Contact system capable of increasing contact opening distance

Abstract

The invention relates to the technical field of circuit breakers, in particular to a contact system capable of increasing the opening distance of contacts, which comprises a shell, a contact system, an arc extinguishing system, a transmission system and a transmission spring are mounted in the shell, the contact system comprises an insulating part, moving contacts are symmetrically mounted on the outer wall of the insulating part, and static contact plates are arranged on two sides of the exterior of the insulating part. A static contact is mounted at one end, close to the insulating part, of the static contact plate; and the center of the insulating part is rotationally connected with the inner wall of the shell through a pin shaft. According to the contact system capable of increasing the opening distance of the contact, the transmission spring is introduced to be ingeniously matched with the insulating part, so that the closing and opening angles of the contact system are remarkably enlarged under the limited rotation angle of the transmission system. When the transmission system drives the insulating part to rotate, the elastic potential energy of the transmission spring is utilized to enable the insulating part (and the moving contact) to continuously rotate by a certain angle after the transmission system stops driving, so that the opening distance between the moving contact and the static contact is effectively increased.

Description

Technical Field

[0001] The invention relates to the technical field of circuit breakers, in particular to a contact system with increased contact opening distance. Background Art

[0002] In the power system, the circuit breaker is an important control and protection device, and its performance is directly related to the safe and stable operation of the power system. The contact system is one of the core components of the circuit breaker, responsible for the connection and disconnection of the circuit. The traditional contact system often has the problem of limited contact distance in design, which limits the breaking capacity and arc extinguishing performance of the circuit breaker.

[0003] The contact opening distance refers to the shortest distance between the moving contact and the static contact when the contacts are disconnected. Sufficient contact opening distance can ensure that when the circuit is disconnected, an effective insulation interval is formed between the contacts to prevent the arc from reigniting and short circuit faults. At the same time, a larger contact opening distance is also conducive to the arc extinguishing system to play a better role, quickly extinguish the arc, and protect the safety of the circuit and equipment.

[0004] However, in traditional contact systems, due to structural design limitations, the transmission system often directly drives the opening and closing of the contacts, resulting in the contact spacing being limited by the rotation angle of the transmission system. In order to meet the demand for a larger contact spacing, it is usually necessary to increase the complexity and size of the transmission system, which not only increases manufacturing costs, but also reduces the reliability and flexibility of the equipment.

[0005] In addition, during the disconnection process, the traditional contact system is prone to strong arcs and electromagnetic interference due to the fast contact movement speed, which has an adverse effect on the insulation performance of the equipment and the surrounding environment. Therefore, how to design a contact system that can increase the contact opening distance, improve the breaking capacity, and reduce arcs and electromagnetic interference has become an urgent problem to be solved in the field of circuit breaker technology. Summary of the invention

[0006] The object of the present invention is to provide a contact system with increased contact spacing, so as to solve the problem that the traditional contact system mentioned in the above background technology often has limited contact spacing in design, which limits the breaking capacity and arc extinguishing performance of the circuit breaker.

[0007] To achieve the above-mentioned purpose, the present invention provides a contact system for increasing the contact opening distance, comprising a shell, wherein a contact system, an arc extinguishing system, a transmission system, and a transmission spring are installed inside the shell, the contact system comprises an insulating member, and moving contacts are symmetrically installed on the outer wall of the insulating member, and static contact plates are arranged on both sides of the outside of the insulating member, and a static contact is installed on one end of the static contact plate close to the insulating member, the center of the insulating member is rotatably connected to the inner wall of the shell through a pin shaft, and the insulating member is driven to rotate by the transmission system, so that the static contact is in contact with or separated from the moving contact, and the transmission spring makes the closing and opening angles of the contact system larger relative to the rotation angle of the transmission system.

[0008] As a preferred solution of the present invention, the shell includes a base, and a cover is installed on the top of the base.

[0009] As a preferred solution of the present invention, a limiting groove is provided in the middle of the cover to limit the range of movement of the transmission system.

[0010] As a preferred solution of the present invention, a wiring nut is installed at one end of the stationary touch plate away from the stationary touch plate.

[0011] As a preferred solution of the present invention, an annular groove is provided on the outer wall of the stationary contact plate, and the stationary contact point is slidably matched with the annular groove.

[0012] As a preferred solution of the present invention, the arc extinguishing system is installed on the outside of the insulating component and includes two semicircular ring structures.

[0013] As a preferred solution of the present invention, the semicircular ring structure of the arc extinguishing system includes a plurality of arc-shaped arc extinguishing grids arranged at equal intervals, and insulating plates are installed on the upper and lower sides of the arc extinguishing grids.

[0014] As a preferred solution of the present invention, an interface is provided on the surface of the insulating member, and the output end of the transmission system is snap-fitted with the interface.

[0015] As a preferred solution of the present invention, one end of the transmission spring is connected to the housing via a first connecting end, and the other end of the transmission spring is connected to the insulating member via a second connecting end.

[0016] As a preferred embodiment of the present invention, when the static contact contacts the moving contact, the insulating member rotates under the drive of the clockwise rotation of the transmission system, and the second connecting end is located to the right of the line connecting the first connecting end and the center of the insulating member. Under the pressure of the transmission spring, the insulating member continues to rotate; when the static contact is disconnected from the moving contact, the insulating member rotates counterclockwise by an angle A along with the transmission system, and under the pressure of the transmission spring, the moving contact automatically rotates by an angle C to the disconnected position D1.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In the contact system with increased contact opening distance, by introducing the ingenious cooperation between the transmission spring and the insulating part, the present invention realizes a significant enlargement of the closing and opening angles of the contact system under the limited rotation angle of the transmission system. When the transmission system drives the insulating part to rotate, the transmission spring uses its elastic potential energy to enable the insulating part (and the moving contact) to continue to rotate a certain angle after the transmission system stops driving, thereby effectively increasing the opening distance between the moving contact and the static contact. This design not only improves the breaking capacity of the circuit breaker, but also ensures that sufficient insulation spacing is formed between the contacts when the circuit is disconnected to prevent arc reignition and short circuit failure.

[0019] 2. In the contact system with increased contact spacing, the increased contact spacing provides a better working environment for the arc extinguishing system. When the contacts are separated, the larger spacing makes it easier to lengthen and extinguish the arc, thereby improving the efficiency and reliability of the arc extinguishing system. At the same time, the arc extinguishing system in the present invention adopts a semicircular ring structure, including a plurality of arc-shaped arc extinguishing grids arranged at equal intervals. This design further enhances the arc extinguishing effect and ensures the safe disconnection of the circuit.

[0020] 3. In the contact system with increased contact spacing, the contact spacing is increased by the cooperation of the transmission spring and the insulating member without increasing the complexity and size of the transmission system. This design not only reduces the manufacturing cost, but also improves the reliability and flexibility of the equipment. In addition, the present invention integrates components such as the contact system, arc extinguishing system, transmission system and transmission spring in the housing to form a compact and easy-to-manage module, which is convenient for production, installation and maintenance.

[0021] 4. In the contact system with increased contact distance, due to the increase of contact distance and the optimization of arc extinguishing system, the arc intensity generated during the breaking process of the present invention is effectively controlled, thereby reducing the damage of the arc to the insulation performance of the equipment and the surrounding environment. At the same time, the increased contact distance also helps to reduce the electromagnetic interference generated during the breaking process and improve the electromagnetic compatibility of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a partial structural schematic diagram of the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of the contact system in the present invention;

[0025] Figure 4 It is a structural schematic diagram of the arc extinguishing system in the present invention;

[0026] Figure 5 It is a structural schematic diagram of the housing in the present invention;

[0027] The meaning of each number in the figure is:

[0028] 1. Shell; 11. Limiting groove; 101. Cover; 102. Base; 2. Contact system; 201. Wiring nut; 202. Stationary contact plate; 203. Moving contact; 204. Insulating member; 205. Stationary contact; 3. Arc extinguishing system; 301. Insulating plate; 302. Arc extinguishing grid; 4. Transmission system; 5. Transmission spring; 51. First connecting end; 52. Second connecting end; 6. Mounting fixture. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The present invention provides a contact system with increased contact spacing, such as Figure 1-Figure 5 As shown, it includes a housing 1, and a contact system 2, an arc extinguishing system 3, a transmission system 4, and a transmission spring 5 are installed inside the housing 1. The contact system 2 includes an insulating member 204, and a moving contact 203 is symmetrically installed on the outer wall of the insulating member 204. Static contact plates 202 are arranged on both sides of the outside of the insulating member 204, and a static contact 205 is installed on one end of the static contact plate 202 close to the insulating member 204. The center of the insulating member 204 is rotatably connected to the inner wall of the housing 1 through a pin shaft. The insulating member 204 is driven to rotate by the transmission system 4, so that the static contact 205 is in contact with or separated from the moving contact 203. The transmission spring 5 makes the closing and disconnecting angles of the contact system 2 larger relative to the rotation angle of the transmission system 4. Through the design of the transmission spring 5, the present invention realizes that when the transmission system 4 rotates limitedly, the contact system 2 (especially between the moving contact 203 and the static contact 205) can form a larger opening and closing angle. This means that when the circuit breaker is disconnected, the distance between the moving contact 203 and the stationary contact 205 (ie, the contact opening distance) is significantly increased, thereby improving the breaking capacity and safety of the circuit breaker. The housing 1 is fixed to the corresponding assembly position of the circuit breaker by installing the fixing member 6 .

[0031] The increased contact spacing helps to form a more effective insulation interval when the circuit is disconnected, preventing the reignition of the arc and the occurrence of short-circuit faults. This is crucial for the stable operation of the power system and the protection of equipment.

[0032] The introduction of the transmission spring 5 forms a flexible adjustment relationship between the rotation angle of the transmission system 4 and the actual opening and closing angle of the contact system 2. This design not only improves the flexibility of the transmission system, but also enables the entire contact system to more accurately control the opening and closing state of the contacts.

[0033] Although this description does not directly mention the working principle of the arc extinguishing system 3, the increased contact distance undoubtedly provides a better working environment for the arc extinguishing system. During the contact separation process, the larger contact distance helps to lengthen and extinguish the arc, thereby improving the efficiency and reliability of the arc extinguishing system.

[0034] The entire contact system is cleverly integrated inside the housing 1, including the contact system 2, arc extinguishing system 3, transmission system 4, transmission spring 5 and other components. This compact design not only saves space, but also makes the installation, commissioning and maintenance of the system more convenient.

[0035] In this embodiment, the housing 1 includes a base 102, and a cover 101 is installed on the top of the base 102. This split design facilitates the processing, assembly and maintenance of the housing. The housing 1 provides solid protection for internal components (such as the contact system 2, the arc extinguishing system 3, the transmission system 4, etc.), ensuring the stability and durability of the contact system.

[0036] Specifically, a limiting groove 11 is provided in the middle of the cover 101 to limit the range of motion of the transmission system 4. The limiting groove 11 in the middle of the cover 101 effectively limits the range of motion of the transmission system 4, prevents excessive rotation or misalignment of the transmission system 4, and thus ensures accurate control and stable operation of the contact system 2.

[0037] Furthermore, a wiring nut 201 is installed at one end of the stationary touch plate 202 away from the stationary touch plate 202, which is convenient for connection with an external circuit, thereby improving the convenience and reliability of wiring.

[0038] Furthermore, an annular groove is provided on the outer wall of the stationary contact plate 202, and the stationary contact 205 is slidably matched with the annular groove. This design allows the stationary contact 205 to move flexibly in the annular groove, ensures good contact and separation between the stationary contact 205 and the moving contact 203, and improves the stability and durability of the contact system 2.

[0039] Furthermore, the arc extinguishing system 3 is installed outside the insulating member 204 and includes two semicircular ring structures. This layout is conducive to quickly surrounding and extinguishing the arc, thereby improving arc extinguishing efficiency and safety.

[0040] Furthermore, the semicircular ring structure of the arc extinguishing system 3 includes a plurality of arc-shaped arc extinguishing grids 302 arranged at equal intervals, and insulating plates 301 are installed on the upper and lower sides of the arc extinguishing grids 302. This further enhances the arc extinguishing effect and prevents the arc from damaging the contact system 2.

[0041] Furthermore, an interface is provided on the surface of the insulating member 204, and the output end of the transmission system 4 is engaged with the interface. This connection method is simple and reliable, and facilitates the transmission system 4 to accurately drive the insulating member 204 (and the moving contact 203).

[0042] Furthermore, one end of the transmission spring 5 is connected to the housing 1 through the first connection end 51, and the other end of the transmission spring 5 is connected to the insulating member 204 through the second connection end 52. This design enables the transmission spring 5 to store and release elastic potential energy, providing additional power for the rotation of the insulating member 204 (and the moving contact 203). The existence of the transmission spring 5 increases the closing and opening angles of the contact system relative to the rotation angle of the transmission system 4, thereby increasing the contact opening distance and improving the breaking capacity and safety of the circuit breaker.

[0043] Furthermore, when the static contact 205 contacts the moving contact 203, driven by the clockwise rotation of the transmission system 4, the insulating member 204 rotates, and the moving contact 203 rotates from the D1 position to the D2 position. The second connection end 52 is located on the right side of the line connecting the first connection end 51 and the center of the insulating member 204. Under the pressure of the transmission spring 5, the insulating member 204 continues to rotate, and the moving contact 203 automatically rotates by an angle A from D2 to the D3 position. At this time, the process of the moving contact 203 rotating by an angle A from D2 to D3 has nothing to do with the transmission system 4, and has the effect of amplifying the angle A. When the static contact 205 is disconnected from the moving contact 203, the insulating member 204 rotates by an angle A counterclockwise with the transmission system 4, and under the pressure of the transmission spring 5, the moving contact 203 automatically rotates by an angle C to the disconnected position D1.

[0044] The present invention utilizes the torque generated by one end of the elastic element rotating around the rotation center and passing the position of the line connecting the rotation center and the other end of the elastic element, so that the contact automatically moves forward. After the transmission member passes the dead point, the contact automatically moves, thereby increasing the transmission angle, increasing the contact switching angle, and improving the contact opening distance.

[0045] When the contact system with increased contact spacing of the present invention is used, the contact system is in a stationary state, and the moving contact 203 and the static contact 205 are in a separated or contacted state, depending on the current state of the circuit breaker. The transmission spring 5 is in a pre-tightened state, providing potential elastic potential energy for the rotation of the insulating member 204.

[0046] Closing process (if from disconnection to closing): the transmission system 4 receives the closing signal and starts to rotate in the clockwise direction. The output end of the transmission system 4 drives the insulating part 204 to rotate through the snap-fit, driving the moving contact 203 to move from the D1 position to the D2 position. When the moving contact 203 approaches the D2 position, due to the preload of the transmission spring 5, the insulating part 204 will rotate an additional angle A under the action of the transmission spring 5 while the transmission system 4 continues to rotate, so that the moving contact 203 reaches the D3 position and achieves close contact with the static contact 205. In this process, the additional rotation angle A of the moving contact 203 from D2 to D3 is independently completed by the transmission spring 5 and has nothing to do with the direct drive of the transmission system 4, thereby achieving an increase in the contact opening distance.

[0047] The transmission system 4 receives the disconnection signal and starts to rotate counterclockwise. The insulating member 204 rotates counterclockwise by an angle A along with the transmission system 4, and the moving contact 203 starts to move from the D3 position to the D2 position. After the transmission system 4 stops rotating, due to the elastic potential energy of the transmission spring 5, the insulating member 204 will continue to rotate by an angle C under the action of the transmission spring 5, so that the moving contact 203 moves completely to the disconnection position D1 and is completely separated from the static contact 205. In this process, the additional rotation of the moving contact 203 from D2 to D1 by an angle C is also completed independently by the transmission spring 5, ensuring the complete disconnection of the contacts and sufficient contact opening distance.

[0048] Arc extinguishing process (accompanied by disconnection process): When the moving contact 203 is separated from the stationary contact 205, an arc may be generated.

[0049] The arc extinguishing grid 302 and the insulating plate 301 of the arc extinguishing system 3 quickly surround the arc and extinguish it by lengthening and cooling the arc. The increased contact distance provides a better working environment for the arc extinguishing system, which helps to improve the arc extinguishing efficiency and reliability.

[0050] System stability and protection: The housing 1 (including the base 102 and the cover 101) provides solid protection for the internal components, ensuring the stability and durability of the contact system. The limit groove 11 in the middle of the cover 101 limits the range of motion of the transmission system 4, preventing excessive rotation or misalignment, and ensuring precise control and stable operation of the contact system. The annular groove design of the stationary contact plate 202 allows the stationary contact 205 to move flexibly, ensuring good contact and separation effects.

[0051] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A contact system for increasing contact spacing, comprising a housing (1), characterized in that: A contact system (2), an arc extinguishing system (3), a transmission system (4), and a transmission spring (5) are installed inside the housing (1); the contact system (2) comprises an insulating member (204); a moving contact (203) is symmetrically installed on the outer wall of the insulating member (204); static contact plates (202) are arranged on both sides of the outside of the insulating member (204); a static contact (205) is installed at one end of the static contact plate (202) close to the insulating member (204); the center of the insulating member (204) is rotatably connected to the inner wall of the housing (1) via a pin shaft; the insulating member (204) is driven to rotate by the transmission system (4), thereby causing the static contact (205) to contact or separate from the moving contact (203); and the transmission spring (5) causes the closing and opening angles of the contact system (2) to become larger relative to the rotation angle of the transmission system (4).

2. The contact system for increasing contact spacing according to claim 1, characterized in that: The housing (1) comprises a base (102), and a cover (101) is installed on the top of the base (102).

3. The contact system with increased contact spacing according to claim 2, characterized in that: A limiting groove (11) is provided in the middle of the cover (101) for limiting the range of movement of the transmission system (4).

4. The contact system with increased contact spacing according to claim 1, characterized in that: A wiring nut (201) is installed at one end of the stationary touch plate (202) away from the stationary touch plate (202).

5. The contact system with increased contact spacing according to claim 1, characterized in that: The outer wall of the stationary contact plate (202) is provided with an annular groove, and the stationary contact point (205) is slidably matched with the annular groove.

6. The contact system with increased contact spacing according to claim 1, characterized in that: The arc extinguishing system (3) is installed on the outside of the insulating component (204) and comprises two semicircular ring structures.

7. The contact system with increased contact spacing according to claim 6, characterized in that: The semicircular ring structure of the arc extinguishing system (3) comprises a plurality of arc-shaped arc extinguishing grids (302) arranged at equal intervals, and insulating plates (301) are installed on the upper and lower sides of the arc extinguishing grids (302).

8. The contact system with increased contact spacing according to claim 1, characterized in that: An interface is provided on the surface of the insulating member (204), and the output end of the transmission system (4) is snap-fitted with the interface.

9. The contact system with increased contact spacing according to claim 1, characterized in that: One end of the transmission spring (5) is connected to the housing (1) via a first connection end (51), and the other end of the transmission spring (5) is connected to the insulating member (204) via a second connection end (52).

10. The contact system with increased contact spacing according to claim 9, characterized in that: When the static contact (205) is in contact with the moving contact (203), the insulating member (204) rotates under the drive of the clockwise rotation of the transmission system (4), and the second connection end (52) is located on the right side of the line connecting the first connection end (51) and the center of the insulating member (204). Under the pressure of the transmission spring (5), the insulating member (204) continues to rotate; when the static contact (205) is disconnected from the moving contact (203), the insulating member (204) rotates counterclockwise by an angle A along with the transmission system (4), and under the pressure of the transmission spring (5), the moving contact (203) automatically rotates by an angle C to a disconnected position D1.

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