Blade curved surface shaping method and device for optimizing water pump lift, medium and product

Abstract

The invention discloses a blade curved surface modification method and device for optimizing the lift of a water pump, a medium and a product, and relates to the field of water pump optimization. According to the method, the local deformation area and deformation quantity of the outlet edge of the suction surface are set and controlled, the continuity and fairness of the suction surface of the impeller are kept, local modification machining of the blades on the original impeller is facilitated, remanufacturing of the impeller is avoided, the optimal design process of the water pump impeller is accelerated, and the development period is shortened.

Description

Technical Field

[0001] The invention relates to the field of water pump optimization, and in particular to a blade surface shaping method, device, medium and product for optimizing the lift of a water pump. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

[0003] After the pump is designed, manufactured and tested, if the head is too low and does not meet the technical requirements, it is usually necessary to grind the outlet area of ​​the suction surface of the impeller according to the test results (such as Figure 2 red area) to further improve hydraulic performance.

[0004] The existing shaping method is to manually adjust the streamlines based on the experience of designers using 3D modeling software (such as UG, CATIA, etc.) to transform them into the required blade surface. However, the smoothness of the transformed curve and the original curve cannot be guaranteed, so the outlet edge usually presents a discontinuous broken line shape (such as Figure 3 As shown in the figure, the continuity of the streamline of the blade suction surface is destroyed, so that the surface of the runner designed in this way is not smooth after processing, and it is difficult to achieve the optimization goal after testing. In addition, the efficiency and effect of the surface modification of the existing operation method are closely related to the experience of the specific personnel in adjusting the curve. The reason is that there is no efficient and flexible modification method that can ensure the smoothness of the surface.

[0005] That is, the existing shaping methods rely heavily on the experience of designers and their familiarity with the use of 3D modeling software, and are usually inefficient. Even with repeated adjustments, it cannot guarantee that every cross-section of the surface remains smooth. The smooth transition between the modified blade area and the unmodified blade area is also a common problem. Summary of the invention

[0006] The purpose of the present invention is to provide a blade surface shaping method, device, medium and product for optimizing the head of a water pump, in view of the defect that the streamlines at the outlet edge in the prior art are discontinuous broken line shapes, which destroys the continuity of the streamlines on the suction surface of the blade. The method, device, medium and product are set and controlled to set and control the local deformation area and deformation amount of the outlet edge of the suction surface, maintain the continuity and smoothness of the suction surface of the impeller, facilitate the local shaping of the blades on the original impeller, avoid re-manufacturing of the impeller, accelerate the optimization design process of the water pump impeller, shorten the development cycle, and thus solve the above-mentioned problems.

[0007] The technical solution of the present invention is as follows:

[0008] A blade surface modification method for optimizing the head of a water pump comprises:

[0009] Step S1: Divide the wing curve into a deformation area and a fixed area;

[0010] Step S2: collecting a discrete point sequence of the curve within the deformation area;

[0011] Step S3: performing bending deformation processing on all discrete points and merging them with the fixed area to form a modified wing curve;

[0012] Step S4: repeating steps S1 to S3 to construct all the modified suction surface airfoil curves;

[0013] Step S5: constructing a new suction surface based on the suction surface airfoil curve constructed in step S4.

[0014] Furthermore, the step S1 comprises:

[0015] The wing-shaped curve is intercepted based on the specified position of the blade, and the wing-shaped curve is divided into a deformation area and a fixed area on the specified length of the suction side curve.

[0016] Furthermore, the step S3 includes:

[0017] Step S31: simplifying the curve in the deformation area into a cantilever;

[0018] Step S32: Calculate the bending amount of the discrete point P0;

[0019] Step S33: Based on the bending amount of the discrete point P0, the normal vector of the discrete point P0 and the deformation amount, the discrete point P0 is subjected to bending deformation processing to obtain a transformed discrete point P2;

[0020] Step S34: repeating steps S31 to S33, performing bending deformation processing on all discrete points, and constructing a deformed curve through all the transformed discrete points;

[0021] Step S35: merging the deformed curve with the fixed area to generate a new wing-shaped curve.

[0022] Furthermore, the step S31 includes:

[0023] The curve in the deformation area is simplified to a cantilever, the maximum bending amount is set to W, the arc length of the curve is L, and the arc length from the discrete point P0 to the right end is L0.

[0024] Furthermore, the calculation formula of the bending amount of the discrete point P0 in step S32 is as follows:

[0025] D=(L0×L0)×W / (L×L)

[0026] in:

[0027] D represents the bending amount of the discrete point P0.

[0028] Furthermore, the calculation formula of the transformed discrete point P2 in step S33 is as follows:

[0029]

[0030] in:

[0031] Represents the normal vector of discrete point P0;

[0032] D represents the deformation of discrete point P0.

[0033] The present invention also provides a computing device, comprising:

[0034] At least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the above-mentioned blade surface modification method for optimizing the water pump head.

[0035] The present invention also proposes a computer terminal storage medium storing computer terminal executable instructions, wherein the computer terminal executable instructions are used to execute the above-mentioned blade surface modification method for optimizing the water pump head.

[0036] The present invention also proposes a computer program product, which, when executed by a processor, is the above-mentioned blade surface modification method for optimizing the lift of a water pump.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. Fast: It can quickly optimize the shape of the curved surface area according to the pump head requirements;

[0039] 2. Flexible: You can set and control the deformation area range, without changing the whole body, only changing the part, and give the streamline different values ​​of bending.

[0040] 3. Smoothness: The constructed shaping streamline is continuous and smooth.

[0041] 4. Shorten the development cycle: Optimize the blade shape on the existing impeller to avoid remanufacturing the runner, speed up the optimization process of the pump impeller, and shorten the development cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 The present invention is a flow chart of a blade surface modification method for optimizing the pump head;

[0043] Figure 2 is a schematic diagram of the outlet area of ​​the suction surface of the impeller;

[0044] Figure 3 A schematic diagram of the shaping result of the existing shaping method;

[0045] Figure 4 This is a schematic diagram after the division in step S1;

[0046] Figure 5 A schematic diagram of a discrete point array collected in step S2;

[0047] Figure 6 is a simplified schematic diagram in step S31;

[0048] Figure 7 is a schematic diagram of the curve after deformation;

[0049] Figure 8 is a schematic diagram of the wing curve after modification;

[0050] Fig. 9 It is a schematic diagram of the airfoil curve of the suction surface after all the modifications;

[0051] Fig.10 Schematic diagram of the new suction surface constructed.

[0052] Description of the accompanying drawings: 1-deformation area, 2-fixed area, 3-discrete point array, 4-new wing curve, 5-new suction surface. DETAILED DESCRIPTION

[0053] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0054] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0055] Embodiment 1

[0056] See also Figure 1-Figure 10 A method for modifying the curved surface of a blade for optimizing the head of a water pump comprises the following steps:

[0057] Step S1: Divide the wing curve into a deformation area 1 and a fixed area 2;

[0058] Step S2: Collect the discrete point sequence 3 of the curve in the deformation area. The collection result is as follows: Figure 5 As shown;

[0059] Step S3: performing bending deformation processing on all discrete points and merging them with the fixed area to form a new wing curve 4;

[0060] Step S4: Repeat steps S1 to S3 to construct the airfoil curve of the suction surface after all the modifications, such as Fig. 9 As shown;

[0061] Step S5: Based on the suction surface airfoil curve constructed in step S4, a new suction surface 5 is constructed, such as Fig.10 shown.

[0062] In this embodiment, specifically, Figure 4 As shown, the step S1 includes:

[0063] The wing-shaped curve is intercepted based on the specified position of the blade, and the wing-shaped curve is divided into a deformation area and a fixed area on the specified length of the suction side curve.

[0064] In this embodiment, specifically, step S3 includes:

[0065] Step S31: simplifying the curve in the deformation area into a cantilever;

[0066] Step S32: Calculate the bending amount of the discrete point P0;

[0067] Step S33: Based on the bending amount, normal vector and deformation amount of the discrete point P0, the discrete point P0 is subjected to bending deformation processing to obtain the transformed discrete point P2, such as Figure 7 As shown;

[0068] Step S34: repeating steps S31 to S33, performing bending deformation processing on all discrete points, and constructing a deformed curve through all the transformed discrete points;

[0069] Step S35: Merge the deformed curve with the fixed area to generate a new wing-shaped curve, such as Figure 8 shown.

[0070] In this embodiment, specifically, Figure 6 As shown, the step S31 includes:

[0071] The curve in the deformation area is simplified to a cantilever, the maximum bending amount is set to W, the arc length of the curve is L, and the arc length from the discrete point P0 to the right end is L0.

[0072] In this embodiment, specifically, the calculation formula of the bending amount of the discrete point P0 in step S32 is as follows:

[0073] D=(L0×L0)×W / (L×L)

[0074] in:

[0075] D represents the bending amount of the discrete point P0.

[0076] In this embodiment, specifically, the calculation formula of the transformed discrete point P2 in step S33 is as follows:

[0077]

[0078] in:

[0079] Represents the normal vector of discrete point P0;

[0080] D represents the deformation of discrete point P0.

[0081] In addition, in some embodiments, a computing device is provided, comprising:

[0082] At least one processor; and a memory in communication with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the above-mentioned blade surface modification method for optimizing the head of a water pump; examples of computing devices include a PC, a tablet computer, a smart phone or a PDA, etc.

[0083] In addition, in some embodiments, a computer terminal storage medium is also proposed, which stores computer terminal executable instructions, and the computer terminal executable instructions are used to execute the above-mentioned blade surface modification method for optimizing the pump head; examples of computer storage media include magnetic storage media (e.g., floppy disks, hard disks, etc.), optical recording media (e.g., CD-ROMs, DVDs, etc.) or memories, such as memory cards, ROMs or RAMs, etc. Computer storage media can also be distributed on network-connected computer systems, such as application stores.

[0084] In addition, in some embodiments, a computer program product is also proposed, and when the computer program is executed by a processor, the above-mentioned blade surface modification method for optimizing the lift of a water pump is implemented.

[0085] The above-mentioned embodiments only express the specific implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the protection scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the technical solution concept of the present application, and these all belong to the protection scope of the present application.

[0086] This background section is provided to generally present the context of the invention, and the work of the presently named inventors, the work to the extent described in this background section, and aspects of this section that did not constitute prior art at the time of application are neither explicitly nor implicitly admitted to be prior art to the present invention.

Claims

1. A method for modifying the curved surface of a blade for optimizing the head of a water pump, characterized in that: include: Step S1: Divide the wing curve into a deformation area and a fixed area; Step S2: collecting a discrete point sequence of the curve within the deformation area; Step S3: performing bending deformation processing on all discrete points and merging them with the fixed area to form a modified wing curve; Step S4: repeating steps S1 to S3 to construct all the modified suction surface airfoil curves; Step S5: constructing a new suction surface based on the suction surface airfoil curve constructed in step S4.

2. A blade surface modification method for optimizing pump head according to claim 1, characterized in that: The step S1 comprises: The wing-shaped curve is intercepted based on the specified position of the blade, and the wing-shaped curve is divided into a deformation area and a fixed area on the specified length of the suction side curve.

3. A blade surface modification method for optimizing pump head according to claim 2, characterized in that: The step S3 comprises: Step S31: simplifying the curve in the deformation area into a cantilever; Step S32: Calculate the bending amount of the discrete point P0; Step S33: Based on the bending amount of the discrete point P0, the normal vector of the discrete point P0 and the deformation amount, the discrete point P0 is subjected to bending deformation processing to obtain a transformed discrete point P2; Step S34: repeating steps S31 to S33, performing bending deformation processing on all discrete points, and constructing a deformed curve through all the transformed discrete points; Step S35: merging the deformed curve with the fixed area to generate a new wing-shaped curve.

4. A blade surface modification method for optimizing pump head according to claim 3, characterized in that: The step S31 comprises: The curve in the deformation area is simplified to a cantilever, the maximum bending amount is set to W, the arc length of the curve is L, and the arc length from the discrete point P0 to the right end is L0.

5. A blade surface modification method for optimizing pump head according to claim 4, characterized in that: The calculation formula of the bending amount of the discrete point P0 in step S32 is as follows: D=(L0×L0)×W / (L×L) in: D represents the bending amount of the discrete point P0.

6. A blade surface modification method for optimizing pump head according to claim 5, characterized in that: The calculation formula of the transformed discrete point P2 in step S33 is as follows: in: Represents the normal vector of discrete point P0; D represents the deformation of discrete point P0.

7. A computing device, characterized in that: include: at least one processor; And a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute a blade surface shaping method for optimizing the water pump head as described in any one of claims 1-6.

8. A computer terminal storage medium storing computer terminal executable instructions, characterized in that: The computer terminal executable instructions are used to execute a blade surface modification method for optimizing the water pump head as described in any one of claims 1-6.

9. A computer program product, characterized in that When the computer program is executed by a processor, a blade surface shaping method for optimizing the pump head as described in any one of claims 1 to 6 is implemented.

Images