Shell-packaged NTC (Negative Temperature Coefficient) temperature sensor
By using a package shell and elastic thermally conductive material in the NTC temperature sensor, the problem of package layer damage caused by lead wire bending was solved, and the integrity of the package layer and the thermal conductivity performance were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-10
- Publication Date
- 2026-04-14
AI Technical Summary
When radial NTC thermistors are installed, bending of the lead wires can cause stress concentration at the connection between the lead wires and the encapsulation layer, leading to cracking of the encapsulation layer or damage to its airtightness, thus affecting performance.
The NTC body is encapsulated in the placement hole using a package shell. The lead wire and the package material form the package connection end. The filling hole is filled with elastic thermally conductive material to form a spherical cap, which abuts against the device under test to ensure the integrity of the package layer and shock resistance.
To prevent damage to the encapsulation layer when the lead wire is bent, maintain the integrity of the encapsulation layer, and improve heat conduction efficiency and shock resistance through elastic thermally conductive materials.
Smart Images
Figure CN224122066U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of instrumentation technology, specifically relating to a shell-encapsulated NTC temperature sensor. Background Technology
[0002] The radial NTC thermistor is a thermistor product with a head size of 1.0mm~2.5mm and a resistance range of 0.5kΩ~1000kΩ. It features small size and stable and reliable performance, and can be used for temperature control and temperature detection in household appliances such as induction cookers, electric pressure cookers, rice cookers, electric ovens, sterilizers, microwave ovens, and electric heaters.
[0003] However, during installation, the bending of the leads of radial NTC thermistors can cause stress concentration at the connection between the leads and the encapsulation layer, leading to cracks or gaps in the encapsulation layer. This damages the airtightness of the encapsulation layer, allowing external moisture or corrosive gases to seep in and affecting the performance of the NTC thermistor. Utility Model Content
[0004] Purpose of the utility model: To provide a housing-encapsulated NTC temperature sensor, which solves the above-mentioned problems existing in the prior art.
[0005] Technical Solution: A housing-encapsulated NTC temperature sensor includes an NTC body and two sets of leads. The edge of the NTC body forms a body connection end with the leads. The sensor also includes an enclosure. One end of the enclosure has a placement hole. The NTC body is encapsulated within the placement hole by an encapsulating material. The leads extend along the axial direction of the placement hole to the outside of the hole. The leads and the end of the encapsulating material form an encapsulation connection end. A gap is formed between the encapsulation connection end and the body connection end. The other end of the enclosure has a filling hole. A separation layer is formed between the filling hole and the placement hole. The filling hole is filled with an elastic thermally conductive material. The elastic material forms a spherical cap at the opening of the filling hole, and the spherical cap abuts against the device under test.
[0006] Preferably, the encapsulation shell is a cylinder or a cylinder with a skirt at one end.
[0007] Preferably, the encapsulation shell is made of ceramic material, metal material, or injection molded part.
[0008] Preferably, the encapsulation shell and the NTC body are encapsulated with adhesive or cured.
[0009] Preferably, the NTC body includes a resistor chip, the leads are disposed on both sides of the resistor chip, the resistor chip is encapsulated with an encapsulation layer, and the edge of the encapsulation layer forms a body connection terminal with the leads.
[0010] Beneficial effects: This utility model relates to a shell-encapsulated NTC temperature sensor. The NTC body is encapsulated in the shell using encapsulation material, so that the lead wire and the encapsulation material form an encapsulation connection end. A gap is formed between the encapsulation connection end and the body connection end. When the temperature sensor is installed, even if the lead wire is bent, it will only stop at the encapsulation connection end, avoiding damage to the encapsulation layer due to the bending of the lead wire, thus ensuring the integrity of the encapsulation layer.
[0011] Secondly, the filling hole on the top surface of the packaging shell is filled with elastic thermally conductive material, which can ensure heat conduction. At the same time, the spherical crown formed by the elastic thermally conductive material abuts against the device under test, which not only enhances the tightness of the fit, but also uses the spherical crown to resist shock, so as to achieve shock-resistant heat conduction during installation. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the overall design of the present invention with a skirt. Figure 1 ;
[0013] Figure 2 This is a cross-sectional view of the skirted glass sealing layer of this utility model;
[0014] Figure 3 This is a cross-sectional view of the skirted encapsulation shell of this utility model;
[0015] Figure 4 This is a schematic diagram of the cylindrical version of this utility model;
[0016] Figure 5 This is a cross-sectional view of the cylindrical version of this utility model;
[0017] Figure 6 This is a cross-sectional view of the epoxy resin sealing layer with a skirt according to this utility model;
[0018] Figure 7 This is a cross-sectional view of the plastic sealing layer with a skirt according to this utility model.
[0019] Figures 1 to 7 The reference numerals in the attached diagram are: 1. NTC body; 2. Lead wire; 3. Package shell; 4. Placement hole; 5. Filling hole; 6. Crown. Detailed Implementation
[0020] Example 1
[0021] like Figures 1 to 7 As shown, this utility model provides a technical solution: a shell-encapsulated NTC temperature sensor, including an NTC body 1 and two sets of leads 2. The NTC body 1 includes a resistor chip, and the leads 2 are mounted on both sides of the resistor chip. The resistor chip is externally encapsulated with an encapsulation layer, which can be a glass encapsulation layer, an epoxy resin encapsulation layer, or other encapsulation layers, such as... Figure 2 , Figure 6 and Figure 7 As shown, the edge of the encapsulation layer forms a body connection end with the lead wire 2, and also includes an encapsulation shell 3. One end of the encapsulation shell 3 has a placement hole 4. The NTC body 1 is encapsulated in the placement hole 4 by encapsulation material. The lead wire 2 extends along the axial direction of the placement hole 4 to the outside of the placement hole 4. The lead wire 2 and the end of the encapsulation material form an encapsulation connection end. When installing the temperature sensor, even if the lead wire 2 is bent, it will only stop at the encapsulation connection end, avoiding damage to the encapsulation layer due to bending of the lead wire 2, thus ensuring the integrity of the encapsulation layer. A gap is formed between the encapsulation connection end and the body connection end. The other end of the encapsulation shell 3 is provided with a filling hole 5. A separation layer is formed between the filling hole 5 and the placement hole 4. The filling hole 5 is filled with an elastic thermally conductive material. The elastic material forms a spherical crown 6 at the opening of the filling hole 5. The spherical crown 6 abuts against the device under test. That is, when the NTC temperature sensor is installed on the device under test, the spherical crown 6 fits against the device under test, which plays a role in shock resistance during installation or use. Moreover, the good thermal conductivity of the elastic thermally conductive material is used to improve the thermal conductivity efficiency. Even if the encapsulation shell 3 is sleeved on the outside of the NTC body 1, the NTC body 1 still maintains accurate detection.
[0022] Among them, such as Figure 5 As shown, the encapsulation shell 3 is cylindrical. When the NTC temperature sensor needs to be installed in a location with limited space, a cylindrical encapsulation shell 3 is used. Depending on the application scenario, the encapsulation shell 3 can be made of ceramic material, metal material, or injection molded part. The encapsulation shell 3 and the NTC body 1 can be encapsulated with glue to separate the NTC body 1 into the placement hole 4 of the encapsulation shell 3, or they can be encapsulated with curing to separate the NTC body 1 into the placement hole 4 of the encapsulation shell 3. The material selection of the encapsulation shell 3 depends on the application scenario. When the NTC temperature sensor needs to make a fast response, a metal encapsulation shell 3 is used. When high insulation and voltage resistance are required, an injection molded encapsulation shell 3 is used. When both high insulation and voltage resistance and high temperature resistance are required, a ceramic encapsulation shell 3 is used.
[0023] Example 2
[0024] In this embodiment, as Figure 2 and Figure 3As shown, the encapsulation shell 3 is a cylinder with a skirt at one end, that is, it includes a cylindrical shell and a skirt fitted onto one end of the cylindrical shell. When there is enough space for the NTC temperature sensor to be installed, a cylinder with a skirt is used. By installing the NTC temperature sensor with a cylinder with a skirt, the NTC temperature sensor can be installed more stably. Depending on the different usage scenarios, the encapsulation shell 3 can be made of ceramic material, metal material or injection molded part. The material selection of the encapsulation shell 3 is the same as the selection conditions in Embodiment 1. The encapsulation shell 3 and the NTC body 1 can be separated into the placement hole 4 of the encapsulation shell 3 by adhesive encapsulation or by curing encapsulation.
[0025] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.
Claims
1. A housing-encapsulated NTC temperature sensor, comprising an NTC body (1) and two sets of leads (2), wherein the edge of the NTC body (1) forms a body connection end with the leads (2), characterized in that, It also includes a packaging shell (3), one end of which is provided with a placement hole (4). The NTC body (1) is encapsulated in the placement hole (4) by a packaging material. The lead wire (2) extends along the axial direction of the placement hole (4) to the outside of the placement hole (4). The lead wire (2) and the end of the packaging material form a packaging connection end. A gap is formed between the packaging connection end and the body connection end. The other end of the packaging shell (3) is provided with a filling hole (5). A separation layer is formed between the filling hole (5) and the placement hole (4). The filling hole (5) is filled with an elastic thermally conductive material. The elastic material forms a spherical crown (6) at the opening of the filling hole (5). The spherical crown (6) abuts against the device to be tested.
2. The NTC temperature sensor with a housing package according to claim 1, characterized in that, The encapsulation shell (3) is a cylinder or a cylinder with a skirt at one end.
3. The housing-encapsulated NTC temperature sensor according to claim 2, characterized in that, The encapsulation shell (3) is made of ceramic material, metal material or injection molded part.
4. The housing-encapsulated NTC temperature sensor according to claim 2, characterized in that, The encapsulation shell (3) and the NTC body (1) are encapsulated with glue or cured.
5. A housing-encapsulated NTC temperature sensor according to any one of claims 1-4, characterized in that, The NTC body (1) includes a resistor chip, and the leads (2) are disposed on both sides of the resistor chip. The resistor chip is encapsulated with an encapsulation layer, and the edge of the encapsulation layer forms a body connection end with the leads (2).