CN113685643B - Reducing orifice plate - Google Patents
Reducing orifice plate Download PDFInfo
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- CN113685643B CN113685643B CN202110993575.8A CN202110993575A CN113685643B CN 113685643 B CN113685643 B CN 113685643B CN 202110993575 A CN202110993575 A CN 202110993575A CN 113685643 B CN113685643 B CN 113685643B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/027—Throttle passages
- F16L55/02709—Throttle passages in the form of perforated plates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/027—Throttle passages
- F16L55/02709—Throttle passages in the form of perforated plates
- F16L55/02718—Throttle passages in the form of perforated plates placed transversely
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
In order to solve the technical problem that time and labor are consumed when the orifice plate needs to be disassembled and reprocessed and installed for many times in the process of accurately designing the orifice plate in the prior art, the embodiment of the invention provides a reducing orifice plate, which comprises the following components: the mounting plate is used for rotatably arranging a plurality of aperture adjusting plates; the second forming surfaces of all the aperture adjusting plates form a circular throttling hole together; and the transmission mechanism is in transmission connection with each aperture adjusting plate and is used for synchronously changing the rotation angle of each aperture adjusting plate so as to change the diameter of the throttling hole. According to the embodiment of the invention, the diameter of the throttling hole formed by the second forming surfaces of all the aperture adjusting plates is adjusted by adjusting the rotating angles of the aperture adjusting plates, so that the aperture of the throttling hole plate is changed, repeated assembly and disassembly and re-processing installation in the design process of the throttling hole plate are avoided, and the test efficiency is improved.
Description
Technical Field
The invention relates to a reducing orifice plate.
Background
Orifice plates are common resistance elements in fluid conveying piping systems and are widely used because of their simple structure, which plays a significant role in the system. When water flows through the orifice plate, a throttling contraction surface is formed behind the orifice plate due to the self characteristics of the orifice plate structure. The flow velocity of the fluid is at a maximum at the constriction surface while the pressure is at a minimum. Once the pressure at the converging face is less than the saturated vapor pressure of water, the water vaporizes and generates a large number of vapor bubbles, which collapse when subjected to a pressure greater than the vaporization pressure as they move to the high pressure region downstream of the orifice plate.
The collapse time of the vapor bubble is very short, only a few hundredths of a second, but the generated impact force is very large, the local pressure at the collapse position of the vapor bubble is as high as dozens of megapascals or even hundreds of megapascals, the local temperature is also increased sharply, and the continuous collapse of a large amount of vapor bubbles can generate strong noise and high-frequency vibration, thereby seriously affecting the normal flow of liquid and the normal work of fluid machinery.
Therefore, how to meet the system function and prevent vaporization is a difficult point for the treatment and research of pipeline vibration exceeding caused by vaporization of the orifice plate. In the design and modification of such pipelines, a design method which needs to satisfy both the function and vibration reduction has to be faced.
Designing the orifice plate first requires ensuring that the pressure at the flow contracting surface behind the orifice plate is above the saturated vapor pressure of water. The traditional theoretical methods for designing the orifice plate are more, the referenced specifications comprise DL/T5054, HG/T20570 and GB/T2624, and the aperture can be determined by using a method related to the calculation of the resistance coefficient of the orifice plate by using a relevant mechanical design manual. The formulas used in these standards have general similarity, with the difference being the conversion of different dimensions. The design of these formulas is focused on meeting the hydraulic characteristics of the system, and the number of vaporizations is also used to determine whether the orifice plate is designed to eliminate vaporizations. However, the orifice plates designed solely by these methods may not be as effective in improving vaporization in practical use. The resistance coefficient of the throttling orifice plate to water power is sensitive to the aperture, and the orifice plate designed by an empirical formula and a CFD (computational fluid dynamics) technology is usually required to be verified and used by an actual loop.
However, under the condition that the requirement of the pipeline system on the fluid resistance is relatively accurate, the aperture of the orifice plate is difficult to be accurately designed at one time, and accurate results can be obtained through repeated tests.
In the repeated test process, the orifice plate needs to be disassembled, re-processed, installed and the like for many times, which is time-consuming and labor-consuming, and is not favorable for the precise design of the orifice plate.
Disclosure of Invention
In order to solve the technical problem that time and labor are consumed when the throttling orifice plate needs to be disassembled and reprocessed and installed for multiple times in the process of accurately designing the throttling orifice plate in the prior art, the embodiment of the invention provides a reducing throttling orifice plate.
The embodiment of the invention is realized by the following technical scheme:
the embodiment of the invention provides a reducing orifice plate, which comprises:
the mounting plate is used for rotatably arranging a plurality of aperture adjusting plates;
the second molding surfaces of all the aperture adjusting plates form a circular throttling hole together; and
and the transmission mechanism is in transmission connection with each aperture adjusting plate and is used for synchronously changing the rotation angle of each aperture adjusting plate so as to change the diameter of the throttling hole.
Further, the orifice plate further comprises an angle adjusting device; the angle adjusting device includes:
the rotary turntable is arranged on the mounting plate and is in transmission connection with the transmission mechanism, so that when the rotary turntable rotates, the transmission mechanism drives each aperture adjusting plate to synchronously rotate to change the rotating angle of each aperture adjusting plate so as to change the diameter of the throttling hole.
Further, the angle adjusting device further includes:
the pointer is arranged on the rotary turntable; and
the dial is used for being arranged on the mounting plate on the outer side of the rotary turntable, and a plurality of angle scales are arranged at the corresponding positions of the dial and a pointer of the rotary turntable so as to indicate the rotating angle of the rotary turntable through the pointer when the rotary turntable rotates.
Further, the second molding surface has a spiral shape, and the spiral shape conforms to the following spiral polar coordinate formula:
ρ＝ρ 0 +aθ
wherein rho is the pole diameter, theta is the pole angle, a is a constant greater than zero, rho 0 The starting diameter.
Furthermore, a knob is arranged on the rotary turntable.
Further, the transmission mechanism comprises a circular transmission piece;
each aperture adjusting plate is arranged in the annular transmission part and is rotationally connected with the mounting plate; an inner transmission part is arranged along the circumferential direction of the inner wall of the annular transmission part; each aperture adjusting plate is provided with an arc-shaped transmission part;
the arc-shaped transmission part of each aperture adjusting plate is in transmission connection with the inner transmission part, so that when the circular transmission part rotates, the inner transmission part drives each aperture adjusting plate to synchronously change the rotation angle so as to change the diameter of the throttling hole;
an outer transmission part is arranged on the outer side of the circular transmission part, and the rotary turntable is in transmission connection with the outer transmission part.
Further, the circular transmission part is a circular transmission gear; the inner transmission part is a plurality of inner teeth arranged on the inner side circumference of the annular transmission gear; the outer transmission part is a plurality of outer teeth arranged on the outer circumference of the circular transmission gear; the outer side of the rotating turntable is circumferentially provided with rotating teeth, and the rotating teeth are meshed with the outer teeth; arc drive division is for locating the driving gear that is arc distribution on the aperture regulating plate, driving gear and internal toothing.
Further, the plurality of aperture adjusting plates are distributed on the mounting plate in two layers;
the first layer of aperture adjusting plates are uniformly distributed on the mounting plate in a circular shape, each aperture adjusting plate of the first layer of aperture adjusting plates is rotatably connected with the mounting plate, and each aperture adjusting plate of the first layer of aperture adjusting plates is in transmission connection with the inner side of the circular transmission piece;
the aperture adjusting plates of the second layer are uniformly distributed on the aperture adjusting plates of the first layer in a circular shape, each aperture adjusting plate of the aperture adjusting plates of the second layer is rotatably connected with the mounting plate, and each aperture adjusting plate of the aperture adjusting plates of the second layer is in transmission connection with the inner side of the circular transmission piece;
the number of the aperture adjusting plates of the first layer is the same as that of the aperture adjusting plates of the second layer;
the central angles between any two adjacent aperture-adjusting plates of the first layer are the same.
The central angles between any two adjacent aperture-adjusting plates of the second layer are the same.
Further, the number of the aperture adjusting plates of the first layer is 6, the number of the aperture adjusting plates of the second layer is 6, and the central angle between any two adjacent aperture adjusting plates of the first layer is 60 degrees; the central angle between any two adjacent aperture-adjusting plates of the second layer is 60 degrees; the central angle between any two adjacent aperture-regulating plates of the aperture-regulating plate of the first layer and the aperture-regulating plate of the second layer was 30 °.
Further, the aperture adjustment plate further comprises a first molding surface, a third molding surface and a fourth molding surface; the third molding surfaces of any two adjacent aperture-adjusting plates of the aperture-adjusting plate of the first layer and the aperture-adjusting plate of the second layer are in sealing contact;
the reducing orifice plate also comprises a plurality of leakage-proof sealing plates; each of the leak-proof sealing plates includes:
the first leakage-proof sealing plate is connected with the second leakage-proof sealing plate through a torsional spring and is provided with a first sealing forming surface and a second sealing forming surface;
a first seal land for sealing contact with the first forming surface of the aperture plate of the second layer;
a second seal molding surface for sealing contact with the upper side of the aperture regulating plate of the first layer;
the second leakage-proof sealing plate is provided with a third sealing forming surface and a fourth sealing forming surface;
a third seal molding surface for sealing contact with the mounting plate; and
a fourth seal land for sealing contact with the third land of the aperture plate of the first layer;
the first seal forming surface is adapted to the shape of the first forming surface, and the fourth seal forming surface is adapted to the shape of the fourth forming surface.
Compared with the prior art, the embodiment of the invention has the following advantages and beneficial effects:
according to the reducing orifice plate provided by the embodiment of the invention, the diameter of the orifice surrounded by the second molding surfaces of all the aperture adjusting plates is adjusted by adjusting the rotating angles of the aperture adjusting plates, so that the orifice aperture of the orifice plate is changed, repeated assembly and disassembly and re-processing installation in the orifice plate design process are avoided, and the test efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of a variable diameter orifice plate configuration.
Fig. 2 is a schematic diagram of an internal structure of the reducing orifice plate.
Fig. 3 is a schematic diagram of a structure of an aperture adjustment plate.
Fig. 4 is a schematic diagram of the dial structure.
Fig. 5 is a schematic structural diagram of a ring-shaped transmission gear.
FIG. 6 is a schematic view of the structure of the leakproof sealing plate.
Fig. 7 is a schematic view of a rotary turntable.
Fig. 8 is a schematic structural diagram of a single-orifice plate. Fig. 8a is a schematic structural diagram of a conventional single-hole orifice plate with a radius of 44 mm; fig. 8b is a schematic structural diagram of a conventional single-orifice plate with a radius of 7.2 mm.
Fig. 9 is a schematic structural diagram of a variable-diameter orifice plate. Wherein, fig. 9a is a schematic structural diagram of a reducing orifice plate with a radius of 44 mm; FIG. 9b is a schematic structural diagram of a reducing orifice plate with a radius of 7.2 mm.
FIG. 10 is a schematic diagram of a calculation result of a variable diameter orifice plate with a radius of 44 mm.
FIG. 11 is a diagram illustrating the calculation results of a single-orifice plate with a radius of 44 mm.
FIG. 12 is a schematic diagram of a calculation result of a variable aperture orifice plate with a radius of 7.2 mm.
FIG. 13 is a schematic diagram of a calculation result of a single-hole orifice plate with a radius of 7.2 mm.
Reference numbers and corresponding part names in the drawings:
wherein, 1-mounting plate; 2-aperture adjusting plate; 3, mounting a handle and a nameplate; 4-angle turning knob; 5-a dial scale; 6-a first leak-proof sealing plate; 7-a second leak-proof sealing plate; 8-ring-shaped transmission gear; 9-rotating the turntable; 10-a mounting shaft of an aperture-variable adjusting plate; 11-a torsion spring; 12-a gear tooth; 13-a third molding surface; 14-a second molding surface; 15-a fourth molding surface; 16-a first molding surface; 17-angle scale; 18-external teeth; 19-internal teeth; 20-a first seal molding surface; 21-a second seal molding surface; 22-a fourth seal molding surface; 23-a third seal molding surface; 24-rotating the teeth; 25-pointer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and the accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limiting the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the scope of the present invention.
Examples
In order to solve the technical problem that it takes time and labor to disassemble and rework the orifice plate in the process of accurately designing the orifice plate in the prior art, an embodiment of the present invention provides a reducing orifice plate, which is shown in fig. 1 to 7, and includes: the mounting plate 1 is provided with a plurality of aperture adjusting plates 2 in a rotating manner; a plurality of aperture-adjusting plates, wherein the second forming surfaces 14 of all the aperture-adjusting plates jointly form a circular orifice; and the transmission mechanism is in transmission connection with each aperture adjusting plate and is used for synchronously changing the rotation angle of each aperture adjusting plate so as to change the diameter of the throttling hole.
Therefore, the diameter of the circular throttling hole formed by the second forming surface of each aperture adjusting plate can be adjusted by adjusting the rotating angle of each aperture adjusting plate, and the problem of time and labor consumption caused by repeated disassembly and reassembly is avoided in the process of designing the throttling hole plate.
The embodiment of the invention provides the throttling orifice plate with the continuously adjustable aperture, which aims to design the single-orifice plate with the hydraulic characteristics same as the simulated aperture. Referring to fig. 3, optionally, the second forming surface is shaped as a spiral, said spiral conforming to the following spiral polar equation: ρ = ρ 0 + a θ where ρ is the pole diameter, θ is the pole angle, a is a constant greater than zero, ρ is 0 The starting diameter. Thereby ensuring that the diameter of the orifice enclosed by each of the second molding surfaces can be continuously adjusted.
The diameter of the throttling hole is accurately adjusted by conveniently and accurately adjusting the rotating angle of the aperture adjusting plate; further, the orifice plate further comprises an angle adjusting device; the angle adjusting device includes: and the rotary turntable 9 is arranged on the mounting plate 1 and is in transmission connection with a transmission mechanism, so that when the rotary turntable rotates, the transmission mechanism drives each aperture adjusting plate to synchronously rotate to change the rotation angle of each aperture adjusting plate so as to change the diameter of the throttling hole.
In order to facilitate accurate display of the rotation angle of the aperture adjustment plate, optionally, the angle adjustment apparatus further comprises:
a pointer 25 provided on the rotary table; and
the dial is used for being arranged on the mounting plate on the outer side of the rotary turntable, and a plurality of angle scales 17 are arranged at the positions, corresponding to the pointers of the rotary turntable, of the dial so that the rotating angles of the rotary turntable can be indicated through the pointers when the rotary turntable rotates.
Specifically, referring to fig. 1 to 4, the reducing orifice plate includes a mounting plate 1, an aperture adjusting plate 2, a handle and a nameplate 3, an angle turning knob 4, a rotary dial 9, and a dial 5 for displaying a turning angle. The dial is of an annular structure, and angle scales 17 are arranged on the annular structure; the dial is sleeved outside the rotary turntable 9 and is arranged on the mounting plate 1.
In order to adjust the rotation angle of the rotary turntable, the size of the aperture of the throttling hole of the cover plate is adjusted, and a knob 4 is arranged on the rotary turntable. The rotary knob 4 drives the rotary turntable 9 to rotate, a pointer of the rotary turntable indicates a corresponding angle scale 17, at the moment, the rotary turntable 9 is in transmission with the aperture adjusting plates 2 through the transmission mechanism, all the aperture adjusting plates rotate towards the same direction by the same angle, and then the second forming surface 14 of each aperture adjusting plate after rotation jointly forms a changed throttling hole.
After the second molding surface is reconstructed into a new orifice shape, the changed orifice radius has a geometrical relationship with the rotation angle, and is represented by r = f (alpha), and the shape of the second molding surface adopts ρ = ρ 0 Curve of + a θ. The curve ensures that the radius obtained during rotation is continuously variable, and the parameters in the above formula are determined according to specific requirements.
For better transmission, the transmission mechanism comprises a circular ring-shaped transmission piece;
each aperture adjusting plate is arranged in the annular transmission part and is rotationally connected with the mounting plate; an inner transmission part is arranged along the circumferential direction of the inner wall of the annular transmission part; each aperture adjusting plate is provided with an arc-shaped transmission part;
the arc-shaped transmission part of each aperture adjusting plate is in transmission connection with the inner transmission part, so that when the circular transmission part rotates, the inner transmission part drives each aperture adjusting plate to synchronously change the rotation angle so as to change the diameter of the throttling hole;
an outer transmission part is arranged on the outer side of the annular transmission part, and the rotary turntable is in transmission connection with the outer transmission part.
Further, the circular transmission part is a circular transmission gear 8; the inner transmission part is a plurality of inner teeth 19 arranged on the inner circumference of the circular transmission gear; the outer transmission part is a plurality of outer teeth 18 arranged on the outer circumference of the circular transmission gear; the outer side of the rotary turntable 9 is circumferentially provided with rotating teeth 24, and the rotating teeth 24 are meshed with the outer teeth 18; arc drive division is for locating the driving tooth 12 that is the arc and distributes on the aperture regulating plate, driving tooth 12 meshes with internal tooth 19.
Further, the plurality of aperture adjusting plates are distributed on the mounting plate in two layers;
the first layer of aperture adjusting plates are uniformly distributed on the mounting plate in a circular shape, each aperture adjusting plate of the first layer of aperture adjusting plates is rotatably connected with the mounting plate, and each aperture adjusting plate of the first layer of aperture adjusting plates is in transmission connection with the inner side of the circular transmission piece;
the aperture adjusting plates of the second layer are uniformly distributed on the aperture adjusting plates of the first layer in a circular shape, each aperture adjusting plate of the aperture adjusting plates of the second layer is rotatably connected with the mounting plate, and each aperture adjusting plate of the aperture adjusting plates of the second layer is in transmission connection with the inner side of the circular transmission piece;
the number of the aperture adjusting plates of the first layer is the same as that of the aperture adjusting plates of the second layer;
the central angles between any two adjacent aperture-adjusting plates of the first layer are the same.
The central angles between any two adjacent aperture-adjusting plates of the second layer are the same.
Further, the number of the aperture adjusting plates of the first layer is 6, the number of the aperture adjusting plates of the second layer is 6, and the central angle between any two adjacent aperture adjusting plates of the first layer is 60 degrees; the central angle between any two adjacent aperture-adjusting plates of the second layer is 60 degrees; the central angle between any two adjacent aperture-regulating plates of the aperture-regulating plate of the first layer and the aperture-regulating plate of the second layer was 30 °.
Referring to fig. 2, the 12-hole diameter adjusting plate 2 is mounted on the mounting plate by a mounting shaft 10, and the hole diameter adjusting plate 2 can rotate around the mounting shaft 10. All the aperture adjusting plates 2 are arranged in two layers, the central angle between two adjacent aperture adjusting plates on the same layer forms an included angle of 60 degrees, and the central angle between two adjacent aperture adjusting plates on different layers forms an included angle of 30 degrees. The second molding surface of each aperture-adjusting plate encloses an orifice. The gear teeth 12 engage with the internal teeth 19. The external teeth 18 of the transmission gear are meshed with an angle turning gear 24, and the knob, the rotary dial 9 and the dial 5 for displaying the turning angle are coaxially connected. When the knob rotates, the rotary turntable 9 is driven to rotate, the annular transmission gear 8 drives the aperture adjusting plate 2 to rotate, the transmission ratio between the rotary turntable 9 and the transmission gear 12 can obtain a rotating angle and is displayed by the scales 17 on the rotary display plate, and the aperture of the throttling hole can be converted.
The aperture-adjusting plates of the first layer and the aperture-adjusting plates of the second layer have larger and larger gaps between the layers along with the rotation process, and upstream fluid leaks through intermittent places, so that the resistance coefficient changes. In order to prevent the phenomenon, the reducing throttle plate of the embodiment of the invention also comprises a plurality of leakage-proof sealing plates; each of the leak-proof sealing plates includes:
the first leakage-proof sealing plate 6 is connected with the second leakage-proof sealing plate 7 through a torsion spring 11 and is provided with a first sealing forming surface 20 and a second sealing forming surface 21;
a first seal forming surface 20 for sealing contact with the first forming surface 16 of the aperture plate of the second layer;
a second seal molding surface 21 for sealing contact with the upper side of the aperture regulating plate of the first layer;
the second leak-proof sealing plate 7 is provided with a third sealing forming surface 23 and a fourth sealing forming surface 22;
a third seal forming surface 23 for sealing contact with the mounting plate 1; and
a fourth seal molding surface 22 for sealing contact with the third molding surface 13 of the aperture regulating plate of the first layer;
the first seal forming surface conforms to the shape of the first forming surface and the fourth seal forming surface conforms to the shape of the fourth forming surface.
Further, the aperture-adjusting plate further includes a first molding surface 16, a third molding surface 13, and a fourth molding surface 15; the third molding surfaces of any two adjacent aperture-adjusting plates of the aperture-adjusting plate of the first layer and the aperture-adjusting plate of the second layer are in sealing contact;
specifically, under the action of the elastic force of the torsion spring 11, the sealing surfaces of the first leakage-proof sealing plate 6 and the first leakage-proof sealing plate 7 are in close contact with the variable-aperture forming surface and the mounting plate, so that the purpose of sealing the fluid is achieved.
The throttle orifice plate is installed on a pipeline system, and the position can be unfixed due to the throttle piece, and the hydraulic parameters required by the pipeline system can be reached by adjusting the knob of the rotary turntable on the throttle orifice plate. And obtaining a rotation angle through the rotated angle scale, and obtaining an accurate throttling hole radius through calculation.
CFD simulations were performed under the same hydraulic conditions for a variable aperture orifice plate and a single aperture orifice plate having orifice radii of 44m and 7.2mm, respectively, and the structures of the orifice plates used were shown in fig. 8 and 9.
Fig. 10-13 are CFD calculation flow field line diagrams. The flow field is substantially uniform under the same simulated aperture.
Table 1 shows the comparison of the calculated pressure drops, which are consistent.
TABLE 1 calculated pressure drop Table
| Orifice radius (mm) | Variable aperture orifice plate pressure drop (kPa) | Pressure drop (kPa) of a single orifice plate |
| 44 | 0.503 | 0.514 |
| 7.2 | 54.2 | 53.7 |
In summary, compared with the existing orifice plate with a fixed diameter, the reducing orifice plate of the embodiment of the invention has basically the same flow field under the same simulated aperture, so that the reducing orifice plate of the embodiment of the invention can be used in the process of accurately designing the orifice plate, and the orifice plate with the fixed diameter is not required to be disassembled and remounted for multiple times to carry out simulation tests.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A reducing orifice plate, comprising:
the mounting plate is used for rotatably arranging a plurality of aperture adjusting plates;
the second molding surfaces of all the aperture adjusting plates form a circular throttling hole together; and
the transmission mechanism is in transmission connection with each aperture adjusting plate and is used for synchronously changing the rotation angle of each aperture adjusting plate so as to change the diameter of the throttling hole;
the aperture adjustment plate further comprises a first molding surface, a third molding surface and a fourth molding surface; the third molding surfaces of any two adjacent aperture-adjusting plates of the aperture-adjusting plate of the first layer and the aperture-adjusting plate of the second layer are in sealing contact;
the reducing orifice plate also comprises a plurality of leakage-proof sealing plates; each of the leak-proof sealing plates includes:
the first leakage-proof sealing plate is connected with the second leakage-proof sealing plate through a torsional spring and is provided with a first sealing forming surface and a second sealing forming surface;
a first seal land for sealing contact with the first forming surface of the aperture plate of the second layer;
a second seal molding surface for sealing contact with the upper side of the aperture regulating plate of the first layer;
the second leakage-proof sealing plate is provided with a third sealing forming surface and a fourth sealing forming surface;
a third seal molding surface for sealing contact with the mounting plate; and
a fourth seal land for sealing contact with the third land of the aperture plate of the first layer;
the first seal forming surface is adapted to the shape of the first forming surface, and the fourth seal forming surface is adapted to the shape of the fourth forming surface.
2. The reducing orifice plate of claim 1, further comprising an angle adjustment device; the angle adjusting device includes:
the rotary turntable is arranged on the mounting plate and is in transmission connection with the transmission mechanism, and when the rotary turntable rotates, the transmission mechanism drives each aperture adjusting plate to synchronously rotate to change the rotating angle of each aperture adjusting plate so as to change the diameter of the throttling hole.
3. The variable diameter orifice plate of claim 2, wherein the angle adjustment means further comprises:
the pointer is arranged on the rotary turntable; and
the dial is used for being arranged on the mounting plate on the outer side of the rotary turntable, and a plurality of angle scales are arranged at the corresponding positions of the dial and a pointer of the rotary turntable so as to indicate the rotating angle of the rotary turntable through the pointer when the rotary turntable rotates.
4. The variable diameter orifice plate of claim 1, wherein the second molding surface is in the shape of a spiral, the spiral conforming to the helical polar equation:
ρ＝ρ 0 +aθ
where ρ is the pole diameter, θ is the pole angle, a is a constant greater than zero, ρ is 0 The starting diameter.
5. The reducing orifice plate of any one of claims 2 to 3, wherein a knob is provided on the rotary dial.
6. The variable diameter orifice plate of any one of claims 2 to 3, wherein the drive mechanism comprises a circular drive member;
each aperture adjusting plate is arranged in the annular transmission part and is rotationally connected with the mounting plate; an inner transmission part is arranged along the circumferential direction of the inner wall of the annular transmission part; each aperture adjusting plate is provided with an arc-shaped transmission part;
the arc-shaped transmission part of each aperture adjusting plate is in transmission connection with the inner transmission part, so that when the circular transmission part rotates, the inner transmission part drives each aperture adjusting plate to synchronously change the rotation angle so as to change the diameter of the throttling hole;
an outer transmission part is arranged on the outer side of the circular transmission part, and the rotary turntable is in transmission connection with the outer transmission part.
7. The reducing orifice plate of claim 6, wherein the annular drive member is an annular drive gear; the inner transmission part is a plurality of inner teeth arranged on the inner side circumference of the annular transmission gear; the outer transmission part is a plurality of outer teeth arranged on the outer circumference of the circular transmission gear; the outer side of the rotating turntable is circumferentially provided with rotating teeth, and the rotating teeth are meshed with the outer teeth; arc drive division is for locating the driving gear that is arc distribution on the aperture regulating plate, driving gear and internal toothing.
8. The variable diameter orifice plate of claim 7, wherein the plurality of orifice adjusting plates are distributed in two layers on the mounting plate;
the first layer of aperture adjusting plates are uniformly distributed on the mounting plate in a circular shape, each aperture adjusting plate of the first layer of aperture adjusting plates is rotatably connected with the mounting plate, and each aperture adjusting plate of the first layer of aperture adjusting plates is in transmission connection with the inner side of the circular transmission piece;
the aperture adjusting plates of the second layer are uniformly distributed on the aperture adjusting plates of the first layer in a circular shape, each aperture adjusting plate of the aperture adjusting plates of the second layer is rotatably connected with the mounting plate, and each aperture adjusting plate of the aperture adjusting plates of the second layer is in transmission connection with the inner side of the circular transmission piece;
the number of the aperture adjusting plates of the first layer is the same as that of the aperture adjusting plates of the second layer;
the central angles between any two adjacent aperture-adjusting plates of the first layer are the same;
the central angles between any two adjacent aperture-adjusting plates of the second layer are the same.
9. The variable diameter orifice plate of claim 8, wherein the number of aperture plates of the first layer is 6, the number of aperture plates of the second layer is 6, and a central angle between any two adjacent aperture plates of the first layer is 60 °; the central angle between any two adjacent aperture-adjusting plates of the second layer is 60 degrees; the central angle between any two adjacent aperture-regulating plates of the aperture-regulating plate of the first layer and the aperture-regulating plate of the second layer was 30 °.
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