CN116839795A - Closed pressure sensor - Google Patents

Abstract

The invention discloses a closed pressure sensor, which comprises a light-emitting part, a grating part and a photoelectric part; the light-emitting part is a light source bin and is used for providing a light source; the grating part is a pressure sensitive element and is used for changing a light path according to the pressure change of the fluid; the photoelectric part is a signal processing unit and is used for converting an optical signal into an electric signal and providing the electric signal for external monitoring equipment; the light-emitting part, the grating part and the photoelectric part are sequentially connected and combined to form the closed pressure sensor. When the fluid pressure of the environment where the closed pressure sensor is located is changed, the grating part is deformed, so that the light channel inside the grating part is changed, and the photoelectric part converts the captured light signal into an electric signal to be output, so that the real-time monitoring of the fluid pressure of the environment is realized.

Description

A closed pressure sensor

Technical field

The invention relates to a closed pressure sensor and belongs to the field of sensing technology.

Background technique

Pressure sensor is a general-purpose sensor device that converts pressure signals into electrical signal output. It is widely used in various industrial automatic control environments as well as in many technical fields such as civil equipment, measuring equipment, and medical equipment. In the existing technology, common pressure sensors include strain gauge pressure sensors, piezoresistive pressure sensors, capacitive pressure sensors, etc., which are mainly used to monitor pressure changes of fluids in pipelines or containers. The monitoring method can be short-term monitoring. It can also be used for continuous dynamic long-term monitoring. Traditional pressure sensors generally have problems such as high cost of use, complex maintenance, and short service life.

In the Chinese invention patent with patent number ZL 201680073747.7, a pressure sensor and an operating method of the pressure sensor are disclosed. The pressure sensor includes at least one housing, a pressure sensor element arranged in the housing, a lighting device and a control/evaluation unit also arranged in the housing. The pressure sensor element has a semiconductor material and a measuring membrane, and a first pressure is applied to a first side of the measuring membrane, and a second pressure is applied to a second side of the measuring membrane, so that the measuring membrane experiences a pressure-related deflection to measure the pressure variable.

Contents of the invention

The technical problem to be solved by the present invention is to provide a closed pressure sensor.

In order to achieve the above objects, the present invention adopts the following technical solutions:

A closed pressure sensor includes a light-emitting part, a grating part and a photoelectric part; wherein,

The light-emitting part is used to provide a light source; the grating part is a light path, which changes shape according to changes in fluid pressure; the photoelectric part is used to convert optical signals into electrical signals and provide them to external monitoring equipment;

The light-emitting part, the grating part and the photoelectric part are connected and combined in sequence to form the closed pressure sensor;

When the fluid pressure in the environment where the closed pressure sensor is located changes, the grating part deforms, causing its internal light channel to change. The photoelectric part converts the captured optical signal into an electrical signal output, thereby realizing Real-time monitoring of application ambient fluid pressure.

Preferably, inside the closed pressure sensor, a first partition is provided at the connection between the light-emitting part and the grating part, and a second partition is provided at the connection between the grating part and the photoelectric part, The first partition and the second partition are used to separate two adjacent parts to form independent spaces.

Preferably, the outer shell of the light-emitting part is made of hard material, and the inside is a light source chamber; the light source chamber is made of highly transparent material, the inner wall is coated with phosphorescent material, and is filled with tritium gas to form a tritium lamp.

Preferably, the grating body is made of flexible material and has a through hole inside for transmitting light from the light-emitting part to the optoelectronic part.

Preferably, the through holes of the grating part are in the shape of a honeycomb, or in the shape of at least two staggered strip-shaped fences.

Preferably, the casing of the optoelectronic part is made of hard material, and a photoelectric sensor, an analog-to-digital converter, a power supply battery and a plurality of optical fibers are provided inside; wherein,

One end of each optical fiber facing the grating part is spherical, the other end is connected to the input end of the photoelectric sensor, the output end of the photoelectric sensor is connected to the input end of the analog-to-digital converter; the power supply battery The output terminals are respectively connected to the power terminals of the photoelectric sensor and the analog-to-digital converter to provide operating power for them.

Preferably, a signal transmitter is also provided inside the photoelectric part, and the output end of the analog-to-digital converter is connected to the input end of the signal transmitter for sending the pressure electrical signal to an external monitoring device.

Preferably, the light-emitting part, the grating part and the photoelectric part are formed by integrated injection molding, or are formed by a combination of threaded connections.

Preferably, the light-emitting part and the grating part are integrally formed by injection molding, and then combined with the photoelectric part through threaded connection.

Preferably, the first separator and the second separator are made of highly translucent materials.

Compared with the existing technology, the closed pressure sensor provided by the present invention adopts a technical solution of using a light source chamber and a flexible grating as a pressure sensitive element, and cooperates with a photoelectric signal processing unit to achieve real-time monitoring of fluid pressure in a pipeline or container. . The closed pressure sensor provided by the invention has beneficial effects such as ingenious and reasonable structural design, low design cost, high work efficiency, and convenient maintenance.

Description of the drawings

1A and 1B are schematic structural diagrams of a closed pressure sensor provided by an embodiment of the present invention;

Figure 2 is an outline view of the light-emitting part, the grating part and the optoelectronic part in the embodiment of the present invention;

3A and 3B are schematic structural diagrams of the through holes inside the grating part in the embodiment of the present invention;

Figure 4 is a schematic diagram of the photoelectric conversion principle in the optoelectronic part in the embodiment of the present invention;

Detailed ways

The technical content of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in Figures 1A and 1B, an embodiment of the present invention provides a closed pressure sensor with a ball-end cylinder shape (see Figure 1A) or a straight-end cylinder shape (see Figure 1B). It consists of a light-emitting part, a grating part and a Composed of optoelectronics department. Among them, the light-emitting part, the grating part and the photoelectric part can be formed by integrated injection molding, or they can be connected and combined in three sections.

Among them, the light-emitting part is the head section of the closed pressure sensor, which is a light source compartment and is used to provide a light source. The grating part is the middle section of the closed pressure sensor. It is a light path and is also a pressure sensitive element. Its shape changes according to changes in fluid pressure. The photoelectric part is the tail section of the closed pressure sensor. It is a signal processing unit used to convert optical signals into electrical signals and provide them to external monitoring equipment.

Inside the closed pressure sensor, a first partition is provided at the connection between the light-emitting part and the grating part, and a second partition is provided at the connection between the grating part and the photoelectric part. The first partition and the second partition are used to separate the two parts to form an independent space, and can also prevent contamination of the grating part or the photoelectric part when the source chamber is damaged.

As shown in FIG. 2 , in one embodiment of the present invention, the casing of the light-emitting part is made of hard materials, such as metal materials, polymer materials, bioceramic materials, etc. A light source compartment is provided inside the light-emitting part. The light source compartment is made of highly transparent material. The inner wall of the light source chamber is coated with phosphorescent material and filled with tritium gas to form a beta lamp (also known as a tritium lamp), which is used to provide a light source.

The grating part is made of flexible materials, such as polyester, silicone and other flexible materials with good elasticity. A through hole for passing light is opened inside the grating part for transmitting the light from the light-emitting part to the optoelectronic part. The shape of the through hole is shown in Figure 3A and Figure 3B, and can be designed in a honeycomb shape, or in the shape of multiple rows of staggered bar-shaped fences extending toward the axis. In the bar-shaped grating part in Figure 3A and Figure 3B, six bar-shaped gratings are designed along the circumference. The designed number of bar-shaped gratings can be increased or reduced according to actual needs. At least two layers of bar-shaped fences should be provided in the axial direction of the grating part, and two adjacent layers of bar-shaped fences should be arranged in a staggered manner.

The first partition provided at the connection between the light-emitting part and the grating part is made of highly transparent material, such as glass or acrylic plate, and is used to separate the light-emitting part and the grating part to form an independent space. The first partition can also use a convex lens, which in addition to the separation function, can also amplify and output the light from the light source compartment.

The second partition provided at the connection between the grating part and the optoelectronic part is made of highly transparent material, such as glass or acrylic sheet, to separate the grating part and the optoelectronic part to form an independent space.

As shown in Figure 4, in one embodiment of the present invention, the casing of the optoelectronic part is made of hard materials, such as metal materials, polymer materials, bioceramic materials, etc. It is equipped with a photoelectric sensor, an analog-to-digital (A/D) converter, a signal transmitter, a power supply battery and multiple optical fibers. Among them, one end of each optical fiber facing the grating part is spherical to better capture and conduct light; the other end of each optical fiber is connected to the input end of the photoelectric sensor, and the output end of the photoelectric sensor is connected to the input of the analog-to-digital converter. The output terminal of the analog-to-digital converter is connected to the input terminal of the signal transmitter. The output end of the power supply battery is connected to the power end of the photoelectric sensor, the analog-to-digital converter, and the signal transmitter respectively to provide working power for them.

Among them, the photoelectric sensor is used to convert optical signals into analog electrical signals; the analog-to-digital converter is used to convert analog electrical signals into digital electrical signals; and the signal transmitter is used to send digital electrical signals to external monitoring equipment.

Depending on the usage environment of the closed pressure sensor, the signal transmitter unit in the optoelectronic part can be eliminated and replaced with a transmission method with output wires to transmit digital electrical signals to external monitoring equipment.

In one embodiment of the present invention, the light-emitting part, the grating part and the photoelectric part of the closed pressure sensor can be formed by integrated injection molding, or can also be formed by a combination of threaded connections. Among them, the closed pressure sensor formed by integrated injection molding is suitable for short-term use and is easy to process; the closed pressure sensor formed by threaded connection combination is suitable for long-term use. When problems such as damage or aging occur, each section can Disassembly and replacement reduces maintenance costs.

In addition, the light-emitting part, grating part and photoelectric part of the closed pressure sensor can also be combined and connected in another way, that is, the light-emitting part and the grating part are formed by integrated injection molding and then combined with the photoelectric part through threaded connection. Usually, the service life of beta lamp is 8 to 10 years, so it does not need to be replaced frequently. The photoelectric part adopts a detachable thread connection to facilitate the maintenance or replacement of the electrical components in the photovoltaic part.

The overall structure of the closed pressure sensor is introduced in detail above. It should be noted that, in addition to the β lamp given in the above embodiment, other active or passive light sources can be used as the light source of the light-emitting part. In addition to the honeycomb-shaped and strip-shaped fence shapes given in the embodiments, the through-holes of the grating part can also adopt other shapes of through-holes. The embodiment of the present invention does not impose any limitation on this.

In addition, when a closed pressure sensor is used as an implantable pressure sensor in the medical field, the materials of its light-emitting part, grating part and photoelectric part must be made of medical-grade materials to comply with medical industry standards.

The working principle of the closed pressure sensor provided by the embodiment of the present invention is described below with reference to the accompanying drawings.

According to the usage environment, install the closed pressure sensor to the designated position in the pipeline or container. When working, the light source compartment of the light-emitting part of the closed pressure sensor, that is, the β lamp, continuously emits light. After the emitted light passes through the through hole of the grating part, it is captured by the optical fiber of the photoelectric part and transmitted to the photoelectric sensor. The photoelectric sensor converts the optical signal. It is an analog electrical signal, which is then converted into a digital electrical signal through an analog-to-digital converter. Finally, the digital electrical signal is sent to an external monitoring device through a signal transmitter, or the digital electrical signal output by the analog-to-digital converter is directly output by a wire. to external monitoring equipment.

When the pressure of the fluid in the pipe or container changes, the grating portion of the closed pressure sensor is deformed by the pressure, causing the internal honeycomb or bar-shaped fence-like through hole structure to deform, causing the size of the light channel to change. Therefore, When the light flux captured by the optical fiber of the optoelectronic part changes, at this time, the analog electrical signal output by the photoelectric sensor and the digital electrical signal output by the analog-to-digital converter change accordingly, realizing real-time monitoring of the fluid pressure in the pipeline or container.

In summary, compared with the existing technology, the closed pressure sensor provided by the present invention adopts a technical solution of using a light source chamber and a flexible grating as a pressure sensitive element, and cooperates with a photoelectric signal processing unit to realize the detection of pressure in a pipeline or container. Real-time monitoring of fluid pressure. The closed pressure sensor provided by the invention has beneficial effects such as ingenious and reasonable structural design, low design cost, high work efficiency, and convenient maintenance.

It should be noted that the above-mentioned embodiments are only examples, and the technical solutions of various embodiments can be combined, which are all within the protection scope of the present invention.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more than two, unless otherwise explicitly and specifically limited.

The closed pressure sensor provided by the present invention has been described in detail above. For those of ordinary skill in the art, any obvious changes made to the invention without departing from the essence of the invention will constitute an infringement of the patent rights of the invention and will bear corresponding legal liability.

Claims (10)

1. A closed pressure sensor, characterized by including a light-emitting part, a grating part and a photoelectric part; wherein, The light-emitting part is used to provide a light source; the grating part is a light path, which changes shape according to changes in fluid pressure; the photoelectric part is used to convert optical signals into electrical signals and provide them to external monitoring equipment; The light-emitting part, the grating part and the photoelectric part are connected and combined in sequence to form the closed pressure sensor; When the fluid pressure in the environment where the closed pressure sensor is located changes, the grating part deforms, causing its internal light channel to change. The photoelectric part converts the captured optical signal into an electrical signal output, thereby realizing Real-time monitoring of application ambient fluid pressure. 2. The closed pressure sensor as claimed in claim 1, characterized in that: Inside the closed pressure sensor, a first partition is provided at the connection between the light-emitting part and the grating part, and a second partition is provided at the connection between the grating part and the photoelectric part. The first partition and The second partition is used to separate two adjacent parts to form an independent space. 3. The closed pressure sensor as claimed in claim 1, characterized in that: The outer shell of the light-emitting part is made of hard material, and the inside is a light source chamber; the light source chamber is made of highly transparent material, the inner wall is coated with phosphorescent material, and is filled with tritium gas to form a tritium lamp. 4. The closed pressure sensor according to claim 1, characterized in that: The grating part is made of flexible material and has a through hole inside for transmitting the light from the light-emitting part to the optoelectronic part. 5. The closed pressure sensor as claimed in claim 4, characterized in that: The shape of the through holes of the grating part is a honeycomb shape, or a shape of at least two staggered strip-shaped fences. 6. The closed pressure sensor according to claim 1, characterized in that: The casing of the photoelectric part is made of hard material, and a photoelectric sensor, an analog-to-digital converter, a power supply battery and multiple optical fibers are provided inside; wherein, One end of each optical fiber facing the grating part is spherical, the other end is connected to the input end of the photoelectric sensor, the output end of the photoelectric sensor is connected to the input end of the analog-to-digital converter; the power supply battery The output terminals are respectively connected to the power terminals of the photoelectric sensor and the analog-to-digital converter to provide operating power for them. 7. The closed pressure sensor as claimed in claim 6, characterized in that: A signal transmitter is also provided inside the photoelectric part, and the output end of the analog-to-digital converter is connected to the input end of the signal transmitter for sending pressure electrical signals to external monitoring equipment. 8. The closed pressure sensor according to claim 1, characterized in that: The light-emitting part, the grating part and the photoelectric part are formed by integrated injection molding, or are formed by a combination of threaded connections. 9. The closed pressure sensor as claimed in claim 1, characterized in that: After the light-emitting part and the grating part are formed by integrated injection molding, they are combined with the photoelectric part through threaded connection. 10. The closed pressure sensor as claimed in claim 2, characterized in that: The first partition and the second partition are made of highly transparent materials.