Temperature switch with metal shielding layer and thermal protection circuit of medium-high voltage electromagnetic device

Abstract

The utility model discloses a temperature switch with a metal shielding layer, which is applied to a thermal protection circuit of a middle-high voltage electromagnetic device and comprises a temperature switch main body and the metal shielding layer sleeved outside the temperature switch main body. The end parts of the two leads of the temperature switch main body extend out of the cavity and are positioned outside the metal shielding layer; and one end of the metal shielding layer is provided with a connecting wire for grounding. According to the temperature switch with the metal shielding layer, the temperature switch main body and the metal shielding layer sleeved outside the temperature switch main body are arranged, and one end of the metal shielding layer is grounded through the connecting wire, so that the influence of generated induced voltage on the thermal protection circuit is solved, the normal work of the thermal protection circuit is ensured, and the service life of the thermal protection circuit is prolonged. Normal work of the temperature switch with the metal shielding layer is ensured, and overheat protection is carried out on a medium-high voltage electromagnetic device through temperature detection. The utility model also provides a thermal protection circuit of the medium-high voltage electromagnetic device.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic circuit technical field especially, relates to a temperature switch with metal shielding layer and middle high voltage electromagnetic device heat protection circuit. BACKGROUND

[0002] With the development of science and technology, the working voltage of electromagnetic device gradually increases, but the insulating material of electromagnetic device needs to be overheated protection, the existing electromagnetic device adopts temperature detection device to cooperate with software with alarm function to carry out overheated protection, but, in high voltage field intensity, usually induction voltage is generated, and the induction voltage is too large to easily influence the normal work of circuit, even causes short circuit or burns and other problems. SUMMARY

[0003] The utility model solves the technical problem that provide a temperature switch with metal shielding layer and middle high voltage electromagnetic device heat protection circuit to solve the problem that induction voltage is too large in high voltage field intensity and influences the normal work of heat protection circuit.

[0004] Firstly, the utility model provides a temperature switch with metal shielding layer is applied to middle high voltage electromagnetic device heat protection circuit, and the temperature switch with metal shielding layer includes temperature switch main part and the metal shielding layer of sleeve setting in temperature switch main part, and the one end of metal shielding layer is recessed inward and forms the cavity for temperature switch main part setting, and the end of two lead wires of temperature switch main part is stretched out in the cavity and is located outside metal shielding layer, and one end of metal shielding layer is equipped with the connecting wire for grounding.

[0005] Secondly, the utility model further provides a middle high voltage electromagnetic device heat protection circuit, and is connected with middle high voltage electromagnetic device, and includes circuit breaker and above-mentioned temperature switch with metal shielding layer, and the temperature switch with metal shielding layer is installed in middle high voltage electromagnetic device, and one end of temperature switch with metal shielding layer is connected with power supply, and the other end of temperature switch with metal shielding layer is connected with circuit breaker, and middle high voltage electromagnetic device is connected with circuit breaker.

[0006] The beneficial technical effects of the utility model are that: the temperature switch with metal shielding layer of the utility model sets up including temperature switch main part and the metal shielding layer of sleeve setting in temperature switch main part, and one end of metal shielding layer is grounded through connecting wire, to utilize the reflection and skin effect of metal shielding layer, so that the voltage of temperature switch main part in metal shielding layer is small, the influence of generated induction voltage on heat protection circuit is solved, the normal work of heat protection circuit is guaranteed, the normal work of temperature switch with metal shielding layer is guaranteed, to carry out overheated protection to middle high voltage electromagnetic device through detecting temperature, which is beneficial to the overheated protection work of heat protection circuit to middle high voltage electromagnetic device. BRIEF DESCRIPTION OF DRAWINGS

[0007] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0008] Figure 1 The structural schematic diagram of the temperature switch with a metal shielding layer provided by the present application;

[0009] Figure 2 The schematic diagram of the first embodiment of the high-voltage electromagnetic device thermal protection circuit applied to the high-voltage electromagnetic device provided by the present application;

[0010] Figure 3 The schematic diagram of the second embodiment of the high-voltage electromagnetic device thermal protection circuit applied to the high-voltage electromagnetic device provided by the present application;

[0011] Figure 4 The schematic diagram of a specific embodiment of the connection between the temperature switch with a metal shielding layer and the control part of the circuit breaker in the high-voltage electromagnetic device thermal protection circuit provided by the present application;

[0012] Figure 5 The schematic diagram of another specific embodiment of the connection between the temperature switch with a metal shielding layer and the control part of the circuit breaker in the high-voltage electromagnetic device thermal protection circuit provided by the present application. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0014] Please refer to Figure 1 , Figure 1 The structural schematic diagram of the temperature switch with a metal shielding layer provided by the present application, the temperature switch with a metal shielding layer 1 is applied to the high-voltage electromagnetic device thermal protection circuit, the temperature switch with a metal shielding layer 1 comprises a temperature switch main body 11 and a metal shielding layer 12 sleeved outside the temperature switch main body 11, one end of the metal shielding layer 12 is inwardly recessed to form a cavity for arranging the temperature switch main body 11, the end portions of the two lead wires of the temperature switch main body 11 extend out of the cavity and are located outside the metal shielding layer 12, and one end of the metal shielding layer 12 is provided with a connecting line GND for grounding.

[0015] When the temperature switch 1 with the metal shielding layer is used, the connecting line GND is grounded to make the metal shielding layer 12 grounded. The temperature switch 1 with the metal shielding layer is provided with the temperature switch body 11 and the metal shielding layer 12 sleeved outside the temperature switch body 11, and one end of the metal shielding layer 12 is grounded through the connecting line GND, so that the ground voltage of the temperature switch body 11 in the metal shielding layer 12 is small by using the reflection and skin effect of the metal shielding layer 12, the influence of the induced voltage on the thermal protection circuit is solved, the normal work of the thermal protection circuit is ensured, the normal work of the temperature switch 1 with the metal shielding layer is ensured, and the overheat protection of the medium and high voltage electromagnetic device by detecting the temperature is facilitated.

[0016] Specifically, in the embodiment, the temperature switch body 11 includes a switch fixed end, a switch action end and a bimetallic strip. The switch fixed end and the switch action end are oppositely arranged, and the bimetallic strip is connected with the switch action end. The switch fixed end is connected with one lead wire, and the switch action end is connected with another lead wire. The bimetallic strip is a thermal bimetallic strip. When the temperature rises to a preset temperature threshold, the bimetallic strip deforms, the switch action end connected with the bimetallic strip acts, the on-off state between the switch action end and the switch fixed end changes, and the connection between the power supply and the medium and high voltage electromagnetic device is disconnected, so that the medium and high voltage electromagnetic device can be protected when the temperature reaches the preset temperature threshold. When the temperature drops below the preset temperature threshold, the bimetallic strip returns to its original state, the switch action end connected with the bimetallic strip acts, the original on-off state between the switch action end and the switch fixed end is restored, and the connection between the power supply and the medium and high voltage electromagnetic device is restored, so that the medium and high voltage electromagnetic device can continue to work normally.

[0017] Specifically, the metal shielding layer 12 is made of conductive metal material, which includes but is not limited to copper, aluminum and / or silver, etc.

[0018] Specifically, the metal shielding layer 12 has a columnar structure, and the cavity also has a columnar structure. The material and cross-sectional area of the metal shielding layer can be designed according to actual needs.

[0019] In combination with Figure 2 and Figure 3 , Figure 2 and Figure 3The high-voltage electromagnetic device thermal protection circuit is connected with the high-voltage electromagnetic device 8, and includes a circuit breaker 9 and the temperature switch 1 with a metal shielding layer. The temperature switch 1 with a metal shielding layer is installed on the high-voltage electromagnetic device 8. One end of the temperature switch 1 with a metal shielding layer is connected with a power supply, and the other end of the temperature switch 1 with a metal shielding layer is connected with the circuit breaker 9.

[0020] The temperature switch 1 with a metal shielding layer is connected with the control end of the circuit breaker 9 to control the on-off of the circuit breaker 9. The number of the temperature switch 1 with a metal shielding layer and the number of the circuit breaker 9 can be set and adjusted according to actual needs. The high-voltage electromagnetic device thermal protection circuit sets the circuit breaker 9 and the temperature switch 1 with a metal shielding layer to solve the influence of the induced voltage on the thermal protection circuit, ensure the normal work of the thermal protection circuit, ensure the normal work of the temperature switch 1 with a metal shielding layer, and protect the high-voltage electromagnetic device 8 from overheating by detecting temperature. The two ends of the temperature switch 1 with a metal shielding layer are respectively connected with the power supply and the circuit breaker 9 to control the state of the circuit breaker 9 through the temperature switch 1 with a metal shielding layer, and then control the on-off of the connection circuit of the high-voltage electromagnetic device 8 and the power supply, and realize over-temperature protection. Figure 2 In the embodiment, the high-voltage electromagnetic device 8 is a reactor, and the number of the temperature switch 1 with a metal shielding layer and the number of the circuit breaker 9 are both one. Figure 3 In the embodiment, the high-voltage electromagnetic device 8 is a transformer, the number of the temperature switch 1 with a metal shielding layer is one, and the number of the circuit breaker 9 is two. The control ends of the two circuit breakers 9 are respectively connected with the temperature switch 1 with a metal shielding layer. The temperature switch 1 with a metal shielding layer can be connected with the primary winding of the transformer. One end of the secondary winding of the transformer is connected with one of the circuit breakers 9, and the other end of the secondary winding of the transformer is connected with the other circuit breaker 9.

[0021] Preferably, the maximum voltage of the high-voltage electromagnetic device 8 is not less than 2000V.

[0022] Specifically, the high-voltage electromagnetic device thermal protection circuit further includes a controller 5. The temperature switch 1 with a metal shielding layer is connected with the circuit breaker 9 through the controller 5.

[0023] Reference Figure 4, specifically, the temperature switch with metal shielding layer 1 is a normally open temperature switch, one end of the temperature switch with metal shielding layer 1 is connected with the power supply, the other end of the temperature switch with metal shielding layer 1 is connected with the coil 2 of the circuit breaker 9 to control the on-off of the circuit breaker 9. When the temperature of the medium and high voltage electromagnetic device rises to a preset temperature threshold, the state of the temperature switch with metal shielding layer 1 is switched to closed, the coil 2 of the circuit breaker 9 is powered, so that the circuit breaker 9 is opened, so that the connection circuit of the power supply and the medium and high voltage electromagnetic device 8 is disconnected, and the overheat protection of the medium and high voltage electromagnetic device 8 is realized.

[0024] With reference to Figure 5 , specifically, the temperature switch with metal shielding layer 1 is a normally closed temperature switch, the controller 9 includes a relay, the temperature switch with metal shielding layer 1 and the coil 3 of the relay are connected in series, the coil 2 of the circuit breaker 9 and the normally open point 4 of the relay are connected in series, the temperature switch with metal shielding layer 1 and the coil 3 of the relay connected in series are connected in parallel with the coil 2 of the circuit breaker 9 and the normally open point 4 of the relay connected in series, one end of the temperature switch with metal shielding layer 1 is connected with the power supply, and the other end of the coil 2 of the circuit breaker 9 is connected with the power supply. The normally open point 4 of the relay is connected with the other end of the coil 2 of the circuit breaker 9, and the state of the normally open point 4 of the relay is controlled by the coil 3 of the relay. The coil 3 of the relay is connected with the other end of the temperature switch with metal shielding layer 1. When the temperature of the medium and high voltage electromagnetic device rises to a preset temperature threshold, the state of the temperature switch with metal shielding layer 1 is switched to open, the coil 3 of the relay loses power, so that the normally open point 4 of the relay is closed, so that the coil 2 of the circuit breaker 9 is powered, the circuit breaker 9 is controlled to be opened, so that the connection circuit of the power supply and the medium and high voltage electromagnetic device 8 is disconnected, and the overheat protection of the medium and high voltage electromagnetic device 8 is realized.

[0025] In summary, the temperature switch with metal shielding layer of the utility model through setting including temperature switch main part and the metal shielding layer of setting in temperature switch main body outside, and one end of metal shielding layer is connected with ground through connecting line, with the reflection and skin effect of metal shielding layer, make the temperature switch main body in metal shielding layer's voltage to ground is small, solve the influence of induced voltage to thermal protection circuit, guarantee the normal work of thermal protection circuit, guarantee the normal work of temperature switch with metal shielding layer, to carry out overheat protection to medium and high voltage electromagnetic device through detecting temperature, it is favorable to the overheat protection work of thermal protection circuit to medium and high voltage electromagnetic device. The medium and high voltage electromagnetic device thermal protection circuit of the utility model also has the above functions.

[0026] The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements should be encompassed within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A temperature switch with a metal shield, characterized in that The temperature switch with a metal shielding layer is applied to a thermal protection circuit of a medium and high voltage electromagnetic device, and comprises a temperature switch body and a metal shielding layer sleeved outside the temperature switch body. One end of the metal shielding layer is inwardly recessed to form a cavity for arranging the temperature switch body. The end portions of two lead wires of the temperature switch body are arranged outside the metal shielding layer. One end of the metal shielding layer is provided with a connecting wire for grounding.

2. The temperature switch with a metal shield according to claim 1, characterized in that The temperature switch body comprises a switch fixed end, a switch action end and a bimetallic strip. The switch fixed end and the switch action end are oppositely arranged. The bimetallic strip is connected with the switch action end. The switch fixed end is connected with one lead wire. The switch action end is connected with the other lead wire.

3. The temperature switch with a metal shield according to claim 1, wherein The metal shielding layer is made of conductive metal material.

4. The temperature switch with a metal shield according to claim 1, wherein The metal shielding layer has a columnar structure.

5. A thermal protection circuit for a medium-high voltage electromagnetic device, characterized in that, The temperature switch with a metal shielding layer is connected with a medium and high voltage electromagnetic device, and comprises a circuit breaker and the temperature switch with a metal shielding layer according to any one of claims 1-4. The temperature switch with a metal shielding layer is arranged in the medium and high voltage electromagnetic device. One end of the temperature switch with a metal shielding layer is connected with a power supply. The other end of the temperature switch with a metal shielding layer is connected with the circuit breaker. The medium and high voltage electromagnetic device is connected with the circuit breaker.

6. The thermal protection circuit for medium-high voltage electromagnetic devices according to claim 5, characterized in that, The temperature switch with a metal shielding layer is a normally open temperature switch. One end of the temperature switch with a metal shielding layer is connected with a power supply. The other end of the temperature switch with a metal shielding layer is connected with a coil of the circuit breaker, so as to control the on-off of the circuit breaker.

7. The thermal protection circuit for medium-high voltage electromagnetic devices according to claim 5, characterized in that, The thermal protection circuit of the medium and high voltage electromagnetic device further comprises a controller. The temperature switch with a metal shielding layer is connected with the circuit breaker through the controller.

8. The thermal protection circuit for medium-high voltage electromagnetic devices according to claim 7, characterized in that, The temperature switch with a metal shielding layer is a normally closed temperature switch. The controller comprises a relay. The temperature switch with a metal shielding layer and the coil of the relay are connected in series. The coil of the circuit breaker and the normally open point of the relay are connected in series. The temperature switch with a metal shielding layer and the coil of the relay connected in series are connected in parallel with the coil of the circuit breaker and the normally open point of the relay connected in series. One end of the temperature switch with a metal shielding layer is connected with a power supply.

9. The thermal protection circuit for medium-high voltage electromagnetic devices according to claim 5, characterized in that, The medium and high voltage electromagnetic device is a transformer or a reactor.

10. The thermal protection circuit for medium-high voltage electromagnetic devices according to claim 5, characterized in that, The maximum voltage of the medium and high voltage electromagnetic device is not less than 2000V.

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