A temperature limiter with magnetic blowing and multiple protections

Abstract

The present invention relates to the technical field of temperature limiters, in particular to a temperature limiter with magnetic blowing and multiple protections, which is provided with at least one power-on circuit, each power-on circuit is provided with at least two contact groups, each contact group is provided with a power-off mechanism and a magnetic blowing mechanism, the contact group is movably connected with the corresponding power-off mechanism, the power-off mechanism is used to disconnect the contact group when the sensed temperature exceeds a preset temperature; the contact group is penetrated by the magnetic field formed by the corresponding magnetic blowing mechanism; the magnetic blowing mechanism is provided with an arc absorbing part, the arc absorbing part surrounds the outer periphery of the corresponding contact group, and the magnetic blowing mechanism is used to magnetically blow and draw the arc to the arc absorbing part when the contact group is disconnected and an arc is generated; the problem of the risk of failure of the temperature limiter and the problem of arc damage caused by the lack of a perfect arc extinguishing function are solved.

Description

Technical Field

[0001] The invention relates to the technical field of temperature limiters, in particular to a temperature limiter with magnetic blowing and multiple protections. Background Art

[0002] In the field of safety protection of electrical equipment, the temperature limiter, as a key component, bears the important responsibility of preventing circuit failures and protecting electrical equipment and personal safety.

[0003] Traditional temperature limiters usually use only one set of contacts for one power-on circuit, and this design has significant limitations. Specifically, the core component of the temperature limiter, the temperature sensor, is prone to problems. For example, when the temperature sensor is damaged due to aging, impact or other external factors, or when the temperature sensing medium inside the temperature sensor leaks, the temperature sensing medium inside the temperature sensor expands and cannot cause the temperature sensor to deform and push the contacts to disconnect. The temperature limiter will therefore fail and cannot normally trigger the power-off protection mechanism, which in turn makes the safety of electrical equipment unprotected.

[0004] In addition, when traditional temperature limiters are used in high-current electrical equipment, they will face another challenge: the lack of efficient arc extinguishing capability. When the temperature limiter performs a power-off operation, especially when handling high-current loads, a strong arc discharge phenomenon will occur at the moment of contact separation; the arc will not only generate high temperatures, but may also cause thermal damage or even combustion of surrounding materials, posing a direct threat to other components inside the temperature limiter; and the conventional arc extinguishing measure is to place a magnet or electromagnet next to the contact for magnetic arc blowing, but magnetic arc blowing cannot completely solve the impact of high-temperature arcs on the temperature limiter because the arc will also hit the components in the arc drawing direction during the arc drawing process. This not only increases the cost of equipment maintenance, but also reduces the reliability and safety of electrical equipment.

[0005] In summary, traditional temperature limiters have obvious technical shortcomings in their design, especially in terms of the risk of temperature limiter failure after the temperature sensing package is damaged and the arc damage caused by the lack of a perfect arc extinguishing function. A solution is urgently needed to improve the comprehensive performance of the temperature limiter and ensure that it provides stable and reliable power-off protection in a complex and changeable power consumption environment. Summary of the invention

[0006] In view of the above-mentioned defects, the purpose of the present invention is to propose a temperature limiter with magnetic blowout and multiple protections, which solves the problem of temperature limiter failure risk and the problem of arc damage caused by the lack of a perfect arc extinguishing function.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] A temperature limiter with magnetic blowout and multiple protections, provided with at least one power-on circuit, each of which is provided with at least two contact groups, each of which is provided with a power-off mechanism and a magnetic blowout mechanism, the contact group is movably connected with the corresponding power-off mechanism, the power-off mechanism is used to disconnect the contact group when the sensed temperature exceeds a preset temperature; the contact group is arranged in the magnetic field formed by the corresponding magnetic blowout mechanism;

[0009] The magnetic blowing mechanism is provided with an arc absorbing portion, which surrounds the outer circumference of the corresponding contact group. The magnetic blowing mechanism is used for magnetically blowing and drawing the arc to the arc absorbing portion when the contact group is disconnected and an arc is generated.

[0010] Further, it comprises at least two temperature-limiting sub-components, the left and right parts of the temperature-limiting sub-components are respectively provided with electronic circuits, each of the electronic circuits is provided with one contact group, the power-off mechanism is arranged on the top of the temperature-limiting sub-component, and the action end of the power-off mechanism is simultaneously connected to the activities of the two contact groups of the temperature-limiting sub-components;

[0011] The rear end of the electronic circuit on the left of the previous temperature-limiting sub-device is electrically connected to the front end of the electronic circuit on the left of the next temperature-limiting sub-device, and the rear end of the electronic circuit on the right of the previous temperature-limiting sub-device is electrically connected to the front end of the electronic circuit on the right of the next temperature-limiting sub-device, forming two power circuits;

[0012] The magnetic blowing mechanism includes an upper magnetic blowing assembly and a lower magnetic blowing assembly; the upper magnetic blowing assembly is inserted from the upper part of the temperature limiting sub-component, and the lower magnetic blowing assembly is inserted from the lower part of the temperature limiting sub-component, and the upper magnetic blowing assembly and the lower magnetic blowing assembly are interlocked with each other, one above and one below, to cover the corresponding contact group.

[0013] Furthermore, the electronic circuit includes a front contact, an elastic contact and a rear contact, and the housing of the temperature-limiting sub-component includes an upper housing and a lower housing; the action end of the power-off mechanism is fixedly connected to the elastic contact, and the elastic contact is elastically connected to the top surface of the bottom of the groove of the lower housing;

[0014] The front end of the front contact is used as the front end of the electronic circuit, the bottom surface of the rear end of the front contact is against the top surface of the front end of the elastic contact, the bottom surface of the front end of the rear contact is against the top surface of the rear end of the elastic contact, and the rear end of the rear contact is used as the rear end of the electronic circuit to form the contact group;

[0015] When the power-off mechanism senses that the temperature exceeds a preset temperature, the action end of the power-off mechanism moves downward;

[0016] The upper shell body respectively corresponds to the front end and the rear end of the elastic contact to form an upper plug-in interface, and the lower shell body respectively corresponds to the front end and the rear end of the elastic contact to form a lower plug-in interface; the upper magnetic blow assembly is inserted into the upper plug-in interface from top to bottom, and the lower magnetic blow assembly is inserted into the lower plug-in interface from bottom to top, and the bottom surface of the upper magnetic blow assembly and the top surface of the lower magnetic blow assembly enclose and cover the rear end of the front contact and the front end of the elastic contact, or enclose and cover the front end of the rear contact and the rear end of the elastic contact;

[0017] The bottom surface of the upper magnetic blowing assembly and the top surface of the lower magnetic blowing assembly are both used as the arc absorbing portion, and a magnetic field is formed between the bottom surface of the upper magnetic blowing assembly and the top surface of the lower magnetic blowing assembly.

[0018] Furthermore, the upper magnetic blowing assembly and the lower magnetic blowing assembly have the same structure;

[0019] The upper magnetic blowing assembly comprises a receiving groove, a magnet and a limiting cover; the center of the bottom surface of the receiving groove is recessed upward to form a bottom surface recessed position, and the bottom surface recessed position is used as the arc absorbing portion. The magnet is placed in the receiving groove, and the bottom surface of the magnet is in contact with the bottom surface of the receiving groove;

[0020] The groove body of the accommodating groove is inserted into the upper plug interface, the recessed position of the bottom surface corresponds to the rear end of the front contact or the front end of the rear contact, the bottom of the limit cover is inserted into the accommodating groove and abuts against the top surface of the magnet, the top of the limit cover is detachably installed on the upper plug interface, and the top of the limit cover and the upper plug interface clamp and fix the notch end of the accommodating groove.

[0021] Furthermore, the bottom surface recessed position is an independent component, and the bottom surface recessed position can be detachably installed on the bottom surface of the accommodating groove, and the bottom surface recessed position is made of ceramic material.

[0022] Furthermore, when the magnet is replaced by an electromagnet, an electric control unit is provided on the top of the limit cover, the electric control unit is electrically connected to the electromagnet, and the electric control unit and the power-off mechanism are controlled in linkage.

[0023] Furthermore, the front contact, the elastic contact and the rear contact are all made of non-magnetic conductive materials.

[0024] Furthermore, the power-off mechanism includes a power-off temperature-sensing package, a temperature-sensitive capillary and an actuating rod; the power-off temperature-sensing package is arranged on the top of the upper shell, one end of the temperature-sensitive capillary is connected to the interior of the power-off temperature-sensing package, and the other end of the temperature-sensitive capillary extends outside the upper shell and is arranged at the target temperature-sensing position of the equipment where the temperature limiter is installed, the deformable bottom surface of the power-off temperature-sensing package is abutted against the top end of the actuating rod, and the bottom end of the actuating rod is fixedly connected to the elastic contact.

[0025] Furthermore, the electric control unit includes an electric control board, a linked temperature sensing capillary and an electric control unit cover, and a linked temperature sensing package is provided inside the cover of the electric control unit cover;

[0026] The electric control board is fixed on the top of the limit cover, the electric control part cover is arranged on the top of the limit cover and covers the electric control board, the deformable part of the linkage temperature sensing package is located above the magnetic field generating button of the electric control board, one end of the linkage temperature sensing capillary is connected to the interior of the linkage temperature sensing package, and the other end of the linkage temperature sensing capillary is connected to the temperature sensing component of the power-off mechanism.

[0027] Furthermore, a sealing member is clamped between the upper plug interface and the notch end of the accommodating groove.

[0028] The technical solution provided by the present invention may include the following beneficial effects: at least one power-on circuit is provided in the temperature limiter, each power-on circuit is provided with at least two contact groups, each contact group is provided with a power-off mechanism and a magnetic blowing mechanism, the contact group is movably connected to the corresponding power-off mechanism, so that when the power-off mechanism senses that the temperature exceeds the preset temperature, it can movably disconnect the connection of the contact group, then one contact group is a layer of protection, and thus, because each power-on circuit is provided with at least two contact groups, multiple protections are formed, even if the power-off mechanism of one of the contact groups fails and the connection of the contact group cannot be disconnected, other contact groups can be used to disconnect and realize temperature limit protection.

[0029] On this basis, in order to prevent the high-temperature arc from damaging other components inside the temperature limiter during the disconnection process of the contact group, a magnetic blowing mechanism is provided on the periphery of each contact group. Specifically, the contact groups are respectively penetrated by the magnetic field formed by the corresponding magnetic blowing mechanism, so that the magnetic field generated by the magnetic blowing mechanism fully covers the contacts. When an arc is generated, the magnetic field can magnetically blow out the arc (that is, the arc is subjected to the Lorentz force), and no matter how the arc is generated between the contacts of the contact group, where the arc is drawn (that is, no matter where the direction of the Lorentz force is pointing), the arc will be magnetically blown to the arc absorption part covering the periphery of the contact group, and the arc will be quickly absorbed by the arc absorption part to achieve the purpose of complete arc extinguishing, thereby reducing the cost of equipment maintenance and improving the reliability and safety of electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a partial structural schematic diagram of a temperature limiter with magnetic blowout and multiple protections according to one embodiment of the present invention.

[0031] Figure 2 It is a partial assembly diagram of a temperature limiter with magnetic blowout and multiple protections according to one embodiment of the present invention.

[0032] Figure 3 Yes Figure 2The figure shows a schematic diagram of the structure of a temperature limiter with magnetic blowout and multiple protections.

[0033] Figure 4 Yes Figure 2 Enlarged view of point A in the middle.

[0034] Figure 5 Yes Figure 2 The structural schematic diagram of the receiving tank is shown.

[0035] Figure 6 Yes Figure 2 The structural schematic diagram of the limit cover is shown.

[0036] Among them: power-on circuit 1, contact group 2, power-off mechanism 3, magnetic blowing mechanism 4, temperature limiting sub-component 5, power-on electronic circuit 51, upper magnetic blowing assembly 41, lower magnetic blowing assembly 42, front contact 21, elastic contact 22, rear contact 23, upper shell 52, lower shell 53, accommodating groove 411, magnet 412, limit cover 413, bottom recessed position 414, electric control part 415, power-off temperature sensing package 31, temperature sensing capillary 32, action rod 33, electric control board 4151, linked temperature sensing capillary 4152, electric control part cover 4153, linked temperature sensing package 4154. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying 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 a limitation on the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of the features, and are used to distinguish and describe features, without distinction of order or importance.

[0039] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0040] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0041] Combine the following Figures 1 to 6 , describing a temperature limiter with magnetic blowout and multiple protections according to an embodiment of the present invention.

[0042] A temperature limiter with magnetic blowing and multiple protections, provided with at least one power-on circuit 1, each power-on circuit 1 is provided with at least two contact groups 2, each contact group 2 is provided with a power-off mechanism 3 and a magnetic blowing mechanism 4, the contact group 2 is movably connected with the corresponding power-off mechanism 3, the power-off mechanism 3 is used to disconnect the contact group 2 when the sensed temperature exceeds a preset temperature; the contact group 2 is arranged to pass through the magnetic field formed by the corresponding magnetic blowing mechanism 4;

[0043] The magnetic blowing mechanism 4 is provided with an arc absorbing portion, which surrounds the outer periphery of the corresponding contact group 2. The magnetic blowing mechanism 4 is used for magnetically blowing and drawing the arc to the arc absorbing portion when the contact group 2 is disconnected and an arc is generated.

[0044] The present invention proposes a preferred embodiment of a temperature limiter with magnetic blowout and multiple protections, such as Figures 1 to 3 As shown, at least one power-on circuit 1 is provided in the temperature limiter, each power-on circuit 1 is provided with at least two contact groups 2, each contact group 2 is provided with a power-off mechanism 3 and a magnetic blowing mechanism 4, and the contact group 2 is movably connected to the corresponding power-off mechanism 3, so that when the power-off mechanism 3 senses that the temperature exceeds the preset temperature, it can movably disconnect the connection of the contact group 2, and then one contact group 2 is a layer of protection. Therefore, since each power-on circuit 1 is provided with at least two contact groups 2, multiple protections are formed. Even if the power-off mechanism 3 of one of the contact groups 2 fails and the connection of the contact group 2 cannot be disconnected, other contact groups 2 can be used to disconnect and realize temperature limit protection.

[0045] On this basis, in order to prevent the high-temperature arc from damaging other components inside the temperature limiter during the disconnection process of the contact group 2, a magnetic blowing mechanism 4 is provided on the periphery of each contact group 2. Specifically, the contact groups 2 are respectively penetrated by the magnetic field formed by the corresponding magnetic blowing mechanism 4, so that the magnetic field generated by the magnetic blowing mechanism 4 fully covers the contacts. When an arc is generated, the magnetic field can magnetically blow out the arc (that is, the arc is subjected to the Lorentz force), and no matter how the arc is generated between the contacts of the contact group 2, where the arc is drawn (that is, no matter where the direction of the Lorentz force is pointing), the arc will be magnetically blown to the arc absorbing part covering the periphery of the contact group 2, and the arc will be quickly absorbed by the arc absorbing part to achieve the purpose of complete arc extinguishing, thereby reducing the cost of equipment maintenance and improving the reliability and safety of electrical equipment.

[0046] Further, at least two temperature-limiting sub-components 5 are included, and the left and right parts of the temperature-limiting sub-components 5 are respectively provided with electronic circuits 51, each electronic circuit 51 is provided with a contact group 2, and a power-off mechanism 3 is arranged on the top of the temperature-limiting sub-component 5, and the action end of the power-off mechanism 3 is simultaneously connected to the activities of the two contact groups 2 of the temperature-limiting sub-component 5;

[0047] The rear end of the left electronic circuit 51 of the previous temperature-limiting sub-component 5 is electrically connected to the front end of the left electronic circuit 51 of the next temperature-limiting sub-component 5, and the rear end of the right electronic circuit 51 of the previous temperature-limiting sub-component 5 is electrically connected to the front end of the right electronic circuit 51 of the next temperature-limiting sub-component 5, forming two power-on circuits 1;

[0048] The magnetic blowing mechanism 4 includes an upper magnetic blowing assembly 41 and a lower magnetic blowing assembly 42; the upper magnetic blowing assembly 41 is inserted from the upper part of the temperature limiting sub-component 5, and the lower magnetic blowing assembly 42 is inserted from the lower part of the temperature limiting sub-component 5, and the upper magnetic blowing assembly 41 and the lower magnetic blowing assembly 42 are interlocked with each other, one above and one below, to cover the corresponding contact group 2.

[0049] In this embodiment, in order to improve the flexibility of multiple protections of the temperature limiter, the temperature limiter is preferably composed of multiple temperature limiting sub-components 5, each temperature limiting sub-component 5 can be used separately, and has an independent electronic circuit 51, a contact group 2 and a power-off mechanism 3. The electronic circuits 51 of multiple temperature limiting sub-components 5 are connected in series to obtain a power circuit 1. A multi-lead terminal can be connected to the front end of the electronic circuit 51 of the frontmost temperature limiting sub-component 5 or the rear end of the electronic circuit 51 of the rearmost temperature limiting sub-component 5, so that multiple electrical equipment can share one temperature limiter, or multiple power circuits in electrical equipment can share one temperature limiter, thereby reducing the cost of temperature limit protection.

[0050] Based on the electronic circuit 51 of the temperature limiting sub-device 5 and the position of the contact group 2, the magnetic blowing mechanism 4 is plugged in from the upper left and lower left parts of the temperature limiting sub-device 5, or the magnetic blowing mechanism 4 is plugged in from the upper right and lower right parts of the temperature limiting sub-device 5, and covers the contact group 2.

[0051] Furthermore, the electronic circuit 51 includes a front contact 21, an elastic contact 22 and a rear contact 23, and the housing of the temperature-limiting sub-component 5 includes an upper housing 52 and a lower housing 53; the action end of the power-off mechanism 3 is fixedly connected to the elastic contact 22, and the elastic contact 22 is elastically connected to the top surface of the bottom of the groove of the lower housing 53;

[0052] The front end of the front contact 21 is used as the front end of the electronic circuit, the bottom surface of the rear end of the front contact 21 abuts against the top surface of the front end of the elastic contact 22, the bottom surface of the front end of the rear contact 23 abuts against the top surface of the rear end of the elastic contact 22, and the rear end of the rear contact 23 is used as the rear end of the electronic circuit to form a contact group 2;

[0053] When the power-off mechanism 3 senses that the temperature exceeds the preset temperature, the action end of the power-off mechanism 3 moves downward;

[0054] The upper shell 52 respectively corresponds to the front end and the rear end of the elastic contact 22 to open an upper plug interface 521, and the lower shell 53 respectively corresponds to the front end and the rear end of the elastic contact 22 to open a lower plug interface 531; the upper magnetic blow assembly 41 is inserted into the upper plug interface 521 from top to bottom, and the lower magnetic blow assembly 42 is inserted into the lower plug interface 531 from bottom to top, and the bottom surface of the upper magnetic blow assembly 41 and the top surface of the lower magnetic blow assembly 42 surround and cover the rear end of the front contact 21 and the front end of the elastic contact 22, or surround and cover the front end of the rear contact 23 and the rear end of the elastic contact 22;

[0055] The bottom surface of the upper magnetic blowing assembly 41 and the top surface of the lower magnetic blowing assembly 42 are both used as arc absorbing parts, and a magnetic field is formed between the bottom surface of the upper magnetic blowing assembly 41 and the top surface of the lower magnetic blowing assembly 42 .

[0056] In this embodiment, in the temperature limiting sub-component 5, the electronic circuit 51 is composed of a front contact 21, an elastic contact 22 and a rear contact 23. The action end of the power-off mechanism 3 is fixedly connected to the elastic contact 22. The elastic contact 22 is elastically connected (such as by setting a spring) to the top surface of the bottom of the groove of the lower shell 53, so that under the elastic action of the elastic contact 22, the top surface of the front end and the top surface of the rear end of the elastic contact 22 respectively abut against the bottom surface of the rear end of the front contact 21 and the bottom surface of the front end of the rear contact 23 (forming a contact group 2). Only when the power-off mechanism 3 senses that the temperature exceeds the preset temperature and moves the action end of the power-off mechanism 3 downward, the elastic contact 22 will be disconnected from the front contact 21 and the rear contact 23 at the same time (that is, the contact group 2 is disconnected).

[0057] Based on the structure of the contact group 2, the magnetic blowing mechanism 4 is composed of an upper magnetic blowing assembly 41 and a lower magnetic blowing assembly 42. An upper plug-in interface 521 is provided on the upper shell 52 corresponding to the front end and the rear end of the elastic contact 22, and a lower plug-in interface 531 is provided on the lower shell 53 corresponding to the front end and the rear end of the elastic contact 22. The upper magnetic blowing assembly 41 and the lower magnetic blowing assembly 42 are respectively inserted into the upper plug-in interface 521 and the lower plug-in interface 531, so that the bottom surface of the upper magnetic blowing assembly 41 and the top surface of the lower magnetic blowing assembly 42 surround and cover the rear end of the front contact 21 and the front end of the elastic contact 22. Or it surrounds and covers the front end of the rear contact 23 and the rear end of the elastic contact 22, thereby forming a magnetic field between the bottom surface of the upper magnetic blowing assembly 41 and the top surface of the lower magnetic blowing assembly 42, and arcing (using the Lorentz force) the high-temperature arc generated when the rear end of the front contact 21 and the front end of the elastic contact 22, or the front end of the rear contact 23 and the rear end of the elastic contact 22 are disconnected, so that the arc hits the bottom surface of the upper magnetic blowing assembly 41 or the top surface of the lower magnetic blowing assembly 42 to quickly consume the arc energy, thereby achieving the purpose of arc extinguishing, and also preventing the arc from hitting other components inside the temperature limiter.

[0058] Furthermore, the upper magnetic blowing assembly 41 and the lower magnetic blowing assembly 42 have the same structure;

[0059] The upper magnetic blowing assembly 41 includes a receiving groove 411, a magnet 412 and a limiting cover 413; the center of the bottom surface of the receiving groove 411 is recessed upward to form a bottom surface recessed position 414, and the bottom surface recessed position 414 is used as an arc absorbing portion. The magnet 412 is placed in the receiving groove 411, and the bottom surface of the magnet 412 is in contact with the bottom surface of the receiving groove 411;

[0060] The groove body of the accommodating groove 411 is inserted into the upper plug-in interface 521, and the bottom recessed position 414 corresponds to the rear end of the front contact 21 or the front end of the rear contact 23. The bottom of the limiting cover 413 is inserted into the accommodating groove 411 and abuts against the top surface of the magnet 412. The top of the limiting cover 413 is detachably installed on the upper plug-in interface 521, and the top of the limiting cover 413 and the upper plug-in interface 521 clamp and fix the notch end of the accommodating groove 411.

[0061] In this embodiment, Figure 4As shown, in order to enable the upper magnetic blowing assembly 41 and the lower magnetic blowing assembly 42 to smoothly enclose and cover the contact group 2 and form a stable magnetic field, the two have the same structure; wherein the upper magnetic blowing assembly 41 is taken as an example, it is composed of a receiving groove 411, a magnet 412 and a limiting cover 413, and the bottom surface center of the receiving groove 411 is recessed upward to form a bottom surface recessed position 414 for the upper magnetic blowing assembly 41 and the lower magnetic blowing assembly 42 to abut against each other, and the bottom surface recessed positions 414 of the two can enclose and cover the rear end of the front contact 21 and the front end of the elastic contact 22 or the front end of the rear contact 23 and the rear end of the elastic contact 22, and then the magnet 412 is placed In the receiving groove 411, the bottom surface of the magnet 412 fits into the bottom surface of the receiving groove 411, and the magnets 412 in the receiving grooves 411 of the upper magnetic blowing assembly 41 and the lower magnetic blowing assembly 42 attract each other to form a magnetic field, thereby covering the rear end of the front contact 21 and the front end contact of the elastic contact 22, or the front end of the rear contact 23 and the rear end contact of the elastic contact 22. In fact, it is the bottom surface recessed position 414 of the receiving groove 411 of the upper magnetic blowing assembly 41 and the bottom surface recessed position 414 of the receiving groove 411 of the lower magnetic blowing assembly 42. Therefore, the bottom surface recessed position 414 is used as an arc absorbing part, which can absorb the arc of magnetic blowing in any direction.

[0062] The installation method of the receiving groove 411 is as follows: first insert the groove body of the receiving groove 411 into the upper plug-in interface 521, and the bottom surface recessed position 414 corresponds to the rear end of the front contact 21 or the front end of the rear contact 23 (the bottom surface recessed position 414 of the lower magnetic blow assembly 42 corresponds to the front end or rear end of the elastic contact 22); then insert the bottom of the limit cover 413 into the receiving groove 411, and abut against the top surface of the magnet 412 to limit the magnet 412; finally, the top of the limit cover 413 is detachably installed on the upper plug-in interface 521, so that the top of the limit cover 413 and the upper plug-in interface 521 clamp the notch end of the fixed receiving groove 411. Based on this installation method of the receiving groove 411, when the bottom surface recessed position 414 is severely damaged by electric arc shock, the receiving groove 411 can be taken out and replaced with a new receiving groove 411.

[0063] Furthermore, the bottom surface recessed position 414 is an independent component, and the bottom surface recessed position 414 can be detachably installed on the bottom surface of the receiving groove 411 , and the bottom surface recessed position 414 is made of ceramic material.

[0064] In this embodiment, Figure 5As shown, in order to reduce the replacement frequency of the receiving groove 411 due to the bottom recessed position 414 being damaged by electric arc, the bottom recessed position 414 is separated from the receiving groove 411 as an independent component (that is, it is no longer integrally formed with the receiving groove 411), and the installation relationship between the bottom recessed position 414 and the bottom surface of the receiving groove 411 is set to be that the bottom recessed position 414 can be detachably installed on the bottom surface of the receiving groove 411 (for example, the bottom recessed position 414 is an arc-shaped plate, and both ends can be connected to the bottom surface of the receiving groove 411 by snapping). If the bottom recessed position 414 is severely damaged, only the bottom recessed position 414 needs to be replaced, and there is no need to replace the entire receiving groove 411, thereby saving loss costs; more importantly, based on the excellent insulation and high temperature resistance of ceramic materials, the bottom recessed position 414 is made of ceramic material, which is not easily damaged by electric arc, thereby greatly extending the service life.

[0065] Furthermore, when the magnet 412 is replaced by an electromagnet, an electric control unit 415 is provided on the top of the limit cover 413 , the electric control unit 415 is electrically connected to the electromagnet, and the electric control unit 415 and the power-off mechanism 3 are controlled in linkage.

[0066] In this embodiment, Figure 6 As shown, the magnet 412 can also be replaced by an electromagnet. In this case, an electric control unit 415 is provided on the top of the limit cover 413. The electric control unit 415 is electrically connected to the electromagnet (for example, the winding wire of the electromagnet passes through the limit cover 413 and the terminal of the electric control unit 415 to be electrically connected). The electric control unit 415 and the power-off mechanism 3 are linked and controlled. When the power-off mechanism 3 senses that the temperature exceeds the preset temperature, the linked electric control unit 415 supplies power to the electromagnet to generate a magnetic field.

[0067] Furthermore, the front contact 21 , the elastic contact 22 and the rear contact 23 are all made of non-magnetic conductive materials.

[0068] In this embodiment, because the contact group 2 is covered by the magnetic field, in order to prevent the contact group 2 from being attracted by the magnetic field, the front contact 21, the elastic contact 22 and the rear contact 23 are preferably all made of non-magnetic conductive materials, such as copper, and an alloy of copper and non-magnetic or weakly magnetic metals.

[0069] Furthermore, the power-off mechanism 3 includes a power-off temperature-sensing package 31, a temperature-sensing capillary 32 and an actuating rod 33; the power-off temperature-sensing package 31 is arranged on the top of the upper shell 52, one end of the temperature-sensing capillary 32 is connected to the interior of the power-off temperature-sensing package 31, and the other end of the temperature-sensing capillary 32 extends out of the upper shell 52 and is arranged at the target temperature-sensing position of the equipment where the temperature limiter is installed, the deformable bottom surface of the power-off temperature-sensing package 31 is abutted against the top of the actuating rod 33, and the bottom end of the actuating rod 33 is fixedly connected to the elastic contact 22.

[0070] In this embodiment, the power-off mechanism 3 is composed of a power-off temperature-sensing package 31, a temperature-sensing capillary 32 and an actuating rod 33. When the temperature-sensing medium in the power-off temperature-sensing package 31 senses through the temperature-sensing capillary 32 that the temperature exceeds the preset temperature, the temperature-sensing medium in the power-off temperature-sensing package 31 expands, causing the bottom surface of the power-off temperature-sensing package 31 to deform, pushing the actuating rod 33 to move downward, thereby separating the elastic contact 22 from the front contact 21 and the rear contact 23 respectively.

[0071] Furthermore, the electric control unit 415 includes an electric control board 4151, a linkage temperature sensing capillary 4152 and an electric control unit cover 4153, and a linkage temperature sensing package 4154 is provided inside the cover of the electric control unit cover 4153;

[0072] The electric control board 4151 is fixed on the top of the limit cover 413, the electric control part cover 4153 is covered on the top of the limit cover 413 and covers the electric control board 4151, the deformable part of the linkage temperature sensing package 4154 is located above the magnetic field generating button of the electric control board 4151, one end of the linkage temperature sensing capillary 4152 is connected to the interior of the linkage temperature sensing package 4154, and the other end of the linkage temperature sensing capillary 4152 is connected to the temperature sensing component of the power-off mechanism 3.

[0073] In this embodiment, when the power-off mechanism 3 senses that the temperature exceeds the preset temperature, the temperature-sensing medium in the linked temperature-sensing package 4154 expands through the linked temperature-sensing capillary 4152, causing the deformable portion of the linked temperature-sensing package 4154 to deform (such as bulging downward), so that the deformable portion continuously presses the magnetic field generating button of the electric control board 4151, thereby energizing the electromagnet to generate a magnetic field, and promptly arcing the contact group 2 that is about to be disconnected.

[0074] It should be noted that, when the temperature-sensing component of the electric control unit 415 is preferably used for the power-off mechanism 3, which is composed of a power-off temperature-sensing package 31 and a temperature-sensing capillary 32, the linked temperature-sensing capillary 4152 is connected to the temperature-sensing capillary 32 (for example, the linked temperature-sensing capillary 4152 passes through the power-off temperature-sensing package 31 and is installed on a mounting bracket on the top of the upper shell 52, and is connected to the temperature-sensing capillary 32 outside the temperature-limiting sub-component 5), which can ensure that the contact group 2 is powered off and the electromagnet is energized to generate a magnetic field at the same time.

[0075] Furthermore, a sealing member 416 is sandwiched between the upper insertion interface 521 and the slot end of the receiving slot 411 .

[0076] In this embodiment, in order to improve the internal sealing of the temperature limiting sub-component 5, a sealing member 416 (such as a non-conductive rubber ring) is clamped between the upper plug interface 521 and the slot end of the accommodating slot 411 to prevent the internal sealing of the temperature limiting sub-component 5 from being affected by the detachable installation of the upper magnetic blowing assembly 41 and the lower magnetic blowing assembly 42.

[0077] Other structures and operations of a temperature limiter with magnetic blowout and multiple protections according to an embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0078] In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0079] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A temperature limiter with magnetic blowout and multiple protections, characterized in that: At least one power-on circuit is provided, each of the power-on circuits is provided with at least two contact groups, each of the contact groups is provided with a power-off mechanism and a magnetic blowing mechanism, the contact groups are movably connected with the corresponding power-off mechanism, the power-off mechanism is used to disconnect the connection of the contact groups when the sensed temperature exceeds a preset temperature; the contact groups are arranged in the magnetic field formed by the corresponding magnetic blowing mechanism; The magnetic blowing mechanism is provided with an arc absorbing portion, which surrounds the outer periphery of the corresponding contact group, and the magnetic blowing mechanism is used for magnetically blowing and drawing the arc to the arc absorbing portion when the contact group is disconnected and an arc is generated; The device comprises at least two temperature-limiting sub-components, wherein the magnetic blowing mechanism comprises an upper magnetic blowing component and a lower magnetic blowing component; the upper magnetic blowing component is inserted from the upper part of the temperature-limiting sub-component, and the lower magnetic blowing component is inserted from the lower part of the temperature-limiting sub-component, and the upper magnetic blowing component and the lower magnetic blowing component are buckled with each other to cover the corresponding contact group; The shell of the temperature limiting sub-device includes an upper shell and a lower shell, and the left and right parts of the temperature limiting sub-device are respectively provided with an electronic circuit, and the electronic circuit includes a front contact, an elastic contact and a rear contact; the upper shell is provided with an upper plug-in interface corresponding to the front end and the rear end of the elastic contact, respectively, and the lower shell is provided with a lower plug-in interface corresponding to the front end and the rear end of the elastic contact, respectively; the upper magnetic blowing component is inserted into the upper plug-in interface from top to bottom, and the lower magnetic blowing component is inserted into the lower plug-in interface from bottom to top, and the bottom surface of the upper magnetic blowing component and the top surface of the lower magnetic blowing component enclose and cover the rear end of the front contact and the front end of the elastic contact, or enclose and cover the front end of the rear contact and the rear end of the elastic contact; the bottom surface of the upper magnetic blowing component and the top surface of the lower magnetic blowing component are both used as the arc absorbing part, and a magnetic field is formed between the bottom surface of the upper magnetic blowing component and the top surface of the lower magnetic blowing component; The upper magnetic blowing assembly and the lower magnetic blowing assembly have the same structure; the upper magnetic blowing assembly includes a receiving groove, a magnet and a limit cover; the center of the bottom surface of the receiving groove is recessed upward to form a bottom surface recessed position, and the bottom surface recessed position is used as the arc absorbing portion, and the magnet is placed in the receiving groove, and the bottom surface of the magnet fits the bottom surface of the receiving groove; the groove body of the receiving groove is inserted into the upper plug-in interface, and the bottom surface recessed position corresponds to the rear end of the front contact or the front end of the rear contact, and the bottom of the limit cover is inserted into the receiving groove and abuts against the top surface of the magnet, and the top of the limit cover is detachably mounted on the upper plug-in interface, and the top of the limit cover and the upper plug-in interface clamp and fix the notch end of the receiving groove.

2. A temperature limiter with magnetic blowout and multiple protections according to claim 1, characterized in that: Each of the electronic circuits is provided with a contact group, the power-off mechanism is arranged on the top of the temperature-limiting sub-component, and the action end of the power-off mechanism is simultaneously movably connected to the two contact groups of the temperature-limiting sub-component; The rear end of the electronic circuit on the left side of the previous temperature limiting sub-device is electrically connected to the front end of the electronic circuit on the left side of the next temperature limiting sub-device, and the rear end of the electronic circuit on the right side of the previous temperature limiting sub-device is electrically connected to the front end of the electronic circuit on the right side of the next temperature limiting sub-device, forming two power circuits.

3. A temperature limiter with magnetic blowout and multiple protections according to claim 2, characterized in that: The action end of the power-off mechanism is fixedly connected to the elastic contact, and the elastic contact is elastically connected to the top surface of the bottom of the groove of the lower shell; The front end of the front contact is used as the front end of the electronic circuit, the bottom surface of the rear end of the front contact is against the top surface of the front end of the elastic contact, the bottom surface of the front end of the rear contact is against the top surface of the rear end of the elastic contact, and the rear end of the rear contact is used as the rear end of the electronic circuit to form the contact group; When the power-off mechanism senses that the temperature exceeds a preset temperature, the action end of the power-off mechanism moves downward.

4. A temperature limiter with magnetic blowout and multiple protections according to claim 1, characterized in that: The bottom surface recessed position is an independent component, and the bottom surface recessed position can be detachably installed on the bottom surface of the accommodating groove, and the bottom surface recessed position is made of ceramic material.

5. A temperature limiter with magnetic blowout and multiple protections according to claim 1, characterized in that: When the magnet is replaced by an electromagnet, an electric control unit is provided on the top of the limit cover, the electric control unit is electrically connected to the electromagnet, and the electric control unit is controlled in linkage with the power-off mechanism.

6. A temperature limiter with magnetic blowout and multiple protections according to claim 1, characterized in that: The front contact, the elastic contact and the rear contact are all made of non-magnetic conductive material.

7. A temperature limiter with magnetic blowout and multiple protections according to claim 3, characterized in that: The power-off mechanism includes a power-off temperature-sensing package, a temperature-sensing capillary and an actuating rod; the power-off temperature-sensing package is arranged on the top of the upper shell, one end of the temperature-sensing capillary is connected to the interior of the power-off temperature-sensing package, and the other end of the temperature-sensing capillary extends outside the upper shell and is arranged at the target temperature-sensing position of the equipment where the temperature limiter is installed, the deformable bottom surface of the power-off temperature-sensing package is abutted against the top end of the actuating rod, and the bottom end of the actuating rod is fixedly connected to the elastic contact.

8. A temperature limiter with magnetic blowout and multiple protections according to claim 5, characterized in that: The electric control unit includes an electric control board, a linkage temperature sensing capillary and an electric control unit cover, wherein a linkage temperature sensing package is arranged inside the cover of the electric control unit cover; The electric control board is fixed on the top of the limit cover, the electric control part cover is arranged on the top of the limit cover and covers the electric control board, the deformable part of the linkage temperature sensing package is located above the magnetic field generating button of the electric control board, one end of the linkage temperature sensing capillary is connected to the interior of the linkage temperature sensing package, and the other end of the linkage temperature sensing capillary is connected to the temperature sensing component of the power-off mechanism.

9. A temperature limiter with magnetic blowout and multiple protections according to claim 1, characterized in that: A sealing member is clamped between the upper plug-in interface and the notch end of the accommodating groove.

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