High-precision temperature protector

Abstract

The utility model relates to temperature protector technical field especially relates to a high accuracy temperature protector, include: insulating seat, set up accommodating cavity, set up through -hole in accommodating cavity, set up locating strip on insulating seat, static contact, set up in through -hole, temperature sensing element, one end is fixedly connected with the side of insulating seat away from static contact, the other end extends towards static contact, moving contact, set up on temperature sensing element, with static contact opposite setting, shell, cover in insulating seat, shell top surface is step -like structure, including first plane and second plane, the plane extension direction parallelly arranged of first plane and second plane, it is connected through inclined plane between first plane and second plane, wherein, locating strip abuts against first plane. Through the cooperation of first plane and locating strip of the utility model, the problem that the assembly is unstable due to the gap during assembly is avoided, and the assembly stability is improved.

Description

Technical Field

[0001] This utility model relates to the field of temperature protector technology, and in particular to a high-precision temperature protector. Background Technology

[0002] High-precision temperature protectors are safety protection components widely used in electrical appliances, motors, batteries, and various industrial equipment. Their core function is to automatically and quickly cut off the circuit when the temperature of the protected object rises to a preset, precise critical value—the operating temperature—thus preventing damage to the equipment due to overheating, or even fires and other safety accidents. Unlike conventional temperature controllers, the key feature of high-precision temperature protectors is their extremely high accuracy and consistency in operating temperature, with a very small error range. They typically function as a one-time or resettable final safety barrier.

[0003] In existing technologies, a common high-precision temperature protector typically includes an insulating base, a stationary contact mounted on the insulating base, a temperature sensing element, and a moving contact fixed to the end of the temperature sensing element. To protect the internal structure and ensure electrical insulation, the entire assembly is encapsulated in a metal or plastic housing. The top surface of the housing has a central recess, and the edge areas are prone to developing minute arc structures during processing. When the insulating base is assembled with the housing, these arc structures can cause gaps at the assembly surfaces, preventing a tight and uniform fit.

[0004] Therefore, a high-precision temperature protector is needed to reduce assembly gaps and eliminate the need for curved structures. The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] This invention provides a high-precision temperature protector, which uses a stepped structure on the top surface of the outer shell to cooperate with the positioning strip on the insulating base, thus solving the assembly gap problem caused by deformation of the outer shell during processing.

[0006] To achieve the above objectives, this utility model provides a high-precision temperature protector, comprising: An insulating base is provided with a receiving cavity, and a through hole is formed in the receiving cavity. A positioning strip is provided on the insulating base. A stationary contact is disposed within the through hole; The temperature sensing element has one end fixedly connected to the side of the insulating base away from the stationary contact, and the other end extends toward the stationary contact; A moving contact is disposed on the temperature sensing element and is positioned opposite to the stationary contact. The outer shell is fitted onto the insulating base. The top surface of the outer shell has a stepped structure, including a first plane and a second plane. The planes containing the first plane and the second plane are arranged parallel to each other in their extending directions. The first plane and the second plane are connected by an inclined plane. The positioning strip abuts against the first plane.

[0007] Furthermore, a positioning groove is provided on the side of the insulating base away from the through hole, and the temperature sensing element is embedded in the positioning groove.

[0008] Furthermore, the end of the stationary contact near the moving contact is riveted to the through hole.

[0009] Furthermore, one end of the temperature sensing element is fixedly connected to the insulating base via a welding point.

[0010] Furthermore, an arc-shaped groove is provided at one end of the temperature sensing element near the welding point.

[0011] Furthermore, both the insulating base and the outer shell are elliptical in shape.

[0012] Furthermore, the temperature sensing element adopts a bimetallic strip structure.

[0013] Furthermore, the positioning strip extends along the edge of the insulating base until both ends of the positioning strip are close to the inclined surface, and the upper end face of the positioning strip abuts against the inner wall of the outer casing.

[0014] Furthermore, the insulating base is made of high-temperature resistant engineering plastic or ceramic material.

[0015] Furthermore, a gap is left between the moving contact and the stationary contact.

[0016] The following technical effects can be achieved through the technical solution of this utility model: By using a stepped structure on the top surface of the outer shell to cooperate with the positioning strip on the insulating base, the problem of assembly gap caused by deformation of the outer shell during processing is solved. The first plane on the top surface of the outer shell provides a precise and stable axial positioning reference surface for the positioning strip, effectively avoiding the drawback of irregular protrusions or arcs at the edges that affect the fit. Through the reliable contact between the positioning strip and the first plane, a tight and uniform assembly between the outer shell and the insulating base is achieved, ensuring the cleanliness and stability of the environment where the internal moving and stationary contacts are located. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the high-precision temperature protector in an embodiment of this utility model; Figure 2 This is a schematic diagram of the bottom structure of the high-precision temperature protector in an embodiment of this utility model; Figure 3 This is a schematic diagram of the structure of the insulating base and the temperature sensing element in the embodiment of this utility model; Figure 4 This is a schematic diagram of the structure of the insulating base in an embodiment of this utility model; Figure 5 This is a schematic diagram of the internal structure of the outer shell in an embodiment of this utility model; Figure 6 This is a top view of the high-precision temperature protector in an embodiment of this utility model; Figure 7 for Figure 6 Sectional view at point AA.

[0019] Reference numerals: 1. Insulating base; 11. Receiving cavity; 111. Through hole; 12. Positioning strip; 13. Positioning groove; 2. Stationary contact; 3. Temperature sensing element; 31. Welding point; 32. Arc groove; 4. Moving contact; 5. Housing; 51. First plane; 52. Second plane; 53. Inclined surface. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] This utility model provides a method such as Figures 1 to 7 The high-precision temperature protector shown includes: An insulating base 1 is provided with a receiving cavity 11, and a through hole 111 is opened in the receiving cavity 11. A positioning strip 12 is provided on the insulating base 1. The stationary contact 2 is disposed inside the through hole 111; The temperature sensing element 3 has one end fixedly connected to the side of the insulating base 1 away from the stationary contact 2, and the other end extends toward the stationary contact 2; The moving contact 4 is mounted on the temperature sensing element 3 and is positioned opposite to the stationary contact 2. The outer shell 5 is fitted onto the insulating base 1. The top surface of the outer shell 5 has a stepped structure, including a first plane 51 and a second plane 52. The planes containing the first plane 51 and the second plane 52 are arranged in parallel directions. The first plane 51 and the second plane 52 are connected by an inclined surface 53. The positioning strip 12 abuts against the first plane 51.

[0023] The specific working principle of this utility model is as follows: Taking the normally closed type as an example, under normal temperature, the temperature sensing element 3 remains in its initial state, the moving contact 4 is in contact with the stationary contact 2, and the circuit is connected. When the temperature of the protected object rises and is transmitted to the temperature sensing element 3, the temperature sensing element 3 bends due to heat. When the temperature reaches the preset precise action value, the bending amount of the temperature sensing element 3 is sufficient to overcome the pressure between the contacts, quickly pushing the moving contact 4 to separate from the stationary contact 2, cutting off the circuit, and realizing overheat protection. When the temperature drops, the temperature sensing element 3 returns to its original state, and the moving contact 4 and the stationary contact 2 re-contact, or manual reset is required.

[0024] In the existing technology, the edge area of ​​the top surface of the housing 5 is prone to uncontrollable micro-arc protrusions due to processing stress. This causes the positioning strip 12 of the insulating seat 1 to be unable to fit completely tightly with the inner wall of the housing 5, thus leaving assembly gaps. These gaps not only reduce the structural stability of the product in a vibration environment, but also become channels for moisture and dust to enter, seriously threatening the contact reliability between the internal moving contact 4 and the stationary contact 2, and ultimately causing the protector's action accuracy to drift or even fail.

[0025] In this embodiment, the top surface of the outer shell 5 is configured as a stepped structure consisting of a first plane 51, a second plane 52, and a connecting inclined plane 53. This provides an absolutely flat, stable, and easily controllable axial positioning reference surface for the positioning strip 12 on the insulating base 1, namely the first plane 51. Through the flat first plane 51, when the outer shell 5 is installed onto the insulating base 1, the positioning strip 12 extends into the outer shell 5 along the inner wall of the outer shell 5. The inner wall of the outer shell 5 cooperates with the positioning strip 12 to guide the installation until the positioning strip 12 abuts against the first plane 51. At this time, the insulating base 1 is just inserted into the stepped groove on the top surface of the outer shell 5, ensuring that there is no shaking after the outer shell 5 and the insulating base 1 are assembled, reducing the assembly gap, forming a stable whole, and avoiding irregular offsets and gaps caused by the uneven top surface of the outer shell 5 and the installation of the insulating base 1. This protects the internal temperature sensing element 3 within the insulating base 1 and the outer shell 5.

[0026] In some embodiments of this utility model, such as Figure 4 As shown, a positioning groove 13 is provided on the side of the insulating base 1 away from the through hole 111, and the temperature sensing element 3 is embedded in the positioning groove 13. The positioning groove 13 pre-positions and limits the temperature sensing element 3 before the welding process, preventing the temperature sensing element 3 from sliding slightly due to operation or thermal stress during the welding process, and also avoiding the possibility of the temperature sensing element 3 shifting towards both ends of the insulating base 1 inside the outer shell 5.

[0027] In some embodiments of this utility model, such as Figure 7 As shown, the end of the stationary contact 2 closest to the moving contact 4 is riveted to the through hole 111. Riveting is achieved by inserting the stationary contact 2 into the through hole 111 and then applying pressure to the part of the stationary contact 2 that needs to be fixed using a special riveting tool. This causes the local material to undergo plastic deformation and tightly fill or even expand to the surrounding area of ​​the through hole 111, thereby firmly fixing the stationary contact 2 to the through hole 111. This allows it to withstand greater pulling force and vibration, effectively preventing the stationary contact 2 from loosening or falling off due to external force or long-term vibration during use, and ensuring the long-term mechanical stability of the internal electrical connection.

[0028] In some embodiments of this utility model, such as Figure 7 As shown, one end of the temperature sensing element 3 is fixedly connected to the insulating base 1 via a welding point 31. The welding point 31 is a connection area formed by melting a specific solder. It is preferably a method that can provide a high-strength and high-reliability connection, such as resistance welding, laser welding, or high-temperature brazing, to firmly combine the fixed end of the temperature sensing element 3 with the predetermined welding area on the insulating base 1. This ensures that the temperature sensing element 3 will not loosen or shift under repeated operation and vibration, thus guaranteeing the stability of the operating parameters.

[0029] In some embodiments of this utility model, such as Figure 3As shown, an arc-shaped groove 32 is provided at one end of the temperature sensing element 3 near the welding point 31. Preferably, an arc-shaped groove 32 can be provided on both sides of the temperature sensing element 3 relative to the welding point 31. The welding point 31 is the fixed connection point in the temperature protector, but it is prone to heat accumulation under high current operation or high temperature environment. The arc-shaped groove 32 significantly increases the heat dissipation surface area by changing the geometry of the temperature sensing element 3, optimizes the heat conduction path, and allows the heat accumulated near the welding point 31 to be dissipated to the surrounding environment more quickly through the metal body of the temperature sensing element 3, effectively reducing the temperature peak of the welding point 31 during steady-state operation.

[0030] In some embodiments of this utility model, such as Figures 1 to 6 As shown, both the insulating base 1 and the outer shell 5 are elliptical. The receiving cavity 11, through hole 111 and positioning strip 12 of the insulating base 1 are adaptively arranged within the elliptical outline. The outer shell 5 is also set as an elliptical cylindrical structure that matches the elliptical insulating base 1. The non-rotational symmetry of the elliptical shape provides clear orientation during installation, which is convenient for installation and helps to improve the temperature sensing effect of the thermal protector.

[0031] In some embodiments of this invention, the temperature sensing element 3 employs a bimetallic strip structure, which can be made by rolling together two metal or alloy strips with different coefficients of thermal expansion. When the temperature changes, the temperature sensing element 3 bends towards the side with the smaller coefficient of thermal expansion. At room temperature, the bimetallic strip maintains a specific initial shape, keeping the moving contact 4 in a predetermined contact or separation state with the stationary contact 2. When the ambient temperature changes and reaches the set operating temperature, the bimetallic strip undergoes bending deformation, driving the moving contact 4 to move through the displacement of its free end, thus switching the circuit connection between the moving contact 4 and the stationary contact 2. The bimetallic strip's temperature sensing is entirely based on the inherent physical properties of the material, namely the difference in their coefficients of thermal expansion. Its movement is independent of external power supplies or electronic control systems, ensuring that the temperature protection function can still be reliably executed even in extreme cases where the main power supply fails or the control system malfunctions.

[0032] In some embodiments of this utility model, such as Figure 3 and Figure 4As shown, the positioning strip 12 extends along the edge of the insulating base 1 until both ends of the positioning strip 12 are close to the inclined surface 53, and the upper end face of the positioning strip 12 abuts against the inner wall of the outer shell 5. The positioning strip 12 covers most of the edge area of ​​the insulating base 1, so that the contact area between the positioning strip 12 and the inner wall of the outer shell 5 is maximized. It achieves positioning in the axial direction by abutting against the first plane 51, and provides an effective limiting effect in the radial direction through the large-area side contact. It significantly improves the connection stability between the insulating base 1 and the outer shell 5, effectively preventing relative displacement or shaking when the two are subjected to vibration or impact. Furthermore, the positioning strip 12 extends into the interior of the outer shell 5 and abuts against the first plane 51, which also improves the assembly accuracy of the insulating base 1 and the outer shell 5, reduces the assembly gap, and makes the assembly surface flatter and more stable.

[0033] In some embodiments of this utility model, the insulating base 1 is made of high-temperature resistant engineering plastic or ceramic material. Both high-temperature resistant engineering plastic and ceramic materials have extremely high heat distortion temperature and excellent heat resistance. When the temperature protector operates in a high-temperature environment or generates instantaneous high temperature due to the passage of large current, it can effectively resist thermal softening or deformation, maintain the stability of the overall structure and positioning characteristics of the insulating base 1, thereby ensuring the stability of the relative position between the moving contact 4 and the stationary contact 2. The insulating base 1 also has extremely high volume resistivity and surface resistivity, which can reliably prevent leakage or breakdown between the stationary contact 2 and the outer metal shell 5 even in harsh environments with high temperature and high humidity, providing fundamental safety protection for equipment and users.

[0034] In some embodiments of this utility model, such as Figure 7 As shown, a gap is left between the moving contact 4 and the stationary contact 2. The reserved gap provides the necessary and interference-free travel space for the moving contact 4 to move when the temperature sensing element 3 is heated, ensuring that the moving contact 4 can obtain sufficient acceleration and kinetic energy under the drive of the temperature sensing element 3, so as to complete the contact or separation action with the stationary contact 2.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high-precision temperature protector, characterized in that, include: An insulating base (1) is provided with a receiving cavity (11), and a through hole (111) is opened in the receiving cavity (11). A positioning strip (12) is provided on the insulating base (1). A stationary contact (2) is disposed within the through hole (111); The temperature sensing element (3) has one end fixedly connected to the side of the insulating base (1) away from the stationary contact (2), and the other end extends toward the stationary contact (2); The moving contact (4) is disposed on the temperature sensing element (3) and is disposed opposite to the stationary contact (2); The outer shell (5) is fitted onto the insulating base (1). The top surface of the outer shell (5) has a stepped structure, including a first plane (51) and a second plane (52). The planes containing the first plane (51) and the second plane (52) are arranged in parallel directions. The first plane (51) and the second plane (52) are connected by an inclined plane (53). The positioning strip (12) abuts against the first plane (51).

2. The high-precision temperature protector according to claim 1, characterized in that, The insulating base (1) has a positioning groove (13) on the side away from the through hole (111), and the temperature sensing element (3) is embedded in the positioning groove (13).

3. The high-precision temperature protector according to claim 1, characterized in that, The stationary contact (2) is riveted to the through hole (111) at one end near the moving contact (4).

4. The high-precision temperature protector according to claim 1, characterized in that, One end of the temperature sensing element (3) is fixedly connected to the insulating base (1) through a welding point (31).

5. The high-precision temperature protector according to claim 4, characterized in that, An arc-shaped groove (32) is provided at one end of the temperature sensing element (3) near the welding point (31).

6. The high-precision temperature protector according to claim 1, characterized in that, Both the insulating base (1) and the outer shell (5) are elliptical.

7. The high-precision temperature protector according to claim 1, characterized in that, The temperature sensing element (3) adopts a bimetallic strip structure.

8. The high-precision temperature protector according to claim 1, characterized in that, The positioning strip (12) extends along the edge of the insulating base (1) until both ends of the positioning strip (12) are close to the inclined surface (53), and the upper end face of the positioning strip (12) abuts against the inner wall of the outer shell (5).

9. The high-precision temperature protector according to claim 1, characterized in that, The insulating base (1) is made of high-temperature resistant engineering plastic or ceramic material.

10. The high-precision temperature protector according to claim 1, characterized in that, There is a gap between the moving contact (4) and the stationary contact (2).

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