CN219065506U

CN219065506U - Wind speed measuring device

Info

Publication number: CN219065506U
Application number: CN202223332428.5U
Authority: CN
Inventors: 龚锐
Original assignee: Nanjing Engma Instrument Technology Co ltd
Current assignee: Nanjing Engma Instrument Technology Co ltd
Priority date: 2022-12-13
Filing date: 2022-12-13
Publication date: 2023-05-23
Anticipated expiration: 2032-12-13

Abstract

The utility model discloses a wind speed measuring device which comprises a hot film type wind speed chip, a chip fixing base and a probe rod, wherein vertical plates are arranged on two sides of the chip fixing base, the outer side face and the inner side face of each vertical plate are of arc-shaped curved surface structures, the hot film type wind speed chip is arranged in the chip fixing base, the chip fixing base is arranged on the probe rod, a circuit board is arranged in the probe rod, the other end of the probe rod is connected with a cable, and the circuit board is used for transmitting detection data of the hot film type wind speed chip and outputting the detection data to the outside through the cable. The utility model has the advantages of low wind speed measurement based on the hot film wind speed principle, high measurement precision, good long-term stability and reduced dependence on the installation direction.

Description

Wind speed measuring device

Technical Field

The utility model relates to the technical field of wind speed measurement, in particular to a wind speed measurement device.

Background

The wind speed sensor is an important instrument capable of continuously monitoring the wind speed and measuring the real-time wind speed at the position. In the environments of laboratories, weighing chambers, laminar flow hoods and the like, the air flow velocity is small, usually below 1m/s, and is difficult to measure. The existing wind speed measuring instrument can be divided into mechanical type, dynamic pressure type, thermal film type and the like according to different measuring working principles; the anemometer based on the mechanical principle is mainly a three-cup anemometer, and the anemometer has larger volume and larger error and is usually used for detecting the magnitude of meteorological wind; the anemometer based on the pitot tube principle measures and calculates the wind speed by comparing the pressure difference between dynamic pressure and static pressure, the precision is difficult to meet the requirement when measuring the wind speed slightly, and the price is relatively high; the wind speed sensor based on the hot film principle calculates the wind speed by the heat taken away by the air flow, has higher sensitivity and precision, can be used for measuring the breeze speed below 1m/s, and is more suitable for the industries of laboratories, weighing chambers, laminar flow ventilators and the like.

At present, the measurement accuracy of a wind speed sensor based on a hot film principle is still not high enough, and the use requirement of a compact industry is difficult to meet.

Disclosure of Invention

The utility model provides a wind speed measuring device which has the advantages of measuring low wind speed based on a hot film wind speed principle, along with high measuring precision, good long-term stability and reduced dependence on the installation direction.

The wind speed measuring device is characterized by comprising a hot film type wind speed chip, a chip fixing base and a probe rod, wherein vertical plates are arranged on two sides of the chip fixing base, the outer side face and the inner side face of each vertical plate are of arc-shaped curved surface structures, the hot film type wind speed chip is arranged in the chip fixing base, the chip fixing base is arranged on the probe rod, a circuit board is arranged in the probe rod, the other end of the probe rod is connected with a cable, and the circuit board is used for outputting detection data of the hot film type wind speed chip outwards through the cable after the detection data of the hot film type wind speed chip are transmitted.

The utility model is further characterized in that the top end of the chip fixing base is provided with a sealing cover, and the sealing cover is provided with an arrow for indicating the installation direction of the device.

The utility model is further characterized in that the chip fixing base is provided with a through hole penetrating up and down, the PCB board in the hot film type wind speed chip is arranged in the through hole, and the outgoing line of the hot film type wind speed chip extends into the probe rod and is connected with the circuit board.

The utility model is further arranged that grooves are arranged on the upper and lower surfaces of the chip fixing base and positioned around the through holes, and the grooves are used for filling and sealing UV glue to fix the hot film type wind speed chip.

The utility model further provides that the probe rod is detachably connected with a flange, the flange is sleeved on the probe rod, the flange is connected with a locking nut in a threaded manner, and the flange is provided with a plurality of connecting holes.

The utility model is further arranged that the tail end of the probe rod is connected with a cable through a waterproof connector, and the cable is connected with the circuit board.

The utility model further provides that the circuit board comprises a power supply module, an MCU main control module, a sensor signal processing module, a signal acquisition module and an output module, wherein the sensor signal processing module transmits output data of the hot film type wind speed chip and outputs the output data to the signal acquisition module, the signal acquisition module amplifies and converts the signal into a digital signal and outputs the digital signal to the MCU main control module, and the output module amplifies and outputs the signal to the outside.

The utility model further provides that the hot film type wind speed chip at least comprises a temperature measuring resistor RS and a heating resistor RH, and the temperature measuring resistor RS and the heating resistor RH and the resistors R22 and R23 arranged on the circuit board form a Wheatstone bridge.

In summary, the beneficial effects of the utility model are as follows:

1. according to the utility model, the hot film type wind speed chip is adopted to collect the ambient wind speed data, so that the breeze speed between 0 and 2m/s can be measured, and the measuring precision is high and the volume is small;

2. in the utility model, the chip fixing base is used for installing the hot-film type wind speed chip and carrying out anti-collision protection on the hot-film type wind speed chip, in addition, the outer side surface and the inner side surface of the vertical plate on the chip fixing base are of arc-shaped curved surface structures, the coanda effect is utilized under the breeze speed, the static pressure value of the position of the hot-film type wind speed chip is increased according to the Bernoulli principle under the high wind speed, and the two technologies are simultaneously applied, so that the dependence of the hot-film type wind speed chip on the installation angle can be effectively reduced, namely, the dependence of the chip fixing base on the installation angle is reduced;

3. the hot film type wind speed chip is provided with a heating resistor RH, the resistor, the temperature measuring resistor RS and the resistors R22 and R23 form a Wheatstone bridge, when the resistance of the temperature measuring resistor RS changes, the current on the heating resistor RH changes, so that the current of the heating resistor RH has self-feedback regulation capability, the temperature of the hot film type wind speed chip tends to a stable value during working, the hot film type wind speed chip works at the temperature of low temperature drift, and the long-term stability and reliability of products are improved.

Drawings

FIG. 1 is a schematic overall structure of an embodiment of the present utility model, wherein FIG. 1a is a front view, FIG. 1b is a side view, and FIG. 1c is a perspective view;

fig. 2 is a schematic structural diagram of a chip fixing base and hot film wind speed chip assembly according to an embodiment of the present utility model, wherein fig. 2a is a front view, fig. 2b is a side view, fig. 2c is a top view, and fig. 2d is a perspective view;

FIG. 3 is a schematic view of a probe rod and flange combination according to an embodiment of the present utility model, wherein FIG. 3a is a front view and FIG. 3b is a cross-sectional view;

FIG. 4 is a schematic circuit diagram of a power module in an embodiment of the utility model;

FIG. 5 is a schematic circuit diagram of an MCU master control module in an embodiment of the utility model;

FIG. 6 is a schematic circuit diagram of a sensor signal processing module in an embodiment of the utility model;

FIG. 7 is a schematic circuit diagram of a signal acquisition module in an embodiment of the utility model;

fig. 8 is a schematic circuit diagram of an output module in an embodiment of the utility model.

In the figure, 1, a chip fixing base; 2. a hot film wind speed chip; 3. a cover; 4. a probe rod; 7. a waterproof joint; 9. a flange; 10. a lock nut; 11. EVA gasket; 12. a cable; 13. a circuit board.

Detailed Description

The following describes in detail the embodiments of the present utility model with reference to the drawings.

Examples: referring to fig. 1 to 8, a wind speed measuring device comprises a hot film type wind speed chip 2, a chip fixing base 1 and a probe rod 4. The hot film type wind speed chip 2 is installed in the chip fixing base 1, the chip fixing base 1 is installed on the probe rod 4, a circuit board 13 is arranged in the probe rod 4, the other end of the probe rod 4 is connected with a cable 12, and the circuit board 13 is used for transmitting detection data of the hot film type wind speed chip 2 and outputting the detection data outwards through the cable 12.

The chip fixing base 1 is characterized in that vertical plates are arranged on two sides of the chip fixing base 1, the outer side face and the inner side face of the vertical plates are of arc-shaped curved surface structures, the hot film type wind speed chip 2 is arranged between the vertical plates on the two sides of the chip fixing base 1, the Conda effect is utilized under the breeze speed, the static pressure value of the position of the wind speed chip is increased under the high wind speed according to the Bernoulli principle, and the dependence of the wind speed chip on the angle can be effectively reduced due to simultaneous application of the two technologies. The chip fixing base 1 is cylindrical in shape, a sealing cover 3 is arranged at the top of the chip fixing base, and an arrow for indicating the installation direction of the device is arranged on the sealing cover 3. The arrow indicates the direction of the air flow through the hot film wind speed chip 2.

The chip fixing base 1 is provided with a through hole penetrating up and down, a PCB board in the hot film type wind speed chip 2 is arranged in the through hole, and an outgoing line of the hot film type wind speed chip 2 extends into the probe rod 4 and is connected with the circuit board 13. The upper and lower surfaces of the chip fixing base 1 are provided with grooves at positions around the through holes, and the grooves are used for filling and sealing UV glue to fix the hot film type wind speed chip 2.

The flange 9 is detachably connected to the probe rod 4, an inner round hole is formed in the flange 9, the flange 9 is sleeved on the probe rod 4, a locking nut 10 is connected to the flange 9 in a threaded mode, a plurality of connecting holes are formed in the flange 9, and an EVA gasket 11 is arranged on one side of the flange 9.

The tail end of the probe rod 4 is connected with a cable 12 through a waterproof connector 7, and the cable 12 is connected with a circuit board 13.

The circuit board 13 comprises a power supply module, an MCU main control module, a sensor signal processing module, a signal acquisition module and an output module, wherein the sensor signal processing module transmits output data of the hot film type wind speed chip 2 and outputs the data to the signal acquisition module, the signal acquisition module amplifies and converts the signal into a digital signal and outputs the digital signal to the MCU main control module, and the output module amplifies and outputs the signal to the outside.

The power module inputs 24V direct current power from the input end, enters the input end of the power chip LM317 through the anti-reverse diode D1, the filter capacitors C23, C5 and C7, the LM317 is an adjustable linear voltage stabilizing source, 15VDC is modulated and output through the resistors R1 and R3, the 15VDC is used as the input end of the power chip LP2951ACD, the LP2951ACD is fixedly output for +3.3VDC, and power is supplied to the rear-end components.

The MCU master control module comprises a master control chip, the master control chip adopts a low-power MSP430 series singlechip, a minimum system of the singlechip is shown in the figure, in addition, P1.6 and P1.7 are respectively configured, SCL_ADS of the AD acquisition module is connected with SDA_ADS, and P2.0, P2.1 and P2.2 are connected with SYNC1, SCLK1 and DIN1 of the DA conversion module.

The hot film type wind speed chip at least comprises a temperature measuring resistor RS and a heating resistor RH, and the temperature measuring resistor RS, the heating resistor RH and resistors R22 and R23 arranged on the circuit board form a Wheatstone bridge. Because air flows, heat on the hot film type wind speed chip is taken away, the temperature measuring resistor RS and the heating resistor RH are changed, signal acquisition is carried out by monitoring output voltages at two ends of the bridge, the acquired voltage value is also changed, and then the signal is amplified by the LM321 amplifying circuit.

The signal acquisition module calculates the signal transmitted by the sensor signal processing module through the double operational amplifier LM321 and transmits the signal to the AD conversion chip ADS1110A0, and the analog signal is converted into a digital signal which can be identified by the singlechip.

In the output module, V1 outputs 0-5V voltage along with U3A through LM258 operational amplifier, then carries out 2 times amplification through U3B, outputs 0-10V standard signal, and simultaneously, D4 and D5 play a role in preventing reverse connection in consideration of port protection.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and improvements could be made by those skilled in the art without departing from the inventive concept, which falls within the scope of the present utility model.

Claims

1. The utility model provides a wind speed measuring device, its characterized in that, includes hot film formula wind speed chip, chip unable adjustment base and probe rod, the both sides of chip unable adjustment base have the riser, the lateral surface and the medial surface of riser set up to the arc curved surface structure, hot film formula wind speed chip is installed in chip unable adjustment base, chip unable adjustment base installs on the probe rod, be equipped with the circuit board in the probe rod, the other end of probe rod is connected with the cable, the circuit board is used for outwards outputting the detection data of hot film formula wind speed chip after the transmission warp cable.

2. The wind speed measurement device according to claim 1, wherein a cover is provided on a top end of the chip fixing base, and an arrow for indicating a mounting direction of the device is provided on the cover.

3. The wind speed measurement device according to claim 1, wherein the chip fixing base is provided with a through hole penetrating up and down, a PCB board in the hot film type wind speed chip is mounted in the through hole, and an outgoing line of the hot film type wind speed chip extends into the probe rod and is connected with the circuit board.

4. A wind speed measuring device according to claim 3, wherein grooves are formed in the upper and lower surfaces of the die-fixing base at positions around the through holes, and the grooves are used for filling and sealing UV glue to fix the hot film type wind speed die.

5. The wind speed measuring device according to claim 1, wherein the probe rod is detachably connected with a flange, the flange is sleeved on the probe rod, the flange is connected with a locking nut in a threaded manner, and the flange is provided with a plurality of connecting holes.

6. The wind speed measurement device according to claim 1, wherein the tail end of the probe is connected with a cable through a waterproof joint, and the cable is connected with a circuit board.

7. The wind speed measuring device according to claim 1, wherein the circuit board comprises a power supply module, an MCU main control module, a sensor signal processing module, a signal acquisition module and an output module, wherein the sensor signal processing module transmits output data of the hot film type wind speed chip and outputs the output data to the signal acquisition module, the signal acquisition module amplifies and converts the signal into a digital signal and outputs the digital signal to the MCU main control module, and the output module amplifies and outputs the signal to the outside.

8. The wind speed measuring device according to claim 7, wherein the hot film wind speed chip at least comprises a temperature measuring resistor RS and a heating resistor RH, and the temperature measuring resistor RS and the heating resistor RH and the resistors R22 and R23 arranged on the circuit board form a wheatstone bridge.