Overheat protection device for electric heating of electric appliance

Abstract

The overheating protection device comprises a kettle body, a sliding groove is formed in the position, close to the bottom end, of the kettle body, a fixing rod is inserted between the top wall and the bottom wall of the sliding groove in a penetrating mode, a bearing box is rotationally connected to the outside of the fixing rod, absorbent cotton is placed in the bearing box, and a sliding block is installed on the outer side wall of the bearing box. A limiting block is fixedly installed at the position, close to the bottom end, of the kettle body, a hollow column is inserted into the kettle body, the hollow column is inserted into the top wall of the sliding groove from an inner cavity of the kettle body, the hollow column is located above the absorbent cotton, when water in the kettle body boils, more bubbles can be generated, and therefore the liquid level rises, and when the liquid level is higher than the hollow column, liquid flows out along the hollow column. At the moment, the liquid is absorbed by the absorbent cotton, the sliding block is moved upwards, then the sliding block is pulled, the sliding block drives the bearing box to rotate around the fixing rod, the absorbent cotton in the bearing box can be taken out and replaced, the bearing box rotates reversely to the original position after replacement is completed, then the fixing block slides downwards into the limiting block, and the bearing box is prevented from moving freely.

Description

Technical Field

[0001] The utility model relates to the field of overheat protection equipment, in particular to an overheat protection device for electric heating of an electrical appliance. Background Art

[0002] An electric kettle is a household appliance that converts electrical energy into thermal energy. When the electric kettle is not used for a long time or is used for too long, the resistance wire in the electric heating plate may fail, resulting in the electric heating plate heating temperature being too high, thereby triggering an overheating protection device. The existing overheating protection device includes an electric heating plate, a thermistor is fixedly connected to the lower end of the electric heating plate, a limit frame is provided on the lower end surface of the thermistor, a slide plate is slidably connected to the inner wall of the limit frame, a permanent magnet is fixedly connected to the upper end of the slide plate, a spring is also fixedly connected to the upper end of the slide plate, a support rod is fixedly connected to the lower end of the support rod, a support frame is provided at the lower end of the support rod, a first connecting piece is provided at the lower end of the support frame, a second connecting piece is provided at the lower end of the first connecting piece, a pressing plate is also provided at the lower end of the support frame, and a pressure plate is provided below the pressing plate A third connecting piece is provided, and a contact is provided on the side of the third connecting piece opposite to the first connecting piece. When the temperature of the electric heating plate is too high, the thermistor is fixedly connected to the electric heating plate, so the temperature of the thermistor rises with the temperature of the electric heating plate. At this time, the thermistor exceeds the Curie point due to the excessive temperature, which causes the magnetism of the thermistor to drop sharply, and the magnetic force between the thermistor and the permanent magnet is weakened. Under the resetting action of the spring, the permanent magnet and the support rod connected to the bottom of the permanent magnet are lowered, and the support rod drives one end of the support frame to descend, and the support frame drives the pressing plate to squeeze the third connecting piece, so that the third connecting piece descends, and the contact between the first connecting piece and the third connecting piece is disconnected, so that the circuit is disconnected, thereby preventing the electric heating plate from overheating and causing the internal parts of the electric kettle to be damaged due to overheating.

[0003] When the existing electric kettle boils water, the water expands and contracts due to the heating during the boiling process, and its volume increases. At the same time, a large number of bubbles will be generated on the bottom wall of the kettle body after the water boils. The bubbles will also cause the liquid level in the kettle to rise during the rising process, which may cause the water to overflow from the spout. The overflowing water will flow down along the outer wall of the kettle body, causing unnecessary trouble to the cleaning of the table.

[0004] Therefore, it is necessary to provide a new electrical overheat protection device to solve the above technical problems. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides an overheat protection device for electric heating of an electrical appliance.

[0006] The utility model provides an overheat protection device for an electric appliance, comprising: a kettle body and a base, wherein a spout is provided near the upper end of the kettle body, an anti-overflow component is inserted into the kettle body, a cavity is provided near the bottom end of the kettle body, and an overheat protection component is installed between the upper end surface and the lower end surface of the cavity;

[0007] The anti-overflow component includes a fixed rod, a sliding groove is provided near the bottom end of the kettle body, the fixed rod is inserted between the top wall and the bottom wall of the sliding groove, a carrying box is rotatably connected to the outside of the fixed rod, absorbent cotton is placed in the carrying box, a sliding block is slidably installed on the outer wall of the carrying box, a limit block with a limiting groove is fixedly installed near the bottom end of the kettle body, a hollow column is inserted into the kettle body, the hollow column is inserted from the inner cavity of the kettle body to the top wall of the sliding groove, and the hollow column is located above the absorbent cotton.

[0008] Preferably, the overheating protection component includes a thermistor magnet, the bottom of one end of the thermistor magnet is fixedly connected to a limiting frame, a permanent magnet is inserted in the limiting frame, the bottom end of the permanent magnet is fixedly connected to an elastic member, the lower end surface of the permanent magnet is also fixedly connected to a connecting plate 1, the bottom end of the connecting plate 1 is movably connected to a connecting plate 2, and the connecting plate 2 is rotatably connected to the side wall of the cavity, an induction end is arranged below the connecting plate 2, and corresponding contacts are arranged on the side opposite to the induction end and the connecting plate 2.

[0009] Preferably, a plurality of guide rods are fixedly connected to the lower end of the thermosensitive magnet, one end of the plurality of guide rods is fixedly connected to the bottom wall of the cavity, and the other end of the plurality of guide rods is inserted into the lower end surface of the thermosensitive magnet.

[0010] Preferably, the elastic member comprises a spring, the bottom end of the spring is fixedly connected to the bottom wall of the cavity, and the top end of the spring is fixedly connected to the permanent magnet.

[0011] Preferably, the top end of the hollow column is lower than the spout.

[0012] Preferably, the limiting block is located below the sliding block, and a limiting groove cooperating with the sliding block is provided in the limiting block.

[0013] Compared with the related art, the overheat protection device for electric heating of electrical appliances provided by the utility model has the following advantages:

[0014] Beneficial effects:

[0015] When the water in the kettle boils, more bubbles will be produced, thereby raising the liquid level. When the liquid level is higher than the hollow column, the liquid will flow out along the hollow column. At this time, the liquid will be absorbed by the absorbent cotton. Move the sliding block up, and then pull the sliding block. The sliding block drives the carrying box to rotate around the fixed rod, so that the absorbent cotton in the carrying box can be taken out and replaced. After the replacement is completed, the carrying box is rotated back to its original position, and then the fixed block is slid down into the limit block to prevent the carrying box from moving freely. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of the overheat protection device for electrical appliances provided by the utility model;

[0017] Figure 2 A schematic cross-sectional view of the overall structure of the overheat protection device for electric heating of an electrical appliance provided by the utility model;

[0018] Figure 3 A schematic diagram of a partial structural section of an electrical appliance overheat protection device provided by the utility model Figure 1 ;

[0019] Figure 4 A schematic diagram of a partial structural section of an electrical appliance overheat protection device provided by the utility model Figure 2 .

[0020] Numbers in the figure: 1. kettle body; 2. carrying box; 3. spout; 4. base; 5. limit frame; 6. fixing rod; 7. hollow column; 8. absorbent cotton; 9. sliding block; 10. sliding groove; 11. connecting plate 1; 12. electric heating plate; 13. thermistor magnet; 14. limit block; 15. permanent magnet; 16. spring; 17. guide rod; 18. contact; 19. induction end; 20. connecting plate 2; 21. rotating shaft. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0022] Please refer to Figure 1-4 ,in, Figure 1 This is a schematic diagram of the overall structure of the overheat protection device for electrical appliances provided by the utility model; Figure 2 A schematic cross-sectional view of the overall structure of the overheat protection device for electric heating of an electrical appliance provided by the utility model; Figure 3 A schematic cross-sectional view of a portion of the structure of the overheat protection device for an electrical appliance provided by the utility model; Figure 4 A schematic diagram of a partial structural section of an electrical appliance overheat protection device provided by the utility model Figure 2 .

[0023] In the specific implementation process, Figure 1 , 2 As shown, the kettle body 1 comprises a kettle body 1 and a base 4, a spout 3 is provided near the upper end of the kettle body 1, an anti-overflow component is inserted in the kettle body 1, a cavity is provided near the bottom end of the kettle body 1, and an overheat protection component is installed between the upper end surface and the lower end surface of the cavity;

[0024] The anti-overflow component includes a fixed rod 6, a sliding groove 10 is provided near the bottom end of the kettle body 1, the fixed rod 6 is inserted between the top wall and the bottom wall of the sliding groove 10, the fixed rod 6 is rotatably connected to the outer side of the carrying box 2, the carrying box 2 is provided with absorbent cotton 8, a sliding block 9 is slidably installed on the outer side wall of the carrying box 2, a limit block 14 with a limit groove is fixedly installed near the bottom end of the kettle body 1, a hollow column 7 is inserted in the kettle body 1, the hollow column 7 is inserted from the inner cavity of the kettle body 1 to the top wall of the sliding groove 10, and the hollow column 7 is located above the absorbent cotton 8;

[0025] It should be noted that during the heating process, the water temperature reaches the boiling point and boils to produce bubbles. The presence of bubbles in the liquid increases the overall volume of the liquid, thereby causing the liquid level to rise. Since the height of the hollow column 7 is lower than the height of the spout 3, when the liquid level exceeds the hollow column 7, the liquid flows into the absorbent cotton 8 along the hollow column 7, thereby preventing the liquid from overflowing from the spout 3. When the absorbent cotton 8 needs to be replaced, first pull the sliding block 9 upward to separate the sliding block 9 from the limit block 14, and then pull the sliding block 9. The sliding block 9 drives the supporting box 2 to rotate around the fixed column. At this time, the absorbent cotton 8 in the supporting box 2 can be taken out. After replacing the new absorbent cotton 8, the supporting box 2 is rotated back to its original position in the opposite direction, and then the sliding block 9 is inserted into the limit groove in the limit block 14 to prevent the supporting box 2 from moving freely.

[0026] like Figure 3 , 4 As shown, the overheat protection component includes a thermistor magnet 13, a limit frame 5 is bonded to the bottom of one end of the thermistor magnet 13, a permanent magnet 15 is inserted in the limit frame 5, an elastic member is welded to the bottom end of the permanent magnet 15, and a connecting plate 11 is integrally connected to the lower end surface of the permanent magnet 15, a connecting plate 20 is connected to the bottom end of the connecting plate 11 through a rotating shaft, and a rotating shaft 21 is inserted in the connecting plate 20, and both ends of the rotating shaft 21 are bonded to the side wall of the cavity of the kettle body 1, and a sensing end 19 is arranged below the connecting plate 20, and a corresponding contact 18 is arranged on the side opposite to the connecting plate 20;

[0027] It should be noted that the electric kettle is placed on the base 4 for heating. Since the temperature is relatively low at this time, the temperature of the thermistor 13 has not reached the Curie point. At this time, the magnetism of the thermistor 13 is relatively strong, and the permanent magnet 15 is magnetically linked to the thermistor 13. At this time, the spring 16 is in a stretched state. When the electric heating plate 12 fails and causes the temperature to rise, the temperature of the thermistor 13 rises with the electric heating plate 12. At this time, the temperature of the thermistor 13 exceeds the Curie point, so that the magnetism of the thermistor 13 is sharply weakened. At this time, under the resetting action of the spring 16, the permanent magnet 15 is lowered along the guide rod 17 and the limit frame 5. At the same time, the connecting plate 11 is lowered with the permanent magnet 15, and the connecting plate 2 20 is rotationally connected to the connecting plate 1 11, and the connecting plate 2 20 is rotationally connected to the side wall of the inner cavity of the kettle body 1. At this time, the connecting plate 2 20 rotates, so that the contact 18 at one end of the connecting plate 20 rises, thereby separating the two oppositely arranged contacts 18.

[0028] A plurality of guide rods 17 are fixedly connected to the lower end of the thermosensitive magnet 13, one end of the plurality of guide rods 17 is fixedly connected to the bottom wall of the cavity, and the other end of the plurality of guide rods 17 is inserted into the lower end surface of the thermosensitive magnet 13;

[0029] It should be noted that the plurality of guide rods 17 not only guide the permanent magnet 15 but also support the thermosensitive magnet 13 .

[0030] The elastic member includes a spring 16 , the bottom end of the spring 16 is fixedly connected to the bottom wall of the cavity, and the top end of the spring 16 is fixedly connected to the permanent magnet 15 .

[0031] The top end of the hollow column 7 is lower than the spout 3 .

[0032] The limiting block 14 is located below the sliding block 9 , and a limiting groove cooperating with the sliding block 9 is formed in the limiting block 14 .

[0033] The working principle provided by the utility model is as follows: since the liquid in the kettle body 1 is continuously heated to boiling, a large number of bubbles are generated in the kettle body 1, thereby causing the liquid level in the kettle body 1 to rise. When the liquid level in the kettle body 1 exceeds the hollow column 7, the liquid flows into the absorbent cotton 8 along the hollow column 7. When the absorbent cotton 8 needs to be replaced, the sliding block 9 is first lifted to separate the sliding block 9 from the limiting block 14, and then the sliding block 9 is pulled to drive the supporting box 2 to rotate around the fixed rod 6. At this time, the absorbent cotton 8 can be replaced. After the replacement is completed, the supporting box 2 is rotated back to its original position in the opposite direction, and then the sliding block 9 is inserted into the limiting groove of the limiting block 14 to prevent the absorbent cotton 8 from being not below the hollow column 7 due to the free movement of the supporting box 2, thereby failing to absorb the liquid well.

[0034] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0035] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An overheat protection device for electric heating of an electrical appliance, characterized in that: The kettle body (1) comprises a kettle body (1) and a base (4); the kettle body (1) is provided with a spout (3) near the upper end; an anti-overflow component is inserted into the kettle body (1); a cavity is provided near the bottom end of the kettle body (1); an overheat protection component is installed between the upper end surface and the lower end surface of the cavity; The anti-overflow component comprises a fixed rod (6), a sliding groove (10) is provided near the bottom of the kettle body (1), the fixed rod (6) is inserted between the top wall and the bottom wall of the sliding groove (10), the fixed rod (6) is rotatably connected to a carrying box (2) outside, absorbent cotton (8) is placed in the carrying box (2), a sliding block (9) is slidably installed on the outer wall of the carrying box (2), a limit block (14) with a limit groove is fixedly installed near the bottom of the kettle body (1), a hollow column (7) is inserted in the kettle body (1), the hollow column (7) is inserted from the inner cavity of the kettle body (1) to the top wall of the sliding groove (10), and the hollow column (7) is located above the absorbent cotton (8).

2. The overheat protection device for electrical appliances according to claim 1, characterized in that: The overheat protection component comprises a thermally sensitive magnet (13), the bottom of one end of the thermally sensitive magnet (13) is fixedly connected to a limit frame (5), a permanent magnet (15) is inserted into the limit frame (5), the bottom of the permanent magnet (15) is fixedly connected to an elastic member, the lower end of the permanent magnet (15) is also fixedly connected to a connecting plate 1 (11), the bottom of the connecting plate 1 (11) is movably connected to a connecting plate 2 (20), and the connecting plate 2 (20) is rotatably connected to the side wall of the cavity, an induction end (19) is arranged below the connecting plate 2 (20), and a corresponding contact (18) is arranged on the side opposite to the connecting plate 2 (20).

3. The overheat protection device for electric heating of an electrical appliance according to claim 2, characterized in that: A plurality of guide rods (17) are fixedly connected to the lower end of the thermosensitive magnet (13), one end of the plurality of guide rods (17) is fixedly connected to the bottom wall of the cavity, and the other end of the plurality of guide rods (17) is inserted into the lower end surface of the thermosensitive magnet (13).

4. The overheat protection device for electric heating of an electrical appliance according to claim 3, characterized in that: The elastic member comprises a spring (16), the bottom end of the spring (16) is fixedly connected to the bottom wall of the cavity, and the top end of the spring (16) is fixedly connected to the permanent magnet (15).

5. The overheat protection device for electric heating of an electrical appliance according to claim 4, characterized in that: The top end of the hollow column (7) is lower than the spout (3).

6. The overheat protection device for electric heating of an electrical appliance according to claim 5, characterized in that: The limit block (14) is located below the sliding block (9), and a limit groove cooperating with the sliding block (9) is provided in the limit block (14).

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