Ultrasonic probe device for introducing shielding gas

Abstract

An ultrasonic probe device for introducing shielding gas comprises a probe assembly internally provided with an ultrasonic transducer, the probe assembly comprises a circuit box, a blowback pipe and an outer protection pipe which are connected in sequence, and the ultrasonic transducer is supported and suspended in the outer protection pipe through a probe branch pipe; an air inlet is formed in one side of the blowback pipe; two rectifying fences are arranged in the reverse blowing pipe at intervals along the axial direction of the reverse blowing pipe; the device is further provided with a draught fan assembly, the draught fan assembly comprises a draught fan box body, a draught fan, a 24V power source and a speed regulator are arranged in the draught fan box body, an air outlet of the draught fan is connected with the corresponding air inlet through a pipeline, and the 24V power source is electrically connected with the power input end of the speed regulator. And the PWM signal output end of the speed regulator is electrically connected with the control signal input end of the fan. The device can prevent substances in the flue gas from entering and accumulating into the ultrasonic probe to influence the transmission of ultrasonic waves, thereby ensuring that the flow velocity detection result of the flue gas is accurate; and the service life of the probe assembly can be prolonged.

Description

Technical Field

[0001] The utility model belongs to a detection device, in particular to an ultrasonic probe device into which protective gas is introduced. Background Art

[0002] With the increase of environmental protection efforts in my country and the improvement of flue gas emission standards, the flue gas emission concentration is getting lower and lower, which puts higher requirements on the accuracy of flue gas monitoring equipment. At present, the monitoring of flue gas is mainly achieved by ultrasonic temperature, pressure and flow rate measuring instruments. The ultrasonic temperature, pressure and flow rate measuring instrument mainly detects the flow rate, temperature and pressure of the flue gas in the flue through ultrasonic probes, temperature sensors and pressure sensors, and transmits them to the ultrasonic temperature, pressure and flow rate measuring instrument head. The signal conversion module in the meter head converts the flow rate, temperature and pressure of the flue gas into digital signals and transmits them to the host computer.

[0003] Existing ultrasonic probe devices are usually inserted vertically in pairs and fixed on the flue wall corresponding to each other. Since water vapor and dust particles may exist in the exhausted flue gas, once these substances enter and accumulate inside the ultrasonic probe, they will not only affect the transmission of ultrasonic waves, thereby affecting the flow rate detection results of the flue gas; but also cause corrosion to the ultrasonic probe, affecting its service life. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an ultrasonic probe device which can measure accurately and stably the protective gas.

[0005] In order to solve the above problems, the utility model adopts the following technical solutions:

[0006] An ultrasonic probe device for introducing protective gas comprises a probe assembly with an ultrasonic transducer therein, and the special features thereof are: the probe assembly comprises a circuit box, a back-blowing pipe and an outer protective pipe connected in sequence, the ultrasonic transducer is suspended in the outer protective pipe through a probe branch pipe support; an air inlet is arranged on one side of the back-blowing pipe for connecting a fan to introduce a protective airflow; two rectifying fences are arranged in the back-blowing pipe along the axial direction thereof at intervals for rectifying the introduced protective airflow so that the airflow is evenly and stably distributed around the ultrasonic transducer;

[0007] The device is also provided with a fan assembly, which includes a fan housing, in which a fan, a 24V power supply and a speed regulator are arranged, the air outlet of the fan is connected to the corresponding air inlet through a pipeline, the 24V power supply is electrically connected to the power input end of the speed regulator, and the PWM signal output end of the speed regulator is electrically connected to the control signal input end of the fan, so as to control the fan speed according to the received flue gas flow rate signal.

[0008] As a further preference, both ends of the backblowing pipe are connected to the flanges of the circuit box and the outer end of the outer protective tube through flanges and bolts, and the rectifying fence is conical and its inner hole is biased toward the air inlet side.

[0009] As a further preference, the angle between the rectifying fence and the axis of the air inlet is 20 degrees to achieve the best rectifying effect.

[0010] As a further preference, the inner end of the outer protective tube is beveled at 45 degrees, and is arranged parallel to the flue gas flow in the flue after installation to reduce the interference of the protective airflow on the airflow in the flue.

[0011] As a further preference, the fan is a turbine centrifugal fan.

[0012] As a further preference, the speed regulator includes a 5V power module, a 3.3V power module, a main control chip and a 485 communication module, the power input end of the 5V power module is electrically connected to the 24V power supply, the power output end of the 5V power module is electrically connected to the power input end of the 485 communication module, and is electrically connected to the power input end of the main control chip through the 3.3V power module, the signal output end of the 485 communication module is connected to the signal input end of the main control chip through a first optocoupler, and the signal output end of the main control chip is sequentially connected to a second optocoupler and a field effect transistor, for amplifying and outputting the PWM signal output by the main control chip.

[0013] As a further preference, the main control chip adopts STM32F103C8T6.

[0014] The beneficial effects of the utility model are:

[0015] 1. Through the air inlet arranged on one side of the back-blowing pipe, the fan can be connected to introduce the protective airflow; through the two rectifying fences arranged along the axial interval in the back-blowing pipe, the introduced protective airflow can be rectified, which can avoid the possibility of turbulence in the probe assembly, make the airflow evenly and stably distributed around the ultrasonic transducer, and can avoid the substances in the flue gas from entering and accumulating inside the ultrasonic probe to affect the transmission of the ultrasonic wave, thereby ensuring the accuracy of the flue gas flow rate detection result; and can extend the service life of the probe assembly.

[0016] 2. Since a fan and a speed regulator are arranged in the fan housing, the PWM signal output terminal of the speed regulator is electrically connected to the control signal input terminal of the fan. By controlling the fan speed according to the received flue gas flow rate signal, the speed regulator can avoid the introduction of excessive protective airflow affecting the flow rate of flue gas emissions, thereby achieving the minimum impact of the introduced protective airflow on flue gas emissions while achieving the maximum protection effect; ensuring accurate and stable measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a schematic diagram of the installation structure of the utility model.

[0018] Figure 2 It is a structural schematic diagram of the probe assembly of the utility model.

[0019] Figure 3 yes Figure 2 Top view of the .

[0020] Figure 4 It is a structural schematic diagram of the fan assembly of the utility model.

[0021] Figure 5 yes Figure 4 Left view of .

[0022] Figure 6 It is the circuit block diagram of the speed regulator.

[0023] In the figure: probe assembly 1, fan assembly 2, temperature pressure flow rate measuring instrument head 3, flue 4,

[0024] Circuit box 101, flange 102, backflush pipe 103, air inlet 104, probe branch pipe 105, outer protective pipe 106, ultrasonic transducer 107, rectifying fence 108;

[0025] Fan box 201, relay terminal 202, circuit breaker 203, 24V power supply 204, speed regulator 205, fan 206, dust cover 207. DETAILED DESCRIPTION

[0026] like Figure 1-Figure 3 As shown, the utility model relates to an ultrasonic probe device for introducing protective gas, comprising a probe assembly 1 and a fan assembly 2, wherein the probe assembly 1 comprises a circuit box 101, a back-blowing pipe 103 and an outer protective pipe 106 which are connected in sequence, flanges are sealed and fixedly connected at both ends of the back-blowing pipe 103 and are connected to the circuit box 101 and the flanges at the outer ends of the outer protective pipe 106 through flanges and bolts, an ultrasonic transducer 107 is arranged in the outer protective pipe 106, the ultrasonic transducer 107 is connected to one end of a probe branch pipe 105 through threads, and is supported and suspended in the outer protective pipe 106 by the probe branch pipe 105; a flange 102 is fixed to the other end of the probe branch pipe 105, and is fixed between the bottom surface of the circuit box 101 and the back-blowing pipe 103 through the flange 102;

[0027] An air inlet 104 is radially provided in the middle of one side of the backblowing tube 103 for connecting a fan to introduce a protective airflow; two rectifying fences 108 are axially spaced apart inside the backblowing tube 103, and the rectifying fence 108 is conical in shape and its inner hole is biased toward the air inlet 104 side, for rectifying the introduced protective airflow so that the airflow is evenly and stably distributed around the ultrasonic transducer 107; the angle between the rectifying fence 108 and the axis of the air inlet 104 is 20 degrees to achieve the best rectifying effect.

[0028] The inner end of the outer protective tube 106 is inclined at 45 degrees, and after installation, it is arranged parallel to the flue gas flow in the flue to reduce the interference of the protective air flow on the air flow in the flue.

[0029] like Figure 4-Figure 5 As shown, the fan assembly 2 includes a fan housing 201, in which a relay terminal 202, an air switch 203, a fan 206, a 24V power supply 204 and a speed regulator 205 are installed. The fan 206 is a turbine centrifugal fan and the power input end is connected to an external power supply through the air switch 203. The air outlet of the fan 206 is connected to the corresponding air inlet 104 through a pipeline. The 24V power supply 204 is electrically connected to the power input end of the speed regulator 205. The PWM signal output end of the speed regulator 205 is electrically connected to the control signal input end of the fan 206, which is used to control the speed of the fan 206 according to the received flue gas flow rate signal. Dust covers 207 are symmetrically provided on both sides of the fan 206 on the fan housing 201, which are used to filter the air intake of the fan 206.

[0030] like Figure 6 As shown, the speed regulator 205 includes a 5V power module, a 3.3V power module, a main control chip and a 485 communication module, the power input end of the 5V power module is electrically connected to the output end of the 24V power supply 204, the power output end of the 5V power module is electrically connected to the power input end of the 485 communication module, and is electrically connected to the power input end of the main control chip through the 3.3V power module; the signal input end of the 485 communication module is used to connect to the host computer, and the signal output end is connected to the signal input end of the main control chip through the first optical coupler to reduce external interference and adapt to various working conditions; the signal output end of the main control chip is sequentially connected to the second optical coupler and the field effect tube, which is used to amplify and output the PWM signal output by the main control chip. The main control chip adopts STM32F103C8T6.

[0031] When installing Figure 1As shown, the two probe assemblies 1 are fixed on both sides of the flue 4 wall through the outer protective tube 106 and the coaxial lines correspond to each other, the backblowing pipe air inlets 104 of the two probe assemblies 1 are connected to the corresponding fan assemblies through pipelines, and the signal transmission cables of the ultrasonic transducers 107 of the two probe assemblies 1 are led out from the circuit box 101 and then aggregated through the relay terminal 202 provided in the corresponding fan assembly, and are uniformly connected to the temperature, pressure and flow rate measuring instrument head 3, and the ultrasonic signal is converted into a flue gas flow rate through the signal conversion module in the meter head and then transmitted to the host computer.

[0032] When working, after the fan is started, the airflow is blown into the back-blowing pipe 103 through the air inlet 104 arranged on one side of the back-blowing pipe 103; the two rectifying fences 108 arranged in the back-blowing pipe 103 can rectify the introduced protective airflow, thereby avoiding the possibility of turbulence in the probe assembly, making the airflow evenly and stably distributed around the ultrasonic transducer, and avoiding the substances in the flue gas from entering and accumulating inside the ultrasonic probe to affect the transmission of the ultrasonic wave, thereby ensuring the accuracy of the flue gas flow rate detection result; and extending the service life of the probe assembly;

[0033] At the same time, the speed regulator 205 automatically controls the fan speed according to the flue gas flow rate signal received from the upper computer, which can avoid the introduction of excessive protective airflow affecting the flow rate of flue gas emissions, thereby achieving the minimum impact of the introduced protective airflow on flue gas emissions while achieving the maximum protection effect; ensuring accurate and stable measurement.

[0034] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An ultrasonic probe device into which protective gas is introduced, comprising a probe assembly with an ultrasonic transducer built therein, characterized in that: The probe assembly includes a circuit box, a back-blowing tube and an outer protective tube connected in sequence, and the ultrasonic transducer is suspended in the outer protective tube through the probe branch pipe support; an air inlet is provided on one side of the back-blowing tube for connecting a fan to introduce a protective airflow; two rectifying fences are provided in the back-blowing tube along its axial direction to rectify the introduced protective airflow so that the airflow is evenly and stably distributed around the ultrasonic transducer; The device is also provided with a fan assembly, which includes a fan housing, in which a fan, a 24V power supply and a speed regulator are arranged, the air outlet of the fan is connected to the corresponding air inlet through a pipeline, the 24V power supply is electrically connected to the power input end of the speed regulator, and the PWM signal output end of the speed regulator is electrically connected to the control signal input end of the fan, so as to control the fan speed according to the received flue gas flow rate signal.

2. The ultrasonic probe device with protective gas according to claim 1, characterized in that: The two ends of the back-blowing pipe are connected to the flanges of the circuit box and the outer end of the outer protective pipe through flanges and bolts. The rectifying fence is conical and its inner hole is biased toward the air inlet side.

3. The ultrasonic probe device with protective gas according to claim 2, characterized in that: The included angle between the rectifying bar and the axis of the air inlet is 20 degrees to achieve the best rectifying effect.

4. An ultrasonic probe device with protective gas according to any one of claims 1 to 3, characterized in that: The inner end of the outer protective pipe is inclined at 45 degrees, and after installation, it is arranged parallel to the flue gas flow in the flue to reduce the interference of the protective air flow on the air flow in the flue.

5. The ultrasonic probe device with protective gas according to claim 1, characterized in that: The fan is a turbine centrifugal fan.

6. The ultrasonic probe device with protective gas according to claim 1, characterized in that: The speed regulator includes a 5V power module, a 3.3V power module, a main control chip and a 485 communication module. The power input end of the 5V power module is electrically connected to the 24V power supply, the power output end of the 5V power module is electrically connected to the power input end of the 485 communication module, and is electrically connected to the power input end of the main control chip through the 3.3V power module. The signal output end of the 485 communication module is connected to the signal input end of the main control chip through a first optical coupler, and the signal output end of the main control chip is sequentially connected to a second optical coupler and a field effect transistor for amplifying and outputting a PWM signal output by the main control chip.

7. The ultrasonic probe device with protective gas according to claim 6, characterized in that: The main control chip adopts STM32F103C8T6.

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