CN220912377U - Rectifier and ultrasonic flowmeter - Google Patents

Abstract

The utility model discloses a rectifier and an ultrasonic flowmeter, wherein the ultrasonic flowmeter is provided with a metering flow channel, the rectifier is arranged at the inlet end of the metering flow channel, the rectifier is provided with a cavity, one end of the cavity, which is opposite to the metering flow channel, is blocked, the rectifier is provided with a plurality of air inlets which are uniformly and alternately arranged along the circumferential direction of the rectifier, the air inlets are communicated with the cavity, one end of a shell, which faces the metering flow channel, is provided with a rectifying plate, a plurality of air outlets which are arranged in an array are arranged on the rectifying plate, and the cavity is communicated with the metering flow channel through the air outlets. According to the rectifier provided by the utility model, the airflow entering the metering flow channel can be rectified twice, so that the flow field distribution and the flow velocity distribution uniformity of the airflow in the metering flow channel are fully improved, and the metering accuracy of the ultrasonic flowmeter is further improved to a greater extent.

Description

Rectifier and ultrasonic flowmeter

Technical Field

The utility model relates to the technical field of fluid flow measurement, in particular to a rectifier and an ultrasonic flowmeter.

Background

An ultrasonic flow meter is a gas meter that measures the flow rate of gas by detecting the flow rate of gas in an ultrasonic metering flow channel, in which the degree of accuracy of the metering result is greatly affected by whether the flow field of gas in the metering flow channel is uniform.

And because the actual gas meter installation environment is complex, when the installation environment is changed or the gas meter air inlet is disturbed, the flow field in the metering flow channel is easily changed, so that the flow velocity in the metering flow channel is unevenly distributed, and the metering precision of the gas meter is affected. It is therefore desirable to provide a solution that enables a more uniform distribution of the air flow within the metering channel.

Disclosure of utility model

The utility model provides a rectifier and an ultrasonic flowmeter, wherein an air inlet hole which is uniformly distributed and communicated with a cavity is formed in the peripheral wall of the rectifier, one end, far away from a metering flow channel, of the rectifier is blocked, and a rectifying plate is arranged towards one end of the metering flow channel, so that the rectifier can enter air from all directions on the peripheral side, primary rectification is realized, and secondary rectification is carried out when air flows pass through the rectifying plate, thereby improving the flow field distribution and the flow velocity distribution uniformity of the air flows in the metering flow channel and improving the metering precision of the ultrasonic flowmeter.

The utility model provides a rectifier which is used for an ultrasonic flowmeter and is provided with a metering flow channel, wherein the rectifier is arranged at the inlet end of the metering flow channel and is provided with a cavity, one end of the cavity, which is opposite to the metering flow channel, is blocked, the rectifier is provided with a plurality of air inlets which are uniformly and alternately arranged along the circumferential direction of the rectifier, the air inlets are communicated with the cavity, one end of the rectifier, which faces the metering flow channel, is provided with a rectifying plate, a plurality of air outlets which are arranged in an array are arranged on the rectifying plate, and the cavity is communicated with the metering flow channel through the air outlets.

According to the rectifier, the air inlets which are uniformly distributed and communicated with the cavity are formed in the peripheral wall, one end, far away from the metering flow channel, of the rectifier is plugged, and the rectifying plate is arranged towards one end, far away from the metering flow channel, of the rectifier, so that the rectifier can enter air from all directions on the peripheral side, primary rectification is achieved, secondary rectification is achieved when air flows pass through the rectifying plate, and through the mutual matching of the air inlets and the air outlets, the air flows entering the metering flow channel can be rectified twice, the influence of installation environment and air inlet disturbance on the uniformity of air flow distribution in the metering flow channel is greatly reduced, the uniformity of flow field distribution and flow velocity distribution of the air flows in the metering flow channel is fully improved, and further the metering precision of the ultrasonic flowmeter is greatly improved. And the whole structure of the rectifier is simpler and easy to manufacture.

In some embodiments, the plurality of air outlet holes are arranged in a plurality of rows and a plurality of columns, wherein the air outlet holes of any two adjacent columns are staggered in the height direction, and the air outlet holes of any two adjacent rows are staggered in the horizontal direction.

In some embodiments, the sum of the areas S2 of all the air outlet holes and the flow area S1 of the metering flow channel satisfy: s2= (0.9-1.1) S1.

In some embodiments, the air outlet holes are at least one of round holes and honeycomb holes.

In some embodiments, the rectifier includes: the shell is opened at two ends of the shell along the axial direction of the metering flow channel, a plurality of air inlets are formed in the peripheral wall of the shell, and the rectifying plate is arranged at one end of the shell facing the metering flow channel; the cover body is arranged at one end of the shell, which is opposite to the metering runner.

In some embodiments, the flow area of at least a portion of the structure of the housing increases gradually in a direction along the axial direction of the metering flow channel and away from the metering flow channel.

In some embodiments, the outer walls of two opposite sides of the housing are respectively provided with a first connection structure, the cover body is provided with a first connection matching structure, and the first connection matching structure is detachably connected with the first connection structure.

In some embodiments, the first connection structure is a first connection protrusion, a first fastening hole is formed on the first connection matching structure, and the first connection matching structure is adapted to be fastened to the first connection protrusion.

In some embodiments, the projection of the air inlet hole in the reference plane extends along the axial direction of the metering flow channel, the reference plane is parallel to the axis of the metering flow channel, and the value range of the length-width ratio of the air inlet hole is: a/b is more than or equal to 5, wherein a is the length of the air inlet hole, and b is the width of the air inlet hole.

In a second aspect of the present utility model, an ultrasonic flow meter comprises: a metering body defining the metering flow channel; according to the rectifier of the first aspect of the utility model, the rectifier is arranged at the inlet end of the metering flow channel and is connected with the metering main body.

According to the ultrasonic flowmeter of the utility model, the rectifier in the embodiment is arranged at the inlet end of the metering main body, so that the flow field distribution of airflow in the metering flow channel and the uniformity of flow velocity can be improved, and the metering accuracy of the ultrasonic flowmeter can be improved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.

Wherein:

FIG. 1 is a schematic view of an ultrasonic flow meter according to an embodiment of the present utility model;

FIG. 2 is an exploded view of an ultrasonic flow meter according to an embodiment of the present utility model;

FIG. 3 is a schematic structural diagram of an embodiment of a rectifier according to an embodiment of the present utility model, in which an air outlet hole of the rectifier is a circular hole;

FIG. 4 is a schematic diagram of another embodiment of a rectifier according to an embodiment of the present utility model, in which the air outlet holes of the rectifier are hexagonal holes;

FIG. 5 is a side view of a housing according to an embodiment of the utility model;

FIG. 6 is a top view of a housing according to an embodiment of the present utility model;

FIG. 7 is a schematic view of an angle of a cover according to an embodiment of the utility model;

FIG. 8 is a schematic view of another angle of the cover according to an embodiment of the utility model;

FIG. 9 is a schematic view of the structure of a metering body according to an embodiment of the present utility model;

Fig. 10 is a cross-sectional view taken along section A-A in fig. 9.

Reference numerals illustrate:

100-an ultrasonic flowmeter;

1-a metering body;

11-metering flow channel; 111-a subchannel; 12-a second connection structure; 121-a second side; 13-a separator;

A 2-rectifier;

21-a housing;

210-a cavity;

211-a connection section; 2111-a second connection mating structure; 2112-second buttonhole;

212-rectifying section; 2121-an air inlet;

213-a mounting section; 2131-a first connection structure; 2132-a second surface;

22-cover; 221-a first connection mating structure; 222-a first button hole;

23-rectifying plates; 231-air outlet holes.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

An ultrasonic flow meter is a gas meter that measures the flow rate of gas by detecting the flow rate of gas in an ultrasonic metering flow channel, in which the degree of accuracy of the metering result is greatly affected by whether the flow field of gas in the metering flow channel is uniform. And because the actual gas meter installation environment is complex, when the installation environment is changed or the gas meter air inlet is disturbed, the flow field in the metering flow channel is easily changed, so that the flow velocity in the metering flow channel is unevenly distributed, and the metering precision of the gas meter is affected. It is therefore desirable to provide a solution that enables a more uniform distribution of the air flow within the metering channel.

In view of the above, the present utility model provides a rectifier and an ultrasonic flowmeter, in which, through providing air inlet holes uniformly distributed on the peripheral wall and communicating with the cavity, and plugging one end of the rectifier far away from the metering flow channel, and providing a rectifying plate towards one end of the metering flow channel, the rectifier can enter air from all directions on the peripheral side, so as to realize primary rectification, and perform secondary rectification when the air flow passes through the rectifying plate, thereby improving the flow field distribution and the uniformity of flow velocity distribution of the air flow in the metering flow channel, and improving the metering accuracy of the ultrasonic flowmeter.

A rectifier 2 according to an embodiment of the first aspect of the utility model is described below with reference to fig. 1-10.

The rectifier 2 of the embodiment of the utility model can be used for an ultrasonic flowmeter 100, the ultrasonic flowmeter 100 is provided with a metering flow channel 11, and when air flows through the metering flow channel 11, the ultrasonic flowmeter 100 can accurately calculate the flow of the air flowing through. For example, the ultrasonic flow meter 100 may include a metering body 1 and a rectifier 2, the metering flow channel 11 may be formed on the metering body 1, and the rectifier 2 may be provided at an inlet end of the metering flow channel 11 so as to rectify an air flow entering the metering flow channel 11, thereby adjusting flow field distribution of the air flow so as to improve metering accuracy of the ultrasonic flow meter 100.

Specifically, the rectifier 2 has a cavity 210, the cavity 210 is communicated with the metering flow channel 11, one end of the cavity 210 facing away from the metering flow channel 11 is blocked, the rectifier 2 has a plurality of air inlet holes 2121, the plurality of air inlet holes 2121 are uniformly and alternately arranged on the peripheral wall of the rectifier 2 along the circumferential direction of the rectifier 2, and the air inlet holes 2121 are communicated with the cavity 210. The rectifier 2 still is equipped with the rectification board 23 towards the one end of measurement runner 11, and the rectification board 23 is located between cavity 210 and the measurement passageway promptly, is equipped with a plurality of ventholes 231 on the rectification board 23, and the venthole 231 can be followed the thickness direction of rectification board 23 and run through, and a plurality of ventholes 231 are the array and arrange, and cavity 210 can be through a plurality of ventholes 231 and measurement runner intercommunication. In this way, when the ultrasonic flowmeter 100 is in operation, the air flow to be measured can enter the metering channel 11 from the peripheral side of the rectifier 2 via the air inlet 2121, the chamber 210, and the air outlet 231 in this order.

For example, as shown in fig. 2, the cross section of the metering flow channel 11 is formed into a square shape, and the cross section of the rectifier 2 is also formed into a square shape, in other words, the cross section shape of the rectifier 2 is adapted to the cross section shape of the metering flow channel 11, so as to butt-joint the outlet of the cavity 210 with the metering flow channel 11, realize smooth transition between the inner wall of the cavity 210 and the inner wall of the metering flow channel 11, and reduce disturbance to air flow.

As can be appreciated, since the air inlet holes 2121 are uniformly distributed in the circumferential direction in the rectifier 2, air can be introduced into any side in the circumferential direction, so that air flow is distributed more uniformly in the cavity 210, and since the cavity 210 is opposite to the metering runner 11, the distribution uniformity of the air flow after entering the cavity 210 can be improved, and primary rectification of the air flow is realized. When the air flows through the air outlet 231, the rectifying plate 23 can diffuse the air flowing into the metering channel 11 from the cavity 210, so that the diffused air uniformly flows into the metering channel 11, and the second rectification is realized.

According to the rectifier 2 of the embodiment of the utility model, through the arrangement of the air inlets 2121 which are uniformly distributed on the peripheral wall and are communicated with the cavity 210, and the end, far away from the metering flow channel 11, of the rectifier 2 is blocked, and the rectifying plate 23 is arranged towards the end of the metering flow channel 11, so that the rectifier 2 can enter air from all directions on the peripheral side, primary rectification is realized, secondary rectification is realized when air flows pass through the rectifying plate 23, the air flows entering the metering flow channel 11 can be rectified twice through the mutual matching of the air inlets 2121 and the air outlets 231, the influence of the installation environment and air inlet disturbance on the distribution uniformity of the air flows in the metering flow channel 11 is greatly reduced, the flow field distribution and the flow velocity distribution uniformity of the air flows in the metering flow channel 11 are fully improved, and the metering accuracy of the ultrasonic flowmeter 100 is further greatly improved. In addition, the rectifier 2 has a simple overall structure and is easy to manufacture.

In some embodiments, the plurality of air outlet holes 231 are arranged in a plurality of rows and a plurality of columns, wherein the air outlet holes 231 of any two adjacent columns are staggered in the height direction, and the air outlet holes 231 of any two adjacent rows are staggered in the horizontal direction. In this way, the space utilization rate on the rectifying plate 23 can be improved, and the open area can be increased to the greatest extent, so as to ensure the uniformity of the distribution of the air flow in the metering flow channel 11.

In some embodiments, the sum of the areas S2 of all the air outlet holes 231 and the flow area S1 of the metering channel 11 satisfy: s2= (0.9-1.1) ×s1, in other words, the ratio of the sum S2 of the areas of all the air outlet holes 231 to the flow area S1 of the metering flow channel 11 ranges from 0.9 to 1.1, for example, the ratio of the sum S2 of the areas of all the air outlet holes 231 to the flow area S1 of the metering flow channel 11 may be 0.9, 1 or 1.1, which may be reasonably selected according to the actual requirement within the above range, so that the open area of the rectifying plate 23 is similar to the area of the section of the metering flow channel 11, and the pressure loss problem caused by dense open holes may be reduced.

In some embodiments, referring to fig. 3, the air outlet aperture 231 is at least one of a circular aperture, a honeycomb aperture. For example, the air outlet hole 231 may be a circular hole, or referring to fig. 4, the air outlet hole 231 may be a honeycomb hole, that is, a hexagonal hole, which is not limited in the present utility model, and the air outlet hole 231 may be configured into other shapes according to actual needs to meet the requirement of secondary rectification, so that the rectifying plate 23 has various structures and can better meet the use requirement.

In some embodiments, referring to fig. 2, the rectifier 2 may include: a housing 21 and a cover 22. Specifically, the two ends of the housing 21 along the axial direction of the metering flow channel 11 are open, the plurality of air inlet holes 2121 are formed in the peripheral wall of the housing 21, the rectifying plate 23 is disposed at one end of the housing 21 facing the metering flow channel 11, and the cover 22 is disposed at one end of the housing 21 along the axial direction of the metering flow channel 11, which is far away from the metering flow channel 11, so that the cover 22 and the housing 21 can define the cavity 210 together. In this way, the overall structure of the rectifier 2 is relatively simple and easy to manufacture and assemble.

In some embodiments, referring to fig. 2 and fig. 5 and 6, in the direction along the axial direction of the metering flow channel 11 and away from the metering flow channel 11, the flow area of at least part of the structure of the housing 21 gradually increases, for example, the housing 21 may be formed in a flare shape in which the sectional area gradually increases as a whole, or only part of the structure may be formed in a flare shape in which the sectional area gradually increases. By configuring the housing 21 in a flare shape, a speed difference between the edge and the center of the cavity 210 can be reduced, and preliminary rectification can be achieved.

For example, as shown in fig. 5, the housing 21 may include a connection section 211, a rectification section 212, and a mounting section 213, the connection section 211, the rectification section 212, and the mounting section 213 being sequentially arranged and connected in an axial direction of the metering flow channel 11, wherein the connection section 211 is for connection with the metering body 1 of the ultrasonic flow meter 100, a plurality of air intake holes 2121 may be formed in a peripheral wall of the rectification section 212, and the mounting section 213 may be for mounting the cover 22. In the direction along the axial direction of the metering flow channel 11 and away from the metering flow channel 11, the flow areas of the connecting section 211 and the mounting section 213 are equal, and the flow area of the connecting section 211 is smaller than the flow area of the mounting section 213, and the flow area of the rectifying section 212 is gradually increased. In this way, the overall construction of the housing 21 is relatively simple and easy to manufacture and assemble.

In some embodiments, referring to fig. 2, the outer walls of opposite sides of the housing 21 are respectively provided with a first connection structure 2131, the cover 22 is provided with a first connection fitting structure 221, the first connection fitting structure 221 is adapted to the first connection structure 2131, and the first connection fitting structure 221 is detachably connected to the first connection structure 2131. For example, the first connection structure 2131 and the first connection mating structure 221 may be one of a plug-in mating, a snap-fit mating or a screw-thread mating, which is not limited to this, and the first connection structure 2131 and the first connection mating structure 221 may be other mating forms, so that the mating manner of the housing 21 and the cover 22 is simple and convenient for assembly or disassembly.

In other possible embodiments, the housing 21 and the cover 22 may be integrally formed, so that the assembly can be omitted and the overall structure is stronger.

In some embodiments, the first connecting structure 2131 is a first connecting protrusion, the first connecting fitting structure 221 is provided with a first fastening hole 222, and the first connecting fitting structure 221 is adapted to be fastened to the first connecting protrusion. For example, as shown in fig. 2, the cross section of the housing 21 is formed into a square shape, the first connecting protrusions may be formed on the left and right side walls of the mounting section 213 of the housing 21, the left and right side edges of the cover 22 are respectively formed with first connecting lugs extending toward the housing 21, the first connecting lugs form a first connecting fitting structure 221, the first connecting lugs are provided with first fastening holes 222 adapted to the first connecting protrusions, and when the housing 21 and the cover 22 are assembled, the first connecting protrusions may be fastened into the first fastening holes 222, so that stable connection of the two is achieved. In this way, the first connecting structure 2131 and the first connecting mating structure 221 are relatively simple in structure and easy to manufacture.

In some embodiments, referring to fig. 1 and 2 and fig. 7 and 8, the first connecting protrusion has a first surface and a second surface 2132 sequentially arranged and connected along an axial direction of the metering channel 11, wherein the first surface is perpendicular to a sidewall of the mounting section 213 of the housing 21, the second surface 2132 is located at a side of the first surface facing the cover 22, and the second surface 2132 extends obliquely outward in a direction along the axial direction of the metering channel 11 and from the cover 22 toward the housing 21 to be connected with an outer end of the first surface, so that, when the housing 21 and the cover 22 are assembled, the first connecting lug can be expanded outward while moving along the second surface 2132 until the first connecting protrusion is snapped into the first fastening hole 222, so that the first surface and an inner wall of the first fastening hole 222 form interference in the axial direction of the metering channel 11, and connection of the two can be achieved. In this way, the assembly process of the shell 21 and the cover 22 is more labor-saving, and meanwhile, the connection is more reliable.

In some alternative embodiments, the end face of the housing 21 facing the cover 22 may be provided with a sink, i.e. the end face of the mounting section 213 facing the cover 22 may be provided with a sink, and the cover 22 may be directly embedded into the sink, so as to achieve connection and cooperation with the housing 21, omitting the first connection structure 2131 provided on the housing 21 and the first connection and cooperation structure 221 provided on the cover 22, simplifying the overall structure, contributing to reducing the volume and reducing the manufacturing cost.

In some embodiments, referring to fig. 2 and fig. 5 and 6, the projection of the air intake aperture 2121 into the reference plane extends along the axial direction of the metering channel 11, the reference plane being parallel to the axis of the metering channel 11. In other words, the projected long side of the intake port 2121 in the reference plane is parallel to the axis of the metering channel 11, that is, the intake port 2121 is formed as an elongated hole, so that gas can flow substantially along the extending direction of the metering channel 11 when entering the cavity 210 from the intake port 2121.

In some embodiments, the air inlet 2121 is a square or rectangular hole, and the aspect ratio of the air inlet 2121 is in the range of: a/b is equal to or greater than 5, wherein a is the length of the air inlet 2121 and b is the width of the air inlet 2121. In this way, the length of the air inlet 2121 can be ensured, and the air flow can flow along the direction of the metering flow channel 11 while flowing along the opening direction of the air inlet 2121, so that the uniformity of the flow field distribution of the air flow in the cavity 210 can be improved.

An ultrasonic flow meter 100 according to an embodiment of the second aspect of the present utility model is described below.

Referring to fig. 1 and 2, the ultrasonic flowmeter 100 of the present embodiment can be used to calculate the gas flow rate, but can be used to calculate other fluid flow rates. Specifically, the ultrasonic flow meter 100 may include: a metering body 1 and a rectifier 2 in the above embodiment.

The metering main body 1 defines a metering flow channel 11, and the rectifier 2 is arranged at an inlet end of the metering flow channel 11 and is connected with the metering main body 1 so as to rectify air flow entering the metering flow channel 11, thereby adjusting flow field distribution of the air flow. When the airflow rectified by the rectifier 2 flows through the metering flow passage 11, the airflow can be accurately metered by the metering main body 1.

According to the ultrasonic flowmeter 100 of the embodiment of the present utility model, by providing the rectifier 2 in the above embodiment at the inlet end of the metering main body 1, the flow field distribution of the air flow in the metering flow channel 11 and the uniformity of the flow velocity can be improved, thereby contributing to the improvement of the metering accuracy of the ultrasonic flowmeter 100.

In some embodiments, referring to fig. 9 and 10, the metering body 1 is provided with a plurality of partitions 13, and the plurality of partitions 13 are arranged in parallel with each other and at intervals to divide the metering channel 11 into a plurality of sub-channels 111. That is, by providing the rectifier 2 in the above embodiment, the uniformity of the air flow distribution in each of the sub-channels 111 can be improved, thereby improving the accuracy of metering.

In some embodiments, referring to fig. 1 and 2, the outer walls of two opposite sides of the metering body 1 are respectively provided with a second connection structure 12, the housing 21 is provided with a second connection mating structure 2111, the second connection mating structure 2111 is adapted to the second connection structure 12, and the second connection mating structure 2111 is detachably connected to the second connection structure 12. For example, the second connection structure 12 and the second connection mating structure 2111 may be one of a plug-in mating, a snap-fit mating, or a screw-thread mating, which is not limited to this, and the second connection structure 12 and the second connection mating structure 2111 may be other mating forms, so that the mating manner of the metering body 1 and the rectifier 2 is simple and convenient for assembly or disassembly.

In some embodiments, the second connection structure 12 is a second connection protrusion, and the second connection fitting structure 2111 is provided with a second fastening hole 2112, and the second connection fitting structure 2111 is adapted to be fastened to the second connection protrusion. For example, as shown in fig. 2, the cross section of the metering runner 11 is formed into a square shape, second connection protrusions may be formed on the side walls of the left and right sides of the metering main body 1, and the edges of the left and right sides of the connection section 211 of the housing 21 are respectively formed with second connection lugs extending toward the metering main body 1, the second connection lugs form a second connection fitting structure 2111, and second fastening holes 2112 adapted to the second connection protrusions are formed on the second connection lugs, so that the second connection protrusions can be fastened into the second fastening holes 2112 when the rectifier 2 is assembled with the metering main body 1, thereby realizing stable connection of the rectifier 2 and the metering main body 1. In this way, the second connection structure 12 and the second connection fitting structure 2111 are relatively simple in structure and easy to manufacture.

In some embodiments, referring to fig. 1, the second connection protrusion has a first side surface and a second side surface 121 sequentially arranged and connected in the axial direction of the metering channel 11, wherein the first side surface is perpendicular to the sidewall of the metering body 1, the second side surface 121 is located at a side of the first side surface facing the rectifier 2, and the second side surface 121 extends obliquely outward in the axial direction of the metering channel 11 and in a direction from the rectifier 2 toward the metering body 1 to be connected with an outer end of the first side surface. In this way, when the rectifier 2 is assembled with the metering main body 1, the second connecting lug can move along the second side surface 121 and expand outwards until the second connecting protrusion is clamped into the second buckling hole 2112, so that the first side surface and the inner wall of the second buckling hole 2112 form interference in the axial direction of the metering runner 11, and connection between the first side surface and the second buckling hole 2112 can be achieved. In this way, the assembling process of the rectifier 2 and the metering main body 1 is more labor-saving, and meanwhile, the connection is more reliable.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. A rectifier is used for an ultrasonic flowmeter, which is characterized in that the ultrasonic flowmeter is provided with a metering flow channel, the rectifier is arranged at the inlet end of the metering flow channel,

The rectifier has the cavity, the cavity dorsad metering runner's one end shutoff, the rectifier has a plurality of inlet ports of following self circumference even and interval arrangement, the inlet port with the cavity intercommunication, the rectifier orientation metering runner's one end is equipped with the rectification board, be equipped with a plurality of ventholes that are the array and arrange on the rectification board, the cavity passes through the venthole with metering runner intercommunication.

2. The rectifier of claim 1 wherein a plurality of said air outlet holes are arranged in a plurality of rows and columns, wherein said air outlet holes of any two adjacent columns are staggered in a height direction and said air outlet holes of any two adjacent rows are staggered in a horizontal direction.

3. The rectifier according to claim 1, characterized in that the sum of the areas S2 of all the outlet holes and the flow area S1 of the metering channel satisfy: s2= (0.9-1.1) S1.

4. The rectifier of claim 1, wherein the air outlet holes are at least one of round holes and honeycomb holes.

5. The rectifier according to claim 1, characterized by comprising:

The shell is opened at two ends of the shell along the axial direction of the metering flow channel, a plurality of air inlets are formed in the peripheral wall of the shell, and the rectifying plate is arranged at one end of the shell facing the metering flow channel;

the cover body is arranged at one end of the shell, which is opposite to the metering runner.

6. The rectifier of claim 5 wherein the flow area of at least a portion of the structure of the housing increases gradually in a direction along the axial direction of the metering flow passage and away from the metering flow passage.

7. The rectifier of claim 5, wherein the outer walls of opposite sides of the housing are respectively provided with a first connection structure, the cover is provided with a first connection mating structure, and the first connection mating structure is detachably connected with the first connection structure.

8. The rectifier of claim 7, wherein the first connection structure is a first connection protrusion, the first connection mating structure is provided with a first fastening hole, and the first connection mating structure is adapted to be fastened to the first connection protrusion.

9. The rectifier of any one of claims 1 to 5, wherein a projection of the inlet aperture into a reference plane extends along an axial direction of the metering flow channel, the reference plane being parallel to an axis of the metering flow channel, an aspect ratio of the inlet aperture ranging from: a/b is more than or equal to 5, wherein a is the length of the air inlet hole, and b is the width of the air inlet hole.

10. An ultrasonic flow meter, comprising:

A metering body defining the metering flow channel;

the flow straightener of any one of claims 1 to 9, provided at an inlet end of the metering flow channel and connected to the metering body.