A safe magnetic steel temperature limiter

Abstract

The present invention provides a safety magnetic steel temperature limiter, including a fixed bracket, on which a positioning groove is provided; and a main body bracket, wherein the fixed bracket is arranged at the top of the main body bracket, and a double-contact switch and a first push rod are arranged in the main body bracket; and a magnetic steel temperature limiter body, wherein the magnetic steel temperature limiter body is installed in the positioning groove; a mounting platform is arranged in the main body bracket, and a first through hole is arranged on the mounting platform, and the first push rod is slidably arranged in the first through hole, and the double-contact switch is arranged on both sides of the mounting platform and extends into the mounting platform, and the bottom of the first push rod abuts against the double-contact switch. The structure of the present application is simple and easy to use, and a safe and stable working environment is provided to the magnetic steel temperature limiter body by adding a fixed bracket and a main body bracket, the power supply is smoothly turned on and off, electrical failure is not prone to occur, and the service life is long. At the same time, the assembly process is effectively simplified, and it has good practicality.

Description

Technical Field

[0001] The present invention relates to the field of temperature limiters, and more particularly to a safety magnetic steel temperature limiter. Background Art

[0002] A magnetic steel temperature limiter is a temperature controller with hard magnetism and soft magnetism, mostly used in rice cookers. It belongs to a mechanical device that can realize automatic power-off of the rice cooker. It is mainly composed of soft magnetism without magnetism and hard magnetism with permanent magnetism.

[0003] When the hard magnet approaches the soft magnet at normal temperature, the two are adsorbed to each other. When the temperature rises to the Curie temperature point of the soft magnet, the magnetism of the soft magnet will decrease or even disappear, and thus the two are separated under the elastic force of the inner spring; when the temperature drops below the Curie temperature point of the soft magnet, the soft magnet can be magnetized under the action of the magnetic field.

[0004] The existing magnetic steel temperature limiters have complex structures and are extremely prone to poor power on and off due to the fitting accuracy between various components. The magnetic steel temperature limiter cannot be in a safe and stable working environment, resulting in extremely easy occurrence of safety problems and short service life. Summary of the Invention

[0005] Based on this, in order to solve the safety problem of traditional magnetic steel temperature limiters, the present invention provides a safety magnetic steel temperature limiter, and its specific technical solution is as follows:

[0006] A safety magnetic steel temperature limiter, comprising

[0007] A fixed bracket, on which a positioning groove is formed; and

[0008] A body bracket, the fixed bracket is arranged on the top of the body bracket, and a double-contact switch and a first push rod are arranged inside the body bracket; and

[0009] A magnetic steel temperature limiter body, which is installed in the positioning groove;

[0010] An installation table is arranged inside the body bracket, a first through hole is formed on the installation table, the first push rod is slidably arranged in the first through hole, the double-contact switch is arranged on both sides of the installation table and extends into the installation table, and the bottom of the first push rod abuts against the double-contact switch.

[0011] The above-mentioned safety magnetic steel temperature limiter has a simple and easy-to-use structure. By adding a fixed bracket and a body bracket, a safe and stable working environment is provided for the magnetic steel temperature limiter body. The power on and off is smooth, electrical faults are not likely to occur, the service life is long, and at the same time, the assembly process is effectively simplified, and it has good practicability.

[0012] Further, the magnet steel temperature limiter body includes a cup body, a soft magnetic block, a hard magnetic block, a second push rod, a first acting member, and a top cover. The top cover wraps around the top end of the cup body. The soft magnetic block is fixed in the middle of the inner side of the top cover. A hard magnetic block is arranged directly below the soft magnetic block. The magnetic poles of the soft magnetic block and the hard magnetic block are arranged to attract each other with opposite polarities. A second push rod is arranged in the middle of the hard magnetic block. A central hole is arranged in the middle of the bottom end of the cup body. The second push rod passes through the central hole. The first push rod is arranged corresponding to the second push rod. One end of the first acting member is connected to the soft magnetic block.

[0013] Further, the magnet steel temperature limiter body further includes a soft support. One end of the soft support is connected to the middle of the top cover, and the other end of the soft support is connected to the soft magnetic block. A hard support is arranged at the bottom of the hard magnetic block. The second push rod passes through the hard support.

[0014] Further, one end of the first acting member is connected to the hard support, and the other end of the first acting member is connected to the soft support.

[0015] Further, the axes of the first push rod and the second push rod coincide.

[0016] Further, a first mounting opening and a second mounting opening are respectively arranged on both sides of the mounting table of the body bracket. A static contact piece is arranged on the first mounting opening, and a moving contact piece is arranged on the second mounting opening. The static contact piece abuts against the moving contact piece, and the abutting position of the static contact piece and the moving contact piece is inside the mounting table.

[0017] Further, the first push rod abuts against the moving contact piece.

[0018] Further, a first snap ring and a second snap ring are arranged at the bottom end of the second push rod.

[0019] Further, a third snap ring for preventing the hard support from falling off the second push rod is arranged on the second push rod.

[0020] Further, the first push rod includes a rod body and a first countersunk head connected to the rod body. The outer diameter of the first countersunk head is larger than the aperture of the first through hole. Description of the Drawings

[0021] The present invention can be further understood from the following description in conjunction with the drawings. The components in the drawings are not necessarily drawn to scale, but the focus is on showing the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0022] Figure 1 is one of the schematic structural diagrams of a safety magnet steel temperature limiter in one of the embodiments of the present invention;

[0023] Figure 2 It is a schematic diagram of the explosion structure of a safety magnetic steel temperature limiter in one of the embodiments of the present invention;

[0024] Figure 3 It is the second schematic diagram of the structure of a safety magnetic steel temperature limiter in one of the embodiments of the present invention;

[0025] Figure 4 It is the third schematic diagram of the structure of a safety magnetic steel temperature limiter in one of the embodiments of the present invention;

[0026] Figure 5 It is the schematic diagram of the structure of the second buffer device of a safety magnetic steel temperature limiter in one of the embodiments of the present invention;

[0027] Figure 6 It is the schematic diagram of the structure of the shock-absorbing net of a safety magnetic steel temperature limiter in one of the embodiments of the present invention;

[0028] Figure 7 It is the schematic diagram of the structure of the shock-absorbing ball of a safety magnetic steel temperature limiter in one of the embodiments of the present invention;

[0029] Figure 8 It is the fourth schematic diagram of the structure of a safety magnetic steel temperature limiter in one of the embodiments of the present invention;

[0030] Figure 9 It is the schematic diagram of the structure of the first buffer device of a safety magnetic steel temperature limiter in one of the embodiments of the present invention;

[0031] Figure 10 It is an enlarged schematic diagram of the mating structure of the top cover and the heat-conducting plate of a safety magnetic steel temperature limiter in one of the embodiments of the present invention.

[0032] Explanation of reference numerals:

[0033] 100, body bracket; 110, mounting table; 111, first through hole; 120, safety protection pad; 121, connecting rib; 122, receiving rib; 123, shock-absorbing ball; 1231, sphere; 1232, small magnetic block; 124, shock-absorbing net; 200, fixed bracket; 201, positioning groove; 300, magnetic steel temperature limiter body; 301, top cover; 3011, heat-conducting plate; 3012, T-shaped groove; 3013, T-shaped block; 3014, heat-conducting wire; 302, soft support; 303, cup body; 304, hard support; 305, soft magnetic block; 306, first acting member; 307, hard magnetic block; 308, second push rod; 309, first buffer device; 310, second buffer device; 311, buffer pad; 400, double-contact switch; 401, moving contact piece; 402, static contact piece; 403, first silver contact; 404, second silver contact; 500, first push rod; 600, memory spring. Detailed implementation manners

[0034] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with its embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the protection scope of the present invention.

[0035] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only embodiments.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0037] The "first" and "second" mentioned in the present invention do not represent specific quantities and orders, but are only used for name distinction.

[0038] As Figures 1-9 shown, a safety magnetic steel temperature limiter in an embodiment of the present invention includes a fixed bracket 200, a body bracket 100, and a magnetic steel temperature limiter body 300; a positioning groove 201 is formed on the fixed bracket 200; the fixed bracket 200 is arranged on the top of the body bracket 100, and a double-contact switch 400 and a first push rod 500 are arranged inside the body bracket 100; the magnetic steel temperature limiter body 300 is installed in the positioning groove 201; an installation table 110 is arranged inside the body bracket 100, a first through hole 111 is formed on the installation table 110, the first push rod 500 is slidably arranged in the first through hole 111, the double-contact switch 400 is arranged on both sides of the installation table 110 and extends into the installation table 110, and the bottom of the first push rod 500 abuts against the double-contact switch 400.

[0039] The above-mentioned safety magnetic steel temperature limiter has a simple and easy-to-use structure. By adding the fixed bracket 200 and the body bracket 100, a safe and stable working environment is provided for the magnetic steel temperature limiter body 300. The power supply is switched on and off smoothly, electrical faults are not likely to occur, the service life is long, and at the same time, the assembly process is effectively simplified, and it has good practicability.

[0040] In one embodiment, the magnet thermostat body 300 includes a cup body 303, a soft magnetic block 305, a hard magnetic block 307, a second push rod 308, a first acting member 306, and a top cover 301. The top cover 301 wraps around the top end of the cup body 303. The soft magnetic block 305 is fixed to the middle of the inner side of the top cover 301. A hard magnetic block 307 is arranged directly below the soft magnetic block 305. The magnetic poles of the soft magnetic block 305 and the hard magnetic block 307 are arranged to attract each other with opposite polarities. A second push rod 308 is arranged in the middle of the hard magnetic block 307. A central hole is arranged in the middle of the bottom end of the cup body 303. The second push rod 308 passes through the central hole. The first push rod 500 is arranged corresponding to the second push rod 308. One end of the first acting member 306 is connected to the soft magnetic block 305.

[0041] In one embodiment, the magnet thermostat body 300 further includes a soft support 302. One end of the soft support 302 is connected to the middle of the top cover 301, and the other end of the soft support 302 is connected to the soft magnetic block 305. A hard support 304 is arranged at the bottom of the hard magnetic block 307. The second push rod 308 passes through the hard support 304.

[0042] In one embodiment, a first buffer device 309 is sleeved on the part of the second push rod 308 between the cup body 303 and the hard support 304. The first buffer device 309 includes an annular inclined spring, and the annular inclined spring is composed of an inclined spring and a nested component. Specifically, one end joint and the other end joint of the inclined spring are wedge-shaped joints that are adapted to each other. The outer diameter of the two wedge-shaped joints after being overlapped is equal to the outer diameter of the inclined spring. The two wedge-shaped joints are mechanically nested and fastened through the nested component, which can eliminate the torsional moment and compressive stress of the joints and the problems of fatigue strength and the like brought to the traditional welded annular inclined spring, especially the heavy-duty annular inclined spring applied in the fields of shock absorption, vibration isolation, and buffering. In addition to being arranged on the wedge-shaped joints, the nested component can also be evenly distributed on the inclined spring to enhance its fatigue resistance. By using the first buffer device 309, it is possible to prevent the hard magnetic block 307 and the hard support 304 from falling and colliding hard with the cup body 303. Due to the setting of the first buffer device 309, on the premise that it is ensured that the second push rod 308 can fall and hit the first push rod 500 and force the double-contact switch 400 to disconnect, the height of the cup body 303 can be shortened as much as possible without considering the impact, vibration, fatigue and other problems caused by the hard magnet and the hard support 304 falling and colliding with the cup body 303. Thus, the magnet thermostat body 300 can be made smaller, reducing the occupied space of the magnet thermostat, thereby reducing costs, and saving other design spaces for other accessories, so that the product has more functions.

[0043] In one embodiment, the first buffer device 309 further includes a buffer pad 311. The buffer pad 311 is in an annular disc structure. The buffer pad 311 is sleeved on the second push rod 308 and abuts against the top of the annular inclined spring. More preferably, the buffer pad 311 semi-wraps the upper half of the annular inclined spring, thereby constraining the shape of the annular inclined spring to ensure that its performance remains unchanged. The buffer pad 311 can be made of materials such as sponge or rubber that have the performance of absorbing energy through collision deformation. This design can better provide the effects of shock isolation and vibration isolation and further strengthen the buffer effect.

[0044] In one embodiment, a second buffer device 310 is provided on the inner wall of the bottom of the cup body 303. The second buffer device 310 is a conical ring. More preferably, the conical ring is made of materials such as sponge or rubber that have the performance of absorbing energy through collision deformation. The outer wall of the second buffer device 310 is attached to the inner wall of the bottom of the cup body 303, and the larger diameter end of the conical ring is close to the bottom of the hard magnetic block 307. The conical inner wall of the second buffer device 310 has a friction self-locking function and can well further strengthen the buffer function by frictionally contacting the bottom of the hard support 304 or directly with the bottom of the hard magnetic block 307 through the conical inner wall. At the same time, the design of the conical inner wall can make the resistance received by the bottom of the hard support 304 or the bottom of the hard magnetic block 307 increase correspondingly every time it descends by a certain height, so as to better achieve the effect of friction self-locking buffer. Preferably, the conical ring includes a base that fits against the inner wall of the bottom of the cup body 303 and a number of wedge-shaped locking blocks provided on the base. The wedge-shaped locking blocks are arranged at equal intervals. This design is to ensure that the second buffer device 310 has greater deformation ability so as to improve its friction self-locking buffer effect.

[0045] In one embodiment, the first acting member 306 is a permanent magnet that is magnetically repulsive to the hard magnetic block 307, and the magnetism of the permanent magnet is less than that of the hard magnetic block 307. By using the permanent magnet as the first acting member 306, the problem that the rice cooker fails due to the spring being easily damaged or deformed after long-term use is solved.

[0046] In one embodiment, the first acting member 306 is a compression spring. One end of the first acting member 306 is connected to the hard support 304, and the other end of the first acting member 306 is connected to the soft support 302. Through this design, when the magnetism of the soft magnetic block 305 weakens, a force can be quickly applied to the hard magnetic block 307 to ensure that it immediately disengages and then disconnects the double-point touch switch. This design can effectively ensure the accuracy of the entire temperature control process.

[0047] In one embodiment, the axes of the first push rod 500 and the second push rod 308 coincide. This design can ensure the balanced force of the overall structure and improve safety and durability.

[0048] In one embodiment, on both sides of the mounting table 110 of the body bracket 100, a first mounting port and a second mounting port are respectively provided. A static contact piece 402 is provided on the first mounting port, and a moving contact piece 401 is provided on the second mounting port. The static contact piece 402 abuts against the moving contact piece 401, and the abutting portion of the static contact piece 402 and the moving contact piece 401 is located within the mounting table 110.

[0049] In one embodiment, a shielding cavity is provided within the mounting table 110. The first through hole 111 on the mounting table 110 communicates the shielding cavity with the body bracket 100. A safety protection pad 120 is provided at the bottom of the shielding cavity. The abutting portion is located above the safety protection pad 120. When the first push rod 500 drives the moving contact piece 401 to disengage, the moving contact piece 401 will abut against the safety protection pad 120. The safety protection pad 120 can prevent the hard contact between the moving contact piece 401 and the bottom of the shielding cavity, and at the same time reduce the movement stroke of the moving contact piece 401, thereby reducing the fatigue strength of the moving contact piece 401, enhancing its lifespan, and effectively improving safety. The safety protection pad 120 includes a connecting rib 121 and a receiving rib 122. The connecting rib 121 is fixed on the inner wall of the shielding cavity, and the receiving rib 122 is fixed on the inner wall of the shielding cavity and is located below the connecting rib 121. The downward surface of the connecting rib 121 is a downwardly inclined slope. The upward surface of the receiving convex block has the same inclination angle and the same length as the downward surface of the connecting rib 121. Since the contact surface between the connecting rib 121 and the receiving rib 122 has the same inclination angle and length, the weight can be evenly distributed on the surface of the receiving rib 122.

[0050] A damping net 124 is provided on the upper surface of the receiving rib 122. Vibration damping balls 123 are evenly distributed at each node of the damping net 124 to absorb vibration. In addition, a number of round pits are provided on the surface where the receiving rib 122 contacts the connecting rib 121. The distribution of the round pits on the receiving rib 122 is the same as the distribution of the vibration damping balls 123 on the damping net 124. After the damping net 124 is laid on the surface of the receiving rib 122, the vibration damping balls 123 will fall into the round pits and rotate in the round pits to prevent the position of the vibration damping balls 123 from moving during use.

[0051] The vibration damping ball 123 includes a sphere 1231 and a small magnetic block 1232. The sphere 1231 is made of elastic material. The small magnetic block 1232 is embedded in the sphere 1231. The small magnetic block 1232 is not located at the center of the ball, but close to the spherical surface. When the vibration damping ball 123 is fixed on the vibration damping net 124, the small magnetic blocks 1232 of the vibration damping ball 123 on the same vibration damping net 124 face the same direction; in addition, a magnetic film is also arranged below the circular pit where the vibration damping net 124 is installed. After the vibration damping net 124 is laid, the magnetic film will attract the small magnetic block 1232 in the vibration damping ball 123 to fix the vibration damping net 124 and prevent it from leaving the circular pit. Since the small magnetic block 1232 is eccentrically arranged in the vibration damping ball, the attraction between the small magnetic block 1232 and the magnetic film is stronger, and the fixing effect is better.

[0052] Through the above design, the durability of the moving contact piece 401 can be effectively improved. At the same time, due to the structure and material factors of the safety protection pad 120, it has a buffering and energy-absorbing effect, which can absorb the impact of the moving contact piece 401 contacting the safety protection pad 120 to achieve a buffering effect, and prevent it from rebounding and causing the static contact piece 402 to be too close to the position and cause electric sparks.

[0053] In one embodiment, the first push rod 500 abuts against the movable contact piece 401.

[0054] In one embodiment, the bottom end of the second push rod 308 is provided with a first clamping ring and a second clamping ring.

[0055] In one embodiment, the second push rod 308 is provided with a third clamping ring for preventing the hard support 304 from falling off the second push rod 308.

[0056] In one embodiment, the first push rod 500 includes a rod body and a first countersunk head connected to the rod body, and the outer diameter of the first countersunk head is greater than the aperture of the first through hole 111.

[0057] In one embodiment, a memory spring 600 is provided on the positioning groove 201 of the fixing bracket 200, and the top cover 301 is connected to the top of the memory spring 600. The memory spring 600 is a CuZnAl memory alloy spring. The memory spring 600 has the characteristic of elongation when heated, and can lift the top cover 301 when heated, so that the top cover 301 always keeps a close contact surface with the temperature control product under pressure, which can effectively reduce the interface thermal resistance, thereby improving the accuracy of temperature sensing, thereby ensuring the action accuracy of the magnetic steel temperature limiter.

[0058] In one embodiment, an installation groove is formed in the top cover 301. The installation groove slopes downward. The cup body 303 and the soft support 302 are inserted into the installation groove. When the top cover 301 is lifted, the cup body 303 and the soft support 302 rise synchronously, thereby achieving precise heat conduction and ensuring the safety and precise temperature control of the overall structure.

[0059] In one embodiment, as Figures 1-10 shown, a safety magnetic steel temperature limiter includes a body bracket 100 and a heat conduction plate 3011. First installation openings and second installation openings are respectively arranged on two sides of the bottom end of the body bracket 100. A static contact piece 402 is arranged on the first installation opening, and a moving contact piece 401 is arranged on the second installation opening. The static contact piece 402 abuts against the moving contact piece 401. An installation table 110 is arranged between the first installation opening and the second installation opening. A first through hole 111 is formed in the installation table 110. A first push rod 500 is arranged in the first through hole 111. The first push rod 500 is slidably connected with the first through hole 111. One end of the first push rod 500 abuts against the moving contact piece 401. A fixed bracket 200 is arranged at the top end of the body bracket 100. A positioning groove 201 is formed in the middle of the fixed bracket 200. A magnetic steel temperature limiter body 300 is clamped in the positioning groove 201. The magnetic steel temperature limiter body 300 includes a cup body 303, a soft magnetic block 305, a hard magnetic block 307, a second push rod 308, a first acting member 306 and a top cover 301. The top cover 301 wraps the top end of the cup body 303. The soft magnetic block 305 is fixed in the middle of the inner side of the top cover 301. A hard magnetic block 307 is arranged directly below the soft magnetic block 305. The magnetic poles of the soft magnetic block 305 and the hard magnetic block 307 are arranged in an attracting manner with opposite polarities. A second push rod 308 is arranged in the middle of the hard magnetic block 307. A central hole is arranged in the middle of the bottom end of the cup body 303. The second push rod 308 passes through the central hole. The first push rod 500 and the second push rod 308 are arranged correspondingly. One end of the first acting member 306 is connected to the hard magnetic block 307, and the other end of the first acting member 306 is connected to the soft magnetic block 305. First and second snap rings are arranged at the bottom end of the second push rod 308. A T-shaped clamping block 3013 is arranged on the top cover 301. A T-shaped groove 3012 is arranged on the heat conduction plate 3011. The T-shaped clamping block 3013 and the T-shaped groove 3012 are matched and clamped. The heat conduction plate 3011 is provided with a plurality of heat conduction wires 3014. Specifically, the first acting member 306 is a spring.

[0060] Specifically, by providing soft magnetic blocks 305 and hard magnetic blocks 307, and utilizing the physical properties of the soft magnetic blocks 305 and hard magnetic blocks 307, the product to be temperature-controlled is in contact with the heat conduction plate 3011 and the heat conduction wire 3014 to transfer the temperature to the top cover 301, and then conduct the temperature to the soft magnetic blocks 305. In the normal temperature state, the hard magnetic blocks 307 are adsorbed to the soft magnetic blocks 305. When the temperature of the product to be temperature-controlled rises, the magnetism of the soft magnetic blocks 305 gradually weakens. Until the product to be temperature-controlled reaches the specified temperature, the magnetism of the soft magnetic blocks 305 disappears, and the hard magnetic blocks 307 are detached from the soft magnetic blocks 305. Under the action of gravity, while the hard magnetic blocks 307 fall in the vertical direction, the second push rod 308 on the hard magnetic blocks 307 also descends until the second push rod 308 contacts the first push rod 500. Then, the first push rod 500 pushes the static contact piece 402 to separate from the moving contact piece 401, thereby cutting off the power supply and stopping heating, thus achieving the purpose of temperature control. One end of the first acting member 306 is connected to the hard magnetic block 307, and the other end of the first acting member 306 is connected to the soft magnetic block 305. When the magnetism of the soft magnetic blocks 305 weakens, the first acting member 306 can quickly drive the hard magnetic blocks 307 to fall rapidly, so that under the action of the self-gravity of the hard magnetic blocks 307 plus the thrust of the first acting member 306, the force of the second push rod 308 acting on the first push rod 500 can cause the moving contact piece 401 to separate from the static contact piece 402. When the temperature of the external temperature-controlled product decreases, the soft magnetic blocks 305 recover their magnetism, the hard magnetic blocks 307 are adsorbed, the first push rod 500 and the second push rod 308 are reset, and the static contact piece 402 contacts the moving contact piece 401, thereby connecting the power supply and starting to heat the external temperature-controlled product. During use, a lever of a key switch can also be inserted between the first snap ring and the second snap ring according to actual needs, so that the hard magnetic block body 307 will not fall due to temperature changes, thereby continuously heating the external temperature-controlled product, achieving multi-mode heating of the external temperature-controlled product, with a simple and easy-to-use structure, smooth power on and off, not prone to failure, and a long service life. Through the matching clamping connection form of the T-shaped clamping block 3013 and the T-shaped groove 3012, when the heat conduction plate 3011 is damaged due to long-term contact between the external temperature-controlled product and the heat conduction plate 3011, it can be quickly replaced. In addition, the heat conduction wire 3014 on the heat conduction plate 3011 contacts the temperature-controlled product. Since the heat conduction wire 3014 is thin, when the temperature-controlled product contacts the heat conduction plate 3011, the gap of the contact surface is filled by the heat conduction wire 3014, always keeping the contact surface closely matched, thereby avoiding poor heat conduction caused by uneven contact surface due to long-term contact between the temperature-controlled product and the heat conduction plate 3011 and not achieving precise temperature control.

[0061] In one embodiment, the magnetic steel temperature limiter body 300 further includes a soft support 302, one end of which is connected to the middle of the top cover 301, and the other end of which is connected to the soft magnetic block 305. The bottom end of the hard magnetic block 307 is provided with a hard support 304, and the second push rod 308 passes through the hard support 304. The second push rod 308 is provided with a third clamping ring for preventing the hard support 304 from falling off the second push rod 308. One end of the first force member 306 is connected to the hard support 304, and the other end of the first force member 306 is connected to the soft support 302. The structure is more reasonable, and the connection between the soft magnetic block 305 and the top cover 301 is tighter and more reliable through the soft support 302.

[0062] In one embodiment, a second through hole is provided in the middle of the hard magnetic block 307, a countersunk groove is provided on one end surface of the second through hole, a second countersunk head is provided on one end of the second push rod 308, the countersunk groove matches the countersunk head, and the second push rod 308 will not be separated from the second through hole during use through the cooperation of the countersunk groove and the second countersunk head.

[0063] In one embodiment, a first silver contact 403 is provided at one end of the stationary contact piece 402, and a second silver contact 404 is provided at one end of the moving contact piece 401. The first silver contact 403 and the second silver contact 404 are in contact with each other. The resistance of silver itself is relatively small. When the stationary contact piece 402 and the moving contact piece 401 are in contact with each other through the first silver contact 403 and the second silver contact 404, the phenomenon of electric sparks can be reduced, thereby extending the service life of the stationary contact piece 402 and the moving contact piece 401.

[0064] In one embodiment, the top cover 301 is made of aluminum, which has faster heat conduction and less heat loss, ensuring that the soft magnetic block 305 is heated synchronously with the product to be temperature-controlled, thereby improving the accuracy of temperature control. The main body bracket 100 is made of high-temperature resistant and flame-retardant plastic material, and the first push rod 500 and the second push rod 308 are both made of ceramic material, which has poor conductivity, high hardness and longer service life.

[0065] In one embodiment, both ends of the fixing bracket 200 are provided with first mounting holes, and the fixing bracket 200 is connected to the top of the main bracket 100 by screws passing through the mounting holes. The mounting platform 110 and the main bracket 100 are an integrated structure, and the structure is more stable and reliable.

[0066] In one of the embodiments, the static contact piece 402 has a first extension block, and the moving contact piece 401 has a second extension block. A plurality of second mounting holes are formed in both the first extension block and the second extension block. The second mounting holes are fixed to the inner cavity of the body bracket 100 by screws passing through the second mounting holes, and the locking is more reliable.

[0067] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0068] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A safety magnetic steel temperature limiter, characterized in that: include A fixed bracket, wherein a positioning groove is formed on the fixed bracket; as well as A main body bracket, wherein the fixing bracket is arranged on the top of the main body bracket, and a double-contact switch and a first push rod are arranged in the main body bracket; as well as A magnetic steel temperature limiter body, wherein the magnetic steel temperature limiter body is installed in the positioning groove; A mounting platform is provided in the main body bracket, a first through hole is provided on the mounting platform, the first push rod is slidably provided in the first through hole, the double-contact switch is provided on both sides of the mounting platform and extends into the mounting platform, and the bottom of the first push rod abuts against the double-contact switch; The magnetic steel temperature limiter body comprises a cup body, a soft magnetic block, a hard magnetic block, a second push rod, a first force member and a top cover, wherein the top cover is wrapped around the top end of the cup body, the soft magnetic block is fixed to the middle inner side of the top cover, a hard magnetic block is arranged directly below the soft magnetic block, the magnetic poles of the soft magnetic block and the magnetic poles of the hard magnetic block are arranged in an oppositely attracted manner, a second push rod is arranged in the middle of the hard magnetic block, a center hole is arranged in the middle of the bottom end of the cup body, the second push rod passes through the center hole, the first push rod is arranged corresponding to the second push rod, and one end of the first force member is connected to the soft magnetic block; The magnetic steel temperature limiter body also includes a soft support, one end of the soft support is connected to the middle of the top cover, the other end of the soft support is connected to the soft magnetic block, a hard support is provided at the bottom of the hard magnetic block, and the second push rod passes through the hard support; The axes of the first push rod and the second push rod coincide with each other, a first mounting opening and a second mounting opening are respectively provided on both sides of the mounting platform of the main body bracket, a static contact piece is provided on the first mounting opening, a dynamic contact piece is provided on the second mounting opening, the static contact piece abuts against the dynamic contact piece, and the abutment portion of the static contact piece and the dynamic contact piece is located inside the mounting platform; A first buffer device is sleeved on the portion of the second push rod located between the cup body and the hard support, the first buffer device includes an annular oblique spring, the annular oblique spring is composed of an oblique spring and a nesting piece, one end joint and the other end joint of the oblique spring are mutually adaptive wedge joints, the outer diameter of the two wedge joints after being overlapped is equal to the outer diameter of the oblique spring, and the two wedge joints are mechanically nested and fastened through the nesting piece; A shielding cavity is arranged in the mounting platform, the first through hole on the mounting platform connects the shielding cavity and the main body bracket, a safety protection pad is arranged at the bottom of the shielding cavity, the abutment is located above the safety protection pad, the safety protection pad comprises a connecting convex strip and a receiving convex strip, the connecting convex strip is fixed on the inner wall of the shielding cavity, the receiving convex strip is fixed on the inner wall of the shielding cavity and is located below the connecting convex strip, the downward surface of the connecting convex strip is a downward inclined surface, the upward surface of the receiving convex strip has the same inclination angle and the same length as the downward surface of the connecting convex strip, a vibration reduction net is arranged on the upper surface of the receiving convex strip, and each node of the vibration reduction net Vibration-damping balls are evenly distributed, and a number of circular pits are arranged on the contact surface of the receiving convex strip and the connecting convex strip. The distribution of the circular pits on the receiving convex strip is the same as the distribution of the vibration-damping balls on the vibration-damping net. After the vibration-damping net is laid on the surface of the receiving convex strip, the vibration-damping balls fall into the circular pits and rotate in the circular pits. The vibration-damping balls include a sphere and a small magnetic block. The sphere is made of elastic material. The small magnetic block is embedded in the sphere. The small magnetic block is close to the spherical surface. When the vibration-damping balls are fixed on the vibration-damping net, the small magnetic blocks of the vibration-damping balls on the same vibration-damping net face the same direction. A magnetic film is also arranged below the circular pit for installing the vibration-damping net. After the vibration-damping net is laid, the magnetic film and the small magnetic blocks in the vibration-damping balls attract each other to fix the vibration-damping net.

2. A safety magnetic steel temperature limiter as claimed in claim 1, characterized in that: One end of the first force member is connected to the hard support, and the other end of the first force member is connected to the soft support.

3. A safety magnetic steel temperature limiter as claimed in claim 2, characterized in that: The first push rod abuts against the movable contact piece.

4. A safety magnetic steel temperature limiter as claimed in claim 3, characterized in that: A first clamping ring and a second clamping ring are arranged at the bottom end of the second push rod.

5. A safety magnetic steel temperature limiter as claimed in claim 4, characterized in that: The second push rod is provided with a third clamping ring for preventing the hard support from falling off the second push rod.

6. A safety magnetic steel temperature limiter according to any one of claims 1 to 5, characterized in that: The first push rod includes a rod body and a first countersunk head connected to the rod body, and the outer diameter of the first countersunk head is larger than the aperture of the first through hole.

Images