CN110987094B

CN110987094B - Rigidity variable cross-section device

Info

Publication number: CN110987094B
Application number: CN201911412138.1A
Authority: CN
Inventors: 吴宇清; 姜春林
Original assignee: Individual
Current assignee: Individual
Filing date: 2019-12-31
Publication date: 2024-06-25
Anticipated expiration: 2039-12-31

Abstract

The invention discloses a rigid variable cross-section device, comprising: the detection pipeline is used for allowing fluid to be detected to pass through and is made of rigid materials; a driving part for providing driving force for the executing part; the execution part is in transmission connection with the power output end of the driving part and is arranged on the inner wall of the detection pipeline, and the execution part comprises at least one deformation unit which can act under the action of driving force to change the gap between the execution part and the installation wall surface, and the cross section area inside the detection pipeline is changed through the deformation unit. The problems of complex detection pipeline, high cost, large installation space and the like in the prior art are solved, the cross section of the detection pipeline is changed on line to widen the range ratio, the cost is greatly reduced, the installation space is reduced, the realizability of the variable cross section of the rigid detection pipeline is provided, the action is flexible and reliable, the sensitivity is high, and the operation is easy.

Description

Rigidity variable cross-section device

Technical Field

The invention relates to the field of flow measurement, in particular to a rigid variable cross-section device which is applied to the flow measurement process to change the cross-sectional area of a fluid pipeline. The device can also be used in the fields of venturi mixing or dust removal and the like, flow regulating valves and the like.

Background

For flow measurement of liquid and gas, a sensor is arranged on a pipeline through which the fluid flows, an electric signal is measured through the sensor, the pressure difference of the fluid in the pipeline can be reflected through the electric signal, the flow velocity of the fluid can be calculated through the pressure difference, and the flow can be obtained according to the density rho, the flow velocity v and the relation between the cross section A and the flow Q of the fluid, namely Q=rho multiplied by v multiplied by A; due to the limitation of the measuring range of the sensor, the perceived pressure difference deltap is between deltap _min～Δp_max, and the measuring range ratio of the flow is the same with the measuring pipelineEqual to/>

In an actual use scene, the range ratio of some flowing processes is large, a single conventional flowmeter cannot meet the requirement of full-range measurement, a plurality of flow measuring devices are usually connected in parallel, the full-range measurement is carried out to measure the flow in different processes in a valve switching or combining mode, different valve combinations are required to be switched according to different flowing states in the mode, on one hand, the measuring process is complicated, the control program is complex, and more executive elements are required to be matched to finish the switching of the measuring devices; on the other hand, the measurement cost is improved by a plurality of times; finally, a plurality of measuring devices need larger installation space, so that higher requirements are put forward on the applicable environment, and the installation, maintenance and overhaul costs are greatly increased correspondingly.

Disclosure of Invention

The invention provides a fluid flow measurement system, which is used for overcoming the defects of complex measurement pipeline, high cost, complex control flow, large installation space and the like in the prior art, greatly reduces the number of measurement devices, simplifies the measurement control program, reduces the installation space, reduces the installation, maintenance and overhaul cost, provides the realizability of the variable section of a rigid detection pipeline, and has flexible and reliable action, high sensitivity and easy operation by changing the cross section of the fluid pipeline in the measurement process so as to improve the range ratio of flow measurement.

To achieve the above object, the present invention provides a rigid variable cross-section device comprising:

the detection pipeline is used for allowing fluid to be detected to pass through and is made of rigid materials;

a driving part for providing driving force for the executing part;

The execution part is in transmission connection with the power output end of the driving part and is arranged on the inner wall of the detection pipeline, and the execution part comprises at least one deformation unit which can act under the action of driving force to change the gap between the execution part and the installation wall surface, and the cross section area inside the detection pipeline is changed through the deformation unit.

When the rigid variable cross-section device provided by the invention is used, firstly, the detection pipeline is arranged in the pipeline through which fluid to be detected flows, and in the measurement process, the deformation unit of the execution part acts and changes the gap between the inner wall of the detection pipeline and the inner wall of the detection pipeline opposite to the deformation unit according to the pressure difference in the fluid flowing through the detection pipeline by the driving force provided by the driving part, so that the cross-sectional area in the detection pipeline is changed; the cross-sectional area of the detection pipeline is dynamically changed on line, the flow state of fluid in the detection pipeline is changed, so that the detection signal of the differential pressure sensor is in a normal detection range, the range ratio of the flow of the measurement system is expanded, the measurement requirement of the flow measurement system in a complex flow state is met, the number of the detection pipeline and the sensor and the scale of the measurement control system are reduced, the installation space is greatly reduced, and the installation, maintenance and overhaul cost is reduced; and the deformation unit is realized through a mechanical structure, so that the reliability and the sensitivity are high, and the operation is easy.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram showing a reference state of a rigid variable cross-section device according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram showing a second reference state of a rigid variable cross-section device according to the first embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a rigid variable cross-section device according to a first embodiment of the present invention;

FIG. 4 is a schematic axial cross-sectional view of a rigid variable cross-section device according to a second embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of a rigid variable cross-section device according to a second embodiment of the present invention;

fig. 6 is a schematic view showing a state in which a single-side deforming unit of a rigid variable cross-section device according to a third embodiment of the present invention is deformed in a minimum cross-section;

Fig. 7 is a schematic view showing a state in which a single-side deforming unit of a rigid variable cross-section device according to a third embodiment of the present invention is deformed in a maximum cross-section;

fig. 8 is a schematic structural view of a double-sided deforming unit of a rigid variable cross-section device according to a third embodiment of the present invention;

FIG. 9 is a schematic view of the back structure of FIG. 8;

fig. 10 is a schematic diagram of a four-axis driving of a rigid variable cross-section device according to a third embodiment of the present invention.

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; the device can be mechanically connected, electrically connected, physically connected or wirelessly connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.

Example 1

As shown in fig. 1, an embodiment of the present invention provides a rigid variable cross-section device, which includes a detection pipe 1, a driving component and an executing component, wherein the detection pipe 1 is used for passing a fluid to be tested and is made of a rigid material; the driving component is used for providing driving force for the executing component; the actuating component is in transmission connection with the power output end of the driving component and is arranged on the inner wall of the detection pipeline 1, and the actuating component comprises at least one deformation unit which can act under the action of driving force to change the gap between the actuating component and the installation wall surface, and the cross section area inside the detection pipeline 1 is changed through the deformation unit.

The detection pipeline 1 can be made of rigid materials (such as steel pipes), and the cross section of the pipeline can be in a general round shape or a square shape;

The deformation unit refers to a component or assembly capable of deforming under the action of driving force, and the deformation can be generated by the mechanical structure of the component or the material under the action of external force.

When the detection pipeline 1 is made of rigid materials, the executing component can be arranged on the inner wall of the detection pipeline 1, the executing component can be formed by sequentially hinging three panels, wherein the end parts of the two panels positioned at the two ends are respectively hinged on the wall of the detection pipeline 1, and the driving component drives the hinged shaft to rotate so that the executing component acts inside the detection pipeline 1, so that the middle panel moves to a position close to the central axis of the detection pipeline 1 in the radial direction while moving along the axial direction of the detection pipeline 1, and the gap between the middle panel and the detection pipeline 1 is reduced in the process, so that the cross section is reduced.

Preferably, the deformation unit includes a first inner runner side plate 31, an inner runner side plate 33, and a second inner runner side plate 32, and the inner runner side plate 33 is arranged along the axial direction or the length direction of the detection pipe 1 in the length direction; one ends of the first inner runner side plate 31 and the second inner runner side plate 32 are hinged on the detection pipeline 1 through a first hinge shaft 31a and a second hinge shaft 32a respectively; the other ends of the first inner runner side plate 31 and the second inner runner side plate 32 are hinged with the two ends of the inner runner type panel 33 through a third hinge shaft 31b and a fourth hinge shaft 32b respectively, and the inner runner type panel 33 swings around the first hinge shaft 31a of the first inner runner side plate 31 and the second hinge shaft 32a of the second inner runner side plate 32 under the action of a driving part to change the cross section area of the detection pipeline 1; the driving part is arranged outside the detection pipeline 1 and is used for driving the hinge shaft of at least one inner runner side plate to rotate; that is, the driving member may drive the first hinge shaft 31a or the second hinge shaft 32a alone or may drive both shafts simultaneously, but it is necessary to keep the synchronous operation.

The shape of the inner flow channel type panel 33 is adapted to the shape of the pipe wall of the detection pipe 1 covered by the inner flow channel type panel 33, for example, when the detection pipe is a square pipe, the inner flow channel type panel 33 is a plane; when the detection pipe is a circular pipe, the inner runner type panel 33 is a cambered surface.

Preferably, the detection pipe 1 is a square pipe, the inner runner side plates are respectively mounted on two opposite faces of the detection pipe through hinge shafts, and the inner runner panel 33 is a plane and parallel to a side face between the two faces.

Referring to fig. 1 and 2, the detection pipe 1 is made of a rigid material; and the cross section of the detection pipeline 1 is square; the first hinge shafts 31a are hinged on two parallel first side surfaces 11 of the detection pipeline 1, and the inner runner panel 33 swings around the first hinge shaft 31a of the first inner runner side plate 31 and the second hinge shaft 32a of the second inner runner side plate 32 under the action of the driving component to change the size of the cross section area of the detection pipeline 1; the inner runner panel 33 is planar and parallel to the second side 12 between the two parallel first sides 11. The driving component is installed outside the detection pipeline 1 and is used for driving the first hinge shaft 31a connected with the detection pipeline 1 by the first inner flow path side plate 31 and/or driving the second hinge shaft 32a connected with the detection pipeline 1 by the second inner flow path side plate 32 to rotate.

When the driving component drives the first hinge shaft 31a connected with the first inner runner side plate 31 and the detection pipeline 1 and/or drives the second hinge shaft 32a connected with the second inner runner side plate 32 and the detection pipeline 1 to rotate, the first inner runner side plate 31 and the second inner runner side plate 32 drive the inner runner type panel 33 to swing around the first hinge shaft 31a and the second hinge shaft 32a, and the inner runner type panel 33 moves between the two second side surfaces 12, wherein the distance between the second side surface 12 deviating from the executing component 32 and the inner runner type panel 33 is adjusted, and the cross section area inside the detection pipeline 1 is changed. The state of fig. 1 shows a state in which the first inner flow path side plate 31 and the second side surface 12 form an angle of 90 degrees, and the cross-sectional area of the interior of the detection pipe 1 is the smallest; when the included angle between the first inner flow path side plate 31 and the second side surface 12 is 0 degree or 180 degrees, the cross-sectional area of the inside of the detection pipe 1 is maximum; the state of fig. 2 shows a state in which the first inner flow path side plate 31 is at an angle of 30 degrees to the second side surface, and the cross-sectional area is located therebetween.

Preferably, with continued reference to fig. 1 and 2, at least one of the two surfaces (the second side surface 12) of the detection pipe 1 on which the hinge shaft of the side plate of the inner flow path is mounted is provided with a semicircular limit groove 13, and the end portion of the first hinge shaft 31a and/or the second hinge shaft 32a is located in the respective limit groove 13 and slides in the limit groove 13 with the action of the driving component. The cooperation of the limiting groove 13 and the hinge shaft can limit the actions of the inner runner panel 33, the first inner runner side plate 31 and the second inner runner side plate 32, so that the stability of the deformation unit is improved, and the output variable cross-sectional area is more matched with the actual cross-sectional area.

Referring to fig. 3, the first hinge shaft 31a passes through two first sides 11 of the square tube and is mounted on the first sides 11 through bearings, the first hinge shaft 31a is in transmission connection with the first inner runner side plate 31, an output end of the driving part 2 (not shown) is in transmission connection with the first hinge shaft 31a, the first hinge shaft 31a is driven to rotate, the first inner runner side plate 31 is driven to rotate, and the inner runner panel 33 is driven to move through the third hinge shaft 31 b.

Example two

As a modification of the first embodiment described above, referring to fig. 4, the deforming unit includes an interference layer 37 and a deforming film layer 38; the interference layer 37 is arranged on the inner wall of the detection pipeline 1; the deformation film layer 38 connects the edge of the interference layer 37 with the inner wall of the detection pipeline 1, and deforms along with the radial approach or separation of the interference layer 37 from the inner wall of the detection pipeline 1 under the action of driving force; the interference layer 37, the deformation film layer 38 and the inner wall of the detection pipeline 1 covered by the interference layer 37 are enclosed together to form a sealing cavity 30; the detection pipeline 1 is provided with a through hole 301 communicated with the sealing cavity 30, and the through hole 301 is connected with the driving part 2 through a connecting pipe; the driving part 2 comprises a gas source or a liquid source and a conveying device for inputting or discharging gas or liquid into or from the sealing cavity according to the instruction of the control device. The interference layer 38 is coincident with the inner wall of the detection conduit 1.

The deformable membrane 38 is made of a flexible material or is formed of a folded rigid membrane.

In an embodiment of the present invention, the detecting pipe 1 is a circular pipe, and the rigid variable cross-section device further includes a deformation unit; the two deformation units are respectively arranged on the inner wall of the detection pipeline 1 and are opposite to each other in the circumferential direction; the interference layers 37 of the two deformation units are arc-shaped.

Preferably, to improve the effectiveness of the deformation unit against the change of the cross-sectional area, the interference layer 38 is made of a rigid material, has elasticity in the direction of the arc, and can adapt to the inner wall of the detection pipe covered by each interference layer when the radius of curvature is increased under the action of the driving force.

Preferably, the central angle corresponding to the natural state of the interference layer 37 is 180 degrees.

Referring to fig. 4, the executing component 3 includes an interference layer 37 disposed on an inner wall of the detection pipeline 1, the interference layer 37 has a two-half structure, an edge of the interference layer 37 is connected with the inner wall of the detection pipeline 1 through a deformation film layer 38, and the interference layer 37, the deformation film layer 38 and the inner wall of the detection pipeline 1 covered by the interference layer 37 enclose a sealing cavity 30 together; the detection pipeline 1 is provided with a through hole 301 communicated with the sealing cavity 30, and the through hole 301 is connected with a driving part 31 through a connecting pipe; the driving part 31 includes a gas source or a liquid source and a delivery device for inputting or discharging gas or liquid to or from the seal chamber according to an instruction of the control device.

When the cross-sectional area needs to be reduced, gas is introduced into the sealing cavity 30 through the connecting pipe and the through hole 301 by the driving part 31, and the driving interference layer 37 moves in the radial direction towards the central axis direction of the detection pipeline 1, so that the cross-sectional area inside the detection pipeline 1 is reduced; the driving part 31 pumps air from the sealing cavity 30 to the outside through the connecting pipe and the through hole 301, and the driving interference layer 37 moves towards the pipe wall direction of the detection pipe 1 in the radial direction, so that the cross section area of the inside of the detection pipe 1 is increased.

When the cross section of the detection pipeline 1 is circular, the interference layer 37 can be in a tile-shaped structure, the radian can generate elastic deformation, the state of the minimum cross section is shown in fig. 5, the interference layer 37 is not elastically deformed, and the interference layer 37 is just combined to form a circular shape; when the inside of the sealing cavity 30 is in a vacuum state, the interference layer 37 is outwards unfolded under the action of the elastic layer 38, the central angle corresponding to the radian is reduced, the interference layer is completely attached to the inner wall of the detection pipeline 1, and the cross section area is approximately equal to the non-interference state of the detection pipeline 1.

When the cross section of the detection conduit 1 is square, the interference layer 37 may be made of a rigid material and disposed on the inner side wall or the opposite inner side walls of the detection conduit 1.

Example III

As another variation of the first embodiment, referring to fig. 6-9, the deforming unit further includes: two rectifying plates and two guide grooves; each rectifying plate is respectively positioned at the outer side of one inner runner side plate, one end of each rectifying plate is hinged with both ends of the inner runner type panel (hinged through an inner runner hinge shaft), and the other ends of the two rectifying plates are respectively provided with a guide shaft; the two guide grooves are arranged on the cover plate of the detection pipeline and are close to the adjacent side plates and are respectively positioned at the outer sides of the whole formed by connecting the two inner runner side plates and the inner runner panel; one end of each guide shaft is positioned in one guide groove and moves in the guide groove along with the action of the inner runner type panel; the driving part comprises a motor, and an output shaft of the motor drives one of the inner runner side plates in the deformation unit to rotate through a worm gear transmission mechanism; the worm of the worm gear and worm transmission mechanism is arranged on the back surface of the detection pipeline cover plate, and worm gear transmission meshed with the worm is arranged on a variable cross section driving shaft hinged with an inner runner side plate and the detection pipeline.

In this embodiment, the detection pipe is a square pipe, the guide groove is arranged along the axial direction of the square pipe and is horizontal, wherein fig. 6 and 7 are illustrations of arranging deformation units on one side inside the detection pipe 1, and fig. 8 and 9 are illustrations of arranging deformation units on two sides inside the detection pipe 1; the action principle is as follows: when the variable cross-section device is required to be started to act, the motor output shaft is connected with one end of the worm in a transmission way, the worm drives the two worm gears to rotate respectively, the worm gears are connected with one end of the variable cross-section driving shaft extending out of the cover plate in a transmission way, so that the variable cross-section driving shaft drives the inner runner side plate connected with the variable cross-section driving shaft to rotate (at the moment, the two rectifying plates act along with the variable cross-section driving shaft through the matching of the guide shaft and the guide groove), and further the inner runner profile is driven to act so as to reduce the throat section area of the square pipeline.

As a further improvement of the technical scheme of arranging deformation units on two sides, referring to fig. 10, when the fluid viscosity in the pipeline is detected to be in a large or large pressure flowing state, and four-axis driving is needed, an output shaft of a motor is in transmission connection with one end of a worm, a worm wheel is meshed with the worm, a main gear is coaxially arranged with the worm wheel, and four slave gears (marked as gears in fig. 10) which are respectively and externally meshed with the main gear are respectively arranged at one ends of two variable-section driving shafts (shafts of which two inner runner side plates in each deformation unit are hinged with the detection pipeline) of two deformation units respectively; four variable cross-section driving shafts are simultaneously driven to rotate through a motor, a worm gear mechanism and a gear mechanism, and the inside of each deformation unit is driven by double shafts so as to improve driving force.

Preferably, in order to improve the flow detection precision, the rectifying plates are designed to be outwards protruded arc-shaped, and/or the two ends of the inner runner type panel, which are close to the rectifying plates, are curved, and form a streamline transition curved surface together with the rectifying plates. According to the structure of the first embodiment, the sharp included angle molded surface easy to form between the inner runner side plate and the side plate is easy to form vortex when fluid flows through, measurement error is increased when flow measurement is conducted, and the structure enables the rectifying plate and the inner runner panel to form a transition curved surface, so that the formation of the vortex is relieved, and measurement accuracy is improved.

The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.

Claims

1. A rigid variable cross-section device, comprising:

a driving part for providing driving force for the executing part;

The execution part is in transmission connection with the power output end of the driving part and is arranged on the inner wall of the detection pipeline, and comprises at least one deformation unit which can act under the action of driving force to change the gap between the execution part and the installation wall surface, and the cross section area inside the detection pipeline is changed through the deformation unit;

The deforming unit includes:

an inner runner type panel, the length direction of which is arranged along the axial direction of the detection pipeline;

Two inner runner side plates, one end of which is respectively hinged with two ends of the inner runner type panel, and the other end of which is hinged on the detection pipeline;

The inner runner type panel swings around the hinge shafts of the two inner runner side plates under the action of the driving part so as to change the cross section of the detection pipeline;

the driving part is arranged outside the detection pipeline and is used for driving the hinge shaft of at least one inner runner side plate to rotate.

2. The rigid variable cross-section device of claim 1, wherein the detection duct is a square duct, the inner runner side plates are respectively mounted on two opposite faces of the detection duct through hinge shafts, and the inner runner panel is a plane and parallel to a side face between the two faces.

3. The rigid variable cross-section device according to claim 2, wherein the detection pipeline is installed on two surfaces of the hinge shaft of the side plate of the inner flow path, at least one inner wall of the surface is provided with a semicircular limit groove, and the end part of the hinge shaft connected with the side plate of the inner flow path and the side plate of the inner flow path is positioned in the limit groove and slides in the limit groove along with the action of the driving part.

4. The rigid variable cross-section device of claim 1, wherein the deforming unit further comprises:

Two rectifying plates, each of which is positioned at the outer side of an inner runner side plate, one end of each of which is hinged with two ends of the inner runner type panel, and the other ends of which are respectively provided with a guide shaft;

The two guide grooves are arranged on the cover plate of the detection pipeline and are close to the adjacent side plates and are respectively positioned at the outer sides of the whole formed by connecting the two inner runner side plates and the inner runner panel;

one end of each guide shaft is positioned in one guide groove and moves in the guide groove along with the action of the inner runner type panel;

the driving part comprises a motor, and an output shaft of the motor drives one of the inner runner side plates in the deformation unit to rotate through a worm gear transmission mechanism;

the worm of the worm gear and worm transmission mechanism is arranged on the back surface of the detection pipeline cover plate, and worm gear transmission meshed with the worm is arranged on a variable cross section driving shaft hinged with an inner runner side plate and the detection pipeline.

5. The rigid variable cross-section device of claim 4, wherein the rectifying plates are all arc-shaped and outwards protruded, and/or the inner runner type panels are curved near two ends of the rectifying plates, and form streamline transition curved surfaces together with the rectifying plates.