NTC (Negative Temperature Coefficient) temperature sensor of packaging-free structure

Abstract

The NTC temperature sensor comprises a housing, a connector and a thermistor, the housing is provided with a mounting groove, the thermistor is arranged in the mounting groove, the connector is embedded in an opening of the mounting groove, the connector is provided with a positive terminal and a negative terminal, and the negative terminal is embedded in the mounting groove. And the positive terminal and the negative terminal are connected with two poles of the thermistor through the flexible carrier. The sensor is suitable for a clothes dryer and other working scenes where heat is transmitted through hot air, packaging and sealing are not needed, an injection molding shell structure is adopted, the thermistor and the terminal are connected through the flexible carrier, the preparation technology is simple, installation is convenient, and the preparation cost of the sensor can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to an NTC temperature sensor with a packaging-free structure. Background Art

[0002] The working principle of NTC temperature sensor is mainly based on the thermal effect of NTC thermistor. The resistance value decreases rapidly as the temperature rises, and increases as the temperature decreases. Using this characteristic, the corresponding temperature can be determined by measuring the resistance value of NTC thermistor, thereby achieving the purpose of detecting temperature.

[0003] During the preparation process, the existing NTC temperature sensors generally need to be packaged, that is, the resistor is encapsulated with epoxy resin glue, and then the product is potted with epoxy resin glue. The resin encapsulation process is complicated, and the resin-encapsulated sensor is generally suitable for working environments that need to contact with liquids and other media. To this end, the present application proposes an NTC temperature sensor with a package-free structure, which replaces the packaging structure of the sensor in working scenarios where contact with liquids is not required. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an NTC temperature sensor with a packaging-free structure in view of the above shortcomings.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] An NTC temperature sensor with a package-free structure comprises a shell, a connector and a thermistor, wherein the shell is provided with a mounting groove, the thermistor is arranged in the mounting groove, the connector is embedded in the opening of the mounting groove, the connector is provided with a positive terminal and a negative terminal, and the positive terminal and the negative terminal are connected to two stages of the thermistor through a flexible carrier.

[0007] Furthermore, the flexible carrier includes an elastic member and a first lead, the positive and negative electrodes of the thermistor both extend out of the first lead, one end of the elastic member is connected to the first lead, and the other end is connected to the positive terminal or the negative terminal, and the elastic member is a conductor.

[0008] Furthermore, at least two limiting grooves are arranged in the installation groove, the elastic member is arranged in the limiting groove, and the first lead wire extends into the limiting groove.

[0009] Furthermore, the elastic member is a spring.

[0010] Furthermore, the flexible carrier includes a second lead, the positive electrode and the negative electrode of the thermistor both extend out of the second lead, one end of the second lead away from the thermistor is connected to the positive terminal or the negative terminal, and the second lead is wavy.

[0011] Furthermore, a first guiding structure is provided on the connector, and a second guiding structure is provided on the housing, and the first guiding structure and the second guiding structure cooperate with each other.

[0012] Furthermore, the connector is interference fit with the mounting groove.

[0013] Furthermore, a limiting ring is arranged at the opening.

[0014] Compared with the prior art, the utility model has the following advantages after adopting the above technical solution:

[0015] The utility model is suitable for working scenes such as clothes dryers that rely on hot air to transfer heat, so there is no need for packaging and sealing, and an injection molded shell structure is adopted, and a flexible carrier is used to connect the thermistor and the terminal. The preparation process is simple and the installation is convenient, which can reduce the preparation cost of the sensor.

[0016] The utility model adopts an injection-molded shell structure, and increases the size of the temperature sensing area without affecting the installation, so as to obtain a thermal response speed that matches the resin-encapsulated sensor.

[0017] The utility model is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an exploded view of the first embodiment of the present utility model;

[0019] Figure 2 This is a front view of the first embodiment of the utility model;

[0020] Figure 3 for Figure 2 AA section view;

[0021] Figure 4 for Figure 2 BB cross-section diagram;

[0022] Figure 5 This is an exploded view of the second embodiment of the present utility model;

[0023] Figure 6 This is a front view of the second embodiment of the utility model;

[0024] Figure 7 for Figure 6 AA section view;

[0025] Figure 8 for Figure 6 BB cross-section diagram.

[0026] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0027] 1. Shell; 11. Mounting groove; 12. Opening; 13. Limiting groove; 14. Second guide structure; 15. Limiting ring; 2. Connector; 21. First guide structure; 3. Thermistor; 4. Positive terminal; 5. Negative terminal; A. Flexible carrier; A1. Elastic member; A2. First lead wire; A3. Second lead wire. DETAILED DESCRIPTION

[0028] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise" and "counterclockwise" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0030] An NTC temperature sensor with a package-free structure comprises a housing 1, a connector 2 and a thermistor 3. The housing 1 is provided with a mounting groove 11, the thermistor 3 is arranged in the mounting groove 11, the connector 2 is embedded in an opening 12 of the mounting groove 11, the connector 2 is provided with a positive terminal 4 and a negative terminal 5, and the positive terminal 4 and the negative terminal 5 are connected to two poles of the thermistor 3 through a flexible carrier A.

[0031] In this embodiment, the sensor is mainly used in working scenarios such as clothes dryers that rely on hot air to transfer heat. It does not need to contact with media such as liquids, so there is no need to use a resin packaging process;

[0032] An injection molded housing structure is adopted, and the thermistor is connected to the terminal through a flexible carrier. The flexible carrier is a conductor and can be compressed to a certain extent.

[0033] Embodiment 1:

[0034] like Figures 1 to 4 As shown, it includes a housing 1, a connector 2 and a thermistor 3;

[0035] The rear end of the housing 1 is provided with a mounting groove 11, and the rear side of the mounting groove 11 is provided with an opening 12, the thermistor 3 is arranged in the mounting groove 11 and is located at the front side of the mounting groove 11, the connector 2 is embedded in the opening 12, and the connector 2 is provided with a positive terminal 4 and a negative terminal 5;

[0036] A first lead A2 extends from both sides of the thermistor 3, and an elastic member A1 is provided between the first lead A2 and the positive terminal 4 / negative terminal 5, and the elastic member A1 is a spring, and the two ends of the spring are respectively connected to the first lead A2 and the positive terminal 4 / negative terminal 5; when the connector 2 is installed on the housing 1, the spring will be compressed so that the two ends of the spring are pressed on the first lead A2 and the positive terminal 4 / negative terminal 5, so that the two poles of the thermistor 3 are connected to the positive terminal 4 and the negative terminal 5.

[0037] The mounting groove 11 is provided with two limiting grooves 13, which are cylindrical in shape and have a strip opening on the side wall thereof. The two limiting grooves 13 are located on both sides of the thermistor 3, and the first leads A2 on both sides of the thermistor 13 extend into the limiting grooves 13 through the strip openings, and the elastic member A1 is located in the limiting grooves 13. The limiting grooves 13 are used to limit the position of the elastic member A1 so that the elastic member A1 is always maintained between the first lead A2 and the positive terminal 4 / negative terminal 5.

[0038] Preferably, a second guide structure 14 is provided on the inner side of the mounting groove 11, and a first guide structure 21 is provided on the outer side of the connector 2. The first guide structure 21 and the second guide structure 14 are used to identify the alignment position of the housing 1 and the connector 2; when the connector 2 is embedded in the opening 12, the first guide structure 21 and the second guide structure 14 are used to limit the relative translation direction of the connector 2 and the housing 1;

[0039] The connector 2 and the inner wall of the mounting groove 11 are fitted in an interference fit;

[0040] A circle of limiting ring 15 is provided on the rear side of the opening 12. When the connector 2 is fully embedded in the opening 12, the limiting ring 15 prevents the connector 2 from escaping from the opening 12. To this end, when the connector 2 is embedded in the opening 12, the limiting ring 15 can undergo elastic deformation to a certain extent so that the connector 2 can be smoothly embedded in the opening 12.

[0041] Embodiment 2:

[0042] like Figures 5 to 8 As shown, it includes a housing 1, a connector 2 and a thermistor 3;

[0043] The rear end of the housing 1 is provided with a mounting groove 11, and the rear side of the mounting groove 11 is provided with an opening 12, the thermistor 3 is arranged in the mounting groove 11 and is located at the front side of the mounting groove 11, the connector 2 is embedded in the opening 12, and the connector 2 is provided with a positive terminal 4 and a negative terminal 5;

[0044] A second lead A3 extends from both sides of the thermistor 3, and the other end of the second lead A3 is bent backward and connected to the positive terminal 4 / negative terminal 5. The middle part of the second lead A3 is wavy and can be compressed. When the connector 2 is installed on the housing 1, the second lead A3 will be compressed so that the other end of the second lead A3 is pressed on the positive terminal 4 / negative terminal 5, so that the two poles of the thermistor 3 are connected to the positive terminal 4 and the negative terminal 5.

[0045] Preferably, a second guide structure 14 is provided on the inner side of the mounting groove 11, and a first guide structure 21 is provided on the outer side of the connector 2. The first guide structure 21 and the second guide structure 14 are used to identify the alignment position of the housing 1 and the connector 2; when the connector 2 is embedded in the opening 12, the first guide structure 21 and the second guide structure 14 are used to limit the relative translation direction of the connector 2 and the housing 1;

[0046] The connector 2 and the inner wall of the mounting groove 11 are fitted in an interference fit manner, and a strip-shaped protrusion extending in the front-to-back direction is provided on the outer wall of the connector 2 .

[0047] The above is an example of the best implementation of the utility model, and the parts not described in detail are common knowledge of ordinary technicians in this field. The protection scope of the utility model is based on the content of the claims, and any equivalent transformation based on the technical inspiration of the utility model is also within the protection scope of the utility model.

Claims

1. An NTC temperature sensor with a package-free structure, characterized in that: The invention comprises a housing (1), a connector (2) and a thermistor (3); the housing (1) is provided with a mounting groove (11); the thermistor (3) is arranged in the mounting groove (11); the connector (2) is embedded in an opening (12) of the mounting groove (11); the connector (2) is provided with a positive terminal (4) and a negative terminal (5); the positive terminal (4) and the negative terminal (5) are connected to two poles of the thermistor (3) via a flexible carrier (A).

2. The NTC temperature sensor with a package-free structure according to claim 1, characterized in that: The flexible carrier (A) comprises an elastic member (A1) and a first lead (A2), the positive electrode and the negative electrode of the thermistor (3) both extend from the first lead (A2), one end of the elastic member (A1) is connected to the first lead (A2), and the other end is connected to the positive terminal (4) or the negative terminal (5), and the elastic member (A1) is a conductor.

3. The NTC temperature sensor with a package-free structure according to claim 2, characterized in that: At least two limiting grooves (13) are arranged in the installation groove (11), the elastic member (A1) is arranged in the limiting groove (13), and the first lead wire (A2) extends into the limiting groove (13).

4. The NTC temperature sensor with a package-free structure according to claim 2, characterized in that: The elastic member (A1) is a spring.

5. The NTC temperature sensor with a package-free structure according to claim 1, characterized in that: The flexible carrier (A) comprises a second lead (A3), the positive electrode and the negative electrode of the thermistor (3) both extend from the second lead (A3), one end of the second lead (A3) away from the thermistor (3) is connected to the positive terminal (4) or the negative terminal (5), and the second lead (A3) is wavy.

6. The NTC temperature sensor with a package-free structure according to claim 1, characterized in that: The connector (2) is provided with a first guide structure (21), and the housing (1) is provided with a second guide structure (14), and the first guide structure (21) and the second guide structure (14) cooperate with each other.

7. The NTC temperature sensor with a package-free structure according to claim 1, characterized in that: The connector (2) is interference fit with the mounting groove (11).

8. The NTC temperature sensor with a package-free structure according to claim 1, characterized in that: A limiting ring (15) is arranged at the opening (12).

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