Ntc temperature sensor and component thereof

Abstract

The application belongs to the technical field of temperature sensors, and discloses an NTC temperature sensor, which comprises a plastic shell, a terminal, an NTC thermistor and a brass shell; the plastic shell is used as the shell of the temperature sensor; the terminal is connected to the plastic shell and cooperates with the plastic shell, and is used for connecting with an external plug wire bundle; the NTC thermistor is connected to the terminal; the brass shell is connected to the NTC thermistor and is used for protecting the NTC thermistor; the metal shell with a special structure is matched with high-precision elements; the temperature sensor can meet the precise temperature requirement of a cooling liquid system, has good waterproof performance and is easy to install; the temperature sensor has the characteristics of fast temperature measurement speed, stable work, easy installation, strong anti-interference ability, high precision and strong waterproof ability; meanwhile, the internal part is kept stable, the phenomenon that the sensor connection part shakes in the thermal expansion and cold contraction process is prevented, and the internal elements of the sensor are more stable.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of temperature sensors, and particularly relates to an NTC temperature sensor and a component thereof. BACKGROUND

[0002] In recent years, the growth of the temperature sensor industry is mainly due to the continuous rise in demand in the automotive field, and 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" strategy of major international automobile parts manufacturers has driven domestic automobile parts suppliers to optimize and innovate their products, bringing new development momentum and opportunities for domestic substitution. In a number of national industrial policies, the development of China's automotive electronics industry is clearly valued and supported. Automotive sensors, as a supporting industry in the automotive industry chain, are crucial to improving automotive manufacturing levels.

[0004] Although automotive sensors have certain waterproof capabilities, their waterproof performance is insufficient to meet the needs in extremely humid or underwater environments. SUMMARY

[0005] The present application is directed to the problem that the automotive sensors in the prior art have certain waterproof capabilities, but their waterproof performance is insufficient to meet the needs in extremely humid or underwater environments. The following technical solutions are proposed:

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

[0007] a terminal connected to the plastic shell and cooperating with the plastic shell for connecting with an external plug wire bundle;

[0008] an NTC thermistor connected to the terminal;

[0009] a brass shell connected to the NTC thermistor, the NTC thermistor being packaged inside the brass shell;

[0010] a sealing assembly comprising a gasket, an outer sealing ring and an inner sealing structure; the gasket is connected between the brass shell and the plastic shell for sealing the connection between the brass shell and 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 outside the connection between the terminal and the NTC thermistor, and the sealing mechanism comprises a packaging member connected to the outside of the terminal and the NTC thermistor.

[0012] As the preferred technical scheme of the above, the NTC thermistor is connected with a heat-conducting structure at the bottom end, and the heat-conducting structure comprises a heat-conducting member connected between the NTC thermistor and the brass shell for guiding heat.

[0013] As the preferred technical scheme of the above, the inner sealing structure comprises:

[0014] a circular ring connected to the brass shell, a lifting bar connected to the circular ring, an L-shaped ring connected to the lifting bar, and an inner sealing ring linked with the lifting bar through the L-shaped ring, and the lifting bar is formed in extrusion between the brass shell and the plastic shell through linkage of the lifting bar and the L-shaped ring.

[0015] As the preferred technical scheme of the above, the sealing structure further comprises a pressing structure, and the pressing structure comprises:

[0016] a pressing rod connected to the circular ring, a turnover plate connected below the circular ring, and a torsional spring connected to the turnover plate for driving the turnover plate to reset.

[0017] As the preferred technical scheme of the above, the inner sealing structure further comprises an extrusion structure, and the extrusion structure comprises:

[0018] a driving structure connected to the pressing rod and the circular ring for converting a vertical moving force into a horizontal moving force.

[0019] an extrusion bar connected to the circular ring and uniformly distributed in the circumferential direction.

[0020] an extrusion plate connected to the extrusion bar and moved to the center of the plastic shell through the driving structure and the extrusion bar.

[0021] As the preferred technical scheme of the above, the driving structure comprises a rack and a gear, and the rack is connected to the pressing rod and the gear is connected to the circular ring.

[0022] As the preferred technical scheme of the above, the heat-conducting member is made of heat-conducting grease, and the packaging member is made of epoxy resin.

[0023] A component suitable for the NTC temperature sensor comprises a mounting seat connected to the plastic shell and the brass shell.

[0024] A stainless steel clasp is connected to the mounting seat for fixing between the mounting seat and the plastic shell.

[0025] The present application has the following beneficial effects:

[0026] (1) the metal shell with special structure is matched with high-precision components, so that the temperature sensor can meet the precise temperature requirement of the cooling liquid system, has good waterproof performance, is easy to install, has the characteristics of fast temperature measurement speed, stable work, easy installation, strong anti-interference ability, high precision and strong waterproof ability, can keep the inside stable, prevent the sensor connection from shaking in the thermal expansion and cold shrinkage process, and make the internal components of the sensor more stable;

[0027] (2) the terminal and the plastic shell can be abutted, so that the terminal and the plastic shell are installed more stably, the stability of the terminal and the plastic shell after installation is improved, and the tightness of the temperature sensor after assembly is further improved indirectly. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 Fig. 1 shows a structure diagram of an NTC temperature sensor in Example 1;

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

[0030] Figure 3 Fig. 3 shows a structure diagram of area A in Fig. 1; Figure 2

[0031] Figure 4 Fig. 4 shows an assembly structure diagram of an NTC temperature sensor component in Example 1.

[0032] In the figure: 1, plastic shell; 2, terminal; 3, NTC thermistor; 4, gasket; 5, brass shell; 6, outer sealing ring; 7, packaging piece; 8, heat conducting piece; 91, circular ring; 92, lifting bar; 93, L-shaped ring; 94, inner sealing ring; 95, turnover plate; 96, torsion spring; 97, pressing rod; 98, driving structure; 99, extrusion strip; 910, extrusion plate; 10, mounting seat; 11, stainless steel clasp spring. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the present application will be described clearly and completely in combination with the embodiments.

[0034] Example 1: the present application provides an NTC temperature sensor, as shown in Figures 1 to 3 ​As 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 outer shell of the temperature sensor; the terminal 2 is connected to and mates with the plastic shell 1 for connection 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 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.

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

[0036] The sealing assembly uses an internal gasket 4, an external sealing ring 6, and an internal sealing structure to position the plastic shell 1 and the brass shell 5 and seal the middle and interior of the connection between the plastic shell 1 and the brass shell 5, thereby improving water resistance and further increasing the compression stability of the connection between the two to prevent shaking between them.

[0037] In use, install the terminal 2 and the plastic shell 1, then connect the terminal 2 to the NTC thermistor 3, then coat the outside of the connection between the terminal 2 and the NTC thermistor 3, then put the heat-conducting component 8 into the brass shell 5, then place the gasket 4 into the brass shell 5, then install the inner sealing structure between the inner wall of the brass shell 5, then install the plastic shell 1 and the brass shell 5, so that the package 7 is inserted into the heat-conducting component 8, forming the overall assembly of the NTC temperature sensor;

[0038] Specifically, the plastic shell 1 and the terminal 2 are connected with the wire harness outside to realize electrical connection; the terminal 2 is connected to 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 characteristics, which is packaged by glass. Such components have the advantages of temperature sensitivity, good stability, etc. After the NTC sensor is made, the NTC thermistor 3 is located in the cooling liquid temperature sensitive area at the bottom of the brass shell 5, so it can respond to temperature changes in time. The packaging piece 7 is welded to the outside of the NTC thermistor 3 and the terminal 2. The packaging piece 7 is specifically an epoxy resin, which has good heat conductivity, bonding and insulation capacity. Through the packaging process, the NTC thermistor 3, the welding point and the terminal 2 at the welding position are packaged together, which has strong insulation capacity, moisture-proof and waterproof capacity under the condition of ensuring the response time of the sensor. The brass shell 5 is sleeved on the outside of the plastic shell 1. The brass shell 5 has good extension performance and excellent heat conductivity. Through mold forming, it can transfer the energy generated by temperature changes faster. The surface is treated by anti-corrosion to effectively prevent the corrosion of the cooling liquid. The gasket 4 is pressed tightly by the pressure between the brass shell 5 and the plastic shell 1 through riveting, which can prevent moisture and water, and has a sealing effect. The outer sealing ring 6 is sleeved on the outside of the brass shell 5. The outer sealing ring 6 is made of rubber material suitable for cooling liquid. After the sensor is installed at the application end, it plays a sealing role. The heat conducting piece 8 is arranged at the bottom end of the brass shell 5 and outside the packaging piece 7. The heat conducting piece 8 has good heat conductivity and is in paste form without fluidity. It is inserted into the bottom of the brass shell 5 through special setting. After the packaged resistance semi-finished product and the brass shell 5 are connected by riveting, the NTC thermistor 3 is inserted into the heat conducting piece to enhance the heat conducting performance of the sensor.

[0039] As Figure 2 and Figure 3As shown, the inner sealing structure includes: a circular ring 91, a lifting strip 92, an L-shaped ring 93, and an inner sealing ring 94. The circular ring 91 is connected to the brass outer shell 5; the lifting strip 92 is connected to the circular ring 91; the L-shaped ring 93 is connected to the lifting strip 92; the inner sealing ring 94 is linked to the lifting strip 92 through the L-shaped ring 93. The lifting strip 92, through the linkage of the lifting strip 92 and the L-shaped ring 93, forms a compression between the brass outer shell 5 and the plastic shell 1. The sealing structure also includes a pressing structure, which includes: a flipping plate 95, a torsion spring 96, and a pressure rod 97. The pressure rod 97 is connected to the circular ring 91, and the flipping plate 95 is connected to the lower part of the circular ring 91. The torsion spring 96 is connected to the flip plate 95 to drive the flip plate 95 to reset. The inner sealing structure also includes a compression structure, which includes a drive structure 98, a compression strip 99, and a compression plate 910. The drive structure 98 is connected to the pressure rod 97 and the ring 91 to convert the vertical moving force into the horizontal moving force. The compression strip 99 is connected to the ring 91 and is evenly distributed circumferentially. The compression plate 910 is connected to the compression strip 99 and moves towards the center of the plastic shell 1 through the drive structure 98 and the compression strip 99. The drive 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] While increasing the sealing improves the waterproof performance of the NTC temperature sensor after installation, the gap between the two components can cause a decrease in their fit during thermal expansion and contraction. This can lead to movement at the connection between the plastic shell 1 and the brass shell 5, potentially causing the internal encapsulation 7 of the NTC temperature sensor to break. The internal sealing structure not only increases the sealing performance at the connection between the plastic shell 1 and the brass shell 5 but also compresses the two components, ensuring their center points remain aligned vertically. This reduces movement and improves the safety of the internal encapsulation 7.

[0041] During use, when the brass outer shell 5 and the plastic shell 1 are installed, the plastic shell 1 presses against the pressure rod 97. When the pressure rod 97 moves downward, it causes 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 bars 92 to rise inside the ring 91. As multiple lifting bars 92 move, they cause the L-shaped ring 93 to rise. After rising, the L-shaped ring 93 enters the internal gap connecting the brass outer shell 5 and the plastic shell 1. At this time, the inner sealing ring 94 enters synchronously with the L-shaped ring 93. The pressure bar 97 moves into the internal gap connecting the brass shell 5 and the plastic shell 1, increasing the sealing at the connection. Simultaneously, the pressure bar 97 drives the drive structure 98, which in turn moves the extrusion bar 99. The extrusion bar 99 moves the extrusion plate 910, which then extrudes the bottom of the plastic shell 1. This creates multiple extrusions between the plastic shell 1 and the brass shell 5, ensuring that the center lines of the plastic shell 1 and the brass shell 5 remain aligned.

[0042] Specifically, the circular ring 91 is welded to the inside of the brass outer shell 5. Four lifting bars 92 are vertically and movably connected inside the circular ring 91. An L-shaped ring 93 is snapped between the tops of the four lifting bars 92. The L-shaped ring 93 has a placement groove inside, and an inner sealing ring 94 is snapped into the inner side of the L-shaped ring 93 within the placement groove. Four sets of vertical plates are symmetrically and equidistantly formed at the bottom of the circular ring 91. Each set of vertical plates consists of two symmetrically arranged straight plates. A round rod is connected through the two opposite straight plates. A flip plate 95 is rotatably connected to the outside of the round rod. A torsion spring 96 is installed between the flip plate 95 and the straight plates at the position outside the round rod. The internal part of the circular ring 91 is connected vertically and horizontally at a position on one side of the lifting bars 92. A drive structure 98 is provided, 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 corresponding to the position of the rack. The gear is rotatably connected inside the ring 91, and a cavity is provided inside the ring 91 corresponding to the position of the outer side of the gear. The gear and the rack mesh with each other, and an extrusion strip 99 is meshed and connected to the bottom end of the outer side of the gear. The top end of the extrusion strip 99 has teeth, which mesh with the outer side of the gear. A sliding groove is provided inside the ring 91 to restrict the movement of the extrusion strip 99, and the extrusion strip 99 is slidably connected inside the sliding 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 a plastic housing 1 and a brass housing 5; and a stainless steel retaining ring 11 connected to the mounting base 10 for fixing the mounting base 10 and the plastic housing 1.

[0044] The installation between the NTC temperature sensor and the component is achieved, so that the NTC temperature sensor is fixed with the component;

[0045] In use, the stainless steel clamping spring 11 is a separate component, which is separated from the sensor when not installed at the application end, and is installed after the NTC temperature sensor assembled according to the embodiment 1 is inserted into the mounting seat 10, so as to fix the NTC temperature sensor on the mounting seat 10 through the stainless steel clamping spring 11.

[0046] Specifically, the mounting seat 10 is sleeved with the outside of the NTC temperature sensor, and the stainless steel clamping spring 11 is slidingly connected to the inside of the mounting seat 10 and clamped to the outside of the NTC temperature sensor.

[0047] Working principle: when installing the NTC temperature sensor, the terminal 2 and the plastic shell 1 are installed, at this time the terminal 2 is connected with the NTC thermistor 3, then the encapsulant 7 is coated outside the connection between the terminal 2 and the NTC thermistor 3, then the heat-conducting piece 8 is put into the brass shell 5, at this time the gasket 4 is placed in the brass shell 5, then the inner sealing structure is installed between the inner wall of the brass shell 5, then the plastic shell 1 is installed with the brass shell 5, at this time the encapsulant 7 is inserted into the heat-conducting piece 8, forming the assembly of the NTC temperature sensor as a whole.

[0048] When the brass shell 5 and the plastic shell 1 are installed, at this time the plastic shell 1 extrudes the pressure rod 97, the pressure rod 97 moves downward to drive the deflection plate 95 to deflect, at this time the torsional spring 96 generates torsion, and when the deflection plate 95 rotates, the lifting strip 92 is driven to rise in the circular ring 91, since the plurality of lifting strips 92 move to drive the L-shaped ring 93 to rise, after the L-shaped ring 93 rises, it enters the internal gap of the connection between the brass shell 5 and the plastic shell 1, at this time the inner sealing ring 94 synchronously enters the internal gap of the connection between the brass shell 5 and the plastic shell 1, at this time the sealing property of the connection between the brass shell 5 and the plastic shell 1 is increased, and at the same time, when the pressure rod 97 operates, the driving structure 98 operates, when the driving structure 98 operates, the extrusion strip 99 moves, when the extrusion strip 99 moves, the extrusion plate 910 moves, after the extrusion plate 910 moves, the bottom end of the plastic shell 1 is extruded, at this time the plastic shell 1 and the brass shell 5 form multiple extrusions, so that the center line of the plastic shell 1 and the brass shell 5 coincide.

[0049] Finally, the mounting seat 10 is sleeved with the outside of the NTC temperature sensor, and the stainless steel clamping spring 11 is slidingly connected to the inside of the mounting seat 10 and clamped to the outside of the NTC temperature sensor, so as to complete the installation between the NTC temperature sensor and the mounting seat 10.

[0050] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit it.

Claims

1. An NTC temperature sensor, characterized in that, include: Plastic shell (1), plastic shell (1) serves as the outer shell of the temperature sensor; Terminal (2) is connected to and cooperates with the plastic shell (1) for connecting to an external wiring harness; NTC thermistor (3) is connected to the terminal (2); A brass casing (5) is connected to the NTC thermistor (3), and the NTC thermistor (3) is encapsulated inside the brass casing (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 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). The internal sealing structure includes: A circular ring (91) is connected to the brass outer shell (5); a lifting bar (92) is connected to the circular ring (91); an L-shaped ring (93) is connected to the lifting bar (92); an inner sealing ring (94) is linked with the lifting bar (92) through the L-shaped ring (93), and the L-shaped ring (93) is squeezed between the brass outer shell (5) and the plastic shell (1) through the linkage of the lifting bar (92) and the L-shaped ring (93); The inner sealing structure further includes a pressing structure, the pressing structure comprising: A pressure rod (97) is connected to the ring (91), a flip plate (95) is connected below the ring (91), and a torsion spring (96) is connected to the flip plate (95) for driving the flip plate (95) to reset. The inner sealing structure further includes a compression structure, which comprises: A drive structure (98), connected to the pressure rod (97) and the ring (91), is used to convert vertical moving force into horizontal moving force; An extrusion strip (99) is connected to the ring (91) and is evenly distributed circumferentially. The extrusion plate (910), connected to the extrusion strip (99), moves toward the center of the plastic shell (1) via the drive structure (98) and the extrusion strip (99); The drive 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). 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. When the flip plate (95) rotates, it drives the lifting bar (92) to rise inside the ring (91). As 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 connecting 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) simultaneously. In the internal gap connecting 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, the pressure rod (97) drives the drive structure (98) to run. When the drive structure (98) runs, it drives the extrusion strip (99) to move. When the extrusion strip (99) moves, it drives the extrusion plate (910) to move. After the extrusion plate (910) moves, it extrudes the bottom 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) are kept coincident.

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). The sealing mechanism includes a package (7) which 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 includes a heat-conducting component (8). The heat-conducting component (8) is connected between the NTC thermistor (3) and the brass shell (5) to guide heat.

4. The NTC temperature sensor according to claim 3, characterized in that, The thermal conductive component (8) is made of thermal grease, and the encapsulation component (7) is made of epoxy resin.

5. A component suitable for the NTC temperature sensor of claim 4, characterized in that, Includes a mounting base (10) connected to the plastic housing (1) and the brass housing (5); A stainless steel retaining ring (11) is connected to the mounting base (10) to fix the mounting base (10) and the plastic shell (1).

Images