CN219369015U - Oil charging pressure sensor - Google Patents
Oil charging pressure sensor Download PDFInfo
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- CN219369015U CN219369015U CN202223348612.9U CN202223348612U CN219369015U CN 219369015 U CN219369015 U CN 219369015U CN 202223348612 U CN202223348612 U CN 202223348612U CN 219369015 U CN219369015 U CN 219369015U
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- pressure
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- oil
- pressure sensor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Measuring Fluid Pressure (AREA)
Abstract
The utility model discloses an oil-filled pressure sensor, which comprises a shell, wherein a containing cavity is arranged in the shell, a baffle assembly, a pressure sensing core body and a printed circuit board are sequentially arranged in the containing cavity, and the bottom of the containing cavity is communicated with the outside through a first pressure guide hole; the pressure sensing core body comprises a base component, a sleeve, a diaphragm, a compression ring, silicone oil, a diffused silicon piezoresistive chip and a gold wire, wherein the base component comprises a base, and the base is sealed with a terminal through glass; the baffle assembly comprises a baffle and an elastic body arranged on the upper surface of the baffle, a second pressure guide hole is formed in the baffle, and the baffle assembly, the shell and the pressure sensing core form a cavity which is communicated with the second pressure guide hole. The utility model designs an oil-filled pressure sensor, which solves the problem that under the condition of low temperature, an external medium is frozen and expanded, and a pressure core body in the oil-filled pressure sensor is extruded and damaged by the external medium expanded into a solid state.
Description
Technical Field
The utility model relates to the technical field of pressure sensors, in particular to a hydraulic filling pressure sensor.
Background
Pressure sensors can be classified into oil-filled type and non-oil-filled type according to the pressure transmission medium. The oil-filled pressure sensor is a sensor which adopts oil liquid as a pressure transmission medium between a diaphragm and a sensing element. In the use process of the existing oil-filled pressure sensor, under the condition of low temperature, an external medium is frozen along with the temperature reduction, and meanwhile, the volume of the external medium expands. The inward squeezing when the external medium is frozen and expands to a solid state can cause the pressure core in the oil filled pressure sensor to be damaged by being compressed too high.
For example, patent CN207675354U discloses a MEMS oil filling pressure sensor for negative pressure measurement, which comprises a base, wherein a cavity for containing silicone oil is arranged on the base, a metal diaphragm for sensing external pressure is arranged on the upper side of the base, a sealed cavity is formed between the base and the metal diaphragm, a through hole is arranged on a bottom plate corresponding to the base and the metal diaphragm, a pressure chip is fixed on the lower surface of the bottom plate, a vent hole of the pressure chip is communicated with the through hole, the pressure chip is fixed on the bottom plate through sealing adhesive, and silicone oil is filled in the cavity, the through hole and the vent hole. The oil-filled pressure sensor of the patent is not provided with an anti-freezing structure, and under the condition of low temperature, an external medium is frozen and expanded, and a pressure core body in the oil-filled pressure sensor is extruded by the external medium expanded into a solid state to be damaged.
Disclosure of Invention
The technical problem to be solved by the utility model is to provide a charging pressure sensor aiming at the defects of the prior art.
In order to achieve the above purpose, the specific technical scheme of the oil-filled pressure sensor of the utility model is as follows:
the oil charging pressure sensor comprises a pressure sensing core body, a shell, a baffle assembly and a printed circuit board, wherein an accommodating cavity is formed in the shell, the baffle assembly, the pressure sensing core body and the printed circuit board are sequentially arranged in the accommodating cavity, and the bottom of the accommodating cavity is communicated with the outside through a first pressure guide hole;
the pressure sensing core body comprises a base component, a sleeve, a diaphragm, a compression ring, silicone oil, a diffused silicon piezoresistive chip and a gold wire, wherein the pressure sensing core body and the shell are welded and fixed at the position of a region C;
the baffle assembly comprises a baffle and an elastic body arranged on the upper surface of the baffle, a second pressure guide hole is formed in the baffle, the baffle assembly, the shell and the pressure sensing core body form a cavity, and the cavity is communicated with the second pressure guide hole; the medium fills the first pressure guide hole, the second pressure guide hole and the cavity, and when the medium has pressure, the pressure is transmitted to the cavity; the pressure sensing core converts the pressure of the cavity into an electric signal, and then the electric signal is amplified and processed by the printed circuit board;
because the cavity space is narrow, the medium capacity is small, the expansion amount is small when icing and expanding, and the pressure formed on the core body is relatively large and is small under the cavity structure; meanwhile, the elastomer absorbs volume expansion caused by freezing of a part of medium, so that the pressure rising effect caused by freezing of the medium is reduced; the second pressure guide hole is a small hole, so that the solid medium can be prevented from being extruded inwards when the external medium is frozen and expanded, and damage caused by over-high pressure of the pressure core body is avoided; the baffle is a firm metal piece, and when the external medium is frozen and expanded, the solid medium is prevented from being extruded inwards, so that the damage caused by the fact that the pressure core is pressed too high is avoided.
Further, the compression ring is disposed between the diaphragm and the baffle.
Further, the diffused silicon piezoresistive chip is stuck to the bottom of the base component, and the diffused silicon piezoresistive chip is electrically connected with the other end of the terminal through a gold wire; the induced pressure is converted into an electric signal by a gold wire connecting terminal and a diffused silicon piezoresistive chip and is transmitted to the terminal; when the diaphragm is subjected to external pressure, the diaphragm deforms towards the inner side of the core body, the pressure is transmitted to silicone oil which is liquid, the pressure in the diaphragm is equal everywhere, and then the pressure is transmitted to the diffused silicon piezoresistive chip; the strain gauge and the Wheatstone bridge are arranged on the diffused silicon piezoresistive chip, and after the diffused silicon piezoresistive chip is subjected to pressure, voltage corresponding to the pressure can be output and transmitted out through the terminal; the pressure at the cavity is then finally converted into a voltage signal output.
Further, the sleeve is sleeved outside the base component, the sleeve and the diaphragm are enclosed to form a closed cavity, and the silicone oil is packaged in the closed cavity.
Further, the sleeve and the base assembly are welded and sealed at a region B, and the bottom of the sleeve and the diaphragm are connected in a sealing manner at a region D.
Further, strain gauges and Wheatstone bridges are arranged on the diffused silicon piezoresistive chips, and after the pressure is applied, voltage corresponding to the pressure can be output and transmitted out through terminals.
Further, the baffle is made of metal and is used for blocking the solid medium from being extruded inwards when the external medium is frozen and expanded; the elastomer is soft rubber.
Compared with the prior art, the utility model has the beneficial effects that:
the baffle plate assembly, the shell and the pressure sensing core form a narrow cavity, and when the medium is water-based liquid, the medium freezes along with the temperature decrease under the low temperature condition, and simultaneously the volume of the medium expands. Because the cavity space is narrow, the medium capacity is small, the expansion amount is small when icing and expanding, and the pressure formed on the core body is relatively large and is small under the cavity structure; meanwhile, the elastomer absorbs volume expansion caused by freezing of a part of medium, so that the pressure rising effect caused by freezing of the medium is reduced; the second pressure guide hole is a small hole, so that the solid medium can be prevented from being extruded inwards when the external medium is frozen and expanded, and damage caused by over-high pressure of the pressure core body is avoided; the baffle is a firm metal piece, and when the external medium is frozen and expanded, the solid medium is prevented from being extruded inwards, so that the damage caused by the fact that the pressure core is pressed too high is avoided.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the overall structure of the present utility model;
the figure indicates:
1. a base assembly; 101. a base; 102. glass; 103. a terminal;
2. a sleeve; 3. a membrane; 4. a compression ring; 5. silicone oil; 6. a diffused silicon piezoresistive die; 7. gold wire;
8. a baffle assembly; 801. an elastomer; 802. a baffle;
9. a housing; 10. a printed circuit board; 11. region A; 12. an area B; 13. region C; 14. region D; 15. a first pressure guiding hole; 16. a second pressure guiding hole; 17. a cavity.
Detailed Description
For a better understanding of the objects, structure and function of the present utility model, a hydraulic pressure sensor according to the present utility model will be described in further detail with reference to the accompanying drawings and detailed description.
In the description of the present utility model, it should be understood that the terms "left", "right", "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and "first", "second", etc. do not indicate the importance of the components, and thus are not to be construed as limiting the present utility model.
Example 1:
referring to fig. 1, the present utility model provides a technical solution: the oil-filled pressure sensor comprises a pressure sensing core body, a shell 9, a baffle plate assembly 8 and a printed circuit board 10, wherein an accommodating cavity is formed in the shell 9, the baffle plate assembly 8, the pressure sensing core body and the printed circuit board 10 are sequentially arranged in the accommodating cavity, and the bottom of the accommodating cavity is communicated with the outside through a first pressure guide hole 15;
the pressure sensing core body comprises a base component 1, a sleeve 2, a diaphragm 3, a compression ring 4, silicone oil 5, a diffused silicon piezoresistive chip 6 and a gold wire 7, wherein the pressure sensing core body and a shell 9 are welded and fixed at a region C13, the base component 1 comprises a base 101, the base 101 is sealed with a terminal 103 through glass 102, the glass 102 plays a role in filling and sealing, and one end of the terminal 103 is welded with a printed circuit board 10 at a region A11 to form electric connection;
the baffle plate assembly 8 comprises a baffle plate 802 and an elastic body 801 arranged on the upper surface of the baffle plate 802, a second pressure guide hole 16 is formed in the baffle plate 802, the baffle plate assembly 8, the shell 9 and the pressure sensing core form a cavity 17, and the cavity 17 is communicated with the second pressure guide hole 16; the medium fills the first pressure guide hole 15, the second pressure guide hole 16 and the cavity 17, and when the medium has pressure, the pressure is transmitted to the cavity 17; the pressure sensing core body converts the pressure of the cavity 17 into an electric signal, and then the electric signal is amplified and processed by the printed circuit board 10;
because the cavity 17 has a small space and small medium capacity, the expansion amount is small when icing and expanding, and the pressure formed on the core body is small under a cavity structure with relatively large pressure; at the same time, the elastomer 801 will absorb the volume expansion caused by the freezing of a portion of the medium, reducing the pressure rise effect caused by the freezing of the medium; the second pressure guide hole 16 is a small hole, so that the solid medium can be prevented from being extruded inwards when the external medium is frozen and expanded, and damage caused by over-high pressure of the pressure core body can be avoided; the baffle 802 is a solid piece of metal that blocks the solid medium from being pressed inward when the external medium is frozen and expanded, and prevents the pressure core from being damaged due to excessive pressure.
Further, the pressure ring 4 is disposed between the diaphragm 3 and the baffle 802.
Further, the diffused silicon piezoresistive chip 6 is adhered to the bottom of the base component 1, and the diffused silicon piezoresistive chip 6 is electrically connected with the other end of the terminal 103 through the gold wire 7; the terminal 103 and the diffused silicon piezoresistive chip 6 are connected by the gold wire 7, the induced pressure is converted into an electric signal, and the electric signal is transmitted to the terminal; when the diaphragm 3 receives external pressure in the cavity 17, the diaphragm 3 deforms towards the inner side of the core body, the pressure is transmitted to the silicone oil 5, the silicone oil 5 is liquid, the pressure is equal everywhere in the silicone oil, and then the pressure is transmitted to the diffusion silicon piezoresistive chip 6; the strain gauge and the Wheatstone bridge are arranged on the diffused silicon piezoresistive chip 6, and after the pressure is applied, voltage corresponding to the pressure can be output and transmitted out through a terminal 103; the pressure at the cavity 17 is then finally converted into a voltage signal output.
Further, sleeve pipe 2 cover is established in base subassembly 1 outside, and base subassembly 1, sleeve pipe 2, diaphragm 3 enclose into airtight cavity, and silicone oil 5 encapsulation is in airtight cavity.
Further, the sleeve 2 is welded to the base assembly 1 at a region B12, and the bottom of the sleeve 2 is connected to the diaphragm 3 at a region D14.
Further, the strain gauge and the wheatstone bridge are arranged on the diffused silicon piezoresistive chip 6, and after the pressure is applied, a voltage corresponding to the pressure can be output and transmitted out through the terminal.
Further, the baffle 802 is made of metal, and is used for blocking the solid medium from being extruded inwards when the external medium is frozen and expanded; the elastic body 801 is soft rubber.
Working principle:
in the utility model, the sensor consists of a pressure sensing core body, a shell 9, a baffle plate assembly 8 and a printed circuit board 10, wherein the pressure sensing core body is welded with the shell 9 at a region C13, and the printed circuit board 10 is welded with a terminal 103 at a region A11 to form electrical connection. The medium fills the first pressure guiding hole 15, the second pressure guiding hole 16 and the cavity 17, and when the medium has pressure, the pressure will be transferred to the cavity 17. The pressure sensing core converts the pressure of the cavity 17 into an electrical signal, which is amplified and processed by the printed circuit board 10.
The pressure sensing core body consists of a base component 1, a sleeve 2, a diaphragm 3, a compression ring 4, silicone oil 5, a diffusion silicon piezoresistive chip 6 and a gold wire 7, wherein the pressure sensing core body is welded and sealed at a region B12 and a region D14 to form a closed cavity, and the silicone oil 5 is packaged in the cavity. A diffused silicon piezoresistive chip 6 is arranged in the inner cavity and is adhered to the base component 1. The terminal 103 and the diffused silicon piezoresistive chip 6 are connected by the gold wire 7, and the induced pressure is converted into an electric signal and transmitted to the terminal. The working principle is as follows: when the diaphragm 3 receives external pressure in the cavity 17, the diaphragm 3 deforms toward the inside of the core body, transmitting the pressure to the silicone oil 5, the silicone oil 5 is liquid, the pressure is equalized around the inside, and the pressure is transmitted to the diffused silicon piezoresistive chip 6. The diffused silicon piezoresistive chip 6 is provided with a strain gauge and a wheatstone bridge, and when the pressure is applied, a voltage corresponding to the pressure can be output and transmitted through a terminal 103. The pressure at the cavity 17 is then finally converted into a voltage signal output.
The baffle assembly 8 forms a narrow cavity 17 with the housing 9 and the pressure sensing core. When the medium is a water-based liquid, at low temperatures, the medium will freeze as the temperature decreases, while expanding in volume. Because the cavity 17 has a small space and small medium capacity, the expansion amount is small when icing and expanding, and the pressure formed on the core body is small under a cavity structure with relatively large pressure; at the same time, the elastomer 801 will absorb the volume expansion caused by the freezing of a portion of the medium, reducing the pressure rise effect caused by the freezing of the medium; the second pressure guide hole 16 is a small hole, so that the solid medium can be prevented from being extruded inwards when the external medium is frozen and expanded, and damage caused by over-high pressure of the pressure core body can be avoided; the baffle 802 is a solid piece of metal that blocks the solid medium from being pressed inward when the external medium is frozen and expanded, and prevents the pressure core from being damaged due to excessive pressure.
It will be understood that the utility model has been described in terms of several embodiments, and that various changes and equivalents may be made to these features and embodiments by those skilled in the art without departing from the spirit and scope of the utility model. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the utility model without departing from the essential scope thereof. Therefore, it is intended that the utility model not be limited to the particular embodiment disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.
Claims (6)
1. A hydraulic charge pressure sensor, characterized by: the pressure sensing device comprises a shell (9), wherein a containing cavity is formed in the shell (9), a baffle assembly (8), a pressure sensing core body and a printed circuit board (10) are sequentially installed in the containing cavity, and the bottom of the containing cavity is communicated with the outside through a first pressure guide hole (15);
the pressure sensing core body comprises a base component (1), a sleeve (2), a diaphragm (3), a compression ring (4), silicone oil (5), a diffused silicon piezoresistive chip (6) and a gold wire (7), wherein the pressure sensing core body is welded and fixed with the shell (9), the base component (1) comprises a base (101), the base (101) is sealed with a terminal (103) through glass (102), and one end of the terminal (103) is welded with a printed circuit board (10) to form electric connection;
the baffle assembly (8) comprises a baffle (802) and an elastic body (801) arranged on the upper surface of the baffle (802), a second pressure guide hole (16) is formed in the baffle (802), the baffle assembly (8) is communicated with the shell (9) and the pressure sensing core body to form a cavity (17), and the cavity (17) is communicated with the second pressure guide hole (16).
2. The oil filled pressure sensor according to claim 1, characterized in that the pressure ring (4) is arranged between the diaphragm (3) and the baffle (802).
3. The oil-filled pressure sensor according to claim 1, wherein the diffused silicon piezoresistive chip (6) is adhered to the bottom of the base component (1), and the diffused silicon piezoresistive chip (6) is electrically connected with the other end of the terminal (103) through the gold wire (7).
4. The oil-filled pressure sensor according to claim 1, wherein the sleeve (2) is sleeved outside the base component (1), the sleeve (2) and the diaphragm (3) are enclosed to form a closed cavity, and the silicone oil (5) is encapsulated in the closed cavity.
5. The oil filled pressure sensor according to claim 4, wherein the sleeve (2) is welded to the base assembly (1), and the bottom of the sleeve (2) is connected to the diaphragm (3) in a sealing manner.
6. The oil filled pressure sensor of claim 1, wherein the baffle (802) is made of metal and is used for blocking inward extrusion of the solid medium when the external medium is frozen and expanded; the elastomer (801) is soft rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223348612.9U CN219369015U (en) | 2022-12-13 | 2022-12-13 | Oil charging pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223348612.9U CN219369015U (en) | 2022-12-13 | 2022-12-13 | Oil charging pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219369015U true CN219369015U (en) | 2023-07-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223348612.9U Active CN219369015U (en) | 2022-12-13 | 2022-12-13 | Oil charging pressure sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219369015U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116718305A (en) * | 2023-08-09 | 2023-09-08 | 合肥皖科智能技术有限公司 | Oil charging pressure sensor based on PCB packaging |
| CN116718305B (en) * | 2023-08-09 | 2024-05-31 | 合肥皖科智能技术有限公司 | Oil charging pressure sensor based on PCB packaging |
-
2022
- 2022-12-13 CN CN202223348612.9U patent/CN219369015U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116718305A (en) * | 2023-08-09 | 2023-09-08 | 合肥皖科智能技术有限公司 | Oil charging pressure sensor based on PCB packaging |
| CN116718305B (en) * | 2023-08-09 | 2024-05-31 | 合肥皖科智能技术有限公司 | Oil charging pressure sensor based on PCB packaging |
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