Dual-gold protection device and circuit breaker

Abstract

The bimetal protection device and circuit breaker provided by the present invention belong to the technical field of circuit breakers. Among them, the bimetal protection device includes: a bimetal sheet, which is suitable for being arranged inside the housing of the electrical switch device, with one end being a connection end and the other end being a free end, and the connection end is suitable for connecting with the static contact of the electrical switch device; a support spring sheet, which is of a bent structure and has a support arm for connecting inside the housing and an adjustment arm for connecting with the connection end of the bimetal sheet. The distance between the adjustment arm and the support arm is suitable for being adjusted by an adjustment screw. In the bimetal protection device of the present invention, the connection end of the bimetal sheet is connected to the housing through the support spring sheet. When adjusting the angular position of the bimetal sheet, it is adjusted by adjusting the bending angle of the support spring sheet. Therefore, on the premise of ensuring the conductivity of the bimetal sheet, by improving the elasticity of the support spring sheet, the adjustment of the angular position of the bimetal sheet can be made more convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and particularly to a double-metal protection device and a circuit breaker. Background Art

[0002] A circuit breaker is a switching device that can carry and break the current under abnormal circuit conditions within a specified time. Inside the circuit breaker, there are a moving contact and a static contact that can perform the on-off operation, and the moving contact is driven by an operating mechanism.

[0003] In a circuit breaker, a double-metal protection device is used for overload protection. The double-metal protection device has a bimetal sheet that can be deformed by heat. When the load device is overloaded, the current increases at the bimetal sheet, causing the bimetal sheet to be heated and deformed towards the operating mechanism, thereby driving the operating mechanism to disconnect the moving contact and the static contact. The bimetal sheet is installed inside the housing of the circuit breaker, and its position angle needs to be adjusted so that when an overload occurs, the bimetal sheet can drive the operating mechanism through deformation. Therefore, the bimetal sheet of the double-metal protection device needs to have good electrical conductivity and good elasticity for easy adjustment to meet the actual needs.

[0004] However, in practice, in order to meet the electrical conductivity of the bimetal sheet, its elasticity is often inevitably reduced, making the adjustment of the bimetal sheet more laborious. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the bimetal sheet of the double-metal protection device in the prior art is not easy to adjust, so as to provide a double-metal protection device and a circuit breaker with the double-metal protection device.

[0006] To solve the above technical problem, the present invention provides a double-metal protection device for driving the execution of the operating mechanism of an electrical switching device, including:

[0007] A bimetal sheet, adapted to be arranged inside the housing of the electrical switching device, with one end being a connection end and the other end being a free end, and the connection end is adapted to be connected to the static contact of the electrical switching device;

[0008] A support spring sheet, having a bent structure, with a support arm for connecting inside the housing and an adjustment arm for connecting to the connection end of the bimetal sheet, and the distance between the adjustment arm and the support arm is adapted to be adjusted by an adjustment screw.

[0009] As a preferred solution, an extension piece extending towards one side direction is provided on the adjustment arm of the support spring sheet, and the bimetal sheet is connected to the support spring sheet as a whole through the extension piece.

[0010] As a preferred solution, the bimetal piece and the support spring piece are integrally connected by welding.

[0011] As a preferred solution, it further includes: an adjusting screw, having an abutting head adapted to abut against the inner wall of the support arm, and the abutting head is an arc-shaped structure.

[0012] As a preferred solution, on the inner wall of the support arm of the support spring piece, there is a positioning groove corresponding to the abutting head.

[0013] As a preferred solution, the adjusting arm of the support spring piece has a threaded hole, and the adjusting screw is adapted to pass through the adjusting arm and then abut against the inner wall of the support arm.

[0014] As a preferred solution, it further includes: a static contact, connected to the connection end of the bimetal piece, and having a static contact point for contacting the moving contact.

[0015] As a preferred solution, the static contact has a positioning plate extending towards the side.

[0016] As a preferred solution, the static contact is provided with a positioning boss, and the static contact point abuts against one side of the positioning boss. When the static contact point is welded to the static contact, this positioning boss can play an auxiliary positioning effect, which is beneficial to welding the static contact point.

[0017] As a preferred solution, the static contact has a deformed section for connecting with the bimetal piece, and the deformed section is in a bent shape.

[0018] As a preferred solution, the thickness of the deformed section is less than the average thickness of the static contact.

[0019] As a preferred solution, the static contact has an arc guide plate extending in a direction away from the direction where the static contact point is located.

[0020] As a preferred solution, the static contact and the bimetal piece are integrally connected by welding.

[0021] The present invention also provides a circuit breaker, including the bimetal protection device according to any one of the above solutions.

[0022] The technical solution of the present invention has the following advantages:

[0023] 1. For the bimetal protection device provided by the present invention, the connection end of the bimetal piece is connected to the housing through the support spring piece. When adjusting the angular position of the bimetal piece, it is adjusted by adjusting the bending angle of the support spring piece. Thus, on the premise of ensuring the conductivity of the bimetal piece, by improving the elasticity of the support spring piece, the angular position adjustment of the bimetal piece can be made more convenient.

[0024] 2. The double-metal protection device provided by the present invention. Since the support spring plate does not need to meet the electrical conductivity requirement, a material with better elasticity can be selected. By using the support spring plate, the problem of reducing the force for adjusting the bimetal sheet is solved, ensuring the feel of calibrating the bimetal sheet, and thus improving the qualified rate of calibrating the bimetal sheet.

[0025] 3. The double-metal protection device provided by the present invention has an extension piece extending in one side direction on the adjustment arm of the support spring plate. The bimetal sheet is connected to the support spring plate as a whole through the extension piece. With this setting, the arrangement problem of the bimetal sheet in a small area is solved, so that the deformation of the bimetal sheet and the adjustment of the support spring plate do not interfere with each other.

[0026] 4. For the double-metal protection device provided by the present invention, the top contact head of the adjustment screw used to adjust the support spring plate is of an arc structure, which can protect the support spring plate from damage during the screwing process and improve the service life.

[0027] 5. The double-metal protection device provided by the present invention has a positioning groove corresponding to the contact head of the adjustment screw on the inner wall of the support arm of the support spring plate. Through the positioning groove, the contact head of the adjustment screw can be prevented from slipping on the support spring plate, thereby improving the accuracy of adjustment.

[0028] 6. The double-metal protection device provided by the present invention has a positioning plate extending towards the side on the static contact head, which is convenient for placing and positioning the static contact head when installing the static contact head into the housing.

[0029] 7. The double-metal protection device provided by the present invention has a deformation section for connecting with the bimetal sheet on the static contact head. The deformation section is in a bent shape and is used to adapt to the deformation of the bimetal sheet. The thickness of the deformation section is less than the average thickness of the static contact head, so as to reduce the force required for the deformation section to deform, and further make the angular position adjustment of the bimetal sheet easier.

[0030] 8. The double-metal protection device provided by the present invention has an arc guiding plate extending in a direction away from the static contact point on the static contact head. Through this arc guiding plate, the arc is guided to transfer and concentrate at a preset position.

[0031] 9. The circuit breaker provided by the present invention has the advantages described in any one of the above due to having the double-metal protection device described in any one of the above. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 This is a schematic diagram of the three-dimensional structure of an embodiment of the dual-metal protection device of the present invention;

[0034] Figure 2 for Figure 1 A schematic diagram of a three-dimensional structure from an upward viewing angle;

[0035] Figure 3 for Figure 1 Schematic diagram of the three-dimensional structure of the middle supporting spring;

[0036] Figure 4 A schematic diagram of the internal structure of a circuit breaker according to an embodiment of the present invention;

[0037] Figure 5 for Figure 4 Magnified view of area A in center.

[0038] Description of reference numerals:

[0039] 1. Bimetallic strip; 2. Support spring; 3. Static contact; 4. Free end; 5. Extension piece; 6. Deformation section; 7. Static contact; 8. Arc starter; 9. Support arm; 10. Adjustment arm; 11. Adjustment screw; 12. Abutment; 13. Positioning groove; 14. Housing; 15. Moving contact; 16. Lock; 17. Positioning plate; 18. Positioning boss. DETAILED DESCRIPTION

[0040] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0042] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0044] Embodiment 1

[0045] This embodiment provides a specific implementation manner of a bimetal protection device. The bimetal protection device drives its operating mechanism to trip in the abnormal state of the electrical switch device. Specifically, when the current in the electrical switch device is overloaded, the bimetal protection device provided in the electrical switch device is affected by the current and can drive the operating mechanism in the electrical switch device to perform a power-off operation. In practical applications, for example, switch devices for power protection such as circuit breakers and the like.

[0046] As Figure 1 、 Figure 2 shown, the bimetal protection device provided in this embodiment includes: a bimetal sheet 1, a support spring sheet 2 and a static contact 3 that are respectively connected to the bimetal sheet 1. The bimetal sheet 1 is adapted to be arranged in the housing 14 of the electrical switch device. One end of the bimetal sheet 1 is a connection end, and the other end is a free end 4. When the current passing through the bimetal sheet 1 is too large, it is heated and deformed itself, so that the free end 4 moves in the direction of driving the operating mechanism in the electrical switch device, thereby driving the execution of the operating mechanism. The static contact 3 has two positioning plates 17 extending respectively towards both sides. When installing the static contact 3, the static contact 3 is positioned by inserting the positioning plates 17 into the grooves in the housing, ensuring the contact between the moving contact and the static contact, which is beneficial to reducing the burning time of the arc at the contact points and reducing the loss of the contact points.

[0047] As Figure 1 shown, both the support spring sheet 2 and the static contact 3 are connected to the connection end of the bimetal sheet 1 by welding. Specifically, the adjustment arm 10 of the support spring sheet 2 has an extension piece 5 extending in one direction, and the bimetal sheet 1 is welded and connected to the support spring sheet 2 as a whole through the extension piece 5.

[0048] As Figure 2As shown, the static contact 3 has a deformation section 6 for connecting with the bimetallic strip 1, and the deformation section 6 is in a bent shape. The thickness of the deformation section 6 is less than the average thickness of the static contact 3, so as to reduce the verification resistance when verifying the angular position of the bimetallic strip 1 and make the adjustment of the angular position of the bimetallic strip 1 easier.

[0049] As Figure 2 shown, the static contact 3 has a static contact point 7 for contacting with the moving contact 15. The static contact point 7 is a protruding bump, which abuts against the positioning boss 18 of the static contact through this bump. The positioning boss 18 can play an auxiliary positioning effect, thus solving the placement and positioning problem of the static contact point 7. When contacting with the moving contact 15, the burning time of the arc on the static contact point 7 is reduced, which is beneficial to reducing the loss of the static contact point 7.

[0050] The static contact 3 has an arc guiding plate 8 extending in a direction away from the static contact point 7. Through this arc guiding plate 8, the arc is guided to transfer and concentrate to a preset position.

[0051] As Figure 3 shown, the support spring piece 2 is in a bent structure. The support spring piece 2 has a support arm 9 for connecting inside the housing 14, and the support spring piece 2 also has an adjustment arm 10 for connecting with the connection end of the bimetallic strip 1. The distance between the adjustment arm 10 and the support arm 9 is suitable for adjustment by an adjustment screw 11. The adjustment arm 10 of the support spring piece 2 has a threaded hole, and the adjustment screw 11 is adjusted by abutting against the inner wall of the support arm 9 after passing through the threaded hole. On the inner wall of the support arm 9 of the support spring piece 2, there is a positioning groove 13 corresponding to the abutting head 12 of the adjustment screw 11, and the abutting head 12 of the adjustment screw 11 is in an arc shape.

[0052] Usage

[0053] As Figure 4 、 Figure 5 shown, after installing the above-mentioned bimetal protection device into the housing 14 of the electric switch device, when adjusting the angular position of the bimetallic strip 1, first pass the adjustment screw 11 through the adjustment arm 10 of the support spring piece 2, so that the abutting head 12 of the adjustment screw 11 abuts in the positioning groove 13 on the inner wall of the support arm 9 of the support spring piece 2.

[0054] Then, by screwing the adjustment screw 11, adjust the distance between the support arm 9 and the adjustment arm 10 of the support spring piece 2. Since the support arm 9 of the support spring piece 2 is relatively clamped and fixed inside the housing 14, therefore, under the action of the adjustment screw 11, the adjustment arm 10 makes a relative displacement.

[0055] Driven by the adjusting arm 10, the deformation section 6 of the static contact 3 undergoes slight deformation, thereby causing the bimetallic strip 1 to move, and realizing the adjustment of the angular position of the bimetallic strip 1 within the housing 14.

[0056] Embodiment 2

[0057] This embodiment provides a specific implementation manner of a circuit breaker, as Figure 4 , Figure 5 shown, including: the bimetallic protection device described in Embodiment 1, which is arranged within the housing 14 of the circuit breaker. There is also a moving contact 15 within the housing 14, and the moving contact 15 is arranged opposite to the static contact 3 of the bimetallic protection device.

[0058] There is an operating mechanism within the housing 14 of the circuit breaker. This operating mechanism has a latch 16, and the operating mechanism performs the contact and separation between the moving contact 15 and the static contact 3 through the rotation of the latch 16.

[0059] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. A double-gold protection device, characterized in that, Comprising: A bimetallic strip (1), adapted to be disposed within a housing (14) of an electrical switch device, having one end as a connection end and the other end as a free end (4), wherein the connection end is adapted to be connected to a stationary contact (3) of the electrical switch device; A support spring piece (2), having a bent structure, with a support arm (9) for connection within the housing (14) and an adjustment arm (10) for connection to the connection end of the bimetallic strip (1), the spacing between the adjustment arm (10) and the support arm (9) being adapted to be adjusted by an adjustment screw (11); A stationary contact (3), connected to the connection end of the bimetallic strip (1), having a stationary contact point (7) for contact with a moving contact (15), the stationary contact (3) having a deformation section (6) for connection to the bimetallic strip (1), the deformation section (6) being of a bent shape and having a thickness less than the average thickness of the stationary contact (3).

2. The double-gold protection device according to claim 1, wherein The adjustment arm (10) of the support spring piece (2) has an extension piece (5) extending in one side direction, and the bimetallic strip (1) is integrally connected to the support spring piece (2) through the extension piece (5).

3. The double-gold protection device according to claim 2, wherein The bimetallic strip (1) and the support spring piece (2) are integrally connected by welding.

4. The double-gold protection device according to any one of claims 1-3, characterized in that Further comprising: An adjustment screw (11), having an abutting head (12) adapted to abut against the inner wall of the support arm (9), the abutting head (12) being of an arc-shaped structure.

5. The double-gold protection device according to claim 4, characterized in that, On the inner wall of the support arm (9) of the support spring piece (2), there is a positioning groove (13) corresponding to the abutting head (12).

6. The double-gold protection device according to any one of claims 1-3, characterized in that, The stationary contact (3) has a positioning plate (17) protruding towards the side; The stationary contact is provided with a positioning boss (18), and the stationary contact point abuts against one side of the positioning boss.

7. The double-gold protection device according to any one of claims 1-3, characterized in that, The stationary contact (3) has an arc guide plate (8) extending in a direction away from the direction where the stationary contact point (7) is located.

8. A circuit breaker, characterized in that, Comprising the bimetal protection device according to any one of claims 1-7.

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