Miniature circuit breaker

Abstract

A miniature circuit breaker is characterized in that two supports are respectively and correspondingly formed at positions, corresponding to third mounting parts, of a base and an upper cover, accommodating grooves are formed in the supports, and the corresponding accommodating grooves form a mounting groove for mounting a release; a first limiting groove used for limiting the magnet yoke to move left and right is formed in the side, corresponding to the first support, of the base, and a second limiting groove used for limiting the magnet yoke to move up and down is formed in the position, corresponding to the upper portion of the first support, of the base. Multiple layers of limiting steps are arranged at the upper and lower ends, corresponding to the side edge of the fifth mounting part, of the base and the upper cover; the arc extinguish chamber is at least in positioning fit with one layer of limiting step; a plurality of scale grooves corresponding to the bimetal pieces are further formed in the position, corresponding to the fourth installation part, of the base. The universality of the shell is greatly enhanced, the requirements of different use environments and customers can be met at the same time only by using one shell, the cost is greatly reduced, and the economic benefit is improved.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to a small circuit breaker. Background Art

[0002] The circuit breaker has the characteristics of advanced structure, reliable performance, strong breaking capacity, beautiful and compact appearance, etc. It is used for overload and short-circuit protection of lighting, distribution lines and equipment in office buildings, residential buildings and similar buildings, and can also be used for infrequent on-off operation and conversion of lines.

[0003] The performance requirements of circuit breakers vary in different usage environments, and the actual needs of customers are also different. Therefore, even for the same series of circuit breaker products, manufacturers often need to design multiple shells specifically to achieve different configurations of circuit breakers to meet the needs of different scenarios and different customers. The versatility is poor, which leads to a wide variety of shells and high costs.

[0004] How to improve the versatility of circuit breaker housings, reduce costs, and improve product performance is a technical problem that technical personnel in this field need to develop and solve. Utility Model Content

[0005] In order to overcome the shortcomings of the background technology, the utility model provides a small circuit breaker.

[0006] The technical solution adopted by the utility model is: a small circuit breaker, comprising:

[0007] The housing comprises a base and an upper cover which are connected correspondingly;

[0008] A wiring mechanism, comprising an inlet terminal and an outlet terminal, and respectively mounted on the first mounting parts on the left and right sides of the housing;

[0009] An operating mechanism, which is installed in the second installation part of the housing and is used for opening and closing operations;

[0010] An electromagnetic tripping mechanism, comprising a tripping device and a coil, wherein the tripping device is mounted on a third mounting portion in the housing and corresponds to the operating mechanism;

[0011] A thermal trip mechanism, which is installed in the fourth installation part of the housing, includes a double gold sheet, a double gold pull rod, and an adjusting bolt. One end of the double gold sheet is connected to the incoming line end, one end of the double gold pull rod is connected to the operating mechanism, and the other end corresponds to the free end of the double gold sheet. The adjusting bolt is threadedly connected to the housing and corresponds to one end of the double gold sheet connected to the incoming line end.

[0012] A contact mechanism, comprising a stationary contact and a moving contact, wherein the stationary contact is fixedly mounted in the housing, and the moving contact is mounted on the operating mechanism and corresponds to the stationary contact;

[0013] The arc extinguishing mechanism includes a fifth mounting portion which is an arc extinguishing chamber and is mounted in the housing;

[0014] Two supports are formed correspondingly at the positions of the base and the upper cover corresponding to the third mounting portion, and the supports are formed with receiving grooves, and the corresponding receiving grooves constitute mounting grooves for mounting the release; wherein, a first limiting groove for limiting the left and right movement of the yoke is formed on one side of the base corresponding to the first support, and a second limiting groove for limiting the up and down movement of the yoke is formed on the upper side corresponding to the first support;

[0015] The base and the upper cover are provided with multiple layers of limiting steps at the upper and lower ends corresponding to the side of the fifth mounting portion, and the arc extinguishing chamber is positioned and matched with at least one layer of the limiting steps;

[0016] The base is also provided with a plurality of scale grooves corresponding to the double gold sheets at positions corresponding to the fourth mounting portion.

[0017] The electromagnetic tripping mechanism further includes a yoke, and the yoke includes a bottom plate and side plates arranged on the left and right sides of the bottom plate;

[0018] The yoke is arranged between the base and the releaser, the side plate of the yoke is limitedly matched with the first limit groove, the bottom plate of the yoke is limitedly matched with the second limit groove, and the two side plates of the yoke are also formed with clearance grooves corresponding to the releaser, and the front and rear sides of the side plates of the yoke are respectively limitedly contacted with the base and the releaser.

[0019] The release device comprises an iron core sleeve and a moving iron core, a static iron core, a reset spring and a push rod arranged in the iron core sleeve, forming an integral module structure; the two ends of the coil are respectively welded to the outlet end and the static contact to form an integrated structure, and the coil sleeve is arranged outside the release device.

[0020] The position of the upper cover corresponding to the fourth mounting portion is also provided with a fulcrum boss for supporting the double metal pull rods.

[0021] The arc extinguishing mechanism also includes an upper arc-striking piece. An arc-striking piece mounting groove is also provided above the fifth mounting portion. The upper arc-striking piece is inserted into the arc-striking piece mounting groove, and one end of the upper arc-striking piece is in contact with the static contact.

[0022] The bottom of the shell is also provided with a buckle groove for installing the buckle, and the end of the shell corresponding to the opening of the buckle groove is also provided with an inclined guide groove.

[0023] A transparent observation mirror is provided at a position on the upper end of the shell corresponding to the second mounting portion.

[0024] Anti-electricity theft lock plates are provided at positions at both ends of the shell corresponding to the first mounting portion.

[0025] The beneficial effects of the utility model are: 1. The releaser can be directly fixed and installed by cooperating with the base and the upper cover, and at the same time, a first limit groove and a second limit groove for limiting the yoke are reserved on the base, and whether the yoke is installed or not can be selected according to actual needs; 2. The multi-layer limit steps can realize the positioning and installation of arc extinguishing chambers of different sizes, and arc extinguishing chambers of different sizes can be selected according to actual needs; 3. Scale grooves corresponding to the double gold sheets are formed on the shell, and the double gold sheets can be accurately adjusted to the appropriate position according to actual needs; 4. The upper arc-starting sheet is independently arranged, and an upper arc-starting sheet installation groove is reserved, and whether the upper arc-starting sheet is installed or not can be selected according to actual needs.

[0026] The above solution greatly enhances the versatility of the housing. Only one housing can meet the needs of different usage environments and customers, greatly reducing costs and improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of a miniature circuit breaker according to an embodiment of the utility model.

[0028] Figure 2 This is a schematic diagram of the internal structure of a small circuit breaker according to an embodiment of the utility model.

[0029] Figure 3 It is a structural schematic diagram of the base of an embodiment of the utility model.

[0030] Figure 4 for Figure 3 A magnified schematic diagram of center A.

[0031] Figure 5 for Figure 3 A magnified schematic diagram of point B in the middle.

[0032] Figure 6 It is a schematic structural diagram of the upper cover of an embodiment of the utility model.

[0033] Figure 7 It is a structural schematic diagram of the electromagnetic tripping mechanism of an embodiment of the utility model.

[0034] Figure 8 It is a schematic diagram of the exploded structure of each independent module of the electromagnetic tripping mechanism of the embodiment of the utility model. DETAILED DESCRIPTION

[0035] The embodiments of the utility model are further described below in conjunction with the accompanying drawings.

[0036] As shown in the figure, a small circuit breaker includes a housing 1 and a wiring mechanism 2, an operating mechanism 3, an electromagnetic tripping mechanism 4, a thermal tripping mechanism 5, a contact mechanism 6, and an arc extinguishing mechanism 7 installed in the housing 1, wherein the contact mechanism 6 includes a static contact 61 and a moving contact 62, the static contact 61 is fixedly installed in the housing 1, and the moving contact 62 is installed on the contact bracket 31 of the operating mechanism 3 and corresponds to the static contact 61.

[0037] The housing 1 includes a base 101 and an upper cover 102 which are connected to each other. A first mounting portion 11 , a second mounting portion 12 , a third mounting portion 13 , a fourth mounting portion 14 , and a fifth mounting portion 15 are formed inside the housing 1 .

[0038] The first mounting part 11 is located on the left and right sides of the housing 1. The wiring mechanism 2 includes an input terminal 21 and an output terminal 22, which are respectively installed in the first mounting parts 11 on the left and right sides of the housing 1. The input terminal 21 and the output terminal 22 both include a wiring frame, a wiring board and a wiring bolt. The first mounting part 11 forms a wiring port 111 at a position corresponding to the wiring frame, and the first mounting part 11 forms an operating port 112 at a position corresponding to the wiring bolt to facilitate wiring operations. Among them, anti-theft lock plates 10 are provided at positions corresponding to the first mounting parts 11 at both ends of the housing 1. The anti-theft lock plates 10 are hinged to the housing 1, and a padlock ring 113 is formed on the housing. The anti-theft lock plates 10 can cover and block the operating port 112 and lock it with a padlock to achieve the purpose of preventing electricity theft and make electricity use safer.

[0039] The second mounting portion 12 is located on the upper side of the housing 1, and the operating mechanism 3 is mounted on the second mounting portion 12 in the housing 1 to realize the opening and closing operation. The operating mechanism 3 includes a handle 31, a U-shaped connecting rod 32, a contact bracket 33, a lever 34, a trip button 35, and a lock button 36. The handle 31 is rotatably mounted on the housing 1, and the contact bracket 33 and the lever 34 are coaxially rotatably mounted in the housing 1. The trip button 35 is rotatably mounted on the lever 34 and is linked with the handle 31 through the U-shaped connecting rod 32. The lock button 36 is rotatably mounted on the lever 34 and can be locked with the trip button 35. Among them, an opening and closing indication mark is formed on the lever 34, and a transparent observation mirror 9 is provided at the upper end of the housing 1 corresponding to the position of the second mounting portion 12. The opening and closing indication mark can be observed through the transparent observation mirror 9, so as to facilitate the observation of the opening and closing state of the circuit breaker.

[0040] Two supports 131 are formed at the positions of the base and the upper cover corresponding to the third mounting portion 13, and a receiving groove 132 is formed on the support 131. The corresponding receiving groove 132 forms a mounting groove. Among them, the base 101 is formed with a first limiting groove 133 for limiting the left and right movement of the yoke 43 on one side corresponding to the first support 131, and a second limiting groove 134 for limiting the up and down movement of the yoke 43 is formed on the upper side corresponding to the first support 131.

[0041] The electromagnetic tripping mechanism 4 is mounted on the third mounting portion 13 in the housing 1, and corresponds to the lock of the operating mechanism 3, and is used for electromagnetic automatic tripping under short circuit. The electromagnetic tripping mechanism 4 includes a tripping device 41, a coil 42, and a yoke 43. The tripping device 41 includes an iron core sleeve 411, and a moving iron core 412, a static iron core 413, a reset spring, and a push rod 414 arranged in the iron core sleeve 411. The tripping device 41 constitutes an integral independent module structure, and is mounted in the mounting groove, and is clamped and fixed by the base and the support 131 of the upper cover.

[0042] The two ends of the coil 42 are respectively welded to the wiring board of the outlet terminal 22 and the static contact 61 to form an integrated structure, and the coil 42 is sleeved outside the release 41 .

[0043] The yoke 43 includes a bottom plate 431 and side plates 432 arranged on the left and right sides of the bottom plate 431; the yoke 43 is arranged between the base 101 and the releaser 41, the side plates 432 of the yoke 43 are limitedly matched with the first limiting groove 133, the bottom plate 431 of the yoke 43 is limitedly matched with the second limiting groove 134, and the two side plates 432 of the yoke 43 are also formed with clearance grooves 433 corresponding to the releaser 41, and the front and rear sides of the side plates 432 of the yoke 43 are respectively limitedly contacted with the base 101 and the releaser 41.

[0044] In the above-mentioned electromagnetic tripping mechanism 4, the tripper 41, the coil 42, and the yoke 43 are all independent integral modules, and the assembly operation is more convenient. In addition, the tripper 41 can be directly fixedly installed by cooperating with the base and the upper cover, and the yoke 43 can be selectively installed according to actual needs. When the above-mentioned circuit breaker is a B-type circuit breaker, the tripping mechanism may not be provided with a yoke, and omitting the yoke can further reduce the cost. When the above-mentioned circuit breaker is a C-type or D-type circuit breaker, the yoke 43 is inserted into the first limiting groove 133 and the second limiting groove 134, and the yoke 43 is positioned by the base 101 and the tripper 41, and the installation is also very convenient.

[0045] The thermal trip mechanism 5 is installed on the fourth mounting portion 14 in the shell 1, and is used for thermal deformation tripping under overload conditions. The thermal trip mechanism 5 includes a double gold sheet 51, a double gold pull rod 52, and an adjusting bolt 53. One end of the double gold sheet 51 is connected to the terminal block of the incoming line terminal 21, and the other end is a free end. One end of the double gold pull rod 52 is connected to the lock of the operating mechanism 3, and the other end corresponds to the free end of the double gold sheet 51. The adjusting bolt 53 is threadedly connected to the shell 1 and corresponds to one end of the double gold sheet 51 connected to the incoming line terminal 21. The angular position of the double gold sheet 51 can be adjusted by adjusting the bolt 53.

[0046] A plurality of scale grooves 141 corresponding to the double gold sheets 51 are formed at the position of the base corresponding to the fourth mounting portion 14 , so that the position of the double gold sheets 51 can be accurately adjusted with the scale grooves 141 as a reference.

[0047] In addition, the upper cover 102 is provided with a fulcrum boss 142 for supporting the double metal pull rod 52 at a position corresponding to the fourth mounting portion 14. Adding a fulcrum can increase the force arm of the double metal pull rod 52, reduce the release force, and improve product performance.

[0048] The base and the upper cover are provided with multiple layers of limiting steps 151 at the upper and lower ends of the side of the fifth mounting portion 15, and an arc-striking piece installation groove 152 is also provided above the fifth mounting portion 15. The arc-extinguishing mechanism 7 is installed on the fifth mounting portion 15 in the housing 1, and includes an arc-extinguishing chamber 71, an upper arc-striking piece 72, and a lower arc-striking piece 73. The arc-extinguishing chamber 71 forms a positioning match with one layer of the limiting steps 151. The upper arc-striking piece 72 is located on the upper side of the arc-extinguishing chamber 71 and is inserted into the arc-striking piece installation groove 152, and one end of the upper arc-striking piece 72 is in contact with the static contact 61. The lower arc-striking piece 73 is located on the lower side of the arc-extinguishing chamber 71, and one end of the lower arc-striking piece 73 is fixedly connected to the double gold sheet 51.

[0049] Among them, arc extinguishing chambers of different sizes and specifications can be limited by limiting steps at different positions, so that one shell can meet the installation requirements of arc extinguishing chambers of various specifications, with better versatility and further cost reduction.

[0050] In addition, the upper arc-starting piece 72 is independently arranged and positioned and installed through the arc-starting piece installation groove 152, which can not only ensure the arc-starting effect and ensure the reliable operation of the arc-extinguishing cover, but also the upper arc-starting piece 72 can be made of cheaper material to further reduce costs.

[0051] The bottom of the shell 1 is also provided with a buckle groove 16 for installing the buckle 8, and the end of the shell 1 corresponding to the opening of the buckle groove 16 is also provided with an inclined guide groove 17. The inclined guide groove 17 not only saves installation space, but also makes it more convenient to disassemble and assemble the buckle 8.

[0052] The use of the above small circuit breakers can mainly achieve the following effects:

[0053] 1. The release can be directly fixed and installed by the base and the upper cover. At the same time, the first limit groove and the second limit groove for the yoke limit are reserved on the base. Whether to install the yoke can be selected according to actual needs;

[0054] 2. The multi-layer limit steps can realize the positioning and installation of arc extinguishing chambers of different sizes, and arc extinguishing chambers of different sizes can be selected according to actual needs;

[0055] 3. A scale groove corresponding to the double gold sheet is formed on the shell, and the double gold sheet can be accurately adjusted to the appropriate position according to actual needs;

[0056] 4. The upper arc-starting piece is set independently, and a slot for installing the upper arc-starting piece is reserved. You can choose whether to install the upper arc-starting piece according to actual needs;

[0057] 5. The releaser, coil and yoke form independent modules, which is convenient for the overall disassembly and assembly of the electromagnetic release mechanism;

[0058] 6. Set up an anti-theft lock plate to prevent electricity theft and ensure electricity safety;

[0059] 7. Equipped with a transparent observation mirror, it is convenient to observe the opening and closing status and realize status indication;

[0060] 8. Add fulcrum boss to provide fulcrum for double metal pull rod, increase force arm and reduce tripping force;

[0061] 9. Add inclined guide grooves to save product safety space and make buckle disassembly and assembly more convenient.

[0062] The use of the above small circuit breakers not only greatly enhances the versatility of the shell, but also uses only one shell to meet the needs of different usage environments and customers, greatly reducing costs and improving economic benefits. It also optimizes the structure, facilitates disassembly and assembly, and improves the tripping protection performance.

[0063] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0064] In the description of the present utility model, 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 utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0065] Technical personnel should note: Although the utility model has been described according to the above specific implementation methods, the utility model concept of the utility model is not limited to this utility model. Any modification using the utility model concept will be included in the scope of protection of this patent right.

Claims

1. A miniature circuit breaker, comprising: The housing (1) comprises a base (101) and an upper cover (102) which are connected correspondingly; A wiring mechanism (2), comprising an inlet terminal (21) and an outlet terminal (22), and respectively mounted on the first mounting portion (11) on the left and right sides of the housing (1); An operating mechanism (3) mounted on a second mounting portion (12) in the housing (1) and used for opening and closing operations; An electromagnetic tripping mechanism (4), comprising a tripping device (41) and a coil (42), wherein the tripping device (41) is mounted on a third mounting portion (13) in the housing (1) and corresponds to the operating mechanism (3); A thermal release mechanism (5) is mounted on a fourth mounting portion (14) in the housing (1), comprising a double gold sheet (51), a double gold pull rod (52), and an adjusting bolt (53); one end of the double gold sheet (51) is connected to the incoming line terminal (21); one end of the double gold pull rod (52) is connected to the operating mechanism (3), and the other end corresponds to the free end of the double gold sheet (51); the adjusting bolt (53) is threadedly connected to the housing (1) and corresponds to one end of the double gold sheet (51) connected to the incoming line terminal (21); A contact mechanism (6), comprising a stationary contact (61) and a moving contact (62), wherein the stationary contact (61) is fixedly mounted in the housing (1), and the moving contact (62) is mounted on the operating mechanism (3) and corresponds to the stationary contact (61); An arc extinguishing mechanism (7), comprising a fifth mounting portion (15) in the form of an arc extinguishing chamber (71) and mounted in the housing (1); The invention is characterized in that two supports (131) are formed correspondingly at positions of the base and the upper cover corresponding to the third mounting portion (13), and a receiving groove (132) is formed on the support (131), and the corresponding receiving groove (132) constitutes a mounting groove for mounting the release (41); wherein a first limiting groove (133) for limiting the left and right movement of the magnetic yoke (43) is formed on one side of the base (101) corresponding to the first support (131), and a second limiting groove (134) for limiting the up and down movement of the magnetic yoke (43) is formed on the upper side corresponding to the first support (131); The base and the upper cover are provided with multiple layers of limiting steps (151) at the upper and lower ends of the side corresponding to the fifth mounting portion (15), and the arc extinguishing chamber (71) is positioned and matched with at least one layer of the limiting steps (151); A plurality of scale grooves (141) corresponding to the double gold sheets (51) are also formed at positions of the base corresponding to the fourth mounting portion (14).

2. The miniature circuit breaker according to claim 1, characterized in that: The electromagnetic tripping mechanism (4) further comprises a yoke (43), wherein the yoke (43) comprises a bottom plate (431) and side plates (432) arranged on the left and right sides of the bottom plate (431); The yoke (43) is arranged between the base (101) and the release (41); the side plate (432) of the yoke (43) is in position-limiting cooperation with the first limit groove (133); the bottom plate (431) of the yoke (43) is in position-limiting cooperation with the second limit groove (134); two side plates (432) of the yoke (43) are also formed with clearance grooves (433) corresponding to the release (41); and the front and rear sides of the side plates (432) of the yoke (43) are in position-limiting contact with the base (101) and the release (41), respectively.

3. The miniature circuit breaker according to claim 2, characterized in that: The release device (41) comprises an iron core sleeve (411), and a moving iron core (412), a static iron core (413), a reset spring and a push rod (414) arranged in the iron core sleeve (411), forming an integral module structure; Two ends of the coil (42) are respectively welded to the outlet terminal (22) and the static contact (61) to form an integrated structure, and the coil (42) is sleeved outside the release (41).

4. The miniature circuit breaker according to claim 1, characterized in that: The upper cover (102) is also provided with a fulcrum boss (142) for supporting the double metal pull rod (52) at a position corresponding to the fourth mounting portion (14).

5. The miniature circuit breaker according to claim 1, characterized in that: The arc extinguishing mechanism (7) further comprises an upper arc striking piece (72), an arc striking piece mounting groove (152) is further provided above the fifth mounting portion (15), the upper arc striking piece (72) is inserted into the arc striking piece mounting groove (152), and one end thereof is in contact with the stationary contact (61).

6. The miniature circuit breaker according to claim 1, characterized in that: The bottom of the housing (1) is also provided with a buckle groove (16) for installing the buckle (8), and an end of the housing (1) corresponding to the opening of the buckle groove (16) is also provided with an inclined guide groove (17).

7. The miniature circuit breaker according to claim 1, characterized in that: A transparent observation mirror (9) is provided at a position on the upper end of the housing (1) corresponding to the second mounting portion (12).

8. The miniature circuit breaker according to claim 1, characterized in that: Anti-electricity theft lock plates (10) are provided at positions at both ends of the housing (1) corresponding to the first mounting portions (11).

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