CN111521879A - Electric field instrument capable of balancing strong wind interference and lightning early warning device - Google Patents

Abstract

The invention provides an electric field meter and a lightning early warning device capable of balancing strong wind interference. The electric field meter includes a support rod, a probe shield, an electric field meter probe and a wind balance component. The wind balance component includes a negative pressure tube and a negative pressure generating part. The negative pressure One end of the pipe is connected to the probe shield, and the inlet is located between the induction sheet and the ground shielding sheet, and the negative pressure generating part is connected to the end of the negative pressure pipe away from the probe shield. Under the action of negative pressure, the airflow between the induction sheet and the grounding shielding sheet is disturbed and flows directionally to form airflow compensation, so as to avoid the sudden change of speed of the grounding shielding sheet caused by the strong airflow in a single direction, thereby improving the accuracy of electric field monitoring. Reduce the false alarm rate of lightning early warning devices. At the same time, the airflow flows between the sensing sheet and the grounding shielding sheet to form a pneumatic purging to prevent dust or haze particles from being adsorbed on the sensing surface of the sensing sheet or the grounding shielding sheet, further improving the accuracy of electric field monitoring and prolonging the use of the electric field meter life.

Description

Electric field meter and lightning early warning device capable of balancing strong wind interference

technical field

The invention belongs to the technical field of lightning monitoring and early warning, in particular to an electric field meter and a lightning early warning device capable of balancing strong wind interference.

Background technique

The establishment of an electrical monitoring and early warning system can improve the accuracy and timeliness of lightning early warning, reduce casualties and property losses caused by lightning, and play a very important role in the development of lightning protection and disaster reduction and ensuring social safety in production.

The electric field meter is an inaccessible part of the lightning monitoring and early warning system. It mainly uses the principle that the conductor generates induced charges in the electric field. The electric field meter sensor is composed of a stator and a moving plate. The rotation of the moving plate converts the induced charge of the stator into A voltage proportional to the atmospheric electric field. When the moving plate rotates, the stator is alternately exposed to the atmospheric electric field, thereby generating an alternating electrical signal, the magnitude of which is proportional to the intensity of the atmospheric electric field.

However, in the actual application process of the existing electric field meter, if encountering strong wind weather, especially in some mountainous areas, the wind force is large, the wind direction is changeable, and the wind force is unstable. The electric field strength is unstable, which increases the false alarm rate of the lightning monitoring and early warning system. On the other hand, the frequent weather conditions such as sandstorm and haze in some areas cause the accumulation of dust or haze particles in the sensing space formed between the moving plate and the stationary plate, resulting in a decrease in the detection accuracy of the electric field intensity by the electric field meter. , the false alarm rate of the lightning monitoring and early warning system is increased.

SUMMARY OF THE INVENTION

In view of this, the present invention provides an electric field meter capable of balancing the interference of strong winds, so as to solve the problem that the detection accuracy of the electric field meter is reduced and the lightning monitoring and early warning system is incorrectly caused by special weather conditions such as strong wind, sand and haze in the prior art. Technical issues with increased reporting rates.

The invention also provides a lightning early warning device to solve the technical problem of the high false alarm rate of the lightning alarm device in the prior art.

The technical scheme adopted by the present invention to solve its technical problems is:

An electric field meter capable of balancing strong wind disturbances, comprising:

support rod;

a probe protective cover, the probe protective cover is installed on the upper end of the support rod;

an electric field meter probe, the electric field meter probe is accommodated in the probe protective cover, the electric field meter probe includes an induction sheet and a ground shielding sheet, the induction sheet and the grounding shielding sheet are arranged in parallel; and

A wind balance component, the wind balance component includes a negative pressure pipe and a negative pressure generating part, one end of the negative pressure pipe is connected to the probe shield, and the inlet is located between the induction sheet and the ground shielding sheet, the The negative pressure generating member is connected to one end of the negative pressure tube away from the probe shield, and can generate negative pressure in the negative pressure tube.

Preferably, the probe protective cover includes an inner cover and an outer cover, the outer cover is arranged outside the inner cover, and an airflow guide cavity is formed between the inner cover and the inner cover, and an airflow inlet is provided at the lower end of the inner cover. The airflow inlet is located between the induction sheet and the ground shielding sheet, and the negative pressure pipe communicates with the airflow guide cavity.

Preferably, the negative pressure pipe is arranged vertically upward, the negative pressure generating member is tubular, and is vertically arranged above the negative pressure pipe.

Preferably, the negative pressure generating member includes an air flow inlet section, a negative pressure generating section and an air flow outlet section arranged in sequence, and the air flow inlet section is trumpet-shaped and reduces in diameter toward the side close to the negative pressure generating section, so The airflow outlet section is in the shape of a bell mouth and expands in diameter to a side away from the negative pressure generating section, and the negative pressure pipe is connected to the negative pressure generating section.

Preferably, the negative pressure generating member is a Venturi type vacuum generator, and the negative pressure pipe is connected to the vacuum suction port of the Venturi type vacuum generator.

Preferably, the negative pressure generating member can rotate in a horizontal direction relative to the negative pressure pipe; a guide plate is also provided on the negative pressure generating member, and the guide plate can drive the negative pressure generating member under the action of wind Rotate so that the airflow inlet of the negative pressure generating member faces the wind direction.

Preferably, the guide plate is arranged at one end of the airflow outlet of the negative pressure generating member.

A lightning early warning device includes the above electric field meter capable of balancing strong wind interference.

It can be seen from the above technical solutions that the present invention provides an electric field meter and a lightning early warning device capable of balancing strong wind interference. The probe shield is connected, and the inlet is close to between the sensing sheet and the ground shielding sheet. On the one hand, under the action of negative pressure, the airflow located between and near the induction sheet and the grounding shielding sheet is disturbed and flows in a directional flow, so that when encountering strong winds, the air flow passes through the induction sheet and the grounding shielding sheet The airflow between and near the sheets is forced to change direction and flow toward the inlet of the negative pressure tube to form airflow compensation, so as to avoid the sudden acceleration or sudden deceleration of the grounding shielding sheet caused by strong airflow in a single direction, thereby increasing the electric field. The accuracy of intensity monitoring reduces the false alarm rate of the lightning monitoring and early warning system. On the other hand, under the action of negative pressure, the airflow flows between the sensing sheet and the grounding shielding sheet to form pneumatic purging, which can effectively prevent dust or haze particles from being adsorbed on the sensing sheet or the grounding sheet On the sensing surface of the shielding sheet, the accuracy of electric field intensity monitoring is further improved, the false alarm rate of the lightning monitoring and early warning system is reduced, and the accumulation of dust or haze particles on the sensing surface of the sensing sheet or the grounding shielding sheet is avoided. Corrosion of the induction sheet or the grounding shield sheet prolongs the service life of the electric field meter.

Description of drawings

Figure 1 is a schematic diagram of the structure of an electric field meter capable of balancing strong wind interference.

FIG. 2 is a front view of an electric field meter capable of balancing strong wind disturbances.

FIG. 3 is a schematic cross-sectional view taken along the line A-A shown in FIG. 2 .

FIG. 4 is a partial enlarged view of the portion A shown in FIG. 3 .

FIG. 5 is a schematic diagram of the structure of the electric field meter probe.

6 is a schematic cross-sectional view of an electric field meter probe.

Figure 7 is a bottom view of the electric field meter probe.

FIG. 8 is a schematic diagram of circuit connection of a lightning early warning device in an embodiment.

In the figure: electric field meter 10 capable of balancing strong wind interference, support rod 100, probe shield 200, installation cavity 201, airflow guide cavity 202, inner cover 210, airflow inlet 211, outer cover 220, electric field meter probe 300, induction sheet 310, Ground shielding sheet 320, installation platform 330, DC motor 340, microprocessor integrated circuit board 350, first shielded cable 360, second shielded cable 370, wind balance assembly 400, negative pressure tube 410, negative pressure generator 420, The guide plate 430 , the air inlet section 421 , the negative pressure generating section 422 , the air outlet section 423 , the front-end controller 20 , and the upper computer 30 .

Detailed ways

The technical solutions and technical effects of the present invention will be further elaborated below with reference to the accompanying drawings of the present invention.

Referring to FIGS. 1 and 2 , in one embodiment, an electric field meter 10 capable of balancing strong wind interference includes: a support rod 100 , a probe shield 200 , an electric field meter probe 300 and a wind balance assembly 400 . The probe shield 200 is installed on the upper end of the support rod 100 , and the electric field meter probe 300 is accommodated in the probe shield 200 . The sensing sheet 310 is arranged in parallel with the grounding shielding sheet 320 .

The wind balance assembly 400 includes a negative pressure tube 410 and a negative pressure generating member 420 . One end of the negative pressure tube 410 is connected to the probe shield 200 , and the inlet is located between the sensing sheet 310 and the grounding shielding sheet 320 . , the negative pressure generating member 420 is connected to the end of the negative pressure pipe 410 away from the probe shield 200 , and can generate negative pressure in the negative pressure pipe 410 .

On the one hand, under the action of negative pressure, the airflow between and near the sensing sheet 310 and the ground shielding sheet 320 is disturbed and flows directionally, so that when a strong wind is encountered, it passes through the sensing sheet 310 and the ground shielding sheet 320. The airflow between and near the grounding shielding sheets 320 is forced to change direction, and flows toward the inlet of the negative pressure pipe 410 to form airflow compensation, so as to prevent the grounding shielding sheet 320 from suddenly accelerating or accelerating due to strong airflow in a single direction. Sudden deceleration, thereby improving the accuracy of electric field intensity monitoring and reducing the false alarm rate of the lightning monitoring and early warning system. On the other hand, under the action of negative pressure, the airflow flows between the sensing sheet 310 and the grounding shielding sheet 320 to form pneumatic purging, thereby effectively preventing dust or haze particles from being adsorbed on the sensing sheet 310 or the grounding shielding sheet 320 . The sensing surface of the grounding shielding sheet 320 further improves the accuracy of electric field intensity monitoring, reduces the false alarm rate of the lightning monitoring and early warning system, and avoids the induction of accumulation on the sensing sheet 310 or the grounding shielding sheet 320. Dust or haze particles on the surface corrode the sensing sheet 310 or the grounding shielding sheet 320, thereby prolonging the service life of the electric field meter.

Please refer to FIG. 3 to FIG. 7 together. Specifically, the electric field meter probe 300 includes a mounting platform 330 , an induction sheet 310 , a ground shielding sheet 320 , a DC motor 340 and a microprocessing integrated circuit board 350 . The induction sheet 310 is mounted on the mounting platform 330 and is insulated from the mounting platform 330 . The DC motor 340 is installed on the side of the installation platform 330 away from the induction sheet 310 , and the output end passes through the installation platform 330 and the induction sheet 310 , and the ground shielding sheet 320 is connected to the DC The end of the output end of the motor 340 is arranged in parallel with the induction sheet 310 . The cross-section of the induction sheet 310 is circular, and the induction sheet 310 is provided with a plurality of fan-shaped holes that are evenly spaced. The ground shielding sheet 320 has the same structure as the sensing sheet 310 . The DC motor 340 drives the ground shielding sheet 320 to rotate. When the grounding shielding sheet 320 rotates, the induction sheet is alternately shielded or exposed, thereby generating an induced alternating signal in the electric field. The generated alternating signal is captured and processed through amplification, filtering, etc., to obtain the current relative electric field strength. When the electric field strength changes, the generated alternating signal changes abruptly, so as to judge whether there is lightning approaching or judge the lightning warning level.

In a preferred embodiment, the electric field meter probe 300 can also acquire electric field polarity signals at the same time. At this time, the DC motor 340 is a Hall motor and has a Hall sensor. The micro-processing integrated circuit board 350 includes at least an electric field intensity detection circuit and an electric field polarity detection circuit. The Hall sensor is electrically connected to the electric field polarity detection circuit through the first shielded cable 360. The electric field intensity detection circuit is electrically connected through a second shielded cable 370 .

The Hall pulse signal of the DC motor 340 detected by the Hall sensor is acquired, and shaped and amplified by the electric field polarity detection circuit to form a square wave signal. For example, the microprocessor integrated circuit board 350 is provided with a phase-sensitive detector, a low-pass filter and an amplifier, and the Hall pulse signal passes through the phase-sensitive detector, the low-pass filter and the amplifier in sequence, The square wave signal is formed. The polarity of the electric field is judged by the direction of the square wave signal formed. By obtaining the Hall pulse signal of the DC motor 340, instead of the traditional pulse signal obtained by the small blade and the photoelectric switch, the structure of the device is simplified, the difficulty of installation, inspection and maintenance is reduced, and the output load of the motor is reduced, thereby facilitating the extension of the device. service life.

The installation platform 330 is detachably connected to the probe shield 200 , the installation platform 330 and the shield 200 can form a closed installation cavity 201 , and the DC motor 340 is accommodated with the microprocessor integrated circuit board 350 in the installation cavity 201 . For example, the protective cover 200 is connected with the mounting platform 330 through threads, snap connections or through self-sufficient bolts. On the one hand, after the installation platform 330 is connected to the protective cover 200 , the induction sheet 310 and the ground shielding sheet 320 are located outside the installation platform 330 , so that the induction sheet 310 can be exposed to the air. On the other hand, the DC motor 340 and the micro-processing integrated circuit board 350 and related circuits are all housed in the relatively airtight mounting cavity 201, so that the direct-current motor 340 and the micro-processing integrated circuit board can be connected to each other. The protection of precision components such as 350 further extends the service life of the equipment.

Please continue to refer to FIG. 3 and FIG. 4 , in a preferred embodiment, the probe protective cover 200 includes an inner cover 210 and an outer cover 220 . An airflow guide cavity 202 is formed between the covers 210, and an airflow inlet 211 is provided at the lower end of the inner cover 210. The airflow inlet 211 is located between the sensing sheet 310 and the grounding shielding sheet 320, and the negative pressure pipe 410 communicates with the The airflow guide cavity 202 is described.

Specifically, the lower end of the inner cover 210 is provided with the annular airflow inlet 211 , and the height of the airflow inlet 211 is located between the sensing sheet 310 and the grounding shielding sheet 320 . The airflow guide cavity 202 is formed between the inner cover 210 and the outer cover 220 , and the negative pressure pipe 410 may communicate with any position of the airflow guide cavity 202 . Under the force of negative pressure, the airflow between the sensing sheet 310 and the grounding shielding sheet 320 and under the grounding shielding sheet 320 changes direction, along the circumference of the grounding shielding sheet 320 and at the fan-shaped holes, through the annular The airflow inlet 211 enters the airflow guide cavity 202 and is discharged from the negative pressure pipe 410 .

Generally, in order to facilitate production and manufacture, the outer cover 220 with the airflow guide cavity 202 is covered outside the protective cover of the conventional electric field meter, and the inner wall of the outer cover 220 and the protective cover (the inner cover 210 ) are The outer walls are close together, and the lower end of the outer cover 220 defines an annular air inlet 211 . An annular air inlet 211 is provided in the middle of the installation platform 330 . During installation, the air inlet 211 of the outer cover 220 can be aligned with the air inlet 211 of the installation platform 330 . That is to say, without changing the installation structure of the traditional electric field meter, through the above method, the traditional electric field meter can be upgraded and transformed, and the electric field meter and the lightning early warning device with low false alarm rate have been obtained.

The negative pressure generating member 420 may be a passive braking device such as a negative pressure fan. In a preferred embodiment, in order to utilize the natural wind force, the airflow direction at the induction sheet 310 and the grounding shield sheet 320 can be changed. , to prevent the detection error of the electric field meter from being caused by strong wind in a single direction, and to be able to purge the induction sheet 310 and the grounding shielding sheet 320 at the same time, the negative pressure pipe 410 is arranged vertically upward, and the negative pressure generator 420 is tubular, and is vertically arranged above the negative pressure pipe 410. During the process of natural wind passing through the negative pressure generating member 420, under the action of the Venturi effect and the chimney effect, the negative pressure pipe 410 A negative pressure suction force is formed at the location, and the airflow direction at the inlet of the negative pressure pipe 410 is changed.

For example, the negative pressure generating member 420 includes an airflow inlet section 421 , a negative pressure generating section 422 and an airflow outlet section 423 arranged in sequence. The diameter of the air outlet section 423 is flared, and the diameter is expanded toward the side away from the negative pressure generating section 422 , and the negative pressure pipe 410 communicates with the negative pressure generating section 422 . When there is wind, the airflow enters from the airflow inlet section 421, is compressed, the flow velocity becomes faster, and is diffused and discharged from the airflow outlet section 423. During the process, due to the stack effect and the Venturi effect, in the negative A suction force is formed at the pressure tube 410 .

In order to further improve the wind power balance efficiency, the negative pressure generating member 420 is a venturi type vacuum generator, the negative pressure pipe 410 is communicated with the vacuum suction port of the venturi type vacuum generator, and the strong wind is caused by the inlet of the venturi vacuum generator. Entering, a vacuum area is formed at the negative pressure pipe 410, the air at the inlet of the negative pressure pipe 410 supplements the vacuum area to form an air flow, and the airflow direction at the entrance of the negative pressure pipe 410 is changed. Sheet 310 is purged with the ground shield sheet 320 .

In order to further improve the wind balance efficiency, the negative pressure generating member 420 can rotate in the horizontal direction relative to the negative pressure pipe 410 . The negative pressure generating member 420 is also provided with a guide plate 430, the guide plate 430 can drive the negative pressure generating member 420 to rotate under the action of the wind, so that the airflow inlet of the negative pressure generating member 420 is facing the wind direction . For example, the guide plate 430 is disposed at one end of the airflow outlet of the negative pressure generating member 420 to keep the airflow inlet of the negative pressure generating member 420 facing the wind direction in a strong wind state.

Please refer to FIG. 8 together. In another specific embodiment, a lightning early warning device includes the electric field meter 10 as described above, which can balance the interference of strong winds.

Specifically, the lightning early warning device includes the electric field meter 10 as described above, and further includes a front-end controller 20 and a host computer 30, the front-end controller 20 is electrically connected to the electric field instrument 10, and the host computer 30 is electrically connected to the electric field instrument 10. The front end controller 20 is sexually connected. That is to say, through the electric field meter 10, stable lightning electric field strength data and electric field polarity data are obtained, and the data is converted (for example, converted by an A/D converter) to form a transmittable signal, and the data is converted through a wire (for example, RS485 cable) or wireless (eg Zigbee, LORA, GPS, etc.) form is transmitted to the host computer 30, and the display, analysis, storage, early warning, etc. are completed on the host computer, so as to realize remote lightning monitoring and early warning.

In one embodiment, the lightning early warning device includes at least two sets of electric field meters 10 as described above, and several of the electric field meters 10 are electrically connected to the upper computer 30 through the front-end controller 20, so as to realize regional lightning monitoring Warning.

What is disclosed above is only the preferred embodiment of the present invention, of course, it cannot limit the scope of the right of the present invention. Those of ordinary skill in the art can understand that all or part of the process of realizing the above-mentioned embodiment can be made according to the claims of the present invention. The equivalent changes of the invention still belong to the scope covered by the invention.

Claims (8)

1. an electric field instrument capable of balancing strong wind interference, is characterized in that, comprises: support rod; a probe protective cover, the probe protective cover is installed on the upper end of the support rod; an electric field meter probe, the electric field meter probe is accommodated in the probe protective cover, the electric field meter probe includes an induction sheet and a ground shielding sheet, the induction sheet and the grounding shielding sheet are arranged in parallel; and A wind balance component, the wind balance component includes a negative pressure pipe and a negative pressure generating part, one end of the negative pressure pipe is connected to the probe shield, and the inlet is located between the induction sheet and the ground shielding sheet, the The negative pressure generating member is connected to one end of the negative pressure tube away from the probe shield, and can generate negative pressure in the negative pressure tube. 2 . The electric field meter capable of balancing strong wind interference according to claim 1 , wherein the probe protective cover comprises an inner cover and an outer cover, and the outer cover is arranged outside the inner cover and is connected with the inner cover. 3 . An air flow guide cavity is formed therebetween, an air flow inlet is provided at the lower end of the inner cover, the air flow inlet is located between the induction sheet and the ground shield sheet, and the negative pressure pipe communicates with the air flow guide cavity. 3 . The electric field meter capable of balancing strong wind interference according to claim 2 , wherein the negative pressure tube is arranged vertically upward, the negative pressure generating member is tubular, and is vertically arranged on the side of the negative pressure tube. 4 . above. 4. The electric field instrument capable of balancing strong wind interference as claimed in claim 3, wherein the negative pressure generating member comprises an airflow inlet section, a negative pressure generating section and an airflow outlet section arranged in sequence, and the airflow inlet section is a horn. shape, and the diameter is reduced toward the side close to the negative pressure generating section, the airflow outlet section is bell-shaped, and expands to the side away from the negative pressure generating section, and the negative pressure pipe communicates with the Negative pressure generation section. 5. the electric field instrument capable of balancing strong wind interference as claimed in claim 3, is characterized in that, described negative pressure generating part is a venturi type vacuum generator, and described negative pressure tube communicates the vacuum of venturi type vacuum generator suction point. 6. The electric field meter capable of balancing strong wind interference according to claim 4 or 5, wherein the negative pressure generating member can rotate in a horizontal direction relative to the negative pressure pipe; the negative pressure generating member is also provided with There is a guide plate, which can drive the negative pressure generating member to rotate under the action of wind, so that the airflow inlet of the negative pressure generating member faces the wind direction. 7 . The electric field meter capable of balancing strong wind interference according to claim 6 , wherein the guide plate is arranged at one end of the airflow outlet of the negative pressure generating member. 8 . 8. A lightning early warning device, characterized in that it comprises the electric field meter capable of balancing strong wind interference as described in any one of claims 1 to 7.

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