A data collection fixture and method for a closed impeller

Abstract

The present invention relates to a data acquisition fixture for a closed impeller, comprising a fixture and a probe, wherein the probe is composed of a probe head and a probe rod, wherein the probe rod is made of soft steel that can be deformed under the action of an external force, and the shape of the probe rod matches the shape of the blades of the closed impeller. The outer end of the probe rod is detachably fixed to the fixture, and the inner end of the probe rod is provided with a probe head, wherein the needle tip of the probe head is located on the plane where the bottom surface of the fixture is located, or the needle tip of the probe head is located close to the plane where the bottom surface of the fixture is located. The present invention also relates to a method for data acquisition of a closed impeller using the above-mentioned acquisition fixture. The acquisition fixture of the present invention has the advantages of simple structure and manufacture, and easy use. The acquisition method of the present invention has the advantages of rapid acquisition and modeling of blade data without damaging the closed impeller, saving customers a lot of money.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal pumps, and in particular to a data acquisition tool and method for a closed impeller. Background Art

[0002] The impeller of a centrifugal pump is the core part of the centrifugal pump, which directly determines the efficiency, performance, NPSH and other important parameters of the pump. Impellers are divided into open impellers, semi-open impellers and closed impellers. Among them, the three-dimensional laser scanner can collect almost all point cloud data of the open impeller and semi-open impeller. For the closed impeller, which is also the impeller required by API 610, it is difficult to collect the data of the internal blades without destroying the impeller because of the front and rear covers. Even if the part is visible to our human eyes, the scanner may not be able to collect it due to the pupil distance.

[0003] At present, the data collection of closed impellers usually involves fitting the point cloud of the inlet and outlet parts, or scanning the mold after injecting the molding agent. Among them, the method of collecting the point cloud of the inlet and outlet parts for fitting takes less time to scan, but takes longer time to fit, and because the collected data only has visible cloud points of the inlet and outlet parts, the fitting accuracy is not enough. The method of injecting the molding agent into the mold and then scanning the mold not only has high molding costs and takes a long time, but also easily leads to errors in the collected data due to the shrinkage of the molding agent and the insufficient number of fitting point clouds. Summary of the invention

[0004] The invention provides a data collection fixture and method for a closed impeller for quickly collecting blade data without damaging the impeller.

[0005] In order to achieve the above purpose, the following technical solutions are adopted.

[0006] The present invention provides a data acquisition fixture for a closed impeller, comprising a clamp and a probe, wherein the probe consists of a probe head and a probe rod, the probe rod is made of soft steel that can be deformed under the action of an external force, the shape of the probe rod is consistent with the shape of a blade of the closed impeller, the outer end of the probe rod is detachably fixed to the clamp, the inner end of the probe rod is provided with a probe head, the needle tip of the probe head is located on the plane where the bottom surface of the clamp is located, or the needle tip of the probe head is located close to the plane where the bottom surface of the clamp is located. The data acquisition fixture for a closed impeller of the present invention is mainly composed of a probe and a clamp for fixing the probe, and has few overall parts and components and a simple structure. The probe is made of soft deformable steel and is composed of a probe rod and a probe head. The shape of the probe rod is designed to match the shape of the blade of the closed impeller, which is convenient for controlling the probe to extend into an invisible area in the impeller by operating the clamp, thereby providing a basic guarantee for the subsequent contact between the probe head and the blade. The probe head is arranged at the inner end of the probe rod, and the needle tip of the probe head is located close to the plane where the bottom surface of the clamp is located or on the plane where the bottom surface of the clamp is located, so that when the operator operates the clamp, on the one hand, the needle tip of the probe head contacts the blade, and on the other hand, the needle tip of the probe head is always located close to or on the plane where the bottom surface of the clamp is located, thereby providing a calculation basis for subsequent 3D scanning, so that after 3D scanning of the clamp, the position of the contact point between the needle tip of the probe head and the blade can be quickly determined by the position of the clamp, thereby realizing data acquisition of the blade. It is not only convenient to operate, but also accurate and fast in data acquisition.

[0007] Furthermore, the probe head is hook-shaped. The design of the hook-shaped probe head enables the operator to control the probe head to contact any position of the blade working surface when operating the fixture, thereby ensuring the number of cloud points of the probe-collected data and further ensuring the accuracy of the probe-collected data.

[0008] Furthermore, the probe head is arranged in a hook shape from the inner end of the probe rod to the plane where the bottom surface of the fixture is located. The hook-shaped inclined arrangement of the probe head makes the needle tip of the probe head a certain distance away from the probe rod. Since the working surface of the blade is a curved surface structure, the needle tip of the probe head is a certain distance away from the probe rod, which effectively ensures that the needle tip of the probe head can contact any position of the working surface of the blade during the collection operation, further ensuring the accuracy of the probe collection data.

[0009] Furthermore, the probe head and the probe rod are an integrated structure. When the integrated structure is adopted, the probe rod is a solid structure. After the probe rod is inserted into the impeller to form a shape that matches the blade, the inner end of the probe rod can be processed into a hook-shaped probe head. The integrated structure is more solid and easy to process; or the probe head and the probe rod are a split structure. When the split structure is adopted, the probe rod is a hollow tubular structure. The probe head is made of solid material for cutting and bending. The tip of the probe head is located at the outer end, and the other end is inserted into the hollow tube of the probe rod. Since the probe rod itself can be bent into a curved shape that matches the blade in the impeller, after the probe head is inserted into the probe rod and then bent and cut, the probe head can be firmly fixed in the probe rod under the action of the bending force. The probe head and the probe rod can be designed as an integrated structure or a split structure, providing users with a variety of options, making the production and operation more flexible and convenient.

[0010] Furthermore, the fixture is a flat structure, and the bottom surface of the fixture is a plane. The fixture is made into a flat structure, and can be directly prepared by using a plate, which is not only simple to prepare, but also effectively saves materials; the bottom surface of the fixture is set as a plane, which is convenient for the installation of the fixture on the one hand, and on the other hand, it is convenient for the tip of the probe head to approach or be on the plane where the bottom surface of the fixture is located after the probe head is made, which is convenient for subsequent 3D scanning, and it is convenient to use the spatial coordinate position relationship to obtain the contact position between the probe head and the blade by scanning the fixture, thereby realizing data collection of the working surface of the blade.

[0011] Furthermore, the fixture is provided with a through hole extending from one side to the other side, and the probe is installed and fixed in the through hole. The through hole is provided so that the probe can be laterally inserted into the fixture, so that the operator can control the depth and position of the probe extending into the impeller while operating the fixture, which is convenient for operation.

[0012] Furthermore, the fixture is provided with an adjustment hole arranged perpendicular to the through hole, the adjustment hole is arranged to penetrate outward from the through hole, and an adjustment member is arranged in the adjustment hole. The arrangement of the adjustment member allows the probe to be fastened in the through hole in the fixture through the adjustment member after the probe is inserted into the fixture, so that the probe is fixed firmly.

[0013] The present invention also provides a method for collecting data of a closed impeller using the data collection fixture of the closed impeller, comprising the following steps:

[0014] S1, preparation of the jig, including the preparation of the probe and the fixture. The preparation of the probe is to first use a copper bar or iron wire made of steel that can be deformed under the action of external force to penetrate into the impeller flow channel to deform it into a shape that matches the blade, and then prepare a probe head at the inner end of the bent probe; then select a flat steel block to prepare the fixture, drill a through hole on the steel block for installing the probe, and drill an adjustment hole on the steel block that is perpendicular to the through hole and penetrates the steel block from the through hole outward, and an adjustment piece is arranged in the adjustment hole to fasten the probe installed in the through hole;

[0015] S2, scanning blade data, including,

[0016] S2.1, data scanning of the visible part of the impeller, using a 3D scanner to scan the outer shape of the impeller and the visible parts of the inlet and outlet according to the conventional scanning method;

[0017] S2.2, data scanning of the invisible part of the impeller, operating the fixture to extend the probe into the invisible part of the impeller, and making the probe head of the probe contact with the working surface of the blade, and then using the 3D scanner to scan the working surface data of the invisible position closed by the blade and the front cover plate and the rear cover plate;

[0018] S2.3, repeat S2.1 and S2.2 multiple times until the working surface data of the entire blade is obtained.

[0019] Furthermore, in the above step S2, the data collection of the blade working surface includes data collection of the top of the working surface and data collection of the bottom of the working surface. The data collection step of the top of the working surface is to operate the fixture, extend the probe into an invisible position in the impeller, and make the probe head of the probe contact the intersection of the blade and the front cover plate, and then scan the fixture position through a 3D scanner, and repeat this process multiple times until the data of the top of the entire blade working surface is collected; the data collection step of the bottom of the working surface is to operate the fixture, extend the probe into an invisible position in the impeller, and make the probe head of the probe contact the intersection of the blade and the rear cover plate, and then scan the fixture position through a 3D scanner, and repeat this process multiple times until the data of the bottom of the entire blade working surface is collected.

[0020] Compared with the prior art, the data collection fixture and method of the closed impeller of the present invention has the following beneficial effects:

[0021] First, the structure and manufacture are simple. The data acquisition fixture of the closed impeller of the present invention is mainly composed of a probe and a fixture for fixing the probe. The overall components are small, and the structure is not only simple, but also easy and convenient to manufacture.

[0022] Second, data collection is accurate and fast. The probe is made of soft deformable steel and consists of a probe rod and a probe head. The shape of the probe rod is designed to match the shape of the blade of the closed impeller, which is convenient for the subsequent control of the probe to extend into the invisible area of ​​the impeller through the operating fixture, providing a basic guarantee for the subsequent contact between the probe head and the blade; the setting of the probe head, the probe head is set at the inner end of the probe rod, and the needle tip of the probe head is close to the plane where the bottom surface of the fixture is located or on the plane where the bottom surface of the fixture is located, so that when the operator operates the fixture, on the one hand, the needle tip of the probe head contacts the blade, and on the other hand, the needle tip of the probe head is always close to or on the plane where the bottom surface of the fixture is located, providing a calculation basis for subsequent 3D scanning, so that after the 3D scanning fixture, the position of the contact point between the needle tip of the probe head and the blade can be quickly determined by the position of the fixture, thereby realizing data collection of the blade. It is not only convenient to operate, but also accurate and fast in data collection;

[0023] Third, it is easy to use. When in use, the operator controls the position of the probe into the impeller by operating the fixture so that it contacts the working surface of the blade inside the impeller. The fixture is located outside the impeller, and its operation and use are convenient and quick;

[0024] Fourth, the collection process does not need to destroy the closed impeller. The data collection of the present invention is carried out by preparing a collection fixture. The operator operates the fixture located outside the impeller, inserts the probe on the fixture into the impeller and contacts the blade, and then scans the position of the fixture with a 3D scanner. The contact position between the probe and the working surface of the blade is calculated by the position of the fixture, and the cloud point data of the blade is collected. This method can quickly, efficiently and accurately obtain the cloud point data of the blade without destroying the impeller, and provide accurate data for the subsequent reverse modeling of the impeller.

[0025] Fifth, reverse modeling can be performed. The present invention combines data acquisition with reverse modeling. The visible and invisible parts of the impeller are scanned separately through 3D laser scanning, and then the data collected by the 3D laser scanning is combined with the 3D design software to perform 3D modeling of the impeller. Then, the 3D impeller is made through 3D printing technology. This method makes full use of the convenience of 3D laser scanning and 3D computer technology, organically combining the two, and can perform 100% modeling in a relatively short time. Combined with 3D printing precision casting, it not only takes less time, but also has low cost, saving users time cost and a lot of money. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A three-dimensional diagram of a data collection fixture for a closed impeller of the present invention;

[0027] Figure 2 This is a front view of the data collection fixture for the closed impeller of the present invention;

[0028] Figure 3 This is a stereoscopic diagram of the probe in the data acquisition fixture of the closed impeller of the present invention. DETAILED DESCRIPTION

[0029] The data collection fixture and method for the closed impeller of the present invention will be further described in detail below in conjunction with specific embodiments.

[0030] Example 1

[0031] Reference Figures 1 to 3 A non-limiting embodiment of the present invention provides a data acquisition fixture for a closed impeller, comprising a fixture 10 and a probe 20, wherein the probe 20 is composed of a probe head 21 and a probe rod 22, wherein the probe rod 22 is made of soft steel that can be deformed under the action of an external force, and the shape of the probe rod 22 is consistent with the shape of the blades of the closed impeller, and the outer end of the probe rod 22 is detachably fixed to the fixture 10, and the inner end of the probe rod 22 is provided with a probe head 21, and the needle tip of the probe head 21 is located on the plane where the bottom surface 11 of the fixture 10 is located, or the needle tip of the probe head 21 is located close to the plane where the bottom surface 11 of the fixture 10 is located. In this embodiment, the fixture is mainly composed of a probe 20 and a clamp 10 for fixing the probe 20, wherein the clamp 10 is made of a steel block, and the probe 20 is made of a slender steel material, and the overall components are few and the structure is simple; specifically, the probe 20 is made of soft deformable steel, and is composed of a probe rod 22 and a probe head 21, and the shape of the probe rod 22 is designed to match the shape of the blade of the closed impeller, which is convenient for the subsequent control of the probe 20 to extend into the invisible area of ​​the impeller by operating the clamp 10, providing a basic guarantee for the subsequent contact between the probe head 21 and the blade; the setting of the probe head 21, the probe head 21 is set on the probe rod 22, and the needle tip of the probe head 21 is located close to the plane where the bottom surface 11 of the fixture 10 is located or on the plane where the bottom surface 11 of the fixture 10 is located, so that when the operator operates the fixture 10, on the one hand, the needle tip of the probe head 21 is in contact with the blade, and on the other hand, the needle tip of the probe head 21 is always located close to or on the plane where the bottom surface 11 of the fixture 10 is located, providing a calculation basis for subsequent 3D scanning, so that after the 3D scanning fixture 10, the position of the contact point between the needle tip of the probe head 21 and the blade can be quickly determined by the position of the fixture 10, thereby realizing data collection of the blade, which is not only convenient to operate, but also accurate and fast in data collection.

[0032] Reference Figures 1 to 3 In a non-limiting embodiment of the present invention, the probe head 21 is hook-shaped. The design of the hook-shaped probe head 21 enables the operator to control the probe head 21 to contact any position of the blade working surface when operating the fixture 10, ensuring the number of cloud points of the data collected by the probe 20, and further ensuring the accuracy of the data collected by the probe 20.

[0033] Reference Figures 1 to 3 In a non-limiting embodiment of the present invention, the probe head 21 is arranged in a hook shape from the inner end of the probe rod 22 to the plane where the bottom surface 11 of the fixture 10 is located. The hook-shaped inclined arrangement of the probe head 21 makes the needle tip of the probe head 21 a certain distance away from the probe rod 22. Since the working surface of the blade is a curved surface structure, the needle tip of the probe head 21 is a certain distance away from the probe rod 22, which effectively ensures that the needle tip of the probe head 21 can contact any position of the working surface of the blade during the collection operation, further ensuring the accuracy of the data collected by the probe 20.

[0034] Reference Figures 1 to 3 In a non-limiting embodiment of the present invention, the probe head 21 and the probe rod 22 are an integral structure. In this embodiment, the probe rod 22 is designed as a solid structure. After the probe rod 22 is inserted into the impeller to form a shape that matches the blade, the inner end of the probe rod 22 is processed into a hook-shaped probe head 21. The integral structure is more solid and easy to process. Of course, in addition to the above-mentioned probe head 21 and the probe rod 22 being an integral structure, the probe head 21 and the probe rod 22 can also be designed as a separate structure. In this case, the probe rod 22 is a hollow tubular structure, and the probe head 21 is cut and bent using a solid material. The end of the probe head 21 with a pointed tip is located at the outer end, and the other end is inserted into the hollow tube of the probe rod 22. Since the probe rod 22 itself can be bent into a curved shape that matches the blade in the impeller, after the probe head 21 is inserted into the probe rod 22 and then bent and cut, the probe head 21 can be firmly fixed in the probe rod 22 under the action of the bending force. The probe head 21 and the probe rod 22 can be designed as an integrated structure or a split structure, which provides users with multiple choices and makes the manufacturing and operation more flexible and convenient.

[0035] Reference Figure 1 and Figure 2 In a non-limiting embodiment of the present invention, the fixture 10 is a flat structure, and the bottom surface 11 of the fixture 10 is a plane. The fixture 10 is made into a flat structure, and can be directly prepared by using a plate, which is not only simple to prepare, but also effectively saves materials; the bottom surface 11 of the fixture 10 is set as a plane, which is convenient for the installation of the fixture 10 on the one hand, and on the other hand, it is convenient for the tip of the probe head 21 to approach or be on the plane where the bottom surface 11 of the fixture 10 is located after the probe head 21 is made, which is convenient for subsequent 3D scanning, and it is convenient to use the spatial coordinate position relationship to obtain the position where the probe head 21 contacts the blade by scanning the fixture 10, thereby realizing data collection of the working surface of the blade.

[0036] Reference Figure 1 and Figure 2In a non-limiting embodiment of the present invention, the fixture 10 is provided with a through hole 12 that runs from one side to the other side, and the through hole 12 is used to install and fix the probe 20. The provision of the through hole 12 allows the probe 20 to penetrate the fixture 10 horizontally, so that the operator can control the depth and position of the probe 20 extending into the impeller while operating the fixture 10, which is convenient for operation.

[0037] Reference Figure 1 and Figure 2 In a non-limiting embodiment of the present invention, the fixture 10 is provided with an adjustment hole 14 arranged perpendicular to the through hole 12, the adjustment hole 14 is arranged to penetrate outward from the through hole 12, and an adjustment member 30 is arranged in the adjustment hole 14. The arrangement of the adjustment member 30 allows the probe 20 to be fastened in the through hole 12 in the fixture 10 through the adjustment member 30 after the probe 20 is inserted into the fixture 10, so that the probe 20 is fixed firmly.

[0038] Reference Figure 1 and Figure 2 In order to improve the working flexibility and accuracy of the fixture of the present invention, a mounting hole 14 is set in the center of the fixture 10, and the fixture 10 is mounted on a rotating tripod (not shown in the figure) through the mounting hole 14. The rotating tripod is an existing tripod on the market, such as a camera tripod, etc., which will not be described in detail here. After the fixture 10 is mounted on the rotating tripod, the direction of the fixture 10 can be quickly and conveniently adjusted, and then the probe 20 is controlled by the fixture 10 to quickly and conveniently extend into the impeller to contact the blades to collect blade data.

[0039] Example 2

[0040] Reference Figures 1 to 3 Another non-limiting embodiment of the present invention is a method for collecting data of a closed impeller using the above-mentioned closed impeller data collection fixture, comprising the following steps:

[0041] S1, preparation of the jig, including preparation of the probe 20 and the fixture 10, the preparation of the probe 20 is firstly to use a copper bar or iron wire made of steel that can be deformed under the action of external force to penetrate into the impeller flow channel to deform it into a shape that matches the blade, and then prepare a probe head 21 at the inner end of the bent probe 20; then select a flat steel block to prepare the fixture 10, drill a through hole 12 on the steel block for installing the probe 20, and drill an adjustment hole 14 on the steel block that is perpendicular to the through hole 12 and penetrates the steel block outward from the through hole 12, and an adjustment member 30 is arranged in the adjustment hole 14 for fastening the probe 20 installed in the through hole 12; because in the preparation process of the jig, the probe 20 is first penetrated into the impeller flow channel to deform it into a shape that matches the blade, and the probe head 21 is installed at the inner end of the probe 20, and the prepared probe 20 is installed on the prepared fixture 10 and fixed by the adjustment member 30. Specifically, a mounting hole 14 is also provided at the center of the fixture 10. During operation, the fixture 10 is installed on the operating frame through the mounting hole 14, and the operator operates the fixture 10 to turn so that the probe 20 penetrates into the impeller and contacts the working surface of the blade. During the operation, the endoscope is connected to the endoscope through a mobile phone or the operator holds a flashlight to visually observe whether the probe head 21 contacts the working surface of the blade, and then the position of the fixture 10 is scanned by a 3D scanner. The position where the probe head 21 contacts the working surface of the blade is calculated through the position of the fixture 10, and the blade working surface data is collected. The specific calculation method of the position of the probe head 21 is as follows: since the needle tip of the probe head 21 is in the plane where the bottom surface 11 of the fixture 10 is located, according to the principle of the mathematical coordinate system, a reference point is taken on the fixture 10 as the origin of the coordinate system, and the needle tip of the probe head 21 is a point in the coordinate system. After the fixture is manufactured, the relative position of the needle tip of the probe head 21 and the reference point of the fixture 10 is obtained by a 3D scanner or a measuring tool. Since the probe 20 is fixed on the fixture 10, the needle tip of the probe head 21 and the center position of the fixture 10 remain unchanged during the process of data collection by the probe 20. Therefore, after scanning the position of the fixture 10 with a 3D scanner, the needle tip position of the probe head 21, that is, the contact position of the probe 20 with the working surface of the blade, can be automatically calculated.

[0042] S2, scanning blade data, including,

[0043] S2.1, data scanning of the visible part of the impeller, using a 3D scanner to scan the outer shape of the impeller and the visible parts of the inlet and outlet according to the conventional scanning method. The visible part of the impeller is scanned using a conventional scanning method, which is more convenient and faster;

[0044] S2.2, data scanning of the invisible part of the impeller, operating the fixture 10 to make the probe 20 extend into the invisible part of the impeller, and make the probe head 21 of the probe 20 contact with the working surface of the blade, connecting the endoscope through a mobile phone or computer device, and putting the endoscope into the position of the working surface to be collected on the impeller to observe whether the probe head 21 contacts with the working surface of the blade, and then use a 3D scanner to scan the working surface data of the invisible position closed by the blade and the front cover plate and the rear cover plate;

[0045] S2.3, repeat S2.1 and S2.2 multiple times until the working surface data of the entire blade is obtained.

[0046] In this embodiment, the data collection of the blade working surface includes data collection of the top of the working surface and data collection of the bottom of the working surface. The data collection step of the top of the working surface is to operate the fixture 10, extend the probe 20 into an invisible position in the impeller, and make the probe head 21 of the probe 20 contact the intersection of the blade and the front cover plate, and then scan the position of the fixture 10 through a 3D scanner, and repeat this process multiple times until the data of the top of the entire blade working surface is collected; the data collection step of the bottom of the working surface is to operate the fixture 10, extend the probe 20 into an invisible position in the impeller, and make the probe head 21 of the probe 20 contact the intersection of the blade and the rear cover plate, and then scan the position of the fixture 10 through a 3D scanner, and repeat this process multiple times until the data of the bottom of the entire blade working surface is collected. The operator operates the fixture 10 located outside the impeller to extend the probe 20 fixed on the fixture 10 into the impeller and make the probe 20 contact the blade working surface, and then obtains the data of the probe 20 at the blade by scanning the position of the fixture 10. The method is used to collect data from multiple positions on the blade until the data collection of the blade working surface is completed, and the collected data of the blade working surface is transmitted to the control system for storage. The closed impeller data collection method of the present invention is used to collect data on the blade without destroying the impeller, and the data collection is accurate and fast. It effectively solves the problem of destroying the impeller when collecting blade data of the closed impeller in the prior art.

[0047] In this embodiment, before preparing the probe 20, the pre-processing of the impeller is also included, specifically cleaning the impeller and selecting the blades. First, the existing closed impeller is cleaned, and the marking points are attached to the outer surface of the cover plate of the closed impeller to facilitate the subsequent 3D scanner scanning positioning and data collection accuracy. Then, a blade with a relatively good appearance is selected by visual inspection for the preparation of the probe 20, so that the shape of the probe 20 is more consistent with the blade and more accurate, thereby providing a guarantee for the subsequent 3D scanning data collection and making the data collection more accurate.

[0048] The data acquisition method of the closed impeller of the present invention is used to collect data on the blade. After the blade data is collected, the blade modeling of the closed impeller is carried out through 3D modeling software. First, the reference point position of the fixture 10 (that is, the selected reference point position of the fixture 10) is accurately located in the reverse software relative to the X-axis and the Y-axis, and the contact position of the probe 20 with the blade working surface and the front cover plate is inversely calculated, that is, the actual position of the collected working surface top data is inversely calculated, and all points are connected into a 3D spline curve to obtain the data spline of the blade working surface top. To ensure the accuracy of the modeling, if there are protruding points or the curve is not smooth, the nearby points should be re-measured; then, the reference point position of the fixture 10 (that is, the selected reference point position of the fixture 10) is accurately located in the reverse software relative to the X-axis and the Y-axis , and inversely calculate the contact position between the probe 20 and the blade working surface and the rear cover plate, that is, inversely calculate the actual position of the collected data at the bottom of the working surface, and connect all points into a 3D spline curve to obtain the data spline line at the bottom of the blade working surface. To ensure the accuracy of modeling, if there are protruding points or the curve is not smooth, the nearby points should be re-measured; then the two spline curves of the data spline line at the top of the blade working surface and the data spline line at the bottom of the blade working surface are lofted to form a three-dimensional surface, which is the working surface of the blade; then the three-dimensional surface is directly assigned with the blade thickness, and a complete blade modeling is completed. The same method as above can also be used to collect the non-working surface of the blade, and then a complete blade modeling is obtained by modeling the working surface of the blade and the non-working surface of the blade. In this way, the above method is used, or the modeling of other blades on the impeller is mirrored according to the modeled blades and the number of blades of the impeller, until the blade modeling of the entire impeller is completed. This method combines the blade data collected by the closed impeller data collection method with 3D design software, and reverse models the impeller through the 3D design software to obtain the 3D modeling of the impeller. After the modeling is completed, it is then 3D printed and precision cast. It achieves 100% accurate modeling in a short time and obtains the impeller through 3D printing, which effectively solves the problem of large error in the impeller size obtained due to the need to destroy the cover plate and inaccurate data collection in the prior art.

[0049] The above embodiments are only specific embodiments of the present invention, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, and these obvious replacement forms all belong to the protection scope of the present invention.

Claims

1. A data acquisition fixture for a closed impeller. Features: It includes a clamp and a probe, the clamp is a flat structure made of a steel block, the bottom surface of the clamp is a plane, the probe is made of a slender steel material, the probe consists of a probe head and a probe rod, the probe rod is made of soft steel material that can be deformed under the action of external force, the shape of the probe rod is consistent with the shape of the blades of the closed impeller, the outer end of the probe rod is detachably fixed to the clamp, the inner end of the probe rod is provided with a probe head, the needle tip of the probe head is located on the plane where the bottom surface of the clamp is located, or the needle tip of the probe head is located close to the plane where the bottom surface of the clamp is located.

2. The data acquisition fixture for the closed impeller according to claim 1, Features: The probe head is hook-shaped.

3. The data acquisition fixture for the closed impeller according to claim 2, Features: The probe head is arranged in a hook shape and tilted from the inner end of the probe rod to the plane where the bottom surface of the clamp is located.

4. The data acquisition fixture for the closed impeller according to claim 3, Features: The probe head and the probe rod are an integrated structure; or the probe head and the probe rod are separate structures.

5. The data acquisition fixture for the closed impeller according to claim 4, Features: The probe rod is a solid structure or a hollow tubular structure.

6. A data acquisition jig for a closed impeller according to any one of claims 1 to 5, Features: The fixture is provided with a through hole which runs from one side to the other side, and the through hole is used for installing and fixing the probe.

7. The data acquisition fixture for the closed impeller according to claim 6, Features: The clamp is provided with an adjustment hole arranged perpendicular to the through hole. The adjustment hole is arranged to penetrate outward from the through hole, and an adjustment piece is arranged in the adjustment hole.

8. A method for collecting data of a closed impeller using the data collection fixture for a closed impeller according to any one of claims 1 to 7, Features: The following steps are included: S1, preparation of the jig, including the preparation of the probe and the fixture. The preparation of the probe is to first use a steel bar made of a deformable steel material under the action of an external force to penetrate into the impeller flow channel to deform it into a shape that matches the blade, and then prepare a probe head at the inner end of the bent probe; then select a flat steel block to prepare the fixture, drill a through hole on the steel block for installing the probe, and drill an adjustment hole on the steel block that is perpendicular to the through hole and penetrates the steel block from the through hole outward, and an adjustment piece is arranged in the adjustment hole to fasten the probe installed in the through hole; S2, scanning blade data, including, S2.1, data scanning of the visible part of the impeller, using a 3D scanner to scan the outer shape of the impeller and the visible parts of the inlet and outlet according to the conventional scanning method; S2.2, data scanning of the invisible part of the impeller, operating the fixture to extend the probe into the invisible part of the impeller, and making the probe head of the probe contact with the working surface of the blade, and then using the 3D scanner to scan the working surface data of the invisible position closed by the blade and the front cover plate and the rear cover plate; S2.3, repeat S2.1 and S2.2 multiple times until the working surface data of the entire blade is obtained.

9. The data collection method for a closed impeller according to claim 8, It is characterized in that The data collection of the blade working surface in the above step S2 includes data collection of the top of the working surface and data collection of the bottom of the working surface. The data collection step of the top of the working surface is to operate the fixture, extend the probe into an invisible position in the impeller, and make the probe head of the probe contact the intersection of the blade and the front cover plate, and then scan the fixture position through a 3D scanner, and repeat this process multiple times until the data of the top of the entire blade working surface is collected; the data collection step of the bottom of the working surface is to operate the fixture, extend the probe into an invisible position in the impeller, and make the probe head of the probe contact the intersection of the blade and the rear cover plate, and then scan the fixture position through a 3D scanner, and repeat this process multiple times until the data of the bottom of the entire blade working surface is collected.

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