An over-temperature protection device

Abstract

This invention provides an over-temperature protection device, belonging to the field of over-temperature protection technology. It includes a housing, inside which are disposed a sensing element, a retaining element, and a protection mechanism. The sensing element is made of a magnetic metal material with a Curie temperature. The protection mechanism is used for alarm or release tripping. When the equipment is running, the ambient temperature gradually rises. When the temperature is below the Curie point of the sensing element, it is in a normal state, the sensing element inside the device maintains its magnetism, continuously attracting the retaining element, and the protection mechanism is not triggered. When the temperature exceeds the Curie temperature, the sensing element demagnetizes, the sensing element separates from the retaining element, and the sensing element or retaining element is rapidly released under the action of gravity or elastic force, triggering the protection mechanism to complete the over-temperature alarm or linkage power-off protection. The sensing element does not rely on heat conduction paths or electronic calibration, and has high reliability. The over-temperature protection device provided by this invention solves the problem of insufficient reliability of existing over-temperature protection technologies in high-temperature industrial environments.

Description

Technical Field

[0001] This utility model relates to the field of over-temperature protection technology, specifically to an over-temperature protection device. Background Technology

[0002] Over-temperature protection refers to technical measures that protect equipment when its operating temperature exceeds a preset rated value by automatically cutting off the power supply, shutting down the machine, or blowing the circuit. Passive over-temperature alarm devices are applicable to high-temperature industrial equipment such as electric thermal storage boilers, solid thermal storage devices, and molten salt boilers. In these high-temperature industrial systems, preventing equipment overheating is a key means of ensuring operational safety and material lifespan.

[0003] Currently, common over-temperature protection methods mainly include temperature sensors such as thermocouples and thermistors combined with electronic circuit control systems.

[0004] However, these traditional technologies have the following shortcomings when operating in high-temperature environments (especially 500℃~600℃):

[0005] 1. Limited temperature measurement accuracy: The response performance of thermocouples is easily affected by the installation method, heat conduction path and electromagnetic interference, resulting in errors in the actual temperature readings and easy misjudgment;

[0006] 2. Complex system and power supply dependence: Electronic monitoring systems that rely on power supply will directly lose their over-temperature protection capability once the power is cut off or damaged.

[0007] 3. Poor anti-interference ability: High-temperature systems are usually accompanied by strong electromagnetic fields or current pulses, which can easily interfere with electronic temperature control devices.

[0008] 4. Response delay: Temperature sensing relies on conduction paths and electrical signal feedback, which may have a time delay, making it unsuitable for fast-response protection.

[0009] In summary, existing over-temperature protection technologies are unreliable in industrial applications with high temperature and high reliability requirements, and there is an urgent need for a simple, accurate, passive, and highly reliable alternative. Utility Model Content

[0010] Therefore, the technical problem to be solved by this utility model is to overcome the lack of reliability of existing over-temperature protection technology in high-temperature industrial environments, thereby providing an over-temperature protection device.

[0011] To address the aforementioned technical problems, this utility model provides an over-temperature protection device, comprising: a housing, wherein a sensing element, a retaining element, and a protection mechanism are disposed inside the housing; the sensing element is made of a magnetic metal material having a Curie temperature; the protection mechanism cooperates with the retaining element; and the protection mechanism is used for alarm or release tripping mechanism. In normal state, the sensing element is magnetic, and the sensing element and retaining element are magnetically attracted to each other, and the protection mechanism is not triggered; in over-temperature state, the sensing element is demagnetized, the sensing element and retaining element separate, and the protection mechanism is triggered.

[0012] During operation, as the ambient temperature gradually rises, the device remains in normal condition when the temperature is below the Curie point of the sensing element. The sensing element maintains its magnetism, continuously attracting the retainer, and the protection mechanism remains untriggered. When the temperature exceeds the set threshold (i.e., the Curie temperature), the sensing element undergoes a physical "demagnetization" effect, the attraction force rapidly fails, and the sensing element separates from the retainer. The sensing element or retainer is then quickly released under gravity or elastic force, triggering the protection mechanism to complete the over-temperature alarm or power-off protection. The sensing element utilizes the physical phenomenon of magnetic loss at the Curie temperature as a temperature triggering mechanism. Accuracy is determined by the material itself, independent of heat conduction paths or electronic calibration, resulting in high reliability, a simple structure, and low cost. Temperature ranges can be quickly adjusted by replacing different magnetic metal materials, demonstrating high adaptability and scalability. This invention solves the problem of insufficient reliability of existing over-temperature protection technologies in high-temperature industrial environments.

[0013] Optionally, the protection mechanism includes: a power supply, a protection component, and a control component. The protection component and the power supply are electrically connected via a wire, and the control component is mounted on the wire. The sensing element is a magnetic block, and the retaining element is a spring. In normal operation, the magnetic block and the spring are magnetically attracted, the contact point of the magnetic block with the control component separates, and the protection component is disconnected from the power supply. In over-temperature conditions, the magnetic block is demagnetized, separates from the retaining element, and contacts the contact point of the control component, connecting the protection component to the power supply. With this configuration, when the temperature exceeds the Curie temperature of the magnetic material, the magnetic block is demagnetized and separates from the retaining element. Under gravity, the magnetic block triggers the contact point of the control component below, connecting the protection component to the power supply, thus achieving immediate alarm or power-off protection for over-temperature conditions.

[0014] Optionally, the protection component includes a light alarm and / or a tripping mechanism, wherein the light alarm provides a light signal, and the tripping mechanism is used to implement power-off protection. With the above configuration, the light alarm can provide an immediate light signal to indicate excessive temperature, and the tripping mechanism can achieve linked power-off protection. Alternatively, as an alternative implementation, the light alarm can also be configured as an audible and visual alarm.

[0015] Optionally, the power supply is equipped with a fault alarm light, which is connected in parallel with the protection component. With this configuration, the fault alarm light can indicate a power supply fault through a visual signal.

[0016] Optionally, the protection mechanism is configured as a mechanical indicating system with a flip-up indicator mark. The retaining element is configured as a metal connector connected to the indicator mark. In normal operation, the sensing element is attracted to the metal connector, and the indicator mark is hidden. In over-temperature conditions, the sensing element is demagnetized, the metal connector is released by gravity or elastic force, and the indicator mark is exposed. With this configuration, when the ambient temperature exceeds the Curie temperature of the magnetic material, the sensing element is demagnetized, and the metal connector is automatically released under gravity or elastic force, driving the indicator mark to flip and reveal a preset color or mark. This achieves a passive, visual alarm prompt, suitable for physical status indication in low-power scenarios, independent of power supply, and applicable to safety assurance in environments with severe electromagnetic interference, high risk of power outage, or extreme conditions.

[0017] Optionally, the protection mechanism is configured as a sound plate, and the sensing element is configured as a magnetic spring. The magnetic spring has an elastic force that moves towards the sound plate. In normal conditions, the magnetic spring is attracted to the retaining member. In over-temperature conditions, the magnetic spring is demagnetized, and under the action of the elastic force, it strikes the sound plate. With the above configuration, when the ambient temperature exceeds the Curie temperature of the magnetic material, the magnetic spring is demagnetized and falls off. Driven by the elastic force, the magnetic spring strikes the sound plate, emitting a clear sound, realizing an acoustic alarm under power-free conditions. It has the advantages of simple structure and rapid response, and is suitable for temperature control locations where power supply is unavailable.

[0018] Optionally, the housing contains multiple sensing elements with different Curie temperatures. Each sensing element has a corresponding retaining element and a protective mechanism. Through this arrangement, sensing elements made of magnetic materials with different Curie temperatures are distributed in a specific order across multiple temperature-sensitive areas within the housing. Each sensing element is equipped with an independent retaining element and a protective mechanism. As the temperature gradually increases, the different sensing elements demagnetize sequentially, thereby achieving multi-level temperature alarm output and graded response functions, improving the system's alarm accuracy and multi-layered safety protection capabilities. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of one embodiment of the over-temperature protection device provided in this utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Sensing element; 2. Holding element; 3. Power supply; 4. Light alarm; 5. Tripping mechanism; 6. Control element; 7. Fault alarm light. Detailed Implementation

[0023] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0027] Example 1

[0028] This embodiment provides a structure for an over-temperature protection device that meets the reliability requirements of high-temperature applications, used for over-temperature protection of the device.

[0029] like Figure 1 The diagram illustrates a specific implementation of an over-temperature protection device provided in this embodiment. It includes a housing, inside which are disposed a sensing element 1, a retaining member 2, and a protection mechanism. The sensing element 1 is made of a magnetic metal material with a Curie temperature. The protection mechanism cooperates with either the sensing element 1 or the retaining member 2. The protection mechanism is used to alarm or release a tripping mechanism 5. In a normal state, the sensing element 1 is magnetic, and the sensing element 1 and the retaining member 2 are magnetically attracted to each other, and the protection mechanism is not triggered. In an over-temperature state, the sensing element 1 is demagnetized, the sensing element 1 and the retaining member 2 separate, and the protection mechanism is triggered.

[0030] During operation, as the ambient temperature gradually increases, the device remains in normal condition when the temperature is below the Curie temperature of the sensing element 1. The sensing element 1 maintains its magnetism and continues to attract the retaining member 2, and the protection mechanism is not triggered. When the temperature exceeds a set threshold (i.e., the Curie temperature), the sensing element 1 undergoes a physical "demagnetization" effect, the attraction force rapidly fails, and the sensing element 1 separates from the retaining member 2. The sensing element 1 or the retaining member 2 is then rapidly released under gravity or elastic force, triggering the protection mechanism to complete the over-temperature alarm or power-off protection. The sensing element 1 utilizes the physical phenomenon of magnetic loss at the Curie temperature as a temperature triggering mechanism. Accuracy is determined by the material itself, without relying on heat conduction paths or electronic calibration, resulting in high reliability, a simple structure, and low cost. Temperature range changes can be quickly achieved by replacing different magnetic metal materials, demonstrating high adaptability and scalability. The over-temperature protection device provided in this embodiment solves the problem of insufficient reliability of existing over-temperature protection technologies in high-temperature industrial environments.

[0031] Specifically, the sensing element 1 is made of iron-nickel alloy, iron-manganese alloy, or iron-silicon magnetic material with a preset Curie temperature.

[0032] Specifically, the housing is used to integrate the over-temperature protection device provided in this embodiment and is adapted to the surface, inner cavity, or periphery of a safety valve of a boiler, thermal storage equipment, or other equipment.

[0033] Specifically, the protection mechanism can trigger any of the following forms of alarm or signal output devices: mechanical contact closing or opening (forming a signal circuit); impact sound-generating mechanism (generating a sound); push indicator (visual indication); release power-off trip unit (which can be connected to a safety relay or other device).

[0034] like Figure 1 As shown, in the over-temperature protection device provided in this embodiment, the protection mechanism includes: a power supply 3, a protection component, and a control component 6. The protection component and the power supply 3 are electrically connected by a wire, and the control component 6 is disposed on the wire. The sensing element 1 is a magnetic block, and the retaining member 2 is a spring. In the normal state, the magnetic block and the spring are magnetically attracted, the contact point of the magnetic block with the control component 6 is separated, and the protection component is disconnected from the power supply 3. In the over-temperature state, the magnetic block is demagnetized and separates from the retaining member 2, the contact point of the magnetic block with the control component 6 is made contact, and the protection component is connected to the power supply 3. When the temperature exceeds the Curie temperature of the magnetic material, the magnetic block is demagnetized and separates from the retaining member 2. Under the action of gravity, the magnetic block triggers the contact point of the control component 6 below, protecting the alarm device and the power supply 3, realizing immediate alarm or linkage power-off protection for over-temperature. Specifically, the retaining member 2 is fixedly disposed on the housing. Alternatively, as an alternative implementation, the sensing element 1 is fixedly mounted on the housing, and the retaining member 2 is made of metal. In an overheating state, the retaining member 2 detaches from the sensing element 1 and contacts the contact point of the control member 6, thereby making the circuit conductive.

[0035] Specifically, the sensing element 1 is configured as a neodymium steel column with a cylindrical structure.

[0036] like Figure 1 As shown, in the over-temperature protection device provided in this embodiment, the protection components include: a light alarm 4 and / or a tripping mechanism 5. The light alarm 4 provides a light signal, and the tripping mechanism 5 is used to implement power-off protection. The light alarm 4 can provide an immediate light signal to indicate that the temperature has exceeded the limit, and the tripping mechanism 5 can implement linked power-off protection.

[0037] Specifically, the tripping mechanism 5 is configured as an inductive circuit tripping device.

[0038] like Figure 1 As shown, in the over-temperature protection device provided in this embodiment, a fault alarm light 7 is provided on the power supply 3, and the fault alarm light 7 is connected in parallel with the protection component. The fault alarm light 7 can indicate a fault in the power supply 3 through a light signal.

[0039] How to use:

[0040] like Figure 1As shown, the over-temperature protection device provided in this embodiment, when the device is running, the ambient temperature gradually increases. When the temperature is lower than the Curie temperature of the sensing element 1, it is in normal condition. The sensing element 1 inside the device maintains its magnetism and continues to attract the holding member 2, and the protection mechanism is not triggered. When the temperature exceeds the set threshold (i.e., the Curie temperature), the sensing element 1 undergoes a physical "demagnetization" effect, the attraction force quickly fails, the sensing element 1 separates from the holding member 2, and the sensing element 1 or the holding member 2 is quickly released under the action of gravity or elastic force, triggering the protection mechanism to complete the over-temperature alarm or linkage power-off protection.

[0041] Example 2

[0042] The over-temperature protection device provided in this embodiment has a structure that is largely the same as that in Embodiment 1, with the following differences:

[0043] The protective mechanism is configured as a mechanical indicating system, which has a flip-up indicator mark. The retaining member 2 is configured as a metal connector, which is connected to the indicator mark. In the normal state, the sensing element 1 is attracted to the metal connector, and the indicator mark is hidden. In the over-temperature state, the sensing element 1 is demagnetized, the metal connector is released by gravity or elastic force, and the indicator mark is exposed.

[0044] When the ambient temperature exceeds the Curie temperature of the magnetic material, the sensing element 1 is demagnetized, and the metal connector is automatically released under the action of gravity or elastic force, driving the indicator mark to flip and reveal a preset color or mark, realizing a passive visual alarm prompt. It is suitable for physical status indication in low power consumption scenarios, does not rely on power supply 3, and is suitable for safety protection in environments with severe electromagnetic interference, high risk of power failure, or extreme environments.

[0045] Example 3

[0046] The over-temperature protection device provided in this embodiment has a structure that is largely the same as that in Embodiment 1, with the following differences:

[0047] The protection mechanism is configured as a sound plate, and the sensing element 1 is configured as a magnetic spring. The magnetic spring has an elastic force that moves toward the sound plate. In the normal state, the magnetic spring is attracted to the retaining member 2. In the over-temperature state, the magnetic spring is demagnetized and strikes the sound plate under the action of the elastic force.

[0048] When the ambient temperature exceeds the Curie temperature of the magnetic material, the magnetic spring is demagnetized and falls off. Driven by elastic force, the magnetic spring strikes the sound plate, emitting a clear sound, realizing an acoustic alarm under the condition of no power supply. It has the advantages of simple structure and fast response, and is suitable for temperature control places where power supply is unavailable.

[0049] Example 4

[0050] The over-temperature protection device provided in this embodiment has a structure that is largely the same as that in Embodiment 1, with the following differences:

[0051] The housing contains a plurality of sensing elements 1, each sensing element 1 having a different Curie temperature value, and each sensing element 1 having a retaining member 2 and a protective mechanism that cooperate with it.

[0052] The sensing elements 1, made of magnetic materials with different Curie temperatures, are distributed in a specific order in multiple temperature-sensitive areas within the housing. Each sensing element 1 is equipped with an independent retaining element 2 and a protection mechanism. As the temperature gradually increases, the different sensing elements 1 lose magnetism in sequence, thereby realizing multi-level temperature alarm output and graded response functions, improving the alarm accuracy and multi-layered security capabilities of the system.

[0053] For example, the first stage triggers a buzzer to indicate the problem, the second stage is power failure protection, and the third stage is mechanical linkage to force the equipment to shut down.

[0054] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this utility model.

Claims

1. An over-temperature protection device, characterized in that, include: The housing contains a sensing element (1), a retaining member (2), and a protection mechanism. The sensing element (1) is made of a magnetic metal material with a Curie temperature. The protection mechanism cooperates with the sensing element (1) or the retaining member (2) and is used to alarm or release the tripping mechanism (5). In the normal state, the sensing element (1) is magnetic, and the sensing element (1) and the retaining member (2) are magnetically attracted to each other, and the protection mechanism is not triggered; in the over-temperature state, the sensing element (1) is demagnetized, the sensing element (1) and the retaining member (2) are separated, and the protection mechanism is triggered.

2. The over-temperature protection device according to claim 1, characterized in that, The protection mechanism includes: a power supply (3), a protection component and a control component (6), wherein the protection component and the power supply (3) are electrically connected by a wire, and the control component (6) is provided on the wire; The sensing element (1) is a magnetic block, and the retaining member (2) is a spring. In normal state, the magnetic block and the spring are magnetically attracted, the contact point of the magnetic block with the control member (6) is separated, and the protection component is disconnected from the power supply (3). In over-temperature state, the magnetic block is demagnetized and separated from the retaining member (2). The contact point of the magnetic block with the control member (6) is in contact, and the protection component is connected to the power supply (3).

3. The over-temperature protection device according to claim 2, characterized in that, The protection components include: a light alarm (4) and / or a tripping mechanism (5), wherein the light alarm (4) provides a light signal and the tripping mechanism (5) is used to implement power failure protection.

4. The over-temperature protection device according to claim 3, characterized in that, The power supply (3) is equipped with a fault alarm light (7), which is connected in parallel with the protection component.

5. The over-temperature protection device according to claim 1, characterized in that, The protective mechanism is configured as a mechanical indicating system, which has a flip-up indicating mark. The retainer (2) is configured as a metal connector, which is connected to the indicating mark. In the normal state, the sensing element (1) adsorbs the metal connector, and the indicating mark is hidden. In the over-temperature state, the sensing element (1) is demagnetized, the metal connector is released by gravity or elastic force, and the indicating mark is exposed.

6. The over-temperature protection device according to claim 1, characterized in that, The protection mechanism is configured as a sound plate, and the sensing element (1) is configured as a magnetic spring. The magnetic spring has an elastic force that moves toward the sound plate. In the normal state, the magnetic spring is adsorbed on the retaining member (2). In the over-temperature state, the magnetic spring is demagnetized, and the magnetic spring impacts the sound plate under the action of the elastic force.

7. The over-temperature protection device according to any one of claims 1-6, characterized in that, The housing contains a plurality of sensing elements (1), each sensing element (1) having a different Curie temperature value, and each sensing element (1) having a retainer (2) and a protective mechanism that cooperate with it.

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