RU223747U1 - Device for determining the direction and speed of movement of gases and liquids - Google Patents

Abstract

The utility model relates to mechanical engineering, to devices for determining the direction and speed of movement of gases and liquids, and can be used as a flow sensor for air, gases, and liquids. The technical result is simplification of the design, ensuring durability, wear resistance, expanded possibilities for use in various types of gaseous and liquid media, including contaminated and chemically aggressive ones, due to the use of an elastic reflective plate made of wear-resistant polymer with low residual plastic deformation and a sealed casing; reduced inertia; Possibility of integration into electronic systems and devices. The working body is a flexible elastic plate 2 made of polymer material, one end of which is rigidly attached to the base 1 made of solid material. The base is stationary relative to the measured gas or liquid flow. An accelerometer module (LIS3DH) 6 mounted on a printed circuit board 5 is attached to the opposite end of the plate. The accelerometer changes its position and angle to the horizon depending on the strength of the air flow. 2 salary f-ly, 3 ill.

Description

The utility model relates to mechanical engineering, in particular to determining the direction and speed of movement of gases and liquids, is used as a flow sensor for air, gases, liquids, can be used in systems for monitoring environmental parameters to automate systems for opening windows and doors in industry and in everyday life , including fire protection, in water supply control and accounting systems, gas and liquid flow meters.

To determine the speed of movement of air and gases, anemometers of various types are known and used, divided according to the principle of obtaining a useful signal: rotating, thermal, acoustic, laser, ultrasonic. To determine the speed of fluid movement and calculate flow, various types of flow meters are known and used: turbine, rotary, vortex, membrane, ultrasonic.

Different types have certain advantages and disadvantages. The main disadvantages include inertia, susceptibility to mechanical wear of types containing rotating elements (rotating anemometers, turbine, rotary, vortex, membrane flow meters), design complexity (laser, ultrasonic, acoustic anemometers, ultrasonic flow meters).

The presented device has a different principle of operation from the above - inclinometer, namely: the principle of measuring the angle of inclination of an object subject to the pressure of the flow of the measured medium - gas or liquid, relative to the gravitational field of the Earth, additionally converting useful data on the angle of inclination of the object into an electrical signal and sending the latter to the device output. Constructive implementation has a set of advantages over other types,

The closest device to the patented device is the velocity pressure sensor (patent RU2804917C1). The disadvantages of the sensor are the complexity of the design (use of a receiver and wave generator), limited scope (use for measuring gases and liquids in pipelines).

The utility model is aimed at solving the problems of improving the performance characteristics of air and gas flow sensors, determining the speed of air flow, expanding the areas and possibilities of application, including the possibility of use in open spaces.

The device includes a flexible elastic narrow plate made of polymer material, one end of which is rigidly connected to a base attached to an element stationary relative to the working medium being measured; to the opposite end, freely suspended in the working medium, an electronic accelerometer module having at least two axes, as well as electrical wires for connecting to an external signal processing unit located externally.

The plate with the accelerometer can be placed in a flexible sealed casing to protect the accelerometer module from exposure to the working environment. The plate itself can also serve as a sealed casing for the accelerometer, due to the chemical resistance of some polymers to working environments.

Glass-filled thermopolyurethane, for example TOTAL GF-30 (Filamentarno brand!), which has flexibility, low plastic (residual) deformation, high wear resistance, chemical and temperature resistance, can be used as a polymer. An LIS3DH (manufactured by STMicroelectronics) can be used as an accelerometer, placed on a printed circuit board made of glass fiber laminate of type FR-4, to which an electrical power and data cable is connected, connected to an external power supply and data processing unit via a standard electrical data transfer interface of the SPI type.

The technical result is simplification of the design, ensuring durability, wear resistance, expanded possibilities for use in various types of gaseous and liquid media, including polluted and chemically aggressive ones, due to the use of an elastic reflective plate made of wear-resistant polymer with low residual plastic deformation and a sealed casing; reduced inertia compared to rotary, turbine, rotating, vortex liquid and gas sensors due to the combination of low mass and high elasticity of the plate, providing increased accuracy in measuring flow pulsations; Possibility of integration into electronic systems and devices thanks to the electrical data output interface.

The essence of the utility model is explained in the drawings, where

fig. 1 – device design;

fig. 2 – block diagram of the electrical connection of the device with an external power supply and signal processing;

fig. 3 – placement of the device on the window frame to determine the speed of the through air flow when entering/from the room for automatic control of the electric window drive.

Figure 1 shows the design of a patented device for determining the direction and speed of movement of gases and liquids.

The working body is a flexible, elastic, narrow plate 2 made of a polymer material, one end of which is rigidly attached to a base 1 made of a solid material, such as plastic. The length of the plate can be 5 cm, the width of the plate is 2 cm, and the thickness of the plate is 2 mm. The base is stationary relative to the measured gas or liquid flow, moving in the possible directions indicated by the arrows. Accelerometer module (LIS3DH) 6, mounted on printed circuit board 5, is attached to the opposite end of the plate, periodically, with a data update rate of up to 1600 Hz, transmits SPI acceleration data along the X, Y axes via an electrical digital data bus to an external signal processing unit , combined with the low-voltage power supply of the module, via an electrical cable 3. The structure can be isolated from the external environment with a sealed flexible casing 4 for mechanical and electrical protection of the accelerometer module and cable. Data on the X, Y axes have a linear dependence on the angle of inclination of the accelerometer to the horizon level. When a medium flow is applied to the freely suspended end of the plate, it deflects together with the accelerometer, depending on the force of the air flow exerting pressure on the plate from the side of its movement. At the same time, the accelerometer changes its position and angle to the horizon (ranging from 0 to 180°) also depending on the strength of the air flow.

In fig. Figure 2 shows a block diagram of connecting the device’s accelerometer to an external power supply and signal processing.

Figure 3 shows an example of installing a sensor on the impost of the frame of a single-leaf plastic window for automatic control of an electric window drive depending on the wind force.

Claims (3)

1. A device for determining the direction and speed of movement of gases and liquids, characterized in that it consists of a flexible elastic elongated plate made of flexible elastic polymer material, one end of which is rigidly connected to a base stationary relative to the flow of gas or liquid, while to the freely suspended opposite An accelerometer electronic module having at least two axes, as well as electrical wires for connection to an external signal processing unit located externally, is rigidly attached to the end. 2. The device according to claim 1, characterized in that the plate with the accelerometer is placed in a flexible sealed casing. 3. The device according to claim 1, characterized in that the accelerometer is located inside the plate.