阅读说明：本技术 一种用于物理直流双臂电桥中的开关装置 (Switching device for physical direct-current double-arm bridge ) 是由 吴永 于 2021-06-22 设计创作，主要内容包括：本发明提出的一种用于物理直流双臂电桥中的开关装置,包括壳体和电路板,电路板安装在壳体内,直流双臂电桥电路设置在电路板上；电路板上还设有串联在直流双臂电桥电路上的开关,壳体内部设有用于控制开关开合的弹簧件,弹簧件自然状态下,开关断开；弹簧件形变状态下,开关闭合。本发明提出的一种用于物理直流双臂电桥中的开关装置,通过按钮和弹簧件的设置,使得该开关装置在接线柱接线状态下,只有操作员一直维持按钮按下的状态,直流双臂电桥电路才能保持在上电状态进行工作,一旦操作员松开按钮,则开关在弹簧件的反弹力作用下恢复到断开状态,从而断开开关,使得直流双臂电桥电路断电。(The invention provides a switching device for a physical direct-current double-arm bridge, which comprises a shell and a circuit board, wherein the circuit board is arranged in the shell, and a direct-current double-arm bridge circuit is arranged on the circuit board; the circuit board is also provided with a switch which is connected in series with the direct-current double-arm bridge circuit, a spring part for controlling the switch to be opened and closed is arranged in the shell, and the switch is disconnected under the natural state of the spring part; and when the spring part is in a deformed state, the switch is closed. According to the switching device for the physical direct-current double-arm bridge, due to the arrangement of the button and the spring part, when the switching device is in a wiring state of a wiring terminal, a direct-current double-arm bridge circuit can be kept in a power-on state to work only if an operator keeps a state that the button is pressed all the time, and once the operator releases the button, the switch is restored to a disconnected state under the action of the rebound force of the spring part, so that the switch is disconnected, and the direct-current double-arm bridge circuit is powered off.)

1. A switching device used in a physical direct current double-arm bridge is characterized by comprising a shell (2) and a circuit board (1), wherein the circuit board (1) is arranged in the shell (2), and a direct current double-arm bridge circuit is arranged on the circuit board (1);

the circuit board (1) is also provided with a switch (K) which is connected in series with the direct-current double-arm bridge circuit, a spring part (8) for controlling the switch (K) to open and close is arranged in the shell (2), and the switch (K) is disconnected under the natural state of the spring part (8); when the spring element (8) is in a deformation state, the switch (K) is closed;

the upper surface of the shell (2) is provided with a button (3) which penetrates through the shell (2) and is connected with the spring part (8), and when the spring part (8) is in a natural state, the button (3) is in a convex state; when the button (3) is pressed down, the spring element (8) is in a deformation state;

the upper surface of the shell (2) is also provided with a binding post (4) for connecting a power supply; the binding post (4) is connected with a power supply, and when the button (3) is in a pressed state, the direct-current double-arm bridge circuit is electrified and works.

2. Switching device in a physical dc double arm bridge according to claim 1, characterized in that the spring element (8) consists of a spring (6) and a conductor (7), and the switch (K) consists of two stationary terminals (K0) connected in series in the circuit; the spring (6) is arranged on the circuit board (1), the conductor (7) is arranged at the top of the spring (6), and the button (3) is connected with the conductor (7); when the spring (6) is in the original length, the conductor (7) is far away from two fixed terminals (K0) of the switch (K); when the button (3) is pressed, the spring (6) is compressed, the conductor (7) abuts against two fixed terminals (K0) of the switch (K), and the two fixed terminals (K0) are electrically connected.

3. The switching device for a physical dc double arm bridge according to claim 2, wherein the spring (6) is provided with a telescopic rod at its inner circumference, and the two ends of the telescopic rod are connected to the circuit board (1) and the conductor (7), respectively.

4. Switching device in a physical dc double arm bridge according to claim 1, characterized in that the switch (K) is a single pole double throw switch, the spring element (8) is mounted inside the throwing knife and the push button (3) is connected to the throwing knife.

5. Switching device in a physical dc double arm bridge according to any of claims 1 to 4, characterized in that a rubber sleeve (5) is filled between the push button (3) and the housing (2).

Technical Field

The invention relates to the technical field of circuits, in particular to a switching device used in a physical direct-current double-arm bridge.

Background

Direct current double arm bridge sets up comparatively general experimental project in college's physical experiment, this experiment is used for measuring low value resistance, the switch that uses in this experiment mainly still is the single-pole single-throw type that often uses in the physical circuit experiment, double-pole double-throw type switch, these two kinds of switches simple structure, it is succinct to operate, but direct current double arm bridge is because resistance in the circuit is very little, if long-time circular telegram can lead to the circuit to generate heat, make resistance measurement error increase, nevertheless the student often can forget or let the switch be in the closed state for a long time when doing the experiment, lead to the experiment failure to be in

Disclosure of Invention

Based on the technical problems in the background art, the invention provides a switching device for a physical direct-current double-arm bridge.

The invention provides a switching device for a physical direct-current double-arm bridge, which comprises a shell and a circuit board, wherein the circuit board is arranged in the shell, and a direct-current double-arm bridge circuit is arranged on the circuit board;

the circuit board is also provided with a switch which is connected in series with the direct-current double-arm bridge circuit, a spring part for controlling the switch to be opened and closed is arranged in the shell, and the switch is disconnected under the natural state of the spring part; the switch is closed when the spring part is in a deformed state;

the upper surface of the shell is provided with a button which penetrates through the shell and is connected with the spring part, and when the spring part is in a natural state, the button is in a convex state; when the button is pressed, the spring part is in a deformation state;

the upper surface of the shell is also provided with a binding post for connecting a power supply; the binding post is connected with a power supply, and when the button is in a pressed state, the direct-current double-arm bridge circuit is electrified and works.

Preferably, the spring element consists of a spring and a conductor, and the switch consists of two stationary terminals connected in series in the circuit; the spring is arranged on the circuit board, the conductor is arranged on the top of the spring, and the button is connected with the conductor; when the spring is in the original length, the conductor is far away from the two immovable terminals of the switch; when the button is pressed, the spring is compressed, the conductor is abutted against two immovable terminals of the switch, and the two immovable terminals are electrically connected.

Preferably, the inner periphery of the spring is provided with a telescopic rod, and two ends of the telescopic rod are respectively connected with the circuit board and the conductor.

Preferably, the switch adopts a single-pole double-throw switch, the spring part is arranged on the inner side of the throwing knife, and the button is connected with the throwing knife.

Preferably, a rubber sleeve is filled between the button and the shell.

According to the switching device for the physical direct-current double-arm bridge, due to the arrangement of the button and the spring part, when the switching device is in a wiring state of a wiring terminal, a direct-current double-arm bridge circuit can be kept in a power-on state to work only if an operator keeps a state that the button is pressed all the time, and once the operator releases the button, the switch is restored to a disconnected state under the action of the rebound force of the spring part, so that the switch is disconnected, and the direct-current double-arm bridge circuit is powered off.

According to the invention, through the arrangement of the spring part and the button, the automatic power-off of the direct-current double-arm bridge circuit is realized, and the potential safety hazards such as heating and the like caused by the fact that the direct-current double-arm bridge circuit is in a power-on state for a long time are avoided.

Drawings

FIG. 1 is a schematic diagram of a DC dual bridge circuit;

fig. 2 is an overall structural diagram of a switching device used in a physical dc double-arm bridge according to the present invention;

FIG. 3 is a schematic view showing a spring member mounting structure in embodiment 1;

fig. 4 is a schematic view of the spring member mounting structure in embodiment 2.

The figure is as follows: the circuit board comprises a circuit board 1, a shell 2, a button 3, a binding post 4, a switch K and a rubber sleeve 5;

example 1:

spring 6, conductor 7, stationary terminal K0;

example 2:

a spring element 8.

Detailed Description

Referring to fig. 1, the switching device for physical dc double-arm bridge according to the present invention includes a housing 2 and a circuit board 1, the circuit board 1 is installed in the housing 2, and the dc double-arm bridge circuit is disposed on the circuit board 1.

Still be equipped with the switch K of establishing ties on direct current both arms bridge circuit on the circuit board 1, the casing 2 is inside to be equipped with the spring part 8 that is used for controlling switch K to open and shut, and under the spring part 8 natural state, switch K disconnection. And when the spring part 8 is in a deformed state, the switch K is closed.

The upper surface of the shell 2 is provided with a button 3 which penetrates through the shell 2 and is connected with the spring part 8, and the button 3 is in a convex state when the spring part 8 is in a natural state. When the button 3 is pressed, the spring element 8 is in a deformed state. A rubber sleeve 5 is filled between the button 3 and the shell 2 to avoid friction damage.

The upper surface of the shell 2 is also provided with a binding post 4 for connecting a power supply. The binding post 4 is connected with a power supply, and when the button 3 is in a pressed state, the direct current double-arm bridge circuit is electrified and works.

In this embodiment, by the arrangement of the button 3 and the spring member 8, the switching device is in the wiring state of the terminal 4, only if the operator keeps the state that the button 3 is pressed down all the time, the dc double-arm bridge circuit can be kept in the power-on state to work, and once the operator releases the button 3, the switch K is restored to the off state under the action of the rebound force of the spring member 8, so that the switch is turned off, and the dc double-arm bridge circuit is powered off.

In the embodiment, the spring element 8 and the button 3 are arranged, so that the automatic power-off of the direct-current double-arm bridge circuit is realized, and the potential safety hazards of heating and the like caused by the fact that the direct-current double-arm bridge circuit is in a power-on state for a long time are avoided.

Example 1

Referring to fig. 3, in this embodiment, the spring element 8 consists of a spring 6 and a conductor 7, and the switch K consists of two stationary terminals K0 connected in series in the circuit. The spring 6 is arranged on the circuit board 1, the conductor 7 is arranged on the top of the spring 6, and the button 3 is connected with the conductor 7; when the spring 6 is in the original length, the conductor 7 is far away from two fixed terminals K0 of the switch K; when the push-button 3 is pressed, the spring 6 is compressed, the conductor 7 abuts against the two stationary terminals K0 of the switch K, and the two stationary terminals K0 are electrically connected.

In this embodiment, the inner periphery of the spring 6 is provided with a telescopic rod, and two ends of the telescopic rod are respectively connected with the circuit board 1 and the conductor 7. So, can lead spring 6 is flexible through the telescopic link to draw conductor 7 motion, guarantee conductor 7 and the effective electric connection of motionless terminal K0.

Example 2

Referring to fig. 4, in the present embodiment, the switch K is a single-pole double-throw switch, the spring member 8 is installed inside the throwing blade, and the push button 3 is connected to the throwing blade. Thus, in a natural state, the switch is turned off; when the button 3 is pressed, the switch is closed; after the button 3 is released, the throwing knife is reset due to the restoration of the deformation of the spring element 8, and the switch is restored to the off state.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.