A surge-resistant power thermistor structure

Abstract

This utility model discloses a surge-resistant power thermistor structure, relating to the field of thermistor technology. The connection structure includes a housing, a thermistor wire fixedly connected inside the housing, and a connecting rod fixedly connected to the center of the thermistor wire. The protection structure includes a connector adapted to the bottom of the connection hole and a wire fixedly connected to the bottom of the connector. The advantages of this utility model are: the negative temperature coefficient of the thermistor wire allows for rapid response to surge current; combined with the rigid fixation of the connecting rod and fixing block, it ensures that the resistance wire does not deform or break during a surge, continuously and stably limiting the current; the fixing screws of the connector enhance the electrical connection strength, and the fixing ring prevents the wire from being pulled loose, providing double protection against circuit failures caused by poor contact during surges; the heat dissipation holes in the housing and the heat conduction of the connecting plate work together to ensure that the resistance wire cools down and resets quickly after a surge, extending its service life.

Description

Technical Field

[0001] This utility model belongs to the field of thermistor technology, specifically relating to a power thermistor structure resistant to surge impact. Background Technology

[0002] A thermistor is a semiconductor resistive element that is extremely sensitive to temperature changes. Its core characteristic is that its resistance changes significantly with temperature. This temperature-resistance characteristic is used to sense, control, or protect circuits. Power thermistors, as key components for suppressing surge currents in electronic devices, are widely used in power supplies, motor drives, and other circuits. Traditional power thermistors suffer from the following drawbacks: insufficient surge resistance, easily leading to wire breakage due to structural vibration under strong surge currents; loose electrical connections resulting in large fluctuations in contact resistance, affecting surge suppression effectiveness; poor heat dissipation, with slow temperature reduction after a surge, prolonging circuit recovery time; and poor overall structural stability and insufficient insulation, making them unsuitable for complex operating environments. Summary of the Invention

[0003] The purpose of this invention is to provide a power thermistor structure that is resistant to surge impact, thereby solving the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A surge-resistant power thermistor structure, including The connection structure includes a housing, a thermistor wire fixedly connected inside the housing, and a connecting rod fixedly connected to the center of the thermistor wire, wherein the end of the thermistor wire is provided with a connection hole; The protective structure includes a connector adapted to be connected to the bottom of the connection hole, and a wire fixedly connected to the bottom of the connector, wherein a fixing screw is provided on the outer surface of the connector.

[0005] As a preferred embodiment of this utility model, a retaining ring is installed at the contact point between the wire and the end of the outer shell, and the inner surface of the retaining ring is provided with anti-slip texture.

[0006] As a preferred embodiment of this utility model, an anti-slip ring is fixedly connected to the end of the wire, and the outer surface of the anti-slip ring is provided with vertical stripes.

[0007] In a preferred embodiment of this utility model, a connecting plate is fixedly connected to the side wall of the thermistor wire, a fixing block is connected to the lower end face of the connecting plate, a slot is provided on the side wall of the connecting plate to cooperate with the fixing block, and the end of the fixing block is inserted into the inner wall of the connecting plate.

[0008] In a preferred embodiment of this utility model, the outer shell surface is provided with heat dissipation holes, and the connecting plate is sleeved on the side wall of the outer shell.

[0009] In a preferred embodiment of this utility model, an insulating plate is fixedly connected to the side wall of the outer shell, and the insulating plate is fixed to the side wall of the connecting plate by screws.

[0010] In a preferred embodiment of this utility model, a spring sheet is fixedly connected to the side wall of the insulating plate, and the side wall of the spring sheet is snapped into the side wall of the connecting plate.

[0011] Compared with related technologies, the surge-resistant power thermistor structure provided by this utility model has the following advantages: the negative temperature coefficient of the thermistor wire can quickly respond to surge current, and the rigid fixation of the connecting rod, fixing block and other structures ensures that the resistance wire does not deform or break during a surge, and continuously and stably limits the current; the fixing screw of the connector enhances the electrical connection strength, and the fixing ring prevents the wire from being pulled loose, thus avoiding circuit failures caused by poor contact during a surge; the heat dissipation holes of the outer shell and the heat conduction of the connecting plate work together to ensure that the resistance wire cools down and resets quickly after a surge, extending its service life; the vertical stripe design of the anti-slip ring facilitates installation and maintenance, and the overall structure is compact and adaptable to various circuit layouts. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a front structural diagram of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the thermistor wire of this utility model; Figure 4 The diagram shows a detachable structure of the connecting plate and fixing block of this utility model.

[0013] In the diagram: 100, connecting structure; 101, outer shell; 102, thermistor wire; 103, connecting rod; 104, connecting hole; 105, connecting plate; 106, fixing block; 200, protective structure; 201, connector; 202, wire; 203, fixing ring; 204, anti-slip ring; 205, insulating plate; 206, spring. Detailed Implementation

[0014] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0015] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0016] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0017] Example: Please see Figure 1-4 This utility model provides a surge-resistant power thermistor structure, comprising: The connection structure 100 includes a housing 101, a thermistor wire 102 fixedly connected inside the housing 101, and a connecting rod 103 fixedly connected to the center of the thermistor wire 102. The thermistor wire 102 is provided with a connection hole 104 at its end. The protective structure 200 includes a connector 201 adapted to be connected to the bottom of the connection hole 104, and a wire 202 fixedly connected to the bottom of the connector 201. The outer surface of the connector 201 is provided with a fixing screw.

[0018] Specifically, the outer casing 101 is made of high-temperature resistant insulating material, forming a closed chamber inside to enclose and protect core components such as the thermistor wire 102, isolating them from external environmental interference, and providing a mounting reference for internal components. Its surface has evenly distributed heat dissipation holes to quickly dissipate internal heat and prevent overheating damage. The thermistor wire 102 is fixedly connected inside the outer casing 101 and is the core component for surge protection and power control. Its end has a connection hole 104 for connecting to an external circuit. The connecting rod 103, made of high-strength insulating material, is fixedly connected to the center of the thermistor wire 102, running through the entire wire, providing support and fixation to prevent deformation or breakage under surge impact or vibration. The connection hole 104 is a circular through-hole at the end of the thermistor wire 102 with a smooth inner wall, adapted to the connector 201, providing an interface for the electrical connection between the thermistor wire and the conductor 202.

[0019] Furthermore, the connecting plate 105 is made of a thin metal plate, such as copper or aluminum alloy, and is fixedly connected to the side wall of the thermistor wire 102. It is ring-shaped or sheet-shaped and sleeved on the side wall of the outer shell 101. It cooperates with the fixing block 106 through a slot to enhance the structural stability of the thermistor wire and also assist in heat conduction. The fixing block 106 is a block structure made of rigid insulating material. Its end is inserted into the slot in the inner wall of the connecting plate 105 to form a rigid connection with the connecting plate, further fixing the thermistor wire 102 and preventing it from shifting or vibrating under surge impact. The connector 201 is made of a metal with excellent conductivity and is fitted to the bottom of the connecting hole 104 to form an electrical connection with the thermistor wire 102. Its outer surface is provided with fixing screws, which enhance the connection strength with the connecting hole 104 through the threaded fastening action and prevent loosening of the contact. The wire 202 is made of multi-strand copper core wire with an outer insulation layer and is fixedly connected to the bottom of the connector 201 for connecting the thermistor to the external circuit to transmit current signals.

[0020] Preferably, the retaining ring 203 is a ring-shaped structure made of elastic insulating material, installed at the contact point between the conductor 202 and the end of the housing 101. Its inner surface has finely textured anti-slip protrusions that tightly wrap around the conductor through compression deformation, preventing the connector 201 from loosening when the conductor is pulled, while also enhancing the sealing of the housing end. The anti-slip ring 204 is made of rubber and is fixedly connected to the end of the conductor 202. Its outer surface has vertical stripes parallel to the conductor axis, increasing hand grip friction and facilitating insertion and removal of the conductor end from the external interface, while also preventing slippage during insertion and removal. The conductor slips and is damaged; the insulating plate 205 is fixedly connected to the side wall of the outer shell 101 and fastened to the side wall of the connecting plate 105 with screws, which isolates the outer shell from the external metal structure, prevents leakage or short circuit, and improves the overall insulation performance; the spring piece 206 is made of elastic metal and is fixedly connected to the side wall of the insulating plate 205. It is bent and its side wall is engaged in the groove of the side wall of the connecting plate 105. It generates continuous pressure through elastic deformation, which enhances the connection stability between the insulating plate 205 and the connecting plate 105. At the same time, it can absorb vibration or impact energy and buffer the mechanical stress caused by surge.

[0021] It should be noted that when a surge current of large magnitude occurs in the circuit, the thermistor wire 102, due to its negative temperature coefficient, experiences a rapid increase in resistance with increasing temperature. This surge current generates a large amount of heat, quickly limiting the current and preventing damage to downstream circuit components from excessive current. After the surge, the wire temperature decreases, the resistance returns to normal, and the circuit resumes conduction. The connecting rod 103, combined with the fixing block 106 and connecting plate 105, provides double internal and external fixation for the thermistor wire 102, preventing deformation or breakage under the electromagnetic force or thermal stress generated by the surge, thus ensuring the integrity of the wire structure. The fixing screws of the connector 201 and the fixing ring 203 work together to ensure a stable electrical connection between the thermistor wire 102 and the conductor 202, preventing arcs or sparks caused by poor contact during surges and improving the reliability of the electrical connection. The heat dissipation holes of the housing 101 cooperate with the connecting plate 105 to quickly dissipate the large amount of heat generated by the resistance wire during surges, preventing the housing from overheating and deforming, and preventing the resistance wire from failing due to overheating. The insulating plate 205 blocks the conductive path between the housing and the outside, and the spring piece 206 absorbs the impact energy through elastic snap-fit, reducing the impact of external vibration on the internal structure, and taking into account both insulation and impact resistance performance.

[0022] In summary, the negative temperature coefficient of the thermistor wire allows for rapid response to surge currents. Combined with the rigid fixation of the connecting rod and fixing block, this ensures the wire remains undeformed and unbroken during surges, continuously and stably limiting current. The fixing screws on the connector enhance electrical connection strength, while the fixing ring prevents the wire from loosening due to pulling. This dual protection prevents circuit failures caused by poor contact during surges. The heat dissipation holes on the outer shell and the heat conduction of the connecting plate work together to ensure the wire cools and resets quickly after a surge, extending its service life. The vertical stripe design of the anti-slip ring facilitates installation and maintenance. The overall structure is compact and adaptable to various circuit layouts.

[0023] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible without substantially departing from the novel teachings and advantages of the subject matter described in this application. For example, variations in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​such as temperature, pressure, etc., installation arrangements, use of materials, color, orientation, etc. For instance, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of this utility model. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0024] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments may be described, i.e., those features that are not relevant to the currently considered best mode for carrying out the present invention, or those features that are not relevant to implementing the present invention.

[0025] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0026] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A power thermistor structure resistant to surge impact, characterized by, include: The connection structure (100) includes a housing (101), a thermistor wire (102) fixedly connected inside the housing (101), and a connecting rod (103) fixedly connected to the center of the thermistor wire (102). The thermistor wire (102) has a connection hole (104) at its end. The protective structure (200) includes a connector (201) adapted to be connected to the bottom of the connection hole (104) and a wire (202) fixedly connected to the bottom of the connector (201), wherein the outer surface of the connector (201) is provided with a fixing screw.

2. The power thermistor structure according to claim 1, wherein: A retaining ring (203) is installed at the contact point between the conductor (202) and the end of the outer shell (101), and the inner surface of the retaining ring (203) is provided with anti-slip texture.

3. The power thermistor structure according to claim 2, wherein: The end of the conductor (202) is fixedly connected to an anti-slip ring (204), and the outer surface of the anti-slip ring (204) is provided with vertical stripes.

4. The power thermistor structure according to claim 3, wherein: A connecting plate (105) is fixedly connected to the side wall of the thermistor wire (102). A fixing block (106) is connected to the lower end face of the connecting plate (105). A slot is provided on the side wall of the connecting plate (105) to cooperate with the fixing block (106). The end of the fixing block (106) is inserted into the inner wall of the connecting plate (105).

5. The power thermistor structure according to claim 4, wherein: The outer shell (101) has heat dissipation holes on its surface, and the connecting plate (105) is sleeved on the side wall of the outer shell (101).

6. The power thermistor structure according to claim 5, wherein: An insulating plate (205) is fixedly connected to the side wall of the outer shell (101), and the insulating plate (205) is fixed to the side wall of the connecting plate (105) by screws.

7. The power thermistor structure according to claim 6, wherein: The insulating plate (205) has a spring piece (206) fixedly connected to its side wall, and the side wall of the spring piece (206) is snapped into the side wall of the connecting plate (105).

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