CN117332721B - Large-air-volume control valve, air valve hole plate and air valve hole plate optimal design method - Google Patents
Large-air-volume control valve, air valve hole plate and air valve hole plate optimal design method Download PDFInfo
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Abstract
The invention discloses a large air volume control valve, an air valve hole plate and an air valve hole plate optimal design method, and belongs to the technical field of air volume control valves. According to the method for optimally designing the air valve orifice plate, the air valve calibration is carried out on the air valves corresponding to the air valves of the air valve orifice plates on the standard test bed, the downstream deviation of the local resistance piece is detected through the three-way test bed and the elbow test bed, the air valve orifice plate structures of the air valve orifice control valves suitable for different air volumes are gradually screened out on the basis of factors such as the appearance structure, the orifice shape, the orifice plate aspect ratio, the equivalent diameter ratio, the air volume control valve pressure difference and the like of the air valve orifice plates, the outer structure of the finally obtained air valve orifice plate is of an oblate structure, two types of holes are respectively of oblate shape and two parallel circles, and on the basis, the proper orifice plate aspect ratio and orifice plate equivalent diameter ratio are screened out, so that the control requirements of different large air volumes are met, and the whole air valve is small in occupied space, low in cost and wide in application range.
Description
Technical Field
The invention relates to the technical field of air quantity control valves, in particular to a large air quantity control valve, an air valve hole plate and an air valve hole plate optimal design method.
Background
The air quantity control valve controls the air quantity under the rated air quantity. However, in practical applications, when the rated air quantity of the valve body is exceeded, the current solution is to adopt a plurality of valves connected in parallel to solve the problems. If the valves with the specification of 250mm and the air volume of 250-1700m 3/h are overlapped in parallel, the air volume of 1000-6800m 3/h can be controlled, and the valves with the specification of 400mm and the air volume of 250-3700m 3/h are overlapped in parallel, so that the air volume of 1000-14800m 3/h can be controlled. However, the processing method greatly increases the cost because each valve in the parallel valves needs an independent actuator and a wind measuring device and a sensor, that is, four valves need four sets of actuators and wind measuring devices and sensors in parallel, and the cost is greatly increased.
Therefore, the above-mentioned existing air volume control valve has the problem that it cannot meet the requirement of larger air volume in practical application, and further improvement is needed. How to create a new large air volume control valve, an air valve hole plate and an optimal design method of the air valve hole plate, so that the novel large air volume control valve can meet the control requirements of different large air volumes, can better realize large air volume control, has small occupied space, low cost and wide application range, and becomes a target of great improvement in the current industry.
Disclosure of Invention
The invention aims to solve the technical problem of providing the air valve orifice plate of the large air volume control valve, so that the air valve orifice plate can meet the control requirements of different large air volumes, the large air volume control is realized more preferably, the occupied space is small, the cost is low, and the application range is wide, thereby overcoming the defects of the existing air volume control valve.
In order to solve the technical problems, the invention provides an air valve orifice plate of a large air volume control valve, wherein the air valve orifice plate is an oblate orifice plate, and two parallel circular holes are arranged in the oblate orifice plate.
Further improvement, the oblate orifice plate is used in an air valve housing for controlling 5500-10000m 3/h rated air quantity, and when the aspect ratio of the oblate orifice plate is 2, the equivalent diameter ratio of the oblate orifice plate is 0.72-0.866;
The oblate orifice plate is used in an air valve housing for controlling 15000m 3/h rated air quantity, and when the aspect ratio of the oblate orifice plate is 2, the equivalent diameter ratio of the oblate orifice plate is 0.72; the aspect ratio of the oblate is 0.837 when the aspect ratio is 1.75-1.46.
As a further improvement of the present invention, the present invention also provides an air valve orifice plate of a large air volume control valve, wherein the air valve orifice plate adopts an oblate orifice plate, and an oblate orifice is arranged inside the oblate orifice plate.
Further improvement, the oblate orifice plate is used in an air valve housing for controlling 5500-10000m 3/h rated air quantity, and when the aspect ratio of the oblate orifice plate is 2, the equivalent diameter ratio of the oblate orifice plate is 0.72-0.837;
The oblate orifice plate is used in an air valve housing for controlling 15000m 3/h rated air quantity, and when the aspect ratio of the oblate orifice plate is 2, the equivalent diameter ratio of the oblate orifice plate is 0.72.
As a further improvement of the present invention, the present invention also provides a large air volume control valve, which includes an air valve housing and an air valve orifice plate of the above large air volume control valve disposed therein, the air valve housing includes a straight pipe section, a measuring section, and a control section, the air valve orifice plate is disposed in the measuring section, and upstream and downstream static rings are disposed on the upstream and downstream sides of the air valve orifice plate, respectively, and a regulating valve is disposed in the control section.
Further improved, the distance from the upstream static ring and the downstream static ring to the air valve orifice plate is 0.25D, the length of the straight pipe section is less than or equal to 0.5D, and D is the hydraulic diameter of the cross section of the air valve housing.
As still another improvement of the present invention, the present invention also provides a method for optimizing design of a damper orifice plate of a large-air-volume control valve, characterized in that the method comprises the steps of:
S1, presetting a plurality of outline structures suitable for an orifice plate of a blast valve in a large-air-volume control valve according to the type of an existing blast pipe and the occupied space of an air valve, wherein initial design parameters in the plurality of outline structures comprise the outline structures of the orifice plate and the internal orifice structures of the orifice plate;
s2, determining the initial aspect ratio and the initial equivalent diameter ratio of pore plates with various appearance structures, and respectively installing the determined various air valve hole plates in an air valve shell to form air volume control valves with various specifications;
S3, calibrating the air valves of the air control valves on a standard test bed respectively to obtain air pressure difference curves corresponding to all pore plates, then installing the air control valves of the air control valves on the elbow test bed and the tee test bed respectively to obtain deviation results of air measurement values and standard air obtained by the air control valves on the downstream of the elbow local resistance piece and the downstream of the tee local resistance piece respectively, and screening out the air control valves with deviation results smaller than preset values, wherein the air valve pore plates corresponding to the air control valves are the air valve pore plates of the large air control valves suitable for corresponding air volumes.
Further improved, the method further comprises the step of considering the product pressure difference factor of the air quantity control valve in the steps S4 and S4, specifically:
S4.1, according to the data of air valve calibration of an air volume control valve on a standard test bed, obtaining a product pressure difference and air volume relation curve, observing the pressure difference under the rated air volume of a product under the condition of the initial equivalent diameter ratio, modifying the equivalent diameter ratio of an air valve orifice plate, and obtaining the equivalent diameter ratio of the air valve orifice plate with the pressure difference of approximately 50Pa under the rated air volume of the product through the air valve calibration of the standard test bed;
And S4.2, respectively mounting air volume control valves formed by air valve pore plates with the pressure difference of 50Pa under the rated air volume of the product obtained in the step S4.1 on an elbow test bed and a tee joint test bed to respectively obtain deviation results of air volume measured values and standard air volumes, which are obtained by the air volume control valves at the downstream of an elbow local resistance part and the downstream of a tee joint local resistance part, and screening out the air volume control valves with the deviation results smaller than a preset value, thereby obtaining the corresponding air valve pore plates in the air volume control valves with the pressure difference of 50Pa under the rated air volume of the product corresponding to the air volume.
Further improvement, further comprising step S4.3, specifically: and if the deviation result of the air volume measured value and the standard air volume obtained in the step S4.2 is larger than a preset value, selecting an air volume control valve corresponding to an equivalent diameter ratio of which the pressure difference is larger than 50Pa under the rated air volume of the product, and repeating the step S4.2 until the air volume control valve with the deviation result smaller than the preset value is screened out, thus obtaining the maximum equivalent diameter ratio of an air valve pore plate corresponding to the air volume control valve under the corresponding air volume.
Further improved, the method further comprises a step S5, specifically:
s5, if the deviation result of the air volume measured value obtained in S4.2 and the standard air volume is larger than a preset value, modifying the aspect ratio of the air valve orifice plate corresponding to the air volume control valve, setting the equivalent diameter ratio of the air valve orifice plate to be the equivalent diameter ratio of 50Pa of the pressure difference under the rated air volume of the product corresponding to the air volume control valve, repeating the step S4.2, screening the air volume control valve with the deviation result smaller than the preset value, and obtaining the optimal aspect ratio of the air valve orifice plate under the air volume corresponding to the air volume; and if the deviation result is still larger than the preset value, continuously modifying the aspect ratio of the air valve orifice plate, and repeating the steps until the air volume control valve with the deviation result smaller than the preset value is screened out, so that the aspect ratio of the air valve orifice plate under the corresponding air volume is obtained.
With such a design, the invention has at least the following advantages:
According to the method for optimally designing the air valve hole plate of the large air volume control valve, the air valve is calibrated on a standard test bed through the designed air valve hole plate structures, the downstream deviation of a local resistance piece is detected through a tee joint test bed and an elbow test bed, and the air valve hole plate structures suitable for the air volume control valves with different air volumes are gradually screened out on the basis of considering factors such as the appearance structure, the orifice shape, the orifice width-to-height ratio, the equivalent diameter ratio, the pressure drop of the air volume control valve and the like of the air valve hole plate, and finally the outer structure of the air valve hole plate is of an oblate structure, wherein two hole type orifices are respectively of oblate shape and two parallel circles. And on the basis of the appearance structure, the structure size, the aperture plate aspect ratio and the aperture plate equivalent diameter ratio of different aperture plates suitable for each air quantity are screened out, so that the control requirements of different large air quantities are respectively met, the control of the large air quantity is better realized, the occupied space is small, the appearance is attractive, the cost is low, and the application range is wide.
Drawings
The foregoing is merely an overview of the present invention, and the present invention is further described in detail below with reference to the accompanying drawings and detailed description.
FIG. 1 is a schematic structural view of various initial outline structures in the method for optimizing the design of a valve orifice plate of a large-air-volume control valve.
Fig. 2 is a structural dimension diagram of five air valves to be tested and an air valve orifice plate in the air valve orifice plate optimal design method of the large air volume control valve in the invention under the rated air volume condition of 5500m 3/h.
Fig. 3 is a schematic structural diagram of a standard test stand in the method for optimizing design of a damper orifice plate of the large-air-quantity control valve of the present invention.
Fig. 4 is a schematic structural diagram of an elbow test stand in the method for optimally designing a valve hole plate of the large-air-volume control valve.
Fig. 5 is a schematic structural diagram of a three-way test stand in the method for optimally designing a valve hole plate of the large air volume control valve.
Fig. 6 is an air volume pressure difference curve obtained by calibrating air volume control valves of five air valve hole plate structures through an air valve in the air valve hole plate optimal design method of the large air volume control valve.
Fig. 7 is a deviation result of the air volume measured values and the standard air volume obtained by the air volume control valves of the five air valve hole plate structures in the air valve hole plate optimization design method of the large air volume control valve of the invention at the downstream of the elbow local resistance part and the downstream of the three-way local resistance part.
FIG. 8 is a graph of the air flow pressure difference obtained by the air flow valve orifice plate structure size for 7500m 3/h rated air flow and the corresponding air flow control valve in the air flow orifice plate optimal design method of the large air flow control valve.
FIG. 9 is a graph of the air volume differential pressure obtained by the air valve orifice plate structure size for 10000m 3/h rated air volume and the corresponding air volume control valve in the air valve orifice plate optimal design method of the large air volume control valve of the invention.
FIG. 10 is a graph of the size of the structure of the air valve orifice plate for 15000m 3/h rated air volume and the air volume pressure difference obtained by the corresponding air volume control valve in the method for optimally designing the air valve orifice plate of the large air volume control valve.
FIG. 11 shows the deviation result of the measured air volume and the standard air volume obtained by the air volume control valve for 7500m 3/h rated air volume at the downstream of the elbow local resistance part and the downstream of the tee local resistance part in the air valve hole plate optimal design method of the large air volume control valve.
FIG. 12 is a deviation result of the measured air volume and the standard air volume obtained by the air volume control valve for 10000m3/h rated air volume at the downstream of the elbow local resistance piece and the downstream of the tee local resistance piece in the air valve hole plate optimization design method of the large air volume control valve.
FIG. 13 shows the deviation of the measured air volume from the standard air volume obtained by the air volume control valve for 15000m 3/h rated air volume downstream of the elbow local resistance and downstream of the tee local resistance in the air valve hole plate optimal design method of the large air volume control valve.
FIG. 14 is a graph showing the relationship between the pressure difference and the air volume of two air volume control valves for 5500m 3/h rated air volume in the method for optimally designing the air valve orifice plate of the large air volume control valve of the present invention.
FIG. 15 is a graph showing the relationship between the product pressure difference and the air volume of two air volume control valves for 7500m 3/h rated air volume in the method for optimally designing the air valve hole plate of the large air volume control valve.
FIG. 16 is a graph showing the relationship between the product pressure difference and the air volume of two air volume control valves for 10000m 3/h rated air volume in the method for optimally designing the air valve hole plate of the large air volume control valve.
FIG. 17 is a graph showing the relationship between the product pressure difference and the air volume of two air volume control valves for 15000m 3/h rated air volume in the method for optimally designing the air valve hole plate of the large air volume control valve.
FIG. 18 is a graph of structural dimensions and product pressure difference versus air volume for air valve orifice plates of different equivalent diameter ratios at 5500m 3/h rated air volume in the method for optimally designing air valve orifice plates of a large air volume control valve of the present invention.
FIG. 19 is a graph of structural dimensions and product pressure difference versus air volume for air valve orifice plates of different equivalent diameter ratios at 7500m 3/h rated air volume in the method for optimally designing air valve orifice plates of large air volume control valve of the present invention.
FIG. 20 is a graph of structural dimensions and product pressure difference versus air volume of a damper orifice plate with different equivalent diameter ratios at 10000m 3/h rated air volume in the method for optimally designing a damper orifice plate of a large air volume control valve of the present invention.
FIG. 21 is a graph 1 of structural dimensions and product pressure difference versus air volume of an air valve orifice plate with different equivalent diameter ratios under 15000m 3/h rated air volume in an air valve orifice plate optimal design method of a large air volume control valve of the invention.
FIG. 22 is a graph 2 of structural dimensions and product pressure difference versus air volume of air valve orifice plates with different equivalent diameter ratios under 15000m 3/h rated air volume in the method for optimally designing the air valve orifice plates of the large air volume control valve of the invention.
FIG. 23 is a graph showing the deviation of standard air volume from the measured air volume of the air valve product at 5500m 3/h rated air volume and the air valve product at the downstream of the elbow and the three-way local resistance piece.
FIG. 24 is a calibration curve of a damper product with different equivalent diameter ratios under 7500m 3/h rated air volume and a deviation result of an air volume measured value and a standard air volume obtained by the damper product at the downstream of a bend and a three-way local resistance piece in the optimized design method of the air valve hole plate of the large air volume control valve.
FIG. 25 is a calibration curve of a damper product with different equivalent diameter ratios at 10000m 3/h rated air volume and a deviation result of an air volume measured value obtained by the damper product at the downstream of a elbow and a three-way local resistance piece from standard air volume in the optimized design method of an air valve hole plate of the large air volume control valve.
FIG. 26 is a calibration curve of a damper product with different equivalent diameter ratios at 15000m 3/h rated air volume and a deviation result of an air volume measured value obtained by the damper product at the downstream of a bend and a three-way local resistance piece from standard air volume in the optimized design method of an air valve hole plate of the large air volume control valve.
FIG. 27 is a calibration curve of a damper product with an equivalent diameter ratio of 0.837 at a rated air volume of 15000m 3/h and a deviation result of an air volume measured value obtained by the damper product at the downstream of an elbow and a three-way local resistance piece from a standard air volume in the optimized design method of an air valve hole plate of the large air volume control valve.
FIG. 28 is a calibration curve of a damper product with an equivalent diameter ratio of 0.806 at a rated air volume of 15000m 3/h and a deviation result of an air volume measured value obtained by the damper product at the downstream of an elbow and a three-way local resistance piece from a standard air volume in the optimized design method of an air valve hole plate of the large air volume control valve.
FIG. 29 is a graph showing the relationship between the structural dimensions and the pressure difference of the products and the air volume of a damper product with an equivalent diameter ratio of 0.837 and an aspect ratio of 1.75 under the rated air volume of 15000m 3/h in the method for optimally designing the damper orifice plate of the large air volume control valve of the present invention.
FIG. 30 is a calibration curve of a damper product with an equivalent diameter ratio of 0.837 and an aspect ratio of 1.75 and deviation results of measured air volume from standard air volume obtained downstream of a bend and a three-way local resistance piece under 15000m 3/h rated air volume in the damper orifice plate optimization design method of the large air volume control valve of the present invention.
FIG. 31 is a structural dimension of a damper product with an equivalent diameter ratio of 0.819 and an aspect ratio of 1.75, a product pressure difference versus air volume curve, a calibration curve, and deviation results of air volume measurement values and standard air volumes obtained downstream of a local resistance of an elbow and downstream of a local resistance of a tee joint in the damper orifice plate optimal design method of the large air volume control valve of the present invention under 15000m 3/h rated air volume.
FIG. 32 is a graph showing the structural dimensions of a damper product having an equivalent diameter ratio of 0.806 and an aspect ratio of 1.75, a product pressure difference versus air volume curve, a calibration curve, and the deviation of air volume measurements from standard air volume obtained downstream of a local resistance of an elbow and downstream of a local resistance of a tee, at 15000m 3/h rated air volume, in the method for optimally designing a damper orifice plate of a large-volume air control valve of the present invention.
FIG. 33 is a graph showing the structural dimensions of an A-c-1 damper product with an equivalent diameter ratio of 0.837 and an aspect ratio of 1.46, a product pressure difference versus air volume curve, a calibration curve, and the deviation of the measured air volume from the standard air volume obtained downstream of the elbow and the three-way local resistance piece, under 15000m 3/h rated air volume, in the method for optimally designing the air valve orifice plate of the large air volume control valve of the present invention.
FIG. 34 is a graph showing the structural dimensions of an A-c-2 damper product with an equivalent diameter ratio of 0.837 and an aspect ratio of 1.46, a product pressure difference versus air volume curve, a calibration curve, and the deviation of the measured air volume from the standard air volume obtained downstream of the elbow and the three-way local resistance piece, under 15000m 3/h rated air volume, in the method for optimally designing the air valve orifice plate of the large air volume control valve of the present invention.
FIG. 35 is a graph showing the structural dimensions of the A-c-1 damper product with an equivalent diameter ratio of 0.806 and an aspect ratio of 1.46, a product pressure difference versus air volume curve, a calibration curve, and the deviation of the measured air volume from the standard air volume obtained downstream of the elbow and the three-way local resistance piece, under 15000m 3/h rated air volume, in the method for optimally designing the air valve orifice plate of the large air volume control valve of the present invention.
FIG. 36 shows four structural dimensions of a damper orifice plate suitable for 5500m 3/h rated air volume, screened by the damper orifice plate optimization design method of the large air volume control valve of the invention.
FIG. 37 shows four structural dimensions of a damper orifice plate screened by the damper orifice plate optimization design method of the large-air-volume control valve, which are suitable for 7500m 3/h rated air volume.
FIG. 38 shows four structural dimensions of a damper orifice plate suitable for 10000m 3/h rated air volume, screened by the damper orifice plate optimization design method of the large air volume control valve of the invention.
FIG. 39 shows four structural dimensions of a damper orifice plate suitable for 15000m 3/h rated air volume, screened by the damper orifice plate optimization design method of the large air volume control valve of the invention.
Detailed Description
The embodiment optimizes the air valve hole plate of the 5500-15000 m 3/h large air volume control valve with the attached drawing in the specification, and the considerations including the shape of the hole plate, the aspect ratio of the hole plate, the equivalent diameter ratio, the pressure drop of the air volume control valve and the like are used for elaborating the technical content of the application and are not to be construed as any limitation of the application. Specific examples are as follows.
Contour structure determination
1. Air valve hole plate structure preset device
The shape of the large air volume control valve is considered according to the type of the current air pipe, and the large air volume control valve can be made into a rectangular shape, a round shape or an oblate shape. Because the space occupation height of the round valve body for the large air volume control valve is too large, the round shape is firstly eliminated as the shape of the air valve hole plate of the large air volume air valve, and the rectangular shape and the oblate shape are selected as the shape of the air valve hole plate of the large air volume air valve.
Then, the internal orifice structure of the air valve orifice plate is designed, and the shape can be round, rectangular or oblate. In this way, various outline structures of the valve orifice plate, which are possibly suitable for the large air volume control valve, can be preset, as shown in fig. 1.
And then, setting the equivalent diameter ratio of the air valve orifice plate with the structure to be 0.72 according to the research and development experience of the air valve orifice plate in the conventional air volume control valve, so that the air volume measurement precision and the pressure drop requirement are both met. And then the structural size of the air valve hole plate can be determined according to the cross section size of the air valve. According to the processing technology requirement of the pore plate, the minimum value of the distance between two circular orifices in the pore plate is set to be 6mm.
It should be noted that the equivalent diameter ratio in the present application is the square root of the ratio of the cross-sectional area of the orifice in the air valve orifice plate to the cross-sectional area of the air valve orifice plate.
The cross-sectional dimensions of the air volume control valve are generally designed according to an aspect ratio of about 2, so that on one hand, the size of the air duct is catered for, and on the other hand, the resistance is small for integrating the flowing air flow more uniformly, and on the other hand, the cost is reduced.
And then, combining the estimated standard air quantity, controlling the section air speed of the air valve to be about 8m/s, and designing the width and height dimensions of the air valve.
2. Structure presetting of air quantity control valve
Referring to fig. 2, the housing 1 of the air volume control valve includes a straight pipe section 11, a measuring section 12 and a control section 13, the air valve orifice 10 is disposed in the measuring section 12, and upstream and downstream static pressure rings 14 and 15 are respectively disposed on the upstream and downstream of the air valve orifice 10, for measuring the pressure difference between the front and rear sides of the orifice. The control section 13 is provided with a regulating valve for regulating the air quantity.
The distance between the upstream static ring 14 and the downstream static ring 15 and the orifice plate 10 is set to be 0.25D of the orifice plate cross section, and the static rings can accurately measure the orifice plate pressure difference at the two positions and the required distance is short. And the distance from the upstream static ring 14 to the upstream cross section of the damper is tentatively set to 0.5D, that is, the length of the straight pipe section 11 is set to 0.5D. Wherein D is the hydraulic diameter of the section of the air valve. The length of the temporary control section 13 is also 320mm. So that the length of the entire damper is determined. Fig. 2 shows the structural dimensions of five air valves to be tested and the air valve orifice plate under the condition of rated air quantity of 5500m 3/h.
3. Numbering of air quantity control valve
For convenience of description and understanding, in this embodiment, different appearances, structures and dimensions of the air volume control valve are numbered, for example, the outer shape is designed to be an oblate shape and a rectangular shape, and the oblate shape and the rectangular shape are respectively denoted by a and B; the aspect ratio is designed to be 2, 1.75 and 1.46, and the aspect ratios are respectively represented by a, b and c; the orifice structure has three kinds of oblate, two circles and rectangle, which are respectively denoted by 1,2 and 3. Thus, when the orifice plate is oblate, the orifice is oblate, and the aspect ratio of the orifice plate is 2, the orifice plate and the corresponding air quantity control valve are numbered A-a-1; when the orifice plate appearance is rectangular, the orifice is double round hole shape, and the orifice plate length-width ratio is 2, the orifice plate and the corresponding air quantity control valve are numbered as B-a-2, as shown in figure 2.
(II) Experimental protocol formulation
1. Air valve calibration
The air valve calibration is to determine the standard flow and pressure difference passing through the air volume control valve by using a standard test bed. The standard flow is measured and calculated by a nozzle box in a standard test bed, the differential pressure is measured and calculated by static pressure rings at the upstream and downstream of the orifice plate, and the obtained standard air quantity and differential pressure are subjected to data fitting to obtain an air quantity differential pressure curve.
The standard test bed in this embodiment is an existing standard test bed, and a specific test layout is shown in fig. 3. The standard test bed is powered by a fan, the front pressure value and the rear pressure value of a measuring nozzle are calculated by a nozzle standard formula to obtain the flow passing through a pipeline, and then the standard flow passing through the air valve is corrected by the density difference between the nozzle box and the air valve. The system arrangement can also be applied to rectangular air valves and oblate air valves by increasing the diameter.
2. Downstream deviation test for local resistance component of air valve
The most common local resistance components are: elbow, tee and reducing, wherein the impact on the damper is greater is tee and elbow. In the embodiment, the air quantity control valve to be tested is arranged at the downstream of the elbow and the tee joint, and the performance of the air valve at the downstream of the local resistance component is directly tested without considering the addition of a straight pipe section. The elbow test bed and the tee joint test bed are of the existing structure, and the layout of the specific test bed is shown in fig. 4 and 5.
After the test, the measured front and rear pressure difference values of the air valve hole plate are brought into an air volume pressure difference curve obtained through fitting in an air valve calibration step, so that an air volume value is obtained, and then the air volume value is subjected to deviation comparison with the standard air volume calculated by a nozzle box in a test bed. And screening out air quantity control valves with deviation results smaller than preset values, wherein an air valve pore plate corresponding to the air quantity control valves is an air valve pore plate of a large air quantity control valve suitable for corresponding air quantity.
The preset value of this embodiment is 5%.
In this embodiment, the air volume control valve with smaller control air volume is tested first, and after the air valve orifice plate of the air volume control valve suitable for the air volume is screened out, the amplification experiment is performed on the air valve orifice plate structure, the screening of the air valve orifice plate of the air volume control valve with larger air volume is performed, and the subsequent experiment is not performed due to larger deviation. In the subsequent experiments, the factors such as aperture plate aspect ratio, equivalent diameter ratio, air volume control valve pressure difference and the like are considered, and the specific experimental process is as follows.
(III) Experimental procedure
1. First stage
And (3) respectively calibrating the air flow control valves of the five preset air flow valve hole plate structures on a standard test bed, wherein an air flow pressure difference curve obtained by calibration is shown in figure 6.
And then the air quantity control valves of the five air valve hole plate structures are respectively arranged on the elbow test bed and the tee joint test bed, and deviation results of air quantity measured values and standard air quantity obtained by the air quantity control valves at the downstream of the elbow local resistance piece and the downstream of the tee joint local resistance piece are respectively obtained, wherein the structure is shown in figure 7.
From the experimental results of fig. 6 and 7, it is shown that the deviation of A-a-1 under the condition of large air quantity is within 3%, the deviation of A-a-2 is within 2%, and the deviations of B-a-1, B-a-2 and B-a-3 are all greater than 3%. Therefore, the air valve hole plates with the structures of A-a-1 and A-a-2 and the equivalent diameter ratio of 0.72 are selected as the air valve hole plates of the air volume control valve for controlling the air volume of 5500m 3/h.
And the air valve hole plates with structures of A-a-1 and A-a-2 and equivalent diameter ratio of 0.72 are continuously amplified and researched.
2. Second stage
After the first stage is completed, the exploration direction is determined, the test of the enlarged specification is continued according to the experimental method, and the structure of the enlarged air valve hole and the fitting calibration curve are shown in fig. 8 to 10. FIG. 8 shows the plate structure size of the air valve hole of the air control valve for 7500m 3/h rated air volume and the air volume pressure difference curve obtained by the corresponding air control valve. Fig. 9 shows the structure size of the air valve hole plate of the air volume control valve for 10000m 3/h rated air volume and the air volume pressure difference curve obtained by the corresponding air volume control valve. FIG. 10 shows the plate structure size of the air valve hole of the air control valve for 15000m 3/h rated air volume and the air volume pressure difference curve obtained by the corresponding air control valve.
And then the air quantity control valves of the two air valve hole plate structures are respectively arranged on an elbow test bed and a tee joint test bed, and deviation results of air quantity measured values and standard air quantity obtained by the air quantity control valves at the downstream of the elbow local resistance part and the downstream of the tee joint local resistance part are respectively obtained, wherein the structures are shown in figures 11-13. FIG. 11 shows the deviation of the measured air volume from the standard air volume obtained by the air volume control valve for 7500m 3/h rated air volume downstream of the elbow local resistance and downstream of the three-way local resistance. Fig. 12 shows the deviation results of the measured air volume from the standard air volume obtained by the air volume control valve for 10000m 3/h rated air volume downstream of the elbow local resistance and downstream of the three-way local resistance. FIG. 13 shows the deviation of the measured air volume from the standard air volume obtained by the air volume control valve for 15000m 3/h rated air volume downstream of the elbow local resistance and downstream of the three-way local resistance.
The experimental results of figures 11-13 show that after the size of the air valve structure is enlarged, most of the air valve structure has better performance at the downstream of the tee joint and the elbow, and basically meets the requirement of 3-5% of deviation. Of these, the 15000m 3/h specification performed slightly worse downstream of the tee.
3. Third stage
The air valve hole plates with the two appearance structures can be obtained through the air valve calibration experiment, and the pressure drop value of the air control valve, namely the product pressure difference, is obtained under the corresponding rated air volume specification, for example, the air valve calibration experiment data are used for making a product pressure difference and air volume relation curve, as shown in figures 14-17. Fig. 14 shows the product pressure difference versus air volume curves for two air volume control valves for a nominal air volume of 5500m 3/h. FIG. 15 shows product pressure differential versus air volume curves for two air volume control valves for 7500m 3/h rated air volume. Fig. 16 shows the product pressure difference versus air volume curves for two air volume control valves for 10000m 3/h rated air volume. FIG. 17 shows product pressure differential versus air volume curves for two air volume control valves for a rated air volume of 15000m 3/h.
It can be seen from FIGS. 14-17 that the measured pressure drops are all at a higher level, e.g., greater than 120Pa, based on the equivalent diameter ratio. In order to be better applied to the market, a maximum and minimum pressure drop range is hoped to be obtained by modifying the equivalent diameter ratio of the air valve orifice plate in the experiment, so that the application range of an air valve product is further enlarged on the basis that the air volume measurement precision is ensured, and the effects of energy conservation and emission reduction are met.
In this embodiment, the pressure drop is first controlled to be about 50Pa, so that the open area of the orifice plate of the damper needs to be increased. In this example, the equivalent diameter ratios were designed to be 0.775, 0.837 and 0.866, respectively, and the air valve pressure drop was examined, and if the pressure drop was reduced to about 50Pa, the downstream performance test of the elbow and the tee was performed. FIG. 18 shows structural dimensions of air valve orifice plates of different equivalent diameter ratios at 5500m 3/h rated air volume and product pressure differential versus air volume curves. FIG. 19 shows structural dimensions of air valve orifice plates of different equivalent diameter ratios at 7500m 3/h rated air volume and product pressure differential versus air volume curves. FIG. 20 shows structural dimensions of air valve orifice plates with different equivalent diameter ratios at 10000m 3/h rated air volume and product pressure difference versus air volume curves. FIG. 21 shows the structural dimensions of the orifice plate of the damper with different equivalent diameter ratios at a rated air volume of 15000m 3/h and a product pressure difference versus air volume curve 1. FIG. 22 shows the structural dimensions of the orifice plate of the damper with different equivalent diameter ratios at a rated air volume of 15000m 3/h and a product pressure difference versus air volume curve 2.
From the results of FIGS. 18-22 described above, it can be seen that the valve pressure drop decreases with increasing equivalent diameter ratio for different equivalent diameter ratios. As is clear from FIG. 18, the equivalent diameter ratio of A-a-1 and the equivalent diameter ratio of A-a-2 were 0.837 and 0.866, respectively, each of which reached the target pressure drop value of 50Pa at the rated air volume of 5500m 3/h. As is clear from the above-mentioned FIG. 19, the equivalent diameter ratio of A-a-1 and the equivalent diameter ratio of A-a-2 were 0.837 and 0.837, respectively, for the target pressure drop value of 50Pa at the rated air volume of 7500m 3/h. As is clear from FIG. 20, the equivalent diameter ratio of A-a-1 and the equivalent diameter ratio of A-a-2 were 0.837 and 0.837, respectively, for the target pressure drop value of 50Pa at the rated air volume of 10000m 3/h. As can be seen from the above-mentioned FIGS. 21 and 22, the equivalent diameter ratio of A-a-1 and the equivalent diameter ratio of A-a-2 are 0.866 and 0.866, respectively, at a rated air volume of 15000m 3/h and near the target pressure drop value of 50 Pa.
4. Fourth stage
And selecting the air valve products of the air valve pore plates with the corresponding equivalent diameter ratios reaching or approaching the target pressure drop value, and carrying out an air valve calibration experiment and an elbow and tee downstream test experiment. The results of the specific test experiments are shown in FIGS. 23-26.
FIG. 23 shows the calibration curves of the damper products with different equivalent diameter ratios at 5500m 3/h rated air volume and the deviation results of the measured air volume values and the standard air volume obtained by the damper products at the downstream of the elbow local resistance part and the downstream of the tee local resistance part. FIG. 24 shows the calibration curves of the damper products with different equivalent diameter ratios at 7500m 3/h rated air volume and the deviation results of the measured air volume values and the standard air volume obtained by the damper products at the downstream of the elbow local resistance part and the downstream of the tee local resistance part. FIG. 25 shows the calibration curves of the damper products with different equivalent diameter ratios at 10000m 3/h rated air volume and the deviation results of the measured air volume and the standard air volume obtained by the damper products at the downstream of the elbow local resistance part and the downstream of the tee local resistance part. FIG. 26 shows the calibration curves of the damper products with different equivalent diameter ratios at a rated air volume of 15000m 3/h and the deviation results of the measured air volume values of the damper products obtained at the downstream of the elbow local resistance and the downstream of the tee local resistance from the standard air volume.
23-25, When the integral pressure drop of the air valve is controlled to be about 50Pa under the rated air quantity of 5500m 3/h to 10000m 3/h, the corresponding equivalent diameter ratio products are better represented at the downstream of the elbow and the tee joint, and the basic deviation is less than 5%. However, as shown in fig. 26, when the rated air volume is increased to 15000m 3/h, the overall pressure drop of the air valve under the rated air volume cannot be well represented when the overall pressure drop of the air valve is low, the equivalent diameter ratio at the moment is 0.866, the pressure drop of the air valve is about 60Pa, the overall deviation of specific elbow and tee joint downstream is too large, and the deviation is about 10%, which indicates that the air volume flowing through the air valve with the structure cannot be accurately measured.
In this embodiment, an attempt is made to find a suitable equivalent diameter ratio by increasing the pressure drop of the air valve, for example, the equivalent diameter ratio is selected to be 0.837 in this embodiment, the pressure drop of the air valve is about 80Pa, and the product is placed on an elbow and tee test bed for testing, and the performance is shown in fig. 27.
FIG. 27 shows the calibration curve of the valve product with an equivalent diameter ratio of 0.837 and the deviation of the measured air volume from the standard air volume obtained by the valve product downstream of the elbow local resistance and downstream of the three-way local resistance at a rated air volume of 15000m 3/h. The results show that the product can not accurately measure the air quantity at the downstream of the elbow and the tee joint.
In this example, the equivalent diameter ratio was reduced to 0.806, and the air valve pressure drop at rated air volume was about 90 Pa. The product was also placed on an elbow and tee test stand for testing, as shown in fig. 28.
FIG. 28 shows the calibration curve of the valve product with equivalent diameter ratio 0.806 and the deviation of the measured air volume from the standard air volume obtained by the valve product downstream of the elbow local resistance and downstream of the three-way local resistance at a rated air volume of 15000m 3/h. The results show that the product shows a reduced overall deviation at a ratio of equivalent diameters of 0.837 downstream of the elbow and tee, but still does not meet the requirement of less than 5%. The following experiment was continued.
5. Fifth stage
Consider reducing the aspect ratio of the air valve orifice plate, as indicated by b, to 1.75. The orifice plate structure at an equivalent diameter ratio of 0.837 was then selected for the experiment.
FIG. 29 shows the structural dimensions of a damper product with an equivalent diameter ratio of 0.837 and an aspect ratio of 1.75 and the product pressure differential versus air volume curve for a rated air volume of 15000m 3/h; FIG. 30 shows the calibration curve of a damper product having an equivalent diameter ratio of 0.837 and an aspect ratio of 1.75 at a rated air volume of 15000m 3/h and the deviation of the measured air volume from the standard air volume obtained downstream of the elbow local resistance and downstream of the tee local resistance.
From the test results shown in FIGS. 29 and 30, the A-b-2 structure product performed well downstream of the tee at an equivalent diameter ratio of 0.837, which was acceptable. The deviation of the test results for A-b-1 is still larger, so that the equivalent diameter ratio of the A-b-1 structural product is continuously reduced to 0.825, 0.819, 0.812 and 0.806, and the test results are shown in figures 31 to 32. FIG. 31 shows the structural dimensions of a valve product with an equivalent diameter ratio of 0.819 and an aspect ratio of 1.75, a product pressure differential versus air volume curve, a calibration curve, and the deviation of air volume measurements from standard air volume obtained downstream of the elbow local resistance and downstream of the tee local resistance at 15000m 3/h rated air volume. FIG. 32 shows the structural dimensions of a valve product having an equivalent diameter ratio of 0.806 and an aspect ratio of 1.75, a product pressure differential versus air volume curve, a calibration curve, and the deviation of air volume measurements from standard air volume obtained downstream of the elbow local resistance and downstream of the tee local resistance at 15000m 3/h rated air volume.
From the results of FIGS. 31 and 32, the orifice plate did not lift well for deviations at different equivalent diameter ratios of 0.819 and 0.806.
In the embodiment, the aspect ratio of the air valve orifice plate is changed to continuously explore a proper structure under the rated air quantity of 15000m 3/h. The same experimental test as described above was performed with an aspect ratio of the orifice plate of the damper, indicated by c, based on which the equivalent diameter ratio of the orifice plate was 0.837, with specific structure shown in fig. 33 and 34.
FIG. 33 shows the structural dimensions of the A-c-1 damper product with an equivalent diameter ratio of 0.837 and an aspect ratio of 1.46, the product pressure difference versus air volume curve, the calibration curve, and the deviation of the measured air volume from the standard air volume obtained downstream of the elbow local resistance and downstream of the three-way local resistance at 15000m 3/h rated air volume. FIG. 34 shows the structural dimensions of the A-c-2 damper product with an equivalent diameter ratio of 0.837 and an aspect ratio of 1.46, the product pressure difference versus air volume curve, the calibration curve, and the deviation of the measured air volume from the standard air volume obtained downstream of the elbow local resistance and downstream of the three-way local resistance at 15000m 3/h rated air volume.
From the test results of FIGS. 33 and 34, it is seen that the A-c-2 structure product performed well downstream of the tee at an equivalent diameter ratio of 0.837, which is acceptable. The deviation of the test result of the A-c-1 is still larger, so that the equivalent diameter ratio of the A-c-1 structural product is continuously reduced to 0.806, the experimental method is the same as that of the test result shown in figure 35. FIG. 35 shows the structural dimensions of the A-c-1 damper product with an equivalent diameter ratio of 0.806 and an aspect ratio of 1.46, the product pressure difference versus air volume curve, the calibration curve, and the deviation of the measured air volume from the standard air volume obtained downstream of the elbow local resistance and downstream of the three-way local resistance at 15000m 3/h rated air volume.
From the results of FIG. 35, it is clear that the A-c-1-equivalent diameter ratio 0.806 performed less well downstream of the elbow and tee, giving up the product configuration.
From the above experiments, it can be seen that the product structure with the equivalent diameter ratio of A-b-2 to A-c-2 of 0.837 has better performance in the elbow and downstream of the tee. At this time, the pressure drop of the air valve is about 80Pa, so that the structure can be used as an air valve hole plate structure for controlling the rated air quantity of 15000m 3/h.
(IV) conclusion of experiments
Through the experimental process research of the five stages, the air valve hole plate which has better performance at the downstream of the elbow and the tee joint is screened out, and the air valve hole plate which meets the standard and aims at different air volumes is obtained. The final structure of the air valve hole plate is shown in fig. 36-39, the outer structure of the air valve hole plate is an oblate structure, and the structure is internally provided with two holes which are oblate and two circles respectively. Four air valve hole plate structures meeting the requirements are arranged under each air quantity, and the structural parameters comprise an aspect ratio and an equivalent diameter ratio.
FIG. 36 shows four structural dimensions for a vent plate at 5500m 3/h rated air, namely an aspect ratio of 2 when there is one oblong hole in the oblong plate, an equivalent diameter ratio of 0.72 and 0.837, an aspect ratio of 2 when there are two parallel circular holes in the oblong plate, an equivalent diameter ratio of 0.72 and 0.866;
FIG. 37 shows four structural dimensions of a vent plate suitable for 7500m 3/h rated air, namely an aspect ratio of 2 when there is one oblong hole in the oblong hole plate, an equivalent diameter ratio of 0.72 and 0.837, an aspect ratio of 2 when there are two parallel circular holes in the oblong hole plate, an equivalent diameter ratio of 0.72 and 0.837;
FIG. 38 shows four structural dimensions of a vent plate suitable for 10000m 3/h rated air, namely an aspect ratio of 2 when there is one oblong hole in an oblong hole plate, equivalent diameter ratios of 0.72 and 0.837, and an aspect ratio of 2 when there are two parallel circular holes in an oblong hole plate, equivalent diameter ratios of 0.72 and 0.837;
Fig. 39 shows four structural dimensions for a duct aperture plate at a rated air volume of 15000m 3/h, namely an aspect ratio of 2 with an oblong aperture in the oblong aperture plate, an equivalent diameter ratio of 0.72 with two parallel circular apertures in the oblong aperture plate, an equivalent diameter ratio of 0.72 with an aspect ratio of 2, and an equivalent diameter ratio of 0.837 with an aspect ratio of 1.75 and 1.46.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the invention in any way, and some simple modifications, equivalent variations or modifications can be made by those skilled in the art using the teachings disclosed herein, which fall within the scope of the present invention.
Claims (8)
1. The air valve hole plate of the large air volume control valve is characterized in that the air valve hole plate is an oblate hole plate, and two parallel round holes are formed in the oblate hole plate;
the oblate orifice plate is used in an air valve housing for controlling rated air quantity of 5500-10000m 3/h, and when the aspect ratio of the oblate orifice plate is 2, the equivalent diameter ratio of the oblate orifice plate is 0.72-0.866;
The oblate orifice plate is used in an air valve housing for controlling 15000m 3/h rated air quantity, and when the aspect ratio of the oblate orifice plate is 2, the equivalent diameter ratio of the oblate orifice plate is 0.72; the aspect ratio of the oblate is 0.837 when the aspect ratio is 1.75-1.46.
2. The air valve hole plate of the large air volume control valve is characterized in that the air valve hole plate is an oblate hole plate, and an oblate hole is formed in the oblate hole plate;
the oblate orifice plate is used in an air valve housing for controlling rated air quantity of 5500-10000m 3/h, and when the aspect ratio of the oblate orifice plate is 2, the equivalent diameter ratio of the oblate orifice plate is 0.72-0.837;
The oblate orifice plate is used in an air valve housing for controlling 15000m 3/h rated air quantity, and when the aspect ratio of the oblate orifice plate is 2, the equivalent diameter ratio of the oblate orifice plate is 0.72.
3. The large air volume control valve is characterized by comprising an air valve shell and an air valve orifice plate of the large air volume control valve according to claim 1 or 2 arranged in the air valve shell, wherein the air valve shell comprises a straight pipe section, a measuring section and a control section, the air valve orifice plate is arranged in the measuring section, an upstream static pressure ring and a downstream static pressure ring are respectively arranged on the upstream and downstream of the air valve orifice plate, and a regulating valve is arranged in the control section.
4. A large air volume control valve according to claim 3, wherein the distance from the upstream static ring and the downstream static ring to the air valve orifice plate is 0.25D, the length of the straight pipe section is less than or equal to 0.5D, and D is the hydraulic diameter of the air valve housing section.
5. The method for optimally designing the air valve hole plate of the large air volume control valve is characterized by comprising the following steps of:
S1, presetting a plurality of outline structures suitable for an orifice plate of a blast valve in a large-air-volume control valve according to the type of an existing blast pipe and the occupied space of an air valve, wherein initial design parameters in the plurality of outline structures comprise the outline structures of the orifice plate and the internal orifice structures of the orifice plate;
s2, determining the initial aspect ratio and the initial equivalent diameter ratio of pore plates with various appearance structures, and respectively installing the determined various air valve hole plates in an air valve shell to form air volume control valves with various specifications;
S3, calibrating the air valves of the air control valves on a standard test bed respectively to obtain air pressure difference curves corresponding to all pore plates, then installing the air control valves of the air control valves on the elbow test bed and the tee test bed respectively to obtain deviation results of air measurement values and standard air obtained by the air control valves on the downstream of the elbow local resistance piece and the downstream of the tee local resistance piece respectively, and screening out the air control valves with deviation results smaller than preset values, wherein the air valve pore plates corresponding to the air control valves are the air valve pore plates of the large air control valves suitable for corresponding air volumes.
6. The method for optimizing design of a damper orifice plate of a large-volume air control valve according to claim 5, wherein the method further comprises the step of considering a product pressure difference factor of the air control valve in steps S4 and S4, specifically:
S4.1, according to the data of air valve calibration of an air volume control valve on a standard test bed, obtaining a product pressure difference and air volume relation curve, observing the pressure difference under the rated air volume of a product under the condition of the initial equivalent diameter ratio, modifying the equivalent diameter ratio of an air valve orifice plate, and obtaining the equivalent diameter ratio of the air valve orifice plate with the pressure difference of approximately 50Pa under the rated air volume of the product through the air valve calibration of the standard test bed;
And S4.2, respectively mounting air volume control valves formed by air valve pore plates with the pressure difference of 50Pa under the rated air volume of the product obtained in the step S4.1 on an elbow test bed and a tee joint test bed to respectively obtain deviation results of air volume measured values and standard air volumes, which are obtained by the air volume control valves at the downstream of an elbow local resistance part and the downstream of a tee joint local resistance part, and screening out the air volume control valves with the deviation results smaller than a preset value, thereby obtaining the corresponding air valve pore plates in the air volume control valves with the pressure difference of 50Pa under the rated air volume of the product corresponding to the air volume.
7. The method for optimizing design of a damper orifice plate of a large-volume air control valve according to claim 6, further comprising step S4.3, specifically:
S4.3 if the deviation result of the air volume measured value and the standard air volume obtained in the S4.2 is larger than a preset value, selecting an air volume control valve corresponding to an equivalent diameter ratio of which the pressure difference is larger than 50Pa under the rated air volume of the product, and repeating the step S4.2 until the air volume control valve with the deviation result smaller than the preset value is screened out, and obtaining the maximum equivalent diameter ratio of an air valve pore plate corresponding to the air volume control valve under the corresponding air volume.
8. The method for optimizing design of a damper orifice plate of a large-volume air control valve according to claim 6, further comprising step S5, specifically:
s5, if the deviation result of the air volume measured value obtained in S4.2 and the standard air volume is larger than a preset value, modifying the aspect ratio of the air valve orifice plate corresponding to the air volume control valve, setting the equivalent diameter ratio of the air valve orifice plate to be the equivalent diameter ratio of 50Pa of the pressure difference under the rated air volume of the product corresponding to the air volume control valve, repeating the step S4.2, screening the air volume control valve with the deviation result smaller than the preset value, and obtaining the optimal aspect ratio of the air valve orifice plate under the air volume corresponding to the air volume; and if the deviation result is still larger than the preset value, continuously modifying the aspect ratio of the air valve orifice plate, and repeating the steps until the air volume control valve with the deviation result smaller than the preset value is screened out, so that the aspect ratio of the air valve orifice plate under the corresponding air volume is obtained.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111306689A (en) * | 2020-02-24 | 2020-06-19 | 中国人民解放军火箭军工程设计研究院 | Underground ventilation system |
| CN212584381U (en) * | 2020-05-22 | 2021-02-23 | 江苏德丽空调净化设备有限公司 | Novel combined air valve structure for air volume control |
| CN219606056U (en) * | 2023-04-18 | 2023-08-29 | 万帮数字能源股份有限公司 | Quick-assembly type electric air valve |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111306689A (en) * | 2020-02-24 | 2020-06-19 | 中国人民解放军火箭军工程设计研究院 | Underground ventilation system |
| CN212584381U (en) * | 2020-05-22 | 2021-02-23 | 江苏德丽空调净化设备有限公司 | Novel combined air valve structure for air volume control |
| CN219606056U (en) * | 2023-04-18 | 2023-08-29 | 万帮数字能源股份有限公司 | Quick-assembly type electric air valve |
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