Gland sensor

Abstract

The gland sensor comprises a mounting bottom plate, a small cup, a heat conduction cover, a spring, a clamping pin, a clamping hole, a heat conduction plate, a thermistor and a working part. The thermistor is adopted to replace traditional magnetic steel to serve as a temperature sensing element, temperature limiting control can be achieved by directly connecting the thermistor with a working circuit, the situation that the sensor loses efficacy due to magnetic loss of the magnetic steel is avoided, and the reliability of the sensor is improved; meanwhile, the structure of an outer cup and an inner cup of a traditional sensor does not need to be changed, and cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliance sensors, and particularly to a gland sensor. Background Art

[0002] Traditional rice cooker sensors usually use a magnetic steel suction device as a switch to limit the temperature and control the heating of the rice cooker; this magnetic steel suction device has high requirements for the performance of the magnetic steel, and when the magnetic steel is used for a long time, its magnetism will decrease due to various reasons, resulting in the entire magnetic steel suction device being unable to work and the sensor failing. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides a gland sensor to meet the needs of actual production.

[0004] The technical solution of the present invention is: a gland sensor, including a mounting base plate, a small cup and a heat-conducting cover connected in sequence from bottom to top. A spring is sleeved on the outer circle of the small cup. One end of the spring is in close contact with the bottom of the heat-conducting cover, and the other end of the spring is in close contact with the mounting base plate. A plurality of card feet are fixedly connected to the bottom of the small cup, and card holes matching the card feet are provided on the mounting base plate. A heat-conducting plate is clamped between the heat-conducting cover and the small cup. The heat-conducting plate is in close contact with the heat-conducting cover, and a thermistor is provided between the heat-conducting cover and the heat-conducting plate. The thermistor is connected to a working circuit.

[0005] Further, the mounting base plate is provided with mounting holes, and a plurality of limiting ears are symmetrically distributed on one side of the mounting base plate close to the heat-conducting cover.

[0006] Further, a plurality of connecting ears are symmetrically distributed on the side of the mounting base plate facing away from the heat-conducting cover, and a ground wire is connected to one of the connecting ears.

[0007] Further, one of the connecting ears is a wiring terminal, which is convenient for connecting the ground wire.

[0008] Further, the mounting base plate is provided with an annular groove, the card feet are arranged on the annular groove, and the bottom of the small cup is located inside the annular groove.

[0009] Further, the heat-conducting plate is provided with an arc-shaped groove, the thermistor is located inside the arc-shaped groove, the heat-conducting plate is further provided with a notch, a limiting plate is fixedly connected to the bottom of the notch, and two clamping plates are provided at one end of the limiting plate facing away from the heat-conducting plate. The two clamping plates are arc-shaped to fix the leads of the thermistor.

[0010] Further, the limiting plate and the heat-conducting plate are integrally formed.

[0011] Further, the top of the small cup is in an inverted cone shape, the outer diameter of the heat conduction plate is not less than the diameter of the top of the small cup. After the heat conduction cover presses the heat conduction plate on the top of the small cup, the lower part of the heat conduction cover will shrink into the inverted cone-shaped bottom of the small cup.

[0012] Further, a bimetal sheet is connected to the bottom of the heat conduction plate, a moving contact is fixedly connected to the bimetal sheet, a mounting plate is fixedly connected to the bottom of the small cup, a static contact that contacts the moving contact is fixedly connected to the mounting plate, the static contact and the bimetal sheet are respectively connected to the positive and negative electrodes of the battery, the static contact and the bimetal sheet are both connected to the control circuit of the relay, the main circuit of the relay is connected to the working circuit, and the relay and the thermistor are connected in series in the working circuit.

[0013] Further, the mounting plate includes a horizontal plate, a vertical plate and a limiting plate connected in sequence. The small cup, the horizontal plate, the vertical plate and the limiting plate are bent at the joints after laser cutting. A through hole is provided on the limiting plate, a rubber sleeve is in clearance fit with the through hole, and the static contact is in clearance fit with the inside of the rubber sleeve. The bimetal sheet is fixedly connected to the bottom of the heat conduction plate through a heat-conducting silica gel sheet.

[0014] Further, two heat-conducting silica gel sheets are symmetrically arranged at the bottom of the heat conduction plate. Two bimetal sheets are symmetrically distributed on one heat-conducting silica gel sheet. The four bimetal sheets are connected by a first wire. Three vertical plates are symmetrically arranged. Two limiting plates are provided on one of the vertical plates. A conductive plate is provided at one end of each static contact away from the moving contact. The four conductive plates are connected by a second wire.

[0015] Further, the first wire is connected to the bimetal sheet by soldering.

[0016] Further, the parts of the second wire and the first wire passing through the small cup are connected by a tie strap. The part of the second wire for connecting the four conductive plates is a core wire, and the core wire connects the four conductive plates through holes passing through the four conductive plates.

[0017] Compared with the prior art, the advantages of the present invention are as follows: The present invention uses a thermistor instead of a traditional magnetic steel as the temperature sensing element, and the temperature limit control can be realized by directly connecting the thermistor to the working circuit, eliminating the situation that the sensor fails due to the demagnetization of the magnetic steel that is likely to occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 Schematic diagram of the overall structure of the present invention;

[0020] Figure 2 Exploded view of the overall structure of an embodiment of the present invention;

[0021] Figure 3 Partial sectional view of another embodiment of the present invention;

[0022] Figure 4 is Figure 3 Schematic diagram of the connection structure of the first wire and the second wire in the embodiment.

[0023] Wherein: 1, heat-conducting cover; 2, small cup; 3, terminal; 4, connecting ear; 5, thermistor; 6, mounting base plate; 7, limiting ear; 8, spring; 9, annular groove; 10, mounting hole; 11, heat-conducting plate; 12, arc-shaped groove; 13, notch; 14, clamping plate; 15, first wire; 16, bimetallic strip; 17, limiting plate; 18, vertical plate; 19, horizontal plate; 20, mounting plate; 21, second wire; 22, conductive plate; 23, static joint; 24, moving joint; 25, rubber sleeve; 26, heat-conducting silica gel sheet; 27, cable tie. Detailed implementation manners

[0024] To make the objectives, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0025] The following will describe the detailed implementation manners of the present invention in conjunction with the drawings:

[0026] Such as Figures 1 to 4As shown in the figure, a gland sensor includes a mounting base plate 6, a small cup 2, and a heat-conducting cover 1 connected in sequence from bottom to top. A spring 8 is sleeved on the outer circle of the small cup 2. One end of the spring 8 is in close contact with the bottom of the heat-conducting cover 1, and the other end of the spring 8 is in close contact with the mounting base plate 6. A plurality of clamping feet are fixedly connected to the bottom of the small cup 2, and card holes for cooperating with the clamping feet are provided on the mounting base plate 6. A heat-conducting plate 11 is clamped between the heat-conducting cover 1 and the small cup 2. The heat-conducting plate 11 is in close contact with the heat-conducting cover 1, and a thermistor 5 is provided between the heat-conducting cover 1 and the heat-conducting plate 11. The thermistor 5 is connected to a working circuit. Therefore, in the present invention, the thermistor 5 is used instead of the traditional magnetic steel as the temperature-sensing element. By directly connecting the thermistor 5 to the working circuit, temperature limit control can be achieved, and the situation of sensor failure caused by magnetic steel demagnetization will not occur, improving the reliability of the sensor. At the same time, it is not necessary to change the structures of the outer cup and the inner cup of the traditional sensor, saving costs.

[0027] In this embodiment, mounting holes 10 are provided on the mounting base plate 6 to facilitate the installation of the mounting base plate 6. It only needs to pass bolts through the mounting holes 10 and tighten them. A plurality of limiting ears 7 are symmetrically distributed on one side of the mounting base plate 6 close to the heat-conducting cover 1, which is convenient for the quick positioning of the mounting base plate 6. It can improve the installation quality of the mounting base plate 6 while improving the installation efficiency. A plurality of connecting ears 4 are symmetrically distributed on the side of the mounting base plate 6 facing away from the heat-conducting cover 1. A ground wire is connected to one of the connecting ears 4. When a fault occurs in the equipment, it can effectively guide the fault current and protect the equipment from damage. It provides a safe tripping path, enabling the protection device to act in time when overloaded or short-circuited, cutting off the power supply, and avoiding greater damage to the equipment. One of the connecting ears 4 is a wiring terminal 3, which is convenient for connecting the ground wire. An annular groove 9 is provided on the mounting base plate 6. The clamping feet are arranged on the annular groove 9, and the bottom of the small cup 2 is located inside the annular groove 9, which is convenient for the installation of the spring 8 and is conducive to the dislocation of the spring 8. An arc-shaped groove 12 is provided on the heat-conducting plate 11, and the thermistor 5 is located inside the arc-shaped groove 12, which is convenient for the installation of the thermistor 5. A notch 13 is also provided on the heat-conducting plate 11. A limiting plate 17 is fixedly connected to the bottom of the notch 13. Two clamping plates 14 are provided at one end of the limiting plate 17 facing away from the heat-conducting plate 11. The two clamping plates 14 are arc-shaped to fix the leads of the thermistor 5, thereby preventing the thermistor 5 from shaking when moving and ensuring the stability of the connection of the thermistor 5. The limiting plate 17 is integrally formed with the heat-conducting plate 11, reducing costs and facilitating the installation of the limiter. The top of the small cup 2 is in an inverted cone shape. The outer diameter dimension of the heat-conducting plate 11 is not less than the top diameter dimension of the small cup 2. After the heat-conducting cover 1 presses the heat-conducting plate 11 on the top of the small cup 2, the lower part of the heat-conducting cover 1 will shrink into the inverted cone-shaped bottom of the small cup 2, thereby realizing the clamping of the heat-conducting plate 11. The materials of the heat-conducting plate 11 and the heat-conducting cover 1 can both be made of aluminum materials.

[0028] In other embodiments, a bimetal 16 is connected to the bottom of the heat conducting plate 11. A moving joint 24 is fixedly connected to the bimetal 16. A mounting plate 20 is fixedly connected to the bottom of the small cup 2. A static joint 23 in contact with the moving joint 24 is fixedly connected to the mounting plate 20. The static joint 23 and the bimetal 16 are respectively connected to the positive and negative electrodes of the battery. The static joint 23 and the bimetal 16 are both connected to the control circuit of the relay. The main circuit of the relay is connected to the working circuit, and the relay and the thermistor 5 are connected in series in the working circuit. Therefore, when the thermistor 5 is in poor contact with the heat conducting cover 1, that is, the temperature of the heat conducting cover 1 cannot be accurately recognized. At this time, the bimetal 16 is deformed under the high temperature of the heat conducting cover 1, so that the moving joint 24 and the static joint 23 are in contact, so that the control circuit of the relay is powered on. At this time, the relay will disconnect the working circuit. Thus, the rice cooker does not heat up, which protects the normal use of the product. The mounting plate 20 includes a horizontal plate 19, a vertical plate 18 and a limiting plate 17 connected in sequence. The small cup 2, the horizontal plate 19, the vertical plate 18 and the limiting plate 17 are bent at the joints after laser cutting. A through hole is provided on the limiting plate 17. A rubber sleeve 25 is fitted in the through hole with a clearance. The static joint 23 is fitted in the rubber sleeve 25 with a clearance. The bimetal 16 is fixedly connected to the bottom of the heat conducting plate 11 through a heat conducting silica gel sheet 26, so as to prevent the current in the control circuit from flowing into the small cup 2 and the mounting bottom plate 6, and prevent the occurrence of electric leakage. Two heat conducting silica gel sheets 26 are symmetrically arranged at the bottom of the heat conducting plate 11. Two bimetal 16 are symmetrically distributed on one heat conducting silica gel sheet 26. The four bimetal 16 are connected by a first wire 15. Three vertical plates 18 are symmetrically arranged. Two limiting plates 17 are provided on one of the vertical plates 18. A conductive plate 22 is provided at one end of each static joint 23 away from the moving joint 24. The four conductive plates 22 are connected by a second wire 21. Through four moving and static contact points, the limiting quality of the limiter is guaranteed, and the accurate power-off of the limiter is ensured. The first wire 15 is connected to the bimetal 16 by soldering. The parts of the second wire 21 and the first wire 15 passing through the small cup 2 are connected by a tie strap 27. The part of the second wire 21 for connecting the four conductive plates 22 is a core wire. The core wire connects the four conductive plates 22 through the holes penetrating the four conductive plates 22, which is convenient for the installation of the limiter structure.

[0029] Working principle: The present invention uses a thermistor 5 to replace the traditional magnetic steel as the temperature sensing element. By directly connecting the thermistor 5 to the working circuit, the temperature limit control can be realized, and the situation that the sensor fails due to the demagnetization of the magnetic steel will not occur, improving the reliability of the sensor. At the same time, it is not necessary to change the structures of the outer cup and the inner cup of the traditional sensor, saving costs.

[0030] 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 "upper", "lower", "left", "right", "front", "rear" and similar expressions used herein are for illustrative purposes only.

[0031] The above are only the preferred embodiments of the present invention, and do not impose any formal limitations on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the technical content disclosed above within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A gland sensor, characterized in that: The invention comprises a mounting base plate (6), a small cup (2) and a heat-conducting cover (1) which are connected in sequence from bottom to top; a spring (8) is sleeved on the outer circle of the small cup (2); one end of the spring (8) is in close contact with the bottom of the heat-conducting cover (1); the other end of the spring (8) is in close contact with the mounting base plate (6); a plurality of clamping feet are fixedly connected to the bottom of the small cup (2); a clamping hole matching the clamping feet is provided on the mounting base plate (6); a heat-conducting plate (11) is clamped between the heat-conducting cover (1) and the small cup (2); the heat-conducting plate (11) is in close contact with the heat-conducting cover (1); a thermistor (5) is provided between the heat-conducting cover (1) and the heat-conducting plate (11); and the thermistor (5) is connected to a working circuit.

2. The gland sensor according to claim 1, characterized in that: The mounting base plate (6) is provided with a mounting hole (10), and a plurality of limiting ears (7) are symmetrically distributed on one side of the mounting base plate (6) close to the heat-conducting cover (1).

3. The gland sensor according to claim 1, characterized in that: A plurality of connection ears (4) are symmetrically distributed on one side of the installation base plate (6) facing away from the heat-conducting cover (1), and a ground wire is connected to one of the connection ears (4).

4. The gland sensor according to claim 1, characterized in that: An annular groove (9) is provided on the mounting base plate (6), the clamping foot is provided on the annular groove (9) and the bottom of the small cup (2) is located inside the annular groove (9).

5. The gland sensor according to claim 1, characterized in that: The heat conducting plate (11) is provided with an arc-shaped groove (12), the thermistor (5) is located inside the arc-shaped groove (12), the heat conducting plate (11) is also provided with a notch (13), the bottom of the notch (13) is fixedly connected to a limiting plate (17), and the end of the limiting plate (17) facing away from the heat conducting plate (11) is provided with two clamping plates (14), and the two clamping plates (14) are in an arc shape so as to fix the lead wire of the thermistor (5).

6. The gland sensor according to claim 1, characterized in that: The top of the small cup (2) is in the shape of an inverted cone, the outer diameter of the heat conducting plate (11) is not less than the diameter of the top of the small cup (2), and after the heat conducting cover (1) presses the heat conducting plate (11) onto the top of the small cup (2), the lower part of the heat conducting cover (1) will shrink into the inverted cone-shaped bottom of the small cup (2).

7. The gland sensor according to claim 1, characterized in that: The bottom of the heat conducting plate (11) is connected to a bimetallic strip (16), a movable joint (24) is fixedly connected to the bimetallic strip (16), the bottom of the small cup (2) is fixedly connected to a mounting plate (20), a static joint (23) in contact with the movable joint (24) is fixedly connected to the mounting plate (20), the static joint (23) and the bimetallic strip (16) are respectively connected to the positive and negative electrodes of a battery, the static joint (23) and the bimetallic strip (16) are both connected to a control circuit of a relay, the main circuit of the relay is connected to the working circuit, and the relay and the thermistor (5) are connected in series to the working circuit.

8. The gland sensor according to claim 7, characterized in that: The mounting plate (20) comprises a transverse plate (19), a vertical plate (18) and a limiting plate (17) which are connected in sequence; the small cup (2), the transverse plate (19), the vertical plate (18) and the limiting plate (17) are formed by bending at the connection after laser cutting; a through hole is provided on the limiting plate (17); a rubber sleeve (25) is fitted in the gap on the through hole; the static joint (23) is fitted in the internal gap of the rubber sleeve (25); the bimetallic strip (16) is fixed to the bottom of the heat conducting plate (11) through a heat conducting silicone sheet (26).

9. The gland sensor according to claim 8, characterized in that: Two thermally conductive silicone sheets (26) are symmetrically arranged at the bottom of the thermally conductive plate (11), two bimetallic sheets (16) are symmetrically distributed on one thermally conductive silicone sheet (26), and the four bimetallic sheets (16) are connected by a first electric wire (15). Three vertical plates (18) are symmetrically arranged, and two limit plates (17) are arranged on one of the vertical plates (18). A conductive plate (22) is arranged at one end of each static joint (23) away from the dynamic joint (24), and the four conductive plates (22) are connected by a second electric wire (21).

10. The gland sensor according to claim 9, characterized in that: The second electric wire (21) and the first electric wire (15) are connected via a cable tie (27) at the portion passing through the small cup (2). The portion of the second electric wire (21) used to connect the four conductive plates (22) is a core wire, and the core wire connects the four conductive plates (22) by passing through holes in the four conductive plates (22).

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