CN117367532A - Rectifying piece, rectifying device and flow detection assembly - Google Patents

Abstract

The invention belongs to the technical field of fluid flow detection, and particularly relates to a rectifying part, a rectifying device and a flow detection assembly, wherein the rectifying part comprises: the first rectifying cylinder is provided with a first end and a second end along the axial direction of the first rectifying cylinder, the first end is provided with a first opening, the second end is provided with a second opening, the size of the second opening is smaller than that of the first opening, and the first rectifying cylinder is provided with a plurality of first rectifying holes; the second rectifying cylinder is arranged in the first rectifying cylinder, the second rectifying cylinder is provided with a third end and a fourth end along the axial direction of the second rectifying cylinder, the third end faces the first end, the fourth end faces the second end downwards, the cylinder wall of the second rectifying cylinder is inclined from the fourth end to the direction close to the center line of the second rectifying cylinder, the fourth end is provided with a third opening, and the second rectifying cylinder is provided with a plurality of second rectifying holes. The rectifying piece has good rectifying effect on fluid, simple structure and low processing difficulty, and reduces the production cost.

Description

Rectifying piece, rectifying device and flow detection assembly

Technical Field

The invention belongs to the technical field of fluid flow detection, and particularly relates to a rectifying part, a rectifying device and a flow detection assembly.

Background

This section provides merely background information related to the present disclosure and is not necessarily prior art.

In order to obtain a better fluid flow field, straight pipe sections meeting the metering requirements are generally arranged at the upstream and downstream of the flowmeter, but in practical application, the installation condition of the flowmeter is severe and is easily influenced by various turbulent flow units such as upstream bent pipes, variable diameters and the like. Meanwhile, because of the limitation of the installation conditions, the upstream and downstream of the flowmeter are difficult to be provided with straight pipe sections meeting the metering requirement, and fluid flow velocity with uneven distribution is easy to be formed in the flowmeter, so that the stability of the detection data of the flowmeter is affected, the flow error is increased, and the metering precision is not met. Therefore, to improve the metering accuracy of the flowmeter, a rectifying device is usually disposed upstream of the flowmeter to rectify the turbulent and non-uniform flow velocity fluid flow field into a uniformly distributed fluid flow field, thereby facilitating the measurement and calculation of the flowmeter.

The rectifying device disclosed in the prior art is various in form and complex in structure, the front end part of the common rectifying device is composed of a spiral flow divider, but the structure has higher processing requirements, so that the structural consistency of each fan blade is required to be ensured in order to ensure that inflowing fluid is uniformly scattered and rotated, the control is difficult during processing, and the processing difficulty is increased. Meanwhile, when only a single rectifying unit is employed to face a strong turbulent flow state, it is difficult to integrate the turbulent fluid into a uniform fluid. Therefore, better rectifying effect is often realized by adding a plurality of rectifying units, but the plurality of rectifying units are complex in processing and high in processing cost, are easily limited by processing conditions and mounting conditions in actual use, and are easy to generate secondary flow field disturbance, so that the rectifying effect is reduced, and the metering of the flowmeter is inaccurate.

Disclosure of Invention

The invention aims to at least solve the problem that the structure of the existing rectifying device is complex. The aim is achieved by the following technical scheme:

a first aspect of the present invention proposes a rectifying member including a rectifying unit including:

the first rectifying cylinder is provided with a first end and a second end along the axial direction of the first rectifying cylinder, the first end is provided with a first opening, the second end is provided with a second opening, the size of the second opening is smaller than that of the first opening, and the first rectifying cylinder is provided with a plurality of first rectifying holes;

the second rectifying cylinder is arranged in the first rectifying cylinder, the second rectifying cylinder is provided with a third end and a fourth end along the axial direction of the second rectifying cylinder, the third end faces the first end, the fourth end faces the second end, the cylinder wall of the second rectifying cylinder is inclined from the fourth end to the direction close to the center line of the second rectifying cylinder, the fourth end is provided with a third opening, and a plurality of second rectifying holes are formed in the second rectifying cylinder.

According to the rectifying piece provided by the invention, the fluid is rectified for a plurality of times through the first rectifying hole of the first rectifying cylinder and the second rectifying hole of the second rectifying cylinder, so that the fluid flow fields with turbulence and uneven flow velocity are rectified into the fluid flow fields with even distribution, and the rectifying effect on the fluid is improved. In addition, the first rectifying cylinder and the second rectifying cylinder are manufactured into an integrated structure and then are installed in the rectifying device, so that the installation of the rectifying piece is simplified, and the installation space is saved. And moreover, the whole rectifying piece is simple in structure and low in processing difficulty, and the production cost is reduced.

In addition, the rectifying piece according to the invention can also have the following additional technical characteristics:

in some embodiments of the invention, the fourth end is connected to the second end.

In some embodiments of the invention, the first rectifying cylinder is disposed coaxially with the second rectifying cylinder.

In some embodiments of the invention, the first rectifying cylinder and/or the second rectifying cylinder is a conical cylinder.

In some embodiments of the invention, the taper of the first rectification barrel is less than or equal to the taper of the second rectification barrel.

In some embodiments of the invention, the third end is provided with a fourth opening having a flow area less than or equal to twice the flow area of the second orifice.

In some embodiments of the present invention, the arrangement of the first rectification holes in the first rectification barrel is the same as the arrangement of the second rectification holes in the second rectification barrel;

and/or the aperture of the first rectifying hole is the same as the aperture of the second rectifying hole.

In some embodiments of the invention, the plurality of rectifying units comprises at least a first rectifying unit and a second rectifying unit, the second end of the first rectifying unit being connected to the second end of the second rectifying unit.

In some embodiments of the invention, the rectifying member comprises a plurality of rectifying units including at least a first rectifying unit and a second rectifying unit, the second end of the first rectifying unit being connected to the second end of the second rectifying unit.

A second aspect of the present invention proposes a rectifying device comprising:

the shell, the axial both ends of said shell set up the fifth opening separately;

according to the rectifying piece provided by the first aspect of the invention, the rectifying piece is arranged in the shell, the first end of the rectifying piece faces the fifth opening, a buffer area is formed between the shell and the rectifying piece, and the buffer area is communicated with the first rectifying cylinder by the first rectifying hole.

A third aspect of the present invention provides a flow sensing assembly comprising:

a flow meter comprising a fluid inlet;

the first rectifying device is detachably arranged at the fluid inlet and comprises the rectifying piece provided by the first aspect of the invention.

In some embodiments of the invention, the flow detection assembly further comprises:

the second rectifying device is detachably arranged in the fluid inlet and is positioned at the downstream of the first rectifying device along the fluid flowing direction, the second rectifying device comprises a plurality of rectifying channels, the second rectifying device comprises a third rectifying cylinder, and the plurality of rectifying channels are arranged in the third rectifying cylinder and extend along the axial direction of the third rectifying cylinder.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

fig. 1 schematically shows a schematic view of a fairing according to an embodiment of the invention.

Fig. 2 schematically shows a cross-sectional view of a fairing according to an embodiment of the invention.

Fig. 3 schematically illustrates a perspective view of a fairing at a first opening in accordance with an embodiment of the invention.

Fig. 4 schematically shows a front view of a rectifying device according to an embodiment of the present invention.

Fig. 5 schematically shows a cross-sectional view of a rectifying device according to an embodiment of the present invention in the direction A-A of fig. 4.

Fig. 6 schematically illustrates a schematic diagram of a flow sensing assembly according to an embodiment of the present invention.

Fig. 7 schematically illustrates a front view of a flow sensing assembly according to an embodiment of the present invention.

Fig. 8 schematically illustrates a cross-sectional view of a flow sensing assembly in the direction B-B of fig. 7, in accordance with an embodiment of the present invention.

Fig. 9 schematically shows an assembly schematic of a flow meter with a second fairing according to an embodiment of the invention.

Fig. 10 schematically shows a schematic view of a second rectifying device according to an embodiment of the present invention.

Fig. 11 schematically shows a schematic cross-sectional view of a second fairing according to an embodiment of the invention.

The reference numerals are as follows:

10. a rectifying member; 1. a rectifying unit; 11. a first rectifying cylinder; 101. a first end; 102. a second end; 111. a first opening; 112. a first rectifying hole; 12. a second rectifying cylinder; 103. a third end; 1031. a fourth opening; 104. a fourth end; 121. a second rectifying hole; 13. a fixing member; 131. a fixing hole; 3. a housing; 310. a fifth opening; 105. a first rectifying unit; 106. a second rectifying unit; 31. a cache region; 100. a flow meter; 110. a fluid inlet; 200. a first rectifying device; 300. a second rectifying device; 301. a third rectifying cylinder; 302. and (3) rectifying the channel.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.

The following detailed description of the technical solutions of the present embodiment is given with reference to the accompanying drawings, and the following embodiments and examples may be combined with each other without conflict.

According to an embodiment of the present invention, as shown in fig. 1-3, a rectifying member 10 is provided, where the rectifying member 10 is used to rectify a fluid flow field with a turbulent and non-uniform flow rate into a fluid flow field with a uniform distribution, so that the flow meter 100 can accurately measure and calculate the flow rate of a fluid, which may be a gaseous fluid or a liquid fluid. The rectifying member 10 of the present embodiment includes a rectifying unit 1, the rectifying unit 1 includes a first rectifying cylinder 11 and a second rectifying cylinder 12, and referring to fig. 1 to 3, the rectifying unit 1 includes the first rectifying cylinder 11 and the second rectifying cylinder 12, and the first rectifying cylinder 11 and the second rectifying cylinder are made of a metal material, for example, stainless steel or an aluminum alloy, or the like. The first rectifying cylinder 11 has a first end 101 and a second end 102 along its axial direction, the first end 101 is provided with a first opening 111, the second end 102 is provided with a second opening (not shown in the figure), the size of the first opening 111 is larger than that of the second opening, the rectifying area of the first rectifying cylinder 11 can be increased, and the length of the first rectifying cylinder 11 can be shortened. Referring to fig. 1-3, the second rectifying cylinder 12 has a third end 103 and a fourth end 104 along its axial direction, the third end 103 faces the first end 101, the fourth end 104 faces the second end 102, the cylinder wall of the second rectifying cylinder 12 is inclined from the fourth end 104 toward a direction close to the center line of the second rectifying cylinder 12, so that the rectifying area of the second rectifying cylinder 12 can be increased, the length of the second rectifying cylinder 12 can be shortened, and at the same time, the inclined wall surface of the second rectifying cylinder 12 is convenient for guiding the fluid in the first rectifying cylinder 11 into the second rectifying cylinder 12, and the third end 103 is provided with a third opening (not shown in the drawing) so that the fluid in the second rectifying cylinder 12 flows out of the second rectifying cylinder 12.

The first rectifying cylinder 11 is provided with a plurality of first rectifying holes 112, the second rectifying cylinder 12 is provided with a plurality of second rectifying holes 121, the first rectifying holes 112 communicate the first rectifying cylinder 11 with a cavity provided by the rectifying member 10, thereby rectifying fluid flowing between the first rectifying cylinder 11 and the cavity, and the second rectifying holes 121 communicate the second rectifying cylinder 12 with the first rectifying cylinder 11, thereby rectifying fluid between the first rectifying cylinder 11 and the second rectifying cylinder 12.

The first rectifying holes 112 are, for example, circular holes, elliptical holes, square holes, or other regular or irregular holes. The plurality of first rectifying holes 112 may be the same or different in size, and may be determined according to the flow rates of the fluid flow fields entering the first rectifying cylinder 11 at different positions of the first rectifying cylinder 11. In one example (not shown in this example diagram), the first rectifying aperture 112 is large in size near the high flow rate region of the fluid flow field and the first rectifying aperture 112 is small in size near the low flow rate region of the fluid flow field, thereby rectifying the turbulent fluid flow field into a uniformly distributed fluid flow field. In an example, referring to fig. 2 to fig. 4, the sizes of the plurality of first rectifying holes 112 are the same, and since the fluid will be rectified for multiple times in the rectifying member 10, the fluid will eventually form a fluid flow field with uniform distribution after multiple times of rectification, and in addition, the processing difficulty can be reduced by setting the sizes of the plurality of first rectifying holes 112 to be the same. The arrangement of the plurality of first rectifying holes 112 on the first rectifying cylinder 11 is not limited, and in one example, referring to fig. 2 to 4, the plurality of first rectifying holes 112 are arranged in a plurality of rows, and the plurality of rows of first rectifying holes 112 are arranged at intervals of the same inclination angle on the first rectifying cylinder 11. In one example (not shown in this example drawing), the plurality of first rectifying holes 112 are connected to each other to form a honeycomb-like structure.

The second rectifying hole 121 is, for example, a circular hole, an elliptical hole, a square hole, or other regular or irregular holes. The plurality of second rectifying holes 121 may be the same or different in size, and may be determined according to the flow rates of the fluid flow field entering the second rectifying cylinder 12 at different positions of the second rectifying cylinder 12. In one example (not shown in this example diagram), the second rectifying aperture 121 near the high flow rate region of the fluid flow field is large in size and the second rectifying aperture 121 near the low flow rate region of the fluid flow field is small in size, thereby rectifying the turbulent fluid flow field into a uniformly distributed fluid flow field. In an example, referring to fig. 2 to fig. 4, the sizes of the plurality of second rectifying holes 121 are the same, and since the fluid will be rectified for multiple times in the rectifying member 10, the fluid will eventually form a fluid flow field with uniform distribution after multiple times of rectification, and in addition, the processing difficulty can be reduced by setting the sizes of the plurality of second rectifying holes 121 to be the same. The arrangement of the plurality of second rectifying holes 121 on the second rectifying cylinder 12 is not limited, and in one example, referring to fig. 2 to 4, the plurality of second rectifying holes 121 are arranged in a plurality of rows, and the plurality of rows of second rectifying holes 121 are arranged at intervals of the same inclination angle on the first rectifying cylinder 11. In an example (not shown in this example drawing), the plurality of second rectifying holes 121 are connected to each other to form a honeycomb-like structure.

In this embodiment, the fluid is rectified for multiple times through the first rectifying hole 112 of the first rectifying cylinder 11 and the second rectifying hole 121 of the second rectifying cylinder 12, so that the fluid flow field with turbulent and uneven flow velocity is rectified into the fluid flow field with even distribution, and the rectifying effect on the fluid is improved. In addition, the second rectifying cylinder 12 is arranged in the first rectifying cylinder 11 to integrate the rectifying part 10, so that the rectifying part 10 is convenient to install and use, and the installation space is saved. And, whole rectifier 10 simple structure, the processing degree of difficulty is low, has reduced manufacturing cost.

In some embodiments, the fourth end 104 is connected to the second end 102, i.e., the second opening communicates with the third opening. The fourth end 104 may be directly connected to the second end 102 or may be indirectly connected through other transition pieces. 2-4, the second opening is the same size as the third opening, and the fourth end 104 is directly connected to the second end 102 to integrally connect the first rectifying cylinder 11 and the second rectifying cylinder 12. The fourth end 104 may be connected to the second end 102 by clamping, plugging, bonding, connecting a connector, welding, or the like.

In some embodiments, the first rectifying cylinder 11 and the second rectifying cylinder 12 are coaxially arranged, that is, the axis of the first rectifying cylinder 11 coincides with the axis of the second rectifying cylinder 12, so that the rectifying effect of the rectifying part 10 is ensured, the path through which the fluid flows is reduced, and the length and the volume of the rectifying part 10 are reduced. The second rectifying cylinder 12 has an axial dimension smaller than or equal to that of the first rectifying cylinder 11, thereby preventing the second rectifying cylinder 12 from protruding out of the first rectifying cylinder 11.

In some embodiments, the first rectifying cylinder 11 and/or the second rectifying cylinder 12 are tapered cylinders, and since the tapered cylinders are axisymmetric, fluid pressures at different positions on the circumference at the same diameter are the same, the provision of the first rectifying cylinder 11 as a tapered cylinder can enhance the uniformity effect of the fluid flowing out of the first rectifying hole 112, and the provision of the second rectifying cylinder 12 as a tapered cylinder can also enhance the uniformity effect of the fluid flowing out of the second rectifying hole 121. In a preferred embodiment, the taper of the first rectifying cylinder 11 is smaller than or equal to the taper of the second rectifying cylinder 12, so that the volume of the second rectifying cylinder 12 can be reduced while securing the rectifying effect of the second rectifying cylinder 12.

In some embodiments, the third end 103 is provided with a fourth opening 1031, and fluid flowing along the axial direction of the first rectifying cylinder 11 can directly enter the second rectifying cylinder 12 through the fourth opening 1031, or fluid flowing along the axial direction of the second rectifying cylinder 12 can directly enter the first rectifying cylinder 11 through the fourth opening 1031, so as to reduce the obstruction of the fluid by the third end 103 and improve the rectifying effect. The flow area of the fourth opening 1031 is less than or equal to twice the flow area of the second rectifying bore 121, preventing the unstable fluid from excessively flowing into or out of the second rectifying cylinder 12.

In some embodiments, the arrangement of the plurality of first rectifying holes 112 in the first rectifying cylinder 11 is the same as the arrangement of the plurality of second rectifying holes 121 in the second rectifying cylinder 12. The arrangement manner defined in the present embodiment is the same, that is, the arrangement rule of the first rectifying holes 112 on the first rectifying cylinder 11 is the same as the arrangement rule of the second rectifying holes 121 on the second rectifying cylinder 12, and the arrangement rule is not specifically limited, for example, a plurality of first rectifying holes 112 are arranged in a plurality of rows on the first rectifying cylinder 11, and the plurality of rows of first rectifying holes 112 are arranged on the first rectifying cylinder 11 at intervals of a first inclination angle. The plurality of second rectifying holes 121 are arranged in a plurality of rows on the second rectifying cylinder 12, the plurality of rows of second rectifying holes 121 are arranged on the second rectifying cylinder 12 at intervals of a second inclination angle, and the first inclination angle is the same as the second inclination angle. In other possible manners, the first rectifying holes 112 are arranged at intervals along the circumferential and axial directions of the first rectifying cylinder 11, and the second rectifying holes 121 are arranged at intervals along the circumferential and axial directions of the second rectifying cylinder 12. Arranging the plurality of first rectifying holes 112 and the plurality of second rectifying holes 121 in the same manner can reduce the processing difficulty and the production cost while maintaining the rectifying effect of the rectifying member 10.

In some embodiments, the aperture of the first rectifying hole 112 is the same as the aperture of the second rectifying hole 121, so that the processing difficulty can be reduced and the production cost can be reduced while ensuring the rectifying effect.

In the actual production process, regular through holes can be distributed on the surfaces of the regular stainless steel plates, then the stainless steel plates are cut according to the structural sizes of the first rectifying cylinder 11 and the second rectifying cylinder 12 and rolled into corresponding conical structural forms, and the connection relations of the partial structures in the rectifying piece 10 are correspondingly connected. Of course, the holes may be machined by first forming a plurality of stainless steel plates into a corresponding tapered structure according to the structural dimensions of the first rectifying cylinder 11 and the second rectifying cylinder 12.

In some embodiments, the rectifying member 10 includes a plurality of rectifying units 1, the plurality of rectifying units 1 are sequentially connected, and in two adjacent rectifying units 1, a first end 101 of one rectifying unit 1 is connected to a first end 101 of another rectifying unit 1, or a second end 102 of one rectifying unit 1 is connected to a second end 102 of another rectifying unit 1, and any two adjacent rectifying units 1 are arranged in a mirror symmetry manner, and a turbulent fluid field entering the rectifying member 10 is integrated into a uniform fluid field after multiple rectifying of the plurality of rectifying units 1.

In some embodiments, the plurality of rectifying units 1 at least includes a first rectifying unit 105 and a second rectifying unit 106, where the second end 102 of the first rectifying unit 105 is connected to the second end 102 of the second rectifying unit 106, and the first rectifying unit 105 is in communication with the second rectifying unit 106, that is, the first rectifying cylinder 11 and the second rectifying cylinder 12 of the rectifying unit 1 are in communication with the first rectifying cylinder 11 and the second rectifying cylinder 12 of the second rectifying unit 106. When the turbulent fluid enters the rectifying member 10, the fluid circulates between the first rectifying cylinder 11 and the second rectifying cylinder 12 of the first rectifying unit 105, and between the cavities provided by the rectifying member 10, and between the first rectifying cylinder 11 and the second rectifying cylinder 12 of the second rectifying unit 106, and finally flows out from the first opening 111 of the second rectifying cylinder 12. After the fluid is rectified by the first rectifying unit 105 and the second rectifying unit 106, the vortex of the uneven airflow formed in the fluid flow field can be eliminated, and then the rectifying effect of the fluid is further improved under the secondary rectifying action of the second rectifying unit 106. Through linking to each other second end 102 with first end 101, can shorten the flow path of fluid between first rectification section of thick bamboo 11 and second rectification section of thick bamboo 12, promote rectification efficiency to still realized the integration of rectifier 10, the pressure loss is big can not appear, the unstable condition in fluid flow field, and be convenient for the installation and the use of rectifier 10, saved installation space.

The whole structure of the rectifying part 10 of the embodiment is simple, the processing difficulty is low, and the production cost is reduced. The rectifying material 10 of the present embodiment is applicable to rectifiers of various diameters, and the first rectifying tube 11 and the second rectifying tube 12 need only be reworked according to the diameter without separately designing the small-diameter and large-diameter flow meters 100.

According to an embodiment of the present invention, as shown in fig. 4 to 5, the present embodiment proposes a rectifying device, which includes a housing 3 and a rectifying member 10 as set forth in the above embodiment, wherein an inner chamber of the housing 3 is, for example, a cylindrical chamber, fifth openings 310 are respectively provided at both axial ends of the housing 3, and a fluid flows into the inner chamber through the fifth openings 310 at one end of the housing 3 and then flows out of the inner chamber through the fifth openings 310 at the other end of the housing 3. The rectifying piece 10 is arranged in the shell 3, the first end 101 of the rectifying piece 10 faces the fifth opening 310 and is positioned at the center of the shell 3, so that the rectifying effect is ensured, and meanwhile, the volume of the rectifying piece 10 is effectively reduced. A buffer area 31 is further formed between the housing 3 and the rectifying member 10, and the buffer area 31 is communicated with the first rectifying cylinder 11 by the first rectifying hole 112 of the rectifying member 10, so that fluid circulates between the first rectifying cylinder 11 and the buffer area 31, and the rectifying effect is improved.

In an example, the rectifying member 10 includes a first rectifying unit 105 and a second rectifying unit 106, the first end 101 of the first rectifying unit 105 faces one of the fifth openings 310, the first end 101 of the second rectifying unit 106 faces the other of the fifth openings 310, and the second end 102 of the first rectifying unit 105 is connected to the second end 102 of the second rectifying unit 106. In an example, the first end 101 is sized to the fifth opening 310, i.e. the wall of the first end 101 is in contact with the inner wall of the housing 3, so that the fluid entering the housing 3 must be rectified by the rectifying member 10 before it can flow out of the housing 3. Of course, the size of the first opening 111 may be smaller than the size of the fifth opening 310, and the first end 101 is only required to be provided with a fixing baffle, the fixing baffle is provided with a through hole communicated with the first opening 111, the rectifying piece 10 is fixed in the housing 3 through the fixing baffle, and the size of the fixing baffle is larger than or equal to the size of the fifth opening 310.

In the manufacture of the fairing 10 device, the fairing 10 may be manufactured as a unitary structure and then mounted within the housing 3. The first end 101 of the rectifying unit 1 is further provided with a fixing piece 13, a fixing hole 131 is formed in the fixing piece 13, a screw hole is formed in a position, corresponding to the fixing hole 131, of the shell 3, after the rectifying unit 1 is inserted into the shell 3 through the fifth opening 310, the rectifying unit 1 passes through the fixing hole 131 through a screw connecting piece to be matched with the screw hole, and therefore the rectifying piece 10 is fixed in the shell 3. The fixing element 13 is, for example, a flange element.

According to an embodiment of the present invention, as shown in fig. 6 to 11, the present embodiment proposes a flow rate detection assembly including a flow meter 100 and a first rectifying device 200. The flow meter 100 is used for detecting a flow rate of a fluid, and the flow meter 100 is, for example, an ultrasonic flow meter 100. Referring to fig. 8-9, the flow meter 100 includes a fluid inlet 110 through which fluid enters the flow meter 100, and the flow meter 100 senses the flow of the fluid. Since the metering accuracy of the flowmeter 100 is related to the distribution situation of the flow field, in order to obtain a better flow value of the fluid flow field, in this embodiment, the first rectifying device 200 is disposed at the upstream of the flowmeter 100, the first rectifying device 200 is the rectifying member 10 in the foregoing embodiment, the first rectifying device 200 is detachably disposed at the fluid inlet 110, and after the first rectifying device 200 rectifies the turbulent fluid into the fluid flow field with uniform distribution, the flowmeter 100 detects the fluid flow field with uniform distribution, so that the accuracy of the detection result of the flowmeter 100 can be improved.

In some embodiments, referring to fig. 8, 10, and 11, the flow detection assembly further includes a second flow straightener 300, the second flow straightener 300 being removably disposed within the fluid inlet 110 and downstream of the first flow straightener 200, the second flow straightener 300 including a plurality of flow straightener channels 302. In an example, referring to fig. 10, the second rectifying device 300 includes a third rectifying cylinder 301, and a plurality of rectifying channels 302 are disposed in the third rectifying cylinder 301 and extend in an axial direction of the third rectifying cylinder 301. The cross-section of the rectifying passageway 302 may be circular, oval, square, or other regular or irregular shape, and as an example, referring to fig. 11, the second rectifying means 300 is in a honeycomb structure. The rectifying channel 302 can straighten the airflow which is rectified by the first rectifying device 200 and is uniformly distributed, so that an airflow with uniform and stable flow speed is formed in the flowmeter 100, and the flowmeter 100 has high measuring precision, small error and strong anti-interference capability.

The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims (11)

1. A fairing, the fairing comprising a fairing unit, the fairing unit comprising:

the first rectifying cylinder is provided with a first end and a second end along the axial direction of the first rectifying cylinder, the first end is provided with a first opening, the second end is provided with a second opening, the size of the second opening is smaller than that of the first opening, and the first rectifying cylinder is provided with a plurality of first rectifying holes;

the second rectifying cylinder is arranged in the first rectifying cylinder, the second rectifying cylinder is provided with a third end and a fourth end along the axial direction of the second rectifying cylinder, the third end faces the first end, the fourth end faces the second end, the cylinder wall of the second rectifying cylinder is inclined from the fourth end to the direction close to the center line of the second rectifying cylinder, the fourth end is provided with a third opening, and a plurality of second rectifying holes are formed in the second rectifying cylinder.

2. The fairing as recited in claim 1, wherein said fourth end is connected to said second end.

3. The fairing of claim 2, wherein the first fairing cylinder is coaxially disposed with the second fairing cylinder and the second fairing cylinder has an axial dimension that is less than or equal to the axial dimension of the first fairing cylinder.

4. A fairing according to claim 3, wherein the first fairing cylinder and/or the second fairing cylinder is a conical cylinder.

5. The fairing of claim 4, wherein the taper of the first fairing cylinder is less than or equal to the taper of the second fairing cylinder.

6. The fairing of claim 1 wherein the third end is provided with a fourth opening having a flow area less than or equal to twice the flow area of the second fairing orifice.

7. The rectifying member according to claim 1, wherein an arrangement of said plurality of first rectifying holes in said first rectifying cylinder is identical to an arrangement of said plurality of second rectifying holes in said second rectifying cylinder;

and/or the aperture of the first rectifying hole is the same as the aperture of the second rectifying hole.

8. The fairing of any one of claims 1-7, wherein the fairing comprises a plurality of fairing units including at least a first fairing unit and a second fairing unit, the second end of the first fairing unit coupled to the second end of the second fairing unit.

9. A rectifying device, the rectifying device comprising:

the shell, the axial both ends of said shell set up the fifth opening separately;

the fairing of any one of claims 1-8, the fairing disposed within the housing, a first end of the fairing facing the fifth opening, a buffer area formed between the housing and the fairing, the first fairing aperture communicating the buffer area with the first fairing.

10. A flow sensing assembly, the flow sensing assembly comprising:

a flow meter comprising a fluid inlet;

a first fairing removably disposed in the fluid inlet, the first fairing comprising the fairing of claim 9.

11. The flow sensing assembly of claim 10, further comprising:

the second rectifying device is detachably arranged in the fluid inlet and is positioned at the downstream of the first rectifying device along the fluid flowing direction, the second rectifying device comprises a plurality of rectifying channels, the second rectifying device comprises a third rectifying cylinder, and the plurality of rectifying channels are arranged in the third rectifying cylinder and extend along the axial direction of the third rectifying cylinder.