Heat protector element

Abstract

The utility model relates to the technical field of thermal protectors, in particular to a thermal protector element, which comprises a shell, a cover plate, a temperature control mechanism and two wiring terminals, and is characterized in that the shell is provided with an accommodating cavity with an opening at one end, and the temperature control mechanism is horizontally embedded in the accommodating cavity by taking the length of the temperature control mechanism as the direction. The two wiring terminals are vertically fixed at the two ends of the temperature control mechanism respectively, the cover plate covers an opening of the containing cavity in a sealing mode so that the temperature control mechanism can be packaged in the shell, and the two wiring terminals penetrate through the cover plate and extend out of the outer side of the cover plate. The utility model has the advantages of smaller height and more compact overall structure, thereby being capable of being applied to an electric appliance with very exquisite volume, reducing the material consumption and being beneficial to saving the production cost.

Description

Technical Field

[0001] This utility model relates to the field of thermal protector technology, and in particular to a thermal protector element. Background Technology

[0002] Many electrical appliances used in daily life or industry need to operate in humid environments, making waterproofing essential. Thermal protectors, as safety components of electrical appliances, also require waterproofing measures to ensure safe operation. The technical solution disclosed in Chinese utility model patent application number 202021514445.9, entitled "A Thermal Protector with a Sealing Mechanism," involves a base installed inside the outer casing. A moving contact is located at one end of the base extending into the casing via a temperature-sensing element, while a stationary contact is located at the end of the base facing the casing opening. Pins extend into the casing and connect to the stationary contact and the temperature-sensing element, respectively. The casing opening has a mounting groove and a sealing plate. The sealing plate is placed within the mounting groove, which is filled with epoxy resin to form a sealed structure. However, this technology still has the following technical problems in application: the stationary and moving contacts of the thermal protector are arranged along the depth of the housing, which makes the overall length or height of the thermal protector large. The pins are also arranged along the length or height of the thermal protector. This results in the electrical components being too long or too tall, making them unsuitable for use in very compact electrical appliances. Furthermore, the temperature sensing element is located at one end inside the housing, and the pins need to extend deep into the housing to connect with the temperature sensing element, which also consumes more material, resulting in higher production costs.

[0003] In view of the aforementioned technical problems in the prior art, the applicant believes it is necessary to make technical improvements to provide a thermal insulation element with a more compact structure that can be applied to very compact electrical appliances. Utility Model Content

[0004] The purpose of this utility model is to solve the above-mentioned problems and shortcomings, and to provide a thermal insulation element. By making the temperature control mechanism horizontally embedded in the receiving cavity with its length as the orientation, and making the wiring terminals vertically fixed to both ends of the temperature control mechanism, the thermal insulation element has the advantages of small height and more compact overall structure, so that it can be applied to very small electrical appliances, while also reducing material consumption and helping to save production costs.

[0005] The technical solution of this utility model is implemented as follows: a thermal insulation element includes a housing, a cover plate, a temperature control mechanism, and two terminals. The housing is characterized by having a receiving cavity with an opening at one end. The temperature control mechanism is horizontally embedded in the receiving cavity along its length. The two terminals are vertically fixed to both ends of the temperature control mechanism. The cover plate is sealed at the opening of the receiving cavity to encapsulate the temperature control mechanism inside the housing. The two terminals pass through the cover plate and extend outward from the outside of the cover plate.

[0006] Furthermore, the receiving cavity includes a fixed cavity and a movable contact cavity that are connected together, and the height h2 of the movable contact cavity is greater than the height h1 of the fixed cavity.

[0007] Furthermore, the temperature control mechanism includes a fixed part and a movable contact part, which are respectively placed in a fixed cavity and a movable contact cavity, and the two wiring terminals are respectively connected to the fixed part and the movable contact part of the temperature control mechanism.

[0008] Furthermore, the temperature control mechanism includes, from bottom to top, a PTC base, a moving contact, a bimetallic strip, a first rivet, a moving contact disposed on the bottom surface of the moving contact, and a stationary contact electrically connected to the moving contact; the first rivet rivets one end of the PTC base, one end of the moving contact, and one end of the bimetallic strip together to form the fixed part of the temperature control mechanism; the other end of the PTC base, the other end of the moving contact, the other end of the bimetallic strip, the moving contact, and the stationary contact together form the moving contact part of the temperature control mechanism.

[0009] Furthermore, the moving contact also includes a second rivet, and the stationary contact is disposed on the top surface of the second rivet. The second rivet rivets one of the terminals to one end of the PTC base; the first rivet rivets the other terminal to the other end of the PTC base.

[0010] Furthermore, the cavity wall is provided with two clearance grooves for the ends of the first rivet and the second rivet to be inserted respectively.

[0011] Furthermore, the terminal block includes a wiring terminal and a connecting terminal, the wiring terminal extending through the cover plate and out of the outside of the cover plate; the connecting terminal is connected to the PTC base.

[0012] Furthermore, a sealing cavity is formed outside the cover plate in the receiving cavity, the terminals of the two wiring terminals are placed in the sealing cavity, and the sealing cavity is filled with epoxy resin.

[0013] Furthermore, a step is formed between the cavity wall of the receiving cavity and the shell to support the cover plate.

[0014] Furthermore, a support block is provided between the PTC base and the moving contact piece.

[0015] The beneficial effects of this utility model are as follows: In this utility model, the temperature control mechanism is horizontally embedded in the receiving cavity along its length. This means the height of the housing is aligned with the width of the temperature control mechanism. As long as the height of the housing is slightly greater than the width of the temperature control mechanism, it can accommodate and protect the entire mechanism, thus significantly reducing the height of the housing and making the entire thermal protector structure more compact and smaller in size. Furthermore, the two terminals are vertically fixed to both ends of the temperature control mechanism. This prevents unnecessary space along the length of the thermal protector when connecting to other electrical components, resulting in a more compact internal layout. Therefore, this thermal protector is highly suitable for appliances with stringent length or height requirements. Additionally, since both ends of the temperature control mechanism are located at the openings of the receiving cavity, the terminals do not need to extend into the cavity to connect to the temperature control mechanism, saving materials and reducing production costs. 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 schematic diagram of the assembly and disassembly structure of this utility model.

[0018] Figure 3 This is a schematic diagram of the shell structure in this utility model.

[0019] Figure 4 This is a schematic diagram of the assembly structure of the housing, temperature control mechanism and wiring terminals in this utility model.

[0020] Figure 5 This is a three-dimensional exploded view of the temperature control mechanism in this utility model.

[0021] Figure 6 This is a schematic diagram of the structure of the sealed cavity of this utility model after being filled with epoxy resin. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0023] like Figure 1 , 2As shown in Figures 3 and 4, a thermal insulation element includes a housing 1, a cover plate 2, a temperature control mechanism 3, and two terminals 4. To achieve the purpose proposed in this utility model, the housing 1 is provided with a receiving cavity 11 with an opening at one end. The temperature control mechanism 3 is horizontally embedded in the receiving cavity 11 with its length as the orientation. The two terminals 4 are respectively vertically fixed to both ends of the temperature control mechanism 3. The cover plate 2 is sealed and installed at the opening of the receiving cavity 11 to encapsulate the temperature control mechanism 3 inside the housing 1. The two terminals 4 pass through the cover plate 2 and extend out of the outside of the cover plate 2. Since the temperature control mechanism 3 is horizontally embedded in the receiving cavity 11 along its length, and the two terminals 4 are vertically fixed to both ends of the temperature control mechanism 3, the height of the housing 1 is aligned with the width of the temperature control mechanism 3, which greatly reduces the height of the housing 1. Simultaneously, the wiring direction of the terminals 4 is aligned with the height of the housing 1, so wiring does not occupy extra space along the length of the thermal protector. This allows for a more compact internal layout of the electrical components, helping to reduce the size of the electrical appliance and enabling the production of more miniature or compact electrical products. Furthermore, since both ends of the temperature control mechanism 3 are located at the opening of the receiving cavity 11, the terminals 4 do not need to extend into the receiving cavity 11 to connect to the temperature control mechanism 3, saving materials and reducing production costs. During production, the cover plate 2 can be sealed to the opening of the receiving cavity 11 using sealant to achieve the waterproof function of the protector.

[0024] like Figure 3 , 4 As shown, the receiving cavity 11 includes a fixed cavity 111 and a movable contact cavity 112 that are connected together, and the height h2 of the movable contact cavity 112 is greater than the height h1 of the fixed cavity 111. In this way, the fixed cavity 111 can stably position the temperature control mechanism 3, and the movable contact cavity 112 can provide sufficient space for the movement of the temperature control mechanism 3, ensuring that it can play a protective role.

[0025] like Figure 2 , 4 As shown in Figure 5, the temperature control mechanism 3 includes a fixed part 31 and a movable contact part 32. The fixed part 31 and the movable contact part 32 are respectively placed in the fixed cavity 111 and the movable contact cavity 112. The two terminals 4 are respectively connected to the fixed part 31 and the movable contact part 32 of the temperature control mechanism 3. In this way, during assembly, the fixed part 31 is inserted into the fixed cavity 111, and the temperature control mechanism 3 is firmly positioned in the receiving cavity 11 by the limiting effect of the cavity wall of the fixed cavity 111. The movable contact part 32 is placed in the movable contact cavity 112 to ensure that the movable contact part 32 is not disturbed when it is activated, thereby ensuring that the stabilizing mechanism 3 can stably perform its protective function.

[0026] like Figure 2 , 5As shown, the temperature control mechanism 3 includes, from bottom to top, a PTC base 33, a moving contact 34, a bimetallic strip 35, a first rivet 36, a moving contact 37 disposed on the bottom surface of the moving contact 34, and a stationary contact 38 electrically connected to the moving contact 37; the first rivet 36 rivets one end of the PTC base 33, one end of the moving contact 34, and one end of the bimetallic strip 35 together to form the fixing part 31 of the temperature control mechanism 3; the other end of the PTC base 33, the other end of the moving contact 34, the other end of the bimetallic strip 35, the moving contact 37, and the stationary contact 38 together form the moving contact part 32 of the temperature control mechanism 3. In this way, when a circuit malfunctions and the bimetallic strip 35 deforms at high temperature, causing the moving contact 34 to spring upward and separate the moving contact 37 from the stationary contact 38, the PTC base 33 can continuously generate heat to provide heat for the deformation of the bimetallic strip 35, thus maintaining its deformation action and keeping the moving contact 37 and stationary contact 38 separated until the power is manually cut off. This makes the circuit safer and can also effectively avoid material fatigue caused by repeated deformation of the bimetallic strip 35, greatly extending its service life. The PTC base 33 also serves as the base of the temperature control mechanism 3, which helps to simplify the structure of the temperature control mechanism 3, thereby reducing its processing difficulty and size.

[0027] like Figure 2 , 5 As shown, the moving contact 32 also includes a second rivet 39, and the stationary contact 38 is disposed on the top surface of the second rivet 39. The second rivet 39 rivets one of the terminals 4 to one end of the PTC base 33; the first rivet 36 rivets the other terminal 4 to the other end of the PTC base 33. This arrangement of the stationary contact 38 on the top surface of the second rivet 39 simplifies the structure of the temperature control mechanism 3, further reducing its processing difficulty and size.

[0028] like Figure 3 As shown, the cavity wall of the receiving cavity 11 is provided with two relief grooves 113 for the ends of the first rivet 36 and the second rivet 39 to be embedded. This not only allows the two relief grooves 113 to limit the first rivet 36 and the second rivet 39, further enhancing the stability of the temperature control mechanism 3 within the receiving cavity 11, but also reduces the height of the receiving cavity 11, thereby further reducing the volume of the housing 1. At the same time, platforms for supporting the wiring terminal 4 can be formed on the cavity wall of the receiving cavity 11 located on both sides of the relief grooves 113, so that the wiring terminal 4 can also be placed very stably inside the receiving cavity 11, thereby making the positioning of the temperature control mechanism 3 within the receiving cavity 11 more secure.

[0029] like Figure 1 , 2As shown in Figures 4 and 5, the terminal block 4 includes a terminal block 41 and a connecting terminal 42. The terminal block 41 extends through the cover plate 2 and outward from the outside of the cover plate 2; the connecting terminal 42 is connected to the PTC base 33. In this way, the terminal block 4 can be electrically connected to the circuit through the terminal block 41.

[0030] like Figure 1 , 2 As shown in Figures 3 and 6, a sealing cavity 12 is also formed outside the cover plate 2 within the receiving cavity 11. The terminals 41 of the two wiring terminals 4 are placed in the sealing cavity 12, which is also filled with epoxy resin 120. Thus, when the wire 5 is connected to the terminal 41, filling the sealing cavity 12 with epoxy resin 20 completely seals the entire temperature control mechanism 3 and the terminal 41, giving the entire thermal protector excellent waterproofing capabilities, allowing it to be used in humid environments.

[0031] like Figure 2 , 3 As shown in Figure 4, a step 13 is formed between the cavity wall of the receiving cavity 11 and the housing 1 to support the cover plate 2. In this way, the cover plate 2 can be quickly positioned in the receiving cavity 11 through the step 13, which isolates the temperature control mechanism 3 from the sealing cavity 12. Furthermore, when epoxy resin 20 is filled later, it can prevent the cover plate 2 from shifting and causing epoxy resin 20 to enter the fixed cavity 111 and the moving contact cavity 112, thus affecting the normal operation of the temperature control mechanism 3.

[0032] like Figure 5 As shown, a support block 30 is also provided between the PTC base 33 and the moving contact 34. The support block 30 allows the moving contact 34 and the PTC base 33 to be arranged parallel to each other, so that the moving contact 37 and the stationary contact 38 can form a stable, reliable and sufficient contact, thereby ensuring smooth circuit operation.

Claims

1. A thermal protector element, comprising a housing (1), a cover plate (2), a temperature control mechanism (3), two terminal posts (4), characterized in that: The shell (1) is provided with a containing cavity (11) with an opening at one end, the temperature control mechanism (3) is horizontally embedded in the containing cavity (11) with its length as the orientation, the two wire terminals (4) are respectively fixed vertically at the two ends of the temperature control mechanism (3), the cover plate (2) is sealingly covered at the opening of the containing cavity (11) to encapsulate the temperature control mechanism (3) in the shell (1), and the two wire terminals (4) pass through the cover plate (2) and extend out of the cover plate (2).

2. The thermal protector element of claim 1, wherein: The containing cavity (11) comprises a fixed cavity (111) and a movable contact cavity (112) which are connected together, and the height h2 of the movable contact cavity (112) is greater than the height h1 of the fixed cavity (111).

3. The thermal protector element of claim 2, wherein: The temperature control mechanism (3) comprises a fixed part (31) and a movable contact part (32), and the fixed part (31) and the movable contact part (32) are respectively arranged in the fixed cavity (111) and the movable contact cavity (112), and the two wire terminals (4) are respectively connected with the fixed part (31) and the movable contact part (32) of the temperature control mechanism (3).

4. The thermal protector element of claim 3, wherein: The temperature control mechanism (3) comprises a PTC base (33), a movable contact piece (34), a bimetallic piece (35), a first rivet (36), a movable contact point (37) arranged on the bottom surface of the movable contact piece (34), and a static contact point (38) electrically connected with the movable contact point (37), which are sequentially stacked from bottom to top; the first rivet (36) rivets one end of the PTC base (33), one end of the movable contact piece (34) and one end of the bimetallic piece (35) together to form the fixed part (31) of the temperature control mechanism (3); the other end of the PTC base (33), the other end of the movable contact piece (34), the other end of the bimetallic piece (35), the movable contact point (37) and the static contact point (38) together form the movable contact part (32) of the temperature control mechanism (3).

5. The thermal protector element of claim 4, wherein: The movable contact part (32) further comprises a second rivet (39), the static contact point (38) is arranged on the top surface of the second rivet (39), and the second rivet (39) rivets one of the wire terminals (4) at one end of the PTC base (33); the first rivet (36) rivets the other wire terminal (4) at the other end of the PTC base (33).

6. The thermal protector element of claim 5, wherein: The containing cavity (11) is provided with two accommodation grooves (113) on the cavity wall for accommodating the ends of the first rivet (36) and the second rivet (39) respectively.

7. The thermal protector element of claim 5, wherein: The wire terminal (4) comprises a wire end (41) and a connection end (42), the wire end (41) extends out of the cover plate (2), and the connection end (42) is connected with the PTC base (33).

8. The thermal protector element of claim 7, wherein: The containing cavity (11) is further formed with a sealing cavity (12) outside the cover plate (2), the wire end (41) of the two wire terminals (4) is arranged in the sealing cavity (12), and the sealing cavity (12) is further filled with epoxy resin (120).

9. The thermal protector element of claim 2, wherein: The cavity wall of the containing cavity (11) and the shell (1) form a step (13) for supporting the cover plate (2).

10. The thermal protector element of claim 4, wherein: The PTC base (33) and the movable contact piece (34) are further provided with a supporting block (30).

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