Injection-molding-based sensor fastener, sensor, and injection molding method

Abstract

The present invention discloses a sensor with a fastener and an injection molding method, wherein the fastener includes a base, a ceramic plate, and an injection molded part; the upper end surface of the base is provided with a base cavity, and the lower end surface of the base is provided with a base through-hole that penetrates the base cavity; the end of the base through-hole close to the base cavity is provided with a partition plate extending axially of the base through-hole; two injection molding holes are provided on the partition plate; the upper end surface of the ceramic plate abuts against the side surface of the partition plate facing away from the base cavity; the ceramic plate is provided with ceramic plate through-holes at positions opposite to the injection molding holes; the injection molded part includes an upper injection molding plate and a lower injection molding plate that penetrate the two injection molding holes for connection, the upper injection molding plate is distributed in the base cavity, and the lower injection molding plate is distributed in the base through-hole. The above-mentioned fastener is squeezed by the two sides of the partition plate and the ceramic plate to ensure that it will not loosen due to temperature changes, thereby improving the reliability of the stable connection between the ceramic plate and the base.

Description

Technical Field

[0001] The present invention relates to the technical field of sensors, and in particular to a sensor fastener based on injection molding, a sensor, and an injection molding method. Background Art

[0002] In order to conduct subtle deformations, high-precision sensors have an oil chamber between the diaphragm and the sensing device. The deformation of the diaphragm is conducted to the sensing device through the oil chamber, so that the sensing device senses the deformation and generates a sensing signal. Since the vibration deformation needs to be conducted to the sensing chip on the ceramic plate through the oil in the oil chamber, it is necessary to ensure that the oil chamber has a high degree of sealing. However, the existing technology usually uses a fixing component to fix and press the ceramic plate and the base to achieve sealing of the oil chamber. However, this sealing method will loosen the fixing component due to temperature changes during application, thereby affecting the sealing of the oil chamber, resulting in inaccurate sensing signals obtained by the sensing chip in the sensor, and even causing the sensor to fail and unable to work, affecting the reliability of the sensor during use. Therefore, the sensor structure in the existing technology has the problem of poor oil chamber sealing. Summary of the Invention

[0003] The present invention provides a sensor fastener based on injection molding, a sensor and an injection molding method, which aim to solve the problem of poor oil cavity sealing in the sensor structure in the prior art.

[0004] In a first aspect, the present invention discloses a sensor fastener based on injection molding, the fastener comprising a base, a ceramic plate and an injection molded part;

[0005] The upper end surface of the base is provided with a base cavity, and the lower end surface of the base is provided with a base through hole that penetrates the base cavity; an end of the base through hole close to the base cavity is provided with a partition plate extending in the axial direction of the base through hole; the partition plate is provided with two injection holes;

[0006] The upper end surface of the ceramic plate is in contact with the side of the partition plate facing away from the base cavity; the ceramic plate is provided with ceramic plate through holes at positions opposite to the injection holes; the injection molded part includes an upper injection molded plate and a lower injection molded plate and is connected through the two injection holes, the upper injection molded plate is distributed in the base cavity, and the lower injection molded plate is distributed in the base through holes.

[0007] In a second aspect, the present invention discloses a sensor, wherein the sensor comprises the fastener according to the first aspect, and further comprises a film;

[0008] An L-shaped concave platform is provided on the outer side wall of the base, a connecting ring is provided on the outer side wall of the film, and the height of the connecting ring extending towards the L-shaped concave platform is greater than the depth of the L-shaped concave platform;

[0009] The connecting ring is assembled on the L-shaped concave platform so that the connecting ring is fixedly connected to the base; when the connecting ring is assembled on the L-shaped concave platform, there is a gap between the film and the upper end surface of the base and the upper end surface of the injection molded part; the gap is communicated with the cavity above the ceramic plate to form a T-shaped oil cavity, and oil is injected into the T-shaped oil cavity;

[0010] An oil injection through hole communicating with the through hole of the base is provided on the ceramic plate; a sealed metal ball is provided at the opening of the oil injection through hole.

[0011] In a third aspect, the present invention also discloses an injection molding method, wherein the injection molding method is used for manufacturing the sensor as described in the second aspect above, and the injection molding method includes:

[0012] The ceramic plate is fixedly assembled in the through hole of the base and placed in a mold to clamp and fix the ceramic plate and the base through the mold;

[0013] High-temperature liquid injection molding agent is injected into one of the injection holes from the opening of the through hole of the base, and the excess liquid injection molding agent is refluxed through the other injection hole to complete the filling of the liquid injection molding agent;

[0014] The high-temperature liquid injection molding agent is cooled and solidified to form the injection molded part;

[0015] The diaphragm is press-fitted and assembled on the L-shaped concave platform of the base, and the connecting ring and the L-shaped concave platform are welded and fixed;

[0016] After injecting oil into the T-shaped oil cavity through the oil injection through hole on the ceramic plate, molten metal balls are used to fill the opening of the oil injection through hole to form sealed metal balls.

[0017] The present invention discloses a sensor with a fastener and an injection molding method, wherein the fastener includes a base, a ceramic plate, and an injection molded part; the upper end surface of the base is provided with a base cavity, and the lower end surface of the base is provided with a base through-hole that penetrates the base cavity; the end of the base through-hole close to the base cavity is provided with a partition plate extending axially of the base through-hole; two injection molding holes are provided on the partition plate; the upper end surface of the ceramic plate abuts against the side surface of the partition plate facing away from the base cavity; the ceramic plate is provided with ceramic plate through-holes at positions opposite to the injection molding holes; the injection molded part includes an upper injection molding plate and a lower injection molding plate that penetrate the two injection molding holes for connection, the upper injection molding plate is distributed in the base cavity, and the lower injection molding plate is distributed in the base through-hole. The above-mentioned fastener is squeezed by the two sides of the partition plate and the ceramic plate to ensure that it will not loosen due to temperature changes, thereby improving the reliability of the stable connection between the ceramic plate and the base, thereby greatly improving the reliability of the sensor using the fastener. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 An overall structural diagram of a sensor provided by an embodiment of the present invention;

[0020] Figure 2 Another overall structural diagram of the sensor provided by an embodiment of the present invention;

[0021] Figure 3 A cross-sectional structural diagram of a sensor provided by an embodiment of the present invention;

[0022] Figure 4 An exploded structural diagram of a sensor provided by an embodiment of the present invention;

[0023] Figure 5 A flow chart of the injection molding method provided by an embodiment of the present invention.

[0024] Figure numbers: 1. Base; 2. Ceramic plate; 4. Injection molded part; 11. Spacer; 12. Base cavity; 13. Base through hole; 131. Side groove; 41. Upper injection molded plate; 42. Lower injection molded plate; 22. Ceramic plate protrusion; 3. Film; 31. Connecting ring; 32. T-shaped oil chamber; 21. Ceramic plate through hole; 23. Oil injection through hole; 111. Injection molding hole; 24. Sealing metal ball; 33. Film convex ring; 14. Base flange; 15. Airtight side; 25. Flexible sealing gasket. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] It should be understood that when used in this specification and the appended claims, the terms "comprises" and "comprising" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0027] It should also be understood that the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0028] It should be further understood that the term "and / or" used in the specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0029] The above are only the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

[0030] The present invention discloses a fastener, such as Figure 3As shown in the figure, the fastener includes a base 1, a ceramic plate 2, and an injection molded part 4. An upper end face of the base 1 is provided with a base cavity 12, and a lower end face of the base 1 is provided with a base through hole 13 that communicates with the base cavity 12. One end of the base through hole 13 close to the base cavity 12 is provided with a spacer 11 extending in the axial direction of the base through hole 13. Two injection holes 111 are provided on the spacer 11. An upper end face of the ceramic plate 2 abuts against a side face of the spacer 11 facing away from the base cavity 12. Ceramic plate through holes 21 are respectively provided at positions of the ceramic plate 2 corresponding to the injection holes 111. The injection molded part 4 includes an upper injection molded plate 41 and a lower injection molded plate 42 and is connected through the two injection holes 111. The upper injection molded plate 41 is distributed in the base cavity 12, and the lower injection molded plate 42 is distributed in the base through hole 13.

[0031] Specifically, the fastener is mainly composed of a base 1, a ceramic plate 2, and an injection molded part 4. An upper end face of the base 1 is provided with a base cavity 12, and a lower end face of the base 1 is provided with a base through hole 13 that communicates with the base cavity 12. The inner diameter of the base cavity 12 can be greater than, less than, or equal to the inner diameter of the base through hole 13. A spacer 11 is provided in the base through hole 13, and two injection holes 111 are provided on the spacer 11. Two ceramic plate through holes 21 corresponding to the two injection holes 111 are provided on the ceramic plate 2, and each ceramic plate through hole 21 in the ceramic plate 2 is respectively communicated with a corresponding injection hole 111. The injection molded part 4 is obtained by heating and sintering a liquid injection molding agent. The injection molded part 4 is an integral structure, which includes an upper injection molded plate 41 and a lower injection molded plate 42. The upper injection molded plate 41 and the lower injection molded plate 42 are connected through the two injection holes 111. The specific structure is as Figure 3 shown. The upper injection molded plate 41 is distributed in the base cavity 12, and the lower injection molded plate 42 is distributed in the base through hole 13. Through holes are provided at the centers of both the upper injection molded plate 41 and the lower injection molded plate 42.

[0032] In a more specific embodiment, an outer chamfer is provided at one end of the ceramic plate 2 facing the spacer 11. Specifically, an upper end face of the upper injection molded plate 41 is flush with an upper end face of the base 1.

[0033] To improve the convenience of assembling the ceramic plate 2, an outer chamfer can be provided at one end of the ceramic plate 2 facing the spacer 11. When the ceramic plate 2 is assembled into the base through hole 13, the ceramic plate 2 can smoothly slide into the base through hole 13 along the direction of the outer chamfer to achieve tight assembly. Further, it can be set that an upper end face of the upper injection molded layer is flush with an upper end face of the base 1. This setting structure can make the thickness of the upper part of the oil cavity uniform, ensure that the oil cavity can evenly conduct vibration deformation, and improve the induction accuracy of the sensor.

[0034] In a more specific embodiment, the upper injection molded plate 41 is disposed to wrap around the top surface and inner sidewall of the partition plate 11. A flexible sealing gasket 25 is disposed between the ceramic plate 2 and the side surface of the partition plate 11.

[0035] Specifically, an upper injection molding plate 41 may be provided to wrap the top surface and inner side wall of the partition plate 11. The specific structure is as follows: Figure 3 As shown, the semi-enclosed structure thus formed can make the injection molded part 4 more tightly wrapped around the upper layer of the partition plate 11, thereby improving the stability of the connection between the ceramic plate 2 and the base 1 through the injection molded part 4. Furthermore, in order to improve the sealing performance of the connection between the ceramic plate 2 and the side of the partition plate 11, a flexible sealing gasket 25 can be set between the ceramic plate 2 and the side of the partition plate 11. In the process of obtaining the injection molded part 4 by injection molding and sintering, an external pressing force is used to press the ceramic plate 2 and the partition plate 11 from both sides. The gap between the sides of the ceramic plate 2 and the partition plate 11 can be sealed by squeezing the flexible sealing gasket 25, thereby improving the sealing performance between the ceramic plate 2 and the side of the detection plate. Among them, a flat annular sealing gasket with a rectangular cross-section can be provided, which can further improve the sealing performance compared to an annular sealing ring with a circular or elliptical cross-section.

[0036] In a more specific embodiment, a side groove 131 is provided on one side of the base through hole 13 ; and a ceramic plate protrusion 22 adapted to the side groove 131 is provided on the ceramic plate 2 .

[0037] The ceramic plate 2 is provided with a sensor component, which is mainly composed of a sensor chip and connecting leads. When the ceramic plate 2 is matched with the base 1, in order to improve the tightness of the assembly, a side groove 131 can be provided on one side of the base through hole 13. The specific setting structure is as follows: Figure 4 As shown; at the same time, a ceramic plate protrusion 22 is provided on the ceramic plate 2, which is compatible with the side groove 131. This arrangement allows the ceramic plate 2 to be more tightly and securely assembled within the base through-hole 13 of the base 1, preventing the ceramic plate 2 from rotating and shifting during assembly and crimping by the injection molded part 4. It also allows the ceramic plate 2 to be positioned during assembly by the fit between the ceramic plate protrusion 22 and the side groove 131. Even if the ceramic plate 2 is rotated to the appropriate orientation and assembled within the base through-hole 13, this method ensures that each ceramic plate 2 is rotated to the same angle and assembled within the base 1, improving the consistency of the orientation of the components on the ceramic plate 2 (including the sensor chip and connecting leads). By determining the angle between the orientation of different components (especially the connecting leads) and the side groove 131, the type of component on the ceramic plate 2 can be quickly distinguished, thereby improving the efficiency and accuracy of ceramic plate 2 assembly.

[0038] The embodiment of the present invention also discloses a sensor, such asFigures 1 to 4 As shown, the sensor includes a fastener as described in the above embodiments. The sensor further includes a thin film 3. An L-shaped concave platform is provided on the outer sidewall of the base 1. A connecting ring 31 is provided on the outer sidewall of the thin film 3. The height of the connecting ring 31 extending towards the L-shaped concave platform is greater than the depth of the L-shaped concave platform. The connecting ring 31 is assembled on the L-shaped concave platform so that the connecting ring 31 is fixedly connected to the base 1. When the connecting ring 31 is assembled on the L-shaped concave platform, there is a gap between the thin film 3 and the upper end surface of the base 1 and the upper end surface of the injection molded part 4. The gap communicates with the cavity above the ceramic plate 2 to form a T-shaped oil cavity 32, and oil is injected into the T-shaped oil cavity 32. An oil injection through hole 23 communicating with the through hole 13 of the base is provided on the ceramic plate 2. A sealing metal ball 24 is provided at the opening of the oil injection through hole 23.

[0039] By pressing the connecting ring 31 onto the base 1, the inner sidewall of the connecting ring 31 abuts against the L-shaped concave platform, and the connecting ring 31 and the base 1 can be fixedly welded by welding. There are gaps between the thin film 3 and the upper end surface of the base 1 and the upper end surface of the injection molded part 4, and the gaps communicate with the cavity above the ceramic plate 2 to form a T-shaped oil cavity 32. The specific structure is as Figure 3 shown. The opening of the oil injection through hole 23 on the ceramic plate 2 is sealed by the sealing metal ball 24, so as to seal the T-shaped oil cavity 32, and oil is injected into the T-shaped oil cavity 32. Among them, the connecting ring 31 and the thin film 3 can be obtained by integrally molding, and the connecting ring 31 and the thin film 3 can be made of aluminum alloy material. The base 1 can also be made of aluminum alloy material.

[0040] In a more specific embodiment, a thin film convex ring 33 is further provided on the outer sidewall of the thin film 3. The extending direction of the thin film convex ring 33 is opposite to the extending direction of the connecting ring 31, and the height of the thin film convex ring 33 is less than the height of the connecting ring 31.

[0041] To improve the tensile resistance of the thin film 3, a thin film convex ring 33 can be provided on the outer end face of the thin film 3. The extending direction of the thin film convex ring 33 is opposite to the extending direction of the connecting ring 31. The specific structure is as Figures 1 to 3 shown. Among them, the inner diameter of the thin film convex ring 33 can be set to be equal to the inner diameter of the connecting ring 31, and the outer diameter of the thin film convex ring 33 can be set to be equal to the outer diameter of the connecting ring 31. Since the thin film convex ring 33 does not need to be correspondingly set according to the depth of the L-shaped concave platform, the height of the thin film convex ring 33 can be set to be less than the height of the connecting ring 31. The connecting ring 31, the thin film 3 and the thin film convex ring 33 can be obtained by integrally molding.

[0042] In a specific embodiment, the height of the thin film convex ring 33 can be set to be 0.12 - 0.4 times the height of the connecting ring 31.

[0043] Specifically, a base flange 14 is further provided on the outer side wall of the base 1; a clearance side 15 is formed by vertically cutting one side of the base flange 14; the clearance side 15 and the side groove 131 of the base through hole 13 are arranged on the same side.

[0044] Specifically, to improve the stability of the sensor assembly, a base flange 14 can be provided on the outer side wall of the base 1. The base flange 14 is flush with the bottom surface of the base 1. The specific setting structure is as Figures 1 to 3 shown. Further, to improve the accuracy of positioning the connecting leads on the ceramic plate 2 in the sensor, a clearance side 15 can be provided on one side of the base flange 14. The specific setting structure of the clearance side 15 is as Figure 2 shown. The clearance side 15 and the side groove 131 of the base through hole 13 are arranged on the same side, that is, the protruding direction of the side groove 131 is directly opposite to the clearance side 15. Then, the orientation of the side groove 131 can be accurately determined through the position of the clearance side 15.

[0045] An embodiment of the present invention also discloses an injection molding method, which is used to manufacture the sensor as described in the above embodiment, as Figure 5 shown. The injection molding method specifically includes steps S110 to S150.

[0046] S110. Fix the ceramic plate in the base through hole and place it in the mold to clamp and fix the ceramic plate and the base through the mold.

[0047] The ceramic plate can be fixedly assembled in the base through hole. At this time, the upper end surface of the ceramic plate abuts against the bottom surface of the spacer in the base through hole. The assembled component can be placed in the mold, and a pressing force is applied to the lower end surface of the ceramic plate and the top surface of the spacer respectively through the mold to clamp and fix the ceramic plate and the base.

[0048] S120. Inject high-temperature liquid injection molding agent into one of the injection holes from the opening of the base through hole and reflux the excess liquid injection molding agent through the other injection hole to complete the filling of the liquid injection molding agent.

[0049] S130. After the high-temperature liquid injection molding agent is cooled and solidified, the injection molded part is formed.

[0050] Further, the injection molded part can be formed by injection molding to fixedly connect the ceramic plate and the base. The specific structure is as Figure 3As shown, there are two ceramic plate through-holes provided on the ceramic plate. A spacer plate is provided in the base through-hole, and two injection holes corresponding to the ceramic plate through-holes are provided on the spacer plate. Each ceramic plate through-hole in the ceramic plate is respectively communicated with a corresponding injection hole. Then, a flowable liquid injection agent (heating the injection agent to make it liquefy) is input through one ceramic plate through-hole of the ceramic plate, and the other ceramic plate through-hole is used to reflux the excess liquid injection agent when the base cavity is filled with the liquid injection agent. After the filling of the liquid injection agent is completed, the assembly is placed in a normal temperature environment for cooling. After the high-temperature liquid injection agent cools, the injection part can be formed. Then, the obtained injection part is formed by heating and curing the injection agent. The injection part includes an upper injection plate and a lower injection plate and is connected through the two injection holes. The upper injection plate is distributed in the base cavity, and the lower injection plate is distributed in the base through-hole.

[0051] S140. Press-fit and assemble the diaphragm on the L-shaped concave platform of the base, and weld and fix the connecting ring and the L-shaped concave platform.

[0052] Press-fit and assemble the thin film on the L-shaped concave platform. Then, the inner side wall of the connecting ring abuts against the side surface of the L-shaped concave platform. After that, the connecting ring and the L-shaped concave platform can be welded and fixed by thermal welding. The welding operation is laser welding, and the welding temperature is 700°C to 1000°C.

[0053] S150. After injecting oil into the T-shaped oil cavity through the oil injection through-hole on the ceramic plate, use a molten metal ball to fill the opening of the oil injection through-hole to form a sealed metal ball.

[0054] After the fixed assembly of the thin film is completed, oil can be injected into the T-shaped oil cavity through the oil injection through-hole. Then, use a molten metal ball to fill the opening of the oil injection through-hole. After the molten metal ball cools, it forms a sealed metal ball, and the opening of the oil injection through-hole is tightly sealed. Among them, the metal ball can be a tin ball or a metal ball prepared from other metals that are solid at normal temperature.

[0055] The present invention discloses a sensor with a fastener and an injection molding method, wherein the fastener includes a base, a ceramic plate, and an injection molded part; the upper end surface of the base is provided with a base cavity, and the lower end surface of the base is provided with a base through-hole that penetrates the base cavity; the end of the base through-hole close to the base cavity is provided with a partition plate extending axially of the base through-hole; two injection molding holes are provided on the partition plate; the upper end surface of the ceramic plate abuts against the side surface of the partition plate facing away from the base cavity; the ceramic plate is provided with ceramic plate through-holes at positions opposite to the injection molding holes; the injection molded part includes an upper injection molding plate and a lower injection molding plate that penetrate the two injection molding holes for connection, the upper injection molding plate is distributed in the base cavity, and the lower injection molding plate is distributed in the base through-hole. The above-mentioned fastener is squeezed by the two sides of the partition plate and the ceramic plate to ensure that it will not loosen due to temperature changes, thereby improving the reliability of the stable connection between the ceramic plate and the base, thereby greatly improving the reliability of the sensor using the fastener.

[0056] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present application, and such modifications or substitutions should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A sensor fastener based on injection molding, characterized in that, The fastener includes a base, a ceramic plate and an injection molded part; The upper end surface of the base is provided with a base cavity, and the lower end surface of the base is provided with a base through hole that penetrates the base cavity; an end of the base through hole close to the base cavity is provided with a partition plate extending in the axial direction of the base through hole; the partition plate is provided with two injection holes; The upper end surface of the ceramic plate is in contact with the side of the partition plate facing away from the base cavity; the ceramic plate is provided with ceramic plate through holes at positions opposite to the injection holes; the injection molded part includes an upper injection molded plate and a lower injection molded plate and is connected through the two injection holes, the upper injection molded plate is distributed in the base cavity, and the lower injection molded plate is distributed in the base through holes.

2. The sensor fastener based on injection molding according to claim 1, characterized in that, An outer cut corner is provided on one end of the ceramic plate facing the spacer plate.

3. The sensor fastener based on injection molding according to claim 1 or 2, characterized in that, The upper end surface of the upper injection-molded plate is flush with the upper end surface of the base.

4. The sensor fastener based on injection molding according to claim 3, wherein, The upper injection-molded plate is arranged to wrap the top surface and inner side wall of the partition plate.

5. The sensor fastener based on injection molding according to claim 3, wherein, A flexible sealing gasket is provided between the ceramic plate and the side surface of the spacer plate.

6. The sensor fastener based on injection molding according to claim 3, wherein A side groove is provided on one side of the base through hole; The ceramic plate is provided with a ceramic plate protrusion which is matched with the side groove.

7. A sensor, characterized in that, The sensor comprises the fastener according to any one of claims 1 to 6, and the sensor further comprises a film; An L-shaped concave platform is provided on the outer wall of the base, and a connecting ring is provided on the outer wall of the film, wherein the height of the connecting ring extending toward the L-shaped concave platform is greater than the depth of the L-shaped concave platform; The connecting ring is assembled on the L-shaped concave platform so as to be fixedly connected to the base; when the connecting ring is assembled on the L-shaped concave platform, a gap is formed between the film and the upper end surface of the base and the upper end surface of the injection molded part; the gap is connected to the cavity above the ceramic plate to form a T-shaped oil cavity, and oil is injected into the T-shaped oil cavity; An oil injection through hole connected to the base through hole is provided on the ceramic plate; a sealing metal ball is provided at the opening of the oil injection through hole.

8. The sensor according to claim 7, wherein The outer side wall of the film is further provided with a film convex ring, the extension direction of the film convex ring is opposite to the extension direction of the connecting ring, and the height of the film convex ring is smaller than the height of the connecting ring.

9. The sensor according to claim 7, wherein The outer side wall of the base is further provided with a base flange; one side of the base flange is vertically cut to form an air-avoiding side edge.

10. An injection molding method, which is used to manufacture the sensor according to any one of claims 7-9, characterized in that, The injection molding method comprises: The ceramic plate is fixedly assembled in the through hole of the base and placed in a mold, so that the ceramic plate and the base are clamped and fixed by the mold; Injecting high-temperature liquid injection molding agent into one of the injection holes through the opening of the base through hole and refluxing excess liquid injection molding agent through the other injection hole to complete the filling of the liquid injection molding agent; The high-temperature liquid injection molding agent is cooled and solidified to form the injection molded part; Pressing and assembling the film onto the L-shaped concave platform of the base, and welding and fixing the connecting ring to the L-shaped concave platform; After oil is injected into the T-shaped oil cavity through the oil injection through hole on the ceramic plate, a molten metal ball is used to fill the opening of the oil injection through hole to form a sealing metal ball.

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