selection mechanism and a circuit switching mechanism. The circuit switching mechanism comprises a switching contact mechanism and a vacuum tube respectively fixed on both sides of the mounting plate. The permanent magnet mechanism and the reduction motor are arranged on the frame on one side of the voltage regulating module, and the permanent magnet mechanism drives the vacuum tube to be closed or disconnected through a voltage regulating shaft running through the three groups of voltage regulating modules. At the same time, the voltage regulating shaft drives the switching contact mechanism to move synchronously. The reduction motor drives the gear selection mechanism fixed on the mounting plate to move through the gear shaft running through the three groups of voltage regulating modules. The groove wheel mechanism comprises a gear signal dial and a gear selection dial fixed on the output shaft of the reduction motor, and a gear signal groove wheel and a gear selection groove wheel fixed on one end of the gear shaft. The output shaft of the reduction motor drives the gear signal dial and the gear selection dial to rotate, and the gear signal dial and the gear selection dial drive the gear signal groove wheel and the gear selection groove wheel respectively.

[0007] As a preferred solution, a support is fixed on the gear signal groove wheel through a cover plate, and a gear plate is fixed on the frame through a bracket. When the position of the support on the gear plate changes, a corresponding signal is sent to instruct the permanent magnet mechanism to operate.

[0008] As a preferred embodiment, the gear signal slot wheel and the gear selection slot wheel both include a shift dial and a positioning plate that are fixedly arranged at intervals, half a circle of teeth are arranged at intervals on the shift dial, and limiting grooves are formed between adjacent teeth, and a plurality of arc-shaped notches are arranged at positions corresponding to the teeth on the positioning plate, a shift lever is arranged on one side of the gear signal dial and the gear selection dial, and a locking block is arranged on the other side, the cross-sectional shape of the locking block matches the arc-shaped notch, the locking block is stuck in the arc-shaped notch to make the gear signal slot wheel or the gear selection slot wheel stationary, and when the gear signal dial or the gear selection dial rotates, the locking block rotates out of the arc-shaped notch, and the shift lever drives the gear signal slot wheel or the gear selection slot wheel to rotate.

[0009] As a preferred solution, an inertia flywheel is fixed to one end of the voltage regulating shaft, and a gear is fixed to the other end, and the permanent magnet mechanism drives the voltage regulating shaft through the meshing of the rack and the gear.

[0010] As a preferred solution, a signal contact assembly is also provided on the rack, and a signal contact assembly is also provided on the rack corresponding to the position of the rack.

[0011] As a preferred embodiment, the switching contact mechanism includes a contact frame, a switching moving contact M and a switching moving contact K. The two contact frames are fixed at intervals by a first pillar, and a plurality of clip contacts are staggered on the two contact frames. The two contact frames are fixed on the mounting plate at intervals by a second pillar. The switching moving contact M and the switching moving contact K are fixed on the voltage regulating shaft, and the switching moving contact M and the switching moving contact K respectively cooperate with the clip contacts on the corresponding contact frames.

[0012] As a preferred embodiment, multiple clip contacts are distributed in an arc shape, the switching moving contact M and the switching moving contact K are both arc-shaped contacts, and the switching moving contact M or the switching moving contact K is always in contact with one of the clip contacts, and the switching moving contact M or the switching moving contact K switches among the other multiple clip contacts as the voltage regulating shaft moves.

[0013] As a preferred embodiment, three cams are provided on the pressure regulating shaft, and a lever assembly is provided on one side of each cam. The lever assembly includes a lever fixed to the mounting plate through a support shaft and a pull rod fixed to one end of the lever. The other end of the lever is in contact with the cam, and the cam drives the pull rod to move to disconnect or close the vacuum tube.

[0014] As a preferred embodiment, the gear selection mechanism includes a fixed contact, a fixed contact piece and a gear moving contact, the fixed contact and the fixed contact piece are fixed on the mounting plate, the gear moving contact is fixed on the gear shaft through a fixing sleeve, one end of the gear moving contact is always in contact with the fixed contact piece, and the other end switches between multiple fixed contacts.

[0015] As a preferred solution, fixed contacts and fixed contact sheets are fixed on both sides of the mounting plate, a plurality of fixed contacts are distributed at intervals in an arc shape, and the positions of the fixed contacts on both sides are staggered.

[0016] The invention adopts a single-resistance single-vacuum circuit, and only one vacuum tube is used for each phase to achieve full vacuum arc extinguishing, which greatly reduces the amount of vacuum tubes used and improves the economic efficiency of the product; and the invention adopts a modular design: the whole machine adopts a modular design, and each phase of the switch is designed as an independent module. At the same time, modular manufacturing and assembly processes are also adopted, which effectively reduces the production cost of the switch and improves the economic efficiency.

[0017] The voltage regulating module of the present invention adopts a combined design, and the gear selection is driven by the reduction motor to drive the selector, and then the gear switching is driven by the permanent magnet operating mechanism to realize the gear switching. The reduction motor selects the gear through the groove wheel mechanism, and has a locking function after the gear selection is in place, so as to avoid the gear change during the circuit switching process. Damage to the equipment.

[0018] The switching contact mechanism of the present invention adopts a novel clip-type design and a reasonably designed contact layout structure, so that the structure is more compact and the volume of contacts with the same current-carrying capacity is smaller.

[0019] The present invention redesigns the vacuum permanent magnet, reduces the switch volume, reduces the switch height, and thus reduces the transformer oil tank height, thereby effectively reducing the transformer manufacturing cost and improving economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention.

[0021] Figure 2 It is a schematic structural diagram of the reduction motor, permanent magnet mechanism and grooved wheel mechanism of the present invention.

[0022] Figure 3 It is a structural schematic diagram of one side of the voltage regulating module of the present invention.

[0023] Figure 4 It is a structural schematic diagram of the other side of the voltage regulating module of the present invention.

[0024] Figure 5 It is a schematic diagram of the explosion structure of the voltage regulating module of the present invention.

[0025] Figure 6 It is a schematic diagram of the exploded structure of the switching contact mechanism of the present invention.

[0026] Figure 7 It is a schematic structural diagram of one side of the gear signal groove wheel or the gear selection groove wheel of the present invention.

[0027] Figure 8 It is a schematic structural diagram of the other side of the gear signal groove wheel or the gear selection groove wheel of the present invention.

[0028] Fig. 9 This is a diagram showing the operation process of the switching contact mechanism of the voltage regulating module of the present invention.

[0029] Fig.10 It is a timing diagram of the switching contact mechanism of the voltage regulating module of the present invention. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0031] like Figures 1 to 6A miniaturized on-load voltage regulating switch shown in the figure comprises a frame, a voltage regulating module 11, a permanent magnet mechanism 3 and a reduction motor 4. Three groups of voltage regulating modules 11 are arranged on the frame at intervals. The voltage regulating module 11 comprises a mounting plate 111, a gear selection mechanism and a circuit switching mechanism. The circuit switching mechanism comprises a switching contact mechanism and a vacuum tube 112 respectively fixed on both sides of the mounting plate 111. The permanent magnet mechanism 3 and the reduction motor 4 are arranged on the frame on one side of the voltage regulating module 11, and the permanent magnet mechanism 3 drives the vacuum tube 112 to be closed or opened through the voltage regulating shaft 12 that runs through the three groups of voltage regulating modules 11. When the voltage regulating shaft 12 drives the switching contact mechanism to move synchronously, the reduction motor 4 drives the gear selection mechanism fixed on the mounting plate 111 to move through the gear shaft 13 that runs through the three groups of voltage regulating modules 11, the switching contact mechanism includes a contact frame 1112, a switching movable contact M1114 and a switching movable contact K1121, the two contact frames 1112 are fixed at intervals by a first pillar 1116, a plurality of clip contacts 1113 are staggered on the two contact frames 1112, the two contact frames 1112 are fixed at intervals on the mounting plate 111 by second pillars 1117, the switching movable contacts M1114 and K1121 are fixed on the voltage regulating shaft 12, and the switching movable contacts M1114 and K1121 respectively cooperate with the clip contacts 1113 on the corresponding contact frames 1112.

[0032] Multiple clip contacts 1113 are distributed in an arc shape, and the switching moving contact M 1114 and the switching moving contact K1121 are both arc-shaped contacts, and the switching moving contact M 1114 or the switching moving contact K1121 is always in contact with one of the clip contacts 1113, and the switching moving contact M 1114 or the switching moving contact K1121 switches among the other multiple clip contacts 1113 as the voltage regulating shaft 12 moves.

[0033] The pressure regulating shaft 12 is provided with three cams 117, and a lever assembly is also provided on one side of each cam 117, and the lever assembly includes a lever 115 fixed to the mounting plate 111 through a support shaft 114 and a pull rod 113 fixed to one end of the lever 115, and the other end of the lever 115 contacts the cam 117, and the cam 117 drives the pull rod 113 to move to disconnect or close the vacuum tube 112. The lever 115 is L-shaped, and a roller 116 is also provided at the end of the lever 115 that contacts the cam 117. A pressure regulating right-angle support plate is also provided on the second mounting plate, and the pull rod passes through the pressure regulating right-angle support plate.

[0034] The gear selection mechanism includes a fixed contact 118, a fixed contact piece 119 and a gear moving contact 1110. The fixed contact 118 and the fixed contact piece 119 are fixed on the mounting plate 111. The gear moving contact 1110 is fixed on the gear rotating shaft 13 through a fixing sleeve 1111. One end of the gear moving contact 1110 is always in contact with the fixed contact piece 119, and the other end switches between multiple fixed contacts 118. Fixed contacts 118 and fixed contact pieces 119 are fixed on both sides of the mounting plate 111. Multiple fixed contacts 118 are spaced apart in an arc shape, and the positions of the fixed contacts 118 on both sides are staggered.

[0035] The contact frame 1112 is also provided with a plurality of lead-out connectors 1115, which are respectively connected to the corresponding clip contacts 1113. The clip contacts 1113 are fixed to both sides of the contact frame 1112 by the cooperation of the pins 1119 and the caps 1118, and a spring 1120 is provided between the clip contacts 1113 and the pins 1119 or the caps 1118.

[0036] An inertia flywheel 14 is fixed to one end of the voltage regulating shaft 12, and a gear is fixed to the other end. The permanent magnet mechanism 3 drives the voltage regulating shaft 12 through the meshing of the rack 31 and the gear. A signal contact assembly 32 is also provided on the rack 31, and a signal contact assembly 32 is also provided on the frame corresponding to the position of the rack 31.

[0037] like Figure 2 , Figure 7 and Figure 8 As shown, the present invention also includes a slot wheel mechanism, which includes a gear signal dial 18 and a gear selection dial 17 fixed on the output shaft of the reduction motor 4, and a gear signal slot wheel 16 and a gear selection slot wheel 15 fixed on one end of the gear rotating shaft 13. The output shaft of the reduction motor 4 drives the gear signal dial 18 and the gear selection dial 17 to rotate, and the gear signal dial 18 and the gear selection dial 17 drive the gear signal slot wheel 16 and the gear selection slot wheel 15 respectively.

[0038] A support 193 is also fixed on the gear signal groove wheel 16 through a cover plate 194, and a gear plate 192 is fixed on the frame through a bracket 191. When the position of the support 193 on the gear plate 192 changes, a corresponding signal is sent to instruct the permanent magnet mechanism to act.

[0039] The gear signal slot wheel 16 and the gear selection slot wheel 15 both include a shift plate 151 and a positioning plate 152 which are fixedly arranged at intervals of 151. The shift plate 151 is provided with half-circle teeth 154 at intervals, and a limiting groove 155 is formed between adjacent teeth 154. A plurality of arc-shaped notches 153 are provided at positions corresponding to the teeth 154 on the positioning plate 152. A shift lever is provided on one side of the gear signal dial 18 and the gear selection dial 17, and a locking block is provided on the other side. The cross-sectional shape of the locking block matches the arc-shaped notch. The locking block is stuck in the arc-shaped notch 153 to make the gear signal slot wheel 16 or the gear selection slot wheel 15 stationary. When the gear signal dial 18 or the gear selection dial 17 rotates, the locking block rotates out of the arc-shaped notch 153, and the shift lever drives the gear signal slot wheel 16 or the gear selection slot wheel 15 to rotate.

[0040] The frame includes a first frame for installing the voltage regulating module 11 and a second frame for installing the reduction motor and the permanent magnet mechanism. The first frame and the second frame are fixed by a connecting plate 28. The groove wheel mechanism is arranged between the first frame and the second frame. The first frame is surrounded and fixed by a baffle 21, a first insulating rod 23, a second insulating rod 24 and a partition 22. The second frame is surrounded and fixed by a first mechanism fixing plate 25, a second mechanism fixing plate 26 and a support rod 27. A plurality of wiring screws 241 are also provided on the outer side of the second insulating rod 24.

[0041] Voltage Regulator Operation Instructions

[0042] like Fig. 9 and Fig.10 As shown, the switching contact mechanism of the three sets of voltage regulating devices includes K contact, KⅠ contact, KⅡ contact and M contact, MⅢ contact, MⅣ contact. The voltage regulating shaft of the switching contact mechanism moves synchronously according to the voltage regulating action change program diagram. The steps are as follows:

[0043] 1. Tap 1 works, the second vacuum tube V is closed, the K contact is connected to the KⅠ contact, and the M contact is connected to the MⅢ contact.

[0044] 2. The K contact and the KⅠ contact remain conductive, the M contact and the MⅢ contact remain conductive, the second vacuum tube V is disconnected, and the transition resistor R is connected.

[0045] 3. K contact switches. After K contact and KⅠ contact are disconnected, K contact and KⅡ contact are connected, M contact and MⅢ contact remain connected, and the second vacuum tube V is disconnected.

[0046] 4. Tap 1 and tap 2 are bridged, K contact and KⅡ contact are connected, M contact and MⅢ contact remain connected, and the second vacuum tube V is closed.

[0047] 5. The M contact is connected to the MⅢ contact and the MⅣ contact, the K contact is disconnected from the KⅡ contact, and the second vacuum tube V is closed.

[0048] 6. The M contact is disconnected from the MⅢ contact, the M contact is kept connected with the MⅣ contact, the K contact is disconnected from the KⅡ contact, and the second vacuum tube V is closed.

[0049] 7. Tap 2 works, the M contact and the MⅣ contact are disconnected, the K contact and the KⅡ contact are connected, and the second vacuum tube V is disconnected.

[0050] The drive voltage regulating shaft completes the conversion operation once every rotation. Once the vacuum OLTC changes in the opposite direction (N→1), the tap selector does not move, and only the switch completes the conversion operation.

[0051] It should be noted that the above embodiments are only representative examples of the present invention. The present invention can also have many variations. Any simple modification, equivalent changes and modifications made to the above embodiments based on the essence of the present invention should be considered to belong to the protection scope of the present invention.

Claims

1. An on-load voltage regulating switch, characterized in that: The invention comprises a frame, a voltage regulating module (11), a permanent magnet mechanism (3), a groove wheel mechanism and a reduction motor (4); three groups of voltage regulating modules (11) are arranged on the frame at intervals; the voltage regulating module (11) comprises a mounting plate (111), a gear selection mechanism and a circuit switching mechanism; the circuit switching mechanism comprises a switching contact mechanism and a vacuum tube (112) respectively fixed on both sides of the mounting plate (111); the permanent magnet mechanism (3) and the reduction motor (4) are arranged on the frame on one side of the voltage regulating module (11); the permanent magnet mechanism (3) drives the vacuum tube (112) to close or open via a voltage regulating shaft (12) passing through the three groups of voltage regulating modules (11); and the voltage regulating shaft (12) drives the switching contact mechanism to close or open. The head mechanism moves synchronously, the reduction motor (4) drives the gear selection mechanism fixed on the mounting plate (111) to move through the gear shaft (13) that runs through the three groups of voltage regulating modules (11), the groove wheel mechanism comprises a gear signal dial (18) and a gear selection dial (17) fixed on the output shaft of the reduction motor (4), and a gear signal groove wheel (16) and a gear selection groove wheel (15) fixed on one end of the gear shaft (13), the output shaft of the reduction motor (4) drives the gear signal dial (18) and the gear selection dial (17) to rotate, and the gear signal dial (18) and the gear selection dial (17) respectively drive the gear signal groove wheel (16) and the gear selection groove wheel (15); The gear signal groove wheel (16) and the gear selection groove wheel (15) both comprise a shift plate (151) and a positioning plate (152) which are fixedly arranged at intervals. The shift plate (151) is provided with teeth (154) which are arranged at intervals of half a circle. Position limiting grooves (155) are formed between adjacent teeth (154). The positioning plate (152) is provided with a plurality of arc-shaped notches (153) at positions corresponding to the teeth (154). A lever is provided on one side of the disk (17), and a locking block is provided on the other side. The cross-sectional shape of the locking block matches the arc-shaped notch. The locking block is stuck in the arc-shaped notch (153) so that the gear signal groove wheel (16) or the gear selection groove wheel (15) is stationary. When the gear signal dial (18) or the gear selection dial (17) rotates, the locking block rotates out of the arc-shaped notch (153), and the lever drives the gear signal groove wheel (16) or the gear selection groove wheel (15) to rotate. An inertia flywheel (14) is fixed to one end of the voltage regulating shaft (12), and a gear is fixed to the other end; the permanent magnet mechanism (3) drives the voltage regulating shaft (12) through the meshing of the rack (31) and the gear; Fixed contacts (118) and fixed contact sheets (119) are fixed on both sides of the mounting plate (111); a plurality of fixed contacts (118) are distributed at intervals in an arc shape, and the positions of the fixed contacts (118) on both sides are staggered.

2. The on-load voltage regulating switch according to claim 1, characterized in that: A support (193) is also fixed on the gear signal groove wheel (16) via a cover plate (194), and a gear plate (192) is fixed on the frame body via a bracket (191). When the position of the support (193) on the gear plate (192) changes, a corresponding signal is sent to instruct the permanent magnet mechanism to operate.

3. The on-load voltage regulating switch according to claim 1, characterized in that: The rack (31) is also provided with a signal contact assembly (32), and a frame corresponding to the position of the rack (31) is also provided with a signal contact assembly (32).

4. The on-load voltage regulating switch according to claim 1, characterized in that: The switching contact mechanism comprises a contact frame (1112), a switching movable contact M (1114) and a switching movable contact K (1121); the two contact frames (1112) are fixed at intervals by a first pillar (1116); a plurality of clip contacts (1113) are arranged alternately on the two contact frames (1112); the two contact frames (1112) are fixed at intervals on a mounting plate (111) by a second pillar (1117); the switching movable contact M (1114) and the switching movable contact K (1121) are fixed on a voltage regulating shaft (12); and the switching movable contact M (1114) and the switching movable contact K (1121) respectively cooperate with the clip contacts (1113) on the corresponding contact frames (1112).

5. The on-load voltage regulating switch according to claim 4, characterized in that: A plurality of clip contacts (1113) are distributed in an arc shape, the switching movable contact M (1114) and the switching movable contact K (1121) are both arc-shaped contacts, and the switching movable contact M (1114) or the switching movable contact K (1121) is always in contact with one of the clip contacts (1113), and the switching movable contact M (1114) or the switching movable contact K (1121) switches among the other plurality of clip contacts (1113) as the voltage regulating shaft (12) moves.

6. The on-load voltage regulating switch according to claim 1, characterized in that: Three cams (117) are provided on the pressure regulating shaft (12), and a lever assembly is also provided on one side of each cam (117). The lever assembly includes a lever (115) fixed to the mounting plate (111) via a support shaft (114) and a pull rod (113) fixed to one end of the lever (115). The other end of the lever (115) is in contact with the cam (117), and the cam (117) drives the pull rod (113) to move to disconnect or close the vacuum tube (112).

7. The on-load voltage regulating switch according to claim 1, characterized in that: The gear selection mechanism comprises a fixed contact (118), a fixed contact piece (119) and a gear moving contact (1110); the fixed contact (118) and the fixed contact piece (119) are fixed on a mounting plate (111); the gear moving contact (1110) is fixed on a gear rotating shaft (13) via a fixing sleeve (1111); one end of the gear moving contact (1110) is always in contact with the fixed contact piece (119), and the other end switches between a plurality of fixed contacts (118).

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