Winding type platinum thermistor based on metal framework

Abstract

The utility model discloses a winding type platinum thermal resistor based on a metal framework, which comprises a shell, a winding framework, a platinum wire, an external lead and an armored lead assembly, the winding framework is arranged in the shell, the platinum wire is wound on the winding framework, the winding framework is a metal framework, the armored lead assembly comprises a metal shell, insulating filler and an internal lead, and the external lead is arranged in the metal shell. The two internal leads penetrate through the metal shell and are fixed through insulating filler arranged in the metal shell, the two ends of the platinum wire are connected with the first ends of the two internal leads respectively, and the second ends of the two internal leads are connected with the inner ends of the two external leads respectively. And the metal shell, the second end of the internal lead and the inner end of the external lead are fixed in the shell through sealant. According to the utility model, the winding skeleton made of a metal material is adopted, the strength and the vibration resistance are improved, the processing is convenient, and the armored lead wire assembly is added to connect the platinum wire and the external lead wire, so that the fixing stability and the application reliability of the lead wire are improved.

Description

Technical Field

[0001] This utility model relates to a wire-wound platinum resistance thermometer, and more particularly to a wire-wound platinum resistance thermometer based on a metal frame. Background Technology

[0002] Platinum resistance thermometers, also known as platinum resistance thermometers, have resistance values ​​that change with temperature. They are suitable for high-precision temperature equipment in medical, motor, industrial, temperature calculation, satellite, meteorological, and resistance calculation applications.

[0003] Platinum resistance thermometers are mainly of the wire-wound type, such as mica-framed wire-wound platinum resistance thermometers, glass-framed wire-wound platinum resistance thermometers, and ceramic-framed wire-wound platinum resistance thermometers. The basic structure of a wire-wound platinum resistance thermometer includes a shell, a wire frame, platinum wire, and leads. The wire frame is placed inside the shell, the platinum wire is wound on the wire frame and connected to the leads, and the outer end of the leads is outside the shell for connection to the power supply.

[0004] Traditional wire-wound platinum resistance thermometers use non-metallic materials for their winding frames, resulting in low strength and poor vibration resistance. Furthermore, the manufacturing process is complex, time-consuming, and costly. Additionally, the lead wire connection typically involves direct connection of platinum wire to external leads, which can lead to insecure lead wire fixation and potential short circuits. Moreover, the housing generally lacks a mounting structure, requiring additional mounting components and making it inconvenient to use. Utility Model Content

[0005] The purpose of this invention is to provide a high-strength, securely fixed external lead wire-based wire-wound platinum resistance thermometer to solve the above problems.

[0006] This utility model achieves the above objectives through the following technical solutions:

[0007] A wire-wound platinum resistance thermometer based on a metal frame includes a housing, a wire-wound frame, platinum wire, and external leads. The wire-wound frame is placed inside the housing, and the platinum wire is wound on the wire-wound frame and connected to the external leads. The wire-wound platinum resistance thermometer based on a metal frame also includes an armored lead assembly. The wire-wound frame is a metal frame, and mica paper is respectively provided between the platinum wire and the outer wall of the wire-wound frame, and between the platinum wire and the inner wall of the housing. The armored lead assembly includes a metal shell, insulating filler, and internal leads. Two internal leads pass through the metal shell and are fixed by the insulating filler disposed inside the metal shell. The two ends of the platinum wire are respectively connected to the first ends of the two internal leads, and the second ends of the two internal leads are respectively connected to the inner ends of the two external leads. The metal shell, the second ends of the internal leads, and the inner ends of the external leads are all fixed inside the housing with sealant.

[0008] Preferably, in order to better position the winding skeleton to further improve vibration resistance and facilitate the installation of the armored lead assembly, the two ends of the winding skeleton are respectively provided with a first convex ring and a second convex ring protruding outward in the circumferential direction. The outer circumferential wall of the first convex ring and the outer circumferential wall of the second convex ring are in close contact with the inner circumferential wall of the outer shell. One end of the winding skeleton is provided with an oblique through hole, one end of which passes through the end face of the second convex ring and the other end passes through the surface of the outer wall of the winding skeleton near the second convex ring. The metal shell of the armored lead assembly passes through the oblique through hole.

[0009] Preferably, to facilitate the installation of this platinum resistance thermometer, one end of the housing is provided with a mounting component, which is a mounting protrusion ring, an external threaded ring, or a mounting ear with a mounting through hole.

[0010] Preferably, to further improve strength, the outer shell is made of stainless steel, and the winding frame is made of stainless steel with its surface plated with nickel.

[0011] Preferably, to ensure insulation and sealing performance, both the insulating filler and the sealant are epoxy resins.

[0012] The beneficial effects of this utility model are as follows:

[0013] This invention uses a metal winding skeleton, which improves strength and vibration resistance and facilitates processing. By adding an armored lead assembly to connect the platinum wire and the external lead, the stability of the lead fixing and the reliability of application are improved. By designing convex rings at both ends of the winding skeleton, reliable positioning of the winding skeleton is achieved, further improving vibration resistance. By designing mounting parts on the outer shell, it is easy to install and apply directly. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main cross-sectional structure of the wire-wound platinum resistance thermometer based on a metal frame according to this utility model;

[0015] Figure 2 This is a three-dimensional structural diagram of the winding skeleton of the wire-wound platinum resistance thermometer based on a metal skeleton according to this utility model.

[0016] Figure 3 This is one of the three-dimensional structural schematic diagrams of the outer shell of the wire-wound platinum resistance thermometer based on a metal frame according to this utility model;

[0017] Figure 4 This is the second three-dimensional structural schematic diagram of the outer shell of the wire-wound platinum resistance thermometer based on a metal frame as described in this utility model.

[0018] Figure 5This is the third three-dimensional structural diagram of the outer shell of the wire-wound platinum resistance thermometer based on a metal frame described in this utility model. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings:

[0020] like Figures 1-5 As shown, the wire-wound platinum resistance thermometer based on a metal frame of this invention includes a shell 3, a wire-wound frame 2, a platinum wire 4, an external lead 11, and an armored lead assembly. The wire-wound frame 2 is placed inside the shell 3. The platinum wire 4 is wound on the wire-wound frame 2 and connected to the external lead 11. The wire-wound frame 2 is a metal frame. Mica paper (not shown in the figure) for insulation is provided between the platinum wire 4 and the outer wall of the wire-wound frame 2, and between the platinum wire 4 and the inner wall of the shell 3. The armored lead assembly includes a metal shell 8, an insulating filler 6, and internal leads 5. Two internal leads 5 pass through the metal shell 8 and are fixed by the insulating filler 6 provided inside the metal shell 8. The two ends of the platinum wire 4 are respectively connected to the first end of the two internal leads 5, and the second end of the two internal leads 5 are respectively connected to the inner end of the two external leads 11. The metal shell 8, the second end of the internal leads 5, and the inner end of the external leads 11 are all fixed inside the shell 3 by sealant 9.

[0021] like Figures 1-5 As shown, this utility model also discloses the following more optimized specific structures:

[0022] To better position the winding frame 2 to further improve its vibration resistance and facilitate the installation of the armored lead assembly, the winding frame 2 has a first protruding ring 1 and a second protruding ring 7 protruding outwards at both ends. The outer circumferential wall of the first protruding ring 1 and the outer circumferential wall of the second protruding ring 7 are in close contact with the inner circumferential wall of the outer shell 3. One end of the winding frame 2 has an oblique through hole 12, one end of which passes through the end face of the second protruding ring 7 and the other end passes through the surface of the outer wall of the winding frame 2 near the second protruding ring 7. The metal shell 8 of the armored lead assembly passes through the oblique through hole 12.

[0023] To facilitate the installation of this platinum resistance thermometer, one end of the housing 3 is provided with a mounting component, which is a mounting ring 10 (see...). Figure 1 and Figure 3 (for laser welding installation), external threaded ring 13 (see...) Figure 4 (for threaded connection installation) or mounting lug 15 with mounting through hole 14 (see Figure 5 (For screw mounting).

[0024] To further enhance strength, the outer shell 3 is made of stainless steel, and the winding frame 2 is made of stainless steel with its surface plated with nickel.

[0025] To ensure insulation and sealing performance, both the insulating filler 6 and the sealant 9 are epoxy resins.

[0026] like Figures 1-5 As shown, during manufacturing, a stainless steel winding frame 2 and outer shell 3 are first machined. Nickel is plated onto the surface of the winding frame 2. The specific mounting parts of the outer shell 3 are manufactured according to actual needs. An armored lead assembly, including a metal shell 8, insulating filler 6, and internal lead wires 5, is then manufactured. The metal shell 8 of the armored lead assembly is passed through the oblique through-hole 12 of the winding frame 2 and fixed to the winding frame 2 by brazing. A folded platinum wire 4 is wound around the outside of the winding frame 2 after it is covered with mica paper. Specifically, inorganic instant adhesive is first applied to the fold point and then to the winding frame 2. The platinum wire 4 is fixed near the first convex ring 1, and then wound towards the second convex ring 7. After winding, the two ends of the platinum wire 4 are brazed to the first ends of the two internal leads 5 respectively. Then, the second ends of the two internal leads 5 are brazed to the inner ends of the two external leads 11 respectively. A layer of mica paper is covered on the surface of the platinum wire 4 for insulation. Then, the wires are put into the outer shell 3. The metal shell 8, the second ends of the internal leads 5 and the inner ends of the external leads 11 are all fixed in the outer shell 3 with sealant 9. This completes the fabrication of the entire wound platinum resistance thermometer.

[0027] like Figures 1-5 As shown, when in use, the external lead 11 is connected to the power supply. Since the resistance of the platinum wire 4 changes with temperature, the corresponding temperature change information can be obtained by detecting the current in the circuit where the platinum wire 4 is located, thereby achieving the purpose of temperature detection. It is generally used as a temperature sensor.

[0028] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.

Claims

1. A wire-wound platinum thermal resistor based on a metal skeleton, comprising a housing, a winding skeleton, a platinum wire and an external lead, wherein the winding skeleton is placed in the housing, the platinum wire is wound on the winding skeleton and connected to the external lead, characterized in that: The metal skeleton-based wound platinum thermal resistor also includes an armored lead assembly, the winding skeleton is a metal skeleton, mica paper is respectively provided between the platinum wire and the outer wall of the winding skeleton, and between the platinum wire and the inner wall of the shell, the armored lead assembly includes a metal shell, an insulating filler and an internal lead, the two internal leads pass through the metal shell and are fixed by the insulating filler provided in the metal shell, the two ends of the platinum wire are respectively connected to the first ends of the two internal leads, the second ends of the two internal leads are respectively connected to the inner ends of the two external leads, and the metal shell, the second end of the internal lead and the inner end of the external lead are all fixed in the shell by sealant.

2. The metal skeleton-based wire-wound platinum thermal resistor according to claim 1, characterized in that: The two ends of the winding skeleton are respectively provided with a first convex ring and a second convex ring protruding toward the outer circumferential direction, the circumferential outer wall of the first convex ring and the circumferential outer wall of the second convex ring are respectively in close contact with the circumferential inner wall of the outer shell, one end of the winding skeleton is provided with an oblique through hole and one end of the oblique through hole passes through the end face of the second convex ring, and the other end passes through the surface of the outer wall of the winding skeleton close to the second convex ring, and the metal shell of the armored lead assembly passes through the oblique through hole.

3. The metal skeleton-based wire-wound platinum thermal resistor according to claim 1 or 2, characterized in that: One end of the shell is provided with a mounting piece, and the mounting piece is a mounting convex ring, an external threaded ring or a mounting ear provided with a mounting through hole.

4. The metal skeleton-based wire-wound platinum thermal resistor according to claim 1 or 2, characterized in that: The shell is a stainless steel shell, and the winding frame is a stainless steel frame with a surface plated with nickel.

5. The metal skeleton-based wire-wound platinum thermal resistor according to claim 1 or 2, characterized in that: The insulating filler and the sealant are both epoxy resins.

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