Thermal protector with stable resistance value of bimetallic strip resistor

Abstract

The utility model belongs to the technical field of thermal protectors, and particularly relates to a thermal protector with stable resistance value of a bimetallic strip resistor, which comprises a shell, static contact pieces are fixed in two through holes arranged at the bottom of the shell, a screw in threaded connection with the shell is arranged between the two static contact pieces, and the two static contact pieces are fixed on the shell. And a deformable bimetallic strip is clamped on the surface of the screw rod in a limiting manner. By arranging the shell, the annular plate, the guide seat, the threaded sleeve, the threaded pipe, the wire fixing block and the protective cover assembly, in the process of using the thermal protector with the stable resistance value of the bimetallic strip resistor, after one end of a connecting wire is arranged in the wire fixing block, the threaded sleeve is operated to rotate to drive the threaded pipe to move downwards to extrude the wire fixing block, and the resistance value of the bimetallic strip resistor is stable. And the wire fixing block shrinks towards the center after being extruded, so that the connection wire can be fixed without being fixed in a welding manner, the operation is convenient, and the influence on the conductivity and the service life of the connection wire is avoided.

Description

Technical Field

[0001] This utility model relates to the field of thermal protector technology, specifically a thermal protector with stable bimetallic strip resistance. Background Technology

[0002] A thermal protector consists of two different alloys combined together. When current flows through them, they heat up. Due to the different coefficients of thermal expansion of the two alloys, they inevitably bend in one direction, causing the contacts to separate and cutting off the power. This protects electrical equipment and is widely used in household appliance motors and equipment, such as washing machine motors, air conditioner fan motors, transformers, ballasts, and electric heating appliances. However, in current thermal protectors, the wires are usually connected to the terminals by soldering. Soldering the wires is not only relatively complicated, but the wires may also deform due to high temperatures during the soldering process, affecting their conductivity and lifespan. Therefore, we propose a thermal protector with a stable bimetallic strip resistance to solve the above problems. Utility Model Content

[0003] (1) Technical problems solved

[0004] To address the shortcomings of existing technologies, this invention provides a thermal protector with stable bimetallic strip resistance, thus solving the problems mentioned in the background section.

[0005] (2) Technical solution

[0006] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0007] A thermal protector with stable bimetallic strip resistance includes a housing. Two openings at the bottom of the housing each contain a stationary contact piece. A screw threaded to the housing is positioned between the two stationary contacts. A deformable bimetallic strip is secured to the surface of the screw. Two moving contacts are fixed to the lower surface of the deformable bimetallic strip, each contact engaging with a corresponding stationary contact piece. A metal ring is fitted onto the surface of the screw, and a retaining ring is engaged with the screw to limit the movement of the metal ring. An insulating separator ring is positioned between the metal ring and the deformable bimetallic strip. An annular plate is fixed to the surface of the screw, and a guide seat is fixed to the surface of the annular plate. A threaded sleeve is rotatably connected to the bottom of the guide seat, and a threaded tube is threadedly connected to the inner thread of the threaded sleeve. A wire-fixing block is fixed to the bottom of the screw, sliding within the threaded tube. A protective cover assembly is provided at the top of the housing.

[0008] Furthermore, the protective cover assembly includes a cover plate that fits onto the top of the housing. A guide plate and a T-shaped plate are fixed to the surface of the cover plate. A U-shaped plate slides through the side wall of the T-shaped plate. A limiting seat that matches the T-shaped plate and the U-shaped plate is fixed to the bottom of the housing. The U-shaped plate is inserted into two slots in the limiting seat. Two slots are opened at the top of the U-shaped plate. Springs are fixed inside two circular recesses at the bottom of the limiting seat. A movable plate is fixed to the bottom of the two springs. Two locking blocks that match the slots are fixed to the top of the movable plate. The tops of the locking blocks slide through the limiting seat and lock into the corresponding slots.

[0009] Furthermore, anti-slip rubber pads are fixed to one side wall of both the guide plate and the T-shaped plate.

[0010] Furthermore, a limiting rod slides inside the through hole opened on the side wall of the T-shaped plate, and one end of the limiting rod is fixedly connected to the U-shaped plate.

[0011] Furthermore, a sealing ring is fixed to the bottom of the cover plate, and the bottom of the sealing ring is tightly fitted to the top of the housing.

[0012] Furthermore, an anti-slip rotating ring is fixed to the outer wall of the threaded sleeve.

[0013] (3) Beneficial effects

[0014] Compared with the prior art, this utility model provides a thermal protector with stable bimetallic strip resistance, which has the following advantages:

[0015] This invention, through the assembly of a shell, annular plate, guide seat, threaded sleeve, threaded tube, wire fixing block, and protective cover, utilizes a bimetallic strip thermal protector with stable resistance. When one end of the connecting wire is placed inside the wire fixing block, rotating the threaded sleeve causes the threaded tube to move downwards, compressing the wire fixing block. The wire fixing block, under pressure, contracts towards the center, thus securing the connecting wire without the need for welding. This method is convenient and avoids impacting the conductivity and lifespan of the connecting wire. The protective cover assembly is tightly fitted to the shell, preventing detachment and providing excellent sealing, thereby improving the explosion-proof performance of the thermal protector. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the wire-fixing block structure of this utility model;

[0019] Figure 4 This is a first-person exploded view of the structure of the protective cover assembly of this utility model;

[0020] Figure 5 This is a second-view exploded view of the protective cover assembly structure of this utility model.

[0021] In the diagram: 1. Housing; 2. Static contact piece; 3. Screw; 4. Deformable bimetallic strip; 5. Moving contact; 6. Anti-slip rotating ring; 7. Metal ring; 8. Limiting retaining ring; 9. Insulating separating ring; 10. Annular plate; 11. Guide seat; 12. Threaded sleeve; 13. Threaded tube; 14. Wire fixing block; 15. Protective cover assembly; 1501. Cover plate; 1502. Guide plate; 1503. T-shaped plate; 1504. U-shaped plate; 1505. Limiting seat; 1506. Slot; 1507. Spring; 1508. Moving plate; 1509. Locking block; 1510. Anti-slip rubber pad; 1511. Limiting rod; 1512. Sealing ring. Detailed Implementation

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Example

[0024] like Figure 1 , Figure 2 and Figure 3As shown in the figure, an embodiment of the present invention discloses a thermal protector with stable bimetallic strip resistance, comprising a housing 1. Two through-holes at the bottom of the housing 1 each house a stationary contact piece 2. A screw 3, threaded onto the housing 1, is disposed between the two stationary contact pieces 2. A deformable bimetallic strip 4 is fixedly engaged on the surface of the screw 3. Two moving contacts 5 are fixed to the lower surface of the deformable bimetallic strip 4, and the moving contacts 5 respectively abut against the corresponding stationary contact pieces 2. A metal ring 7 is fitted onto the surface of the screw 3, and the surface of the screw 3 is engaged with... A limiting ring 8 is provided to limit the movement of the metal ring 7. An insulating separator ring 9 is provided between the metal ring 7 and the deformable bimetallic strip 4. An annular plate 10 is fixed to the surface of the screw 3. A guide seat 11 is fixed to the surface of the annular plate 10. A threaded sleeve 12 is rotatably connected to the bottom of the guide seat 11. An anti-slip rotating ring 6 is fixed to the outer wall of the threaded sleeve 12. When the threaded sleeve 12 is rotated to fix the wire, the friction between the hand and the surface of the threaded sleeve 12 can achieve an anti-slip effect. The internal threads of the threaded sleeve 12 are threaded. The device has a threaded tube 13, and a wire-fixing block 14 is fixed to the bottom end of the screw 3. The wire-fixing block 14 slides inside the threaded tube 13. A protective cover assembly 15 is provided on the top of the housing 1. Using this type of thermal protector with stable bimetallic strip resistance, because the deformable bimetallic strip 4 has stamping burrs on its core surface during processing, it increases the contact resistance between the metal washer and the bimetallic strip during operation. The insulating separator ring 9 can interrupt the contact resistance between the metal washer and the bimetallic strip, thereby ensuring thermal protection. The protector operates stably and consistently. When wiring is required, one end of the wire can be placed inside the wire fixing block 14. Then, a tool can be used to limit the guide seat 11 to prevent the screw 3 from rotating when the threaded sleeve 12 is rotated. Then, the threaded sleeve 12 can be operated to rotate. After the threaded sleeve 12 rotates, it can drive the threaded tube 13 to move down. After the threaded tube 13 moves down, it will squeeze the wire fixing block 14 to deform it. After the deformation, it will shrink back to the center position. At this time, the connecting wire can be fixed on the screw 3. The operation is convenient.

[0025] like Figure 1 , Figure 4 and Figure 5As shown, in some embodiments, the protective cover assembly 15 includes a cover plate 1501 that adheres to the top of the housing 1. A sealing ring 1512 is fixed to the bottom of the cover plate 1501. The bottom of the sealing ring 1512 is tightly fitted to the top of the housing 1, which can enhance the tightness of the cover plate 1501 and the housing 1 after they are fitted together, and prevent dust and moisture in the air from entering the interior of the housing 1 through the joint. A guide plate 1502 and a T-shaped plate 1503 are fixed to the surface of the cover plate 1501. Anti-slip rubber pads 1510 are fixed to one side wall of both the guide plate 1502 and the T-shaped plate 1503, so that when the cover plate 1501 is removed and separated from the housing 1, the protective cover assembly 1501 is securely fitted to the housing 1. The anti-slip rubber pad 1510 increases the friction between the hand and the surfaces of both, thus achieving an anti-slip effect. A U-shaped plate 1504 slides through the side wall of the T-shaped plate 1503. A limiting seat 1505, compatible with the T-shaped plate 1503 and the U-shaped plate 1504, is fixed to the bottom of the housing 1. The U-shaped plate 1504 is inserted into two slots in the limiting seat 1505. Two slots 1506 are formed on the top of the U-shaped plate 1504. Springs 1507 are fixed inside two circular recesses at the bottom of the limiting seat 1505. A movable plate 1508 is fixed to the bottom of the two springs 1507. Two slots 1506 are fixed to the top of the movable plate 1508. The 506-compatible locking block 1509 has its top end sliding through the limiting seat 1505 and engaging inside the corresponding locking slot 1506. During use, the cover plate 1501 protects the interior of the housing 1, preventing any impact on its sealing. The cover plate 1501 is snap-fitted onto the housing 1, making separation easier later. To separate the cover plate 1501 from the housing 1, the moving plate 1508 can be pulled down. After the moving plate 1508 moves down, the spring 1507 is stretched, and the downward movement of the moving plate 1508 will also drive two... The locking block 1509 disengages from the inside of the slot 1506, thereby releasing the restriction on the U-shaped plate 1504. At this time, the U-shaped plate 1504 can be slid out from the slot of the limiting seat 1505, and then the cover plate 1501 can be separated from the housing 1. During installation, the above operation is repeated. After the cover plate 1501 is attached to the housing 1, the U-shaped plate 1504 can be inserted into the inside of the limiting seat 1505. The moving plate 1508 is released, and then the locking block 1509 can be re-engaged into the inside of the slot 1506 under the reset force of the tension spring 1507. At this time, the U-shaped plate 1504 can be limited and fixed.

[0026] like Figure 2As shown, in some embodiments, a limiting rod 1511 slides inside the through hole opened on the side wall of the T-shaped plate 1503. One end of the limiting rod 1511 is fixedly connected to the U-shaped plate 1504 to limit the movement and prevent the U-shaped plate 1504 from detaching from the T-shaped plate 1503 after sliding on it.

[0027] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A thermal protector with stable bimetallic strip resistance, comprising a housing (1), characterized in that: The bottom of the housing (1) has two openings, each containing a stationary contact piece (2). A screw (3) threaded onto the housing (1) is located between the two stationary contact pieces (2). A deformable bimetallic strip (4) is fixed to the surface of the screw (3). Two moving contacts (5) are fixed to the lower surface of the deformable bimetallic strip (4). The moving contacts (5) are respectively attached to the corresponding stationary contact pieces (2). A metal ring (7) is fitted onto the surface of the screw (3). A limiting ring (8) for limiting the movement of the metal ring (7) is also attached to the surface of the screw (3). An insulating separator ring (9) is provided between the metal ring (7) and the deformable bimetallic strip (4). An annular plate (10) is fixed on the surface of the screw (3). A guide seat (11) is fixed on the surface of the annular plate (10). A threaded sleeve (12) is rotatably connected to the bottom of the guide seat (11). A threaded tube (13) is threadedly connected to the inside of the threaded sleeve (12). A wire fixing block (14) is fixed at the bottom of the screw (3). The wire fixing block (14) slides inside the threaded tube (13). A protective cover assembly (15) is provided on the top of the housing (1).

2. The thermal protector with stable bimetallic strip resistance according to claim 1, characterized in that: The protective cover assembly (15) includes a cover plate (1501) fitted to the top of the housing (1). A guide plate (1502) and a T-shaped plate (1503) are fixed to the surface of the cover plate (1501). A U-shaped plate (1504) slides through the side wall of the T-shaped plate (1503). A limiting seat (1505) adapted to the T-shaped plate (1503) and the U-shaped plate (1504) is fixed to the bottom of the housing (1). The U-shaped plate (1504) is inserted into two slots opened in the limiting seat (1505). The top of the U-shaped plate (1504) has two slots (1506), and the bottom of the limiting seat (1505) has two circular recesses with springs (1507) fixed inside. The bottom of the two springs (1507) is fixed with a moving plate (1508). The top of the moving plate (1508) has two locking blocks (1509) that are adapted to the slots (1506). The top of the locking blocks (1509) slides through the limiting seat (1505) and is locked inside the corresponding slots (1506).

3. A thermal protector with stable bimetallic strip resistance according to claim 2, characterized in that: Anti-slip rubber pads (1510) are fixed to one side wall of both the guide plate (1502) and the T-shaped plate (1503).

4. A thermal protector with stable bimetallic strip resistance according to claim 2, characterized in that: A limiting rod (1511) slides inside the through hole opened on the side wall of the T-shaped plate (1503), and one end of the limiting rod (1511) is fixedly connected to the U-shaped plate (1504).

5. A thermal protector with stable bimetallic strip resistance according to claim 2, characterized in that: A sealing ring (1512) is fixed to the bottom of the cover plate (1501), and the bottom of the sealing ring (1512) is tightly fitted to the top of the housing (1).

6. A thermal protector with stable bimetallic strip resistance according to claim 1, characterized in that: The outer wall of the threaded sleeve (12) is fixed with an anti-slip rotating ring (6).

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