Disc structure of a hole-disc type hydraulic dynamometer and its design method
By optimizing the disk structure of the pore-disc hydraulic dynamometer and using an improved pore-type line design, the structural complexity and weight increase caused by increasing absorption power in the prior art are solved, and the absorption power is increased and modification cost is reduced.
Patent Information
- Application Number
- CN202211272285.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-10-18
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2042-10-18
AI Technical Summary
When the existing pore disc hydraulic dynamometer increases the absorbed power, conventional methods lead to complex unit structure, increased weight and increased design and transformation difficulty, and cannot effectively improve the absorbed power.
By optimizing the disc structure, designing the improved hole pattern line as a semi-elliptical arc, and building the improved hole with reference rectangle and elliptical axis to ensure the consistent bending direction, avoid increasing the number and diameter of the discs, and improving the application of the discs on stator and rotor.
Without changing the overall structure and weight of the unit, the power absorption is increased, the modification workload is reduced, the manufacturing cost is reduced, the upgrading and transformation is facilitated, and redesign and verification are avoided.
Smart Images
Figure CN115628835B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of hydraulic dynamometers, and particularly to a disc structure of a hole disc type hydraulic dynamometer and its design method. Background Art
[0002] A hydraulic dynamometer is a device that absorbs and transmits the output power of a power machine by using the frictional torque formed by water on a rotating rotor. Among them, the hole disc type hydraulic dynamometer is a commonly used hydraulic dynamometer. The stator and rotor of the hole disc type hydraulic dynamometer are both disc structures with a number of circular holes.
[0003] For a hole disc type hydraulic dynamometer to match prime movers with gradually increasing power, it is necessary to continuously improve its absorption power. Currently, there are mainly two methods to increase the absorption power of the hole disc type hydraulic dynamometer: increasing the number of discs and increasing the diameter of the discs. However, increasing the number of discs will increase the length of the shaft and the weight of the unit, and the shaft, housing, and bench all need to be redesigned accordingly. Increasing the diameter of the discs will increase the weight of the unit, the shaft needs to be strength-checked, and the discs, housing, and bench also need to be redesigned. These two existing methods will lead to a complex unit structure and increase the difficulty of design and modification while increasing the absorption power of the hole disc type hydraulic dynamometer. Summary of the Invention
[0004] In view of the above problems and technical requirements, the applicant of this application proposes a disc structure of a hole disc type hydraulic dynamometer and its design method. The technical solution of this application is as follows:
[0005] A design method for a disc structure of a hole disc type hydraulic dynamometer, the design method comprising:
[0006] Determine the reference rectangle corresponding to each circular hole formed on the disc body of the original disc of the hole disc type hydraulic dynamometer. Each reference rectangle includes four baseline lines formed at the circular hole and constituting a rectangular structure. The first baseline and the second baseline are parallel to each other, the third baseline and the fourth baseline are parallel to each other, and the lengths of the four baseline lines are determined based on the diameter D of the circular hole corresponding to the reference rectangle;
[0007] For each reference rectangle, construct a first semi-elliptical arc on an ellipse with the first baseline as the first elliptical axis, and construct a second semi-elliptical arc on an ellipse with the second baseline as the first elliptical axis. The curve shapes and bending directions of the two semi-elliptical arcs are the same. The improved hole at the reference rectangle is obtained from the closed hole profile line formed by the two semi-elliptical arcs, the third baseline, and the fourth baseline;
[0008] The improved disk of the orifice-plate hydraulic dynamometer obtained by the design includes the disk body of the original disk, and the improved holes opened at each reference rectangle on the disk body. The bending directions of the semi-elliptical arcs of several improved holes on the improved disk are all along the clockwise direction or the counterclockwise direction of the circumference. The absorption power of the orifice-plate hydraulic dynamometer when carrying the improved disk is greater than that when carrying the original disk.
[0009] A further technical solution thereof is that the method for determining the reference rectangle corresponding to each circular hole opened on the original disk of the orifice-plate hydraulic dynamometer includes:
[0010] Taking the line connecting the center of the circular hole and the rotation center of the unit as the axis of symmetry of the reference rectangle, the third baseline and the fourth baseline of the reference rectangle are respectively tangent to the circular hole and perpendicular to the axis of symmetry of the reference rectangle. The first baseline and the second baseline are parallel to the axis of symmetry of the reference rectangle, the lengths of the first baseline and the second baseline are both D, and the lengths of the third baseline and the fourth baseline are both πD / 4.
[0011] A further technical solution thereof is that the method for constructing two semi-elliptical arcs for each reference rectangle includes:
[0012] Constructing the first semi-elliptical arc on the ellipse with the first baseline of the reference rectangle as the first ellipse axis and the length of the second ellipse axis being B, and constructing the second semi-elliptical arc on the ellipse with the second baseline as the first ellipse axis and the length of the second ellipse axis being B, where 0 < B ≤ 2D.
[0013] A further technical solution thereof is that the method for obtaining the closed orifice profile line based on the two semi-elliptical arcs, the third baseline and the fourth baseline includes:
[0014] When all the interior angles of the closed curve formed by the two semi-elliptical arcs, the third baseline and the fourth baseline are within a predetermined angle range, the closed curve formed by the two semi-elliptical arcs, the third baseline and the fourth baseline is used as the closed orifice profile line;
[0015] When there are interior angles of the closed curve formed by the two semi-elliptical arcs, the third baseline and the fourth baseline that are not within the predetermined angle range, chamfering correction is performed on the closed curve at the position of the interior angle that is not within the predetermined angle range to obtain the closed orifice profile line.
[0016] A further technical solution thereof is that this design method further includes:
[0017] Based on the original disk of the stator disk of the orifice disk hydraulic dynamometer, an improved disk of the stator disk is designed according to the design method, and based on the original disk of the rotor disk of the orifice disk hydraulic dynamometer, an improved disk of the rotor disk is designed according to the design method; the circumferential direction along which the bending direction of the semi-elliptical arc of the improved hole on the improved disk of the stator disk is located is opposite to the circumferential direction along which the bending direction of the semi-elliptical arc of the improved hole on the improved disk of the rotor disk is located.
[0018] A disk structure of an orifice disk hydraulic dynamometer, the disk structure of the improved disk of the orifice disk hydraulic dynamometer is improved and designed based on the disk structure of the original disk of the orifice disk hydraulic dynamometer. The disk structure of the improved disk includes a disk body and each improved hole opened on the disk body. The disk body is the same as the disk body of the original disk. The closed hole profile line of each improved hole is respectively constructed based on a reference rectangle corresponding to a circular hole on the original disk;
[0019] The reference rectangle corresponding to each circular hole on the original disk includes four baseline lines formed at the circular hole and constituting a rectangular structure. The first baseline and the second baseline are parallel to each other, the third baseline and the fourth baseline are parallel to each other, and the lengths of the four baseline lines are determined based on the diameter D of the circular hole corresponding to the reference rectangle;
[0020] The closed hole profile line of each improved hole is obtained based on the third baseline, the fourth baseline of the corresponding reference rectangle, and two constructed semi-elliptical arcs. Among them, the first semi-elliptical arc is located on an ellipse with the first baseline as the first ellipse axis, and the second semi-elliptical arc is located on an ellipse with the second baseline as the first ellipse axis. The curve shapes and bending directions of the two semi-elliptical arcs are the same;
[0021] The bending directions of the semi-elliptical arcs of several improved holes on the improved disk are all along the circumferential clockwise direction or along the circumferential counterclockwise direction.
[0022] A further technical solution of it is that each reference rectangle corresponding to a circular hole on the original disk takes the connection line between the center of the circular hole and the rotation center of the unit as the axis of symmetry. The first baseline and the second baseline are parallel to the axis of symmetry of the reference rectangle. The lengths of the first baseline and the second baseline are both D, and the lengths of the third baseline and the fourth baseline are both πD / 4.
[0023] A further technical solution of it is that the first semi-elliptical arc used to form the closed hole profile line of each improved hole is located on an ellipse with the first baseline as the first ellipse axis and the length of the second ellipse axis being B, and the second semi-elliptical arc is located on an ellipse with the second baseline as the first ellipse axis and the length of the second ellipse axis being B, where 0 < B ≤ 2D.
[0024] A further technical solution of it is that for the closed hole profile line of each improved hole:
[0025] When all the interior angles of the closed curve formed by the two semi-elliptical arcs, the third baseline, and the fourth baseline obtained from the reference rectangle corresponding to the improved hole are within a predetermined angular range, the closed hole profile line of the improved hole is the closed curve formed by the two semi-elliptical arcs, the third baseline, and the fourth baseline.
[0026] When there are interior angles of the closed curve formed by the two semi-elliptical arcs, the third baseline, and the fourth baseline obtained from the reference rectangle corresponding to the improved hole that are not within the predetermined angular range, the closed hole profile line of the improved hole is the closed curve obtained by performing chamfering correction on the closed curve at the positions of the interior angles that are not within the predetermined angular range in the closed curve formed by the two semi-elliptical arcs, the third baseline, and the fourth baseline.
[0027] A further technical solution thereof is that the improved discs of the orifice-disc hydraulic dynamometer include the improved disc of the stator disc and the improved disc of the rotor disc. The disc structure of the improved disc of the stator disc is obtained by improving the design based on the disc structure of the original disc of the stator disc, and the disc structure of the improved disc of the rotor disc is obtained by improving the design based on the disc structure of the original disc of the stator disc; and the circumferential direction along which the semi-elliptical arc of the improved hole on the improved disc of the stator disc bends is opposite to the circumferential direction along which the semi-elliptical arc of the improved hole on the improved disc of the rotor disc bends.
[0028] The beneficial technical effects of this application are:
[0029] This application discloses a disc structure of an orifice-disc hydraulic dynamometer and its design method. The design method of this application is used to improve the design of the improved disc of the orifice-disc hydraulic dynamometer based on the disc structure of the original disc of the orifice-disc hydraulic dynamometer. The improved disc can be directly used to replace the original disc. This approach does not increase the number of original discs or the diameter of the original discs, but is achieved by optimizing the hole-opening structure in the original disc. Therefore, the absorption power of the orifice-disc hydraulic dynamometer can be increased, and the performance of the orifice-disc hydraulic dynamometer can be optimized without changing the overall structure of the unit, increasing the overall weight of the unit, or affecting the rotational inertia of the rotor. Using the design method of this application and the obtained disc structure can greatly reduce the workload of unit modification, save manufacturing costs, and facilitate the upgrade and transformation of existing orifice-disc hydraulic dynamometers, avoiding the need to re-design and check components such as the shaft, housing, and bench of the unit. Description of the Drawings
[0030] Figure 1 is a flowchart of the design method of the disc structure in an embodiment.
[0031] Figure 2 is a schematic diagram of the improved disc of the stator disc obtained by improving the design based on the original disc of the stator disc using the design method of the disc structure in an embodiment.
[0032] Figure 3 It is a schematic diagram of the improved disc of the rotor disc obtained by improving the design based on the original disc of the rotor disc using the disc structure design method in an embodiment.
[0033] Figure 4 It is a schematic process diagram of designing corresponding improved holes from each circular hole opened on the disc body of the original disc in an embodiment.
[0034] Figure 5 It is a comparison experimental data graph of the absorption power when the orifice plate type hydraulic dynamometer is equipped with the improved disc and the absorption power when it is equipped with the original disc in an example. Detailed implementation manners
[0035] The following further describes the detailed implementation manners of the present application with reference to the accompanying drawings.
[0036] The present application discloses a design method for the disc structure of an orifice plate type hydraulic dynamometer. This design method is used to improve the design of the disc structure of the original disc of the orifice plate type hydraulic dynamometer to obtain an improved disc of the orifice plate type hydraulic dynamometer. The improved disc can be directly used to replace the original disc, so that the absorption power of the orifice plate type hydraulic dynamometer when equipped with the improved disc is greater than that when equipped with the original disc. This method does not increase the number of original discs or the diameter of the original discs, but is achieved by optimizing the opening structure in the original disc. Therefore, the absorption power can be increased without changing the overall structure of the unit, without increasing the overall weight of the unit, and without affecting the rotor inertia.
[0037] This design method includes the following steps. Please refer to Figure 1 the flow chart shown:
[0038] Step 120, determine the reference rectangle corresponding to each circular hole opened on the disc body of the original disc of the orifice plate type hydraulic dynamometer.
[0039] The original disc of the orifice plate type hydraulic dynamometer includes the original disc of the stator disc and the original disc of the rotor disc. The disc structures of the original disc of the stator disc and the original disc of the rotor disc are similar, both including a disc body 1 and several circular holes 2 opened on the disc body 1. However, there are differences in the specific structures and specifications of the disc bodies 1 of the stator disc and the rotor disc. Figure 2 shows the front view and the sectional view of the AA section of the original disc of the stator disc in an example. Figure 3 shows the front view and the sectional view of the BB section of the original disc of the rotor disc in an example. Generally, several circles of circular holes 2 arranged along the circumference are opened on the disc body 1, and the specifications of each circle of circular holes 2 are generally the same. The sizes of the circular holes 2 from the outer circle to the inner circle decrease in sequence. As Figure 2Take the example that there are three circles of circular holes 2 on the original disk of the stator disk and two circles of circular holes 2 on the original disk of the rotor disk.
[0040] Regardless of the specific structure, the disk structures of the original disk of the stator disk and the original disk of the rotor disk both include the disk body 1 and the circular holes 2 opened thereon. Therefore, the present application describes the stator disk and the rotor disk uniformly, that is, the original disk in the present application can refer to the original disk of the stator disk or the original disk of the rotor disk.
[0041] Regardless of the specifications, quantities, and arrangement manners of the circular holes 2 opened on the disk body 1 of the original disk, the reference rectangles respectively corresponding to each determined circular hole 2 include four baseline lines formed at the circular hole 2 and constituting a rectangular structure, which are respectively written as L1, L2, L3, and L4. Please refer to Figure 4 , the first baseline L1 and the second baseline L2 are parallel to each other, the third baseline L3 and the fourth baseline L4 are parallel to each other, and the lengths of the four baseline lines are all determined based on the diameter D of the circular hole 2 corresponding to the reference rectangle.
[0042] Please refer to Figure 1 and 3 , in an embodiment, the method for determining the reference rectangle is: taking the connection line between the hole center O1 of the circular hole 2 and the rotation center O0 of the unit as the symmetry axis of the reference rectangle, the third baseline L3 and the fourth baseline L4 of the reference rectangle are respectively tangent to the circular hole 2 and perpendicular to the symmetry axis of the reference rectangle. The first baseline L1 and the second baseline L2 are parallel to the symmetry axis of the reference rectangle. The lengths L2 of the first baseline L1 and the second baseline obtained thereby are both D, and the lengths of the third baseline L3 and the fourth baseline L4 are both the ratio of the area of the circular hole 2 to the diameter D, thus being πD / 4. As described above, the specifications of the circular holes on the disk body of the original disk may be different, so the specifications of the obtained reference rectangles may also be different.
[0043] Step 140, for each reference rectangle, construct a first semi-elliptical arc L5 on the ellipse with the first baseline L1 as the first elliptical axis and located on one side of the first baseline L1, and construct a second semi-elliptical arc L6 on the ellipse with the second baseline L2 as the first elliptical axis and located on one side of the second baseline L2. The curve shapes and bending directions of the two constructed semi-elliptical arcs L5 and L6 are the same. For example Figure 4 take the example that both the two semi-elliptical arcs L5 and L6 are the right semi-elliptical arcs of the ellipse in the figure.
[0044] In one embodiment, the lengths of the first baseline L1 and the second baseline L2 described above are both the diameter D of the corresponding circular hole 2. When constructing the two semi-elliptical arcs: construct the first semi-elliptical arc on the ellipse with the first baseline of the reference rectangle as the first elliptical axis and the length of the second elliptical axis as B, and construct the second semi-elliptical arc on the ellipse with the second baseline as the first elliptical axis and the length of the second elliptical axis as B, where 0 < B ≤ 2D.
[0045] Then, an improved hole at a reference rectangle is obtained based on the closed hole profile line formed by the two semi-elliptical arcs, the third baseline, and the fourth baseline. There are various situations for the closed hole profile line of the improved hole:
[0046] 1. When all the interior angles of the closed curve formed by the two semi-elliptical arcs L5 and L6, the third baseline L3, and the fourth baseline L4 are within a predetermined angular range, the closed curve formed by the two semi-elliptical arcs, the third baseline, and the fourth baseline is used as the closed hole profile line. As shown in a situation in Figure 4 the closed hole profile line is the closed curve formed by connecting L3, L4, L5, and L6.
[0047] 2. When there are interior angles of the closed curve formed by the two semi-elliptical arcs L5 and L6, the third baseline L3, and the fourth baseline L4 that are not within the predetermined angular range, chamfering correction is performed on the closed curve at the position of the interior angle not within the predetermined angular range to obtain the closed hole profile line, and then there are no interior angles not within the predetermined angular range in the obtained closed hole profile line. There are various methods for performing chamfering correction. For example, the closed curve at the position of the interior angle not within the predetermined angular range is changed to a rounded corner or a straight line segment. Then, as shown in another situation in Figure 4 the closed hole profile line is the closed curve formed by connecting L3, L4, L5, L6, the chamfering segment L7, and the chamfering segment L8. The chamfering segment can be a straight line or a curve, and the specific shape of the segment is diverse, which is not limited in this application.
[0048] Although L3, L4, L5, and L6 have formed a closed curve, as between L3 and L5, or between L4 and L5 in Figure 4 a very small acute angle may be formed, which increases the processing difficulty of the subsequent improved disk. By performing chamfering correction, such an acute angle can be avoided, making the improved hole easy to process. The predetermined angular range can be set according to actual needs, and the parameters during chamfering correction can also be set according to the processing accuracy.
[0049] Step 160, the designed improved disk of the orifice plate hydraulic dynamometer includes the disk body 1 of the original disk, and the improved holes 3 opened at each reference rectangle on the disk body 1. The bending directions of the semi-elliptical arcs of several improved holes 3 on the improved disk are all along the clockwise direction or the counterclockwise direction of the circumference.
[0050] In one embodiment, based on a design method, an improved disk of the stator disk of the orifice disk type hydraulic dynamometer is designed from the original disk, and an improved disk of the rotor disk of the orifice disk type hydraulic dynamometer is designed from the original disk based on the design method. When the improved disks of both the stator disk and the rotor disk of the orifice disk type hydraulic dynamometer are implemented using this design method of the present application, the circumferential direction along which the bending direction of the semi-elliptical arc of the improved holes on the improved disk of the stator disk is opposite to the circumferential direction along which the bending direction of the semi-elliptical arc of the improved holes on the improved disk of the rotor disk. Please compare Figure 2 and Figure 3 , in one example, the bending direction of the semi-elliptical arc of the improved hole 3 on the improved disk of the stator disk is along the circumferential counterclockwise direction, while the bending direction of the semi-elliptical arc of the improved hole 3 on the improved disk of the rotor disk is along the circumferential clockwise direction.
[0051] The absorption of the input mechanical energy is mainly achieved by changing the flow state of the water in the chamber, triggering the dissipation of the kinetic energy of the water, and this process mainly occurs in regions with larger vortices and velocity gradients. When the orifice disk type hydraulic dynamometer is equipped with this improved disk, more obvious vortices will be generated in the chamber, and the velocity gradient will also be larger, which can exhibit a higher mechanical energy absorption capacity, so that the absorption power of the orifice disk type hydraulic dynamometer when equipped with this improved disk is greater than that when equipped with the original disk. Please refer to Figure 5 the experimental data comparison graph of the example shown. At the same rotational speed, the curve of the absorption power of the orifice disk type hydraulic dynamometer when equipped with this improved disk is as shown by Figure 5 510 in, and the curve of the absorption power of the orifice disk type hydraulic dynamometer when equipped with the original disk is as shown by Figure 5 520 in.
[0052] Using the design method of the disc structure of the orifice disc type hydraulic dynamometer disclosed in the present application, the present application also discloses a disc structure of the orifice disc type hydraulic dynamometer. The disc structure refers to the improved disc structure, and the disc structure of the improved disc of the orifice disc type hydraulic dynamometer is improved and designed based on the disc structure of the original disc of the orifice disc type hydraulic dynamometer. The disc structure of the improved disc includes a disc body and each improved hole opened on the disc body. The disc body is the same as the disc body of the original disc. The closed hole profile line of each improved hole is respectively constructed based on a reference rectangle corresponding to a circular hole on the original disc. The reference rectangle corresponding to each circular hole on the original disc includes four baseline lines formed at the circular hole and constituting a rectangular structure. The first baseline and the second baseline are parallel to each other, the third baseline and the fourth baseline are parallel to each other, and the lengths of the four baseline lines are determined based on the diameter D of the circular hole corresponding to the reference rectangle. The closed hole profile line of each improved hole is obtained based on the third baseline, the fourth baseline of the corresponding reference rectangle, and two constructed semi-elliptical arcs. Among them, the first semi-elliptical arc is located on an ellipse with the first baseline as the first elliptical axis, and the second semi-elliptical arc is located on an ellipse with the second baseline as the first elliptical axis. The curve shapes and bending directions of the two semi-elliptical arcs are the same. The bending directions of the semi-elliptical arcs of several improved holes on the improved disc are all along the circumferential clockwise direction or along the circumferential counterclockwise direction. Other related technical features can be referred to the description in the design method, and this embodiment will not be elaborated here.
[0053] The above are only the preferred embodiments of the present application, and the present application is not limited to the above embodiments. It can be understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present application should be considered to be included within the protection scope of the present application.
Claims
1. A design method for the disc structure of a hole-disc type hydraulic dynamometer, characterized in that, The design method includes: Determining a reference rectangle corresponding to each circular hole formed in the disk body of the original disk of the orifice disk type hydraulic dynamometer. Each reference rectangle includes four baseline lines that are formed at the circular hole and constitute a rectangular structure. The first baseline and the second baseline are parallel to each other, the third baseline and the fourth baseline are parallel to each other, and the lengths of the four baseline lines are determined based on the diameter D of the circular hole corresponding to the reference rectangle. For each reference rectangle, constructing a first semi-elliptical arc on an ellipse with the first baseline as the first elliptical axis, and constructing a second semi-elliptical arc on an ellipse with the second baseline as the first elliptical axis. The curve shapes and bending directions of the two semi-elliptical arcs are the same. The improved hole at the reference rectangle is obtained from the closed hole profile line formed by the two semi-elliptical arcs, the third baseline, and the fourth baseline. The method for obtaining the closed hole profile line formed by the two semi-elliptical arcs, the third baseline, and the fourth baseline includes: when all interior angles of the closed curve formed by the two semi-elliptical arcs, the third baseline, and the fourth baseline are within a predetermined angular range, the closed curve formed by the two semi-elliptical arcs, the third baseline, and the fourth baseline is used as the closed hole profile line; when there are interior angles of the closed curve formed by the two semi-elliptical arcs, the third baseline, and the fourth baseline that are not within the predetermined angular range, chamfering correction is performed on the closed curve at the position of the interior angle that is not within the predetermined angular range to obtain the closed hole profile line. The improved disk of the orifice disk type hydraulic dynamometer designed includes the disk body of the original disk, and the improved holes formed at each reference rectangle on the disk body. The bending directions of the semi-elliptical arcs of several improved holes on the improved disk are all along the clockwise direction or the counterclockwise direction of the circumference. The absorption power of the orifice disk type hydraulic dynamometer when equipped with the improved disk is greater than the absorption power when equipped with the original disk.
2. The design method according to claim 1, wherein The method for determining the reference rectangle corresponding to each circular hole formed in the original disk of the orifice disk type hydraulic dynamometer includes: Taking the line connecting the center of the circular hole and the rotation center of the unit as the axis of symmetry of the reference rectangle. The third baseline and the fourth baseline of the reference rectangle are respectively tangent to the circular hole and perpendicular to the axis of symmetry of the reference rectangle. The first baseline and the second baseline are parallel to the axis of symmetry of the reference rectangle. The lengths of the first baseline and the second baseline are both D, and the lengths of the third baseline and the fourth baseline are both πD / 4.
3. The design method according to claim 2, characterized in that, The method for constructing two semi-elliptical arcs for each reference rectangle includes: Constructing a first semi-elliptical arc on an ellipse with the first baseline of the reference rectangle as the first elliptical axis and the length of the second elliptical axis being B, and constructing a second semi-elliptical arc on an ellipse with the second baseline as the first elliptical axis and the length of the second elliptical axis being B, where 0 < B ≤ 2D.
4. The design method according to claim 1, characterized in that, The design method further includes: Based on the original disk of the stator disk of the orifice plate hydraulic dynamometer, an improved disk of the stator disk is designed according to the design method, and based on the original disk of the rotor disk of the orifice plate hydraulic dynamometer, an improved disk of the rotor disk is designed according to the design method; the circumferential direction along which the bending direction of the semi-elliptical arc of the improved hole on the improved disk of the stator disk is opposite to the circumferential direction along which the bending direction of the semi-elliptical arc of the improved hole on the improved disk of the rotor disk is located.
5. The disc structure of a hole-disc type hydraulic dynamometer, characterized in that, The disk structure of the improved disk of the orifice plate hydraulic dynamometer is improved and designed based on the disk structure of the original disk of the orifice plate hydraulic dynamometer. The disk structure of the improved disk includes a disk body and each improved hole formed on the disk body. The disk body is the same as the disk body of the original disk. The closed hole profile line of each improved hole is respectively constructed based on a reference rectangle corresponding to a circular hole on the original disk. The reference rectangle corresponding to each circular hole on the original disk includes four baseline lines formed at the circular hole and constituting a rectangular structure. The first baseline and the second baseline are parallel to each other, the third baseline and the fourth baseline are parallel to each other, and the lengths of the four baseline lines are determined based on the diameter D of the circular hole corresponding to the reference rectangle. The closed hole profile line of each improved hole is obtained based on the third baseline, the fourth baseline of the corresponding reference rectangle, and two constructed semi-elliptical arcs. Among them, the first semi-elliptical arc is located on an ellipse with the first baseline as the first elliptical axis, and the second semi-elliptical arc is located on an ellipse with the second baseline as the first elliptical axis. The curve shapes and bending directions of the two semi-elliptical arcs are the same; for the closed hole profile line of each improved hole: when all the interior angles of the closed curve formed by the two semi-elliptical arcs, the third baseline, and the fourth baseline obtained from the reference rectangle corresponding to the improved hole are within a predetermined angle range, the closed hole profile line of the improved hole is the closed curve formed by the two semi-elliptical arcs, the third baseline, and the fourth baseline; when there are interior angles of the closed curve formed by the two semi-elliptical arcs, the third baseline, and the fourth baseline obtained from the reference rectangle corresponding to the improved hole that are not within the predetermined angle range, the closed hole profile line of the improved hole is the closed curve obtained by performing chamfering correction on the closed curve at the position of the interior angle that is not within the predetermined angle range in the closed curve formed by the two semi-elliptical arcs, the third baseline, and the fourth baseline. The bending directions of the semi-elliptical arcs of several improved holes on the improved disk are all along the circumferential clockwise direction or along the circumferential counterclockwise direction.
6. The disc structure of the orifice plate hydraulic dynamometer according to claim 5, characterized in that, Each reference rectangle corresponding to a circular hole on the original disk is symmetric about the connection line between the center of the circular hole and the rotation center of the unit. The first baseline and the second baseline are parallel to the symmetry axis of the reference rectangle, the lengths of the first baseline and the second baseline are both D, and the lengths of the third baseline and the fourth baseline are both πD / 4.
7. The disk structure of the orifice plate hydraulic dynamometer according to claim 6, characterized in that, The first semi-elliptical arc of the closed hole profile line forming each improved hole lies on an ellipse with the first baseline as the first elliptical axis and the length of the second elliptical axis being B, and the second semi-elliptical arc lies on an ellipse with the second baseline as the first elliptical axis and the length of the second elliptical axis being B, where 0 < B ≤ 2D.
8. The disc structure of the orifice plate hydraulic dynamometer according to claim 5, characterized in that, The improved discs of the orifice disc hydraulic dynamometer include the improved discs of the stator disc and the improved discs of the rotor disc. The disc structure of the improved discs of the stator disc is obtained by improving the design based on the disc structure of the original disc of the stator disc, and the disc structure of the improved discs of the rotor disc is obtained by improving the design based on the disc structure of the original disc of the stator disc; and the circumferential direction along which the semi-elliptical arc of the improved hole on the improved disc of the stator disc bends is opposite to the circumferential direction along which the semi-elliptical arc of the improved hole on the improved disc of the rotor disc bends.