An air switch with overvoltage protection

Abstract

This utility model discloses an air switch with overvoltage protection, including an air switch body. A live wire, a ground wire, and a neutral wire are connected to the air switch body. One end of the air switch body has a mounting box with a mounting cover. The live wire is connected inside the mounting box. Two sets of mounting rods are symmetrically arranged inside the mounting box, connected by a copper sheet. One end of the copper sheet has a reset component, and the other end has a pressing component. This utility model achieves efficient overvoltage protection through an innovative dual-airbag linkage design. When the circuit temperature rises abnormally due to overload or short circuit, the heat-conducting plate quickly transfers heat to the second airbag. The inert nitrogen gas inside the second airbag expands upon heating, transmitting pressure to the first airbag through a connecting pipe. The expansion of the first airbag pushes the copper sheet from the conductive copper rod to the insulating plastic rod, thereby physically cutting off the circuit connection.

Description

Technical Field

[0001] This utility model relates to the field of air switch technology, specifically an air switch with overvoltage protection. Background Technology

[0002] In utility model patent application CN217214614U, published on August 16, 2022, entitled "Air Switch and Air Switch Assembly," this utility model discloses an air switch and an air switch assembly, belonging to the field of control switch technology. The key technical points of the solution are: the air switch and air switch assembly include a housing with a wire outlet hole; a circuit board installed inside the housing; multiple connecting wires, one end of each wire connected to the circuit board, and the other end passing through the wire outlet hole and exiting the housing; and a connector electrically connected to the multiple connecting wires to enable communication between the circuit board and external connectors. The air switch provided in this application only requires mating with external electrical equipment or other air switch connectors via the connector, solving the problem of wiring errors caused by wiring wires one by one and effectively improving assembly efficiency.

[0003] In the aforementioned patents or prior art, air circuit breakers may experience abnormal voltage increases during daily use due to power grid fluctuations, lightning strikes, equipment malfunctions, or human error. When the air circuit breaker is over-voltaged, it may cause the circuit to overheat, the insulation to be damaged, or even cause a short circuit and fire. Utility Model Content

[0004] The purpose of this invention is to provide an air switch with overvoltage protection to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an air switch with overvoltage protection, comprising an air switch body, on which a live wire, a ground wire, and a neutral wire are respectively connected. One end of the air switch body is provided with a mounting box, and a mounting cover is installed on the mounting box. The live wire is connected inside the mounting box. Two sets of mounting rods are symmetrically arranged inside the mounting box, and the two sets of mounting rods are connected by a copper sheet. One end of the copper sheet is provided with a reset component, and the other end is provided with a pressing component. The pressing component includes a first air bladder located on one side of the copper sheet. A heat-conducting sheet is installed inside the air switch body, and a second air bladder is provided on the heat-conducting sheet. The first air bladder and the second air bladder are connected by a connecting pipe.

[0006] Furthermore, the ends of the two sets of mounting rods are threadedly connected to the inner wall of the mounting box.

[0007] Furthermore, the mounting rod is composed of two sections: a copper rod and a plastic rod, with the copper rod located near the threaded end.

[0008] Furthermore, the air switch body has an opening near the mounting box that matches the connecting pipe, and the connecting pipe passes through the opening on the air switch body to connect with the second airbag.

[0009] Furthermore, the reset assembly includes a spring disposed on the copper sheet near the mounting cover.

[0010] Furthermore, the mounting cover is provided with a limiting ring that cooperates with the spring.

[0011] Compared with the prior art, the beneficial effects of this utility model are: the air switch with overvoltage protection is reasonable and has the following advantages:

[0012] (1) The air switch achieves efficient overvoltage protection through innovative dual-airbag linkage design. When the circuit temperature rises abnormally due to overload or short circuit, the heat-conducting plate will quickly transfer heat to the second airbag. The inert nitrogen gas filled inside expands when heated and transmits pressure to the first airbag through the connecting pipe. The expansion of the first airbag will push the copper sheet from the conductive copper rod to the insulating plastic rod, thereby physically cutting off the circuit connection. This process is driven entirely by thermodynamic principles and does not rely on electronic sensors or external power supply. It has a faster response speed and higher reliability. Traditional air switches usually rely on the thermal deformation of the bimetallic strip to trip, but this design achieves more precise force transmission through pneumatic transmission, avoiding mechanical jamming. In addition, the chemical inertness of nitrogen makes it stable at high temperatures. Even if the air switch spontaneously combusts inside, the leaked nitrogen gas can still play a flame-retardant role, further improving safety. Compared with the traditional solution, this design integrates overvoltage protection and fire prevention function, significantly reducing the risk of electrical fire.

[0013] (2) The mounting box of this air switch adopts a modular design. The installation and maintenance process of the live wire is significantly simplified by the threaded mounting rod and the detachable mounting cover. During installation, only the mounting rod needs to be tightened to fix the circuit by utilizing the conductivity of the copper rod. The return spring design of the copper plate ensures stable initial contact. If maintenance is required, the internal components can be operated directly by simply opening the mounting cover without disassembling the entire switch. The two-section mounting rod, that is, the combination of copper rod and plastic rod, not only achieves precise zoning of conductive and insulating areas, but also avoids the maintenance difficulties caused by traditional welding through the threaded connection. This design significantly reduces maintenance costs and is especially suitable for industrial scenarios that require frequent circuit adjustments. At the same time, it avoids the problem of traditional integrated switches being scrapped due to partial damage. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0015] Figure 2This is a three-dimensional structural diagram of the mounting box of this utility model;

[0016] Figure 3 This is a schematic diagram of the planar structure of this utility model;

[0017] Figure 4 This is a three-dimensional structural diagram of the mounting cover of this utility model;

[0018] Figure 5 This is a schematic diagram of the extrusion assembly of this utility model.

[0019] In the diagram: 100, air switch body; 101, live wire; 102, ground wire; 103, neutral wire; 200, mounting box; 201, mounting cover; 202, mounting rod; 2020, copper rod; 2021, plastic rod; 203, copper sheet; 204, first air chamber; 205, connecting pipe; 206, second air chamber; 207, heat-conducting plate; 208, spring; 209, limit ring. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-5 The present invention provides a technical solution as follows:

[0022] Example 1:

[0023] An air switch with overvoltage protection includes an air switch body 100, on which a live wire 101, a ground wire 102, and a neutral wire 103 are respectively connected. One end of the air switch body 100 is provided with a mounting box 200, on which a mounting cover 201 is installed. The live wire 101 is connected inside the mounting box 200. Two sets of mounting rods 202 are symmetrically arranged inside the mounting box 200, and the two sets of mounting rods 202 are connected by a copper sheet 203. One end of the copper sheet 203 is provided with a reset component, and the other end is provided with a compression component. The compression component includes a first airbag 204 located on one side of the copper sheet 203. A heat-conducting plate 207 is installed inside the air switch body 100, and a second airbag 206 is provided on the heat-conducting plate 207. The first airbag 204 and the second airbag 206 are connected by a connecting pipe 205.

[0024] The ends of the two sets of mounting rods 202 are threaded to the inner wall of the mounting box 200.

[0025] The mounting rod 202 is composed of two sections, namely a copper rod 2020 and a plastic rod 2021, with the copper rod 2020 located near the threaded end.

[0026] The air switch body 100 has an opening at one end near the mounting box 200 that mates with the connecting pipe 205, and the connecting pipe 205 passes through the opening on the air switch body 100 and connects to the second airbag 206.

[0027] The reset assembly includes a spring 208 disposed on the copper sheet 203 near the mounting cover 201.

[0028] The mounting cover 201 is provided with a limiting ring 209 that cooperates with the spring 208.

[0029] Working principle: In use, the live wire 101 is connected to the mounting box 200, and the bottom of the mounting box 200 is also connected to the live wire 101. By removing the mounting cover 201, the mounting rod 202 is rotated. As the mounting rod 202 rotates, the thread at its end engages with the threaded groove on the inner wall of the mounting box 200, thus securing the live wire 101. The threaded part on the mounting rod 202 is the same as that on the copper rod 2020, both being made of conductive copper. The two sets of mounting rods 202 are connected by a copper sheet 203, thereby transmitting current to the lower mounting rod 202 and achieving circuit continuity. The mounting cover 201 is then installed on the mounting box 200. At this time, the limiting ring 209 at the end of the inner wall of the mounting cover 201 engages with the spring 208, and the spring 208 is located within the limiting ring 209. The copper sheet 203 is always positioned at the copper rod 2020 due to compression. When the internal temperature of the air switch body 100 increases, the heat-conducting plate 207 transfers heat to the second airbag 206, causing the nitrogen gas inside the second airbag 206 to expand due to heat. Nitrogen is an inert gas and is not easily combustible. As the second airbag 206 expands, it transfers the nitrogen gas inside through the connecting pipe 205 to the first airbag 204. The first airbag 204 expands and presses against the copper sheet 203, causing the copper sheet 203 to move away from the copper rod 2020 and slide to the plastic rod 2021. Since the plastic rod 2021 is made of plastic, which is non-conductive, the circuit is no longer connected and cannot conduct electricity. Furthermore, when the air switch body 100 spontaneously combusts, the nitrogen gas leaking from the second airbag 206 can retard the flame.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An air switch with overvoltage protection comprising an air switch body (100), characterized in that: The air switch body (100) is connected to a live wire (101), a ground wire (102), and a neutral wire (103). One end of the air switch body (100) is provided with a mounting box (200). The mounting box (200) is provided with a mounting cover (201). The live wire (101) is connected to the mounting box (200). Two sets of mounting rods (202) are symmetrically arranged inside the mounting box (200). The two sets of mounting rods (202) are connected by a copper sheet (203). One end of the copper sheet (203) is provided with a reset component, and the other end is provided with a pressing component. The pressing component includes a first airbag (204) located on one side of the copper sheet (203). A heat-conducting plate (207) is installed inside the air switch body (100). A second airbag (206) is provided on the heat-conducting plate (207). The first airbag (204) and the second airbag (206) are connected by a connecting pipe (205).

2. An air switch with overvoltage protection according to claim 1, characterized in that: The ends of the two sets of mounting rods (202) are threaded to the inner wall of the mounting box (200).

3. An air switch with overvoltage protection according to claim 2, characterized in that: The mounting rod (202) is composed of two sections, namely a copper rod (2020) and a plastic rod (2021), with the copper rod (2020) located near the threaded end.

4. An air switch with overvoltage protection according to claim 1, characterized in that: The air switch body (100) has an opening at one end near the mounting box (200) that matches the connecting pipe (205), and the connecting pipe (205) passes through the opening on the air switch body (100) and connects to the second airbag (206).

5. An air switch with overvoltage protection according to claim 1, characterized in that: The reset assembly includes a spring (208) disposed on the copper sheet (203) near the mounting cover (201).

6. An air switch having overvoltage protection according to claim 5, wherein: The mounting cover (201) is provided with a limiting ring (209) that cooperates with the spring (208).

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