A thermal protector with manual reset

Abstract

The utility model relates to a manually reset thermal protector, comprising a shell with an opening and a temperature control structure, wherein the temperature control structure is embedded in the shell through the opening, and two electrode ends of the temperature control structure are connected with connecting wires extending from the opening to the outside, and the temperature control structure comprises a moving contact component, a static contact component, a temperature sensing component and a manual reset device, wherein the temperature sensing component is placed between the moving contact component and the static contact component, and causes the moving contact component to contact or separate from the static contact component; a manual reset bracket is arranged on the outer side of the shell, and the manual reset device is limitedly slid on the manual reset bracket, and one end of the manual reset device extends into the shell and is adjacent to or abuts against the temperature sensing component; this thermal protector realizes manual reset by using the manual reset device, so that the thermal protector can be recycled and reused, can reduce production costs, and has the advantages of convenient installation and wide application range.

Description

Technical Field

[0001] The utility model relates to the field of thermal protectors, in particular to a thermal protector with manual reset. Background Art

[0002] Thermal protectors are widely used in household appliances, motors and electrical equipment, such as washing machine motors, air conditioner fan motors, transformers, ballasts, electric heating appliances and other automatic protection. Current thermal protectors all use dual protection, using bimetallic strips as temperature sensing elements and disposable non-resettable ceramic fuses. Ceramic fuses are used as secondary protection in abnormal working environments. After the automatic reset protection thermostat fails, the secondary protection starts working. The working principle of ceramic fuses is mainly based on the characteristics that ceramic materials and metal conductors with different thermal expansion coefficients produce different temperatures and expansion coefficients under the action of current. When the current in the circuit exceeds a certain value, the fuse will heat and melt, causing the circuit to be disconnected, avoiding personal safety and property losses to consumers. However, ceramic fuses are one-time work and cannot be reused. After protection occurs, the entire fuse needs to be replaced, which is inconvenient to disassemble and assemble. Therefore, it is necessary to improve and perfect the current thermal protector to meet long-term use needs. Summary of the invention

[0003] The utility model aims to provide a manual reset thermal protector which has a simple and reasonable structure, is easy to install and has a stable structure.

[0004] A manually reset thermal protector comprises a shell with an opening and a temperature control structure, wherein the temperature control structure is embedded in the shell through the opening, and two electrode ends of the temperature control structure are connected with connecting wires extending from the opening to the outside, and the temperature control structure comprises a moving contact component, a stationary contact component, a temperature sensing component and a manual reset device, wherein the temperature sensing component is placed between the moving contact component and the stationary contact component and causes the moving contact component to contact or separate from the stationary contact component; a manual reset bracket is arranged on the outside of the shell, and the manual reset device is limitedly slid on the manual reset bracket, and one end of the manual reset device extends into the shell and is adjacent to or against the temperature sensing component.

[0005] The purpose of the utility model can also be solved by the following technical measures:

[0006] As a more specific solution, the temperature sensing element assembly includes a bimetallic temperature sensing element and a manual reset steel sheet placed above the bimetallic temperature sensing element. The bimetallic temperature sensing element and the manual reset steel sheet are connected to the moving contact assembly, and one end of the manual reset device is adjacent to or against the manual reset steel sheet.

[0007] As a further solution, the moving contact assembly includes a metal base and a moving contact piece arranged above the metal base, the manual reset steel sheet and the bimetallic temperature sensor are placed between the moving contact piece and the metal base in sequence, and the fixed ends of the manual reset steel sheet, the bimetallic temperature sensor and the moving contact piece are riveted to one end of the metal base in sequence, the moving contact piece is provided with an avoidance hole corresponding to the manual reset device, and an electrode end is provided at the other end of the metal base.

[0008] As a further solution, the static contact assembly includes an insulating seat and a static contact piece, the insulating seat is connected to one end of the metal base close to the opening, the static contact piece is connected to the insulating seat, and one end of the static contact piece is elastically in contact with the movable end of the moving contact piece, and the other end of the static contact piece extends out of the insulating seat and constitutes another electrode end.

[0009] As a further solution, the manual reset device includes an insulating push rod and a button, the button is connected to the top end of the insulating push rod; the insulating push rod slides linearly between the manual reset bracket and the housing, the bottom end of the insulating push rod extends into the housing and is adjacent to or abuts against the moving contact piece, and the insulating push rod or the button is provided with a manual limiting structure limited between the manual reset bracket and the housing.

[0010] As a further solution, the top end of the insulating push rod is connected to one end of the button, the other end of the button is provided with a guide through hole, and the housing extends with a guide protrusion that forms a linear sliding fit with the guide through hole.

[0011] As a further solution, the shell is provided with an L-shaped through hole corresponding to the temperature sensing piece assembly, the manual reset bracket is provided with an L-shaped guide hole overlapping with the L-shaped through hole, one end of the L-shaped through hole and the L-shaped guide hole is provided with a push rod installation entrance, and the insulating push rod slides directly at the other end of the L-shaped through hole and the L-shaped guide hole.

[0012] As a further solution, the manual limiting structure includes a limiting ring, the limiting ring is integrally connected to the middle position of the insulating push rod, and the limiting ring is limitedly slid between the manual reset bracket and the housing.

[0013] As a further solution, a metal sheet is connected to the insulating seat by integral injection molding, one end of the metal sheet is exposed on the surface of the insulating seat to form a static contact sheet, and the other end of the metal sheet extends out of the insulating seat to form an electrode terminal.

[0014] As a further solution, the insulating seat is placed on top of the metal base, and a pair of pressing ears arranged on the left and right sides of the insulating seat are integrally extended from the metal base. The pressing ears are riveted to the upper surface of the insulating seat to connect the metal base and the insulating seat.

[0015] The beneficial effects of the utility model are as follows:

[0016] The utility model discloses a manually reset thermal protector, which utilizes a manual reset device to realize manual reset, so that the thermal protector can be used repeatedly, can reduce production costs, and has the advantages of easy installation, wide application range, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the sectional structure of an embodiment of the utility model.

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the thermal protector in the utility model.

[0019] Figure 3 This is a schematic diagram of the exploded structure of the thermal protector in the utility model.

[0020] Figure 4 It is a schematic diagram of the connection and matching structure between the manual reset device and the manual reset bracket in the utility model.

[0021] Figure 5 It is a schematic diagram of the insulating seat structure in the utility model. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0023] like Figures 1 to 5 As shown, a manually reset thermal protector comprises a shell 1 with an opening and a temperature control structure 2, wherein the temperature control structure 2 is embedded in the shell 1 through the opening, and two electrode ends 201 of the temperature control structure 2 are connected with connecting wires 3 extending from the opening to the outside, and the temperature control structure 2 comprises a moving contact component 4, a stationary contact component 5, a temperature sensing piece component 6 and a manual reset device 7, wherein the temperature sensing piece component 6 is placed between the moving contact component 4 and the stationary contact component 5, and causes the moving contact component 4 to contact or separate from the stationary contact component 5; a manual reset bracket 8 is arranged on the outer side of the shell 1, and the manual reset device 7 is limitedly slid on the manual reset bracket 8, and one end of the manual reset device 7 extends into the shell 1, and is adjacent to or abuts against the temperature sensing piece component 6.

[0024] This thermal protector utilizes the manual reset device 7 to realize manual reset, so that the thermal protector can be used repeatedly, which can reduce the production cost, and has the advantages of easy installation and wide application range.

[0025] Specifically, the temperature sensing element assembly 6 includes a bimetallic temperature sensing element 61 and a manual reset steel sheet 62 placed above the bimetallic temperature sensing element 61 . The bimetallic temperature sensing element 61 and the manual reset steel sheet 62 are connected to the moving contact element 4 . One end of the manual reset device 7 is adjacent to or against the manual reset steel sheet 62 .

[0026] The moving contact assembly 4 includes a metal base 41 and a moving contact piece 42 arranged above the metal base 41, the manual reset steel sheet 62 and the bimetallic temperature sensing piece 61 are sequentially placed between the moving contact piece 42 and the metal base 41, and the fixed ends of the manual reset steel sheet 62, the bimetallic temperature sensing piece 61 and the moving contact piece 42 are sequentially riveted to one end of the metal base 41, the moving contact piece 42 is provided with an avoidance hole 423 corresponding to the manual reset device 7, the other end of the metal base 41 is provided with an electrode end 201, the electrode end 201 is connected to a connecting wire 3, and the avoidance hole 423 enables one end of the manual reset device 7 to pass through the moving contact piece 42 and directly cooperate with the manual reset steel sheet 62;

[0027] The static contact assembly 5 includes an insulating seat 51 and a static contact piece 52. The insulating seat 51 is connected to one end of the metal base 41 that is close to the opening. The static contact piece 52 is connected to the insulating seat 51, and one end of the static contact piece 52 is elastically in contact with the movable end of the moving contact piece 42. The other end of the static contact piece 52 extends out of the insulating seat 51 and constitutes another electrode end 201, which is connected to another connecting wire 3.

[0028] Combined with the above structure, when the thermal protector is in normal use, the moving contact 421 of the moving contact piece 42 abuts against the static contact piece 52. When the product protected by the thermal protector exceeds the limit temperature, the automatically reset bimetallic temperature-sensing piece 61 starts to work, and the internal stress generated by heat causes it to move quickly. The movable end of the bimetallic temperature-sensing piece 61 pops up and pushes the manual reset steel sheet 62 and the moving contact piece 42 in turn. The moving contact piece 42 leaves the static contact piece 52 to disconnect the circuit.

[0029] After the bimetallic temperature-sensing piece 61 cools down, it automatically resets itself, and the manual reset steel sheet 62 supports the starting contact piece 42, preventing the moving contact piece 42 from contacting the stationary contact piece 52 to connect the circuit. At this time, the manual reset device 7 must be manually driven to push the manual reset steel sheet 62 downward. After the manual reset steel sheet 62 resets downward, the moving contact piece 42 contacts the stationary contact piece 52, so that the thermal protector can be manually reset.

[0030] The end of the metal base 41 away from the opening is bent to form a folded edge 411, the manual reset steel sheet 62, the bimetallic temperature sensing sheet 61 and the fixed end of the moving contact sheet 42 are sequentially stacked and riveted on the folded edge 411, and the metal base 41 is provided with a tapered boss 412 stretched upward, the height of the tapered boss 412 is equal to or close to the height of the folded edge 411, and the tapered boss 412 is held against the middle position of the bimetallic temperature sensing sheet 61;

[0031] The raised folded edge 411 allows the bimetallic temperature sensor 61 to be spaced apart from the metal base 41 to prevent the heat of the metal base 41 from being directly transferred to the bimetallic temperature sensor 61 . In addition, the conical boss 412 supports the bimetallic temperature sensor 61 to prevent the bimetallic temperature sensor 61 from being over-reset.

[0032] The length of the moving contact piece 42 is greater than that of the bimetallic temperature-sensing piece 61, so that a distance is maintained between the bimetallic temperature-sensing piece 61 and the stationary contact piece 52, and a downwardly stretched conical convex bump 422 is provided in the middle of the moving contact piece 42, and the movable end of the bimetallic temperature-sensing piece 61 is pushed against the bottom of the conical convex bump 422 after being deformed by overheating; when the bimetallic temperature-sensing piece 61 generates internal stress due to heat, the conical convex bump 422 helps the bimetallic temperature-sensing piece 61 to push the movable end of the contact piece 42 to move.

[0033] The manual reset device 7 includes an insulating push rod 71 and a button 72, wherein the button 72 is connected to the top end of the insulating push rod 71; the insulating push rod 71 slides linearly between the manual reset bracket 8 and the housing 1, and the bottom end of the insulating push rod 71 extends into the housing 1 and is adjacent to or abuts against the moving contact piece, and a manual limiting structure limited between the manual reset bracket 8 and the housing 1 is provided on the insulating push rod 71 or the button 72.

[0034] The top end of the insulating push rod 71 is connected to one end of the button 72, and the other end of the button 72 is provided with a guide hole 721. The housing 1 is provided with a guide boss 11 that forms a linear sliding fit with the guide hole 721. The user manually presses the button 72 to drive the insulating push rod 71 to move downward, and the fit between the guide boss 11 and the guide hole 721 can ensure that the insulating push rod 71 maintains vertical up and down movement.

[0035] The housing 1 is provided with an L-shaped through hole 12 corresponding to the temperature sensing piece assembly 6, the manual reset bracket 8 is provided with an L-shaped guide hole 81 overlapping with the L-shaped through hole 12, and one end of the L-shaped through hole 12 and the L-shaped guide hole 81 are provided with push rod installation openings 121 and 82, and the insulating push rod 71 slides directly on the other end of the L-shaped through hole 12 and the L-shaped guide hole 81; so that the insulating push rod 71 can be installed on the manual reset bracket 8 at any time, and it is convenient for the manual limiting structure to be stuck between the manual reset bracket 8 and the housing 1.

[0036] The manual limiting structure includes a limiting ring 73, which is integrally connected to the middle position of the insulating push rod 71, and the limiting ring 73 is limited to slide between the manual reset bracket 8 and the housing 1; the limiting ring 73 can limit the upper and lower range of the insulating push rod 71 to prevent the insulating push rod 71 from being pressed down too deep to damage the temperature sensing element assembly, or to prevent it from being pulled straight up.

[0037] The installation process of the manual reset device 7 is as follows: first, slide the insulating push rod 71 from the push rod installation inlets 121, 82 into the L-shaped through hole 12 and the L-shaped guide hole 81 until the insulating push rod 71 is against the other end of the L-shaped through hole 12 and the L-shaped guide hole 81, then rotate the button 72 along the insulating push rod 71 as the central axis, so that the guide through hole 721 of the rotating button 72 is aligned with the guide boss 11, and finally slide the insulating push rod 71 downward to make the guide through hole 721 inserted into the outside of the guide boss 11; use the guide boss 11 to ensure that the insulating push rod 71 slides up and down in a straight line, and pull the insulating push rod 7 to prevent the insulating push rod 7 from sliding out along the L-shaped through hole 12 and the L-shaped guide hole 81 to the push rod installation inlets 121, 82.

[0038] A metal sheet is connected to the insulating seat 51 through integral injection molding, one end of the metal sheet is exposed on the surface of the insulating seat 51 to form a static contact sheet 52, and the other end of the metal sheet extends out of the insulating seat 51 to form an electrode end 201, so that the internal structure of the thermal protector is more compact, the static contact sheet 52 can be firmly connected to the insulating seat 51, and it plays an isolation role to prevent the static contact sheet 52 from approaching the metal base 41 or the housing 1 and causing creepage.

[0039] The insulating seat 51 mainly includes a rear seat 511 tightly matched with the shell 1 and a front seat 512 connected to the metal base 41. An island platform 513 is provided in the middle of the front seat 512. The static contact piece 52 is integrally arranged on the upper surface of the island platform 513, and a creepage groove 514 is provided between the island platform 513 and the front seat 512. The creepage groove 514 can increase the creepage distance of the static contact piece 52 and improve the safety of the thermal protector.

[0040] The insulating seat 51 is placed on top of the metal base 41. A pair of pressing ears 413 arranged on the left and right sides of the insulating seat 51 are integrally extended from the metal base 41. The pressing ears 413 are riveted to the upper surface of the insulating seat 51 to connect the metal base 41 and the insulating seat 51 to each other. The structure is simple, the connection is firm and stable, and it is easy to assemble and disassemble. It is suitable for use on an automated production line, so that structures made of two different materials can be connected.

[0041] The opening of the housing 1 is encapsulated by epoxy resin 9 to prevent liquid or foreign matter from entering the housing 1 .

[0042] The housing 1 is a hollow long flat structure and is made of plastic, ceramic or metal in one piece; the manual reset device 7 is made of plastic or ceramic in one piece.

[0043] The above is a preferred embodiment of the utility model, which shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. The utility model may have various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements fall within the scope of the utility model to be protected, and the scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A manually reset thermal protector, comprising a housing with an opening and a temperature control structure, wherein the temperature control structure is embedded in the housing through the opening, and two electrode ends of the temperature control structure are connected to connecting wires extending from the opening to the outside, characterized in that: The temperature control structure includes a dynamic contact component, a static contact component, a temperature sensing component and a manual reset device. The temperature sensing component is placed between the dynamic contact component and the static contact component, and causes the dynamic contact component to contact or separate from the static contact component. A manual reset bracket is provided on the outer side of the shell, and the manual reset device is limitedly slid on the manual reset bracket, and one end of the manual reset device extends into the shell and is adjacent to or against the temperature sensing component.

2. A manually reset thermal protector according to claim 1, characterized in that The temperature sensing element assembly includes a bimetallic temperature sensing element and a manual reset steel sheet placed above the bimetallic temperature sensing element. The bimetallic temperature sensing element and the manual reset steel sheet are connected to the moving contact assembly, and one end of the manual reset device is adjacent to or against the manual reset steel sheet.

3. A manually reset thermal protector according to claim 2, characterized in that The moving contact assembly includes a metal base and a moving contact piece arranged above the metal base, the manual reset steel sheet and the bimetallic temperature-sensing piece are placed between the moving contact piece and the metal base in sequence, and the fixed ends of the manual reset steel sheet, the bimetallic temperature-sensing piece and the moving contact piece are riveted to one end of the metal base in sequence, the moving contact piece is provided with an avoidance hole corresponding to the manual reset device, and the other end of the metal base is provided with an electrode end.

4. A manually reset thermal protector according to claim 3, characterized in that The stationary contact assembly includes an insulating seat and a stationary contact piece. The insulating seat is connected to one end of the metal base close to the opening. The stationary contact piece is connected to the insulating seat, and one end of the stationary contact piece is elastically in contact with the movable end of the moving contact piece. The other end of the stationary contact piece extends out of the insulating seat and constitutes another electrode end.

5. A manually reset thermal protector according to claim 3, characterized in that : The manual reset device includes an insulating push rod and a button, the button is connected to the top of the insulating push rod; the insulating push rod slides linearly between the manual reset bracket and the shell, the bottom end of the insulating push rod extends into the shell and is adjacent to or against the moving contact piece, and the insulating push rod or the button is provided with a manual limiting structure limited between the manual reset bracket and the shell.

6. A manually reset thermal protector according to claim 5, characterized in that : The top end of the insulating push rod is connected to one end of the button, and the other end of the button is provided with a guide through hole. The housing is provided with a guide protrusion which forms a linear sliding fit with the guide through hole.

7. A manually reset thermal protector according to claim 6, characterized in that : The shell is provided with an L-shaped through hole corresponding to the temperature sensing piece assembly, the manual reset bracket is provided with an L-shaped guide hole overlapping with the L-shaped through hole, one end of the L-shaped through hole and the L-shaped guide hole is provided with a push rod installation entrance, and the insulating push rod slides directly at the other end of the L-shaped through hole and the L-shaped guide hole.

8. A manually reset thermal protector according to any one of claims 5 to 7, characterized in that : The manual limiting structure includes a limiting ring, which is integrally connected to the middle position of the insulating push rod, and the limiting ring is limited and slid between the manual reset bracket and the shell.

9. A manually reset thermal protector according to claim 4, characterized in that A metal sheet is connected to the insulating seat by integral injection molding, one end of the metal sheet is exposed on the surface of the insulating seat to form a static contact sheet, and the other end of the metal sheet extends out of the insulating seat to form an electrode terminal.

10. A manually reset thermal protector according to claim 4, characterized in that The insulating seat is placed on top of the metal base, and a pair of pressing ears are integrally extended from the metal base and arranged on the left and right sides of the insulating seat. The pressing ears are riveted to the upper surface of the insulating seat to connect the metal base and the insulating seat.

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