Static contact mounting structure of universal circuit breaker

Abstract

The utility model discloses a static contact mounting structure of a universal circuit breaker, which comprises a static busbar, an insulating gasket and an arc striking sheet which are sequentially connected and mounted on a bottom plate. The first positioning structure comprises a busbar positioning hole and a busbar positioning groove which are arranged on the bottom plate, and a positioning convex block arranged at one end of the static busbar, one end of the static busbar is clamped into the busbar positioning groove through the positioning convex block to form positioning fit, and the other end of the static busbar is inserted into the busbar positioning hole in a positioning manner and extends out of the outer side of the bottom plate; and finally, the positioned static busbar and the bottom plate are fastened by a screw structure, so that the static contact is mounted and fixed, the static busbar is simple in mounting structure, more accurate in positioning and favorable for improving the mounting efficiency, the consistency among the multi-phase static contacts is better due to the mounting design, and the electrical performance of a product can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a static contact installation structure of a universal circuit breaker. Background Art

[0002] Universal circuit breaker is a kind of mechanical switch that can connect, carry and disconnect the current under normal circuit conditions, and can also connect, carry a certain time and disconnect the current under specified abnormal conditions, and protect the distribution line from overload and short circuit faults. Among them, the contact system is an important part of the universal circuit breaker, and its performance parameters and operating performance directly affect the various technical indexes of the circuit breaker.

[0003] Existing frame-type circuit breakers usually include a drawer seat, an operating mechanism, a contact system, a conductive system, an arc extinguishing system and other mechanisms. For example, Chinese patent document CN206516595U discloses a frame-type circuit breaker contact system, including a shell, a moving contact assembly, an arc extinguishing device, an upper working busbar and a lower working busbar. The lower working busbar is fixedly arranged on the heat dissipation seat and electrically connected to the moving contact assembly. The upper working busbar is L-shaped, including an integrally arranged transverse busbar and a longitudinal busbar. The transverse busbar is parallel to the lower working busbar and is arranged on the longitudinal busbar at one end away from the lower working busbar. The longitudinal busbar is provided with an arc-striking piece and a static contact piece. Combined with the drawings of the document, it can be seen that the upper working busbar and the arc-striking piece are fixed to the bottom shell by screws, and the upper working busbar and the static contact piece form a static contact structure that cooperates with the moving contact. It can be seen from the above structure that although the upper busbar is made into an L-shaped structure to increase the distance with the lower busbar to reduce the temperature rise of the product, this upper busbar is only fixed to the shell by multiple screws, and the installation is not convenient, resulting in poor installation consistency between multi-phase static contacts, affecting the electrical performance of the product; secondly, the space utilization rate of the upper busbar installed in this way is low, which may easily lead to insufficient opening distance between the moving and static contacts, which is not conducive to arc extinguishing. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the problem in the prior art that the upper busbar is only fixed to the housing by multiple screws, which is inconvenient to install, resulting in poor installation consistency between multi-phase static contacts and affecting the electrical performance of the product.

[0005] In order to solve the above problems, the utility model provides a static contact installation structure of a universal circuit breaker, comprising a static busbar installed on a base plate and a static contact arranged on the static busbar, the static busbar is a bent structure and a first positioning structure for maintaining the relative position of the two is arranged between the static busbar and the base plate, the first positioning structure comprises a busbar positioning hole and a busbar positioning groove arranged on the base plate at upper and lower intervals, and a positioning protrusion arranged at one end of the static busbar and plugged into the busbar positioning groove, one end of the static busbar is inserted into the busbar positioning groove through the positioning protrusion to form a positioning fit, and the other end is positioned and inserted into the busbar positioning hole and extends out of the base plate; the static busbar and the base plate are fixedly connected by a first screw structure while maintaining the positioning fit.

[0006] As a preferred embodiment, the base plate has a protrusion formed on its outer wall protruding outward, and a recessed portion formed on the inner side of the base plate corresponding to the protrusion, the busbar positioning hole and the busbar positioning groove are respectively arranged on the upper and lower sides of the recessed portion, and the static busbar is bent and extended to be connected to the recessed portion.

[0007] As a preferred embodiment, the static busbar includes an upper end inserted into the busbar positioning hole, a lower end provided with the positioning protrusion, and a bending portion bent to connect the upper end and the lower end, and the bending portion is respectively connected to the upper end and the lower end in a Z shape.

[0008] As a preferred solution, the cross-sectional shape of the recessed portion is L-shaped, and a limiting boss is formed on its lower side, the limiting boss is provided with a busbar positioning groove, and the bent portion is positioned and connected in the recessed portion in a matching manner.

[0009] As a preferred solution, a first fixing hole is provided on the base plate, a first connecting hole corresponding to the first fixing hole is provided on the bending portion, and the screw structure passes through the first connecting hole and is fixed in the first fixing hole to fix the static busbar on the base plate.

[0010] As a preferred solution, it also includes an insulating gasket and an arc-striking plate arranged on the static busbar, a second positioning structure forming a positioning match with the insulating gasket is arranged between the static busbar and the base plate, and a third positioning structure forming a positioning match with the arc-striking plate is arranged on the insulating gasket. The insulating gasket is semi-wrapped and sleeved on the static busbar and cooperates with the sealing busbar positioning hole. The insulating gasket and the arc-striking plate are fixedly connected to the base plate by a second screw structure in the positioning state.

[0011] As a preferred embodiment, the second positioning structure includes a second positioning groove formed between the static busbar and the busbar positioning hole, and the insulating gasket has a positioning cover plate that is matched and inserted into the second positioning groove. The positioning cover plate is U-shaped and vertically connected to one side surface of the insulating gasket. The insulating gasket is connected to the positioning cover plate to form a accommodating groove that semi-encloses and covers the bending portion and the upper end portion of the static busbar.

[0012] As a preferred embodiment, the third positioning structure includes a third positioning groove arranged at the bottom of the insulating gasket, and a fourth positioning groove arranged on the other side of the insulating gasket, the arc-striking piece has an upper arc-striking portion matched and connected in the fourth positioning groove, and a lower arc-striking portion bent from the upper arc-striking portion and inserted into the third positioning groove, and the lower arc-striking portion is arranged close to the static contact.

[0013] As a preferred embodiment, the bending portion is formed with a vertical limit surface and a horizontal limit surface that are vertically connected on the side facing away from the base plate. The insulating pad is abutted against the vertical limit surface and is arranged higher than the static busbar. The lower arc-starting portion is in a hook shape and abuts against the horizontal limit surface, and its end is inserted into the second positioning groove.

[0014] As a preferred solution, the base plate is provided with a second fixing hole located above the static busbar, and the insulating pad and the arc-starting plate are respectively provided with second connecting holes opposite to the second fixing hole. The second screw structure passes through the second connecting hole and is fixed in the second fixing hole. After the second screw structure is fixed, the insulating pad and the arc-starting plate are kept fixedly connected to the base plate.

[0015] Compared with the prior art, the technical solution of the utility model has the following advantages:

[0016] 1. In the static contact installation structure of the universal circuit breaker provided by the utility model, the upper end of the static busbar is positioned and inserted into the busbar positioning hole of the base plate, so that the lower end thereof is clamped in the busbar positioning groove of the base plate through the positioning protrusion, thereby positioning and installing the static busbar on the base plate, and the installation position is accurate to prevent the static busbar from position displacement and shaking during the installation process, and finally the positioned static busbar and the base plate are fastened with a screw structure, thereby realizing the installation and fixation of the static contact. The installation structure of this static busbar is simple, and the positioning is more accurate, which is conducive to improving the installation efficiency. Such an installation design makes the consistency between multi-phase static contacts better, and can ensure the electrical performance of the product.

[0017] 2. In the static contact mounting structure of the universal circuit breaker provided by the utility model, a protruding portion protruding outward is formed on the outer wall of the base plate, and a recessed portion is formed on the inner side of the base plate corresponding to the protruding portion. This recessed portion design can reserve the installation space required for the sinking installation of the static busbar on the inner side of the base plate, so that the static busbar can be sunk to a certain depth and installed on the base plate, ensuring that there is sufficient opening distance between the moving and static contacts.

[0018] 3. In the static contact installation structure of the universal circuit breaker provided by the utility model, according to the bent structure design of the static contact bar, the spacing between the same-pole incoming and outgoing busbars can be increased, which is beneficial to reducing the temperature rise of the product. During installation, the upper end of the static busbar is positioned and inserted into the busbar positioning hole, and the lower end is positioned and connected with the busbar positioning groove through the positioning protrusion, and the bending part is matched and positioned and connected in the recessed part. The static busbar designed in this way realizes multiple positioning and connection functions with the base plate, and the positioning accuracy is higher. It is also convenient to fasten the positioned static busbar to the base plate through screws later. In this way, the accuracy and stability of the installation position of the static contacts of each phase can be guaranteed, and the installation is convenient and quick, which improves the installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the planar structure of the static contact installation structure provided by the present invention;

[0021] Figure 2 for Figure 1 The schematic diagram of the cross-sectional structure along line AA is shown;

[0022] Figure 3 for Figure 1 The schematic diagram of the cross-sectional structure along line BB is shown;

[0023] Figure 4 for Figure 1 The schematic diagram of the cross-sectional structure along the CC line is shown;

[0024] Figure 5 It is a three-dimensional structural schematic diagram of the static contact assembly of the present invention;

[0025] Figure 6 It is a schematic diagram of the split structure of the static contact assembly of the present invention;

[0026] Figure 7It is a schematic diagram of the split structure of the static contact assembly of the present invention in another direction;

[0027] Figure 8 A schematic diagram of the three-dimensional structure of the static contact installation structure provided by the present invention;

[0028] Explanation of the reference numerals in the accompanying drawings: 1. Base plate; 11. Busbar positioning hole; 12. Busbar positioning groove; 13. Second positioning groove; 14. Limiting boss; 15. Interphase groove; 16. Raised portion; 17. Recessed portion; 2. Static busbar; 20. Static contact; 21. Upper end portion; 22. Lower end portion; 23. Bending portion; 231. Vertical limiting surface; 232. Horizontal limiting surface; 24. Positioning protrusion; 3. Insulating gasket; 31. Positioning cover plate; 32. Third positioning groove; 33. Fourth positioning groove; 34. Isolation groove; 4. Arc-striking sheet; 41. Upper arc-striking portion; 42. Lower arc-striking portion; 5. First screw structure; 6. Second screw structure; 7. Moving busbar; 8. Moving contact assembly; 9. Arc extinguishing chamber device. DETAILED DESCRIPTION

[0029] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the description of the present invention, it should be noted that the terms "first", "second" and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 invention can be understood according to specific circumstances.

[0032] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] Example

[0034] The present embodiment is described in detail below with reference to the accompanying drawings:

[0035] This embodiment provides Figure 1-Figure 8A static contact installation structure is shown, comprising a static busbar 2, an insulating gasket 3, an arc-striking piece 4 and a static contact 20 arranged on the static busbar 2, which are sequentially connected and installed on a base plate 1. The insulating gasket 3 and the arc-striking piece 4 are connected to the static busbar 2. The static busbar 2 is a bent structure and a first positioning structure is arranged between the base plate 1 to maintain the relative position of the two. A second positioning structure is arranged between the static busbar 2 and the base plate 1 to form a positioning connection with the insulating gasket 3. The insulating gasket 3 is provided with a third positioning structure to form a positioning connection with the arc-striking piece 4. The insulating gasket 3 is semi-wrapped and covered on the static busbar 2 and is provided with The busbar positioning hole 11 is sealed, and the arc-starting piece 4 is tightly abutted against the static busbar 2 and arranged close to the static contact 20. Specifically, the first positioning structure includes a busbar positioning hole 11 and a busbar positioning groove 12 arranged on the base plate 1 at an interval up and down, and a positioning protrusion 24 arranged at one end of the static busbar 2 and plugged into the busbar positioning groove 12. One end of the static busbar 2 is inserted into the busbar positioning groove 12 through the positioning protrusion 24 to form a positioning fit, and the other end is positioned and inserted into the busbar positioning hole 11 and extends out of the base plate 1. The static busbar 2 and the base plate 1 are fixedly connected by the first screw structure 5 while maintaining the positioning fit.

[0036] In the above embodiment, the upper end 21 of the static busbar 2 is positioned and inserted into the busbar positioning hole 11 of the base plate 1, so that the lower end 22 is clamped in the busbar positioning groove 12 of the base plate through the positioning protrusion 24, thereby positioning and installing the static busbar 2 on the base plate. The installation position is accurate to prevent the static busbar from being displaced and shaking during the installation process. Finally, the positioned static busbar 2 is fastened to the base plate 1 with a screw structure, thereby realizing the installation and fixation of the static contact. The installation structure of this static busbar 2 is simple, and the positioning is more precise, which is conducive to improving the installation efficiency. Such an installation design makes the consistency between multi-phase static contacts better, and can ensure the electrical performance of the product.

[0037] In summary, during installation, the static busbar 2 is first positioned and installed on the base plate 1 through the first positioning structure, and then the insulating gasket 3 is positioned and installed on the static busbar 2 through the first positioning structure, so that the insulating gasket 3 covers the static busbar 2 and seals and blocks the busbar positioning hole 11, thereby improving the insulation performance of the product. Then, the arc-starting piece 4 is positioned and installed on the insulating gasket 3 through the third positioning structure, so that the arc-starting piece 4 is tightly abutted against the static busbar 2 and close to the static contact 20, which is beneficial to the arc starting effect on the static contact 20. In this way, the static busbar 2, the insulating gasket 3, and the arc-starting piece 4 are installed in sequence on the base plate 1, thereby fixing the static busbar 2. The insulating pad 3 and the arc-striking piece 4 play the role of pre-positioning installation. Finally, it is only necessary to fix the static busbar, the insulating pad, the arc-striking piece and the base plate through the fastening structure. The technical solution optimizes and improves the installation structure of the static contact. The static busbar 2, the insulating pad 3 and the arc-striking piece 4 are positioned and assembled one by one according to the installation sequence, and then fixed through the fastening structure. Compared with the prior art, the number of angle plates and screws used is reduced, the installation process is simplified, the installation is more convenient and quick, the assembly is highly accurate and reliable, and such installation improves the consistency and stability of the static contacts of each phase of the product, the overall structure is more compact, and the product quality and working performance are improved.

[0038] Combine the following Figure 1-Figure 5 The specific configuration of the static busbar 2 is described in detail:

[0039] The bottom plate 1 has a protrusion 16 formed on its outer wall protruding outward, and a recessed portion 17 formed on the inner side of the bottom plate 1 corresponding to the protrusion 16. The busbar positioning hole 11 and the busbar positioning groove 12 are respectively arranged on the upper and lower sides of the recessed portion 17, and the static busbar 2 is bent and extended to be connected to the recessed portion 17. This design of the recessed portion 17 can reserve the installation space required for sinking the static busbar 2 on the inner side of the bottom plate 1, so that the static busbar 2 can be installed on the bottom plate 1 by sinking a certain depth, ensuring that there is a sufficient opening distance between the moving and static contacts.

[0040] It is further preferred that the inner side of the bottom plate 1 is provided with a plurality of interphase grooves 15 suitable for accommodating the installation of the static busbar 2, the insulating liner 3, and the arc-starting sheet 4, as shown in FIG. Figure 8In each interphase groove 15, a moving busbar 7, an arc extinguishing chamber device 9, a moving contact assembly 8, and a stationary contact assembly consisting of a stationary busbar 2, an insulating liner 3, and an arc-starting piece 4 are installed. The moving busbar 7 is connected to the moving contact assembly 8 and is used for lower wiring. The recessed portion 17 is formed in each interphase groove 15. The stationary busbar 2 includes an upper end portion 21, a lower end portion 22, and a bent portion 23 that is bent and connected to the upper end portion 21 and the lower end portion 22 and accommodated in the interphase groove 15. The lower end portion 22 is provided with a static contact 20, the upper end portion 21 passes through the busbar positioning hole 11 for use in the upper incoming line of the static busbar 2, the bending portion 23 is respectively connected to the upper end portion 21 and the lower end portion 22 in a Z shape, and the corresponding cross-sectional shape of the recessed portion 17 is L-shaped, and a limiting boss 14 is formed on its lower side, and a busbar positioning groove 12 is provided at the end of the limiting boss 14, so that the bending portion 23 is matched and positioned and connected to the recessed portion 17. It can be seen from the above structure that according to the bent structural design of the static contact bar, the spacing between the same-pole input and output busbars can be increased, which is beneficial to reducing the temperature rise of the product. During installation, the upper end 21 of the static busbar 2 is positioned and inserted into the busbar positioning hole 11, and the lower end 22 is positioned and connected with the busbar positioning groove 12 through the positioning protrusion 24, and the bending portion 23 is matched and positioned and connected in the recessed portion 17. The static busbar 2 designed in this way can achieve multiple positioning and connection functions with the base plate 1, with higher positioning accuracy, and it is also convenient to subsequently fasten the positioned static busbar 2 to the base plate 1 by screws, so that the accuracy and stability of the installation position of the static contacts of each phase can be ensured, the installation is convenient and quick, and the installation efficiency is improved.

[0041] like Figure 1-Figure 2 As shown, the static busbar 2 needs to be fixed by a screw structure after positioning. Specifically, a first fixing hole is provided on the bottom plate 1, and a first connecting hole corresponding to the first fixing hole is provided on the bending portion 23 of the static busbar 2. The first screw structure 5 passes through the first connecting hole and is fixed in the first fixing hole to fix the static busbar 2 on the bottom plate 1. The advantage of such an installation design is that the upper end 21 of the static busbar 2 is positioned and inserted into the busbar positioning hole 11 of the bottom plate 1, and the lower end 22 thereof is clamped in the first positioning groove of the bottom plate 1 through the positioning protrusion 24, thereby achieving a positioning and installation effect for the static busbar 2 on the bottom plate 1, and the installation position is accurate to prevent the static busbar 2 from being offset during the installation process, and then it can be tightened with a tightening screw. The installation structure of this static busbar 2 is simple, the positioning is more accurate, and it is conducive to improving the installation efficiency. The consistency between the multi-phase static contacts installed in this way is relatively good, which can ensure the electrical performance of the product.

[0042] Combine the following Figure 2 , Figure 5-Figure 7 The specific setting method of the insulating pad is described in detail:

[0043] The insulating gasket 3 is installed on the static busbar 2 through a second positioning structure. Specifically, the second positioning structure includes a second positioning groove 13 formed between the static busbar 2 and the busbar positioning hole 11. The insulating gasket 3 has a positioning cover plate 31 that is matched and inserted into the second positioning groove 13, wherein the positioning cover plate 31 is U-shaped and vertically connected to one side of the insulating gasket 3. The insulating gasket 3 is connected to the positioning cover plate 31 to form an L-shaped isolation groove 34, and the isolation groove 34 semi-encloses and covers the bending portion 23 and the upper end portion 21 of the static busbar 2. Such installation enables the portion of the static busbar 2 covered by the insulating gasket to be insulated and separated from the arc-starting plate 4. This structural arrangement, through the cooperation of the positioning cover plate 31 and the second positioning groove 13, plays a role in positioning and installing the insulating gasket 3, and has good installation stability. At the same time, the positioning cover plate 31 can enhance the tightness of the connection between the static busbar 2 and the busbar positioning hole 11, so as to ensure the airtightness of the busbar positioning hole 11. Such installation enables the insulating gasket 3 to semi-enclose and cover the bending portion 23 and the upper end portion 21 of the static busbar 2, and seal and shield the busbar positioning hole 11, so as to play an insulating arc-isolating role, increase the creepage distance, and thus avoid the arc from burning the bending portion 23 and the upper end portion 21 of the static busbar 2, thereby having a good insulation protection effect and improving the insulation performance of the product.

[0044] Next, combine Figure 2 , Figure 5-Figure 7 The specific setting method of the arc-starting piece is described in detail:

[0045] The arc-striking piece 4 is installed between the insulating pad 3 and the static busbar 2 through the second positioning structure, wherein the third positioning structure includes a third positioning groove 32 arranged at the bottom of the insulating pad 3, and a fourth positioning groove 33 arranged on the other side of the insulating pad 3, the arc-striking piece 4 has an upper arc-striking portion 41 matched and connected to the fourth positioning groove 33, and a lower arc-striking portion 42 bent by the upper arc-striking portion 41 and inserted into the third positioning groove, the lower arc-striking portion 42 cooperates to abut against the bending portion 23 of the static busbar 2 and is located on the upper side of the static contact 20, as a specific According to the structural setting, the static busbar 2 is bent in a multi-step shape, and the side of the bent portion 23 facing away from the base plate 1 is formed with a vertical limit surface 231 and a horizontal limit surface 232 that are vertically connected. The insulating gasket is abutted against the vertical limit surface 231 and is arranged higher than the static busbar 2. The insulating gasket 3 installed in this way can completely cover the position of the busbar positioning hole 11, and make the lower arc-starting portion 42 in a hook shape abut against the horizontal limit surface 232 and be arranged close to the static contact 20. The horizontal limit surface 232 blocks the opening of the third positioning groove, which can limit the lower arc-starting portion 42 from escaping from the third positioning groove. This structural arrangement positions the lower arc-striking portion 42 of the arc-striking piece 4 in the third positioning groove, positions and connects the upper arc-striking portion 41 in the fourth positioning groove 33, and makes the lower arc-striking portion 42 abut and limit on the transverse limiting surface of the bending portion 23, thereby achieving the positioning and installation of the arc-striking piece 4. The advantage of such a design is that the arc-striking piece 4 is reliably positioned and connected between the insulating pad 3 and the static busbar 2 through the third positioning structure. After installation, the lower arc-striking portion 42 of the arc-striking piece 4 is in contact with the bending portion 23 of the static busbar 2, thereby ensuring a tighter connection between the arc-striking piece and the static busbar. Since the lower arc-striking portion 42 is arranged close to the static contact, the arc on the static contact can be quickly guided into the arc extinguishing chamber through the arc-striking piece 4, which is beneficial to improving the arc extinguishing effect when the circuit breaker is disconnected.

[0046] like Figure 5 As shown, the lower arc-striking portion 42 includes a flat sheet and an inclined sheet connected to form an acute angle, the inclined sheet is connected to the upper arc-striking portion 41, and the flat sheet is fitted on the transverse limiting surface 232, and its end is inserted into the third positioning groove 32. This hook-shaped arc-striking sheet can not only form a good positioning match with the third positioning groove and the fourth positioning groove to achieve the effect of positioning installation, but also is more conducive to attracting the arc on the static contact, playing a role of rapid arc striking, and improving the arc extinguishing performance of the circuit breaker.

[0047] In this embodiment, the arc-starting sheet 4 and the insulating liner 3 are fixedly connected to the base plate 1 through the second screw structure 6 after completing their respective positioning. Figure 1 and Figure 5, the base plate 1 is provided with a second fixing hole located above the static busbar 2, the insulating gasket 3 and the arc-starting sheet 4 are respectively provided with second connecting holes corresponding to the second fixing hole, the second screw structure 6 is fixed in the second fixing hole after passing through the second connecting hole, and the second screw structure 6 is fixed to keep the insulating gasket 3 and the arc-starting sheet 4 fixedly connected to the base plate 1, so that the arc-starting sheet 4 and the insulating gasket in the positioning state are synchronously fixed on the base plate 1, and the installation stability is good, the first fixing hole and the second fixing hole are respectively screw hole structures, or nuts that match the screw structure are embedded in the first fixing hole and the second fixing hole. It can be seen from the above that in this embodiment, a group of screw structures are used after the static busbar 2 is positioned and installed, and another group of screw structures are used after the insulating gasket 3 and the arc-starting sheet 4 are positioned and installed. Compared with the prior art, the entire installation process reduces the number of screws used, the installation process is simple, the assembly accuracy is high, the installation efficiency is improved, and the production cost is reduced.

[0048] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled 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 list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A static contact mounting structure for a universal circuit breaker, comprising a static busbar (2) mounted on a base plate (1) and a static contact (20) arranged on the static busbar (2), wherein the static busbar (2) is in a bent structure and a first positioning structure is arranged between the static busbar (2) and the base plate (1) to maintain the relative position of the two, characterized in that: The first positioning structure comprises a busbar positioning hole (11) and a busbar positioning groove (12) arranged on the bottom plate (1) at intervals from top to bottom, and a positioning protrusion (24) arranged at one end of the static busbar (2) and plugged into the busbar positioning groove (12); one end of the static busbar (2) is inserted into the busbar positioning groove (12) through the positioning protrusion (24) to form a positioning fit, and the other end is positioned and inserted into the busbar positioning hole (11) and extends out of the bottom plate (1); the static busbar (2) and the bottom plate (1) are fixedly connected by a first screw structure (5) under the positioning fit.

2. The static contact mounting structure of the universal circuit breaker according to claim 1, characterized in that: The base plate (1) has a protruding portion (16) formed on its outer wall and protruding outward, and a recessed portion (17) formed on the inner side of the base plate (1) corresponding to the protruding portion (16); the busbar positioning hole (11) and the busbar positioning groove (12) are respectively arranged on the upper and lower sides of the recessed portion (17); and the static busbar (2) is bent and extended to be connected to the recessed portion (17).

3. The static contact mounting structure of the universal circuit breaker according to claim 2, characterized in that: The static busbar (2) comprises an upper end portion (21) inserted into the busbar positioning hole (11), a lower end portion (22) provided with the positioning protrusion (24), and a bending portion (23) bending and connecting the upper end portion (21) and the lower end portion (22), wherein the bending portion (23) is respectively connected to the upper end portion (21) and the lower end portion (22) in a Z shape.

4. The static contact mounting structure of the universal circuit breaker according to claim 3, characterized in that: The cross-sectional shape of the recessed portion (17) is L-shaped, and a limiting boss (14) is formed on its lower side. The end of the limiting boss (14) is provided with a busbar positioning groove (12), and the bent portion (23) is matched and positioned and connected in the recessed portion (17).

5. The static contact mounting structure of the universal circuit breaker according to claim 1, characterized in that: The base plate (1) is provided with a first fixing hole, and the bent portion (23) of the static busbar (2) is provided with a first connecting hole corresponding to the first fixing hole. The screw structure passes through the first connecting hole and is fixed in the first fixing hole to fix the static busbar (2) on the base plate (1).

6. The static contact mounting structure of the universal circuit breaker according to any one of claims 1 to 5, characterized in that: It also includes an insulating gasket (3) and an arc-striking piece (4) arranged on the static busbar (2); a second positioning structure is arranged between the static busbar (2) and the base plate (1) to form a positioning match with the insulating gasket (3); a third positioning structure is arranged on the insulating gasket (3) to form a positioning match with the arc-striking piece (4); the insulating gasket (3) is half-wrapped on the static busbar (2) and cooperates with the sealing busbar positioning hole (11); the insulating gasket (3) and the arc-striking piece (4) are fixedly connected to the base plate (1) by a second screw structure (6) in the positioning state.

7. The static contact mounting structure of the universal circuit breaker according to claim 6, characterized in that: The second positioning structure comprises a second positioning groove (13) formed between the static busbar (2) and the busbar positioning hole (11); the insulating gasket (3) has a positioning cover plate (31) matched and inserted into the second positioning groove (13); the positioning cover plate (31) is in a U-shaped structure and is vertically connected to one side of the insulating gasket (3); the insulating gasket (3) is connected to the positioning cover plate (31) to form a receiving groove, and the receiving groove semi-encloses and covers between the bending portion (23) and the upper end portion (21) of the static busbar (2).

8. The static contact mounting structure of the universal circuit breaker according to claim 7, characterized in that: The third positioning structure comprises a third positioning groove (32) arranged at the bottom of the insulating gasket (3), and a fourth positioning groove (33) arranged on the other side of the insulating gasket (3); the arc-striking piece (4) comprises an upper arc-striking portion (41) matched and connected in the fourth positioning groove (33), and a lower arc-striking portion (42) bent from the upper arc-striking portion (41) and inserted into the third positioning groove; the lower arc-striking portion (42) is arranged close to the static contact (20).

9. The static contact mounting structure of the universal circuit breaker according to claim 8, characterized in that: A vertical limiting surface (231) and a horizontal limiting surface (232) which are vertically connected are formed on the side of the bending portion (23) facing away from the bottom plate (1); the insulating pad is abutted against the vertical limiting surface (231) and is arranged higher than the static busbar (2); the lower arc-starting portion (42) is in a hook shape and abuts against the horizontal limiting surface (232), and its end is inserted into the second positioning groove (13).

10. The static contact mounting structure of the universal circuit breaker according to claim 6, characterized in that: The base plate (1) is provided with a second fixing hole located above the static busbar (2); the insulating gasket (3) and the arc-starting plate (4) are respectively provided with second connecting holes corresponding to the second fixing holes; the second screw structure (6) passes through the second connecting hole and is fixed in the second fixing hole; after the second screw structure (6) is fixed, the insulating gasket (3) and the arc-starting plate (4) are kept fixedly connected to the base plate (1).

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