A temperature and pressure sensor coated with a thermistor

Abstract

The utility model discloses a kind of temperature and pressure sensors of cladding thermistor, including electrical terminal and the NTC component being axially connected with electrical terminal, there is the ceramic core body and flexible circuit board being connected between electrical terminal and NTC component, electrical terminal includes electrical terminal injection molding body, at least one electrical terminal interior injection molding body being set in the inside of electrical terminal injection molding body and PIN needle being connected with flexible circuit board from electrical terminal injection molding body and electrical terminal interior injection molding body, NTC component includes NTC component interior injection molding body and embeddingly set inside connection insert, one end of connection insert is connected with flexible circuit board, the second end of connection insert is connected with thermistor being wrapped in the end of NTC component interior injection molding body, NTC component interior injection molding body outside is covered with outside injection molding body. The utility model can solve the problem that the existing technical scheme has complex design structure and assembly process, many parts, difficult sensor sealing design and heat conduction design.

Description

Technical Field

[0001] This utility model relates to the field of temperature and pressure sensor technology, specifically a temperature and pressure sensor with a thermistor coated on it. Background Technology

[0002] Currently, most mainstream temperature and pressure sensors use thermistors (NTCs) to sense the temperature of the medium. The resistance of an NTC decreases as the temperature increases. To prevent metal debris from entering the sensor and causing a short circuit in the NTC, most manufacturers now protect the NTC with a metal sleeve to isolate it from external interference. A thermally conductive adhesive with a high thermal conductivity is applied inside the metal sleeve to ensure response time. A sealing ring is also used between the NTC component and the metal sleeve for protection.

[0003] However, the above-mentioned existing technical solutions have the following shortcomings:

[0004] 1. The NTC component manufacturing process is complex: NTC pins are soldered to metal pins or metal inserts → injection molding (complex molds) → installation of sheath sealing rings → dispensing of adhesive into the metal sheath in a vacuum environment → assembly and riveting. In this process, the sealing installation and dispensing process of the metal sheath are quite difficult.

[0005] 2. Requires a lot of investment in equipment: resistance welding equipment, dispensing machine, negative pressure environment chamber, vision camera, etc.

[0006] 3. Because the temperature sensing of NTC requires the temperature to be transferred through thermally conductive adhesive and metal sheath, the response time of the sensor becomes longer.

[0007] 4. Due to the variety of electrical terminals, different electronic terminals require different FPCs (flexible printed circuit boards), which leads to increased production costs and difficulties in material control.

[0008] In summary, existing technical solutions suffer from complex design structures and assembly processes, numerous parts, and significant challenges in sensor sealing and thermal design. They also face stringent requirements regarding the dispensing environment, dispensing speed, and nozzle movement speed, resulting in low assembly efficiency, high component costs, and the inability to standardize FPCs for different electrical terminal types. Therefore, a novel temperature and pressure sensor employing a new structure and process is urgently needed to address these issues. Utility Model Content

[0009] This invention provides a temperature and pressure sensor with a thermistor coating, which can solve the problems of complex design structure and assembly process, large number of parts, difficult sensor sealing and heat conduction design, stringent requirements for dispensing environment, dispensing speed and dispensing head movement speed, low assembly efficiency and high part cost in existing technical solutions, as well as the inability to unify FPC for different types of electrical terminals.

[0010] To achieve the above objectives, this utility model provides a temperature and pressure sensor with a thermistor, including electrical terminals and an NTC assembly axially connected to the electrical terminals. A flexible circuit board and a ceramic core are connected between the electrical terminals and the NTC assembly. The electrical terminals include an electrical terminal injection molded body, at least one electrical terminal internal injection molded body disposed inside the electrical terminal injection molded body, and a PIN pin passing through the electrical terminal injection molded body and the electrical terminal internal injection molded body and connected to the flexible circuit board. The NTC assembly includes an NTC assembly internal injection molded body and a connecting insert embedded inside the NTC assembly internal injection molded body. One end of the connecting insert is connected to the flexible circuit board, and the second end of the connecting insert is connected to the thermistor wrapped around the end of the NTC assembly internal injection molded body. The outer side of the NTC assembly internal injection molded body is covered with... The circuit board is covered with an external injection molded body, and a base is installed on the outside of the external injection molded body. Both the electrical terminals and the NTC component have a secondary injection molding structure. In the NTC component, the connecting insert and the thermistor are covered by the internal injection molded body of the NTC component, ensuring that the welding positions of the two are not exposed. The combination of the external injection molded body and the internal injection molded body of the NTC component forms a reliable structure, eliminating the need for traditional thermally conductive adhesive and dispensing processes. This allows the thermistor to quickly sense the external temperature through the external injection molded body and the internal injection molded body of the NTC component, without the problem of long response time. The electrical terminals can first position the pins through the internal injection molded body of the electrical terminals, and then perform secondary injection molding. Through the structural design of the internal injection molded body and the pins of the electrical terminals, different models of electrical terminals can be matched with a unified flexible circuit board.

[0011] Preferably, the internal injection molded body of the NTC component includes a disk body and a detection extension portion extending axially on one side of the disk body, the thermistor is disposed at the end of the detection extension portion, and the shape of the external injection molded body matches the shape of the internal injection molded body of the NTC component.

[0012] Preferably, the disc body is provided with multiple recesses, which are fitted into the outer injection molded body. The recesses can improve the bonding strength between the disc body and the outer injection molded body.

[0013] Preferably, the main body of the disc is provided with at least one vent hole in the middle, and the outer injection molded body is provided with a through hole corresponding to the vent hole, so as to ensure that the ceramic core can sense the external refrigerant pressure.

[0014] Preferably, the upper surface of the disc body is provided with a plurality of positioning posts around the edge. The positioning posts are inserted into the outer injection molded body for assembly. The positioning posts are beneficial for positioning when the outer injection molded body is subjected to secondary injection molding.

[0015] And / or, a positioning block is provided around the circumference of the disc body. The positioning block is embedded in the outer injection molded body and its side is exposed on the side wall of the outer injection molded body. The positioning block can improve the bonding strength between the disc body and the outer injection molded body, and can also be positioned when the outer injection molded body is being injected.

[0016] Preferably, the PIN pins are straight or bent, and the end of the PIN pins connected to the flexible circuit board is arranged in a line. This ensures that the PIN pins of different electrical terminals can be adapted to a unified flexible circuit board, reducing costs.

[0017] Preferably, the upper two side walls of the outer injection molded body are provided with snap-fit ​​seats, and the two sides of the snap-fit ​​seats are provided with snap-fit ​​grooves. The electrical terminals are provided with claws that extend to the sides of the snap-fit ​​seats and enter into the snap-fit ​​grooves to snap with the snap-fit ​​seats. This can realize the rapid assembly between the electrical terminals and the NTC components. Compared with the conventional snap-fit ​​structure, the claws have a guiding effect during the snap-fit ​​process.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] A new assembly structure is adopted, with both electrical terminals and NTC components featuring secondary injection molding. Within the NTC component, the connecting insert and thermistor are encapsulated by an internal injection molded body, ensuring that the solder joints are not exposed and guaranteeing bonding strength. The combination of the external injection molded body and the internal injection molded body of the NTC component forms a reliable structure, eliminating the need for traditional thermally conductive adhesives and dispensing processes. This allows the thermistor to quickly sense external temperatures through both the external and internal injection molded bodies, avoiding long response times. For electrical terminals, the PIN pins are pre-positioned using the internal injection molded body before secondary injection molding. This structural design of the internal injection molded body and PIN pins allows for the use of a unified flexible circuit board for different types of electrical terminals. Attached Figure Description

[0020] Figure 1 This is a three-dimensional exploded view of the present invention;

[0021] Figure 2 This is a front sectional view of the electrical terminals and NTC assembly of this utility model;

[0022] Figure 3 This is a three-dimensional exploded view of the NTC component of this utility model;

[0023] Figure 4 This is a structural diagram of the connecting insert and the strip of this utility model.

[0024] Figure 5 This is a schematic diagram of the welding of the connecting insert and the thermistor of this utility model;

[0025] Figure 6 This is a schematic diagram of the injection molding process of the internal injection molded body of the NTC component of this utility model.

[0026] Figure 7 This is a three-dimensional schematic diagram of the injection molding process of the internal injection body of the NTC component of this utility model;

[0027] Figure 8 This is a schematic diagram of the first molding method for the internal injection molded body and PIN pin of the electrical terminal of this utility model;

[0028] Figure 9 This is a schematic diagram of a second molding method for the internal injection molded body and PIN pin of the electrical terminal of this utility model;

[0029] Figure 10 This is a three-dimensional structural diagram of the PIN pin and sealing material layer in another embodiment of the present invention;

[0030] Figure 11 This is a perspective view of the PIN pin in another embodiment of the present invention;

[0031] Figure 12 This is a partial cross-sectional view of the PIN pin and sealing material layer in another embodiment of the present invention;

[0032] Figure 13 This is a side cross-sectional view of the PIN pin and sealing material layer in another embodiment of the present invention;

[0033] Figure 14 This is a structural diagram of the connecting insert in another embodiment of the present invention.

[0034] Figure label:

[0035] 1. Electrical terminal; 11. Electrical terminal injection body; 12. PIN pin; 13. Internal injection body of electrical terminal; 2. Flexible circuit board; 20. Sealing material layer; 3. Ceramic core; 4. NTC component; 41. External injection body; 412. Snap-on seat; 413. Snap-on groove; 42. Internal injection body of NTC component; 421. Disc body; 422. Recessed part; 423. Detection extension part; 424. Cutting groove; 425. Positioning block; 426. Positioning post; 427. Vent hole; 43. Thermistor; 44. Connecting insert; 5. Base; 6. Strip material; 61. Positioning hole; 100. First sealing part; 110. Serrated protrusion structure; 120. Concave-convex structure; 121. Spherical inner groove; 122. Spherical protrusion; 200. Second sealing part. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0037] like Figure 1-9 As shown, this utility model addresses the problems of complex design structures and assembly processes, numerous parts, and difficulties in sensor sealing and thermal design in existing technical solutions; stringent requirements for dispensing environment, dispensing speed, and nozzle movement speed, resulting in low assembly efficiency and high part costs; and the inability to standardize FPCs for different types of electrical terminals. The present invention provides the following technical solution: a temperature and pressure sensor with a thermistor coating, comprising an electrical terminal 1 and an NTC component 4 axially connected to the electrical terminal 1. A flexible circuit board 2 and a ceramic core 3 are connected between the electrical terminal 1 and the NTC component 4. The electrical terminal 1 includes an electrical terminal injection molded body 11 and a ceramic core 3 disposed on the electrical terminal injection molded body 11. The NTC assembly 4 includes an internal injection molded body 13 for electrical terminals inside the plastic body 11 and a PIN pin 12 passing through the internal injection molded body 11 and the internal injection molded body 13 and connected to the flexible circuit board 2. The NTC assembly 4 includes an internal injection molded body 42 for NTC assembly and a connecting insert 44 embedded inside the internal injection molded body 42. One end of the connecting insert 44 is connected to the flexible circuit board 2, and the second end of the connecting insert 44 is connected to a thermistor 43 wrapped around the end of the internal injection molded body 42 for NTC assembly. An external injection molded body 41 is provided to cover the outside of the internal injection molded body 42 for NTC assembly, and a base 5 is installed on the outside of the external injection molded body 41.

[0038] In this embodiment, both the electrical terminal 1 and the NTC component 4 have a secondary injection molding structure. The NTC component 4 encapsulates the connecting insert 44 and the thermistor 43 through the internal injection molding body 42, ensuring that the welding positions of the two are not exposed. The combination of the external injection molding body 41 and the internal injection molding body 42 of the NTC component forms a reliable structure, eliminating the need for traditional thermally conductive adhesive and dispensing processes. This allows the thermistor 43 to quickly sense the external temperature through the external injection molding body 41 and the internal injection molding body 42 of the NTC component, avoiding the problem of long response time. Specifically, the thermistor 43 forms a double-layer dense protection by the internal injection molding body 42 of the NTC component encapsulating the welding point and the secondary sealing of the external injection molding body. At the same time, the thermistor 43 only contacts the measured medium through two thin injection molding bodies, thus reducing the temperature response time.

[0039] The electrical terminal 1 can first position the PIN pin 12 through the internal injection molding body 13 of the electrical terminal, and then perform secondary injection molding. Through the structural design of the internal injection molding body 13 and the PIN pin 12 of the electrical terminal, different models of electrical terminals 1 can correspond to a unified flexible circuit board 2.

[0040] Specifically, the electrical terminal injection body 11, the internal electrical terminal injection body 13, the internal NTC component injection body 42, and the external injection body 41 are all made of PBT+30% glass fiber reinforced material; the PIN pin 12 and the connecting insert 44 are all made of brass; the flexible circuit board 2 is a polyimide PI substrate FPC with a copper foil thickness of 18μm and a solder resist layer covering the surface; and the ceramic core 3 is made of alumina ceramic.

[0041] In this embodiment, the NTC component internal injection molding body 42 includes a disk body 421 and a detection extension 423 extending axially on one side of the disk body 421. The thermistor 43 is disposed at the end of the detection extension 423. The shape of the external injection molding body 41 matches the shape of the NTC component internal injection molding body 42. Since the part of the connecting insert 44 covered in the detection extension 423 is still connected to the strip 6, a cutting groove 424 is provided on the side wall of the detection extension 423 at the position where it is connected to the strip 6 in order to achieve subsequent separation of the connecting insert 44 and the strip 6. At the same time, the cutting groove 424 is filled when the external injection molding body 41 is injection molded, which can strengthen the bonding strength between the external injection molding body 41 and the NTC component internal injection molding body 42.

[0042] In this embodiment, the disc body 421 is provided with multiple recesses 422, which are fitted into the outer injection molded body 41. The recesses 422 increase the contact area between the two injection molded bodies, achieving a bonding force of ≥50N and preventing separation due to long-term vibration. Simultaneously, the disc body 421 has at least one vent 427 in its center, and the outer injection molded body 41 has a corresponding through hole. The vent 427 directly connects the ceramic core 3 to the measured medium, ensuring unobstructed pressure transmission and a pressure response time ≤20ms.

[0043] In this embodiment, a plurality of positioning posts 426 are provided around the edge on the upper end surface of the disc body 421. The positioning posts 426 are inserted into the outer injection molded body 41 for engagement. The positioning posts 426 are beneficial for positioning the outer injection molded body 41 during secondary injection molding. Specifically, the positioning posts 426 are inserted into the guide sleeve of the outer injection molded body to ensure that the deviation of the inner injection molded body 42 of the NTC component is ≤0.03mm during secondary injection molding.

[0044] In addition, a positioning block 425 is provided around the circumference of the disc body 421. The positioning block 425 is embedded in the outer injection molded body 41 and its side is exposed on the side wall of the outer injection molded body 41. The positioning block 425 can improve the bonding strength between the disc body 421 and the outer injection molded body 41, and can also be positioned when the outer injection molded body 41 is being injection molded.

[0045] In this embodiment, the PIN pins 12 are straight or bent. The end of the PIN pin 12 connected to the flexible circuit board 2 is arranged in a straight line. This ensures that different PIN pins 12 can be adapted to a uniform flexible circuit board 2, reducing costs. For example, the two ends of a straight PIN pin 12 are in the same position, i.e., they are all arranged in a straight line; while with a bent PIN pin 12, the lower end of the PIN pin 12 is still arranged in a straight line, but the upper end can be designed to be staggered to correspond to different electrical connectors. Correspondingly, the internal injection molded body 13 of the electrical terminal can be set to 2 or 3, such as... Figure 9 As shown, the internal injection molded body 13 of the electrical terminal can be assembled to achieve the above-mentioned technical effects.

[0046] In this embodiment, the upper two side walls of the outer injection molded body 41 are provided with snap-fit ​​seats 412, and the two sides of the snap-fit ​​seats 412 are provided with snap-fit ​​grooves 413. The electrical terminal 1 is provided with claws 14 that extend to the sides of the snap-fit ​​seats 412 and enter into the snap-fit ​​grooves 413 to snap-fit ​​with the snap-fit ​​seats 412. This can realize the quick assembly between the electrical terminal 1 and the NTC component 4. Compared with the conventional snap-fit ​​structure, the claws 14 have a guiding effect during the snap-fit ​​process with the snap-fit ​​seats 412. Moreover, since the claws 14 are visible from the outside, it is convenient to use tools to deform them during disassembly.

[0047] In this embodiment, a manufacturing process for the above-mentioned temperature and pressure sensor with a thermistor coating is also provided. This manufacturing process eliminates the need for resistance welding equipment, dispensing machine, and negative pressure chamber, reducing equipment investment. The process includes the following steps:

[0048] (1) NTC Component 4 Manufacturing Process

[0049] S11: Strip stamping connecting insert

[0050] Material 6: Copper strip thickness 0.3mm, width 10mm, length 500mm, pre-punched positioning holes 61;

[0051] Punch press: Model J23-10, stamping pressure 5MPa, stamping speed 30 times / min, stamping 10-20 connecting inserts 44 in one stamping, connecting inserts 44 are connected to strip 6 through a "connecting bridge" with a width of 0.2mm to facilitate subsequent separation;

[0052] Inspection: The dimensions of the connecting inserts are inspected using a 2D imaging device.

[0053] S12: Thermistor Welding and Cold Solder Detection

[0054] Welding equipment: Semi-automatic soldering machine;

[0055] Welding process: The strip 6 is fixed to the fixture and positioned through the positioning hole 61. The robot or manual gripper picks up the thermistor 43 and aligns its pins with the end of the connecting insert 44 for welding.

[0056] Detection of cold solder joints: Use an AOI visual inspection instrument or a multimeter to test the resistance at both ends of the metal pins to identify cold solder joints and missing solder joints. Defective products are marked and rejected.

[0057] S13: One-time injection molding of the internal injection body of NTC components

[0058] The material 6 is placed into the injection mold for the first injection molding, and the internal injection body of the NTC component is formed. The internal injection body of the NTC component covers both the connecting insert and the thermistor.

[0059] After mold opening, remove the component consisting of the strip and the internal injection molded body 42 of the NTC component, trim the gate, and clean the surface impurities.

[0060] S14: Secondary injection molding of the outer injection body and separation of the strip material.

[0061] The "connecting bridge" between the connecting insert 44 and the strip 6 is broken by punching. The separated NTC component internal injection body component is put into the secondary injection mold for secondary injection molding. After injection molding, the external injection body 41 and the NTC component internal injection body 42 fit together without gap.

[0062] The sealing performance was tested using an airtightness tester at a pressure of 0.5 MPa for 10 seconds, with a leakage rate of ≤0.1 mL / min.

[0063] (2) Manufacturing process of electrical terminal 1

[0064] S21: PIN pin stamping

[0065] Material: Brass strip (H62), 0.8mm thick, 10mm wide;

[0066] Punch press: Model J23-16, stamping pressure 8MPa, stamping speed 20 times / min, 3 pins are formed in one stamping;

[0067] Surface treatment: PIN pin 12 is tin-plated after stamping to improve solderability.

[0068] S22: One-time injection molding of the internal injection body of electrical terminals

[0069] The PIN pins 12 are fixed in the mold and arranged in a line. The internal injection body 13 of the electrical terminal is injection molded. After injection molding, the internal injection body 13 of the electrical terminal and the PIN pins 12 are not loose.

[0070] S23: Secondary injection molding of electrical terminal injection body

[0071] The assembly of the internal injection body 13 of the electrical terminal and the PIN pin 12 is placed into the injection mold. After injection molding, the electrical terminal injection body 11 covers the internal injection body 13 of the electrical terminal, with only the two welding ends of the PIN pin 12 exposed.

[0072] (3) Final assembly process

[0073] The process includes welding of the flexible circuit board 2, bonding of the ceramic core 3, and snap-fit ​​assembly. During snap-fit ​​assembly, the claws 14 of the electrical terminal 1 are aligned with the snap-fit ​​seat 412 of the NTC component 4, and a 5N push force is applied to complete the snap-fit. Then, the base 5 is pressed into the outer injection molded body 41 using a press. Finally, the finished product is inspected, including appearance inspection, electrical performance testing, and environmental testing.

[0074] In the manufacturing process of NTC component 4, the strip 6 is used to position multiple connecting inserts 44, which facilitates the welding of the thermistor 43 and one-time injection molding. The overall production and assembly process is highly efficient, and the manufacturing processes of NTC component 4 and electrical terminal 1 can be carried out simultaneously. The overall assembly is also very fast, thus solving the problems of complex design structure and assembly process, large number of parts, difficult sensor sealing and heat conduction design, stringent requirements for dispensing environment, dispensing speed and glue head movement speed, low assembly efficiency and high part cost in the existing technical solutions.

[0075] To further improve the sealing between the PIN pin 12 and the internal injection molded body 13 of the electrical terminal, and between the connecting insert 44 and the internal injection molded body 42 of the NTC assembly, such as Figure 10-14 As shown, a first sealing part 100 is provided on the outer side of the PIN pin 12, and a second sealing part 200 is provided on the outer side of the connecting insert 44. Both the first sealing part 100 and the second sealing part 200 are wrapped with a sealing material layer 20. Therefore, by pre-embedding the sealing material layer 20 between the injection molded part and the insert, the interface pores existing in the interface or area of ​​the dissimilar materials are sealed, preventing the formation of medium penetration channels, slowing down the electrochemical corrosion rate, reducing the crack propagation caused by stress concentration, and reducing the occurrence of creep relaxation that weakens the sealing force. Moreover, it solves the technical problems existing in the exposed dispensing and coating methods in the prior art.

[0076] The sealing material layer 1 is formed by curing polymer adhesive. The organic elastomer after curing will penetrate into the air bubbles and other pores of the injection molding material to fill them, thus avoiding sealing failure caused by irregular air bubbles in the injection molded parts.

[0077] The surfaces of the first sealing part 100 and / or the second sealing part 200 are provided with concave and convex structures 120. By providing concave and convex structures 120, the contact area between the sealing part and the sealing material layer 20 can be increased, and the contact surface between the injection molded part and the sealing material layer 20 can also be increased, thereby improving the anti-permeability effect and bonding strength. In addition, at least one side of the first sealing part 100 and / or the second sealing part 200 is provided with a serrated protrusion structure 110. The serrated protrusion structure 110 can improve the sealing effect between the two sides of the first sealing part 100 and the second sealing part 200 and the sealing material layer 20. Depending on the width of the connecting insert 44 and the PIN pin 12, different numbers of concave and convex structures 120 can be selected. The concave and convex structures 120 can be protruding structures or concave structures, or both protruding and concave structures. Similarly, the serrated protrusion structure 110 can also be provided on both sides of the elongated connecting insert 44 and the PIN pin 12. The number of serrated protrusion structures 110 and concave and convex structures 120 can be determined according to the sealing material layer 1 and the area of ​​the injection molded part.

[0078] The aforementioned concave-convex structure 120 includes spherical inner grooves 121 and spherical protrusions 122 arranged alternately. The spherical inner grooves 121 and spherical protrusions 122 increase the contact area between the sealing part and the sealing material layer, preventing areas not covered by the sealing material layer. Simultaneously, the alternating arrangement of the spherical inner grooves 121 and spherical protrusions 122 increases the axial bonding strength between the sealing part and the sealing material layer. Furthermore, the alternating arrangement of the spherical inner grooves 121 and spherical protrusions 122 increases the contact area of ​​the sealing material layer 20 by 40% and improves the axial bonding strength by 25%. The curvature design of the spherical structure disperses the impact force during injection molding, reducing the bubble rate of the adhesive layer.

[0079] The manufacturing process of the first sealing part 100 and the second sealing part 200:

[0080] First, clean the surfaces of the connecting insert 44 and the PIN pin 12, and then air-dry them. After air-drying, perform plasma treatment. Then, apply or impregnate the first sealing part 100 and the second sealing part 200 with polymer adhesive. After the adhesive adheres to the surface, let it air-dry and / or bake. Repeat the above process, apply or impregnate the polymer adhesive again, and then let it air-dry and / or bake. The adhesive needs to be left dry for one day, during which time it must be kept clean and free from contamination.

[0081] After the polymer adhesive is applied, the connecting insert 44 and PIN pin 12 can be placed into the corresponding positions of the mold, and the internal injection body 13 of the electrical terminal and the internal injection body 42 of the NTC component are injection molded. After injection molding, a dense elastic material layer will be attached between the surface of the connecting insert 44 and PIN pin 12 and the injection molded part as a sealing material layer 20. The sealing material layer 20 tightly wraps the insert while squeezing the injection area. During injection molding, due to the high temperature on the mold, this organic elastic material will penetrate into the air bubbles and other pores of the injection resin material and fill them, thus avoiding sealing failure caused by irregular air bubbles in the injection molded part.

[0082] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0083] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly and specifically defined.

[0084] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0085] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

Claims

1. A temperature and pressure sensor with a thermistor covering, comprising an electrical terminal (1) and an NTC assembly (4) axially connected to the electrical terminal (1), wherein a flexible circuit board (2) and a ceramic core (3) are disposed between the electrical terminal (1) and the NTC assembly (4), characterized in that, The electrical terminal (1) includes an electrical terminal injection body (11), at least one electrical terminal internal injection body (13) disposed inside the electrical terminal injection body (11), and a PIN pin (12) passing through the electrical terminal injection body (11) and the electrical terminal internal injection body (13) and connected to the flexible circuit board (2). The NTC assembly (4) includes an NTC assembly internal injection body (42) and a connecting insert (44) embedded inside the NTC assembly internal injection body (42). One end of the connecting insert (44) is connected to the flexible circuit board (2), and the second end of the connecting insert (44) is connected to a thermistor (43) wrapped at the end of the NTC assembly internal injection body (42). An external injection body (41) is disposed on the outside of the NTC assembly internal injection body (42), and a base (5) is installed on the outside of the external injection body (41).

2. The temperature and pressure sensor with a thermistor coating according to claim 1, characterized in that: The NTC component internal injection body (42) includes a disk body (421) and a detection extension (423) that extends axially on one side of the disk body (421). The thermistor (43) is disposed at the end of the detection extension (423). The shape of the external injection body (41) matches the shape of the NTC component internal injection body (42).

3. The temperature and pressure sensor with a thermistor coating according to claim 1, characterized in that: The disc body (421) is provided with a plurality of recesses (422), which are fitted into the outer injection molded body (41).

4. The temperature and pressure sensor with a thermistor coating according to claim 3, characterized in that: The main body of the disc (421) is provided with at least one vent hole (427) in the middle, and the outer injection molded body (41) is provided with a through hole corresponding to the vent hole (427).

5. The temperature and pressure sensor with a thermistor coating according to claim 2, characterized in that: The upper surface of the disc body (421) is provided with a plurality of positioning posts (426) around the edge, and the positioning posts (426) are inserted into the outer injection molded body (41) for bonding. And / or, a positioning block (425) is provided around the circumference of the disc body (421), the positioning block (425) being embedded in the outer injection molded body (41) and having its side exposed on the side wall of the outer injection molded body (41).

6. The temperature and pressure sensor with a thermistor coating according to claim 1, characterized in that: The PIN pin (12) is straight or bent, and the end of the PIN pin (12) connected to the flexible circuit board (2) is arranged in a straight line.

7. The temperature and pressure sensor with a thermistor coating according to claim 1, characterized in that: The upper two side walls of the external injection molded body (41) are provided with snap-fit ​​seats (412), and snap-fit ​​grooves (413) are provided on both sides of the snap-fit ​​seats (412). The electrical terminal (1) is provided with claws (14) that extend to both sides of the snap-fit ​​seats (412) and enter into the snap-fit ​​grooves (413) to snap-fit ​​the snap-fit ​​seats (412).

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