CN210803513U

CN210803513U - Ultrasonic wind meter

Info

Publication number: CN210803513U
Application number: CN201921673463.9U
Authority: CN
Inventors: 徐宇红
Original assignee: Shenzhen Fine Offset Electronics Co ltd
Current assignee: Shenzhen Fine Offset Electronics Co ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2020-06-19
Anticipated expiration: 2029-09-30

Abstract

The utility model relates to an ultrasonic wave anemometer, include: a transmitter for transmitting ultrasonic waves; a reflection unit for reflecting the ultrasonic wave from the transmitter; a receiver for receiving the reflected ultrasonic waves; the reflecting unit comprises a reflecting plate and a mesh covering layer, and the mesh covering layer covers the upper surface of the reflecting plate. The embodiment of the utility model provides an in, owing to set up netted overburden on the reflecting plate, can be so that the rapid on the surface of reflecting unit of raindrop/water droplet that falls on the reflecting unit scatters, and then eliminated the reflecting unit and formed irregular shape and the hydrops of height on the surface, guaranteed ultrasonic wave anemoscope measuring accuracy under the wind and rain situation.

Description

Ultrasonic wind meter

Technical Field

The application relates to the field of measurement, especially, relate to an ultrasonic anemometer.

Background

An apparatus using ultrasonic wind measurement is generally called an ultrasonic wind meter, and measures wind speed and wind direction by using a plurality of ultrasonic probes to transmit and receive ultrasonic waves and by using a time difference of the ultrasonic waves propagated in the air.

In consideration of the relation between the propagation distance and the accuracy of the ultrasonic wave, the volume and the cost of the instrument, and the like, the ultrasonic wave transmitted by the ultrasonic anemometer is usually received after being reflected by the reflecting plate, and the reflection condition of the reflecting plate on the ultrasonic wave directly affects the measurement accuracy.

The ultrasonic anemometer is used in outdoor environment, and rain water is one of the most frequently and most frequently influenced factors for the reflecting plate.

In order to reduce the accumulation of rainwater on the reflecting plate, the ultrasonic anemometer in the prior art usually coats a nano waterproof material on the reflecting plate, so that water drops falling on the reflecting plate can flow away as soon as possible. However, the cost of the nano waterproof material is high, the cost of the ultrasonic anemometer is directly influenced, the service life of the nano waterproof material is short in the outdoor environment, the waterproof effect begins to be reduced after two weeks and three months later, the waterproof effect is completely lost, so that a user cannot paint the nano waterproof material again to obtain high accuracy, the use cost of the ultrasonic anemometer is further increased, and the convenience of the ultrasonic anemometer is reduced. The ultrasonic anemometer is installed outdoors and coated with a nano waterproof material, so that the installation and maintenance costs are very high.

Therefore, the reflecting plate coated with the waterproof material of the ultrasonic anemometer in the center of the prior art has high cost, short service life and difficult maintenance.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem or at least partially solve the technical problem, the application provides an ultrasonic anemometer, which can improve the measurement accuracy of the ultrasonic anemometer and reduce the cost.

In a first aspect, the present application provides an ultrasonic anemometer, which is applied to an ultrasonic anemometer, wherein the reflection unit is configured to reflect an ultrasonic wave from a transmitter and make the reflected ultrasonic wave received by a receiver;

the reflecting unit comprises a reflecting plate and a mesh covering layer, and the mesh covering layer covers the upper surface of the reflecting plate.

Optionally, the upper surface of the reflector is a cambered surface with a high middle part and a low edge or a structure with a plane combined with an inclined surface.

Optionally, a gap exists between the mesh-like cover layer and the reflection plate.

Optionally, a gap exists between the mesh-like cover layer and the reflection plate, and includes:

a liquid channel is arranged between the reticular covering layer and the reflecting plate, so that the liquid flows out of the reflecting unit through the liquid channel.

the edge of the netted covering layer is provided with an edge part with a preset width, the edge part is in contact with the reflecting plate, and the thickness of the edge part is larger than that of the netted covering layer, so that a gap exists between the netted covering layer and the reflecting plate.

Optionally, a liquid channel exists between the mesh-like cover layer and the reflection plate, and includes:

the edge part is divided into a plurality of first edge parts and a plurality of second edge parts, the thicknesses of the first edge parts and the second edge parts are different, the thicknesses of the first edge parts and the second edge parts are larger than the thickness of the reticular covering layer, and the first edge parts and the second edge parts are arranged at intervals.

Optionally, the mesh-like cover layer is made of a material having high reflectivity to ultrasonic waves.

Optionally, the mesh-like cover layer is made of water-impregnated material.

Optionally, the mesh-like cover layer is provided with at least two fixing points for adhering and/or welding the mesh-like cover layer to the reflector plate.

Optionally, a sinking bayonet is arranged on the reflector plate, and the mesh-shaped covering layer is connected with the reflector plate by being inserted into the sinking bayonet.

Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:

the embodiment of the utility model provides an ultrasonic anemometer, include: a transmitter for transmitting ultrasonic waves; a reflection unit for reflecting the ultrasonic wave from the transmitter; a receiver for receiving the reflected ultrasonic waves; the reflecting unit comprises a reflecting plate and a mesh covering layer, and the mesh covering layer covers the upper surface of the reflecting plate. The embodiment of the utility model provides an in, owing to set up netted overburden on the reflecting plate, can make the raindrop/water droplet that falls on the reflecting unit disperse on the reflecting unit's surface faster, reduce the thickness of the surperficial hydrops of reflecting unit, reduce the influence of hydrops to the testing result, improve ultrasonic anemometer's accuracy and accuracy.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.

Fig. 1 is a schematic structural view of an ultrasonic anemometer according to an embodiment of the present invention;

fig. 2 is a schematic view of a reflection unit according to an embodiment of the present invention;

FIG. 3 is a schematic view showing raindrops falling on a reflection plate;

FIG. 4 is a schematic view of a water mark;

FIG. 5 is a top view of a mesh overlay according to an embodiment of the present invention;

fig. 6 is a schematic longitudinal sectional view of a mesh-like cover layer according to an embodiment of the present invention;

fig. 7 is a schematic view of a mesh-like cover layer according to an embodiment of the present invention;

fig. 8 is a schematic bottom view of an edge portion according to an embodiment of the present invention;

fig. 9 is a schematic longitudinal sectional view of an edge portion according to an embodiment of the present invention;

fig. 10 is a schematic view of a reflection unit according to an embodiment of the present invention;

fig. 11 is a schematic view of a reflection unit according to an embodiment of the present invention;

fig. 12 is a schematic view of a mesh-like cover layer according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Fig. 1 is a schematic structural view of an ultrasonic anemometer according to an embodiment of the present invention.

As shown in fig. 1, the ultrasonic anemometer includes:

a transmitter 110 for transmitting ultrasonic waves;

a receiver 120 for receiving the reflected ultrasonic waves;

a reflection unit 130 for reflecting the ultrasonic wave from the transmitter 110 and allowing the reflected ultrasonic wave to be received by the receiver 120.

In fig. 1, the transmitter 110 and the receiver 120 are not visible in a particular position due to obstruction. The transmitter 110 and the receiver 120 correspond to the reflection unit position.

Fig. 2 is a schematic view of a reflection unit according to an embodiment of the present invention, and as shown in fig. 2, the reflection unit includes a reflection plate 210 and a mesh-shaped cover layer 220, and the mesh-shaped cover layer 220 covers an upper surface of the reflection plate 210.

Ultrasonic anemometers are usually used outdoors, and raindrops may be on the reflecting plate. Fig. 3 is a schematic view showing raindrops falling on a reflection plate. As shown in fig. 3, in the prior art, the raindrops have a hemispherical shape due to the surface tension.

Surface tension, which is the tension applied to any boundary along the surface of a liquid surface layer due to an imbalance in molecular attraction. Generally, the force is different between molecules at the interface and molecules within the body. In the body, i.e. inside the liquid, one water molecule receives zero resultant of the forces of the surrounding water molecules, but the water molecules at the surface of the liquid are different. Air is above the liquid surface, the attraction of gas phase molecules to interface water molecules is smaller than that of liquid phase molecules in the liquid, so the resultant force on the interface water molecules is not zero, the direction of the resultant force is vertical to the liquid surface and points to the inside of the liquid, and the liquid surface has the tendency of automatic shrinkage, and the shrinkage force is called as surface tension.

Due to the surface tension of the liquid, the raindrops may be hemispherical, that is, the raindrops may be higher than the plane of the reflective plate, and the hemispherical liquid may not immediately flow away due to the attraction force, friction force, etc. between the liquid molecules and the reflective plate molecules, and may become larger as the liquid dropping on the reflective plate is more, which may generate more liquid accumulation on the reflective plate. Even if the reflecting plate can make a certain inclination angle physically, the problem of liquid loading on the reflecting plate still cannot be solved.

More and more liquid is piled up on the reflecting plate, and because a certain angle can be formed between the reflecting plate and the horizontal plane, the liquid on the reflecting plate flows out from the edge of the reflecting plate under the action of gravity. However, the reflector plate is not completely non-hydrophilic, so that the liquid flowing through leaves a "water mark" on the reflector plate, and the "water mark" may also be discontinuous.

The hydrophilicity of a substance means that the substance has polar group-containing molecules, has a large affinity for water, and can attract water molecules or dissolve in water. In short, the substance and water have a large attractive force, so that the liquid, if it flows away, will partially adhere to the reflecting plate, leaving a mark.

FIG. 4 is a schematic view showing water marks. As shown in fig. 4, in practice, the water mark is discontinuous under various actions of gravity, hydrophilicity, friction, etc., which results in that the path of the liquid flowing out of the reflecting plate may be random after the next first liquid accumulation.

The raindrop landing has certain momentum, the momentum enables the raindrop to land on the reflecting plate to generate a sputtering phenomenon, namely, a plurality of small water drops can be splashed, the falling point of the small water drops is random, and the randomness of the falling point of the raindrop on the reflecting plate is higher during rainfall.

This randomness may make the ultrasonic anemometer unable to reduce or eliminate the effect of liquid accumulation on the reflective plate on the measurement result by a predetermined algorithm, a predetermined means.

The refractive index, reflectivity and absorptivity of water are different from those of air and from those of the plane of the reflector plate, and due to the existence of water drops higher than the plane and random accumulation of the water drops on the reflecting surface, the water drops are random in shape and random in height, which may cause the ultrasonic path to be changed from reflection to scattering, resulting in the reduction of the amplitude of the echo signal, and the change of the distance of the reflection path resulting in the wrong detection result, resulting in the poor error of the detected wind speed.

In the prior art, in order to solve the above problems, a non-hydrophilic, i.e., waterproof, nano-coating is applied on the upper surface of the reflective plate.

The nano coating is a non-hydrophilic substance, namely the attraction between the nano material and water molecules is small, so that the nano coating is coated on the reflecting plate, and the accumulation of the water molecules on the reflecting plate can be reduced.

However, to ensure that the liquid does not accumulate on the reflecting plate completely or mostly, the requirement for coating the nano material is high, and machine coating is usually needed to meet the requirement. However, when the ultrasonic anemometer is used outdoors and installed and leaves a factory, the reflecting plate can be coated with the nano coating by a machine, but the service life of the nano coating is limited, the effect is reduced about two weeks, the effect can be completely lost in two or three months, and at the moment, if the machine is continuously used for coating the nano coating, the reflecting plate needs to be returned to the factory, so that the cost is extremely high. If manually applied, the effect will be reduced.

In addition, the cost of the nano coating is high, so that the method adopting the nano coating in the prior art cannot solve the problem of cost and the problem of accuracy of a detection result.

The reflecting unit shown in fig. 2 of the present invention is covered with a mesh-like covering layer 220 on the upper surface of the reflecting plate 210. Fig. 5 is a top view of a mesh-type cover layer according to an embodiment of the present invention, and as shown in fig. 5, the mesh-type cover layer may include mesh lines 510 and meshes 520.

The condition of raindrops 530 dropping on the mesh cover is shown in fig. 5.

In practice, the diameter of the raindrops in nature is much larger than the size of one mesh of the mesh-like cover layer of the embodiment of the present invention, which is larger and smaller for a more clear schematic representation in fig. 5.

Fig. 6 is a schematic longitudinal sectional view of a mesh-like cover layer according to an embodiment of the present invention. As shown in fig. 6, the mesh-like cover layer has a certain thickness, and the size of the mesh is much smaller than the diameter of the raindrops but larger than the diameter of water molecules, so that the raindrops are applied with different forces at different positions when falling on the mesh-like cover layer. At grid line 610, the liquid is supported upward by the grid line 610 and gravity, and at grid 620, the liquid is subjected to gravity only.

The diameter of the water molecules is far smaller than the size of the grid, so the water molecules in the liquid in the grid have the tendency of dropping downwards under the action of gravity. As the raindrops are accumulated on the mesh-like cover layer, and since the mesh lines of the mesh-like cover layer have a certain thickness, a part of the raindrops located on the mesh may fall below the surface of the mesh-like cover layer, i.e., below the dotted line 600 shown in fig. 6.

A part of the raindrops falls below the surface of the mesh-like cover layer, which destroys the surface tension of the water drops, so that the raindrops fall on the reflecting unit and are dispersed more quickly than in the absence of the mesh-like cover layer, and the raindrops are dispersed more evenly, with less influence on the reflection of the ultrasonic waves.

It can be seen that, in the embodiment of the utility model, set up netted overburden on the reflecting plate, can make the faster dispersion of raindrop, avoid the raindrop accumulational too high on the reflecting plate to reduce the influence of raindrop to ultrasonic reflection, can improve the accuracy and the accuracy of ultrasonic anemoscope.

In practice, the raindrops fall with a certain momentum, which makes the raindrops in the scene as shown in fig. 6, and the grid 620 is also influenced by inertia, and falls under the surface of the mesh-shaped covering layer faster, and is dispersed more quickly. At this time, there is also sputtering, but the sputtered droplets have momentum and fall under the surface of the mesh-like cover layer more quickly.

Therefore, in the embodiment of the present invention, the mesh-shaped covering layer can disperse raindrops more quickly in practical applications.

The embodiment of the utility model provides an in, set up netted overburden on the reflecting plate, can not influence the reflection of reflection unit to ultrasonic.

Generally, it is considered that the flatter the surface, the better the reflection of ultrasonic waves, light waves, electromagnetic waves, etc., and the better the detection result, but the non-flat surface does not affect the final detection result for different testing devices.

The embodiment of the utility model provides an in, set up netted overburden on the reflecting plate, this reflection plane that leads to ultrasonic wave becomes unevenness, but in ultrasonic anemometer, the outgoing diameter of transmitter is centimetre rank, because the transmitter is oblique emission again, and the ultrasonic wave of transmission has certain dispersibility, so the reflection spot of ultrasonic wave on the reflecting plate still needs bigger a little. And the size and the thickness of the net of netted overburden are 0.1 millimeter or less, and the gridlines can reflect the ultrasonic wave, and the reflecting plate in the net also can launch the ultrasonic wave, even there is diffuse reflection's production, but the utility model discloses the reflection unit of embodiment still can reflect most ultrasonic wave.

In the embodiment of the present invention, the path length of the ultrasonic wave is above 5CM, and the path change caused by the thickness of the mesh-like cover layer on the reflection plate is only 0.1 mm, and the path error rate is less than 0.2%. The ultrasonic anemometer detects the wind speed and the wind direction by utilizing ultrasonic waves and is carried out according to the time difference generated by the path, and the influence of the mesh-shaped covering layer on the time difference is small; and if the mesh size and the thickness of the mesh-shaped covering layer are determined, the influence on the reflected ultrasonic waves is determinable or estimable, so that the influence caused by the mesh-shaped covering layer in the detection result can be corrected, and the detection result of the ultrasonic anemometer cannot be influenced even if the mesh-shaped covering layer is arranged.

In the embodiment of the utility model, the upper surface of reflecting plate is middle bellied cambered surface.

Adopt the bellied cambered surface of central authorities, can make and have certain angle between the upper surface of whole reflecting plate and the horizontal plane to accelerate the flow velocity of liquid, make the faster scattering of liquid that falls on the reflection unit and flow, thereby reduce the thickness of reflection unit on the surface hydrops, reduce the influence of hydrops to the testing result, improve the accuracy and the accuracy of ultrasonic anemometer.

In an embodiment of the present invention, there is a gap between the mesh-like cover layer and the reflection plate.

In the embodiment of the present invention, the mesh-like cover layer covers the reflective plate instead of closely adhering to the reflective plate, so that a gap exists between the mesh-like cover layer and the reflective plate. As shown in fig. 6, the existence of the gap between the mesh-shaped cover layer and the reflective plate may mean that there is a gap between the mesh lines 610 of the mesh-shaped cover layer and the reflective plate.

Although such gaps may be small, they are large enough for water molecules to pass through, relative to the volume of water molecules, so that there is a gap between the mesh-like cover layer and the reflector plate to facilitate the flow of liquid, allowing the liquid to flow out as quickly as possible.

In addition, the existence of gaps between the mesh-like cover layer and the reflecting plate can break the balance of the surface tension of the liquid, so that the liquid is dispersed more quickly.

Neither the reflector plate nor the mesh cover layer are completely non-hydrophilic, so raindrops may be wetting liquids for both. Therefore, rainwater can be attached to the mesh-shaped covering layer and/or the reflecting plate, the existence of the gaps and the existence of attraction among water molecules of liquid enable the liquid falling into the meshes to be attached to the mesh lines, and the water molecules of the liquid in the mesh lines and the gaps can also be attracted to the water molecules of the liquid in the meshes, so that the water molecules can be attracted to flow out along the gaps more quickly.

It is thus clear that netted overburden with there is the clearance can accelerate the scattering and the outflow of liquid between the reflecting plate to reduce the thickness of the hydrops on the reflecting unit surface, reduce the influence of hydrops to the testing result, improve the accuracy and the accuracy of ultrasonic anemometer.

The embodiment of the utility model provides an in, the raindrop all can be infiltration liquid to reflecting plate and netted overburden, and there is the clearance between netted overburden and the reflecting plate, this makes liquid can disperse between netted overburden and reflecting plate, initial time (when just beginning to fall rain), the raindrop falls on netted overburden, can pile up temporarily, but disperse soon, and get into the clearance between netted overburden and the reflecting plate, again because hydrophilicity, so can have a certain amount of liquid between netted overburden and the reflecting plate, but these liquid are dispersed. Raindrops continuously fall on the surface of the reflecting unit, and the presence of liquid between the mesh-like cover layer and the reflecting plate causes the raindrops to be more rapidly dispersed and to enter the gap due to the attractive force between water molecules in the liquid.

The liquid between the mesh-like cover layer and the reflector plate will be present for a certain time, and at this time, if the mesh-like cover layer is lightly pressed by hand, the liquid will seep out.

Compared with the reflecting plate without the mesh-shaped covering layer, a part of liquid is reserved between the mesh-shaped covering layer and the reflecting plate, so that obvious 'water marks' and disconnected 'water marks' are not existed on the reflecting surface of the ultrasonic wave, and the liquid continuously drops on the reflecting unit and is dispersed and enters the gap more quickly instead of flowing towards an indefinite direction like the reflecting plate without the mesh-shaped covering layer. This makes in the ultrasonic anemometer of the embodiment of the present invention, a lot of uncertainties are reduced.

In an embodiment of the present invention, the mesh-like cover layer and there is a gap between the reflective plates, include:

The reflecting plate is a cambered surface with a convex middle part, if the reticular covering layer is a plane, or the radian of the reticular covering layer is different from that of the reflecting plate, the reticular covering layer and the reflecting plate can be in contact at the middle part, but the gaps are slightly larger outside the middle part, and the gaps can be regarded as liquid channels.

The existence of liquid channel can accelerate the scattering and the outflow of liquid to reduce the thickness of the hydrops on the surface of the reflection unit, reduce the influence of the hydrops on the detection result, and improve the accuracy and the precision of the ultrasonic anemometer

Fig. 7 is a schematic view of a mesh-type cover layer according to an embodiment of the present invention, and as shown in fig. 7, an edge 710 is formed at an edge of the mesh-type cover layer 700. The edge portion 710 is in contact with the reflection plate 100, and the thickness of the edge portion 710 is greater than that of the mesh-shaped cover layer 700, so that a gap exists between the mesh-shaped cover layer 700 and the reflection plate 100.

Because water is the infiltration liquid to netted overburden and reflecting plate, liquid flow between netted overburden and reflecting plate can lead to netted overburden to hug closely the reflecting plate more and more, make the clearance between netted overburden and the reflecting plate diminish, and the edge portion can make and keep the clearance between netted overburden and the reflecting plate, thereby the scattering of liquid is accelerated, reduce the thickness of the hydrops on the reflecting unit surface, reduce the influence of hydrops to the testing result, improve ultrasonic anemometer's accuracy and accuracy.

In an embodiment of the present invention, there is a liquid channel between the mesh-like cover layer and the reflection plate, include:

Fig. 8 is a schematic bottom view of an edge portion according to an embodiment of the present invention, the edge portion including a plurality of first edge portions 810 and a plurality of second edge portions 820. Fig. 9 is a schematic longitudinal sectional view of an edge portion according to an embodiment of the present invention.

Referring to fig. 8 and 9, the thicknesses of the first edge portion 810 and the second edge portion 820 are greater than the thickness of the mesh-like cover layer (hidden in fig. 9, not shown), the thicknesses of the first edge portion 810 and the second edge portion 820 are different, and the first edge portion 810 and the second edge portion 820 are spaced apart from each other.

The presence of the edge portion allows a gap between the mesh-like cover layer and the reflection plate to be maintained, and allows a liquid passage between the mesh-like cover layer and the reflection plate to be maintained.

The liquid channel can accelerate the scattering and the outflow of liquid to reduce the thickness of the hydrops on the surface of the reflection unit, reduce the influence of the hydrops on the detection result, and improve the accuracy and the precision of the ultrasonic anemometer.

In the embodiment of the present invention, the mesh-like covering layer is made of a material with high reflectivity to ultrasonic waves.

The mesh covering layer is made of a material with high reflectivity to ultrasonic waves, so that the power of reflected ultrasonic waves can be improved, and the accuracy and the precision of the ultrasonic anemometer are improved.

In the embodiment of the present invention, the mesh-like covering layer is made of metal material, such as stainless steel, or may be made of other fiber material.

In the embodiment of the present invention, the mesh-like covering layer is made of water-impregnated material.

In an embodiment of the present invention, the area of the mesh-shaped cover layer is smaller than or equal to the area of the reflective plate.

In fact, the edge portion of the reflecting plate is not required to reflect the ultrasonic wave, and therefore the area of the mesh-like cover layer is smaller than that of the reflecting plate, and the cost can be reduced.

In an embodiment of the invention, the mesh-like cover layer is provided with at least two fixing points, the fixing points are used for bonding the mesh-like cover layer on the reflecting plate.

In the embodiment of the utility model provides an in, still be provided with the support column on the upper surface of reflecting plate, be used for making the reflecting plate with the ultrasonic wave anemometer is connected. In the embodiment of the present invention, the fixing point is set in a position corresponding to the supporting column.

Fig. 10 is a schematic view of a reflection unit according to an embodiment of the present invention, as shown in fig. 10, a support column 1010 is further disposed on the reflection plate, 4 support columns 1010 are disposed in fig. 10, the fixing points are welded, and the number of the fixing points exceeds the number of the support columns.

In other embodiments of the present invention, the number of the fixed points may be 4, and each fixed point is disposed at the position of the supporting column.

The space between the reflecting plate and the supporting columns is used for the passing of the air/wind to be tested, so that the number of the supporting columns cannot be too large, otherwise, the air can be blocked, the test result is influenced, and similarly, the fixing points are not too many and cannot be too prominent, so that the air is prevented from being blocked.

In the embodiment of the utility model provides an in, the fixed point is the sticky of adoption.

The embodiment of the utility model provides an in, between fixed point and the reflecting plate, it is fixed also to adopt the welded mode.

In an embodiment of the present invention, the fixing point is disposed on an edge portion of the mesh-like cover layer.

In the embodiment of the utility model provides an in, be provided with the bayonet socket that sinks on the reflecting plate, netted overburden is through inserting sink the bayonet socket, with the reflecting plate links to each other.

Fig. 11 is a schematic view of a reflection unit according to an embodiment of the present invention, as shown in fig. 11, two sinking bayonets are provided on a reflection plate of the reflection unit, and the edge portion of the mesh-shaped cover layer can be directly clamped into the sinking bayonets to be fixed on the mesh-shaped cover layer.

In the embodiment of the present invention, the mesh-like covering layer can be fixed to the reflective plate through other structures, which is not repeated herein.

In the embodiment of the present invention, the grid of the mesh-like covering layer may be a square grid as shown in fig. 5, or may be a circle, or a triangle, or a hexagon, etc. The mesh-like covering layer may be a metal sheet with a porous shape, as shown in fig. 12, or other thin layers with grid lines and meshes formed integrally, and will not be described in detail herein.

The utility model discloses the reflection unit can accelerate scattering of liquid to reduce the thickness of reflection unit hydrops on the surface, reduce the influence of hydrops to the testing result, improve the accuracy and the accuracy of ultrasonic anemometer.

The embodiment of the utility model provides an in, netted overburden or can not contain the edge part, and netted overburden can have certain hardness this moment, can make and keep certain clearance between netted overburden and the reflecting plate.

In the embodiment of the present invention, if the mesh-like covering layer does not include an edge portion, the fixing point can be directly disposed on the edge portion of the mesh-like covering layer. The fixing point may be an adhesive bond or may be a weld.

The embodiment of the utility model provides an in, netted overburden or can have certain radian, the radian of netted overburden is different with the radian of reflection version, also can make and keep certain clearance between netted overburden and the reflecting plate.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is only exemplary of the invention, and is intended to enable those skilled in the art to understand and implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An ultrasonic anemometer comprising:

a transmitter for transmitting ultrasonic waves;

a reflection unit for reflecting the ultrasonic wave from the transmitter;

a receiver for receiving the reflected ultrasonic waves;

2. The ultrasonic anemometer of claim 1 wherein the upper surface of the reflector plate is a curved surface with a high middle and a low edge or a structure with a plane combined with an inclined surface.

3. The ultrasonic anemometer of claim 1 wherein a gap exists between the mesh overlay and the reflector plate.

4. The ultrasonic anemometer of claim 3 wherein a gap exists between the mesh overlay and the reflector plate, comprising:

a liquid passage exists between the mesh-like cover layer and the reflection plate, so that the liquid flows out of the reflection unit through the liquid passage.

5. The ultrasonic anemometer of claim 3 wherein a gap exists between the mesh overlay and the reflector plate, comprising:

6. The ultrasonic anemometer of claim 5 wherein a fluid passage exists between the mesh covering layer and the reflector plate, comprising:

7. The ultrasonic anemometer of claim 1 wherein the mesh covering is made of a material that is highly reflective of ultrasonic waves.

8. The ultrasonic anemometer of claim 1 wherein the mesh overlay is made of a water-wettable material.

9. An ultrasonic anemometer according to claim 1 wherein the mesh covering is provided with at least two fixing points for gluing and/or welding the mesh covering to the baffle.

10. The ultrasonic anemometer of claim 1 wherein said reflector plate is provided with a sunken bayonet, and said mesh-like cover layer is attached to said reflector plate by being inserted into said sunken bayonet.