Circuit breaker and switch cabinet

Abstract

The utility model discloses a circuit breaker and a switch cabinet, and the circuit breaker comprises a housing which is at least partially enclosed to form a cavity; a post disposed outside the cavity and fixed to the case; the static contact is arranged in the pole; the moving contact is arranged in the pole and can move to be in contact with or separated from the static contact; a mounting plate disposed inside the cavity and fixed to the housing; the static iron core is arranged in the cavity and is fixed to the mounting plate; the movable iron core is arranged in the cavity and connected to the movable contact through a push rod, and the movable iron core can move towards the static iron core under the attraction effect of the static iron core; wherein the housing is assembled to the pole and the mounting plate at different positions of the housing, respectively.

Description

Technical Field

[0001] The utility model relates to a circuit breaker and a switch cabinet, and more particularly to a circuit breaker with a longer service life and a switch cabinet comprising the circuit breaker. Background Art

[0002] The circuit breaker controls the closing and opening of the circuit breaker by controlling the contact and separation of the moving contact and the stationary contact. During the closing operation of the circuit breaker, the moving iron core moves toward the stationary iron core under the attraction of the stationary iron core and finally contacts the stationary iron core, thereby driving the moving contact to move toward the stationary contact and finally contact the stationary contact.

[0003] In the prior art, the contact between the moving iron core and the stationary iron core of the circuit breaker housing causes impact on the stationary iron core, causing the pole to withstand relatively strong impact. The service life of the pole is greatly reduced under the strong impact, which is not conducive to the service life and stability of the circuit breaker.

[0004] Therefore, it is desired to provide a circuit breaker to improve the defects in the above-mentioned prior art. Utility Model Content

[0005] According to a first aspect of the utility model, a circuit breaker is proposed, comprising: a shell, at least partially surrounding a cavity; a pole, arranged outside the cavity and fixed to the shell; a static contact, arranged in the pole; a moving contact, arranged in the pole and capable of moving to contact or separate from the static contact; a mounting plate, arranged inside the cavity and fixed to the shell; a static iron core, arranged inside the cavity and fixed to the mounting plate; a moving iron core, arranged inside the cavity and connected to the moving contact via a push rod, and the moving iron core can move toward the static iron core under the attraction of the static iron core; wherein the shell has a first mounting portion and a second mounting portion, the shell is assembled to the pole via the first mounting portion, and the shell is assembled to the mounting plate via the second mounting portion.

[0006] According to this solution, the shell is assembled to the pole and the mounting plate at different positions, respectively, so that the connection stiffness between the mounting plate, the shell and the pole is reduced, thereby reducing the impact transmitted from the mounting plate to the pole and improving the service life of the pole.

[0007] In some embodiments, a first assembly hole and a second assembly hole may be provided on the shell, a first mounting hole may be provided on the pole, and a second mounting hole may be provided on the mounting plate; the first assembly hole is aligned with the first mounting hole, and the first screw passes through the first assembly hole and the first mounting hole; the second assembly hole is aligned with the second mounting hole, and the second screw passes through the second assembly hole and the second mounting hole; wherein the first screw is different from the second screw.

[0008] According to this solution, the housing is assembled to the pole and the mounting plate respectively by two different screws, which reduces the connection stiffness between the mounting plate, the housing and the pole, thereby reducing the impact transmitted from the mounting plate to the pole and improving the service life of the pole.

[0009] In some embodiments, the first mounting portion may be a first clip hole, the second mounting portion may be a second clip hole, a first clip is provided on the pole, a second clip is provided on the mounting plate, and the first clip and the second clip are respectively inserted into the first clip hole and the second clip hole.

[0010] In some embodiments, the distance between the first assembly hole and the second assembly hole along the longitudinal direction may be greater than 30 mm, and / or the distance between the first assembly hole and the second assembly hole along the transverse direction may be greater than 30 mm, the longitudinal direction is parallel to the extension direction of the push rod, and the transverse direction is perpendicular to the longitudinal direction.

[0011] According to this solution, by designing a larger distance between the assembly point of the housing and the pole and the assembly point between the housing and the mounting plate, the connection stiffness between the mounting plate, the housing and the pole is further reduced, thereby further reducing the impact transmitted from the mounting plate to the pole, and further improving the service life of the pole.

[0012] In some solutions, the circuit breaker may further include a contact spring, one end of the contact spring is connected to the moving contact, and the other end of the contact spring faces the push rod.

[0013] According to this solution, by arranging the contact spring on one side of the moving contact, the rigid mass of the push rod that generates the impact is reduced, thereby reducing the impact of the push rod on the mounting plate, thereby reducing the impact transmitted from the mounting plate to the pole, and further improving the service life of the pole.

[0014] In some embodiments, the circuit breaker may further include an auxiliary switch, which is arranged inside the cavity and connected to the push rod. When the moving contact contacts the static contact, the auxiliary switch is in a first state, and when the moving contact is separated from the static contact, the auxiliary switch is in a second state.

[0015] According to this solution, the auxiliary switch is in a first state and a second state respectively based on the closing and opening states of the circuit breaker, which facilitates the integrated application of the circuit breaker in the electrical system.

[0016] In some embodiments, the circuit breaker may further include a drive portion fixed to the push rod, the drive portion having a main body and a first drive arm extending from the main body, the first drive arm being configured to actuate a button of the auxiliary switch to switch the auxiliary switch between a first state and a second state.

[0017] In some embodiments, the circuit breaker may further include a proximity switch, which is arranged inside the cavity. When the moving contact contacts the stationary contact, the proximity switch is in a first proximity state, and when the moving contact is separated from the stationary contact, the proximity switch is in a second proximity state.

[0018] According to the solution, the proximity switch is in the first proximity state and the second proximity state respectively based on the closing and opening states of the circuit breaker, which is helpful for the integrated application of the circuit breaker in the electrical system. And compared with the switch that can only switch the state by being touched, the proximity switch can switch the state without being touched, which is particularly advantageous in the circuit breaker of the utility model, because the switch is not touched, which can reduce the adverse effects of the switch being hit on the switch.

[0019] In some aspects, the driving portion may further include a second driving arm extending from the main body, and the proximity switch is configured to switch between the first proximity state and the second proximity state based on a distance between the proximity switch and the second driving arm.

[0020] In some embodiments, a limit hole may be provided on the moving iron core, and the limit shaft passes through the limit hole to limit the movement of the moving iron core along the lateral direction; another limit hole is provided on the driving part, and the limit shaft passes through the other limit hole to limit the movement of the driving part along the lateral direction.

[0021] According to this solution, the moving iron core is moved toward the static iron core through the limiting hole, thereby improving the reliability of closing the switch.

[0022] In some embodiments, the circuit breaker may further include a limit plate fixed to the mounting plate and arranged on a side of the moving iron core away from the stationary iron core to limit the movement range of the moving iron core in a direction away from the stationary iron core.

[0023] According to this solution, the limit plate can limit the movement range of the moving iron core during the opening operation, thereby improving the stability of the circuit breaker.

[0024] According to a second aspect of the utility model, a switch cabinet is provided, comprising a trolley and a circuit breaker according to the first aspect of the utility model, wherein the circuit breaker is assembled on the trolley. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a switch cabinet according to an embodiment of the utility model is shown;

[0026] Figure 2 A schematic diagram of a circuit breaker according to an embodiment of the utility model is shown;

[0027] Figure 3 Another schematic diagram of a circuit breaker according to an embodiment of the utility model is shown;

[0028] Figure 4An exploded view of a circuit breaker according to an embodiment of the present invention is shown.

[0029] Reference numerals:

[0030] 10 Switchgear

[0031] 100 Circuit Breaker

[0032] 110 Housing

[0033] 111 Cavity

[0034] 112 First assembly hole

[0035] 114 Second mounting hole

[0036] 116 First Screw

[0037] 118 Second screw

[0038] 120 pole

[0039] 122 First mounting hole

[0040] 132 Stationary contact

[0041] 134 Moving contact

[0042] 136 Contact spring

[0043] 138 Putter

[0044] 140 Mounting plate

[0045] 144 Second mounting hole

[0046] 152 static iron core

[0047] 154 Moving iron core

[0048] 156 Limit hole

[0049] 158 limit axis

[0050] 160 Auxiliary switch

[0051] 162 Button

[0052] 170 Drive unit

[0053] 172 Main Body

[0054] 174 First drive arm

[0055] 176 Second drive arm

[0056] 178 Another limit hole

[0057] 180 Proximity switch

[0058] 190 Limiting plate

[0059] 200 Carts DETAILED DESCRIPTION

[0060] In order to make the purpose, scheme and advantages of the technical solution of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described in conjunction with the drawings of the specific embodiments of the utility model. Unless otherwise specified, the terms used in this article have the usual meanings in the art. The same reference numerals in the drawings represent the same components.

[0061] For a clearer description, unless otherwise specified, the directional terms appearing in this article have the following meanings: the longitudinal direction refers to the moving direction of the push rod, the moving iron core and the moving contact, and the transverse direction is the direction perpendicular to the longitudinal direction.

[0062] Figure 1 A schematic diagram of a switch cabinet 10 according to an embodiment of the present utility model is shown. The switch cabinet 10 mainly includes a circuit breaker 100 and a trolley 200 , and the circuit breaker 100 is assembled on the trolley 200 .

[0063] Figure 2 A schematic diagram of a circuit breaker 100 according to an embodiment of the utility model is shown, and the circuit breaker 100 mainly includes a housing 110, a pole 120, a static contact 132, a moving contact 134, a mounting plate 140, a static iron core 152 and a moving iron core 154. The housing at least partially surrounds a cavity 111, and the mounting plate 140, the static iron core 152 and the moving iron core 154 are located inside the cavity 111. The pole 120 is located outside the cavity 111, and the static contact 132 and the moving contact 134 are arranged inside the pole 120. The static iron core 152 is fixed to the mounting plate 140, and the moving iron core 154 is connected to the moving contact 134 via a push rod 138. The moving iron core 154 can move toward the static iron core 152 under the attraction of the static iron core 152, thereby driving the push rod 138 to move (for example, as Figure 2 The push rod 138 then drives the moving contact 134 to move toward the stationary contact 132 and finally contacts the stationary contact 132, thereby completing the closing operation.

[0064] When the moving iron core 154 moves toward the stationary iron core 152 and finally contacts the stationary iron core 152, the moving iron core 154 generates an impact (i.e., impulse) on the stationary iron core 152, and the impulse received by the stationary iron core 152 is transmitted to the mounting plate 140. In the prior art, the mounting plate 140 and the pole 120 are directly fixed to the housing 110 together. This rigid connection causes a large part of the impulse received by the mounting plate 140 to continue to be transmitted to the pole 120, and the pole 120 is easily damaged (especially the vacuum bubble of the pole 120) under the action of the impulse, and the service life of the pole 120 is reduced, which also reduces the reliability of the circuit breaker 100.

[0065] To this end, in the circuit breaker 100 of the present invention, the mounting plate 140 and the pole 120 are not directly fixed to the housing 110 together, but the mounting plate 140 and the pole 120 are fixed to the housing 110 separately, that is, the housing 110 is respectively assembled to the pole 120 and the mounting plate 140 through different mounting parts 112 and 114 at different positions of the housing 110.

[0066] Specifically, the housing 110 may be provided with a first assembly hole 112 and a second assembly hole 114 (eg, Figure 4 As shown in FIG. 1 , a first mounting hole 122 is provided on the pole 120, and a second mounting hole 144 is provided on the mounting plate 140. The first assembly hole 112 is aligned with the first mounting hole 122, and the first screw 116 passes through the first assembly hole 112 and the first mounting hole 122 to assemble the pole 120 to the housing 110. The second assembly hole 114 is aligned with the second mounting hole 144, and the second screw 118 passes through the second assembly hole 114 and the second mounting hole 144 to assemble the mounting plate 140 to the housing 110. It should be noted that, unlike the prior art in which the pole 120, the housing 110 and the mounting plate 140 are fixed together with the same screw, the first screw 116 of the utility model is different from the second screw 118. The housing 110 is assembled to the pole 120 and the mounting plate 140 respectively by two different screws 116 and 118, which reduces the connection rigidity between the mounting plate 140, the housing 110 and the pole 120, thereby reducing the impact transmitted from the mounting plate 140 to the pole 120 and improving the service life of the pole 120. It should be understood that the screws and the corresponding assembly holes and the number of mounting holes in the drawings are only exemplary, and the utility model is not intended to limit the number of the above-mentioned screws and the corresponding assembly holes and mounting holes.

[0067] Alternatively, the first mounting portion 112 may be a first clamping hole, the second mounting portion 114 may be a second clamping hole, the pole 120 is provided with a first clamping buckle (not shown), the mounting plate 140 is provided with a second clamping buckle (not shown), the first clamping buckle and the second clamping buckle are respectively clamped into the first clamping hole and the second clamping hole, so as to assemble the housing 110 with the pole 120 and the mounting plate 140, respectively. Similarly, because the first clamping hole is different from the second clamping hole, the connection rigidity between the mounting plate 140, the housing 110 and the pole 120 is reduced, thereby reducing the impact transmitted from the mounting plate 140 to the pole 120, and improving the service life of the pole 120.

[0068] Preferably, the distance between the first assembly hole 112 and the second assembly hole 144 along the longitudinal direction may be greater than 30 mm, and / or the distance between the first assembly hole 112 and the second assembly hole 144 along the transverse direction may be greater than 30 mm. By designing a larger distance between the assembly point of the housing 110 and the pole 120 and the assembly point between the housing 110 and the mounting plate 140, the connection stiffness between the mounting plate 140, the housing 110 and the pole 120 is further reduced, thereby further reducing the impact transmitted from the mounting plate 140 to the pole 120, and further improving the service life of the pole 120.

[0069] Preferably, the circuit breaker 100 may further include a contact spring 136, one end of which is connected to the movable contact 134, and the other end of which faces the push rod 138. By arranging the contact spring 136 on one side of the movable contact 134 (rather than on one side of the push rod 138 as in the prior art), the rigid mass of the push rod 138 that generates the impact is reduced, thereby reducing the impulse of the push rod 138 on the mounting plate 140, thereby reducing the impulse transmitted from the mounting plate 140 to the pole 120, and further improving the service life of the pole 120.

[0070] Preferably, the circuit breaker 100 may further include an auxiliary switch 160, which is arranged inside the cavity 111. The auxiliary switch 160 is connected to the push rod 138. When the moving contact 134 is in contact with the static contact 132 (i.e., the circuit breaker 100 is in a closed state), the auxiliary switch 160 is in a first state. When the moving contact 134 is separated from the static contact 132 (i.e., the circuit breaker 100 is in an open state), the auxiliary switch 160 is in a second state. The auxiliary switch 160 is in a first state and a second state respectively based on the closed and open states of the circuit breaker 100, which facilitates the integrated application of the circuit breaker 100 in the electrical system.

[0071] Optionally, the circuit breaker 100 may further include a drive portion 170, which is fixed to the push rod 138, and has a main body 172 and a first drive arm 174 extending from the main body 170, and the first drive arm 174 is configured to be able to actuate the button 162 of the auxiliary switch 160 to switch the auxiliary switch 160 between the first state and the second state.

[0072] Preferably, the circuit breaker 100 may further include a proximity switch 180, which is arranged inside the cavity 111. When the moving contact 134 contacts the static contact 132 (i.e., the circuit breaker 100 is in a closed state), the proximity switch 180 is in a first close state. When the moving contact 134 is separated from the static contact 132 (i.e., the circuit breaker 100 is in an open state), the proximity switch 180 is in a second close state. Similar to the auxiliary switch 160, the proximity switch 180 is in a first close state and a second close state respectively based on the closed and open states of the circuit breaker 100, which facilitates the integrated application of the circuit breaker 100 in the electrical system. And compared to a switch that can only switch states by being touched (e.g., the auxiliary switch 160), the proximity switch 180 can switch states without being touched, which is particularly advantageous in the circuit breaker 100 of the present invention because the proximity switch 180 not being touched can reduce the adverse effects of being hit on the proximity switch 180.

[0073] Optionally, the driving portion 170 may further include a second driving arm 176 extending from the main body 172 , and the proximity switch 180 is configured to switch between the first proximity state and the second proximity state based on the distance between the proximity switch 180 and the second driving arm 176 .

[0074] Preferably, a limiting hole 156 may be provided on the moving iron core 134, and a limiting shaft 158 ​​passes through the limiting hole 156 to limit the movement of the moving iron core 134 in the lateral direction. Similarly, another limiting hole 178 is provided on the main body 172 of the driving part 170, and the limiting shaft 158 ​​passes through the other limiting hole 178 to limit the movement of the driving part 170 in the lateral direction. The limiting hole 156 allows the moving iron core 154 to move toward the static iron core 152, thereby improving the reliability of the closing operation of the circuit breaker 100.

[0075] Preferably, if Figure 3 As shown, the circuit breaker 100 may further include a limit plate 190, which is fixed to the mounting plate 140 and arranged on a side of the moving iron core 154 away from the static iron core 152 to limit the movement range of the moving iron core 154 in a direction away from the static iron core 152. The limit plate 190 can limit the movement range of the moving iron core 154 during the opening operation, thereby improving the stability of the circuit breaker 100.

[0076] This document describes in detail several exemplary embodiments of the present invention with reference to preferred embodiments. However, it will be understood by those skilled in the art that, without departing from the concept of the present invention, various modifications and variations may be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present invention may be combined without exceeding the protection scope of the present invention, which is determined by the appended claims.

Claims

1. A circuit breaker, characterized in that: include: A housing at least partially encloses and forms a cavity; a pole disposed outside the cavity and fixed to the housing; A static contact, arranged in the pole; A moving contact, disposed in the pole and movable to contact or separate from the stationary contact; a mounting plate disposed inside the cavity and fixed to the housing; a static iron core, disposed inside the cavity and fixed to the mounting plate; A moving iron core is disposed inside the cavity and connected to the moving contact via a push rod, and the moving iron core can move toward the static iron core under the attraction of the static iron core; The housing has a first mounting portion and a second mounting portion, the housing is assembled to the pole via the first mounting portion, and the housing is assembled to the mounting plate via the second mounting portion.

2. The circuit breaker according to claim 1, characterized in that: The first mounting portion is a first assembly hole, the second mounting portion is a second assembly hole, the pole is provided with a first mounting hole, and the mounting plate is provided with a second mounting hole; The first assembly hole is aligned with the first mounting hole, and the first screw passes through the first assembly hole and the first mounting hole; The second assembly hole is aligned with the second mounting hole, and the second screw passes through the second assembly hole and the second mounting hole; Wherein, the first screw is different from the second screw.

3. The circuit breaker according to claim 1, characterized in that: The first mounting portion is a first clamping hole, the second mounting portion is a second clamping hole, a first buckle is provided on the pole, a second buckle is provided on the mounting plate, and the first buckle and the second buckle are respectively clamped into the first clamping hole and the second clamping hole.

4. The circuit breaker according to claim 2, characterized in that: The distance between the first assembly hole and the second assembly hole along the longitudinal direction is greater than 30 mm, and / or the distance between the first assembly hole and the second assembly hole along the transverse direction is greater than 30 mm, the longitudinal direction is parallel to the extension direction of the push rod, and the transverse direction is perpendicular to the longitudinal direction.

5. The circuit breaker according to claim 1, characterized in that: The invention also includes a contact spring, one end of which is connected to the moving contact, and the other end of which faces the push rod.

6. The circuit breaker according to claim 4, characterized in that: It also includes an auxiliary switch, which is arranged inside the cavity and connected to the push rod. When the moving contact is in contact with the static contact, the auxiliary switch is in a first state, and when the moving contact is separated from the static contact, the auxiliary switch is in a second state.

7. The circuit breaker according to claim 6, characterized in that: It also includes a driving part, which is fixed to the push rod, and has a main body and a first driving arm extending from the main body, and the first driving arm is configured to actuate the button of the auxiliary switch to switch the auxiliary switch between the first state and the second state.

8. The circuit breaker according to claim 7, characterized in that: A proximity switch is also included. The proximity switch is arranged inside the cavity. When the moving contact contacts the stationary contact, the proximity switch is in a first proximity state. When the moving contact is separated from the stationary contact, the proximity switch is in a second proximity state.

9. The circuit breaker according to claim 8, characterized in that The driving portion further includes a second driving arm extending from the main body, and the proximity switch is configured to switch between the first proximity state and the second proximity state based on a distance between the proximity switch and the second driving arm.

10. The circuit breaker according to claim 7, characterized in that: The moving iron core is provided with a limiting hole, and the limiting shaft passes through the limiting hole to limit the movement of the moving iron core along the lateral direction; the driving part is provided with another limiting hole, and the limiting shaft passes through the other limiting hole to limit the movement of the driving part along the lateral direction.

11. The circuit breaker according to claim 4, characterized in that: It also includes a limit plate, which is fixed to the mounting plate and arranged on a side of the moving iron core away from the stationary iron core to limit the movement range of the moving iron core in a direction away from the stationary iron core.

12. A switch cabinet, characterized in that: The invention comprises a trolley and a circuit breaker according to any one of claims 1 to 11, wherein the circuit breaker is assembled on the trolley.

Images