Snap ring mounted automotive coolant NTC temperature sensor

Abstract

This utility model discloses a spring-loaded NTC temperature sensor for automotive coolant, relating to the field of sensor technology. It includes a brass housing, a connector plastic shell mounted on the top of the brass housing, a terminal mounted on the bottom of the connector plastic shell, a thermally conductive material injected into the inner wall of the bottom of the brass housing, an NTC thermistor connected inside the thermally conductive material, an encapsulation material covering the outer wall of the NTC thermistor, a connection between the top of the NTC thermistor and the bottom of the terminal, and a washer mounted on the top of the brass housing. In this utility model, the resistance leads, solder joints, and terminals are encapsulated to protect the strength of the resistance leads while meeting insulation, pressure resistance, moisture-proof, and waterproof requirements. The brass housing is very thin, and the bottom is filled with thermally conductive material, ensuring the sensor has a sensitive and fast response time, improving the safety and reliability of the coolant piping system.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, specifically a snap ring mounted automotive coolant NTC temperature sensor. Background Technology

[0002] The global temperature sensor market is projected to grow from $6.3 billion in 2020 to $8.8 billion in 2027, representing a CAGR of 4.8%. This growth in recent years has been primarily driven by increasing demand for temperature sensors in the automotive sector. Rapid industrialization across the Asia-Pacific region has created a favorable environment for the market's growth, particularly the expanding automotive and industrial manufacturing sectors, which have generated significant demand. While China's sensor industry has seen rapid technological development, it still lags far behind the United States, Japan, and Germany. Furthermore, my country's large sensor demand, especially for high-end products, necessitates heavy reliance on imports, resulting in a significant gap in domestic manufacturing.

[0003] In existing technologies, traditional resistor leads, solder joints, and terminals may lack effective protection and are easily damaged by the external environment, such as moisture and corrosion, which can lead to changes in resistance values ​​and affect measurement accuracy. Furthermore, traditional sensors have slow thermal response speeds and cannot reflect temperature changes of the measured object in a timely manner. Utility Model Content

[0004] The purpose of this invention is to provide a snap ring mounted automotive coolant NTC temperature sensor to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides a snap-fit ​​type automotive coolant NTC temperature sensor, including a brass housing, a connector plastic shell mounted on the top of the brass housing, a terminal mounted on the bottom of the connector plastic shell, a thermally conductive material injected into the inner wall of the bottom of the brass housing, an NTC thermistor connected inside the thermally conductive material, an encapsulation material sleeved on the outer wall of the NTC thermistor, the top of the NTC thermistor connected to the bottom of the terminal, a washer mounted on the top of the brass housing, an outer sealing ring mounted on the bottom of the brass housing, and a mounting shell sleeved on the outside of the brass housing.

[0006] Furthermore, the outer sealing ring is made of rubber, and the encapsulation material has good thermal conductivity, adhesion, and insulation properties.

[0007] Furthermore, the NTC thermistor is made of composite ceramic material, the terminals and the NTC thermistor are encapsulated by encapsulation material, and the gasket is sealed to the opposite end of the connector plastic shell by riveting the brass shell. The gasket is made of elastic material.

[0008] Furthermore, the thermally conductive material is in the form of a paste. The thermally conductive material is connected to the inner wall of the brass casing at the bottom, and the inner wall of the thermally conductive material near the top is plugged into the bottom of the NTC thermistor.

[0009] Furthermore, an abutment block is installed on one side of the outer wall of the brass casing. The abutment block is in contact with the buckle assembly. The buckle assembly includes a fixing block installed on the outer wall of the casing. A button is slidably connected to the inner wall of the fixing block. A slide rod is slidably connected to the middle of the fixing block. An irregularly shaped slide block is slidably connected to the inner wall of the slide rod. A spring is installed at the top of the slide rod. A stop block is connected to the bottom of the slide rod.

[0010] Furthermore, one outer wall of the fixed block is fixedly connected to the outer wall of the mounting housing, and both sides of the inner wall of the button are equipped with inclined protrusions, which are respectively connected to the outer walls of the two sides of the irregular sliding block.

[0011] Furthermore, the bottom end of the spring is fixedly connected to the top end of the slide rod, and the top end of the spring is fixedly connected to the inner top wall of the button.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. The resistor leads, solder joints, and terminals are encapsulated to protect the strength of the resistor leads and meet the requirements for insulation, pressure resistance, moisture and water resistance. The bottom of the brass housing is filled with thermally conductive material to ensure that the sensor has a sensitive and fast response time, improving the safety and reliability of the coolant piping system. The NTC thermistor is encapsulated through a specific process to make a temperature sensor, which is installed on the equipment to dynamically feed back the coolant piping temperature and provide real-time temperature status feedback to the control unit, enabling precise control of the coordinated operation of related components such as the water pump, radiator, and throttle valve.

[0014] 2. The snap-fit ​​assembly, through its contact limit design, ensures the stability and reliability of the sensor in a fixed state, reducing problems caused by unstable fixing. Furthermore, the sensor can be quickly disassembled and installed by pressing the button or contacting the stop block. Attached Figure Description

[0015] Figure 1 A schematic diagram of the overall structure of a snap-fit ​​type automotive coolant NTC temperature sensor;

[0016] Figure 2 A schematic diagram of the internal structure of a snap-fit ​​type automotive coolant NTC temperature sensor.

[0017] Figure 3 A schematic diagram of the housing in a snap-fit ​​type automotive coolant NTC temperature sensor;

[0018] Figure 4 A schematic diagram of the bottom structure of the housing in a snap-fit ​​type automotive coolant NTC temperature sensor;

[0019] Figure 5 A schematic diagram of the internal structure of the snap-fit ​​assembly in a snap-fit ​​type automotive coolant NTC temperature sensor.

[0020] Figure 6 This is a schematic diagram of the internal structure of the housing in a snap-fit ​​type automotive coolant NTC temperature sensor.

[0021] In the picture:

[0022] 1. Connector plastic housing; 2. Terminal; 3. NTC thermistor; 4. Washer; 5. Brass housing; 6. Outer sealing ring; 7. Encapsulation material; 8. Thermally conductive material; 9. Mounting housing; 10. Fixing block; 11. Button; 12. Slide bar; 13. Irregularly shaped sliding block; 14. Spring; 15. Stop block; 16. Abutting block. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1 - Figure 6 This utility model provides a technical solution for a snap ring mounted automotive coolant NTC temperature sensor:

[0025] In the embodiments of this utility model, see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6The assembly includes a brass housing 5, which serves as the main component. A connector plastic shell 1 is mounted on the top of the brass housing 5, and a terminal 2 is mounted on the bottom of the connector plastic shell 1. The connector plastic shell 1 is fixed to the top of the brass housing 5 by riveting. The internally assembled terminal 2 enables electrical connection with external wiring harnesses. A thermally conductive material 8, in a paste-like form, is injected into the inner wall of the bottom of the brass housing 5 to create an efficient heat conduction path. An NTC thermistor 3, made of composite ceramic semiconductor material, is connected internally to the thermally conductive material 8. The terminal 2 and the NTC thermistor 3 are encapsulated by a packaging material 7, connecting the resistance pins of the NTC thermistor 3 to the terminal. 2. The welding parts are completely encapsulated, achieving thermal conductivity, insulation, and waterproofing properties after encapsulation, ensuring reliable electrical connections. A gasket 4 is installed at the top of the brass shell 5, and an outer sealing ring 6 is installed at the bottom of the brass shell 5. The bottom of the component is sealed to the cooling pipe through the outer sealing ring 6. The top gasket 4 forms a pressure seal between the connector plastic shell 1 and the brass shell 5, constituting a double protection system. When the coolant temperature changes, the brass shell 5 quickly transfers heat energy to the NTC thermistor 3 through the thermally conductive material 8. The NTC thermistor 3 generates a non-linear signal by changing its resistance value with temperature, which is output to the system through terminal 2 to achieve the regulation of the coolant working state.

[0026] See Figure 3 , Figure 4 , Figure 5 , Figure 6 A contact block 16 is installed on one outer wall of the brass casing 5. The outer wall of the contact block 16 is in contact with the latching assembly. The latching assembly includes a fixing block 10 installed on one outer wall of the mounting casing 9. The fixing block 10 is fixed to the outer wall of the mounting casing 9. A button 11 is slidably connected to the inner wall of the fixing block 10. A slide rod 12 is slidably connected to the middle of the fixing block 10. A shaped slide block 13 is slidably connected to the inner wall of the slide rod 12. A spring 14 is installed at the top of the slide rod 12. The top of the slide rod 12 is pre-pressed by the spring 14. A stop block 15 is connected to the bottom of the brass casing. 5. Insert the housing 9 into the mounting housing. The contact block 16 contacts the outer end of the stop block 15. The stop block 15 is compressed into the fixed block 10 by the pushing force of the contact block 16. The spring 14 is compressed and stores energy. When the slide rod 12 moves, the irregular sliding block 13 slides along the inner wall of the slide rod 12. The inclined surface of the irregular sliding block 13 cooperates with the inner groove of the slide rod 12, which drives the stop block 15 to start moving. When the contact block 16 no longer contacts the stop block 15, the previously stored energy of the spring 14 is released, which drives the stop block 15 to reset, realizing the contact and locking of the contact block 16, and ensuring the stability of the component.

[0027] See Figure 5One side of the outer wall of the fixing block 10 is fixedly connected to the outer wall of the mounting housing 9. Both sides of the inner wall of the button 11 are equipped with inclined protrusions. The two inclined protrusions are respectively connected to the outer walls of the two sides of the irregular sliding block 13. When the button 11 is pressed vertically, the inclined protrusions on the inner wall of the button 11 push the outer walls of the two sides of the irregular sliding block 13, causing the slide rod 12 and the stop block 15 to move backward, no longer resisting and fixing the contact block 16, so that the component can be quickly pulled out.

[0028] Working principle: Under the preload of the first spring 14, the slide rod 12 extends out of the stop block 15. The irregularly shaped sliding block 13 clamps the inner wall of the slide rod 12 through the inclined self-locking structure, keeping the stop block 15 in the extended state. When the sensor brass housing 5 is inserted into the mounting housing 9, the abutment block 16 on the side wall of the brass housing 5 pushes the slide rod 12 and the stop block 15 into the fixing block 10. The spring 14 stores energy, and at the same time, the irregularly shaped sliding block 13 slides along the slide rod 12 and enhances the radial clamping force, so that the abutment block 16 abuts against one side of the stop block 15 to achieve fixation. When the component needs to be disassembled, press the button 11 so that its bottom inclined surface pushes the irregularly shaped sliding block 13 radially inward, causing the stop block 15 to retract backward and no longer block the abutment block 16, allowing the component to be directly pulled out and replaced.

Claims

1. A snap-fit ​​type automotive coolant NTC temperature sensor, including a brass housing (5), characterized in that: The top of the brass housing (5) is fitted with a connector plastic housing (1), the bottom of the connector plastic housing (1) is fitted with a terminal (2), the inner wall of the bottom of the brass housing (5) is filled with a thermally conductive material (8), the inside of the thermally conductive material (8) is connected to an NTC thermistor (3), the outer wall of the NTC thermistor (3) is fitted with an encapsulation material (7), the top of the NTC thermistor (3) is connected to the bottom of the terminal (2), the top of the brass housing (5) is fitted with a gasket (4), the bottom of the brass housing (5) is fitted with an outer sealing ring (6), and the outside of the brass housing (5) is fitted with an installation housing (9).

2. The snap ring mounted automotive coolant NTC temperature sensor as described in claim 1, characterized in that: A contact block (16) is installed on one side of the outer wall of the brass shell (5). The outer wall of the contact block (16) is in contact with the buckle assembly. The buckle assembly includes a fixing block (10) installed on one side of the outer wall of the mounting shell (9). A button (11) is slidably connected to the inner wall of the fixing block (10). A slide rod (12) is slidably connected to the middle of the fixing block (10). A non-circular sliding block (13) is slidably connected to the inner wall of the slide rod (12). A spring (14) is installed at the top of the slide rod (12). A stop block (15) is connected to the bottom of the slide rod (12).

3. The snap ring mounted automotive coolant NTC temperature sensor as described in claim 2, characterized in that: The outer sealing ring (6) is made of rubber, and the encapsulation material (7) has good thermal conductivity, adhesion and insulation capabilities.

4. The snap ring mounted automotive coolant NTC temperature sensor as described in claim 3, characterized in that: The NTC thermistor (3) is made of composite ceramic material, and the terminal (2) and the NTC thermistor (3) are encapsulated by encapsulation material (7).

5. The snap ring mounted automotive coolant NTC temperature sensor as described in claim 4, characterized in that: The washer (4) is sealed to the opposite end of the connector plastic shell (1) by riveting the brass shell (5). The material of the washer (4) is an elastic material.

6. The snap ring mounted automotive coolant NTC temperature sensor as described in claim 5, characterized in that: The thermal conductive material (8) is in the form of a paste. The thermal conductive material (8) is connected to the inner wall of the brass shell (5) at the bottom. The inner wall of the thermal conductive material (8) near the top is plugged into the bottom of the NTC thermistor (3).

7. The snap ring mounted automotive coolant NTC temperature sensor as described in claim 6, characterized in that: The outer wall of one side of the fixed block (10) is fixedly connected to the outer wall of the mounting shell (9). The inner wall of the button (11) is equipped with inclined protrusions on both sides. The two inclined protrusions are respectively connected to the outer walls of the two sides of the irregular sliding block (13).

8. The snap ring mounted automotive coolant NTC temperature sensor as described in claim 7, characterized in that: The bottom end of the spring (14) is fixedly connected to the top end of the slide rod (12), and the top end of the spring (14) is fixedly connected to the inner top wall of the button (11).

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