NTC (Negative Temperature Coefficient) temperature sensor and component thereof

Abstract

The invention belongs to the technical field of temperature sensors, and discloses an NTC (Negative Temperature Coefficient) temperature sensor, which comprises a plastic shell serving as a shell of the temperature sensor; the terminal is connected to the plastic shell, is matched with the plastic shell and is used for being connected with an external plug wire harness; an NTC thermistor connected to the terminal; the brass shell is connected to the NTC thermistor and is used for protecting the NTC thermistor; by adopting the metal shell with a special structure and matching with a high-precision element, the temperature sensor can meet the precise temperature requirement of a cooling liquid system, is good in waterproof performance and easy to install, has the characteristics of high temperature measurement speed, stable work, convenience in installation, strong anti-interference capability, high precision and strong waterproof capability, can keep the interior stable, and is convenient to maintain. And the phenomenon that the joint of the sensor shakes in the thermal expansion and cold contraction process is prevented, so that elements in the sensor are more stable.

Description

Technical Field

[0001] The present invention belongs to the technical field of temperature sensors, and in particular relates to an NTC temperature sensor and components thereof. Background Art

[0002] In recent years, the growth of the temperature sensor industry has been mainly due to the continued rise in demand in the automotive field. With the rapid industrialization process in the Asia-Pacific region, especially the continuous expansion of the automotive and industrial manufacturing fields, the demand for temperature sensors has shown a significant growth trend.

[0003] In recent years, the "localization" strategies of major international auto parts manufacturers have driven domestic auto parts suppliers to optimize and innovate their products, bringing new development momentum and opportunities for domestic substitution. Many national industrial policies have clearly emphasized and supported the development of my country's automotive electronics industry. As a supporting industry in the automotive industry chain, automotive sensors are crucial to improving the level of automobile manufacturing.

[0004] Although automotive sensors have a certain degree of waterproof capability, their waterproof performance is not sufficient to meet the needs in extremely humid or underwater environments. Summary of the Invention

[0005] The present invention addresses the problem that existing automotive sensors have certain waterproof capabilities, but their waterproof performance is insufficient to meet the requirements in extremely humid or underwater environments. The present invention proposes the following technical solutions:

[0006] An NTC temperature sensor includes: a plastic shell, the plastic shell serving as an outer shell of the temperature sensor;

[0007] The terminal is connected to the plastic shell and cooperates with the plastic shell for connecting to an external wiring harness;

[0008] An NTC thermistor connected to the terminal;

[0009] A brass housing connected to the NTC thermistor, wherein the NTC thermistor is encapsulated inside the brass housing;

[0010] The sealing assembly includes: a gasket, an outer sealing ring and an inner sealing structure; the gasket is connected between the brass shell and the plastic shell and is used to seal the connection between the brass shell and the inside of the plastic shell; the outer sealing ring is connected to the brass shell, and the inner sealing structure seals the gap between the brass shell and the plastic shell.

[0011] As a preferred embodiment of the above technical solution, a sealing mechanism is provided on the outside of the connection between the terminal and the NTC thermistor, and the sealing mechanism includes a packaging member, and the packaging member is connected to the outside of the terminal and the NTC thermistor.

[0012] As a preferred embodiment of the above technical solution, the bottom end of the NTC thermistor is connected to a heat-conducting structure, which includes: a heat-conducting member connected between the NTC thermistor and the brass housing for guiding heat.

[0013] As a preferred embodiment of the above technical solution, the inner sealing structure includes:

[0014] The circular ring is connected to the brass shell; the lifting bar is connected to the circular ring; the L-shaped ring is connected to the lifting bar; the inner sealing ring is linked to the lifting bar through the L-shaped ring; the lifting bar is squeezed between the brass shell and the plastic shell through the linkage of the lifting bar and the L-shaped ring.

[0015] As a preferred embodiment of the above technical solution, the sealing structure further includes a pressing structure, and the pressing structure includes:

[0016] The pressure rod is connected to the circular ring, the flip plate is connected to the bottom of the circular ring, and the torsion spring is connected to the flip plate and is used to drive the flip plate to reset.

[0017] As a preferred embodiment of the above technical solution, the inner sealing structure further includes an extrusion structure, which includes:

[0018] a driving structure connected to the pressure rod and the ring, for converting vertical movement force into horizontal movement force;

[0019] Extruded strips, connected to the ring and evenly distributed along the circumference;

[0020] The extrusion plate is connected to the extrusion bar and moves toward the center of the plastic shell through the driving structure and the extrusion bar.

[0021] As a preferred embodiment of the above technical solution, the driving structure includes a rack and a gear: the rack is connected to the pressure rod, and the gear is connected to the ring.

[0022] As a preferred embodiment of the above technical solution, the material of the heat conducting component is thermal grease, and the material of the packaging component is epoxy resin.

[0023] A component suitable for the above-mentioned NTC temperature sensor includes a mounting base: connected to the plastic shell and the brass shell;

[0024] The stainless steel retaining spring is connected to the mounting seat and is used for fixing the mounting seat and the plastic shell.

[0025] The beneficial effects of the present invention are:

[0026] (1) The metal shell with a special structure is matched with high-precision components. It is a temperature sensor that can meet the precise temperature requirements of the coolant system and has good waterproof performance and is easy to install. It has the characteristics of fast temperature measurement speed, stable operation, easy installation, strong anti-interference ability, high precision and strong waterproof ability. At the same time, it can keep the internal stability and prevent the shaking of the sensor connection caused by thermal expansion and contraction, thereby making the internal components of the sensor more stable.

[0027] (2) The terminal and the plastic shell can be abutted, making the installation between the terminal and the plastic shell more stable, thereby improving the stability between the terminal and the plastic shell after installation, and further indirectly improving the tightness of the temperature sensor after assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 FIG. 1 is a schematic diagram of the structure of an NTC temperature sensor in Example 1;

[0029] Figure 2 FIG. 1 shows a cross-sectional view of an NTC temperature sensor in Example 1;

[0030] Figure 3 Shown is Figure 2 Schematic diagram of the structure of area A;

[0031] Figure 4 Shown is a schematic diagram of the assembly structure of the NTC temperature sensor component in Example 1.

[0032] In the figure: 1. Plastic shell; 2. Terminal; 3. NTC thermistor; 4. Washer; 5. Brass shell; 6. Outer sealing ring; 7. Encapsulation; 8. Thermal conductor; 91. Ring; 92. Lifting bar; 93. L-shaped ring; 94. Inner sealing ring; 95. Flip plate; 96. Torsion spring; 97. Pressure rod; 98. Drive structure; 99. Extrusion bar; 910. Extrusion plate; 10. Mounting seat; 11. Stainless steel retaining ring. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0034] Example 1: The present invention provides an NTC temperature sensor, such as Figures 1 to 3As shown, it includes: a plastic shell 1, a terminal 2, an NTC thermistor 3, a brass shell 5 and a sealing assembly. The plastic shell 1 serves as the shell of the temperature sensor; the terminal 2 is connected to the plastic shell 1 and cooperates with the plastic shell 1 for connecting to an external wiring harness; the NTC thermistor 3 is connected to the terminal 2; the brass shell 5 is connected to the NTC thermistor 3, and the NTC thermistor 3 is encapsulated inside the brass shell 5; the sealing assembly includes: a gasket 4, an outer sealing ring 6 and an inner sealing structure; the gasket 4 is connected between the brass shell 5 and the plastic shell 1 to seal the connection between the brass shell 5 and the inside of the plastic shell 1; the outer sealing ring 6 is connected to the brass shell 5, and the inner sealing structure seals the gap between the brass shell 5 and the plastic shell 1;

[0035] A sealing mechanism is provided on the outside of the connection between the terminal 2 and the NTC thermistor 3. The sealing mechanism includes a packaging member 7, which is connected to the outside of the terminal 2 and the NTC thermistor 3. A heat-conducting structure is connected to the bottom end of the NTC thermistor 3. The heat-conducting structure includes: a heat-conducting member 8, which is connected between the NTC thermistor 3 and the brass shell 5 and is used to guide heat. The material of the heat-conducting member 8 is thermal grease, and the material of the packaging member 7 is epoxy resin.

[0036] The internal gasket 4, the external sealing ring 6 and the internal sealing structure of the sealing assembly are used to position the plastic shell 1 and the brass shell 5 and seal the middle and inner parts of the connection between the plastic shell 1 and the brass shell 5, thereby improving the waterproof performance and further increasing the extrusion stability of the connection between the two to prevent shaking between the two.

[0037] When in use, install it between the terminal 2 and the plastic shell 1, connect the terminal 2 to the NTC thermistor 3, and then apply the package 7 to the outside of the connection between the terminal 2 and the NTC thermistor 3. Then put the heat conductor 8 into the brass shell 5, and then place the gasket 4 inside the brass shell 5. Then install the inner sealing structure between the inner wall of the brass shell 5, and then install it between the plastic shell 1 and the brass shell 5. At this time, the package 7 is inserted into the heat conductor 8 to form the assembly of the NTC temperature sensor.

[0038] Specifically, the plastic shell 1 and the terminal 2 are connected to the external wiring harness to achieve electrical connection; the terminal 2 is connected through the inside of the plastic shell 1, and the NTC thermistor 3 is attached to the outside of the terminal 2. The NTC thermistor 3 is a composite ceramic material with semiconductor properties. Through glass shell packaging, this type of component has the advantages of sensitive temperature and good stability. After the NTC sensor is manufactured, the NTC thermistor 3 is located in the coolant temperature sensitive area at the bottom of the brass shell 5, so it can respond to temperature changes in time. The package 7 is welded to the NTC thermistor 3 and the outside of the terminal 2. The package 7 is specifically epoxy resin. Epoxy resin has good thermal conductivity, bonding and insulation capabilities. The NTC thermistor 3, the solder joint and the terminal 2 at the solder joint are packaged together through the packaging process. While ensuring the response time of the sensor, it has strong insulation ability, moisture-proof and waterproof capabilities. , the brass shell 5 is sleeved on the outside of the plastic shell 1. The brass shell 5 has good elongation and excellent thermal conductivity. Through mold molding, it can transfer the energy generated by temperature changes faster. The surface is anti-corrosion treated to effectively prevent coolant erosion. The gasket 4 is compressed by riveting the pressure between the brass shell 5 and the plastic shell 1, which can be moisture-proof and waterproof, and plays a sealing role. The outer sealing ring 6 is sleeved on the outside of the brass shell 5. The outer sealing ring 6 is made of a rubber material suitable for coolant. The sensor plays a sealing role after being installed at the application end. The heat conductor 8 is arranged at the bottom of the brass shell 5 and is located on the outside of the packaging part 7. The heat conductor 8 has good thermal conductivity and is in a paste-like state without fluidity. It is injected into the bottom of the brass shell 5 through special equipment. After the encapsulated resistor semi-finished product is connected to the brass shell 5 by riveting, the NTC thermistor 3 is inserted into the heat conductor to enhance the thermal conductivity of the sensor.

[0039] like Figure 2 and Figure 3As shown, the inner sealing structure includes: a circular ring 91, a lifting bar 92, an L-shaped ring 93 and an inner sealing ring 94. The circular ring 91 is connected to the brass shell 5; the lifting bar 92 is connected to the circular ring 91; the L-shaped ring 93 is connected to the lifting bar 92; the inner sealing ring 94 is linked to the lifting bar 92 through the L-shaped ring 93, and the lifting bar 92 is squeezed between the brass shell 5 and the plastic shell 1 through the linkage of the lifting bar 92 and the L-shaped ring 93. The sealing structure also includes a pressing structure, which includes: a flip plate 95, a torsion spring 96 and a pressure rod 97. The pressure rod 97 is connected to the circular ring 91, and the flip plate 95 is connected to the bottom of the circular ring 91. The torsion spring 96 is connected to the flip plate 95 for driving the flip plate 95 to reset. The inner sealing structure also includes an extrusion structure, which includes a driving structure 98, an extrusion bar 99 and an extrusion plate 910. The driving structure 98 is connected to the pressure rod 97 and the ring 91 for converting the vertical movement force into a horizontal movement force; the extrusion bar 99 is connected to the ring 91 and is evenly distributed along the circumference; the extrusion plate 910 is connected to the extrusion bar 99 and moves toward the center of the plastic shell 1 through the driving structure 98 and the extrusion bar 99. The driving structure 98 includes a rack and a gear: the rack is connected to the pressure rod 97, and the gear is connected to the ring 91.

[0040] The waterproof performance of the NTC temperature sensor after installation is improved by increasing the sealing performance. However, due to the gap between the two, the matching performance between the two objects is reduced during the thermal expansion and contraction process. At this time, it is easy to cause shaking at the connection between the plastic shell 1 and the brass shell 5, which can easily lead to the breakage of the package 7 inside the NTC temperature sensor. At this time, the internal sealing structure not only improves the sealing performance of the connection between the plastic shell 1 and the brass shell 5, but also can squeeze the connection between the plastic shell 1 and the brass shell 5, so that the center point between the connection between the plastic shell 1 and the brass shell 5 remains in the same vertical line, reducing the shaking between the two, thereby improving the safety of the internal package 7.

[0041] During use, when the brass shell 5 and the plastic shell 1 are installed, the plastic shell 1 squeezes the pressure rod 97. When the pressure rod 97 moves downward, it drives the flip plate 95 to deflect. At this time, the torsion spring 96 twists, and when the flip plate 95 rotates, it drives the lifting bar 92 to rise inside the ring 91. Since the multiple lifting bars 92 move and drive the L-shaped ring 93 to rise, the L-shaped ring 93 rises and enters the internal gap between the brass shell 5 and the plastic shell 1. At this time, the inner sealing ring 94 and the L-shaped ring 93 enter synchronously. The inner gap between the brass shell 5 and the plastic shell 1 is formed, thereby increasing the sealing performance of the connection between the brass shell 5 and the plastic shell 1. At the same time, when the pressure rod 97 is in operation, it drives the driving structure 98 to operate. When the driving structure 98 is in operation, it drives the extrusion bar 99 to move. When the extrusion bar 99 moves, it drives the extrusion plate 910 to move. After the extrusion plate 910 moves, it squeezes the bottom end of the plastic shell 1. At this time, multiple extrusions are formed between the plastic shell 1 and the brass shell 5, thereby making the center lines of the plastic shell 1 and the brass shell 5 coincide with each other.

[0042] Specifically, the circular ring 91 is welded to the inside of the brass shell 5, and the circular ring 91 is vertically movably connected to four lifting bars 92. The tops of the four lifting bars 92 are clamped with the same L-shaped ring 93, and a placement groove is provided inside the L-shaped ring 93. The inner side of the L-shaped ring 93 is clamped and installed inside the placement groove with an inner sealing ring 94. The bottom end of the circular ring 91 is symmetrically and equidistantly integrally formed with four groups of vertical plates. Each group of vertical plates is composed of two symmetrically arranged straight plates. A round rod is connected between the two opposite straight plates. The flip plate 95 is rotatably connected to the outside of the round rod. A torsion spring 96 is provided between the flip plate 95 and the straight plate at the outside of the round rod. The interior of the circular ring 91 is movably connected up and down at a position on one side of the lifting bar 92. It is connected to a driving structure 98, which is composed of a rack and a gear: the rack is welded to one side of the pressure rod 97, and a limiting groove is provided inside the ring 91 at a position corresponding to one side of the rack. The gear is rotatably connected to the inside of the ring 91, and a cavity is provided inside the ring 91 at a position corresponding to the outer side of the gear. The gear and the rack are meshed with each other, and an extrusion strip 99 is meshed and connected to the bottom end of the outer side of the gear. A tooth pattern is provided at the top of the extrusion strip 99, and the tooth pattern is meshed with the outer side of the gear. A slide groove for limiting the movement of the extrusion strip 99 is provided inside the ring 91, and the extrusion strip 99 is slidably connected to the inside of the slide groove. An extrusion plate 910 is integrally formed at one end of the extrusion strip 99, and one end face of the extrusion plate 910 is in contact with the center point of the bottom end of the plastic shell 1.

[0043] Example 2, as Figure 3 As shown, a component suitable for the above-mentioned NTC temperature sensor includes a mounting base 10: connected to the plastic shell 1 and the brass shell 5; a stainless steel retaining spring 11, connected to the mounting base 10, for fixing the mounting base 10 and the plastic shell 1;

[0044] Used for installation between NTC temperature sensor and component, so that the NTC temperature sensor and component remain fixed;

[0045] When in use, the stainless steel retaining spring 11 is a separate component and is separated from the sensor when not installed at the application end. After the NTC temperature sensor assembled in Example 1 is inserted into the mounting base 10, the stainless steel retaining spring 11 is installed, and the NTC temperature sensor is fixed to the mounting base 10 through the stainless steel retaining spring 11;

[0046] Specifically, the mounting base 10 is sleeved on the outside of the NTC temperature sensor, and the stainless steel clip 11 is slidably connected to the inside of the mounting base 10 and is clamped to the outside of the NTC temperature sensor.

[0047] Working Principle: When installing the NTC temperature sensor, install it between the terminal 2 and the plastic shell 1. At this time, connect the terminal 2 to the NTC thermistor 3. Then apply the encapsulation 7 to the outside of the connection between the terminal 2 and the NTC thermistor 3. Then put the thermal conductor 8 into the brass shell 5. At this time, place the gasket 4 inside the brass shell 5. Then install the inner sealing structure between the inner wall of the brass shell 5. Then install it between the plastic shell 1 and the brass shell 5. At this time, insert the encapsulation 7 into the thermal conductor 8 to form the overall assembly of the NTC temperature sensor.

[0048] When the brass shell 5 and the plastic shell 1 are installed, the plastic shell 1 squeezes the pressure rod 97. When the pressure rod 97 moves downward, it drives the flip plate 95 to deflect. At this time, the torsion spring 96 twists, and when the flip plate 95 rotates, it drives the lifting bar 92 to rise inside the ring 91. As the multiple lifting bars 92 move, they drive the L-shaped ring 93 to rise. After the L-shaped ring 93 rises, it enters the internal gap between the brass shell 5 and the plastic shell 1. At this time, the inner sealing ring 94 and the L-shaped ring 93 enter the brass shell 5 and the plastic shell 1 at the same time. In the internal gap between the copper shell 5 and the plastic shell 1, the sealing of the connection between the brass shell 5 and the plastic shell 1 is increased. At the same time, when the pressure rod 97 is in operation, it drives the driving structure 98 to operate. When the driving structure 98 operates, it drives the extrusion bar 99 to move. When the extrusion bar 99 moves, it drives the extrusion plate 910 to move. After the extrusion plate 910 moves, it squeezes the bottom end of the plastic shell 1. At this time, multiple extrusions are formed between the plastic shell 1 and the brass shell 5, so that the center lines of the plastic shell 1 and the brass shell 5 remain coincident.

[0049] Finally, the mounting base 10 is sleeved onto the outside of the NTC temperature sensor, and the stainless steel retaining spring 11 is slidably connected to the inside of the mounting base 10 and clamped to the outside of the NTC temperature sensor, thereby completing the installation between the NTC temperature sensor and the mounting base 10.

[0050] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same.

Claims

1. An NTC temperature sensor, characterized in that: include: A plastic shell (1), the plastic shell (1) serves as a housing of the temperature sensor; A terminal (2) is connected to the plastic shell (1) and cooperates with the plastic shell (1) for connecting to an external wiring harness; An NTC thermistor (3) connected to the terminal (2); A brass housing (5) is connected to the NTC thermistor (3), and the NTC thermistor (3) is encapsulated inside the brass housing (5); A sealing assembly comprising: a gasket (4), an outer sealing ring (6) and an inner sealing structure; The gasket (4) is connected between the brass shell (5) and the plastic shell (1) and is used to seal the internal connection between the brass shell (5) and the plastic shell (1). The outer sealing ring (6) is connected to the brass shell (5), and the inner sealing structure seals the gap between the brass shell (5) and the plastic shell (1).

2. The NTC temperature sensor according to claim 1, characterized in that A sealing mechanism is provided on the outside of the connection between the terminal (2) and the NTC thermistor (3), and the sealing mechanism includes a packaging member (7). The packaging member (7) is connected to the outside of the terminal (2) and the NTC thermistor (3).

3. The NTC temperature sensor according to claim 2, characterized in that: The bottom end of the NTC thermistor (3) is connected to a heat-conducting structure, which comprises a heat-conducting member (8), and the heat-conducting member (8) is connected between the NTC thermistor (3) and the brass housing (5) for guiding heat.

4. The NTC temperature sensor according to claim 3, characterized in that The inner sealing structure comprises: The circular ring (91) is connected to the brass shell (5); the lifting bar (92) is connected to the circular ring (91); the L-shaped ring (93) is connected to the lifting bar (92); the inner sealing ring (94) is linked to the lifting bar (92) through the L-shaped ring (93); the lifting bar (92) is squeezed between the brass shell (5) and the plastic shell (1) through the linkage of the lifting bar (92) and the L-shaped ring (93).

5. The NTC temperature sensor according to claim 4, characterized in that: The sealing structure further includes a pressing structure, and the pressing structure includes: A pressure rod (97) is connected to the circular ring (91), a flip plate (95) is connected below the circular ring (91), and a torsion spring (96) is connected to the flip plate (95) for driving the flip plate (95) to reset.

6. The NTC temperature sensor according to claim 5, characterized in that: The inner sealing structure further comprises an extrusion structure, which comprises: a driving structure (98), connected to the pressure rod (97) and the ring (91), for converting vertical movement force into horizontal movement force; Extruded strips (99), connected to the ring (91), uniformly distributed along the circumference; The extrusion plate (910) is connected to the extrusion bar (99) and moves toward the center of the plastic shell (1) through the driving structure (98) and the extrusion bar (99).

7. The NTC temperature sensor according to claim 6, characterized in that: The driving structure (98) includes a rack and a gear: the rack is connected to the pressure rod (97), and the gear is connected to the ring (91).

8. The NTC temperature sensor according to claim 7, characterized in that: The material of the heat conducting component (8) is heat conducting grease, and the material of the packaging component (7) is epoxy resin.

9. A component suitable for the NTC temperature sensor according to claim 8, characterized in that: It comprises a mounting seat (10) connected to the plastic shell (1) and the brass shell (5); A stainless steel retaining spring (11) is connected to the mounting seat (10) and is used to fix the mounting seat (10) and the plastic shell (1).

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