Four-station oil-immersed high-voltage load switch

Abstract

The utility model discloses a four-station oil-immersed high-voltage load switch, which comprises a base, a switch shaft and an operating mechanism, at least one moving contact assembly is arranged on the switch shaft along the axial direction; four static contacts matched with the moving contact assembly are uniformly arranged on the base along the circumferential direction at intervals; the moving contact assembly comprises two semi-circular contact plates which are distributed up and down, and the two contact plates are connected through three fixed rods which are arranged at intervals, so that three contact notches are formed between the two contact plates, and the thickness of the contact notches is smaller than that of the static contact; the fixing rod is sleeved with a spring. The inner end of the contact plate is embedded in the connecting block, and the connecting block is sleeved outside the switch shaft. During installation, the switch shaft and the moving contact assembly can be fixed only by forming a hole in the middle of the connecting block and inserting the switch shaft into the connecting block, the requirement for installation precision is low, and the machining process is simple; and the assembled load switch is good in integrity, high in working stability and long in mechanical service life.

Description

Technical Field

[0001] The utility model relates to the technical field of load switches, in particular to a four-position oil-immersed high-voltage load switch. Background Art

[0002] A load switch is a type of electrical switch between a circuit breaker and an isolating switch. It features a simple arc-extinguishing mechanism and can interrupt rated load current and a certain level of overload current, but cannot interrupt short-circuit current. It is a widely used transmission and distribution device in modern power systems. Oil-immersed high-voltage load switches are installed within combined transformers. As a control component, they primarily control the connection and disconnection of high-voltage power.

[0003] See also Figures 1 to 3 In the existing industry, an oil-immersed high-voltage load switch generally includes a base 1, a switch shaft 2 disposed inside the base 1, and an operating mechanism 3 in transmission connection with the switch shaft 2; the switch shaft 2 is provided with a moving contact assembly 4, and correspondingly, the base 1 is provided with a static contact 5 for use with the moving contact assembly 4; the moving contact assembly 4 is T-shaped. During use, the operating mechanism 3 drives the switch shaft 2 to rotate, and in turn drives the moving contact assembly 4 to rotate, so that the moving contact assembly 4 is connected or disconnected with the static contact 5. When assembling an oil-immersed high-voltage load switch of this structure, the moving contact assembly needs to be disposed inside the switch shaft, and holes need to be drilled in the switch shaft so that the three ends of the moving contact assembly extend from the corresponding holes. In this case, the installation precision requirements are high, resulting in low production efficiency of the product. In addition, the overall structure of the oil-immersed high-voltage load switch of this structure is relatively complex and heavy, resulting in poor stability during operation and prone to failure. Utility Model Content

[0004] The present application provides a four-position oil-immersed high-voltage load switch to overcome the above-mentioned problems existing in the prior art. In the four-position oil-immersed high-voltage load switch of the present application, the movable contact assembly adopts a semicircular structure, including a contact plate and a connecting block, and the end of the contact plate is embedded in the connecting block. During installation, it is only necessary to drill a hole in the middle of the connecting block and then insert the switch shaft into the connecting block to achieve the fixation of the switch shaft and the movable contact assembly. In this case, no additional locating pins, fixing bolts, or other connecting parts are required. The installation precision requirements are low and the processing technology is simple. In addition, the assembled load switch has good integrity, high working stability, and long mechanical life.

[0005] The technical solution of this application is:

[0006] A four-position oil-immersed high-voltage load switch comprises a base, a switch shaft arranged inside the base, and an operating mechanism connected to the switch shaft in a transmission manner; at least one moving contact assembly is provided axially on the switch shaft, and correspondingly, four static contacts for use with the moving contact assembly are evenly spaced circumferentially on the base; the moving contact assembly comprises two semicircular contact plates distributed upper and lower, and the two contact plates are connected by three fixed rods arranged at intervals, thereby forming three contact slots between the two contact plates; a spring is sleeved on the fixed rod; the thickness of the contact slot is less than that of the static contact; the moving contact assembly is connected to the static contact through the contact slot; the inner end of the contact plate is embedded in the connecting block; the connecting block is sleeved outside the switch shaft.

[0007] Compared with the prior art, the four-position oil-immersed high-voltage load switch of the present application has improved the moving contact assembly, and the original T-shaped moving contact assembly is designed into a semicircular structure, including a contact plate and a connecting block, and the end of the contact plate is embedded in the connecting block; during installation, it is only necessary to open a hole in the middle of the connecting block, and then insert the switch shaft into the connecting block to achieve the fixation of the switch shaft and the moving contact assembly. The installation precision requirements are low and the processing technology is simple; moreover, when connecting the switch shaft and the moving contact assembly, there is no need to use additional locating pins, fixing bolts and other connecting parts, so that the load switch after assembly has good integrity, high stability during operation, and is not prone to failure; in addition, through continuous operation tests, it was found that the mechanical life of the load switch of the present application is greater than 3,000 times, which meets the relevant industry standards.

[0008] As an optimization, in the aforementioned four-position oil-immersed high-voltage load switch, the contact plate is provided with a set of grooves spaced apart, thereby forming three movable contacts. The fixing rod is positioned between the upper and lower movable contacts. The groove design provides elasticity to the movable contacts, facilitating the insertion of the stationary contacts into the contact notches. Furthermore, the contact plate has a relatively smooth surface after assembly.

[0009] Furthermore, an arc-shaped protrusion is provided on the edges of the opposing surfaces of the upper and lower movable contact pieces, thereby enabling close contact between the stationary contact and the movable contact piece, thereby ensuring that good contact is maintained between the stationary contact and the movable contact assembly during the rotation of the switch shaft.

[0010] As an optimization, in the aforementioned four-position oil-immersed high-voltage load switch, the operating mechanism includes a rotary handle and a coil spring structure; the coil spring structure comprises an upper transmission body, a lower transmission body, and a coil spring disposed between the upper and lower transmission bodies; the upper transmission body is connected to the rotary handle, and the lower transmission body is connected to the switch shaft. In this case, the energy storage effect of the coil spring structure ensures that the load can be quickly disconnected or connected.

[0011] Furthermore, a sleeve is provided at the connection between the lower transmission body and the switch shaft, and the sleeve is fixed to the lower transmission body and the switch shaft respectively via pins; the handle shaft of the rotary handle is connected to the upper transmission body via threads. This connection structure is simple, occupies little space, and is easy to assemble and disassemble, facilitating subsequent maintenance and replacement.

[0012] As an optimization, in the aforementioned four-position oil-immersed high-voltage load switch, the base includes a cover plate and at least one mounting base; a set of support plates are axially connected between the mounting base and the cover plate; the mounting base is provided with four lugs corresponding to the static contacts; the static contacts are bolted into mounting slots on the lugs. This results in a compact overall structure and easy assembly.

[0013] Furthermore, a mounting plate is provided above the cover plate; the coil spring structure is located between the cover plate and the mounting plate. In this case, the load switch can be directly mounted on the transformer box wall via the mounting plate, which is simple to operate and easy to implement.

[0014] As an optimization, in the aforementioned four-position oil-immersed load switch, the switch shaft can be made of epoxy resin, and the connecting block can be made of engineering plastic. Epoxy resin, as an excellent insulating material, offers advantages such as high strength, good wear resistance, and simple processing, thereby ensuring the service life of the switch shaft. Engineering plastics offer high strength and good pressure resistance, making them easy to mass-produce and ensuring sufficient connection strength between the connecting block and the switch shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of a four-position oil-immersed high-voltage load switch in the prior art;

[0016] Figure 2 yes Figure 1 Assembly diagram of the switch shaft and moving contact assembly of the load switch;

[0017] Figure 3 It is a structural diagram of a moving contact assembly in the prior art;

[0018] Figure 4 This is a schematic structural diagram of the four-position oil-immersed high-voltage load switch of the present application;

[0019] Figure 5 yes Figure 4 Assembly diagram of the switch shaft and moving contact assembly of the load switch;

[0020] Figure 6 is a structural diagram of the moving contact assembly in an embodiment of the present application;

[0021] Figure 7 This is a schematic diagram of the structure of the operating mechanism in the embodiment of the present application;

[0022] Figure 8 Schematic diagram of the assembly of the lower transmission body and the switch shaft in the embodiment of the present application;

[0023] Figure 9 It is a structural schematic diagram of the base in an embodiment of the present application.

[0024] The markings in the accompanying drawings are: 1-base, 101-cover, 102-mounting seat, 103-support plate, 104-lug, 105-mounting plate; 2-switch shaft; 3-operating mechanism, 301-rotating handle, 302-upper transmission body, 303-lower transmission body, 304-coil spring, 305-sleeve; 4-moving contact assembly, 401-contact plate, 402-fixing rod, 403-contact notch, 404-spring, 405-connecting block, 406-groove, 407-moving contact piece, 408-arc-shaped protrusion; 5-static contact. DETAILED DESCRIPTION

[0025] The present invention is further described below with reference to the accompanying drawings and examples, but is not intended to limit the present invention. Any details not described in the following examples are common technical knowledge in the art.

[0026] See also Figure 4 and Figure 5 The four-position oil-immersed high-voltage load switch of the present application includes a base 1, a switch shaft 2 arranged inside the base 1, and an operating mechanism 3 connected to the switch shaft 2 in a transmission manner; at least one moving contact assembly 4 is provided axially on the switch shaft 2, and correspondingly, four static contacts 5 used in conjunction with the moving contact assembly 4 are evenly spaced along the circumference on the base 1; the moving contact assembly 4 includes two semicircular contact plates 401 distributed upper and lower, and the two contact plates 401 are connected by three fixed rods 402 arranged at intervals, thereby forming three contact slots 403 between the two contact plates 401; a spring 404 is sleeved on the fixed rod 402; the thickness of the contact slot 403 is less than the thickness of the static contact 5; the moving contact assembly 4 is connected to the static contact 5 through the contact slot 403; the inner end of the contact plate 401 is embedded in the connecting block 405, and the connecting block 405 is sleeved outside the switch shaft 2.

[0027] Example:

[0028] See also Figure 6In this embodiment, four grooves 406 are spaced apart on the contact plate 401, thereby forming three movable contact pieces 407 on the contact plate 401; the fixing rod 402 is disposed between the upper and lower movable contact pieces 407. The design of the grooves 406 makes the movable contact piece 407 elastic, thereby facilitating the insertion of the stationary contact 5 into the contact notch 403; and the surface of the contact plate 401 is relatively flat after assembly. Furthermore, an arc-shaped protrusion 408 is provided on the edges of the opposing surfaces of the upper and lower movable contact pieces 407. This ensures close contact between the stationary contact 5 and the movable contact piece 407, thereby ensuring good contact between the stationary contact 5 and the movable contact assembly 4 during the rotation of the switch shaft 2. In addition, the provision of the arc-shaped protrusion 408 can also reduce the gap between the upper and lower movable contact pieces 407, thereby effectively utilizing the fault current to increase the contact pressure in a fault condition and improve the load resistance.

[0029] See also Figure 7 In this embodiment, the operating mechanism 3 includes a rotary handle 301 and a coil spring structure. The coil spring structure includes an upper transmission body 302, a lower transmission body 303, and a coil spring 304 disposed between the upper and lower transmission bodies 302 and 303. The upper transmission body 302 is connected to the rotary handle 301, and the lower transmission body 303 is connected to the switch shaft 2. The energy storage function of the coil spring structure ensures that the load can be quickly disconnected and connected.

[0030] See also Figure 8 Furthermore, a sleeve 305 is provided at the connection between the lower transmission body 303 and the switch shaft 2, and the sleeve 305 is secured to the lower transmission body 303 and the switch shaft 2, respectively, via pins. The handle shaft of the rotary handle 301 is threadedly connected to the upper transmission body 302. The upper transmission body 302 is provided with a transmission shaft, the end of which has a threaded hole, into which the handle shaft of the rotary handle 301 is inserted. This connection structure is simple, occupies little space, and is easily assembled and disassembled, facilitating subsequent maintenance and replacement.

[0031] See also Figure 9 In this embodiment, three moving contact assemblies 4 are axially mounted on the switch shaft 2. The base 1 includes a cover plate 101 and three mounting blocks 102. Four support plates 103 are axially connected between the mounting blocks 102 and the cover plate 101, as well as between adjacent mounting blocks 102. A support plate 103 is provided between each adjacent static contact 5. Four disc-shaped lugs 104 are provided on the mounting blocks 102, corresponding to the static contacts 5. The static contacts 5 are secured to the mounting grooves of the lugs 104 by bolts. This results in a compact overall structure and easy assembly.

[0032] In this embodiment, a mounting plate 105 is provided above the cover plate 101; the coil spring structure is located between the cover plate 101 and the mounting plate 105. In this case, the load switch can be directly mounted to the transformer wall via the mounting plate 105, which is simple and easy to implement. The mounting plate 105 is secured to the cover plate 101 via four bolts.

[0033] In this embodiment, the switch shaft 2 is a rectangular rod integrally formed of epoxy resin; the connecting block 405 is made of engineering plastic. This provides the switch shaft 2 with high strength, good wear resistance, and a long service life, and the connection between the connecting block 405 and the switch shaft 2 is strong.

[0034] The above general description of the utility model and the description of its specific embodiments involved in this application should not be construed as limiting the technical solutions of the utility model. Based on the disclosure of this application, those skilled in the art may, without violating the constituent elements of the utility model involved, add to, subtract from, or combine the disclosed technical features in the above general description and / or specific embodiments (including examples) to form other technical solutions within the scope of protection of this application.

Claims

1. A four-position oil-immersed high-voltage load switch, comprising a base (1), a switch shaft (2) disposed inside the base (1), and an operating mechanism (3) in transmission connection with the switch shaft (2); at least one moving contact assembly (4) is axially disposed on the switch shaft (2); correspondingly, four stationary contacts (5) used in conjunction with the moving contact assembly (4) are evenly spaced and circumferentially disposed on the base (1); and characterized in that: The movable contact assembly (4) comprises two semicircular contact plates (401) distributed in an upper and lower direction, and the two contact plates (401) are connected by three fixed rods (402) arranged at intervals, thereby forming three contact notches (403) between the two contact plates (401); a spring (404) is sleeved on the fixed rod (402); the thickness of the contact notch (403) is less than the thickness of the static contact (5); the movable contact assembly (4) is connected to the static contact (5) through the contact notch (403); the inner end of the contact plate (401) is embedded in the connecting block (405), and the connecting block (405) is sleeved outside the switch shaft (2).

2. The four-position oil-immersed high-voltage load switch according to claim 1, characterized in that: A group of grooves (406) are provided on the contact plate (401) at intervals, thereby forming three movable contact pieces (407) on the contact plate (401); the fixing rod (402) is provided between the upper and lower movable contact pieces (407).

3. The four-position oil-immersed high-voltage load switch according to claim 2, characterized in that: An arc-shaped protrusion (408) is provided at the edges of the opposing surfaces of the upper and lower movable contact pieces (407).

4. The four-position oil-immersed high-voltage load switch according to claim 1, characterized in that: The operating mechanism (3) comprises a rotating handle (301) and a coil spring structure; the coil spring structure comprises an upper transmission body (302), a lower transmission body (303), and a coil spring (304) arranged between the upper transmission body (302) and the lower transmission body (303); the upper transmission body (302) is connected to the rotating handle (301), and the lower transmission body (303) is connected to the switch shaft (2).

5. The four-position oil-immersed high-voltage load switch according to claim 4, characterized in that: A shaft sleeve (305) is provided at the connection between the lower transmission body (303) and the switch shaft (2), and the shaft sleeve (305) is fixed to the lower transmission body (303) and the switch shaft (2) respectively via pins.

6. The four-position oil-immersed high-voltage load switch according to claim 4, characterized in that: The handle shaft of the rotating handle (301) is connected to the upper transmission body (302) via threads.

7. The four-position oil-immersed high-voltage load switch according to claim 4, characterized in that: The base (1) comprises a cover plate (101) and at least one mounting seat (102); a group of support plates (103) are axially connected between the mounting seat (102) and the cover plate (101).

8. The four-position oil-immersed high-voltage load switch according to claim 7, characterized in that: Four lugs (104) are provided on the mounting seat (102) corresponding to the static contact (5); the static contact (5) is fixed in the mounting grooves on the lugs (104) by means of bolts.

9. The four-position oil-immersed high-voltage load switch according to claim 7, characterized in that: A mounting plate (105) is provided above the cover plate (101); the coil spring structure is located between the cover plate (101) and the mounting plate (105).

10. The four-position oil-immersed load switch according to claim 1, characterized in that: The switch shaft (2) is made of epoxy resin, and the connecting block (405) is made of engineering plastic.

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