Temperature sensor with precisely controllable welding length

Abstract

The application discloses a temperature sensor capable of precisely controlling welding length, which comprises a plastic shell, a thermistor and a metal shell body. The plastic shell is provided with a plastic shell cavity and a connecting end at one end of the plastic shell cavity. Two insertion pieces are vertically connected to the connecting end. One end of the insertion piece protrudes from the connecting end, and the other end extends into the plastic shell cavity. The connecting end is provided with a insertion hole near the insertion piece for inserting resistance lead of the thermistor, so that the resistance lead can be inserted into the connecting end to a predetermined depth and connected to the insertion piece. The metal shell body is sealingly connected to the connecting end, and the thermistor is located at one end of a metal shell cavity of the metal shell body away from the plastic shell body and fixedly connected to the metal shell body through a filler. The thermistor and the resistance lead are both coated with an insulation layer. Thus, the insertion depth of the resistance lead can be limited by the insertion hole, and the welding length of the resistance lead can be precisely controlled.

Description

Technical Field

[0001] This utility model relates to the field of temperature sensor equipment technology, and in particular to a temperature sensor that can accurately control the welding length. Background Technology

[0002] Temperature sensors are indispensable components in modern industry and household appliances, widely used in temperature monitoring and control circuits. Among them, NTC (Negative Temperature Coefficient) thermistors occupy an important position in the field of temperature sensors due to their unique temperature response characteristics.

[0003] However, traditional thermistor welding mainly uses through-hole welding. During the welding process, the welding length is mainly controlled by the operator's skill level, which faces the problem of difficulty in effectively controlling the welding length. This can easily affect the relative position of the NTC inside the sensor, making the temperature sensor measurement results unstable and thus affecting the overall performance of the temperature sensor. Utility Model Content

[0004] This application provides a temperature sensor with precisely controllable welding length, which can precisely control the welding length of the resistor lead, thereby effectively fixing the thermistor inside the sensor, making the temperature measurement results of the temperature sensor more stable, and thus ensuring the performance of the temperature sensor.

[0005] This application provides a temperature sensor capable of precisely controlling welding length, comprising a plastic housing, a thermistor, and a metal housing. The plastic housing has a plastic cavity, and a connecting end is provided at one end of the plastic cavity. Two inserts are vertically connected to the connecting end. One end of each insert protrudes from the connecting end, and the other end extends into the plastic cavity. The connecting end has a socket near the insert for inserting the resistance lead of the thermistor, allowing the resistance lead to be inserted into the connecting end to a predetermined depth and connected to the insert. The metal housing seals the connecting end, and the thermistor is located at the end of the metal cavity of the metal housing away from the plastic housing, and is fixedly connected to the metal housing by a filler. Both the thermistor and the resistance lead are covered with an insulating layer.

[0006] In one possible implementation, the socket is provided with a semi-circular chamfered opening.

[0007] In one possible implementation, the socket further includes a straight portion and a tapered portion, the tapered portion connecting to the straight portion, the straight portion connecting to the inner hole of the semi-circular chamfered opening, the diameter of the straight portion being equal to the diameter of the inner hole and equal to the maximum diameter of the tapered portion, and the resistor lead being clearance-fitted with the straight portion.

[0008] In one possible implementation, the angle between the sidewall of the tapered portion and the central axis of the insertion hole is 1.8 degrees to 2.2 degrees.

[0009] In one possible implementation, the insert has a U-shaped clamp connected to or integrally formed with a U-shaped clamp on the side near the socket at one end protruding from the connection end, the axis of the U-shaped clamp being parallel to the axis of the socket, and the width of the U-shaped clamp being adapted to the diameter of the resistor lead.

[0010] In one possible implementation, the portion of the resistor lead located between the U-shaped clamp and the socket is welded to the insert.

[0011] Beneficial effects: Compared with the prior art, the temperature sensor with precise control of welding length provided in this application can insert the resistance lead into the predetermined depth of the connection end by setting the insertion hole at the connection end of the plastic housing, thereby precisely controlling the welding length of the resistance lead and effectively fixing the thermistor in the sensor, which can make the temperature measurement result of the temperature sensor more stable, thereby ensuring the performance of the temperature sensor.

[0012] These and other objects, features and advantages of this utility model will be fully realized through the following detailed description. Attached Figure Description

[0013] Figure 1 A three-dimensional structural schematic diagram of the temperature sensor that can precisely control the welding length according to this application is shown.

[0014] Figure 2 A cross-sectional structural schematic diagram of the temperature sensor of this application, which can precisely control the welding length, is shown.

[0015] Figure 3 A partial structural schematic diagram of the temperature sensor that allows for precise control of welding length, as described in this application, is shown.

[0016] Figure 4 A partial cross-sectional schematic diagram of the temperature sensor of this application, which can precisely control the welding length, is shown.

[0017] Figure 5 This application shows Figure 4 An enlarged schematic diagram of part A in the middle. Detailed Implementation

[0018] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0019] Those skilled in the art should understand that, in the disclosure of this specification, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0020] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0021] refer to Figures 1 to 5 This application provides a temperature sensor capable of precisely controlling welding length, comprising a plastic housing 10, a thermistor 20, and a metal housing 30. The plastic housing 10 has a plastic cavity 101, and a connection end 11 is provided at one end of the plastic cavity 101. Two inserts 40 are vertically connected to the connection end 11, with one end of each insert 40 protruding from the connection end 11 and the other end extending into the plastic cavity 101. The portion of the insert 40 located within the plastic cavity 101 is used to connect a wire harness, transmitting the resistance signal from the thermistor 20 through the inserts 40 to the control unit. The connection end 11 has a socket 102 near the inserts 40 for inserting the resistance lead 21 of the thermistor 20, allowing the resistance lead 21 to be inserted into the connection end 11 to a predetermined depth and connected to the inserts 40. The metal housing 30 is sealed to the connection end 11, and the thermistor 20 is located at the end of the metal cavity 301 of the metal housing 30 away from the plastic housing 10, and is fixedly connected to the metal housing 30 by a filler. Both the thermistor 20 and the resistor leads 21 are covered with an insulating layer 22, effectively insulating the two resistor leads 21 from each other and from the thermistor 20 to the inner wall of the metal housing 30. The thermistor 20 can also be called an NTC thermistor.

[0022] In other words, the design of the socket 102 not only allows the resistor lead 21 to connect to the connector 40, but also limits the insertion depth of the resistor lead 21, that is, the depth to which the resistor lead 21 is inserted into the connecting end 11 of the plastic housing 10. This allows for precise control of the welding length between the portion of the resistor lead 21 protruding from the connecting end 11 and the metal housing 30. Figure 3 As shown in α, the thermistor 20 is effectively fixed inside the sensor, making the temperature measurement results of the temperature sensor more stable and ensuring the performance of the temperature sensor.

[0023] The insert 40 is made of copper, which has good electrical conductivity and corrosion resistance.

[0024] In one embodiment, the socket 102 is provided with a semi-circular chamfered opening 1021, which facilitates the smooth installation of the resistor lead 21.

[0025] In one embodiment, the socket 102 further includes a straight portion 1022 and a tapered portion 1023, wherein the tapered portion 1023 connects to the straight portion 1022, and the straight portion 1022 connects to the inner hole of the semi-circular chamfered opening 1021. The diameter of the straight portion 1022 is equal to the diameter of the inner hole and equal to the maximum diameter of the tapered portion 1023. The resistor lead 21 is clearance-fitted with the straight portion 1022, meaning the diameter of the straight portion 1022 is slightly larger than the diameter of the resistor lead 21, primarily serving to… The resistor lead 21 is precisely guided. After passing through the straight portion 1022 and entering the tapered portion 1023, the internal space gradually narrows as the inner diameter of the tapered portion 1023 decreases, gradually clamping and fixing the resistor lead 21. As the resistor lead 21 is fixed, the length of the portion protruding from the connection end 11, that is, the portion that needs to be welded to the metal housing 30, is precisely controlled. The length of the resistor lead 21 inserted into the connection end 11 is determined by the depth of the insertion hole 102 and the slope of the tapered portion 1023. In one embodiment, the angle between the sidewall of the tapered portion 1023 and the central axis of the insertion hole 102 is 1.8 degrees to 2.2 degrees.

[0026] In one embodiment, the insert 40 has a U-shaped clamp 41 connected to or integrally formed on one end protruding from the connecting end 11 near the socket 102. The axis of the U-shaped clamp 41 is parallel to the axis of the socket 102, and the width of the U-shaped clamp 41 is adapted to the diameter of the resistor lead 21. Thus, the U-shaped clamp 41 can both guide the resistor lead 21 and clamp and fix it. It can work with the tapered part 1023 of the socket 102 to double fix the resistor lead 21, forming a double fixing mechanism, thereby further improving the control accuracy of the welding length of the resistor lead 21 and the thermistor 20. In addition, it can prevent the resistor lead 21 from shaking during the welding process, which can significantly reduce the probability of cold solder joints and solder misalignment, improve the consistency and stability of welding quality, and improve the connection reliability and stability of various components such as the insert 40, resistor lead 21, and metal housing 30, thereby extending the service life of the sensor.

[0027] In one embodiment, the portion of the resistor lead 21 located between the U-shaped clamp 41 and the socket 102 is soldered to the insert 40, for example, by soldering or resistance soldering. After soldering, the resistor lead 21 of the NTC thermistor is further fixed by the U-shaped clamp 41.

[0028] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The functions and structural principles of the present invention have been shown and explained in the embodiments, and any modifications or variations may be made to the implementation of the present invention without departing from the stated principles.

Claims

1. A temperature sensor capable of precisely controlling the welding length, characterized in that, The device includes a plastic housing, a thermistor, and a metal housing. The plastic housing has a plastic cavity and a connecting end at one end of the plastic cavity. Two inserts are vertically connected to the connecting end. One end of each insert protrudes from the connecting end and the other end extends into the plastic cavity. The connecting end has a socket near the insert for inserting the resistance lead of the thermistor, allowing the resistance lead to be inserted to a predetermined depth and connected to the insert. The metal housing seals the connecting end, and the thermistor is located at the end of the metal cavity of the metal housing away from the plastic housing, and is fixedly connected to the metal housing by a filler. Both the thermistor and the resistance lead are covered with an insulating layer.

2. The temperature sensor capable of precisely controlling the welding length as described in claim 1, characterized in that, The socket has a semi-circular chamfered opening.

3. The temperature sensor capable of precisely controlling the welding length as described in claim 2, characterized in that, The socket further includes a straight portion and a tapered portion. The tapered portion is connected to the straight portion, and the straight portion is connected to the inner hole of the semi-circular chamfered opening. The diameter of the straight portion is equal to the diameter of the inner hole and equal to the maximum diameter of the tapered portion. The resistor lead is clearance-fitted with the straight portion.

4. The temperature sensor capable of precisely controlling the welding length as described in claim 3, characterized in that, The angle between the sidewall of the tapered portion and the central axis of the insertion hole is 1.8 degrees to 2.2 degrees.

5. The temperature sensor capable of precisely controlling the welding length as described in any one of claims 2 to 4, characterized in that, The insert has a U-shaped clamp connected to or integrally formed with a U-shaped clamp on one end protruding from the connection end, near the socket. The axis of the U-shaped clamp is parallel to the axis of the socket, and the width of the U-shaped clamp is adapted to the diameter of the resistor lead.

6. The temperature sensor capable of precisely controlling the welding length as described in claim 5, characterized in that, The portion of the resistor lead located between the U-shaped clamp and the socket is welded to the insert.

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