A durable rice cooker

Abstract

The present invention provides a durable rice cooker, comprising: a rice cooker body; an inner pot, the inner pot is arranged in the rice cooker body, and a recess is arranged at the bottom of the inner pot; a magnetic steel temperature limiter, the magnetic steel temperature limiter is embedded in the recess; the magnetic steel temperature limiter comprises: a fixed bracket, the fixed bracket is provided with a positioning groove; and a magnetic steel temperature limiter body, the magnetic steel temperature limiter body is installed in the positioning groove; and a memory spring, the memory spring is arranged in the positioning groove and connected to the magnetic steel temperature limiter body. By setting the memory spring, the present application can always keep the contact surface of the magnetic steel temperature limiter body and the temperature control product in close cooperation under heat, can effectively reduce the interface thermal resistance, thereby achieving the improvement of the accuracy of temperature sensing, thereby ensuring the action accuracy of the magnetic steel temperature limiter.

Description

Technical Field

[0001] The invention relates to the field of kitchen appliances, in particular to a durable electric rice cooker. Background Art

[0002] The rice cooker is a temperature controller with hard magnetism and soft magnetism, which is mostly used in rice cookers. It is 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 hard magnet is close to soft magnet at room temperature, the magnetic field of the hard magnet will magnetize the soft magnet, and then the two will be attracted to each other. When the temperature rises to the Curie temperature of the soft magnet, the magnetism of the soft magnet will decrease or even disappear, and the two will be separated under the elastic force of the internal spring. When the temperature drops below the Curie temperature of the soft magnet, the soft magnet can be magnetized under the action of the magnetic field.

[0004] The existing temperature controller has a complex structure, and it is very easy to cause power supply failure due to the matching accuracy between various accessories. The temperature controller cannot be in a safe and stable working environment, which leads to safety problems and a short service life. Summary of the invention

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

[0006] A durable rice cooker, comprising:

[0007] Rice cooker body;

[0008] An inner pot, wherein the inner pot is arranged in the electric rice cooker body, and a concave position is provided at the bottom of the inner pot;

[0009] A magnetic steel temperature limiter, wherein the magnetic steel temperature limiter is embedded in the recessed position;

[0010] The magnetic steel temperature limiter comprises:

[0011] A fixing bracket, wherein a positioning groove is formed on the fixing bracket; and

[0012] A magnetic steel temperature limiter body, wherein the magnetic steel temperature limiter body is installed in the positioning groove; and

[0013] A memory spring is disposed in the positioning groove and connected to the magnetic steel temperature limiter body.

[0014] The above-mentioned durable rice cooker, by providing the memory spring, can always keep the contact surface of the magnetic steel temperature limiter body and the temperature control product in close cooperation when heated, and 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.

[0015] Furthermore, the magnetic steel temperature limiter also includes a main body bracket, the fixed 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;

[0016] 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.

[0017] Furthermore, the magnetic steel temperature limiter body includes a cup body, a soft magnetic block, a hard magnetic block, a second push rod, a first force member and a top cover, the top cover is wrapped around the top end of the cup body, the soft magnetic block is fixed on the inner middle part 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 to attract each other in opposite poles, 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.

[0018] Furthermore, 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.

[0019] Further, 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.

[0020] Furthermore, a first mounting port and a second mounting port 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 port, and a dynamic contact piece is provided on the second mounting port, the static contact piece abuts against the dynamic contact piece, and the abutting point between the static contact piece and the dynamic contact piece is located inside the mounting platform.

[0021] Furthermore, the first push rod abuts against the movable contact piece.

[0022] Furthermore, a first clamping ring and a second clamping ring are provided at the bottom end of the second push rod.

[0023] Furthermore, the memory spring is connected between the top cover and the positioning groove.

[0024] Furthermore, the first push rod includes a rod body and a first countersunk head connected to the rod body, and an outer diameter of the first countersunk head is larger than a diameter of the first through hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention can be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily drawn to scale, but the emphasis is placed on illustrating the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0026] Figure 1 It is a structural schematic diagram of a durable rice cooker in one embodiment of the present invention;

[0027] Figure 2 It is one of the structural schematic diagrams of a magnetic steel temperature limiter of a durable electric rice cooker in one embodiment of the present invention;

[0028] Figure 3 This is a second structural schematic diagram of a magnetic steel temperature limiter of a durable electric rice cooker in one embodiment of the present invention;

[0029] Figure 4 It is a schematic diagram of the explosion structure of a magnetic steel temperature limiter of a durable electric rice cooker in one embodiment of the present invention;

[0030] Figure 5 This is a third structural schematic diagram of a magnetic steel temperature limiter of a durable electric rice cooker in one embodiment of the present invention;

[0031] Figure 6 This is a fourth structural schematic diagram of a magnetic steel temperature limiter of a durable electric rice cooker in one embodiment of the present invention;

[0032] Figure 7 It is a structural schematic diagram of a second buffer device of a magnetic steel temperature limiter of a durable electric rice cooker in one embodiment of the present invention;

[0033] Figure 8 It is a structural schematic diagram of a vibration reduction net of a magnetic steel temperature limiter of a durable electric rice cooker in one embodiment of the present invention;

[0034] Fig. 9 It is a structural schematic diagram of a slow vibration ball of a magnetic steel temperature limiter of a durable electric rice cooker in one embodiment of the present invention;

[0035] Fig.10 It is a structural schematic diagram of a first buffer device of a magnetic steel temperature limiter of a durable electric rice cooker in one embodiment of the present invention;

[0036] Fig.11 The invention is an enlarged schematic diagram of the matching structure of a top cover and a heat conducting plate of a magnetic steel temperature limiter of a durable electric rice cooker in one embodiment of the present invention.

[0037] Description of reference numerals:

[0038] 100, main body bracket; 110, mounting platform; 111, first through hole; 120, safety protection pad; 121, connecting convex strip; 122, receiving convex strip; 123, damping ball; 1231, sphere; 1232, small magnetic block; 124, vibration reduction net; 200, fixing bracket; 201, positioning groove; 300, magnetic steel temperature limiter body; 301, top cover; 3011, heat conduction plate; 3012, T-shaped groove; 3013, T-shaped block; 3014, heat conduction wire; 302 , soft support; 303, cup body; 304, hard support; 305, soft magnetic block; 306, first force 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; 700, rice cooker body; 701, liner. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with its embodiments. It should be understood that the specific implementation methods described herein are only used to explain the present invention and do not limit the protection scope of the present invention.

[0040] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention 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 related listed items.

[0042] The “first” and “second” mentioned in the present invention do not represent specific quantities and orders, but are merely used to distinguish names.

[0043] like Figure 1-10 As shown, a durable rice cooker in one embodiment of the present invention comprises:

[0044] Rice cooker body 700;

[0045] An inner pot 701, wherein the inner pot 701 is disposed in the electric rice cooker body 700, and a recess is provided at the bottom of the inner pot 701;

[0046] A magnetic steel temperature limiter, wherein the magnetic steel temperature limiter is embedded in the recessed position; the magnetic steel temperature limiter comprises a fixed bracket 200, a main body bracket 100 and a magnetic steel temperature limiter body 300; a positioning groove 201 is provided on the fixed bracket 200; the fixed bracket 200 is arranged at the top of the main body bracket 100, and a double-contact switch 400 and a first push rod 500 are arranged in the main body bracket 100; the magnetic steel temperature limiter is installed in the positioning groove 201; a mounting platform 110 is arranged in the main body bracket 100, and a first through hole 111 is arranged on the mounting platform 110, and the first push rod 500 is slidably arranged in the first through hole 111, and the double-contact switch 400 is arranged on both sides of the mounting platform 110 and extends into the mounting platform 110, and the bottom of the first push rod 500 abuts against the double-contact switch 400.

[0047] The above-mentioned durable rice cooker has a simple structure and is easy to use. By adding a fixed bracket 200 and a main body bracket 100, a safe and stable working environment is provided for the magnetic steel temperature limiter body 300. The power supply is smooth on and off, electrical failures are 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.

[0048] In one embodiment, 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 force member 306 and a top cover 301, the top cover 301 is wrapped around the top of the cup body 303, the soft magnetic block 305 is fixed to the inner middle part 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 magnetic poles of the hard magnetic block 307 are arranged in an oppositely attracted manner, a second push rod 308 is arranged in the middle of the hard magnetic block 307, a center hole is arranged in the middle of the bottom end of the cup body 303, the second push rod 308 passes through the center hole, the first push rod 500 is arranged corresponding to the second push rod 308, and one end of the first force member 306 is connected to the soft magnetic block 305.

[0049] In one embodiment, the magnetic steel temperature limiter body 300 also 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 provided at the bottom of the hard magnetic block 307, and the second push rod 308 passes through the hard support 304.

[0050] In one embodiment, the first buffer device 309 is sleeved on the portion of the second push rod 308 between the cup body 303 and the hard support 304. The first buffer device 309 includes an annular oblique spring, which is composed of an oblique spring and a nested piece. Specifically, the joint at one end and the joint at the other end of the oblique spring are mutually adapted wedge joints. The outer diameter of the two wedge joints after being overlapped is equal to the outer diameter of the oblique spring. The two wedge joints are mechanically nested and fastened through the nested piece, which can eliminate the problems such as fatigue strength caused by the torsional moment and compressive stress of the joints to the traditional welded annular oblique spring, especially the heavy-duty annular oblique spring used in the fields of vibration reduction, vibration isolation and buffering. In addition to being arranged on the wedge joint, the nested piece can also be evenly distributed on the oblique spring to enhance its fatigue resistance. By using the first buffer device 309, the hard magnetic block 307 and the hard support 304 can be prevented from falling and colliding hard with the cup body 303; because the first buffer device 309 is provided, 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, while ensuring that the second push rod 308 can hit the first push rod 500 after falling and force the double-contact switch 400 to disconnect. As a result, the magnetic steel temperature limiter body 300 can be made smaller, reducing the space occupied by the magnetic steel temperature limiter, thereby reducing costs, and saving other design space for other accessories, so that the product has more functions.

[0051] In one embodiment, the first buffer device 309 also includes a buffer pad 311, which is an annular disc structure. The buffer pad 311 is sleeved on the second push rod 308 and abuts against the top of the annular oblique spring; more preferably, the buffer pad 311 half wraps the upper half of the annular oblique spring, thereby constraining the shape of the annular oblique spring to ensure that its performance remains unchanged; the buffer pad 311 can be made of sponge or rubber and other materials with collision deformation energy absorption properties. This design is able to better provide seismic isolation and vibration isolation functions and further enhance the buffering effect.

[0052] In one embodiment, a second buffer device 310 is provided on the inner wall at the bottom of the cup body 303. The second buffer device 310 is a conical ring. More preferably, the conical ring is made of a material with collision deformation energy absorption performance such as sponge or rubber. The outer wall of the second buffer device 310 is in contact with the inner wall at 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, which can be well contacted with the bottom of the hard support 304 or directly with the bottom of the hard magnetic block 307 through the conical inner wall to further enhance the buffering function. At the same time, the design of the conical inner wall can make the resistance of the bottom of the hard support 304 or the bottom of the hard magnetic block 307 increase accordingly when it drops a certain height, so as to better achieve the effect of friction self-locking buffering. Preferably, the conical ring includes a base that fits with the inner wall of the bottom of the cup body 303 and a plurality of wedge-shaped locking blocks arranged on the base, and the wedge-shaped locking blocks are arranged at equal intervals; this design is to ensure that the second buffer device 310 has a greater deformation ability and thus improve its friction self-locking buffer effect.

[0053] In one embodiment, the first force member 306 is a permanent magnet that magnetically repels the hard magnetic block 307, and the magnetism of the permanent magnet is smaller than that of the hard magnetic block 307. By using the permanent magnet as the first force member 306, the problem that the spring is easily damaged or deformed due to long-term use, thereby causing the rice cooker to fail, is solved.

[0054] In one embodiment, the first force member 306 is a compression spring, 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. This design can quickly apply force to the hard magnetic block 307 when the magnetic property of the soft magnetic block 305 is weakened, so as to ensure that it is immediately separated and then disconnect the double-point touch switch. This design can effectively ensure the accuracy of the entire temperature control process.

[0055] In one embodiment, the axes of the first push rod 500 and the second push rod 308 coincide with each other. This design can ensure that the overall structure is balanced in force, thereby improving safety and durability.

[0056] In one embodiment, a first mounting port and a second mounting port are respectively provided on both sides of the mounting platform 110 of the main body bracket 100, a static contact piece 402 is provided on the first mounting port, and a dynamic contact piece 401 is provided on the second mounting port, the static contact piece 402 abuts against the dynamic contact piece 401, and the abutting point between the static contact piece 402 and the dynamic contact piece 401 is located inside the mounting platform 110.

[0057] In one embodiment, a shielding cavity is provided in the mounting platform 110, and the first through hole 111 on the mounting platform 110 connects the shielding cavity with the main body bracket 100, and a safety protection pad 120 is provided at the bottom of the shielding cavity, and the abutment point 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 avoid hard contact between the moving contact piece 401 and the bottom of the shielding cavity, while reducing the movement stroke of the moving contact piece 401 and thereby reducing the fatigue strength of the moving contact piece 401, thereby enhancing the service life and effectively improving safety. The safety protection pad 120 includes a connecting ridge 121 and a receiving ridge 122. The connecting ridge 121 is fixed on the inner wall of the shielding cavity. The receiving ridge 122 is fixed on the inner wall of the shielding cavity and is located below the connecting ridge 121. The downward surface of the connecting ridge 121 is a downward inclined surface. The upward surface of the receiving ridge has the same inclination angle and length as the downward surface of the connecting ridge 121. Since the inclination angle and length of the surface where the connecting ridge 121 contacts the receiving ridge 122 are the same, the weight can be evenly distributed on the surface of the receiving ridge 122.

[0058] A vibration-damping net 124 is arranged on the upper surface of the receiving convex strip 122, and vibration-damping balls 123 are evenly distributed at various nodes of the vibration-damping net 124 to absorb vibration. In addition, a plurality of circular pits are arranged on the contact surface of the receiving convex strip 122 and the connecting convex strip 121, and the distribution of the circular pits on the receiving convex strip 122 is the same as the distribution of the vibration-damping balls 123 on the vibration-damping net 124. After the vibration-damping net 124 is laid on the surface of the receiving convex strip 122, the vibration-damping balls 123 will fall into the circular pits and rotate in the circular pits to prevent the vibration-damping balls 123 from moving during use.

[0059] 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 sphere, 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 for installing the vibration damping net 124. 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 shock-absorbing ball, the attraction between the small magnetic block 1232 and the magnetic film is stronger, and the fixing effect is better.

[0060] 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, and can absorb the impact of the contact between the moving contact piece 401 and the safety protection pad 120 to achieve a buffering effect, preventing it from rebounding and causing electric sparks due to its position being too close to the static contact piece 402.

[0061] In one embodiment, the first push rod 500 abuts against the movable contact piece 401 .

[0062] In one embodiment, a first snap ring and a second snap ring are disposed at the bottom end of the second push rod 308 .

[0063] In one embodiment, a third retaining ring is disposed on the second push rod 308 to prevent the hard support 304 from falling off the second push rod 308 .

[0064] 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 .

[0065] In one of the embodiments, a memory spring 600 is provided on the positioning groove 201 of the fixed 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 up the top cover 301 when heated so that the top cover 301 always maintains 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.

[0066] In one embodiment, a mounting groove is opened on the top cover 301, and the mounting groove is inclined downward. The cup body 303 and the soft tray 302 are inserted into the mounting groove. When the top cover 301 is lifted, the cup body 303 and the soft tray 302 rise synchronously, thereby realizing precise heat conduction and ensuring the safety of the overall structure and precise temperature control.

[0067] In one embodiment, if Figure 1-10As shown, the safety magnetic steel temperature limiter comprises a main body bracket 100 and a heat conducting plate 3011, wherein the first mounting opening and the second mounting opening are respectively provided on both sides of the bottom end of the main body bracket 100, wherein the first mounting opening is provided with a static contact piece 402, and the second mounting opening is provided with a dynamic contact piece 401, wherein the static contact piece 402 abuts against the dynamic contact piece 401, and a mounting platform 110 is provided between the first mounting opening and the second mounting opening, wherein the mounting platform 110 is provided with a first through hole 111, wherein the first through hole 111 A first push rod 500 is provided inside, and the first push rod 500 is slidably connected with the first through hole 111, and one end of the first push rod 500 abuts against the moving contact piece 401. A fixing bracket 200 is provided at the top of the main body bracket 100, and a positioning groove 201 is provided in the middle of the fixing 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, and a first force member 304. 06 and a top cover 301, the top cover 301 is wrapped around the top 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 magnetic poles of the hard magnetic block 307 are arranged in an oppositely attracted manner, a second push rod 308 is arranged in the middle of the hard magnetic block 307, a center hole is arranged in the middle of the bottom end of the cup body 303, the second push rod 308 passes through the center hole, the first push rod 500 and the second push rod 308 are arranged in a oppositely attracted manner, and the second push rod 308 passes through the center hole. 08 are arranged correspondingly, one end of the first force member 306 is connected to the hard magnetic block 307, the other end of the first force member 306 is connected to the soft magnetic block 305, the bottom end of the second push rod 308 is provided with a first clamping ring and a second clamping ring, the top cover 301 is provided with a T-shaped clamping block 3013, the heat conducting plate 3011 is provided with a T-shaped groove 3012, the T-shaped clamping block 3013 is matched with the T-shaped groove 3012, and the heat conducting plate 3011 is provided with a plurality of heat conducting wires 3014. Specifically, the first force member 306 is a spring.

[0068] Specifically, by providing the soft magnetic block 305 and the hard magnetic block 307, the physical properties of the soft magnetic block 305 and the hard magnetic block 307 are utilized, the temperature-controlled product abuts against the heat-conducting plate 3011 and the heat-conducting wire 3014 to transfer the temperature to the top cover 301, and then transfer the temperature to the soft magnetic block 305. Under normal temperature, the hard magnetic block 307 and the soft magnetic block 305 are adsorbed, and when the temperature of the temperature-controlled product increases, the magnetism of the soft magnetic block 305 gradually weakens. When the temperature-controlled product reaches the specified temperature, the magnetism of the soft magnetic block 305 disappears, and the hard magnetic block 307 is separated from the soft magnetic block 305. Under the action of gravity, the hard magnetic block 307 falls in the vertical direction, and the hard magnetic block 307 is also moved. The second push rod 308 on 7 also descends until the second push rod 308 abuts against the first push rod 500, and then the first push rod 500 pushes the static contact piece 402 to separate from the dynamic contact piece 401, thereby cutting off the power supply and stopping heating; thereby achieving the purpose of temperature control; one end of the first force member 306 is connected to the hard magnetic block 307, and the other end of the first force member 306 is connected to the soft magnetic block 305. When the magnetic property of the soft magnetic block 305 is weakened, the first force member 306 can quickly drive the hard magnetic block 307 to fall quickly, so that the hard magnetic block 307, under the action of its own gravity and the thrust of the first force member 306, the second push rod 308 acts on the The force on the first push rod 500 can separate the moving contact piece 401 from the static contact piece 402; when the temperature of the external temperature control product decreases, the soft magnetic block 305 recovers its magnetism, the hard magnetic block 307 is 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 to start heating the external temperature control product. During use, a lever of a key switch can be inserted between the first clamp ring and the second clamp ring according to actual needs. The lever of the key switch prevents the hard magnetic block 307 from falling due to temperature changes, thereby continuously heating the external temperature control product and realizing multi-mode heating of the external temperature control product. The structure is simple and easy to use, the power supply is on and off smoothly, it is not prone to failure and has a long service life. Through the matching card connection form of the T-shaped block 3013 and the T-shaped groove 3012, the external temperature control product can be quickly replaced when the heat conducting plate 3011 is damaged due to long-term contact with the heat conducting plate 3011. In addition, the thermal wire 3014 on the heat conducting plate 3011 is in contact with the temperature control product. Since the thermal wire 3014 is small, when the temperature control product is in contact with the heat conducting plate 3011, the gap on the contact surface is filled by the thermal wire 3014, and the contact surface is always kept tightly matched, thereby avoiding the uneven contact surface caused by long-term contact between the temperature control product and the heat conducting plate 3011, resulting in poor heat conduction and failure to achieve precise temperature control.

[0069] In one embodiment, the magnetic steel temperature limiter body 300 also includes a soft support 302, one end of the soft support 302 is connected to the middle part of the top cover 301, and the other end of the soft support 302 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 retaining 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.

[0070] In one of the embodiments, a second through hole is provided in the middle of the hard magnetic block 307, a countersunk groove is provided on one end face of the second through hole, a second countersunk head is provided on one end of the second push rod 308, and the countersunk groove is matched with the countersunk head. Through the cooperation between the countersunk groove and the second countersunk head, the second push rod 308 will not separate from the second through hole during use.

[0071] 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 is in contact with the second silver contact 404. The resistance of silver itself is relatively small. When the stationary contact piece 402 is in contact with the moving contact piece 401 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.

[0072] In one of the embodiments, the top cover 301 is made of aluminum. Aluminum 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. The first push rod 500 and the second push rod 308 are both made of ceramic material. The ceramic material itself has poor conductivity, high hardness, and longer service life.

[0073] In one embodiment, a first mounting hole is provided at both ends of the fixing bracket 200, 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.

[0074] In one embodiment, the static contact piece 402 has a first extension block, and the dynamic contact piece 401 has a second extension block. The first extension block and the second extension block are both provided with a plurality of second mounting holes. The second mounting holes are fixed to the inner cavity of the main body bracket 100 by screws passing through the second mounting holes, and the locking is more secure.

[0075] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0076] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A durable rice cooker, characterized in that: include: Rice cooker body; An inner pot, wherein the inner pot is arranged in the electric rice cooker body, and a concave position is provided at the bottom of the inner pot; A magnetic steel temperature limiter, wherein the magnetic steel temperature limiter is embedded in the recessed position; The magnetic steel temperature limiter comprises: A fixing bracket, wherein a positioning groove is formed on the fixing bracket; and a magnetic steel temperature limiter body, wherein the magnetic steel temperature limiter body is installed in the positioning groove; and A memory spring, the memory spring is arranged in the positioning groove and connected to the magnetic steel temperature limiter body; The magnetic steel temperature limiter also includes 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 in the body bracket; a mounting platform is arranged in the body bracket, a first through hole is arranged on the mounting platform, the first push rod is slidably arranged in the first through hole, 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 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; A first buffer device is sleeved on the portion of the second push rod located between the cup body and the hard support, and the first buffer device includes an annular oblique spring, and the annular oblique spring is composed of an oblique spring and a nesting piece; a joint at one end and a joint at the other end of the oblique spring are mutually adaptive wedge joints, and 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 second buffer device is arranged on the inner wall of the bottom of the cup body, and the second buffer device is a conical ring, and the conical ring is made of a material with collision deformation energy absorption performance such as sponge or rubber; the outer wall of the second buffer device is in contact with the inner wall of the bottom of the cup body, and the larger diameter end of the conical ring is close to the bottom of the hard magnetic block; the conical inner wall of the second buffer device has a friction self-locking function; 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; 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, and 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 in the mounting platform; the first push rod abuts against the dynamic contact piece; a first snap ring and a second snap ring are provided at the bottom end of the second push rod; the memory spring is connected between the top cover and the positioning groove; 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; A shielding cavity is provided 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 provided at the bottom of the shielding cavity, the abutment portion is located above the safety protection pad, and when the first push rod drives the moving contact piece to disengage, the moving contact piece will abut against the safety protection pad; The safety protection pad includes a connecting convex strip and a receiving convex strip, wherein 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 downwardly inclined inclined surface, and 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-damping net is arranged on the upper surface of the receiving convex strip, and vibration-damping balls are evenly distributed at each node of the vibration-damping net, and vibration is absorbed by the vibration-damping balls. In addition, a plurality of circular pits are arranged on the contact surface of the receiving convex strip and the connecting convex strip, and 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. When the vibration-damping net is laid on the surface of the receiving convex strip, the vibration-damping balls will fall into the circular pits and rotate in the circular pits; The vibration-damping ball includes a sphere and small magnetic blocks. The sphere is made of elastic material, and the small magnetic blocks are embedded in the sphere. The small magnetic blocks are not located at the center of the sphere, but close to the surface of the sphere. When the vibration-damping ball is fixed on the vibration-damping net, the small magnetic blocks of the vibration-damping ball on the same vibration-damping net face the same direction. In addition, a magnetic film is also provided under the circular pit for installing the vibration-damping net. After the vibration-damping net is laid, the magnetic film will attract the small magnetic blocks in the vibration-damping ball.

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