Thermomagnetic tripping device, breaking unit and electrical device

Abstract

The utility model discloses a thermomagnetic tripping device, a breaking unit and an electrical device, and the thermomagnetic tripping device is characterized in that the thermomagnetic tripping device comprises a housing and a conducting bar; the two end parts of the triggering piece in the first direction are respectively pivoted to the shell through a first shaft and a second shaft, and the pivoting movement of the triggering piece triggers the tripping operation of the thermomagnetic tripping device; the magnetic driving assembly is arranged to move in a second direction when being driven and drive the triggering piece to perform pivoting movement; and the thermal deformation part comprises a connecting end part which is directly and electrically connected to the conducting bar, and the thermal deformation part deforms after being subjected to heat exceeding a thermal threshold value so as to enable the triggering part to perform pivoting movement. Wherein the triggering piece is provided with a containing part between the two end parts, the containing part is recessed from the pivoting axis to the magnetic driving assembly, and the actuating end part, opposite to the connecting end part, of the thermal deformation part is located in the containing part in the third direction; and the thermal deformation part and the magnetic driving assembly are close to each other in the third direction.

Description

Technical Field

[0001] The present disclosure relates to the electrical field, and in particular to a thermal-magnetic tripping device, a disconnecting unit including the thermal-magnetic tripping device, and an electrical device. Background Art

[0002] In the prior art, the circuit breaker can have two protection functions: long delay for overload and instantaneous short circuit. The current releases are mainly divided into thermal magnetic releases and electronic releases. The thermal magnetic release is mainly composed of a thermal release component and a magnetic release component. When the current passing through the thermal magnetic release is greater than the rated current and less than the set threshold and lasts for a period of time, the thermal deformation component is bent by heat and pushes the trigger component to achieve tripping and opening. When the power line is short-circuited, the current will instantly increase and reach the set threshold. The magnetic field generated in the magnetic trip component increases, attracting the magnetic drive component to move and push the trigger component to achieve tripping and opening.

[0003] However, the thermal magnetic release device in the prior art has the disadvantages of long conductive path and many electrical contact points, which leads to large internal resistance of the circuit breaker and high temperature rise. At the same time, the circuit breaker using the thermal magnetic release device in the prior art is large in size, the structural layout is not compact enough, and a large installation space is required, which affects its market competitiveness.

[0004] In order to meet the requirements of space, cost and product specificity, a new type of thermal-magnetic release is needed. Utility Model Content

[0005] The purpose of the present disclosure is to at least solve the shortcomings existing in the prior art. The present disclosure proposes a thermal magnetic tripping device, characterized in that it includes: a shell; a conductive row fixed on the shell and conductive; a trigger member, the two ends of which in a first direction are pivotally connected to the shell through a first axis and a second axis respectively, the first axis and the second axis are concentrically arranged so that the trigger member can pivot around a pivot axis along the first direction, and the pivoting movement of the trigger member triggers the tripping operation of the thermal magnetic tripping device; a magnetic drive component extending in a second direction perpendicular to the first direction and arranged on one side of the third direction of the trigger member, the third direction being perpendicular to the first direction and the second direction, the magnetic drive component being arranged to move in the second direction when driven and cause the trigger member to pivot; a thermal deformation component, including a connection end directly electrically connected to the conductive row, the thermal deformation component being deformed after being subjected to heat exceeding a thermal threshold to cause the trigger member to pivot. Wherein, the trigger member has an accommodating portion between the two ends, which is recessed from the pivot axis toward the magnetic drive assembly, and the actuating end of the thermal deformation component opposite to the connecting end is located in the accommodating portion in the third direction, so that the thermal deformation component is adjacent to the magnetic drive assembly in the third direction.

[0006] According to some embodiments of the present disclosure, the thermally deformable component is a plate-shaped component extending along the second direction.

[0007] According to some embodiments of the present disclosure, the thermal deformation component includes a protrusion disposed at the actuating end and protruding toward the trigger member along a third direction, the protrusion being used to impact the trigger member to cause the trigger member to pivot, and a distance by which the protrusion protrudes from the actuating end along the third direction is adjustable.

[0008] According to some embodiments of the present disclosure, the protrusion is provided with a thread, and by screwing the protrusion relative to the actuating end, the distance by which the protrusion protrudes from the actuating end along the third direction can be adjusted.

[0009] According to some embodiments of the present disclosure, the thermal deformation component is a bimetallic strip.

[0010] According to some embodiments of the present disclosure, a biasing member is further included, connected to the trigger member to bias the trigger member to an initial position, in which the trigger member can be actuated to pivot by a magnetic drive assembly or a thermal deformation component.

[0011] According to some embodiments of the present disclosure, the pivotal movement of the trigger member caused by the movement of the magnetic drive assembly does not act on the thermal deformation component, and the pivotal movement of the trigger member caused by the deformation of the thermal deformation component does not act on the magnetic drive assembly.

[0012] According to some embodiments of the present disclosure, two ends of the conductive bar are a stationary contact and a connection terminal, respectively.

[0013] According to some embodiments of the present disclosure, the conductive bar further includes a mounting section extending along the second direction, and the thermal deformation component is installed closely against the mounting section.

[0014] The present disclosure also provides a disconnecting unit, characterized in that it comprises the thermal-magnetic tripping device according to any one of the embodiments of the present disclosure.

[0015] The present disclosure also provides an electrical device, comprising the disconnecting unit according to the present disclosure.

[0016] According to some embodiments of the present disclosure, the electrical device is a circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A three-dimensional schematic diagram showing a thermal-magnetic trip device according to the present disclosure from a first viewing angle;

[0018] Figure 2 From the second perspective Figure 1 A three-dimensional schematic diagram of a thermal-magnetic tripping device;

[0019] Figure 3 Shown in Figure 1 and 2 A plan view of a thermal magnetic tripping device in which, for ease of explanation, a portion of the trigger member is made transparent to show the actuating end in the receiving portion;

[0020] Figure 4 A perspective schematic diagram of an electrical device including a thermal-magnetic trip device according to the present disclosure is shown.

[0021] Reference numerals

[0022] 1 housing,

[0023] 2 conductive bar, 21 static contact, 22 terminal block, 23 mounting section,

[0024] 3 trigger member, 31 first shaft, 32 second shaft, 33 accommodation portion, 34 first driving portion, 35 second driving portion,

[0025] 4 magnetic drive assembly, 41 driving part, 42 avoiding part

[0026] 5 thermal deformation member, 51 connecting end, 52 actuating end, 53 protruding portion,

[0027] 6 biasing pieces,

[0028] 7 disconnect units,

[0029] 8 Electrical installations,

[0030] D1 third direction, D2 second direction, D3 third direction DETAILED DESCRIPTION

[0031] In order to make the purpose, scheme and advantages of the technical solution of the present disclosure clearer, the technical solution of the embodiment of the present disclosure will be clearly and completely described in conjunction with the drawings of the specific embodiments of the present disclosure. Unless otherwise specified, the terms used herein have the usual meanings in the art. The same reference numerals in the drawings represent the same components.

[0032] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0033] For ease of explanation, the extension direction of the pivot axis of the trigger member is designated as the first direction D1, and the movement direction of the magnetic drive assembly is designated as the second direction D2, wherein the first direction D1 and the second direction D2 are perpendicular to each other, and the direction perpendicular to the first direction D1 and the second direction D2 is designated as the third direction D3.

[0034] Figure 1 and Figure 2 A three-dimensional schematic diagram showing a thermal-magnetic trip device according to the present disclosure from two different viewing angles; Figure 3 Shown in Figure 1 and 2 A plan view of a thermal magnetic tripping device in FIG. 1 , wherein for ease of explanation, a portion of the trigger member is made transparent to show the actuating end in the receiving portion. Figures 1 to 3 As shown, the thermal magnetic tripping device according to the present disclosure includes a housing 1 , a conductive bar 2 , a trigger member 3 , a magnetic drive assembly 4 and a thermal deformation component 5 .

[0035] Combination Figures 1 to 3 As shown, the conductive bar 2 can be fixed on the housing and is conductive. The two ends of the conductive bar 2 can be a stationary contact 21 and a wiring terminal 22 respectively. The wiring terminal extends out of the housing 1 for easy wiring.

[0036] The trigger member 3 is pivotally mounted to the housing 1 to pivot about a pivot axis along a first direction D1. In particular, both ends of the trigger member 3 are pivotally connected to the housing 1 via a first shaft 31 and a second shaft 32, respectively, and the first shaft 31 and the second shaft 32 are concentrically arranged so that the trigger member 3 can pivot about the pivot axis. Figure 2 The pivoting movement of the trigger member 3 triggers the tripping operation of the thermal magnetic tripping device, that is, the disconnection operation of the moving contact (not shown) and the stationary contact 21. The trigger member 3 can be actuated by the magnetic drive assembly 4 through the first drive part 34 or the thermal deformation component 5 through the second drive part 35 (as described below), thereby performing the above-mentioned pivoting movement.

[0037] In addition, in order to prevent the trigger member 3 from being triggered by mistake and thus increase the safety and stability of the thermal magnetic tripping device, the thermal magnetic tripping device according to the present disclosure is also provided with a biasing member 6 installed on the trigger member 3 to bias the trigger member 3 in the initial position, such as Figure 2 As shown. Figures 1 to 3 In the initial position shown in FIG. , the trigger member 3 can be actuated by the magnetic drive assembly 4 or the thermal deformation component 5 to pivot, for example Figure 1 The middle is pivoted counterclockwise.

[0038] The magnetic drive assembly 4 extends in the second direction D2 perpendicular to the first direction D1 and is arranged on one side of the third direction D3 of the trigger member, and the third direction D3 is perpendicular to the first direction D1 and the second direction D2. The magnetic drive assembly 4 is arranged to move in the second direction D2 when driven and cause the trigger member to pivot. For example, when the current flowing through the thermal magnetic tripping device exceeds a set threshold, such as in a short circuit, the magnetic drive assembly 4 is driven by magnetic force. Specifically, one end of the magnetic drive assembly 4 adjacent to the trigger member 3 is a driving portion 41, such as Figure 2 As shown, the trigger member 3 is provided with a first driving part 34 , and the driving part 41 can abut against the first driving part 34 in the second direction D2 , so that when the driving part 41 moves away from the trigger member 3 along the second direction D2 , it drives the first driving part 1 to rotate the trigger member 3 .

[0039] Further, the pivoting movement of the trigger member 3 does not in turn act on the magnetic drive assembly 4, that is, the pivoting movement of the trigger member 3 does not in turn cause the magnetic drive assembly 4 to move away from the trigger member 3 in the second direction D2. Figure 2 As shown, the magnetic drive assembly 4 is provided with an escape portion 42 in the direction of the driving portion 41 away from the trigger member 3 along the second direction D2. The escape portion 42 is a cavity, and the driving portion 41 is a wall of the escape portion. The first driving portion 34 may be a finger protruding toward the magnetic drive assembly 4 along the third direction. The escape portion 42 allows the first driving portion 34 to extend into and move therein without interfering with other walls except the driving portion 41, so that the first driving portion 34 can only be driven to pivot by the driving portion 41, and the magnetic drive assembly 4 cannot be caused to move along the second direction D2 away from the trigger member 3 by the first driving portion 34.

[0040] The thermal deformation component 5 includes a connection end that is directly electrically connected to the conductive bar 2. The thermal deformation component 5 is deformed after being subjected to heat exceeding the thermal threshold value to cause the trigger member 3 to pivot, for example, when the current flowing through the conductive bar 2 is greater than the rated current value and less than the set threshold value and continues for a period of time, and the heat generated and absorbed by the thermal deformation component exceeds the thermal threshold value, such as an overload condition. Since the two ends of the conductive bar 2 are the static contact 21 and the terminal 22, respectively, and the thermal deformation component 5 is directly connected to the conductive bar, it has a shorter circuit design, so that the thermal magnetic trip device has a lower temperature rise, or because a higher current is required to deform the thermal deformation component 5, the thermal magnetic trip device can present a higher rated working current.

[0041] Next, the installation and matching relationship between the trigger member 3 and the thermal deformation component 53 is described in detail. Figures 1 to 3The trigger member 3 has a receiving portion 33 between the first shaft 31 and the second shaft 32, which is recessed from the pivot axis toward the magnetic drive assembly 4, and the actuating end 52 of the thermal deformation component 5 opposite to the connecting end 51 is located in the receiving portion 33 in the third direction D3. Therefore, compared with the trigger member 3 with a single-axis connection structure without a receiving portion, the thermal deformation component 5 can be closer to the magnetic drive assembly 4 in the third direction D3, because the single-axis connection structure will block the thermal deformation component 53 in the third direction D3, so that the thermal deformation component 5 and the magnetic drive assembly 4 must be arranged on both sides of the trigger member 3 in the third direction D3, especially on both sides of the pivot axis of the trigger member 3 in the third direction D3. Therefore, the thermal deformation component 5 can be close to the magnetic drive assembly 4, making the thermal magnetic tripping device more compact, so that the disconnecting unit 7 and the electrical device 8 including the thermal magnetic tripping device have a smaller volume, thereby improving market competitiveness.

[0042] like Figures 1 to 3 As shown, the thermal deformation component can be a plate-shaped component extending along the second direction, especially a straight plate-shaped component, so as to reduce power and deformation losses and lower the process cost.

[0043] In addition, the conductive bar 2 may further include a mounting section 23 extending along the second direction D2, and the thermal deformation component 5 may be installed close to the mounting section 23. This facilitates the installation of the thermal deformation component 5, further increases the structural compactness of the thermal magnetic tripping device according to the present disclosure, and increases the contact area to facilitate heat absorption.

[0044] In addition, the thermal deformation component 5 can be a bimetallic strip, which is a composite structure composed of two or more metals or other materials with suitable properties. Due to the different thermal expansion coefficients of various materials, when the temperature changes, the deformation of the active layer is greater than that of the passive layer, so that the entire bimetallic strip will bend toward the passive layer, and the curvature of the composite material changes to produce deformation, so as to bend toward the second driving portion 35 of the trigger member 3 to instruct the trigger member 3 to pivot.

[0045] The thermal deformation component 5 may further include a protrusion 53 disposed at the actuation end 52, the protrusion 53 protruding toward the trigger member 3 along the third direction D3, such as Figure 3 As shown. The protrusion 53 is used to hit the second driving portion 35 of the trigger member 3 to cause the trigger member 3 to pivot. The distance that the protrusion 53 protrudes from the actuating end 52 along the third direction D3 is adjustable. Thus, the deformation amount of the thermal deformation component 5 required to cause the trigger member 3 to pivot can be adjusted, thereby adjusting the above-mentioned thermal threshold, and further adjusting the size of the rated current.

[0046] Specifically, the protrusion 53 is provided with a thread, and the distance of the protrusion 53 protruding from the actuation end 52 along the third direction D3 can be adjusted by screwing the protrusion 53 relative to the actuation end 52. The structure is simple to adjust, can achieve fine adjustment, and has low installation cost.

[0047] The second driving portion 35 may be a wall of the accommodating portion 33 that is transverse to the third direction D3, and the protrusion 53 may be located on a side of the second driving portion 35 that is away from the magnetic driving assembly 4 in the third direction D3. Thus, the protrusion 53 may cause the second driving portion 35 to pivot toward the pivoting magnetic driving assembly 4 by striking the second driving portion 35 of the trigger member 3, and the pivoting of the second driving portion 35 toward the pivoting magnetic driving assembly 4 will not in turn cause the thermally deformable component 5 to deform toward the second driving portion 35.

[0048] Thus, by the cooperation of the first driving part 34 and the second driving part 35 with the magnetic driving assembly 4 and the thermal deformation component 5 respectively, the pivoting movement of the triggering member 3 caused by the movement of the magnetic driving assembly 4 does not act on the thermal deformation component 5, and the pivoting movement of the triggering member 3 caused by the deformation of the thermal deformation component 5 does not act on the magnetic driving assembly 4, that is, the movement of the magnetic driving assembly 4 will not cause the thermal deformation component 5 to deform, and the deformation of the thermal deformation component 5 will not cause the movement of the magnetic driving assembly 4. Thus, the thermal tripping function and the magnetic tripping function are independent and do not affect each other. In addition, other cooperation structures of the first driving part 34 and the second driving part 35 with the magnetic driving assembly 4 and the thermal deformation component 5 respectively can also be adopted, as long as the same non-interaction effect is met.

[0049] Figure 4 FIG. 8 is a perspective schematic diagram of an electrical device 8 including a thermal magnetic trip device according to the present disclosure. Figure 4 As shown, the electrical device 8 according to the present disclosure may include two disconnecting units 7, and each disconnecting unit 7 may include the thermal magnetic tripping device according to the present disclosure. When the moving component 2 of the thermal magnetic tripping device is in the initial position, the moving contact (not shown) is closed with the static contact 21, and when the trigger member 3 is actuated by the magnetic drive component 4 or the thermal deformation component 5 to pivot from the initial position, the moving contact is disconnected from the static contact 21. In addition, when the current in the disconnecting unit 7 is greater than the set threshold, the magnetic drive component 4 causes the trigger member 3 to pivot to complete the disconnecting operation; when the current in the disconnecting unit 7 is greater than the rated current and less than the set threshold and continues for a period of time, the thermal deformation component 5 causes the trigger member 3 to pivot to complete the disconnecting operation. The electrical device 8 according to the present disclosure may also include one, three, and four disconnecting units 7 in equal numbers to meet different application requirements.

[0050] It should be understood that the above description is intended to illustrate rather than limit. For example, the above embodiments (and / or aspects thereof) can be used in combination with each other. In addition, without departing from the scope of the present disclosure, many modifications can be made to adapt specific situations or materials to the teachings of the present disclosure. The functions or performances of the various elements or modules described herein are only for illustration and are by no means restrictive, but are merely exemplary embodiments. After reading the above description, many other embodiments and modifications within the spirit and scope of the claims will be apparent to those skilled in the art. Therefore, the scope of the present disclosure should be determined with reference to the full scope of the equivalents given by the attached claims and these claims.

[0051] In the following claims, the terms “including” and “in which” are used as the plain-English equivalents of the respective terms “comprising” and “wherein.” Furthermore, in the following claims, the terms “first,” “second,” and “first,” etc. are used merely as labels and are not intended to impose numerical requirements on their objects.

Claims

1. A thermal magnetic tripping device, characterized in that: include: case, A conductive bar, fixed to the housing and conducting electricity, A trigger member, wherein two ends in a first direction are pivotally connected to the housing through a first shaft and a second shaft respectively, wherein the first shaft and the second shaft are coaxially arranged so that the trigger member can pivot around a pivot axis along the first direction, and the pivoting movement of the trigger member triggers a tripping operation of the thermal magnetic tripping device, a magnetic drive assembly extending in a second direction perpendicular to the first direction and arranged on one side of the trigger member in a third direction, the third direction being perpendicular to the first direction and the second direction, the magnetic drive assembly being arranged to move in the second direction when driven and causing the trigger member to pivot, a thermal deformation component, comprising a connection end directly electrically connected to the conductive bar, wherein the thermal deformation component is deformed after being subjected to heat exceeding a thermal threshold so as to cause the trigger member to perform a pivoting movement, Wherein, the trigger member has an accommodating portion between the two ends, which is recessed from the pivot axis toward the magnetic drive assembly, and the actuating end of the thermal deformation component opposite to the connecting end is located in the accommodating portion in the third direction, so that the thermal deformation component is adjacent to the magnetic drive assembly in the third direction.

2. The thermal magnetic tripping device according to claim 1, characterized in that: The thermal deformation component is a plate-shaped component extending along the second direction.

3. The thermal magnetic tripping device according to claim 2, characterized in that: The thermal deformation component includes a protrusion disposed at the actuation end and protruding toward the trigger member along a third direction. The protrusion is used to hit the trigger member to cause the trigger member to pivot. The distance by which the protrusion protrudes from the actuation end along the third direction is adjustable.

4. The thermal magnetic tripping device according to claim 3, characterized in that: The protrusion is provided with a thread, and the distance by which the protrusion protrudes from the actuation end along the third direction can be adjusted by screwing the protrusion relative to the actuation end.

5. The thermal magnetic tripping device according to claim 2, characterized in that: The thermal deformation component is a bimetallic strip.

6. The thermal magnetic tripping device according to claim 1, characterized in that: A biasing member is also included, connected to the trigger member to bias the trigger member to an initial position, in which the trigger member can be actuated to pivot by a magnetic drive assembly or a thermal deformation component.

7. The thermal magnetic tripping device according to claim 1, characterized in that: The pivoting movement of the trigger member caused by the movement of the magnetic drive assembly does not act on the thermal deformation component, and the pivoting movement of the trigger member caused by the deformation of the thermal deformation component does not act on the magnetic drive assembly.

8. The thermal-magnetic trip device according to any one of the preceding claims, characterized in that The two ends of the conductive bar are respectively a stationary contact and a connection terminal.

9. The thermal magnetic tripping device according to claim 8, characterized in that: The conductive bar further includes a mounting section extending along the second direction, and the thermal deformation component is installed closely against the mounting section.

10. A breaking unit, characterized in that: It comprises a thermal magnetic tripping device according to any one of claims 1 to 9.

11. An electrical device, characterized in that: Comprising a breaking unit according to claim 10.

12. The electrical device according to claim 11, characterized in that The electrical device is a circuit breaker.

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