Device and method for measuring distance from impeller center to blade profile

Abstract

The invention belongs to the technical field of machining, and particularly relates to a device and method for measuring the distance from the center of an impeller to a blade profile, the device comprises a bottom plate, the bottom plate is provided with a positioning pin, a measuring unit and a meter aligning unit, a to-be-measured part is arranged on the positioning pin, the positioning pin is arranged at one end of the bottom plate, and the measuring unit is arranged at the other end of the bottom plate. The measuring unit is arranged on one side of the positioning pin and is in contact with the blade profile of the to-be-measured part, and the meter setting unit is arranged on the other side of the positioning pin; the measuring unit comprises an alignment device and a measuring rod device, and the alignment device and the measuring rod device are arranged on the bottom plate in parallel and make contact with the blade profile at the same time for measurement. A measurement method that the alignment device and the measuring rod device simultaneously use meter reading for alignment and simultaneously read measured values is adopted, so that the situation that a to-be-measured part does not reach a detection angle due to rotation and detection values of a blade profile at different positions are different is avoided, the detection position is aligned by adopting a two-point one-line principle, the accuracy of the detection position is ensured, and the measurement accuracy is improved. Measurement system errors are reduced, and measurement precision is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a device and method for measuring the distance from the center of an impeller to a blade profile. Background Art

[0002] In the machining process of impeller parts, the accuracy of the blade profile is crucial. In particular, in some applications, the distance from the blade profile to the impeller center needs to be strictly controlled to ensure the performance and quality of the impeller. For example, the structure of the impeller parts can be seen in Figure 1 , a specific process requires the distance from the blade surface to the impeller center (See Figure 1 ).

[0003] However, at the production site, there is often a lack of reliable detection methods to meet this requirement. If the impeller is sent to the metering room for testing, although accurate measurement results can be obtained, the detection efficiency is too low to meet the needs of on-site production. This will not only extend the production cycle, but also increase production costs. On the other hand, if a random inspection method is adopted, although time can be saved to a certain extent, due to the manual polishing process of the blade profile, the random inspection method cannot fully reflect the actual processing conditions of each blade profile, so there are quality risks. In order to solve the above problems, it is necessary to develop a device and method that can quickly and accurately measure the distance from the blade profile to the impeller center at the production site to ensure that each blade profile meets the process requirements and improve product quality and production efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for measuring the distance from the impeller center to the blade profile, so as to solve the technical problem that the distance from the blade profile to the impeller center cannot be measured quickly and accurately at the production site.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A device for measuring the distance from the center of an impeller to a blade profile, characterized in that it comprises a bottom plate, a positioning pin, a measuring unit and a table alignment unit are arranged on the bottom plate, a part to be measured is arranged on the positioning pin, the positioning pin is arranged at one end of the bottom plate, the measuring unit is arranged on one side of the positioning pin to contact with the blade profile of the part to be measured, and the table alignment unit is arranged on the other side of the positioning pin; The measuring unit comprises an alignment device and a measuring rod device, which are arranged in parallel on the bottom plate and contact with the blade profile surface for measurement at the same time.

[0006] Preferably, the locating pin is a step locating pin, the center hole of the part to be measured is sleeved on the upper half of the step locating pin, the impeller end face rests on the step surface of the step locating pin, and the lower half of the step locating pin is connected to the bottom plate by a hole interference fit.

[0007] Preferably, the alignment unit includes an alignment block and an alignment piece. The alignment piece is a rectangular parallelepiped. The alignment block includes a plane and a positioning surface. The plane and the positioning surface form an "L" shape. The plane is fixed on the base plate. When in use, the alignment piece is placed on the base plate and one side is in close contact with the positioning surface of the alignment block.

[0008] Preferably, the dimensions of the alignment piece and the alignment block are required to satisfy the following relationship: B-A=L Among them, B is the width of the alignment piece; A is the dimension from the locating surface of the alignment block to the center of the locating pin; L is the theoretical distance from the center of the impeller to the blade profile.

[0009] Preferably, the alignment device includes a positioning seat, which is fixed on the base plate on one side of the positioning pin, and a gauge clamp is fixed to the positioning seat, and an alignment gauge is fixed to the gauge clamp through a gauge clamp nut. A through hole is also provided on the positioning seat, and an alignment rod is slidably arranged in the through hole, one end of the alignment rod is connected to the alignment gauge, and a spring is arranged between the alignment rod and the alignment gauge.

[0010] Preferably, the measuring rod device includes a support; the support is fixed on the base plate and is located on one side of the alignment device, and a lever support and a table frame are provided on the support, a measuring table is fixed on the table frame, a lever is connected to the lever support, one end of the lever is connected to the measuring end of the measuring table, and the other end is connected to the measuring rod, and the measuring rod is slidably arranged on the alignment device.

[0011] Preferably, the lever support and the table frame are both interference fit with the support through the hole axis and are oriented with anti-rotation screws.

[0012] The second invention is a method for measuring the distance from the center of an impeller to a blade profile, using any of the above-mentioned measuring devices, the method comprising: S1: Install the alignment unit and use it to align the alignment device and the measuring rod device to zero at the same time; S2: Remove the alignment unit, set the part to be measured on the locating pin for axial positioning, rotate the part to be measured so that the blade surface contacts the alignment device and the measuring rod device at the same time, and compare the measured values ​​of the alignment device and the measuring rod device. When the absolute values ​​of the measured values ​​of the alignment device and the measuring rod device are equal, the measured value of the measuring rod device is the error value of the measured dimension.

[0013] Preferably, the alignment unit includes an alignment block and an alignment piece; and the size requirements of the alignment piece and the alignment block satisfy the following relationship: B-A=L Among them, B is the width of the alignment piece; A is the dimension from the alignment block positioning surface to the center of the positioning pin; L is the theoretical distance from the impeller center to the blade profile; The method then comprises: S1: Place the alignment piece on the alignment block, so that the alignment piece is close to the positioning surface of the alignment block, and the alignment piece contacts the alignment device and the measuring rod device at the same time, and the alignment device and the measuring rod device are zeroed at the same time; S2: Remove the alignment parts, set the part to be measured on the locating pin for axial positioning, rotate the part to be measured so that the blade surface contacts the alignment device and the measuring rod device at the same time, and compare the measured values ​​of the alignment device and the measuring rod device. When the absolute values ​​of the measured values ​​of the alignment device and the measuring rod device are equal, the measured value of the measuring rod device is the error value of the measured dimension.

[0014] Preferably, the alignment device comprises an alignment rod and an alignment table; the measuring device comprises a measuring rod and a measuring table, and the method comprises: S1: Install the meter alignment unit and use it to zero the alignment meter and the measuring meter at the same time; S2: Remove the alignment unit, set the part to be measured on the locating pin for axial positioning, rotate the part to be measured so that the blade surface contacts the alignment rod and the measuring rod at the same time, and compare the measured values ​​of the alignment table and the measuring table. When the absolute values ​​of the measured values ​​of the alignment table and the measuring table are equal, the measured value of the measuring table is the error value of the measured dimension.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present application discloses a measuring device for the distance from the center of an impeller to the blade profile. The design principle is correct, and the device is ingenious and easy to understand. The design is novel. The device adopts a measuring method that uses a calibration device and a measuring rod device to calibrate the distance with a meter reading and read the measured value at the same time, which solves the technical problem of inaccurate detection position of the rotating part to be measured. The rotation makes the part to be measured reach the detection angle. If the calibration of the detection position is not set, it is easy to not rotate to a fixed angle or position, so that the blade profile has different detection values ​​at different positions. The present application adopts the principle of two points and one line to align the detection position, which ensures the accuracy of the detection position, reduces the error of the measurement system, and improves the measurement accuracy. The device is composed of a positioning pin, a measuring unit and a table alignment unit. The measuring unit realizes the calibration and measurement functions, and the layout is clear, reasonable and compact. The device of the invention is easy to manufacture and detect, and the cost is low. It has been verified by the use of the production site that the measurement is stable and reliable, and the operation is convenient, which ensures the reliable inspection of the distance from the blade profile of the impeller part to the center of the impeller, greatly improves the measurement efficiency, and solves the measurement problem that the impeller parts at the production site are sent to the metering room for detection due to the lack of measurement means and the low efficiency affects the delivery of products. The overall design of the invention device reflects the ingenuity of the inventor. The design principle, method and device of this invention have certain promotional value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 Schematic diagram of the parts structure of the prior art; wherein (a) is the main view and (b) is the top view; Figure 2 A top view of the device of the present invention; Figure 3 It is a front view of the device of the present invention.

[0018] Among them: 1-base plate; 2-locating pin; 3-aligning rod; 4-spring; 5-locating seat; 6-meter clamp; 7-meter clamp nut; 8-meter frame; 9-lever; 10-lever support; 11-spring; 12-cylindrical pin; 13-anti-rotation screw; 14-support; 15-measuring rod; 16-meter block; 17-meter parts; 18-impeller center; 19-blade profile; 20-aligning table; 21-measuring table. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0022] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0023] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings: See also Figure 2 The present application discloses a device for measuring the distance from the center of an impeller to a blade profile, comprising a base plate 1, a positioning pin 2, a measuring unit and a table alignment unit are arranged on the base plate 1, a part to be measured is arranged on the positioning pin 2, the positioning pin 2 is arranged at one end of the base plate 1, the measuring unit is arranged on one side of the positioning pin 2 to contact with the blade profile 19 of the part to be measured, and the table alignment unit is arranged on the other side of the positioning pin 2; The measuring unit includes an alignment device and a measuring rod device, which are arranged in parallel on the bottom plate 1 and are in contact with the blade profile 19 for measurement. The alignment device and the measuring rod device are used to align the two-point dash line principle at the same time. During measurement, the measurement values ​​of the alignment device and the measuring rod device are read simultaneously to ensure the accuracy of the detection position and avoid the blade profile being detected without accurately reaching the detection position (rotating the part to be measured to make the part to be measured reach the detection angle. If the alignment of the detection position is not set, it is easy to fail to rotate to a fixed angle or position, so that the blade profile has different detection values ​​at different positions. The present application adopts the principle of two points and one line to align the detection position, which ensures the accuracy of the detection position), reduce the measurement system error, and improve the measurement accuracy.

[0026] In some embodiments, the positioning pin 2 is a stepped positioning pin, the center hole of the part to be tested is sleeved on the upper half of the stepped positioning pin, the end face of the impeller rests on the stepped surface of the stepped positioning pin, and the lower half of the stepped positioning pin is connected to the bottom plate 1 by a hole interference fit. The axial positioning of the part to be tested is achieved without affecting its rotation, which facilitates the detection of each blade profile 19.

[0027] In some embodiments, the alignment unit includes an alignment block 16 and an alignment piece 17. The alignment piece 17 is a rectangular parallelepiped. The alignment block 16 includes a plane and a positioning surface. The plane and the positioning surface form an "L" shape. The plane is fixed on the base plate 1. When in use, the alignment piece 17 is placed on the base plate 1 and one side is in close contact with the positioning surface of the alignment block 16.

[0028] Further preferably, the dimensions of the alignment member 17 and the alignment block 16 are required to satisfy the following relationship: B-A=L Among them, B is the width of the alignment piece 17; A is the dimension from the positioning surface of the alignment block 16 to the center of the positioning pin 2; L is the theoretical distance from the impeller center 18 to the blade profile 19. The alignment principle is correct and the implementation is simple and easy. Replacing the alignment pieces 17 of different sizes can meet the measurement requirements of different sizes, and the applicability is high.

[0029] In some embodiments, the alignment device includes a positioning seat 5, which is fixed on the bottom plate 1 and located on one side of the positioning pin 2. A meter clamp 6 is fixed to the positioning seat 5, and an alignment meter 20 is fixed to the meter clamp 6 through a meter clamp nut 7. A through hole is also provided on the positioning seat 5, and an alignment rod 3 is slidably arranged in the through hole. One end of the alignment rod 3 is connected to the alignment meter 20, and a spring 4 is arranged between the alignment rod 3 and the alignment meter 20. The spring 4 ensures that the alignment rod 3 can be closely attached to the blade profile 19 to ensure the accuracy of the detection.

[0030] In some embodiments, the measuring rod device includes a support 14; the support 14 is fixed on the bottom plate 1 and is located on one side of the alignment device, and a lever support 10 and a table frame 8 are provided on the support 14, a measuring table 21 is fixed on the table frame 8, a lever 9 is connected to the lever support 10, one end of the lever 9 is connected to the measuring end of the measuring table 21, and the other end is connected to a measuring rod 15, and the measuring rod 15 is slidably arranged on the alignment device. The measuring rod 15 and the alignment measuring rod 3 simultaneously contact the table member 17 and the blade profile 19, and use the two-point one-line principle to locate the plane, align the detection position, and ensure the accuracy of the detection.

[0031] In some embodiments, the lever support 10 and the watch frame 8 are both interference fit with the support 14 through the hole axis and are oriented with the anti-rotation screw 13.

[0032] The present invention also discloses a method for measuring the distance from the center of an impeller to a blade profile, using any one of the above-mentioned measuring devices, the method comprising: S1: Install the alignment unit and use it to align the alignment device and the measuring rod device to zero at the same time; S2: Remove the alignment unit, set the part to be measured on the positioning pin 2 for axial positioning, rotate the part to be measured so that the blade surface contacts the alignment device and the measuring rod device at the same time, and compare the measurement values ​​of the alignment device and the measuring rod device. When the absolute values ​​of the measurement values ​​of the alignment device and the measuring rod device are equal, the measurement value of the measuring rod device is the error value of the measured dimension.

[0033] In some embodiments, the alignment unit includes an alignment block 16 and an alignment member 17; and the size requirements of the alignment member 17 and the alignment block 16 satisfy the following relationship: B-A=L Wherein, B is the width of the alignment piece 17; A is the dimension from the positioning surface of the alignment block 16 to the center of the positioning pin 2; L is the theoretical distance from the impeller center 18 to the blade profile 19; The method then comprises: S1: Place the alignment piece 17 on the alignment block 16, so that the alignment piece 17 is in close contact with the positioning surface of the alignment block 16, and the alignment piece 17 contacts the alignment device and the measuring rod device at the same time, and the alignment device and the measuring rod device are zeroed at the same time; S2: Remove the alignment piece 17, set the part to be measured on the positioning pin 2 for axial positioning, rotate the part to be measured so that the blade surface contacts the alignment device and the measuring rod device at the same time, and compare the measurement values ​​of the alignment device and the measuring rod device. When the absolute values ​​of the measurement values ​​of the alignment device and the measuring rod device are equal, the measurement value of the measuring rod device is the error value of the measured dimension.

[0034] In some embodiments, the alignment device includes an alignment rod 3 and an alignment table 20; the measuring device includes a measuring rod 15 and a measuring table 21, and the method includes: S1: Install the meter alignment unit, and use the meter alignment unit to zero the alignment meter 20 and the measuring meter 21 at the same time; S2: Remove the alignment piece 17, set the part to be measured on the locating pin 2 for axial positioning, rotate the part to be measured so that the blade profile 19 contacts the alignment measuring rod 3 and the measuring rod 15 at the same time, and compare the measured values ​​of the alignment table 20 and the measuring table 21. When the absolute values ​​of the measured values ​​of the alignment table 20 and the measuring table 21 are equal, the measured value of the measuring table 21 is the error value of the measured dimension.

[0035] In some embodiments, a method for measuring the distance from the center of an impeller to a blade profile includes: S1: Place the alignment piece 17 on the alignment block 16, so that the alignment piece 17 is close to the positioning surface of the alignment block 16, and the alignment piece 17 contacts the alignment rod 3 and the measuring rod 15 at the same time, and the alignment table 20 and the measuring table 21 are zeroed at the same time; S2: Remove the alignment piece 17, set the part to be measured on the locating pin 2 for axial positioning, rotate the part to be measured so that the blade profile 19 contacts the alignment measuring rod 3 and the measuring rod 15 at the same time, and compare the measured values ​​of the alignment table 20 and the measuring table 21. When the absolute values ​​of the measured values ​​of the alignment table 20 and the measuring table 21 are equal, the measured value of the measuring table 21 is the error value of the measured dimension.

[0036] [Example] The measuring device disclosed in the present application is composed of a positioning pin 2, a measuring unit and a table alignment unit. The measuring unit is composed of a alignment device and a measuring rod device.

[0037] (1) Positioning pin 2 The center hole of the impeller part is positioned by the clearance fit of the locating pin 2. The clearance size is mainly determined by the tolerance of the measured size. The clearance fit is as small as possible when the machining accuracy is easy to ensure, so as to obtain higher measurement accuracy. The end face of the impeller rests on the end face of the locating pin 2. The locating pin 2 is a step locating pin, which is connected to the bottom plate 1 by a hole-shaft interference fit.

[0038] (2) Measurement unit a) Alignment device The alignment rod 3, spring 4, gauge clamp 6 and gauge clamp nut 7 form an alignment device. The alignment device is installed in the positioning seat 5. The alignment rod 3 and the positioning seat 5 are matched through a small gap between the hole and the axis, and the alignment rod 3 slides freely in the positioning seat 5; the gauge clamp 6 is fixed in the positioning seat 5 through a threaded connection; the spring 4 ensures that the alignment rod 3 is tightly attached to the measured blade profile. The positioning seat 5 is connected to the base plate 1 through screws and cylindrical pins.

[0039] b) Measuring rod device The measuring rod 15, lever 9, lever support 10, cylindrical pin 12, spring 11, meter frame 8 and support 14 constitute the measuring rod device. The measuring rod 15 and the positioning seat 5 are matched through a small clearance between the hole and the axis, and the measuring rod 15 is ensured to slide freely in the positioning seat 5; the lever 9 and the lever support 10 are connected through a cylindrical pin to ensure that the lever 9 can rotate freely; the lever support 10 and the meter frame 8 are both matched with the support 14 through an interference fit between the hole and the axis and are oriented with an anti-rotation screw 13. The support 14 is connected to the base plate 1 through screws and cylindrical pins.

[0040] Alignment Unit The meter alignment unit is composed of a meter alignment block 16 and a meter alignment member 17. The meter alignment block 16 is an L-shaped structure, connected to the base plate 1 by screws and cylindrical pins; the meter alignment member 17 is a rectangular parallelepiped structure. Figure 2 Medium design size 21 minus Figure 2The design dimension 20 is the measured dimension 1. That is, when the measured dimension of the impeller part is L, the dimension design of the locating pin 2 to the locating surface of the alignment block 16 in the measuring device is given as A, and the alignment dimension design of the alignment piece 17 is given as B, which needs to satisfy the relationship: B-A=L; in this embodiment, L is , meeting specific process requirements of the distance from the blade surface to the impeller center.

[0041] How to use the special measuring device: 1) Before measuring the impeller parts, first place the alignment piece 17 on the base plate 1 and make it close to the positioning surface of the alignment block 16. At this time, the alignment rod 3 and the measuring rod 15 are in contact with the alignment piece 17. At the same time, the alignment gauge 1 is zeroed and the measuring gauge 21 is zeroed.

[0042] 2) Remove the alignment part 17, install the impeller part to be measured and position it axially, rotate the impeller part so that the blade profile contacts the alignment rod 3 and the measuring rod 15 at the same time, and the alignment table 1 and the measuring table 2 display the readings. When the absolute values ​​of the readings displayed on the alignment table 1 and the measuring table 2 are equal, record the reading value of the measuring table 2 at this time. This reading value is the error value of the measured dimension, and the actual value from the impeller profile to the impeller center can be calculated. If it is within the tolerance range of the measured dimension, the measured dimension is qualified.

[0043] In summary, the design principle of the device disclosed in this application is correct, ingenious and easy to understand, with novel conception. The alignment rod and the measuring rod are used to align with the meter reading (two-point dash line principle) and read the measurement value at the same time, which ensures the accuracy of the detection position, reduces the measurement system error, and improves the measurement accuracy; the design of the table size B of the table piece satisfies the relationship: B-A=L, the table principle is correct and the implementation is simple and easy. The structural design is a mechanical structure, which consists of a positioning part, a measuring part and a table part. The measuring part realizes the alignment and measurement functions, with a clear layout and reasonable compactness. This invention device is easy to manufacture and detect, and has low cost. It has been verified by the use of the production site that the measurement is stable and reliable, and the operation is convenient, which ensures the reliable inspection of the distance from the blade surface of the impeller part to the center of the impeller, greatly improves the measurement efficiency, and solves the measurement problem of the impeller parts in the production site being sent to the metering room for detection due to the lack of measurement means and low efficiency affecting product delivery. The overall design of the invention device reflects the ingenuity of the inventor. The design principle, method and device of this invention have certain promotional significance.

[0044] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for measuring the distance from the center of an impeller to the blade profile, characterized in that: The device comprises a base plate (1), a positioning pin (2), a measuring unit and a table alignment unit being arranged on the base plate (1), a part to be measured being arranged on the positioning pin (2), the positioning pin (2) being arranged at one end of the base plate (1), the measuring unit being arranged on one side of the positioning pin (2) and contacting with a blade profile (19) of the part to be measured, and the table alignment unit being arranged on the other side of the positioning pin (2); The measuring unit comprises an alignment device and a measuring rod device, wherein the alignment device and the measuring rod device are arranged in parallel on the base plate (1) and are in contact with the blade profile (19) for measurement.

2. A device for measuring the distance from the impeller center to the blade profile according to claim 1, characterized in that: The positioning pin (2) is a stepped positioning pin, the center hole of the part to be measured is sleeved on the upper half of the stepped positioning pin, the end face of the impeller rests on the step surface of the stepped positioning pin, and the lower half of the stepped positioning pin is connected to the bottom plate (1) by means of a hole interference fit.

3. A device for measuring the distance from the impeller center to the blade profile according to claim 1, characterized in that: The alignment unit comprises an alignment block (16) and an alignment member (17); the alignment member (17) is a rectangular parallelepiped; the alignment block (16) comprises a plane and a positioning surface; the plane and the positioning surface form an "L" shape; the plane is fixed on the bottom plate (1); when in use, the alignment member (17) is placed on the bottom plate (1) with one surface in close contact with the positioning surface of the alignment block (16).

4. The device for measuring the distance from the impeller center to the blade profile according to claim 3, characterized in that: The dimensions of the alignment member (17) and the alignment block (16) are required to satisfy the following relationship: B-A=L Wherein, B is the width of the alignment piece (17); A is the dimension from the positioning surface of the alignment block (16) to the center of the positioning pin (2); and L is the theoretical distance from the center of the impeller (18) to the blade profile (19).

5. The device for measuring the distance from the impeller center to the blade profile according to claim 1, characterized in that: The alignment device comprises a positioning seat (5), the positioning seat (5) being fixed on the bottom plate (1) and located on one side of the positioning pin (2), a gauge clamp (6) being fixedly connected to the positioning seat (5), an alignment gauge (20) being fixed to the gauge clamp (6) via a gauge clamp nut (7), a through hole being further provided on the positioning seat (5), an alignment measuring rod (3) being slidably arranged in the through hole, one end of the alignment measuring rod (3) being connected to the alignment gauge (20), and a spring (4) being arranged between the alignment measuring rod (3) and the alignment gauge (20).

6. A device for measuring the distance from the impeller center to the blade profile according to claim 1, characterized in that: The measuring rod device comprises a support (14); the support (14) is fixed on the bottom plate (1) and is located on one side of the alignment device; a lever support (10) and a table frame (8) are provided on the support (14); a measuring table (21) is fixed on the table frame (8); a lever (9) is connected to the lever support (10); one end of the lever (9) is connected to the measuring end of the measuring table (21); the other end of the lever (9) is connected to the measuring rod (15); and the measuring rod (15) is slidably arranged on the alignment device.

7. A device for measuring the distance from the impeller center to the blade profile according to claim 6, characterized in that: The lever support (10) and the table frame (8) are both fitted with the support (14) through a hole-shaft interference fit and are oriented with an anti-rotation screw (13).

8. A method for measuring the distance from the center of an impeller to the blade profile, characterized in that: Using the measuring device according to any one of claims 1 to 7, the method comprises: S1: Install the alignment unit and use it to align the alignment device and the measuring rod device to zero at the same time; S2: Remove the alignment unit, set the part to be measured on the positioning pin (2) for axial positioning, rotate the part to be measured so that the blade profile contacts the alignment device and the measuring rod device at the same time, and compare the measured values ​​of the alignment device and the measuring rod device. When the absolute values ​​of the measured values ​​of the alignment device and the measuring rod device are equal, the measured value of the measuring rod device is the error value of the measured dimension.

9. A method for measuring the distance from the impeller center to the blade profile according to claim 8, characterized in that: The alignment unit comprises an alignment block (16) and an alignment member (17); and the dimensions of the alignment member (17) and the alignment block (16) are required to satisfy the following relationship: B-A=L Wherein, B is the width of the alignment piece (17); A is the dimension from the positioning surface of the alignment block (16) to the center of the positioning pin (2); and L is the theoretical distance from the center of the impeller (18) to the blade profile (19); The method then comprises: S1: Installing the alignment piece (17) on the alignment block (16) so that the alignment piece (17) is in close contact with the positioning surface of the alignment block (16), the alignment piece (17) contacts the alignment device and the measuring rod device at the same time, and the alignment device and the measuring rod device are zeroed at the same time; S2: Remove the alignment piece (17), set the part to be measured on the positioning pin (2) for axial positioning, rotate the part to be measured so that the blade profile contacts the alignment device and the measuring rod device at the same time, and compare the measurement values ​​of the alignment device and the measuring rod device. When the absolute values ​​of the measurement values ​​of the alignment device and the measuring rod device are equal, the measurement value of the measuring rod device is the error value of the measured dimension.

10. A method for measuring the distance from the impeller center to the blade profile according to claim 8, characterized in that: The alignment device comprises an alignment rod (3) and an alignment table (20); the measuring device comprises a measuring rod (15) and a measuring table (21), and the method comprises: S1: Install the alignment unit and use the alignment unit to align the alignment meter (20) and the measuring meter (21) to zero simultaneously; S2: Remove the alignment unit, set the part to be measured on the positioning pin (2) for axial positioning, rotate the part to be measured so that the blade profile (19) contacts the alignment rod (3) and the measuring rod (15) at the same time, and compare the measured values ​​of the alignment table (20) and the measuring table (21). When the absolute values ​​of the measured values ​​of the alignment table (20) and the measuring table (21) are equal, the measured value of the measuring table (21) is the error value of the measured dimension.

Images