CN110672167A - Method for widening flow measurement range of throttling device - Google Patents
Method for widening flow measurement range of throttling device Download PDFInfo
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- CN110672167A CN110672167A CN201911053377.2A CN201911053377A CN110672167A CN 110672167 A CN110672167 A CN 110672167A CN 201911053377 A CN201911053377 A CN 201911053377A CN 110672167 A CN110672167 A CN 110672167A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
- G01F1/42—Orifices or nozzles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
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Abstract
The invention discloses a method for widening the flow measurement range of a throttling device, wherein the throttling device comprises a pipeline, a throttling piece is arranged in the pipeline, and the throttling piece is connected with a position adjusting mechanism for changing the position of the throttling piece; the position of the throttling element in the pipeline is changed through the position adjusting mechanism, and the flow area between the throttling element and the pipeline is changed, so that the flow measurement range of the throttling device is expanded; the method for widening the flow measurement range of the throttling device changes the flow area between the throttling element and the pipeline by changing the position of the throttling element in the pipeline on the basis of the traditional throttling device, thereby achieving the purpose of expanding the flow measurement range of the throttling device; the throttling device for expanding the flow measurement range by using the method has the advantages of simple structure and lower cost, and can better meet the wide range requirement of medium measurement.
Description
Technical Field
The present invention relates to a method for widening a measurement range, and more particularly, to a method for widening a flow measurement range of a throttling device.
Background
In the fields of daily life, industrial and agricultural production and the like, the necessary materials and energy sources such as common air, water, steam, gas, natural gas, ethylene and the like exist, when the materials (media) are utilized, most of people need to measure the materials and the energy sources to know the quantity of the materials and the energy sources, and an instrument for measuring the materials and the energy sources is a measuring instrument. The prior art metering devices are various, and their advantages are all emphasized, and the throttling device is one of the metering devices. When the continuous fluid medium flows through a preset throttling device in the pipeline in the moving process of the continuous fluid medium in the pipeline, the flow beam of the continuous fluid medium forms a local reducing state at the throttling device. Thereby increasing the flow rate of the fluid medium and relatively decreasing the hydrostatic pressure. This condition creates a pressure drop (differential pressure) upstream and downstream of the restriction; the relatively greater the flow rate of the flowing medium, the greater the pressure difference which is generated upstream and downstream of the throttle device. Therefore, the pressure difference of the throttling device can be converted to relatively measure the flow of the fluid in the throttling device, which is the basic principle of utilizing the throttling device to specifically measure the flow of the continuous flowing medium in the pipeline.
In the throttling device, the throttling device is divided into a plurality of types according to the structural form, such as an orifice plate, a nozzle, a venturi tube, a conical throttling device, a wedge-shaped throttling device, a pipe measuring throttling device and the like, and the measuring device generally has a small measuring range (measuring range) and is difficult to meet the wide range requirement of medium measurement. The throttling device taking the orifice plate and the nozzle as throttling pieces is one of the most widely applied flow measuring devices in the industrial production and trade settlement at present, and has the defects that the flow measuring range is small, and the ratio of the maximum flow to the minimum flow (namely the range degree) is 3-5: 1. In practical application, when the medium flow in a detected pipeline changes greatly, the range of the medium flow is often far larger than 3-5: 1, for example, when the medium flow in the pipeline is large in winter and small in summer, a throttling device designed according to large flow in winter can hardly measure the flow of the medium in the pipeline when the medium flow in the pipeline is small in summer. Therefore, a method for widening the flow measurement range of the throttling device is needed.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a method for widening the flow measurement range of a throttling device.
In order to solve the technical problems, the invention adopts the technical scheme that: a method for widening the flow measurement range of a throttling device comprises a pipeline, wherein a throttling piece is arranged in the pipeline, and the throttling piece is connected with a position adjusting mechanism for changing the position of the throttling piece; the position of the throttling element in the pipeline is changed through the position adjusting mechanism, and the flow area between the throttling element and the pipeline is changed, so that the flow measurement range of the throttling device is expanded.
Preferably, the pipeline comprises a first small-diameter pipe, a first large-diameter pipe and a first outlet pipe, and the first small-diameter pipe, the first large-diameter pipe and the first outlet pipe are communicated in sequence from front to back; the throttling element comprises an annular plate, and the position adjusting mechanism comprises a moving mechanism; the annular plate is provided with two positions in the pipeline, namely a position A in the first small-diameter pipe and a position B in the first large-diameter pipe; the moving mechanism drives the annular plate to move back and forth to realize the switching of the annular plate between the position A and the position B, thereby expanding the flow measurement range of the throttling device;
when the annular plate is positioned at the position A in the first small-diameter pipe, a first small annular gap with a small flow-through area is formed between the annular plate and the first small-diameter pipe, and the throttling device can measure the small flow of a medium in the pipeline; when the annular plate is positioned at the position B in the first large-diameter pipe, a first large clearance with large flow area is formed between the annular plate and the first large-diameter pipe, and the throttling device can measure the large flow of the medium in the pipeline;
a high-pressure taking hole is formed in the first small-diameter pipe, a low-pressure taking hole is formed in the first outlet pipe, and the first high-pressure taking hole and the first low-pressure taking hole are used for obtaining a differential pressure value.
Preferably, the position adjustment mechanism includes a moving mechanism; the throttling element comprises a fixed throttling element and a sliding plate, and the fixed throttling element is fixedly arranged in the pipeline; the fixed throttling element is provided with a circulation hole along the axial direction of the pipeline; the sliding plate is inserted on the fixed throttling element along the radial direction of the pipeline, and the sliding plate penetrates through the circulation hole of the fixed throttling element; the sliding plate is connected with the moving mechanism, and the moving mechanism drives the sliding plate to move up and down to realize the position conversion of the sliding plate relative to the fixed throttling element, so that the size of the flow area in the flow hole of the fixed throttling element is changed, and the flow measurement range of the throttling device is expanded;
the front part and the rear part of the pipeline are respectively provided with a second high-pressure-taking hole and a second low-pressure-taking hole, and the fixed throttling piece is positioned between the second high-pressure-taking hole and the second low-pressure-taking hole.
Preferably, the pipeline comprises a third small-diameter pipe, a third middle-diameter pipe, a third large-diameter pipe and a third outlet pipe, and the third small-diameter pipe, the third middle-diameter pipe, the third large-diameter pipe and the third outlet pipe are communicated in sequence from front to back;
the throttling element comprises an annular plate, and the position adjusting mechanism comprises a moving mechanism; the annular plate is provided with three positions in the pipeline, namely a position C in the third small-diameter pipe, a position D in the third medium-diameter pipe and a position E in the third large-diameter pipe; the moving mechanism drives the annular plate to move back and forth to realize the switching of the annular plate among the position C, the position D and the position E, thereby expanding the flow measurement range of the throttling device;
when the annular plate is positioned at the position C in the third small-diameter pipe, a third small annular gap with a small flow-through area is formed between the annular plate and the third small-diameter pipe, and the throttling device can measure the small flow of a medium in the pipeline; when the annular plate is located at the position D in the third medium-diameter pipe, a third medium-diameter gap with a medium flow through area is formed between the annular plate and the third medium-diameter pipe, and the throttling device can measure the medium flow in the pipeline; when the annular plate is positioned at the position E in the third large-diameter pipe, a third large gap with a large flow area is formed between the annular plate and the third large-diameter pipe, and the throttling device can measure the large flow of the medium in the pipeline;
and a third high-pressure tapping hole is formed in the third small-diameter pipe, a third low-pressure tapping hole is formed in the third outlet pipe, and the third high-pressure tapping hole and the third low-pressure tapping hole are used for obtaining a differential pressure value.
Preferably, the position adjustment mechanism includes a moving mechanism; the throttling element comprises a fixed throttling plate and a movable column body, and the fixed throttling plate is fixedly arranged in the pipeline; the fixed throttle plate is provided with an opening along the axial direction of the pipeline;
the movable column body is provided with two positions in the pipeline, namely a position F in the opening of the fixed throttle plate and a position G in the pipeline; the moving mechanism is connected with the movable column body and drives the movable column body to move back and forth to realize the switching of the movable column body between a position F and a position G, so that the flow measurement range of the throttling device is expanded;
when the movable column body is positioned at the position F in the opening hole of the fixed throttle plate, a No. four small annular gap with a small flow area is formed between the movable column body and the opening hole of the fixed throttle plate, and the throttle device can measure the small flow of a medium in the pipeline; when the movable column body is positioned at a position G in the pipeline, the opening of the fixed throttle plate is a large four-size clearance with a large flow area, and the throttle device can measure the large flow of a medium in the pipeline;
four high-pressure taking holes and four low-pressure taking holes are respectively arranged on the front part and the rear part of the pipeline, and the four high-pressure taking holes and the four low-pressure taking holes are used for obtaining differential pressure values.
Preferably, the position adjustment mechanism includes a rotation mechanism; the throttling element comprises a perforated plate A and a perforated plate B, and the perforated plate A and the perforated plate B are fixed on the rotating shaft A in a crossed manner; the perforated plate A is provided with a through hole A, the perforated plate B is provided with a through hole B, and the flow areas among the perforated plate A, the perforated plate B and the pipeline are different due to the different sizes of the through hole A and the through hole B; the rotating mechanism drives the rotating shaft A to rotate so as to drive the porous plate A and the porous plate B to rotate to realize the switching of the large and small flow areas between the porous plate A and the pipeline, so that the flow measurement range of the throttling device is expanded;
the front part and the rear part of the pipeline are respectively provided with a fifth high-pressure taking hole and a fifth low-pressure taking hole, the porous plate A and the porous plate B are positioned between the fifth high-pressure taking hole and the fifth low-pressure taking hole, and the fifth high-pressure taking hole and the fifth low-pressure taking hole are used for obtaining a differential pressure value.
Preferably, the position adjustment mechanism includes a rotation mechanism; the throttling element comprises a large annular plate and a small annular plate, the large annular plate and the small annular plate are fixed on the rotating shaft B in a crossed manner, and the large annular plate and the small annular plate are different in size, so that the flow areas between the large annular plate and the small annular plate and the pipeline are different;
the rotating mechanism drives the rotating shaft B to rotate so as to drive the large annular plate and the small annular plate to rotate to realize the switching of large and small flow areas between the large annular plate and the small annular plate and the pipeline, so that the flow measurement range of the throttling device is expanded;
the front part and the rear part of the pipeline are respectively provided with a sixth high-pressure tapping hole and a sixth low-pressure tapping hole, the large annular plate and the small annular row plate are positioned between the sixth high-pressure tapping hole and the sixth low-pressure tapping hole, and the sixth high-pressure tapping hole and the sixth low-pressure tapping hole are used for obtaining a differential pressure value.
Further, the throttling element is a plate-shaped body or a cylinder or a sphere.
Further, the cross section of the pipeline is circular or rectangular.
The method for widening the flow measurement range of the throttling device changes the flow area between the throttling element and the pipeline by changing the position of the throttling element in the pipeline on the basis of the traditional throttling device, thereby achieving the purpose of expanding the flow measurement range of the throttling device; the throttling device for expanding the flow measurement range by using the method has the advantages of simple structure and lower cost, and can better meet the wide range requirement of medium measurement.
Drawings
Fig. 1 is a schematic structural diagram of a throttling device according to an embodiment.
Fig. 2 is a schematic structural diagram of a second throttling device according to an embodiment.
Fig. 3 is a schematic structural diagram of a three-throttling device according to an embodiment.
FIG. 4 is a schematic structural diagram of a fourth throttle device according to an embodiment.
Fig. 5 is a side view of fig. 4.
FIG. 6 is a schematic structural diagram of a fifth throttle device according to an embodiment.
Fig. 7 is a side view of fig. 6.
FIG. 8 is a schematic structural view of a sixth embodiment of a throttle apparatus.
Fig. 9 is a side view of fig. 8.
Fig. 10 is a schematic diagram of the position relationship between the large ring plate and the small ring plate in fig. 8.
In the figure: 11. a first high-pressure tapping hole; 12. a small annular gap No. one; 13. a first large diameter tube; 14. large annular gap number one; 15. a first low-pressure tapping hole; 16. a first small diameter tube;
21. a second high-pressure tapping hole; 22. a slide plate; 23. a second low-pressure tapping hole; 24. a fixed choke; 25. a flow-through hole;
31. a third large diameter pipe; 32. a third high-pressure tapping hole; 33. a large annular gap No. III; 34. outlet pipe III; 35. a third low-pressure tapping hole; 36. a small annular gap No. III; 37. a third small diameter tube; 38. a third medium diameter pipe; 39. the third middle ring gap;
41. a fourth high-pressure tapping hole; 42. a small annular gap No. four; 43. a fourth low-pressure tapping hole; 44. fixing the throttle plate; 45. a large annular gap No. four;
51. a fifth high-pressure tapping hole; 52. a perforated plate A; 53. a perforated plate B; 54. a fifth low-pressure taking hole; 55. a rotating shaft A;
61. a large annular plate; 62. a sixth high-pressure tapping hole; 63. a small annular plate; 64. a sixth low-pressure tapping hole; 65. a rotating shaft B; 66. the large annular plate and the flow area between the pipes.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
A method for widening the flow measurement range of a throttling device comprises a pipeline, wherein a throttling piece is arranged in the pipeline, and the throttling piece is connected with a position adjusting mechanism for changing the position of the throttling piece; the throttling element is a plate-shaped body or a cylinder or a sphere and is not limited to the shapes; the cross-section of the conduit is circular or rectangular and is not limited to these shapes. The position of the throttling element in the pipeline is changed through the position adjusting mechanism, and the flow area between the throttling element and the pipeline is changed, so that the flow measurement range of the throttling device is expanded.
The first embodiment,
As shown in fig. 1, a method for widening a flow measurement range of a throttling device includes a pipe in which a throttling member is disposed, the throttling member being connected with a position adjusting mechanism for changing a position of the throttling member; the position of the throttling element in the pipeline is changed through the position adjusting mechanism, and the flow area between the throttling element and the pipeline is changed, so that the flow measurement range of the throttling device is expanded.
The pipeline comprises a first small-diameter pipe 16, a first large-diameter pipe 13 and a first outlet pipe 18, wherein the first small-diameter pipe 16, the first large-diameter pipe 13 and the first outlet pipe 18 are communicated in sequence from front to back; the throttling element comprises an annular plate, and the position adjusting mechanism comprises a moving mechanism; the annular plate has two positions in the pipeline, namely a position A in the first small-diameter pipe 16 and a position B in the first large-diameter pipe 13; the moving mechanism drives the annular plate to move back and forth to realize the switching of the annular plate between the position A and the position B, so that the flow measurement range of the throttling device is expanded. The moving mechanism is set by adopting the conventional technical means in the field, for example, a notch is formed in the first large-diameter pipe 13, a rod-shaped part penetrates through the notch and then is connected with the annular plate, and the rod-shaped part is driven by power sources such as manpower or electric power to move so as to drag the annular plate to move, so that the position of the annular plate is switched.
When the annular plate is positioned at the position A in the first small-diameter pipe 16, a first small annular gap 12 with a small flow area is formed between the annular plate and the first small-diameter pipe 16, and at the moment, the throttling device can measure the small flow of a medium in the pipeline; when the annular plate is positioned at the position B in the first large-diameter pipe 13, a first large clearance 14 with a large flow area is formed between the annular plate and the first large-diameter pipe 13, and the throttling device can measure the large flow of a medium in the pipeline;
a first high-pressure taking hole 11 is formed in the first small-diameter pipe 16, a first low-pressure taking hole 15 is formed in the first outlet pipe 18, and the first high-pressure taking hole 11 and the first low-pressure taking hole 15 are used for obtaining a differential pressure value.
Example II,
As shown in fig. 2, a method for widening a flow measurement range of a throttling device includes a pipe in which a throttling member is disposed, the throttling member being connected with a position adjusting mechanism for changing a position of the throttling member; the position of the throttling element in the pipeline is changed through the position adjusting mechanism, and the flow area between the throttling element and the pipeline is changed, so that the flow measurement range of the throttling device is expanded.
The position adjusting mechanism comprises a moving mechanism; the throttling element comprises a fixed throttling element 24 and a sliding plate 22, and the fixed throttling element 24 is fixedly arranged in the pipeline; the fixed throttling element 24 is provided with a flow hole 25 along the axial direction of the pipeline; the sliding plate 22 is inserted on the fixed throttling element 24 along the radial direction of the pipeline, and the sliding plate 22 penetrates through the flow hole 25 of the fixed throttling element 24; the sliding plate 22 is connected with a moving mechanism, and the moving mechanism drives the sliding plate 22 to move up and down to realize the position conversion of the sliding plate 22 relative to the fixed throttling element 24, so that the size of the flow area in the flow hole 25 of the fixed throttling element 24 is changed, and the flow measurement range of the throttling device is expanded; the moving mechanism is set by adopting a conventional technical means in the field, for example, a notch is formed in a pipeline, a worm penetrates through the notch and then is connected with the sliding plate 22, another worm wheel is meshed with the worm, the worm wheel is driven to rotate by a power source such as manpower or electric power, the worm wheel and worm drive changes the rotation of the worm wheel into the linear motion of the worm, the worm moves up and down linearly to drive the sliding plate 22 to move up and down, and the position of the sliding plate 22 is changed.
The sliding plate 22 is a plate-shaped object which can move up and down, and holes can be formed in the sliding plate 22 or not; when the sliding plate 22 moves downwards, the flow area of the flow hole 25 of the fixed throttling element 24 is reduced, and the small flow of the medium in the pipe is measured by the throttling device; when the slide plate 22 moves upwards, the flow area of the flow hole 25 of the fixed throttling element 24 is increased, and at the moment, the throttling device is used for measuring the medium flow in the pipe, so that the flow measuring range of the throttling device is expanded.
The front part and the rear part of the pipeline are respectively provided with a second high-pressure taking hole 21 and a second low-pressure taking hole 23, and the fixed throttling piece 24 is positioned between the second high-pressure taking hole 21 and the second low-pressure taking hole 23.
Example III,
As shown in fig. 3, a method for widening a flow measurement range of a throttling device includes a pipe in which a throttling member is disposed, the throttling member being connected with a position adjusting mechanism for changing a position of the throttling member; the position of the throttling element in the pipeline is changed through the position adjusting mechanism, and the flow area between the throttling element and the pipeline is changed, so that the flow measurement range of the throttling device is expanded.
The pipeline comprises a third small-diameter pipe 37, a third middle-diameter pipe 38, a third large-diameter pipe 31 and a third outlet pipe 34, wherein the third small-diameter pipe 37, the third middle-diameter pipe 38, the third large-diameter pipe 31 and the third outlet pipe 34 are communicated in sequence from front to back;
the throttling element comprises an annular plate, and the position adjusting mechanism comprises a moving mechanism; the annular plate has three positions in the pipeline, namely a position C in the third small-diameter pipe 37, a position D in the third medium-diameter pipe 38 and a position E in the third large-diameter pipe 31; the moving mechanism drives the annular plate to move back and forth to realize the switching of the annular plate among the position C, the position D and the position E, thereby expanding the flow measurement range of the throttling device; the moving mechanism is set by adopting the conventional technical means in the field, for example, a notch is formed in the third large-diameter pipe 31, a rod-shaped part penetrates through the notch and then is connected with the annular plate, and the rod-shaped part is driven by power sources such as manpower or electric power to move so as to drag the annular plate to move, so that the position of the annular plate is switched.
When the annular plate is positioned at the position C in the third small-diameter pipe 37, a third small annular gap 36 with a small flow area is formed between the annular plate and the third small-diameter pipe 37, and at the moment, the throttling device can measure the small flow of the medium in the pipeline; when the annular plate is positioned at the position D in the third medium-diameter pipe 38, a third medium gap 39 with a medium flow area is formed between the annular plate and the third medium-diameter pipe 38, and the throttling device can measure the medium flow in the pipeline; when the annular plate is positioned at the position E in the third large-diameter pipe 31, a third large clearance 33 with a large flow area is formed between the annular plate and the third large-diameter pipe 31, and the throttling device can measure the large flow of the medium in the pipeline;
the third small-diameter pipe 37 is provided with a third high-pressure tapping hole 32, the third outlet pipe 34 is provided with a third low-pressure tapping hole 35, and the third high-pressure tapping hole 32 and the third low-pressure tapping hole 35 are used for obtaining a differential pressure value.
Example four,
As shown in fig. 4 and 5, a method for widening a flow measurement range of a throttling device comprises a pipeline, a throttling piece is arranged in the pipeline, and a position adjusting mechanism for changing the position of the throttling piece is connected with the throttling piece; the position of the throttling element in the pipeline is changed through the position adjusting mechanism, and the flow area between the throttling element and the pipeline is changed, so that the flow measurement range of the throttling device is expanded.
The position adjusting mechanism comprises a moving mechanism; the throttling element comprises a fixed throttling plate 44 and a movable column body, and the fixed throttling plate 44 is fixedly arranged in the pipeline; the fixed throttle plate 44 is provided with an opening along the axial direction of the pipeline;
the movable column has two positions in the pipeline, namely a position F in the opening of the fixed throttle plate 44 and a position G in the pipeline; the moving mechanism is connected with the movable column body and drives the movable column body to move back and forth to realize the switching of the movable column body between a position F and a position G, so that the flow measurement range of the throttling device is expanded; the moving mechanism is set by adopting the conventional technical means in the field, for example, a notch is formed in the pipeline, a rod-shaped part penetrates through the notch and then is connected with the movable column body, and the rod-shaped part is driven by power sources such as manpower or electric power to move so as to drag the movable column body to move, and then the position of the movable column body is switched.
When the movable column body is positioned at the position F in the opening of the fixed throttle plate 44, a No. four small annular gap 42 with a small flow area is formed between the movable column body and the opening of the fixed throttle plate 44, and at the moment, the throttling device can measure the small flow of the medium in the pipeline; when the movable column body is positioned at a position G in the pipeline, the opening of the fixed throttle plate 44 is a large four-size clearance 45 with a large flow area, and the throttle device can measure the large flow of a medium in the pipeline;
four high-pressure sampling holes 41 and four low-pressure sampling holes 43 are respectively arranged on the front part and the rear part of the pipeline, and the four high-pressure sampling holes 41 and the four low-pressure sampling holes 43 are used for obtaining differential pressure values.
Example V,
As shown in fig. 6 and 7, a method for widening the flow measurement range of a throttling device comprises a pipeline, a throttling piece is arranged in the pipeline, and a position adjusting mechanism for changing the position of the throttling piece is connected with the throttling piece; the position of the throttling element in the pipeline is changed through the position adjusting mechanism, and the flow area between the throttling element and the pipeline is changed, so that the flow measurement range of the throttling device is expanded.
The position adjusting mechanism comprises a rotating mechanism; the throttling element comprises a perforated plate A52 and a perforated plate B53, wherein the perforated plate A52 and the perforated plate B53 are fixed on the rotating shaft A55 in a crossed manner; the perforated plate A52 is provided with a through hole A, the perforated plate B53 is provided with a through hole B, and the sizes of the through hole A and the through hole B are different, so that the flow areas among the perforated plate A52, the perforated plate B53 and the pipeline are different; the rotating mechanism drives the rotating shaft A55 to rotate, so that the perforated plate A52 and the perforated plate B53 are driven to rotate to realize the switching of the large and small flow areas between the perforated plate A52 and the pipeline, and the flow measurement range of the throttling device is expanded; the slewing mechanism chooses the conventional technological means in this field to set up for use, for example, the notch on the pipeline, the upper end of pivot A55 meets with adjustment handle after wearing out the pipeline through the notch, thereby power sources such as manpower or electric power drive adjustment handle and rotate and realize perforated plate A52, perforated plate B53's rotation, thereby realize perforated plate A52, the change of perforated plate B53 position, and then realize the change of flow area between perforated plate and the pipeline, when small flow of throttling arrangement measurable pipeline in the flow area medium, when big flow area throttling arrangement measurable pipeline in the large-traffic of medium.
The front part and the rear part of the pipeline are respectively provided with a fifth high-pressure sampling hole 51 and a fifth low-pressure sampling hole 54, the porous plate A52 and the porous plate B53 are positioned between the fifth high-pressure sampling hole 51 and the fifth low-pressure sampling hole 54, and the fifth high-pressure sampling hole 51 and the fifth low-pressure sampling hole 54 are used for obtaining a differential pressure value.
Example six,
As shown in fig. 8 to 10, a method for widening a flow measurement range of a throttling device includes a pipe in which a throttling member is disposed, the throttling member being connected with a position adjusting mechanism for changing a position of the throttling member; the position of the throttling element in the pipeline is changed through the position adjusting mechanism, and the flow area between the throttling element and the pipeline is changed, so that the flow measurement range of the throttling device is expanded. The position adjusting mechanism comprises a rotating mechanism; the throttling element comprises a large annular plate 61 and a small annular plate 63, the large annular plate 61 and the small annular plate 63 are fixed on a rotating shaft B65 in a crossed manner, and the large annular plate 61 and the small annular plate 63 are different in size, so that the flow areas between the large annular plate 61 and the small annular plate 63 and the pipeline are different;
the rotating mechanism drives the rotating shaft B65 to rotate so as to drive the large annular plate 61 and the small annular plate 63 to rotate to realize the switching of the large and small flow areas with the pipeline, so that the flow measurement range of the throttling device is expanded; the rotating mechanism is arranged by adopting a conventional technical means in the field, for example, a notch is formed in the pipeline, the upper end of the rotating shaft B65 penetrates out of the pipeline through the notch and then is connected with the adjusting handle, the adjusting handle is driven to rotate by a power source such as manpower or electric power, so that the large annular plate 61 and the small annular plate 63 can rotate, the positions of the large annular plate 61 and the small annular plate 63 can be changed, the change of the flow area between the annular plates and the pipeline can be further realized, when the flow area is small, the throttling device can measure the small flow of a medium in the pipeline, and when the flow area is large, the throttling device can measure the large flow of the medium in the pipeline.
The front part and the rear part of the pipeline are respectively provided with a sixth high-pressure taking hole 62 and a sixth low-pressure taking hole 64, the large annular plate 61 and the small annular plate 63 are positioned between the sixth high-pressure taking hole 62 and the sixth low-pressure taking hole 64, and the sixth high-pressure taking hole 62 and the sixth low-pressure taking hole 64 are used for obtaining a differential pressure value.
After the throttling device is widened by the method, the flow measurement range (measurement range) of the throttling device is at least improved to 2 times of that of the existing traditional throttling device, so that the wide measurement range is equivalent to that at least two existing traditional throttling measurement devices are arranged on the pipeline with the same specification.
The above embodiments are not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make variations, modifications, additions or substitutions within the technical scope of the present invention.
Claims (9)
1. A method for broadening the flow measurement range of a throttling device, the throttling device comprising a conduit, characterized by: a throttling piece is arranged in the pipeline, and the throttling piece is connected with a position adjusting mechanism for changing the position of the throttling piece; the position of the throttling element in the pipeline is changed through the position adjusting mechanism, and the flow area between the throttling element and the pipeline is changed, so that the flow measurement range of the throttling device is expanded.
2. The method for broadening flow measurement range of a flow restriction device as defined in claim 1, wherein: the pipeline comprises a first small-diameter pipe (16), a first large-diameter pipe (13) and a first outlet pipe (18), wherein the first small-diameter pipe (16), the first large-diameter pipe (13) and the first outlet pipe (18) are communicated in sequence from front to back; the throttling element comprises an annular plate, and the position adjusting mechanism comprises a moving mechanism; the annular plate is provided with two positions in the pipeline, namely a position A in the first small-diameter pipe (16) and a position B in the first large-diameter pipe (13); the moving mechanism drives the annular plate to move back and forth to realize the switching of the annular plate between the position A and the position B, so that the flow measurement range of the throttling device is expanded;
when the annular plate is positioned at the position A in the first small-diameter pipe (16), a first small annular gap (12) with a small flow-through area is formed between the annular plate and the first small-diameter pipe (16), and the throttling device can measure the small flow of a medium in the pipeline; when the annular plate is positioned at the position B in the first large-diameter pipe (13), a first large clearance (14) with a large flow area is formed between the annular plate and the first large-diameter pipe (13), and the throttling device can measure the large flow of a medium in the pipeline;
a high-pressure taking hole (11) is formed in the first small-diameter pipe (16), a low-pressure taking hole (15) is formed in the first outlet pipe (18), and the first high-pressure taking hole (11) and the first low-pressure taking hole (15) are used for obtaining a differential pressure value.
3. The method for broadening flow measurement range of a flow restriction device as defined in claim 1, wherein: the position adjusting mechanism comprises a moving mechanism; the throttling element comprises a fixed throttling element (24) and a sliding plate (22), and the fixed throttling element (24) is fixedly arranged in the pipeline; the fixed throttling piece (24) is provided with a flow hole (25) along the axial direction of the pipeline; the sliding plate (22) is inserted on the fixed throttling element (24) along the radial direction of the pipeline, and the sliding plate (22) penetrates through a flow hole (25) of the fixed throttling element (24); the sliding plate (22) is connected with a moving mechanism, and the moving mechanism drives the sliding plate (22) to move up and down to realize the position conversion of the sliding plate (22) relative to the fixed throttling element (24), so that the size of the flow area in the flow hole (25) of the fixed throttling element (24) is changed, and the flow measurement range of the throttling device is expanded;
the front part and the rear part of the pipeline are respectively provided with a second high-pressure taking hole (21) and a second low-pressure taking hole (23), and the fixed throttling piece (24) is positioned between the second high-pressure taking hole (21) and the second low-pressure taking hole (23).
4. The method for broadening flow measurement range of a flow restriction device as defined in claim 1, wherein: the pipeline comprises a third small-diameter pipe (37), a third middle-diameter pipe (38), a third large-diameter pipe (31) and a third outlet pipe (34), wherein the third small-diameter pipe (37), the third middle-diameter pipe (38), the third large-diameter pipe (31) and the third outlet pipe (34) are communicated in sequence from front to back;
the throttling element comprises an annular plate, and the position adjusting mechanism comprises a moving mechanism; the annular plate is provided with three positions in the pipeline, namely a position C in the third small-diameter pipe (37), a position D in the third middle-diameter pipe (38) and a position E in the third large-diameter pipe (31); the moving mechanism drives the annular plate to move back and forth to realize the switching of the annular plate among the position C, the position D and the position E, so that the flow measurement range of the throttling device is expanded;
when the annular plate is positioned at the position C in the third small-diameter pipe (37), a third small annular gap (36) with a small flow-through area is formed between the annular plate and the third small-diameter pipe (37), and the throttling device can measure the small flow of a medium in the pipeline; when the annular plate is located at a position D in the third medium-diameter pipe (38), a third medium annular gap (39) with a medium flow area is formed between the annular plate and the third medium-diameter pipe (38), and the throttling device can measure the medium flow in the pipeline; when the annular plate is positioned at the position E in the third large-diameter pipe (31), a third large annular gap (33) with a large flow area is formed between the annular plate and the third large-diameter pipe (31), and the throttling device can measure the large flow of a medium in the pipeline;
and a third high-pressure taking hole (32) is formed in the third small-diameter pipe (37), a third low-pressure taking hole (35) is formed in the third outlet pipe (34), and the third high-pressure taking hole (32) and the third low-pressure taking hole (35) are used for obtaining a differential pressure value.
5. The method for broadening flow measurement range of a flow restriction device as defined in claim 1, wherein: the position adjusting mechanism comprises a moving mechanism; the throttling element comprises a fixed throttling plate (44) and a movable column body, and the fixed throttling plate (44) is fixedly arranged in the pipeline; the fixed throttle plate (44) is provided with an opening along the axial direction of the pipeline;
the movable column body is provided with two positions in the pipeline, namely a position F in the opening of the fixed throttle plate (44) and a position G in the pipeline; the moving mechanism is connected with the movable cylinder and drives the movable cylinder to move back and forth to realize the switching of the movable cylinder between a position F and a position G, so that the flow measurement range of the throttling device is expanded;
when the movable column body is positioned at a position F in the opening of the fixed throttle plate (44), a No. four small annular gap (42) with a small flow area is formed between the movable column body and the opening of the fixed throttle plate (44), and the throttle device can measure the small flow of a medium in the pipeline; when the movable column body is positioned at a position G in the pipeline, the opening of the fixed throttle plate (44) is a large four-size clearance (45) with a large flow area, and the throttle device can measure the large flow of a medium in the pipeline;
the front part and the rear part of the pipeline are respectively provided with a fourth high-pressure taking hole (41) and a fourth low-pressure taking hole (43), and the fourth high-pressure taking hole (41) and the fourth low-pressure taking hole (43) are used for obtaining a differential pressure value.
6. The method for broadening flow measurement range of a flow restriction device as defined in claim 1, wherein: the position adjusting mechanism comprises a rotating mechanism; the throttling piece comprises a porous plate A (52) and a porous plate B (53), and the porous plate A (52) and the porous plate B (53) are fixed on the rotating shaft A (55) in a crossed manner; the perforated plate A (52) is provided with a through hole A, the perforated plate B (53) is provided with a through hole B, and the sizes of the through hole A and the through hole B are different, so that the flow areas among the perforated plate A (52), the perforated plate B (53) and the pipeline are different; the rotating mechanism drives the rotating shaft A (55) to rotate so as to drive the porous plate A (52) and the porous plate B (53) to rotate to realize the switching of the large and small flow areas between the porous plates A (52) and the pipeline, so that the flow measurement range of the throttling device is expanded;
the pressure measuring device is characterized in that a fifth high-pressure measuring hole (51) and a fifth low-pressure measuring hole (54) are respectively formed in the front part and the rear part of the pipeline, a porous plate A (52) and a porous plate B (53) are located between the fifth high-pressure measuring hole (51) and the fifth low-pressure measuring hole (54), and the fifth high-pressure measuring hole (51) and the fifth low-pressure measuring hole (54) are used for obtaining a differential pressure value.
7. The method for broadening flow measurement range of a flow restriction device as defined in claim 1, wherein: the position adjusting mechanism comprises a rotating mechanism; the throttling element comprises a large annular plate (61) and a small annular plate (63), the large annular plate (61) and the small annular plate (63) are fixed on the rotating shaft B (65) in a crossed manner, and the large annular plate (61) and the small annular plate (63) are different in size, so that the flow areas between the large annular plate (61) and the small annular plate (63) and the pipeline are different;
the rotating mechanism drives the rotating shaft B (65) to rotate so as to drive the large annular plate (61) and the small annular plate (63) to rotate to realize the switching of the large and small flow areas between the large annular plate and the pipeline, so that the flow measurement range of the throttling device is expanded;
the pipeline is characterized in that a sixth high-pressure taking hole (62) and a sixth low-pressure taking hole (64) are respectively formed in the front part and the rear part of the pipeline, the large annular plate (61) and the small annular plate (63) are located between the sixth high-pressure taking hole (62) and the sixth low-pressure taking hole (64), and the sixth high-pressure taking hole (62) and the sixth low-pressure taking hole (64) are used for obtaining a differential pressure value.
8. The method for broadening flow measurement range of a flow restriction device as defined in claim 1, wherein: the throttling element is a plate-shaped body or a cylinder or a sphere.
9. The method for broadening flow measurement range of a flow restriction device as defined in claim 1, wherein: the cross section of the pipeline is circular or rectangular.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911053377.2A CN110672167A (en) | 2019-10-31 | 2019-10-31 | Method for widening flow measurement range of throttling device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911053377.2A CN110672167A (en) | 2019-10-31 | 2019-10-31 | Method for widening flow measurement range of throttling device |
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| CN110672167A true CN110672167A (en) | 2020-01-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111661678A (en) * | 2020-07-17 | 2020-09-15 | 中煤天津设计工程有限责任公司 | Multistage auto-change over device of duplex position loading system material stream |
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