Temperature control switch

Abstract

The utility model relates to temperature control switch, including conductive casing, first terminal and second terminal, the insulating piece is arranged in the conductive casing, be provided with static contact piece on the insulating piece, static contact piece with conductive casing opposite insulating arrangement, first terminal and second terminal respectively with conductive casing and static contact piece conductive connection, the movable contact that still is provided with with static contact piece contact conduction in the conductive casing, movable contact is deformed after heat, movable contact and static contact piece separate, movable contact directly with conductive casing fixed conduction. Adopt above technical scheme, the utility model through movable contact and conductive casing can realize direct connection through riveting and welding etc. forms, eliminated the thermal resistance of intermediate component in traditional structure, and heat transfer is directly efficient, so that switch action is more sensitive, timely, simplifies the part quantity and assembly technology simultaneously, saves the cost.

Description

Technical Field

[0001] This utility model belongs to the field of switch technology, and particularly relates to temperature control switches. Background Technology

[0002] Temperature control switches are widely used in various electrical products. They provide safety protection by disconnecting the circuit when the temperature is too high. Their core principle is to use the thermal element to deform when heated to drive the separation of the contacts.

[0003] A typical structure currently available on the market has a temperature-sensing actuating component, which is usually a bimetallic strip or a similar moving contact piece. This component is first fixed to an additional, independent metal strip on the metal shell. This metal strip is then fixed to the inner wall of the metal shell by riveting or other methods. This multi-layered structure of the temperature-sensing component, the intermediate metal strip, and the shell not only leads to low heat transfer efficiency, but also results in complex manufacturing processes and high costs due to the independent intermediate metal strip. Furthermore, the multi-layered stacking and fixing introduces more assembly errors and makes the component prone to loosening due to vibration, resulting in poor structural stability. Summary of the Invention

[0004] The purpose of this utility model is to overcome the defects of the prior art by providing a temperature control switch, which solves the problems of complex manufacturing process and low heat transfer efficiency of the temperature sensing action component connected to the outer shell through the intermediate metal sheet.

[0005] The technical solution of this utility model is a temperature control switch, including a conductive housing, a first terminal and a second terminal. An insulating component is provided inside the conductive housing, and a stationary contact is fixedly provided on the insulating component. The stationary contact is insulated from the conductive housing. The first terminal and the second terminal are electrically connected to the conductive housing and the stationary contact, respectively. A movable contact is also provided inside the conductive housing. After the movable contact is heated and deformed, the movable contact and the stationary contact separate, and the movable contact is directly fixed and conductive to the conductive housing.

[0006] By adopting the above technical solution, the moving contact and the conductive housing can be directly fixedly connected by riveting and welding, eliminating the thermal resistance caused by intermediate components in the traditional structure. The heat transfer is direct and efficient, making the switching action more sensitive and timely. At the same time, it simplifies the number of parts and assembly process, saving costs. In addition, the direct connection optimizes mechanical strength and vibration resistance. The direct and firm connection ensures the stability of the thermal deformation action and extends the product service life.

[0007] A further feature of this invention is that the stationary contact piece and the insulating component are fixedly connected by a snap-fit ​​structure.

[0008] With the above-mentioned further configuration, the stationary contact piece is snapped onto the insulating component via a snap-fit ​​structure, eliminating the need for welding and additional fasteners such as screws, rivets, or complex clamps to fix the stationary contact piece, thus optimizing the assembly process and reducing assembly costs.

[0009] A further feature of this invention includes a single pin, which passes through the conductive housing and is electrically connected to the stationary contact piece. The pin is insulated from the conductive housing, and the first terminal is directly and fixedly connected to the conductive housing and conducts electricity.

[0010] By adopting the above-mentioned further settings, it is ensured that the current flows through the circuit controlled by the moving contact and the stationary contact, thus guaranteeing the realization of the switching function and achieving reliable electrical isolation from the conductive housing.

[0011] A further feature of this invention is that the pin and the conductive housing are fixedly connected by an insulating material, and the second terminal and the pin are electrically connected to each other on the outer side of the conductive housing.

[0012] With the above-mentioned further design, the pin structure is easy to insert and suitable for modern electronic assembly. It is fixed to the conductive housing with insulating material, which not only ensures the insulation strength but also provides stable mechanical support.

[0013] A further feature of this invention is that a heating wire is fixedly disposed on the insulating component, the heating wire is connected to the stationary contact and the second terminal, and both ends of the heating wire are fixedly connected to the stationary contact and the pin, respectively.

[0014] With the above-described further configuration, the heating wire is connected to the stationary contact piece and the pin respectively, thereby enabling the stationary contact piece and the second terminal to conduct electricity, thus achieving the connection of the conductive path.

[0015] Further features of this invention: The buckle structure includes a buckle hole on the stationary contact piece and a buckle block protruding from the top of the insulating component. The middle parts of the side walls on both sides of the buckle block protrude outward to form a triangular structure. Spring pieces are provided on both sides of the buckle hole.

[0016] With the above-mentioned further configuration, the triangular protrusions on both sides of the card block form guiding ramps. When the stationary contact is pressed against the insulating component, the ramps will first contact the two spring pieces on the side of the card hole. Under continuous pressure, the ramps will generate a horizontal component force, easily pushing the spring pieces outward, allowing the card block to slide smoothly into the card hole. Once the triangular protrusion of the card block completely crosses the inner edge of the spring piece, the spring piece will rebound due to its own elastic restoring force. The other ramp of the protrusion of the card block will interlock with the inner side of the spring piece, thus firmly fixing the position of the stationary contact and avoiding problems such as changes in contact pressure, increased contact resistance, or even instantaneous power failure caused by loose components.

[0017] A further feature of this invention is that the conductive housing includes a base and a cover covering the base, with the base and the cover being sealed together.

[0018] With the above-mentioned further configuration, the sealing of the conductive housing can protect the internal component structure from the influence of the external environment, and can be filled with inert gas to further protect the internal structure and components, ensuring the stability of its long-term performance.

[0019] A further feature of this invention is that the bottom surface of the insulating component and the top surface of the base are respectively provided with matching protrusions and grooves.

[0020] With the above-mentioned further configuration, the insulating component and the base are positioned and installed by the cooperation of protrusions and grooves, which increases the accuracy of the position of the conductive seat and stationary contact piece set on the top of the insulating component. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present utility model; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of a half-section of the present invention; Figure 4 This is a schematic diagram of the riveted heating wire structure in this utility model; Figure 5 This is a schematic diagram of the welded heating wire structure in this utility model; Figure 6 This is a schematic diagram of the overall structure of the insulating component in this utility model; Figure 7 This is a schematic diagram of the overall structure of the conductive base in this utility model; Figure 8 This is a schematic diagram of the overall structure of the insulating component from another perspective in this utility model; Figure 9 This is a schematic diagram of the overall structure of Embodiment 2 of this utility model; Figure 10 This is a schematic diagram of the overall structure of the dome-shaped cover of this utility model; Figure 11 for Figure 10 A schematic diagram of the half-section structure.

[0022] In the diagram: 1. Conductive housing; 11. Base; 12. Cover; 2. First terminal; 3. Second terminal; 4. Insulating component; 41. Locking block; 5. Stationary contact piece; 51. Locking hole; 52. Spring piece; 6. Moving contact piece; 8. Heating wire; 9. Insulating housing; 10. Pin. Detailed Implementation

[0023] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] It should be noted that in the description of this utility model, all directional indicators (such as up, down, forward, backward, etc.) are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0025] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a number" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] like Figure 1-11 As shown, the temperature control switch provided in this embodiment includes a conductive housing 1 and a first terminal 2 and a second terminal 3 that are connected to the outside.

[0027] The temperature control switch includes a conductive housing 1 consisting of a base 11 and a cover 12. The base 11 and the cover 12 are pressed and sealed to form a sealed cavity. This sealing structure can effectively prevent external dust and moisture from entering and protect internal components. Optionally, an inert gas can be filled in before sealing to further inhibit internal oxidation and arc erosion.

[0028] An insulating component 4 is provided on the base 11 of the conductive housing 1. This insulating component 4 is made of high-temperature resistant ceramic. To ensure installation accuracy, such as... Figure 3 and Figure 8 As shown, the bottom surface of the insulating component 4 is provided with a protrusion, and the top surface of the base 11 is provided with a corresponding groove. The accurate positioning is achieved by the cooperation of the protrusion and the groove.

[0029] A stationary contact piece 5 is fixed to the insulating component 4 by a snap-fit ​​structure, specifically, as shown in the example. Figure 6-7As shown, the snap-fit ​​structure includes a snap-fit ​​block 41 protruding from the top of the insulating member 4 and a snap-fit ​​hole 51 opened on the stationary contact piece 5. The middle of both side walls of the snap-fit ​​block 41 protrudes outward, forming a triangular protrusion. The two sides of the snap-fit ​​hole 51 are provided with elastic spring pieces 52. During assembly, the stationary contact piece 5 is aligned with the insulating member 4 and pressed down. The inclined surface on the upper side of the protrusion of the snap-fit ​​block 41 guides the spring piece 52 to expand outward elastically. When the snap-fit ​​block 41 completely passes through the snap-fit ​​hole 51, the spring piece 52 rebounds, and its inner side forms a mechanical interlock with the inclined surface on the lower side of the protrusion of the snap-fit ​​block 41. The inclined surface can be provided with a concave arc surface to abut the spring piece 52, thereby completing the locking of the spring piece 52 on the snap-fit ​​block 41, thus firmly fixing the stationary contact piece 5 on the insulating member 4 without any additional fasteners.

[0030] Among them, the static contact 5 is made of materials with good conductivity and resistance to arc erosion, such as silver or silver alloy.

[0031] This solution also includes a pin 10 and a heating wire 8. After the pin 10 passes through the base 11 of the conductive housing 1, it is electrically connected to the stationary contact 5 through the heating wire 8. The base 11 of the conductive housing 1 has a through hole. The pin 10 and the through hole are filled and fixed with insulating material by welding or other means to achieve relative fixation and reliable insulation between the pin 10 and the conductive housing 1, ensuring that the current will not short-circuit to the outer shell.

[0032] The heating wire 8 is fixedly mounted on the insulating component 4, and its two ends are respectively fixedly connected to the stationary contact piece 5 and the second terminal 3. Figure 4-5 As shown, it can be fixed by welding or riveting to achieve conductivity.

[0033] In this design, the temperature-sensing actuating component is a movable contact 6. The movable contact 6 is directly fixedly connected to and conducts electricity with the inner wall of the conductive housing 1. The connection method is direct riveting or direct welding, or a combination of both. Preferably, the movable contact 6 is directly fixed to the cover 12. At room temperature, the movable contact 6 maintains contact and conduction with the stationary contact 5, thereby keeping the switch in a closed state. When overheated, the movable contact 6 deforms due to heat and lifts up, disconnecting from the stationary contact 5, thereby keeping the switch in an open state.

[0034] Furthermore, such as Figure 10-11 As shown, in this solution, the top of the cover 12 can be provided with an arc-shaped recess, so that the top surface of the inner cavity of the cover 12 serves as the limiting part of the movable contact 6, which can be resisted after the movable contact 6 is deformed, so as to avoid the movable contact 6 being too deformed and difficult to recover.

[0035] Working principle: At room temperature, the moving contact 6 does not undergo significant deformation and is in close contact with the stationary contact 5. The normal path of the current is: first terminal 2, conductive shell 1, moving contact 6, stationary contact 5, heating wire 8, and then to the second terminal 3, thus realizing circuit conduction. When the ambient temperature of the temperature control switch rises, the heat is directly and efficiently conducted to the moving contact 6 through the conductive housing 1. When the temperature reaches its operating temperature, the moving contact 6 jumps and deforms, quickly separating from the stationary contact 5, cutting off the circuit and realizing overheat protection. After the temperature drops, the moving contact 6 returns to its original shape, and the contact closes again.

[0036] It should be noted that the first terminal 2 and the second terminal 3 are electrically connected to the conductive housing 1 and the pin 10, respectively, so as to connect the temperature control switch to an external power source. Specifically, the forms of the first terminal 2 and the second terminal 3 can be divided into the following two embodiments: Example 1

[0037] like Figure 1-3 As shown, the first terminal 2 and the second terminal 3 are respectively made of metal plate and wiring terminal. The pin 10 is directly inserted into the wiring terminal that serves as the second terminal 3. After the wiring terminal is pressed, the two are fixed and electrically connected. This embodiment also includes an insulating shell 9. The conductive shell 1 is placed on the insulating shell 9. The second terminal 3 can also be fixedly snapped onto the insulating shell 9. The metal plate that serves as the first terminal 2 includes a bent part. The insulating shell 9 is provided with a groove for the bent part of the first terminal 2 to be inserted. After the first terminal 2 abuts against the bottom of the conductive shell 1, the bottom surface of the bent part contacts the bottom surface of the groove of the insulating shell 9, realizing the contact between the first terminal 2 and the conductive shell 1. It should be noted that the connection between the first terminal 2 and the conductive shell 1 can still be strengthened by welding or other means. Example 2

[0038] like Figure 9 As shown, the first terminal 2 and the second terminal 3 are conductive wires. The first terminal 2 is directly fixed to the conductive housing 1 by welding or other means, and the second terminal 3 is also fixed to the pin 10 by welding to achieve conductivity.

[0039] In summary, this solution achieves direct connection between the moving contact 6 and the conductive housing 1 through riveting and welding, eliminating the thermal resistance caused by intermediate components in traditional structures. This direct and efficient heat transfer makes the switching action more sensitive and timely. At the same time, it simplifies the number of parts and assembly process, saving costs. Furthermore, the direct connection optimizes mechanical strength and vibration resistance. The direct and robust connection ensures the stability of the thermal deformation action and extends the product's service life.

[0040] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. A temperature control switch, comprising a conductive housing (1), a first terminal (2), and a second terminal (3), wherein an insulating element (4) is disposed inside the conductive housing (1), and a stationary contact piece (5) is fixedly disposed on the insulating element (4), the stationary contact piece (5) being insulated from the conductive housing (1), the first terminal (2) and the second terminal (3) being electrically connected to the conductive housing (1) and the stationary contact piece (5) respectively, and a moving contact piece (6) is also disposed inside the conductive housing (1) and in contact with the stationary contact piece (5), wherein after the moving contact piece (6) is heated and deformed, the moving contact piece (6) and the stationary contact piece (5) separate, characterized in that, The movable contact (6) is directly connected to the conductive housing (1).

2. The temperature control switch according to claim 1, characterized in that, The stationary contact piece (5) and the insulating component (4) are fixedly installed by a snap-fit ​​structure.

3. The temperature control switch according to claim 1, characterized in that, It also includes a single pin (10), which passes through the conductive housing (1) and is electrically connected to the stationary contact (5). The pin (10) is insulated from the conductive housing (1), and the first terminal (2) is directly fixedly connected to the conductive housing (1) and conducts electricity.

4. The temperature control switch according to claim 3, characterized in that, The pin (10) and the conductive housing (1) are fixedly disposed relative to each other by an insulating material, and the second terminal (3) and the pin (10) are electrically connected to each other on the outer side of the conductive housing (1).

5. The temperature control switch according to claim 1, 2, 3, or 4, characterized in that, A heating wire (8) is fixedly disposed on the insulating component (4), and the heating wire (8) conducts through the stationary contact (5) and the second terminal (3).

6. The temperature control switch according to claim 2, characterized in that, The buckle structure includes a buckle hole (51) on the stationary contact piece (5) and a buckle block (41) protruding from the top of the insulating member (4). The middle part of the side walls on both sides of the buckle block (41) protrudes outward to form a triangular structure. Spring pieces (52) are provided on both sides of the buckle hole (51).

7. The temperature control switch according to claim 5, characterized in that, The heating wire (8) is fixedly connected to the stationary contact plate (5) and the pin (10) at both ends.

8. The temperature control switch according to claim 1, characterized in that, The conductive housing (1) includes a base (11) and a cover (12) covering the base (11), and the base (11) and the cover (12) are sealed together.

9. The temperature control switch according to claim 8, characterized in that, The bottom surface of the insulating component (4) and the top surface of the base (11) are respectively provided with matching protrusions and grooves.

10. The temperature control switch according to claim 1, characterized in that, The movable contact (6) is directly riveted or welded to the conductive housing (1).

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