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EP-4737874-A1 - PRESSURE SENSOR

EP4737874A1EP 4737874 A1EP4737874 A1EP 4737874A1EP-4737874-A1

Abstract

A pressure sensor (100), including: a sensing element (10) and a strain structure (30). A pressure inlet channel (11) is provided in the sensing element (10). One end of the sensing element (10) is provided with a pressure inlet port (12) communicated with the pressure inlet channel (11), a periphery of the sensing element (10) is provided with a sensing plane (13), and the strain structure (30) is provided on the sensing plane (13). The sensing element (10) is an integrally manufactured structure, a wall thickness of the sensing element (10) between the sensing plane (13) and an inner surface of the pressure inlet channel (11) is defined as W, and W is not less than 0.1 mm and not greater than 1.5 mm.

Inventors

  • XU, Wenqiang

Assignees

  • Churod Sensing Technologies (Suzhou) Co., Ltd

Dates

Publication Date
20260506
Application Date
20240705

Claims (12)

  1. A pressure sensor, characterized by comprising: a sensing element, wherein a pressure inlet channel is provided in the sensing element, one end of the sensing element is provided with a pressure inlet port communicated with the pressure inlet channel, and a sensing plane is provided on a periphery of the sensing element; a strain structure, wherein the strain structure is provided on the sensing plane, the strain structure comprises a pressure measuring strain gauge and an encapsulation glass, the pressure measuring strain gauge is attached to the sensing plane, and the encapsulation glass is connected to the sensing element and configured to cover the pressure measuring strain gauge; and an integrated circuit unit, wherein the integrated circuit unit is provided at one end of the sensing element away from the pressure inlet port and is electrically connected to the strain structure, wherein the sensing element is an integrally manufactured structure, a wall thickness of the sensing element between the sensing plane and an inner surface of the pressure inlet channel is defined as W, and W is not less than 0.1 mm and not greater than 1.5 mm.
  2. The pressure sensor according to claim 1, wherein a cross-sectional shape of the pressure inlet channel at the sensing plane is circular, square or elliptical.
  3. The pressure sensor according to claim 1 or 2, wherein: the pressure sensor is further provided with an installation housing, and a storage space is provided in the installation housing; the integrated circuit unit is provided in the storage space and is arranged along an extension direction of the storage space; the sensing element is connected to the installation housing and is at least partially provided in the storage space; and one end of the sensing element provided with the pressure inlet port is exposed on one side of the installation housing.
  4. The pressure sensor according to claim 3, wherein the installation housing comprises: a housing body, wherein the storage space is formed in the housing body, one end of the housing body is provided with an installation hole communicated with the storage space, the sensing element is plugged into the installation hole, and a portion of the sensing element provided with the sensing plane is provided in the storage space through the installation hole; a support frame, wherein the support frame is provided in the storage space and connected to the housing body, and the integrated circuit unit is installed at the support frame; and a connection terminal, wherein the connection terminal is electrically connected to the integrated circuit unit and is partially exposed at one end of the housing body away from the installation hole.
  5. The pressure sensor according to claim 4, wherein the support frame comprises: a support ring, wherein the support ring is connected to the housing body and abutted against an inner wall of the housing body, and the support ring surrounds a portion of the sensing element arranged in the storage space; and a fixing frame connected to the support ring, wherein the integrated circuit unit is installed at one side of the fixing frame.
  6. The pressure sensor according to claim 4, wherein the connection terminal comprises: a terminal base provided in the storage space, wherein a first plug-in slot is provided at one end of the terminal base, a second plug-in slot is provided at another end of the terminal base, and an inner side wall of the first plug-in slot is communicated with an inner side wall of the second plug-in slot; and a terminal body, wherein one end of the terminal body is plugged into the second plug-in slot, and another end of the terminal body is exposed at the end of the housing body away from the installation hole, wherein an end of the integrated circuit unit away from the sensing element is plugged into the first plug-in slot, and a portion of the integrated circuit unit arranged in the first plug-in slot is provided with a connection contact, and the connection contact is electrically abutted against the terminal body.
  7. The pressure sensor according to claim 3, wherein the installation housing comprises: a housing having an inner cavity; a cover body provided at one end of the housing, wherein a first through hole is provided at the cover body; a spring provided in the first through hole, wherein one end of the spring extends out of a top surface of the cover body; a conductive terminal located in the inner cavity of the housing, wherein one end of the conductive terminal is abutted against another end of the spring; and a circuit board located in the inner cavity of the housing, wherein one end of the circuit board is connected to another end of the conductive terminal.
  8. The pressure sensor according to claim 7, wherein a top of the cover body is provided with a first plane and a second plane, the second plane is located on one side of the first plane, an arc-shaped transition is formed between the first plane and the second plane, a notch is formed between the first plane and the second plane, and the first through hole is located on the second plane.
  9. The pressure sensor according to claim 7, wherein an aperture of the first through hole varies along an axial length of the first through hole, and the aperture of the first through hole is larger than an outer diameter of the spring.
  10. The pressure sensor according to claim 7, wherein a bottom of the cover body is provided with a groove, a top of the circuit board is provided in the groove, a gap is provided between the top of the circuit board and a wall of the groove, a second through hole is provided on the circuit board, and another end of the conductive terminal is fixedly connected to the circuit board through the second through hole.
  11. The pressure sensor according to claim 7, wherein a spring contact platform is provided on the conductive terminal, a bottom end of the spring is abutted against the spring contact platform, and the conductive terminal is inserted into an inner circle of the spring at one end close to the spring.
  12. The pressure sensor according to claim 10, wherein a number of the first through hole, the spring, the second through hole, and the conductive terminal is multiple.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Patent Application No. 202310821406.5, filed on July 6, 2023, and Chinese Patent Application No. 202420773047.0, filed on April 15, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD The present application relates to the technical field of measuring fluid pressure, and in particular to a pressure sensor. BACKGROUND At present, in order to reduce the space occupied by pressure sensors in hydraulic brake systems, most of the existing pressure sensors adopt lateral sensing elements to sense the pressure of the fluid in the hydraulic brake system. The brake fluid flows into the fluid channel inside the sensing element, and a strain gauge is set on the sensing surface on the outer peripheral side of the sensing element. The strain gauge can sense the pressure applied on the sensing membrane and transfer the pressure to a voltage signal, thereby monitoring the brake pressure in real time. However, in the existing pressure sensors, the sensing elements are mostly split design. A processing hole is manufactured on a side of the sensing element away from the sensing surface, and the inner surface of the channel corresponding to the sensing surface of the fluid channel is processed through the processing hole to make the wall thickness of the sensing element at the sensing surface uniform, and then the sealing ball is welded to seal the processing hole to achieve the sealing of the fluid channel. However, the production cost of the split sensing element is high, and the manufacturing process is more complicated due to the introduction of welding, and there is also a risk of welding leakage. During the welding process, the sensing element is easily affected by the welding process and senses welding stress, resulting in the output drift of the sensing element, affecting the sensing accuracy of the pressure sensor. During the operation of the pressure sensor, thermal stress is also easily generated due to the different materials and thermal expansion coefficients of the seal ball and the sensing element, further reducing the detection accuracy of the pressure sensor, and reducing the practicality and reliability of the pressure sensor. SUMMARY The main purpose of the present application is to provide a pressure sensor, aiming to improve the structure of the sensing element of the pressure sensor and improve the detection accuracy and reliability of the pressure sensor. In order to achieve the above purpose, the present application provides a pressure sensor, including: a sensing element and a strain structure. One end of the sensing element is provided with a pressure inlet port communicated with the pressure inlet channel, a periphery of the sensing element is provided with a sensing plane, and the strain structure is provided on the sensing plane. The sensing element is an integrally manufactured structure, a wall thickness of the sensing element between the sensing plane and an inner surface of the pressure inlet channel is defined as W, and W is not less than 0.1 mm and not greater than 0.6 mm. In an embodiment, a cross-sectional shape of the pressure inlet channel at the sensing plane is circular, square or elliptical. In an embodiment, the strain structure includes a pressure measuring strain gauge and an encapsulation glass, the pressure measuring strain gauge is attached to the sensing plane, and the encapsulation glass is connected to the sensing element and configured to cover the pressure measuring strain gauge. In an embodiment, the pressure sensor is further provides with an integrated circuit unit, and the integrated circuit unit is provided at one end of the sensing element away from the pressure inlet port and is electrically connected to the strain structure. In an embodiment, the pressure sensor is further provided with an installation housing, and a storage space is provided in the installation housing; the integrated circuit unit is provided in the storage space and is arranged along an extension direction of the storage space; the sensing element is connected to the installation housing and is at least partially provided in the storage space; and one end of the sensing element provided with the pressure inlet port is exposed on one side of the installation housing. In an embodiment, the installation housing includes a housing body, a support frame and a connection terminal. The storage space is formed in the housing body, one end of the housing body is provided with an installation hole communicated with the storage space, the sensing element is plugged into the installation hole, and a portion of the sensing element provided with the sensing plane is provided in the storage space through the installation hole. The support frame is provided in the storage space and connected to the housing body, and the integrated circuit unit is installed at the support frame. The connection te