Combination switch with large-current protection function

Abstract

A combined switch with a large current protection function comprises at least two-pole frame type switches and at least one-pole fuses, and the at least two-pole frame type switches and the at least one-pole fuses are combined into a whole to be installed in a direct-current power system to control on-off of the direct-current power system. According to the combined switch, the frame-type switch and the fuse are combined into a whole, the size of the whole occupied space of the switch is reduced, the application range of the switch is expanded, meanwhile, the use amount of connecting copper bars between the frame-type switch and the fuse is reduced, the product cost is saved, fusing indication of the fuse can be integrated to a secondary terminal of the frame-type switch, and the service life of the switch is prolonged. The wiring is convenient, and the wiring difficulty is reduced; on the other hand, the frame-type switch and the fuse are combined into a whole, the current protection matching degree is improved, large electric quantity overload protection of the direct-current power system is achieved, additional model selection and construction are not needed, the fuse can be disassembled, assembled and maintained from the front face, and the maintenance difficulty is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of low-voltage electrical technology, specifically relating to a combination switch with high current protection function. Background Technology

[0002] The term "switch" is defined as turning on and off. It refers to a component that can open a circuit, interrupt current, or divert current to another circuit. The most common switches are manually operated electromechanical devices with one or more contacts. A "closed" contact indicates that the contact is conductive, allowing current to flow; an "open" switch indicates that the contact is not conductive, forming an open circuit and preventing current from flowing. The history of switches has evolved from the primitive, manually operated knife switches to the intelligent switches used in various large-scale electrical control equipment today. Switches have become increasingly functional and safer.

[0003] With the development of DC power systems such as photovoltaics, energy storage, rail transit, and data centers, the application of switches in DC systems has become increasingly widespread. To improve the operating voltage and breaking capacity of switches in DC power systems, current technologies typically combine existing frame-type switches and fuses commonly used in AC power systems to control the switching function of DC power systems. However, while this method of combining frame-type switches and fuses to control the switching function of DC power systems can improve the operating voltage and breaking capacity of switches, it has the following drawbacks:

[0004] (1) The existing combination of frame-type switches and fuses adopts a 4-pole frame-type switch and a 2-pole fuse, which occupies a large space and cannot be used in narrow space scenarios.

[0005] (2) The existing combined wiring of frame switches and fuses is relatively complicated, requires more materials, and increases product costs;

[0006] (3) In the prior art, frame switches and fuses need to be purchased separately, which requires compatibility between frame switches and fuses, increasing the difficulty of selection and also increasing the installation and use costs.

[0007] (4) The existing combination of frame-type switches and fuses is a 4-pole frame-type switch and a 2-pole fuse, which makes it difficult to inspect from the front and increases the difficulty of replacement and maintenance.

[0008] (5) For most applications, existing frame switches and fuses do not need to consider the situation when a small fault current flows through them. Utility Model Content

[0009] The purpose of this invention is to address the shortcomings of the existing combined use of frame switches and fuses in DC power systems by providing a combined switch with high current protection function. This combines the frame switch and fuse into a single unit, effectively solving the defects of the existing combined use of frame switches and fuses, and ensuring the operating voltage and breaking capacity of the switch in the DC power system.

[0010] Technical solution

[0011] To achieve the above objectives, this utility model provides a combination switch with high current protection function, characterized in that: it includes at least a 2-pole frame switch and at least a 1-pole fuse, the at least 2-pole frame switch and at least a 1-pole fuse are combined into a whole and installed in a DC power system to control the on and off of the DC power system. When a large short-circuit current flows through the DC power system, the at least 1-pole fuse will automatically disconnect the circuit to protect the entire DC power system.

[0012] The at least two-pole frame switch (1) does not include an arc-extinguishing chamber.

[0013] In one embodiment, the at least one-pole fuse is integrated with the at least two-pole frame switch as a single unit or assembled into a whole.

[0014] In one embodiment, the at least one-pole fuse is mounted on the left or right side or both sides of the at least two-pole frame switch.

[0015] In one embodiment, the at least one-pole fuse is assembled on the left or right side or both sides of the at least two-pole frame switch assembly via screw connection or snap-fit ​​structure.

[0016] In one embodiment, the at least one-pole fuse and the at least two-pole frame switch are mounted as a single unit on the assembly base plate.

[0017] In one embodiment, the at least one-pole fuse is provided with a fuse indication device, which is connected to the secondary terminals of the at least two-pole frame switch via a wire.

[0018] In one embodiment, the terminal blocks of the at least 2-pole frame switch and the corresponding terminal blocks of the at least 1-pole fuse are connected so that the combination of the at least 2-pole frame switch and the at least 1-pole fuse forms several outgoing wiring methods.

[0019] In one embodiment, the at least one-pole fuse is mounted on the rear side of the at least two-pole frame switch, above or below the corresponding terminal block of the at least two-pole frame switch.

[0020] In one embodiment, the at least one-pole fuse is mounted between the at least two-pole frame switches.

[0021] Beneficial effects

[0022] This utility model provides a combination switch with high current protection function, comprising at least a 2-pole frame switch and at least a 1-pole fuse. The at least 2-pole frame switch and at least a 1-pole fuse are combined into a whole and installed in a DC power system to control the on / off state of the DC power system. When a large current flows through the DC power system, and the current exceeds a specified value, the circuit is disconnected by the at least 1-pole fuse, thereby protecting the entire DC power system. This combination switch reduces the overall space occupied by the frame switch and fuse by integrating them into a single unit, expanding the switch's applicable scenarios. Simultaneously, it reduces the amount of connecting copper busbars between the frame switch and fuse, saving product costs. The fuse's blown indicator can be integrated into the secondary terminals of the frame switch, facilitating wiring and reducing wiring difficulty. Furthermore, the integration of the frame switch and fuse into a single unit improves the current protection matching degree, achieving protection across the entire current range of the DC power system without requiring separate selection and construction, reducing installation difficulty. Additionally, the fuse can be disassembled and repaired from the front, reducing maintenance difficulty. Without considering the case of small current flowing through the DC power system, at least the two-pole frame switch does not contain an arc-extinguishing chamber. Without an arc-extinguishing chamber, it does not have breaking capacity. The frame switch fuse composed of this overall system can only break the large short-circuit current by the fuse. The frame switch body provides an isolation break and has functions such as current carrying and short-time withstand, which reduces production costs and expands the application scope of the corresponding product of this application. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Appendix Figure 1 This is a product drawing from Embodiment 1 of this utility model;

[0025] Appendix Figure 2 This is a schematic diagram showing the separation of the fuse and the frame switch in Embodiment 1 of this utility model;

[0026] Appendix Figure 3 This is a front view of the fuse and frame switch after separation in Embodiment 1 of this utility model;

[0027] Appendix Figure 4 It is attached Figure 3 A-direction view;

[0028] Appendix Figure 5 This is a schematic diagram of the installation and connection of the fuse signal acquisition device in Embodiment 1 of this utility model;

[0029] Appendix Figure 6 This is a schematic diagram of the back of the fuse and frame switch after separation in Embodiment 1 of this utility model;

[0030] Appendix Figure 7 This is a right-side schematic diagram of the fuse and frame switch after separation in Embodiment 1 of this utility model;

[0031] Appendix Figure 8 This is the product with the assembled base plate in Embodiment 2 of this utility model. Figure 1 ;

[0032] Appendix Figure 9 This is the product with the assembled base plate in Embodiment 2 of this utility model. Figure 2 ;

[0033] Appendix Figure 10 This is the product with the assembled base plate in Embodiment 2 of this utility model. Figure 3 ;

[0034] Appendix Figure 11 This is the product in Embodiment 3 of this utility model. Figure 1 ;

[0035] Appendix Figure 12 This is the product in Embodiment 3 of this utility model. Figure 2 ;

[0036] Appendix Figure 13 This is the product in Embodiment 3 of this utility model. Figure 3 ;

[0037] Appendix Figure 14 This is a front view of the product in Embodiment 3 of this utility model;

[0038] Appendix Figure 15 This is the product in embodiment 4 of this utility model. Figure 1 ;

[0039] Appendix Figure 16 This is the product in Embodiment 4 of this utility model. Figure 2 ;

[0040] Appendix Figure 17 This is the product in embodiment 4 of this utility model. Figure 3 ;

[0041] Appendix Figure 18 This is a front view of the product in Embodiment 4 of this utility model;

[0042] Appendix Figure 19 These are the front view, top view, perspective view, and CC sectional view of Embodiment 5 of this utility model. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0048] Example 1

[0049] In existing technologies, frame-type switches and fuses commonly used in AC power systems are combined to control the switching function of DC power systems. However, this switching control method is bulky, difficult to replace, costly, and complex to select, resulting in many drawbacks in practical applications. To solve these problems, as shown in the appendix... Figure 1 As shown, this embodiment provides a combination switch with high current protection function, which includes at least a 2-pole frame switch 1 and at least a 1-pole fuse 2, as shown in the attached figure. Figure 2 As shown, the at least two-pole frame switch 1 and the at least one-pole fuse 2 are combined into a whole and installed in the DC power system to control the on and off of the DC power system. When a large short-circuit current flows through the DC power system, the at least one-pole fuse 2 will automatically disconnect the circuit to protect the entire DC power system.

[0050] Specifically, it means: as attached Figure 1 As shown, the at least one-pole fuse 2 is installed on the left or right side, or both sides, of the at least two-pole frame switch 1. The at least one-pole fuse 2 and the at least two-pole frame switch 1 are integrated together as a single unit or assembled into a whole. (See attached diagram) Figures 1-6 As shown, in this example, the fuse 2 is 2-pole, the frame switch is 2-pole, and the fuse 2 is installed on the left and right sides of the 2-pole frame switch 1. By combining the frame switch and the fuse into a whole, the overall space occupied by the switch is reduced, the applicable scenarios of the switch are expanded, and protection of the entire current range of the DC power system is achieved without the need for additional selection and construction, thus reducing the installation difficulty. Furthermore, the at least 1-pole fuse 2 is assembled on the left or right side or both sides of the at least 2-pole frame switch 1 by screw connection or snap-fit ​​structure. In this embodiment, the at least 1-pole fuse 2 is assembled on the left and right sides of the at least 2-pole frame switch 1 by screw 4. The frame switch and the fuse are assembled by screws, which simplifies the wiring, reduces the amount of connecting copper busbars, and saves product costs; in this embodiment, as shown in the attached... Figure 5As shown, the at least one-pole fuse 2 is equipped with a fuse-breaking indicator 2a, which is connected to the secondary terminals of the at least two-pole frame switch 1 via a wire. When the fuse blows, the fuse status is displayed through electrical signal transmission.

[0051] As attached Figure 1 As shown in Figures 4 and 6, the terminal blocks of the at least two-pole frame switch 1 and the corresponding terminal blocks of the at least one-pole fuse 2 are connected to form several wiring configurations for the combined unit of the at least two-pole frame switch 1 and the at least one-pole fuse 2. By connecting the different terminal blocks of the frame switch 1 and the fuse 2 through corresponding connecting blocks, it is possible to achieve wiring configurations where the combined switch is wired at the top, at the bottom, or a combination of both, thereby facilitating maintenance.

[0052] It should be noted that the at least two-pole frame switch 1 can be replaced with a circuit breaker, and the circuit breaker and fuse can be combined into a switch, which can also achieve the function of controlling the on and off of the DC power system as described in this embodiment.

[0053] Example 2

[0054] The at least one-pole fuse 2 and the at least two-pole frame switch 1 are mounted as shown in the attached... Figure 8 As shown in Figures 9 and 10, the assembly base plate 5 is integrally formed. Specifically, the at least two-pole frame switch 1 is mounted in the middle of the assembly base plate 5, and the at least one-pole fuse 2 is mounted in the corresponding cavity on the assembly base plate 5 to form a whole. Other structures are the same as in Embodiment 1. This embodiment adopts the method of mounting the frame switch and fuse on the assembly base plate, which further simplifies the installation and maintenance difficulty.

[0055] Example 3

[0056] In this embodiment, as shown in the appendix Figure 11 As shown in 12, 13, and 1,4, the at least one-pole fuse 2 is mounted on the rear side of the at least two-pole frame switch 1, above the corresponding terminal block 3 of the at least two-pole frame switch 1. Other structures are the same as in Embodiment 1. This structure further reduces the space occupied by the combination switch in the left-right direction, making it suitable for scenarios with ample installation space in the front-back direction.

[0057] Example 4

[0058] In this embodiment, as shown in the appendix Figure 15 As shown in Figures 16, 17, and 18, the at least one-pole fuse 2 is mounted on the rear side of the at least two-pole frame switch 1, located below the corresponding terminal block 3 of the at least two-pole frame switch 1. Other structures are the same as in Embodiment 1. This structure further reduces the space occupied by the combination switch in the left-right direction, making it suitable for scenarios with ample installation space in the front-back direction.

[0059] Example 5

[0060] The at least one-pole fuse 2 is installed between the at least two-pole frame switch 1. Other structures are the same as in Embodiment 1, and this structure achieves the same effect as Embodiment 1, further optimizing the spatial layout.

[0061] Example 6

[0062] In this embodiment, at least the two-pole frame switch 1 does not include an arc-extinguishing chamber. Other embodiments 1 to 5 do not provide cross-sectional views, but refer to embodiment 6 internally. None of them include an arc-extinguishing chamber or an arc-extinguishing grid. In many actual application scenarios, it is not necessary to consider the case of small current flow (generally referring to overload current and critical current). Without considering the case of small current flow in DC power systems, at least the two-pole frame switch does not include an arc-extinguishing chamber. Without an arc-extinguishing chamber, it does not have breaking capacity. The frame switch fuse composed of this overall system can only break the short-circuit large current by the fuse. The frame switch body provides an isolation break and has functions such as current carrying and short-time withstand, which reduces production costs and expands the application scope of the corresponding product of this application.

[0063] This utility model provides a combination switch with high current protection function. By combining the frame switch and fuse into a whole, the overall size of the switch is reduced, expanding the applicable scenarios of the switch. At the same time, the amount of connecting copper busbars between the frame switch and the fuse is reduced, saving product costs. The fuse blowout indicator can be integrated into the secondary terminal of the frame switch, which is convenient for wiring and reduces wiring difficulty. On the other hand, the combination of the frame switch and fuse into a whole improves the current protection matching degree, realizes the protection of the entire current range of DC power system, eliminates the need for separate selection and construction, reduces installation difficulty, and the fuse can be disassembled and repaired from the front, reducing maintenance difficulty.

[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A combination switch with high current protection function, characterized in that... It includes at least a 2-pole frame switch (1) and at least a 1-pole fuse (2), which are combined into a whole and installed in the DC power system to control the on and off of the DC power system. When a large short-circuit current flows through the DC power system, the at least 1-pole fuse (2) will automatically disconnect the circuit to protect the entire DC power system. The at least two-pole frame switch (1) does not include an arc-extinguishing chamber.

2. A combination switch with high current protection function as described in claim 1, characterized in that... The at least one-pole fuse (2) and the at least two-pole frame switch (1) are assembled together as a whole or assembled into a single unit.

3. A combination switch with high current protection function as described in claim 2, characterized in that... The at least one-pole fuse (2) is installed on the left or right side or both sides of the at least two-pole frame switch (1).

4. A combination switch with high current protection function as described in claim 3, characterized in that... The at least one-pole fuse (2) is assembled on the left or right side or both sides of the at least two-pole frame switch (1) by screw connection or snap-fit ​​structure.

5. A combination switch with high current protection function as described in claim 3, characterized in that... The at least one-pole fuse (2) and the at least two-pole frame switch (1) are mounted on the assembly base plate (5) to form a whole.

6. A combination switch with high current protection function as described in claim 1, characterized in that... The at least one-pole fuse (2) is provided with a fuse indication device (2a), which is connected to the secondary terminal of the at least two-pole frame switch (1) via a wire.

7. A combination switch with high current protection function as described in claim 1, characterized in that... The terminal blocks of the at least two-pole frame switch (1) and the corresponding terminal blocks of the at least one-pole fuse (2) are connected to form a plurality of outgoing line modes in the whole assembly of the at least two-pole frame switch (1) and the at least one-pole fuse (2).

8. A combination switch with high current protection function as described in claim 1, characterized in that... The at least one-pole fuse (2) is mounted on the rear side of the at least two-pole frame switch (1) above or below the corresponding terminal block of the at least two-pole frame switch (1).

9. A combination switch with high current protection function as described in claim 1, characterized in that... The at least one-pole fuse (2) is installed between the at least two-pole frame switches (1).

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