Electric cooker sensor

Abstract

The electric cooker sensor comprises a main body, the top end of the main body is riveted to the inner side of the top of a heat conduction cover, the upper side of the main body is partially sleeved with the heat conduction cover, the main body is sleeved with a spring, the spring is arranged between the heat conduction cover and a mounting base, and the main body comprises a circular ring body at the top and a cuboid connected with the bottom of the circular ring body; a ceramic upper cover is arranged at the top end of the circular ring body, and a thermal fuse link assembly and a thermistor assembly are arranged on the cuboid. According to the invention, the thermistor and the thermal link are directly installed in the main body, the number of the thermal link is one or two according to needs, and the situation that an insulating sleeve wraps the thermistor and the thermal link and then a ceramic upper cover is fixed on the main body in the existing structure is canceled, so that the assembled product is ensured to meet the insulating property, the working procedures are simplified, and the production efficiency is improved. Assembly is convenient, firmness and reliability are achieved after assembly, and the material cost and the labor cost are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of temperature sensors, and in particular to an electric rice cooker sensor. Background Art

[0002] At present, in the home appliance industry, smart rice cookers that use negative temperature coefficient (NTC) thermistors as the bottom sensor structure have the characteristics of multi-function (such as cooking rice, porridge, steaming, stewing, soup, etc.) and intelligence (timing cooking, LED display, time setting, voice reminder, etc.). The thermistor uses NTC thermistors as temperature control and temperature detection, and the thermal fuse is used as a secondary over-temperature protection. Its working principle is to use the NTC thermistor under a certain measurement power, and the resistance value decreases rapidly as the temperature rises. Using this characteristic, the NTC thermistor can be used to determine the corresponding temperature by measuring its resistance value, thereby achieving the purpose of detecting and controlling the temperature. The thermal fuse is a secondary over-temperature protection component. When the temperature exceeds the rated temperature of the thermal fuse, the temperature pill inside the thermal fuse melts, disconnects the circuit, and protects the rice cooker from burning.

[0003] The sensor structure of rice cookers on the market is assembled by wrapping the thermistor and thermal fuse with an insulating sleeve. After the sleeve is assembled, an inner card is used to fix the thermistor assembly in the aluminum cover, and then an outer card is used to fix the thermal fuse assembly on the upper part of the aluminum cover. Since the working area of ​​the bottom sensor maintains a high temperature for a long time, and the insulating sleeve is made of plastic material, after a period of use, the insulating sleeve will age over time, and the insulation performance will decrease, which may cause leakage safety hazards. Therefore, how to optimize and improve the bottom sensor structure of the smart rice cooker to eliminate the leakage safety hazard is a technical problem that needs to be solved urgently. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an electric rice cooker sensor, which adopts a ceramic material as a main body, and a ceramic upper cover is placed on the main body as a heat conductive block, so as to improve the insulation performance and the thermal conductivity. At the same time, the insulating sleeve is eliminated, and the problem of insulation performance degradation will not occur under long-term working conditions, that is, there will be no safety hazard of leakage, which can improve the safety of the product and reduce the product cost.

[0005] To achieve the above object, the present invention provides an electric rice cooker sensor, comprising a heat conductive cover, a main body and a mounting base, wherein the top of the main body is riveted to the inner side of the top of the heat conductive cover, and the upper part of the main body is sleeved in the heat conductive cover, a spring is sleeved on the main body, and the spring is arranged between the heat conductive cover and the mounting base, the main body comprises a circular annular groove body at the top and a rectangular parallelepiped connected to the bottom of the circular annular groove body, a ceramic upper cover is arranged on the top of the circular annular groove body, and a thermal fuse assembly and a thermistor assembly are arranged on the rectangular parallelepiped.

[0006] As a further improvement of the present technical solution, the thermal fuse assembly includes two thermal fuses, and the surface of the rectangular body is located in the annular groove body and has two first placement grooves with oblong hole shapes symmetrically opened. A thermal fuse is installed in each of the first placement grooves. The rectangular body is located at the bottom of the first placement groove at both ends and has first cylindrical holes respectively opened, and the first cylindrical holes are connected to the first placement grooves. A first connecting copper sleeve is provided in the first cylindrical hole, and the top and bottom of the first connecting copper sleeve are connected to the thermal fuse wire, and the top of the first connecting copper sleeve is connected to one end of the thermal fuse through the thermal fuse wire, and the bottom of the first connecting copper sleeve is connected to the terminal sleeve through the thermal fuse wire.

[0007] As a further improvement of the present technical solution, the thermal fuse assembly includes a thermal fuse, and the surface of the rectangular body is located in a circular groove body and has two first placement grooves with oblong hole-shaped cross-sections symmetrically opened, and the thermal fuse is installed in one of the first placement grooves, and the rectangular body is located at the bottom of both ends of the first placement groove and has first cylindrical holes respectively opened, and the first cylindrical holes are connected to the first placement groove, and a first connecting copper sleeve is provided in the first cylindrical hole, and the top and bottom of the first connecting copper sleeve are connected to the thermal fuse wire, and the top of the first connecting copper sleeve is connected to one end of the thermal fuse through the thermal fuse wire, and the bottom of the first connecting copper sleeve is connected to the terminal sleeve through the thermal fuse wire.

[0008] As a further improvement of the present technical solution, the thermistor assembly includes a thermistor, a second placement groove with a long circular hole-shaped cross-section is provided on the surface of the rectangular parallelepiped between the two first placement grooves, the second placement groove is installed with a thermistor, the rectangular parallelepiped has second cylindrical holes at the bottom of both ends of the second placement groove, and the second cylindrical hole is connected to the second placement groove, a second connecting copper sleeve is provided in the second cylindrical hole, the top and bottom of the second connecting copper sleeve are connected to thermistor wires, and the top of the second connecting copper sleeve is connected to one end of the thermistor through the thermistor wire, and the bottoms of the two second connecting copper sleeves are connected to the connector through thermistor wires.

[0009] As a further improvement of the present technical solution, the heat-conductive cover comprises an upper cylinder and a lower cylinder connected up and down, wherein the diameter of the upper cylinder is smaller than that of the lower cylinder, the main body is arranged in the lower cylinder, and the top end of the spring extends to the bottom of the connection part between the lower cylinder and the upper cylinder and contacts therewith.

[0010] As a further improvement of the technical solution, a through opening is opened in the middle of the mounting base, a thermal fuse wire and a thermistor wire pass through the through opening, a limiting groove for resisting the lower end of the spring is connected to the through opening, openings are connected on both sides of the through opening, and an inverted L-shaped clamping plate is vertically connected to the side of the opening away from the through opening.

[0011] As a further improvement of the technical solution, a connecting plate is connected around the lower cylindrical body of the heat-conducting cover, and the connecting plate is symmetrically provided with two limiting holes that are clamped with the top end of the clamping plate.

[0012] As a further improvement of the technical solution, an I-shaped groove for heat dissipation is provided at the bottom of the rectangular parallelepiped, and two of the second cylindrical holes are arranged on both sides of the I-shaped groove of the rectangular parallelepiped.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The present invention directly installs the thermistor and the thermal fuse in the main body, wherein the number of the thermal fuses is set to one or two as required, and eliminates the insulating sleeve that wraps the thermistor and the thermal fuse in the existing structure. The ceramic cover is then fixed to the main body, thereby ensuring that the assembled product meets the insulation performance requirements. In addition, the main body is made of ceramic material, and the ceramic cover is placed on the main body as a heat conductive block, thereby solving the problem of insulation performance degradation and leakage safety hazards caused by long-term operation, improving insulation performance, and improving electricity safety.

[0015] (2) The present invention eliminates the use of insulating sleeves, simplifies the process, facilitates assembly, is firm and reliable after assembly, and reduces material and labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 This is a three-dimensional diagram of the ceramic structure of the rice cooker sensor according to the first embodiment of the present invention.

[0018] Figure 2 This is an exploded view of the ceramic structure of the rice cooker sensor according to the first embodiment of the present invention.

[0019] Figure 3 It is a three-dimensional diagram of the main body of the first embodiment of the present invention.

[0020] Figure 4 It is a three-dimensional diagram of a main body with a thermal fuse assembly and a thermistor assembly installed according to the first embodiment of the present invention.

[0021] Figure 5 It is a three-dimensional diagram of a main body with a thermal fuse assembly and a thermistor assembly installed according to the second embodiment of the present invention.

[0022] The accompanying drawings are marked as follows: heat-conducting cover 1, upper cylinder 101, lower cylinder 102, main body 2, annular groove body 201, rectangular parallelepiped 202, mounting base 3, spring 4, ceramic upper cover 5, thermal fuse 6, thermistor 7, first placement groove 8, second placement groove 9, first cylindrical hole 10, second cylindrical hole 11, first connecting copper sleeve 12, second connecting copper sleeve 13, thermal fuse wire 14, thermistor wire 15, terminal sleeve 16, connector 17, through port 18, limit groove 19, clamping plate 20, connecting plate 21, limit hole 22. DETAILED DESCRIPTION

[0023] 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 intended to be used to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0024] In the description of the embodiments of the present invention, it should be understood that if there are directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, inside, outside, etc., the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] In the embodiments of the present invention, unless otherwise clearly specified and limited, if there are terms such as "installed", "connected", "connected", "fixed", etc., they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection. It can be a mechanical connection or an electrical 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.

[0027] Embodiment 1

[0028] like Figures 1 to 4As shown, the present embodiment provides an electric cooker sensor, comprising a heat-conducting cover 1, a main body 2 and a mounting base 3, wherein the top of the main body 2 is riveted to the inner side of the top of the heat-conducting cover 1, and the upper part of the main body 2 is sleeved in the heat-conducting cover 1, and a spring 4 is sleeved on the main body 2, and the spring 4 is arranged between the heat-conducting cover 1 and the mounting base 3, the main body 2 comprises a circular annular groove body 201 at the top and a cuboid 202 connected to the bottom of the circular annular groove body 201, a ceramic upper cover 5 is arranged on the top of the circular annular groove body 201, and a thermal fuse assembly and a thermistor assembly are arranged on the cuboid 202.

[0029] In this embodiment, the thermal fuse assembly includes two thermal fuses 6. The surface of the rectangular body 202 is located in the annular groove body 201 and has two first placement grooves 8 symmetrically opened with a cross-section in the shape of an oblong hole. A thermal fuse 6 is installed in each first placement groove 8. The rectangular body 202 is located at the bottom of the first placement groove 8 at both ends and has first cylindrical holes 10 respectively opened. The first cylindrical holes 10 are connected to the first placement grooves 8. A first connecting copper sleeve 12 is provided in the first cylindrical hole 10. The top and bottom of the first connecting copper sleeve 12 are connected to the thermal fuse wire 14, and the top of the first connecting copper sleeve 12 is connected to one end of the thermal fuse 6 through the thermal fuse wire 14, and the bottom of the first connecting copper sleeve 12 is connected to the terminal sleeve 16 through the thermal fuse wire 14.

[0030] Specifically, the thermal fuse 6 is connected to the terminal sheath 16 through the thermal fuse wire 14 and the first connecting copper sleeve 12 to form a thermal fuse assembly.

[0031] In this embodiment, the thermistor assembly includes a thermistor 7, and a second placement groove 9 with a long circular hole-shaped cross-section is opened on the surface of the rectangular parallelepiped 202 between the two first placement grooves 8, and the second placement groove 9 is installed with the thermistor 7. The rectangular parallelepiped 202 is located at the bottom of both ends of the second placement groove 9 and has second cylindrical holes 11, and the second cylindrical holes 11 are connected to the second placement groove 9. A second connecting copper sleeve 13 is provided in the second cylindrical hole 11, and the top and bottom of the second connecting copper sleeve 13 are connected to the thermistor wire 15, and the top of the second connecting copper sleeve 13 is connected to one end of the thermistor 7 through the thermistor wire 15, and the bottoms of the two second connecting copper sleeves 13 are connected to the connector 17 through the thermistor wire 15.

[0032] Specifically, the thermistor 7 is connected to the connector 17 through the thermistor wire 15 and the second connecting copper sleeve 13 to form a thermistor assembly.

[0033] In this embodiment, the heat-conducting cover 1 includes an upper cylinder 101 and a lower cylinder 102 connected up and down, wherein the upper cylinder 101 has a smaller diameter than the lower cylinder 102, the main body 2 is arranged in the lower cylinder 102, and the top end of the spring 4 extends to the bottom of the connection between the lower cylinder 102 and the upper cylinder 101 and contacts therewith.

[0034] In this embodiment, a through hole 18 is opened in the middle of the mounting base 3, and the thermal fuse wire 14 and the thermistor wire 15 pass through the through hole 18. The through hole 18 is connected to a limit groove 19 for resisting the lower end of the spring 4. Both sides of the through hole 18 are connected to openings, and an inverted L-shaped clamping plate 20 is vertically connected to the side of the opening away from the through hole 18.

[0035] Specifically, the top of the spring is limited to the connection portion between the lower cylinder 102 and the upper cylinder 101 of the heat-conducting cover, and the bottom is limited to the limiting groove 19 .

[0036] In this embodiment, a connecting plate 21 is connected around the lower cylindrical body 102 of the heat-conducting cover 1 , and the connecting plate 21 is symmetrically provided with two limiting holes 22 that are engaged with the top end of the clamping plate 20 .

[0037] Specifically, the top end of the clamping plate 20 of the mounting base 3 is clamped in the limiting hole 22 of the heat-conducting cover 1 , so that the mounting base 3 is fixedly connected to the heat-conducting cover 1 .

[0038] In this embodiment, an I-shaped groove 23 for heat dissipation is provided at the bottom of the cuboid 202 , and two second cylindrical holes 11 are provided on the cuboid 202 at two sides of the I-shaped groove 23 .

[0039] The sensor ceramic structure installation process of the present invention is as follows:

[0040] Step 1: Design the ceramic upper cover 5 into a circular structure, the ceramic upper cover 5 is designed into two steps, the smaller side of the step is fixed with the upper part of the main body 2, the upper part of the main body 2 is designed as a circular groove 201, and the lower part is designed as a rectangular parallelepiped 202. The top surface of the rectangular parallelepiped 202 is located in the circular groove 201 and is designed with two large and one small placement grooves, which are mainly used to place the thermal fuse 6 and thermistor 7. A cylindrical hole connected to the placement groove is provided inside the rectangular parallelepiped 202, which is mainly used to place the thermistor wire 15 and the thermal fuse wire 14;

[0041] Step 2: The thermistor wire 15 is inserted into the corresponding cylindrical hole, and the thermal fuse wire 14 is also inserted into the corresponding cylindrical hole. The thermal fuse wire 14 is connected to the thermal fuse 6 by the first connecting copper sleeve 12, and the thermistor wire 15 is connected to the thermistor by the second connecting copper sleeve 13. After the thermistor 7 and the thermal fuse 6 are bent, they are respectively installed in the placement grooves of the main body 2 and fixed;

[0042] Step 3: Fix the ceramic upper cover 5 on the main body 2 and rivet it to the thermal conductive cover 1, then put the spring 4 on the main body 2, and then pass the thermistor wire 15 and the thermal fuse wire 14 through the through-hole 18 of the mounting base 3, and finally clamp the top of the clamping plate 20 of the mounting base 3 into the limiting hole 22 of the thermal conductive cover 1, so that the mounting base 3 is fixedly connected to the thermal conductive cover 1, and a sensor ceramic structure is assembled.

[0043] Embodiment 2

[0044] This embodiment provides a rice cooker sensor, which is different from the first embodiment in that: Figure 5 As shown, the thermal fuse assembly includes a thermal fuse 6, and the surface of the rectangular body 202 is located in the annular groove body 201 and has two first placement grooves 8 symmetrically opened with a cross-section in the shape of an oblong hole, wherein the thermal fuse 6 is installed in one of the first placement grooves 8, and the rectangular body 202 is located at the bottom of both ends of the first placement groove 8 and has first cylindrical holes 10 respectively opened, and the first cylindrical holes 10 are connected to the first placement groove 8, and a first connecting copper sleeve 12 is arranged in the first cylindrical hole 10, and the top and bottom of the first connecting copper sleeve 12 are connected to the thermal fuse wire 14, and the top of the first connecting copper sleeve 12 is connected to one end of the thermal fuse 6 through the thermal fuse wire 14, and the bottom of the first connecting copper sleeve 12 is connected to the terminal sleeve 16 through the thermal fuse wire 14.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rice cooker sensor, comprising a heat-conducting cover (1), a main body (2) and a mounting base (3), characterized in that: The top of the main body (2) is riveted to the inner side of the top of the heat-conducting cover (1), and the upper part of the main body (2) is sleeved in the heat-conducting cover (1). A spring (4) is sleeved on the main body (2), and the spring (4) is arranged between the heat-conducting cover (1) and the mounting base (3). The main body (2) comprises a circular groove body (201) at the top and a rectangular parallelepiped (202) connected to the bottom of the circular groove body (201). A ceramic upper cover (5) is arranged at the top of the circular groove body (201), and a thermal fuse assembly and a thermistor assembly are arranged on the rectangular parallelepiped (202).

2. The rice cooker sensor according to claim 1, characterized in that: The thermal fuse assembly comprises two thermal fuses (6). The surface of the rectangular parallelepiped (202) is symmetrically provided with two first placement grooves (8) with a cross-section in the shape of an oblong hole in the annular groove body (201). A thermal fuse (6) is installed in each of the first placement grooves (8). The rectangular parallelepiped (202) is provided with first cylindrical holes (10) at the bottoms of both ends of the first placement grooves (8), and the first cylindrical holes (10) are connected to the first placement grooves (8). A first connecting copper sleeve (12) is provided in the first cylindrical hole (10). The top and bottom of the first connecting copper sleeve (12) are both connected to the thermal fuse wire (14), and the top of the first connecting copper sleeve (12) is connected to one end of the thermal fuse (6) through the thermal fuse wire (14), and the bottom of the first connecting copper sleeve (12) is connected to the terminal sleeve (16) through the thermal fuse wire (14).

3. The rice cooker sensor according to claim 1, characterized in that: The thermal fuse assembly comprises a thermal fuse (6), and two first placement grooves (8) with a cross-section in the shape of an oblong hole are symmetrically provided on the surface of the rectangular parallelepiped (202) located in the annular groove body (201), wherein the thermal fuse (6) is installed in one of the first placement grooves (8), and first cylindrical holes (10) are respectively provided at the bottom of both ends of the first placement groove (8) of the rectangular parallelepiped (202), and the first cylindrical holes (10) are connected to the first placement groove (8), and a first connecting copper sleeve (12) is provided in the first cylindrical hole (10), and the top and bottom of the first connecting copper sleeve (12) are both connected to the thermal fuse wire (14), and the top of the first connecting copper sleeve (12) is connected to one end of the thermal fuse (6) through the thermal fuse wire (14), and the bottom of the first connecting copper sleeve (12) is connected to the terminal sleeve (16) through the thermal fuse wire (14).

4. The rice cooker sensor according to claim 1, characterized in that: The thermistor assembly comprises a thermistor (7); a second placement groove (9) having a cross-section in the shape of an oblong hole is provided on the surface of the rectangular parallelepiped (202) between two first placement grooves (8); the thermistor (7) is installed in the second placement groove (9); second cylindrical holes (11) are provided at the bottoms of both ends of the second placement groove (9) on the rectangular parallelepiped (202); the second cylindrical holes (11) are connected to the second placement groove (9); a second connecting copper sleeve (13) is provided in the second cylindrical hole (11); the top and bottom of the second connecting copper sleeve (13) are both connected to thermistor wires (15); the top of the second connecting copper sleeve (13) is connected to one end of the thermistor (7) via the thermistor wire (15); and the bottoms of the two second connecting copper sleeves (13) are connected to a connector (17) via the thermistor wires (15).

5. The rice cooker sensor according to claim 1, characterized in that: The heat-conducting cover (1) comprises an upper cylinder (101) and a lower cylinder (102) which are connected to each other, wherein the diameter of the upper cylinder (101) is smaller than that of the lower cylinder (102), the main body (2) is arranged in the lower cylinder (102), and the top end of the spring (4) extends to the bottom of the connection between the lower cylinder (102) and the upper cylinder (101) and contacts therewith.

6. A rice cooker sensor according to any one of claims 2 to 4, characterized in that: A through opening (18) is provided in the middle of the mounting base (3), a thermal fuse wire (14) and a thermistor wire (15) pass through the through opening (18), a limiting groove (19) for resisting the lower end of the spring (4) is connected to the through opening (18), both sides of the through opening (18) are connected to openings, and a side of the opening away from the through opening (18) is vertically connected to an inverted L-shaped clamping plate (20).

7. A rice cooker sensor according to claim 5 or 6, characterized in that: A connecting plate (21) is connected around the lower cylindrical body (102) of the heat-conducting cover (1), and the connecting plate (21) is symmetrically provided with two limiting holes (22) that are clamped with the top end of the clamping plate (20).

8. The rice cooker sensor according to claim 4, characterized in that: The bottom of the rectangular parallelepiped (202) is provided with an I-shaped groove (23) for heat dissipation, and the two second cylindrical holes (11) are arranged on the rectangular parallelepiped (202) at both sides of the I-shaped groove (23).

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