Fire-fighting circuit breaker

Abstract

The utility model relates to the technical field of power electronics, and discloses a fire-fighting circuit breaker. The fire-fighting circuit breaker comprises a circuit breaker which forms a first power-on loop with a fire-fighting signal interface; the circuit breaker comprises a voltage amplifier which is used for amplifying a fire-fighting signal to a tripping threshold voltage; the circuit breaker is also electrically connected with a fire-fighting switch; the fire-fighting switch is used for closing or opening an external fire-fighting equipment line; the tripper, the circuit breaker and the auxiliary switch form a second power-on loop, and the tripper is used for opening the circuit breaker when the fire-fighting signal reaches a tripping threshold voltage so as to disconnect the fire-fighting switch; and when the fire-fighting switch is switched off, the auxiliary switch cuts off the second power-on loop. According to the circuit, the auxiliary switch is arranged to cut off the power supply of the tripper after the tripper trips, so that the tripper is prevented from being damaged due to long-term power supply.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics, in particular to a fire protection circuit breaker. Background Art

[0002] A circuit breaker is a switch device that can close, carry and disconnect current under normal circuit conditions and close, carry and disconnect current under abnormal circuit conditions within a specified time. A release is a device that is mechanically connected to the circuit breaker and is used to release the holding mechanism and automatically disconnect the circuit breaker.

[0003] The fire circuit breaker is a protective device installed on the circuit of the fire-fighting equipment. When the circuit current is too large, causing the circuit load to be overloaded or a short circuit occurs, the circuit breaker will immediately cut off the circuit to protect the fire-fighting equipment and avoid fire accidents. In actual application scenarios, a fire signal is usually sent through a fire control system to trigger the fire circuit breaker to open. However, when the fire signal interface is far away from the fire circuit breaker, the voltage will be reduced due to the long line, and the tripping action of the release cannot be triggered, and the fire circuit breaker cannot be opened, and the fire protection function is lost. Moreover, even if the release is tripped, it will be in a power supply state for a long time due to the formation of an energized circuit with the fire signal, which will damage its service life. Utility Model Content

[0004] In view of this, the utility model provides a fire circuit breaker to solve the problem that the release is in a power supply state for a long time and the service life is damaged. The technical solution is as follows:

[0005] A fire protection circuit breaker is provided, comprising:

[0006] A circuit breaker forms a first power-on loop with the fire signal interface; the circuit breaker includes a voltage amplifier for amplifying the fire signal to a trip threshold voltage; the circuit breaker is also electrically connected to a fire switch, and the fire switch is used to close or disconnect the external fire equipment line;

[0007] The release forms a second power-on circuit with the circuit breaker and the auxiliary switch, and is used to trip the circuit breaker when the fire signal reaches a tripping threshold voltage to disconnect the fire switch; the auxiliary switch cuts off the second power-on circuit when the fire switch is disconnected.

[0008] The above scheme, by setting a voltage amplifier in the circuit breaker, can amplify the fire signal to the tripping threshold voltage when the distance between the fire signal interface and the fire circuit breaker is far, resulting in a decrease in the fire signal voltage, making the release insensitive and unable to trip, and difficult to drive the circuit breaker to open. The release can trigger the trip normally, so that the circuit breaker is opened, and then play a fire protection role, thereby improving the reliability of the fire circuit breaker. In addition, by setting an auxiliary switch in the second power-on circuit, the second power-on circuit is cut off after the circuit breaker is opened, and the continuous power supply to the release is disconnected on the premise of ensuring that the fire circuit breaker plays a fire protection role, so that the release is out of the long-term power supply state, reducing damage to the release and increasing the service life of the release.

[0009] In an optional implementation, the auxiliary switch is provided with a first contact, a second contact and a third contact; the first contact is electrically connected to the circuit breaker; the second contact is electrically connected to the release; and the third contact is grounded.

[0010] In an optional embodiment, the auxiliary switch is further provided with a rotary switch, the first end of the rotary switch is connected to the first contact; the second end of the rotary switch is connected to the second contact; or the second end of the rotary switch is connected to the third contact.

[0011] In an optional implementation, when the fire switch is disconnected, the second end of the rotary switch is converted from being connected to the second contact to being connected to the third contact.

[0012] In an optional implementation, the fire switch includes a switch shaft; when the switch shaft rotates, the rotary switch of the auxiliary switch is driven to rotate.

[0013] In an optional implementation, the circuit breaker is a switch built-in circuit breaker.

[0014] The above solution, by setting the fire switch inside the circuit breaker, occupies less space and is easier to install.

[0015] In an optional implementation, the release is a flux release. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1It is a structural schematic diagram of a fire protection circuit breaker according to an embodiment of the utility model;

[0018] Figure 2 It is a structural schematic diagram of another fire protection circuit breaker according to an embodiment of the utility model. DETAILED DESCRIPTION

[0019] 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.

[0020] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] 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.

[0022] 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.

[0023] A circuit breaker is a switch device that can close, carry and disconnect current under normal circuit conditions and close, carry and disconnect current under abnormal circuit conditions within a specified time. A release is a device that is mechanically connected to the circuit breaker and is used to release the holding mechanism and automatically disconnect the circuit breaker.

[0024] The fire circuit breaker is a protective device installed on the circuit of the fire equipment. When the circuit current is too large, causing the circuit load to be overloaded or a short circuit occurs, the release will trip and the circuit breaker will be opened to immediately cut off the circuit, protect the fire equipment, and avoid fire accidents. However, when the fire signal is far away from the fire circuit breaker, the voltage will be reduced due to the long line, and the tripping action of the release cannot be triggered, and the fire circuit breaker cannot be opened, and the fire protection function is lost. Moreover, even if the release is tripped, it will be in a power supply state for a long time due to the formation of an energized circuit with the fire signal, which will damage the service life of the release.

[0025] Therefore, an embodiment of the utility model provides a fire circuit breaker, which achieves the effect of disconnecting the power supply of the release by setting an auxiliary switch.

[0026] Figure 1 Schematic diagram of the structure of a fire protection circuit breaker according to an embodiment of the utility model. Figure 1 As shown, in the fire circuit breaker, a circuit breaker and a tripper are included. The circuit breaker and the fire signal interface form a first power-on circuit. A voltage amplifier is also provided in the circuit breaker for amplifying the fire signal to a tripping threshold voltage. The circuit breaker is also electrically connected to a fire switch, which is used to close or disconnect the external fire equipment line. The tripper, the circuit breaker and the auxiliary switch form a second power-on circuit, which is used to open the circuit breaker when the fire signal reaches the tripping threshold voltage to disconnect the fire switch. The auxiliary switch cuts off the second power-on circuit when the fire switch is disconnected.

[0027] Figure 1 The working principle of the fire protection circuit breaker shown is as follows:

[0028] External fire-fighting equipment is equipment that can realize functions such as fire monitoring and fire warning, such as fire alarm systems. In actual application scenarios, there may be a unified fire control system that monitors the working status of multiple external fire-fighting equipment. In this embodiment, taking the control of an external fire-fighting equipment as an example, when the external fire-fighting equipment is overloaded or short-circuited, the fire control system sends a fire signal to the fire circuit breaker corresponding to the external fire-fighting equipment through the fire signal interface. The fire signal interface and the circuit breaker in the fire circuit breaker of this application form a first power-on circuit.

[0029] When the distance between the fire signal interface and the circuit breaker is far, the fire signal voltage reaching the circuit breaker may be too low to trigger the tripping action of the release due to the consumption of electric energy by the long wire. Therefore, the circuit breaker of the present application is provided with an amplifier, which can amplify the fire signal to the tripping threshold voltage, and the tripping threshold voltage can be set according to actual needs. After the circuit breaker amplifies the fire signal to the tripping threshold voltage through the amplifier, the amplified fire signal is transmitted to the second power-on circuit formed by the release, the circuit breaker and the auxiliary switch. The release triggers the protection mechanism because the fire signal reaches the tripping threshold voltage, so that the circuit breaker is opened and the fire switch is disconnected. The fire switch can close or disconnect the external fire equipment line. After the fire switch is disconnected, the external fire equipment line is disconnected and the external fire equipment stops working, that is, the function of timely protecting the external fire equipment is realized.

[0030] Furthermore, even if the circuit breaker is opened and disconnects the external fire-fighting equipment line, the first power-on circuit composed of the circuit breaker and the fire-fighting signal interface is still in a power-on state, and then the second power-on circuit is also in a power-on state. The releaser will age due to being in a power-on state for a long time, and its service life will be shortened, affecting its performance or causing economic losses. Therefore, the present application provides an auxiliary switch in the second power-on circuit. The closed or open state of the auxiliary switch is synchronized with the closed or open state of the fire-fighting switch. When the fire-fighting switch is disconnected, the auxiliary switch is also disconnected, and the second power-on circuit is cut off, thereby disconnecting the power supply to the releaser, thereby realizing the function of timely protecting the releaser.

[0031] Figure 2 It is a structural schematic diagram of another fire protection circuit breaker according to an embodiment of the utility model. In an optional embodiment, the auxiliary switch is provided with a first contact A1, a second contact A2 and a third contact A3, the first contact A1 is electrically connected to the circuit breaker, the second contact A2 is electrically connected to the release, and the third contact A3 is grounded. The second contact A2 is a normally closed contact, and the third contact A3 is a normally open contact. Under normal circumstances, the first contact A1 is connected to the second contact A2, so that the second power-on circuit is in a normal access state. After the release is tripped, the first contact A1 is switched to be connected to the third contact A3, and the second power-on circuit is disconnected.

[0032] In an optional embodiment, the auxiliary switch is further provided with a rotary switch, the first end of the rotary switch is connected to the first contact A1, the second end of the rotary switch is connected to the second contact A2, or the second end of the rotary switch is connected to the third contact A3. The first contact A1 is connected to the second contact A2 or the third contact A3 through the rotary switch.

[0033] In an optional embodiment, when the fire switch is disconnected, the second end of the rotary switch is switched from being connected to the second contact A2 to being connected to the third contact A3. Under normal circumstances, the first contact A1 is connected to the second contact A2 through the rotary switch, so that the second power circuit is in a normal access state. After the release is tripped, the rotary switch rotates, and the first contact A1 is switched to being connected to the third contact A3 through the rotary switch, cutting off the second power circuit.

[0034] In an optional embodiment, the fire switch includes a switch shaft, and when the switch shaft rotates, the rotary switch of the auxiliary switch is driven to rotate. The closed or disconnected state of the auxiliary switch is synchronized with the closed or disconnected state of the fire switch through a mechanical structure. When the switch in the fire switch rotates, the rotary switch of the auxiliary switch can be rotated. Specifically, when the fire switch is disconnected, the switch shaft rotates, driving the rotary switch of the auxiliary switch to rotate, and the first contact A1 is converted from being connected to the second contact A2 through the rotary switch to being connected to the third contact A3 through the rotary switch to cut off the second power-on circuit.

[0035] In an optional implementation, the circuit breaker is a switch-built-in circuit breaker, that is, the fire switch is arranged inside the circuit breaker, which occupies less space and is easier to install.

[0036] In an optional embodiment, the release is a flux release. When the voltage received by the release reaches the tripping threshold voltage, the magnetic force generated is sufficient to drive the circuit breaker to open. Exemplarily, the release includes a coil and an armature or an iron core wound by the coil, and the circuit breaker includes a closing lever balance system and an opening spring. When current flows through the release, the coil is excited, and when the voltage received by the release reaches the tripping threshold voltage, the electromagnetic force generated by the electromagnet is greater than the reaction force of the opening spring, and the armature or the iron core is attracted by the electromagnet, driving the closing lever balance system of the circuit breaker, so that the circuit breaker trips under the action of the opening spring.

[0037] The fire circuit breaker mentioned above, by setting a voltage amplifier in the circuit breaker, can amplify the fire signal to the tripping threshold voltage when the distance between the fire signal interface and the fire circuit breaker is far, resulting in a decrease in the fire signal voltage, making the release insensitive and unable to trip, and difficult to drive the circuit breaker to open. The release can trigger the trip normally, so that the circuit breaker is opened, and then play a fire protection role, thereby improving the reliability of the fire circuit breaker. In addition, by setting an auxiliary switch in the second power-on circuit, the second power-on circuit is cut off after the circuit breaker is opened, and the continuous power supply to the release is disconnected on the premise of ensuring that the fire circuit breaker plays a fire protection role, so that the release is out of the long-term power supply state, reducing damage to the release and improving the service life of the release.

[0038] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the utility model disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0039] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A fire circuit breaker, characterized in that: The fire circuit breaker comprises: A circuit breaker forms a first power-on loop with the fire signal interface; the circuit breaker includes a voltage amplifier for amplifying the fire signal to a trip threshold voltage; the circuit breaker is also electrically connected to a fire switch, and the fire switch is used to close or disconnect the external fire equipment line; The release forms a second power-on circuit with the circuit breaker and the auxiliary switch, and is used to trip the circuit breaker when the fire signal reaches a tripping threshold voltage to disconnect the fire switch; the auxiliary switch cuts off the second power-on circuit when the fire switch is disconnected.

2. The fire circuit breaker according to claim 1, characterized in that: The auxiliary switch is provided with a first contact, a second contact and a third contact; the first contact is electrically connected to the circuit breaker; the second contact is electrically connected to the release; and the third contact is grounded.

3. The fire circuit breaker according to claim 2, characterized in that: The auxiliary switch is further provided with a rotary switch, wherein a first end of the rotary switch is connected to a first contact; a second end of the rotary switch is connected to a second contact; or a second end of the rotary switch is connected to a third contact.

4. The fire protection circuit breaker according to claim 3, characterized in that: When the fire switch is disconnected, the second end of the rotary switch is converted from being connected to the second contact to being connected to the third contact.

5. The fire protection circuit breaker according to claim 3, characterized in that: The fire switch comprises a switch shaft; when the switch shaft rotates, the rotary switch of the auxiliary switch is driven to rotate.

6. The fire protection circuit breaker according to claim 1, characterized in that: The circuit breaker is a switch built-in circuit breaker.

7. The fire circuit breaker according to claim 1, characterized in that: The release is a flux release.

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