Energy storage compressor center measurement method based on laser tracker

Abstract

A laser tracker-based method for center measurement of energy storage compressors relates to the field of energy storage compressor assembly and testing technology. The invention includes the following steps: Step 1: After the base frame, housing, front bearing housing, and rear bearing housing are in place, the laser tracker is positioned to the side and rear of the rear bearing housing. The height and pitch angle of the laser tracker are adjusted so that the laser beam can cover the outermost measuring point of the rear bearing housing without obstruction. The laser tracker's placement and observation angle are determined first. A pre-processing optical path reachability analysis is performed, and obstructed measuring points are collected in advance to eliminate measurement blind spots. A unified global coordinate system is constructed using the housing. Then, the bearing housing, multi-stage partitions, and front and rear steam seals are installed in stages, with simultaneous three-dimensional measurement and real-time fine-tuning. This eliminates the need for pre-reserved space for dummy shaft brackets within the unit, adapting to the compact structure and narrow internal flow conditions of energy storage compressors, resulting in more accurate measurement data.

Description

Technical Field

[0001] This invention relates to the field of energy storage compressor assembly and testing technology, specifically to a method for measuring the center of an energy storage compressor based on a laser tracker. Background Technology

[0002] The multi-working-medium compressor for energy storage is the core power equipment of the energy storage system. The unit is assembled in series with multiple components such as the casing, front and rear bearing housings, multi-stage partitions, and front and rear steam seals. During the assembly process, the coaxiality of the center of each component directly determines the unit's operating vibration, noise, and sealing performance. It is a key control indicator in the final assembly of the unit. Therefore, the center position detection and alignment adjustment of each component must be accurately completed during the assembly stage.

[0003] Currently, the dummy shaft measurement method is commonly used to test the coaxiality of the compressor center. This process relies on a standard dummy shaft that runs through the unit to simulate the rotor reference, and uses an inner diameter measuring tool to measure the clearance between the dummy shaft and the inner hole of each component, thereby determining the center offset of each component.

[0004] However, the installation and fixation of the dummy shaft relies on a dedicated dummy shaft bracket for support and positioning. The overall structure of the energy storage multi-working-refrigerant compressor is highly compact, and the internal space of the unit casing and the flow space of each stage are small. There is no reserved space to place the dummy shaft bracket, so the dummy shaft cannot be stably centered and fixed. The measurement reference is prone to shift, resulting in distorted measurement data. Summary of the Invention

[0005] The purpose of this invention is to solve the problem that the lack of reserved space inside the unit casing for placing a dummy shaft support leads to a misalignment of the measurement reference, resulting in distorted measurement data. Therefore, this invention provides a method for measuring the center of an energy storage compressor based on a laser tracker.

[0006] The technical solution of the present invention is: a method for measuring the center of an energy storage compressor based on a laser tracker, comprising the following steps: Step 1: On the basis that the base frame, housing, front bearing housing and rear bearing housing have been completed and positioned, the laser tracker is arranged on the side and rear of the rear bearing housing, and the height and pitch angle of the laser tracker are adjusted so that the laser beam can cover the outermost measuring point of the rear bearing housing without obstruction.

[0007] Step 2: Before assembly, conduct laser optical path accessibility analysis based on the unit structure drawings, draw the theoretical connection between the laser tracker and each measuring point, identify the laser obstruction areas caused by each stage of diaphragm, front steam seal, and rear steam seal, and establish a measuring point accessibility matrix;

[0008] Step 3: The process of collecting data at the obscured measurement points is moved forward to before the assembly of the obstructing components to eliminate measurement blind spots;

[0009] Step 4: With the diaphragms, front steam seals, and rear steam seals of the unit not assembled, first measure the measuring points on the shell, and at the same time supplement the measurement of the horizontal mid-section and end face features of the shell, and construct a global coordinate system Σ0 with the geometric center of the shell as the origin;

[0010] Step 5: Assemble the front and rear bearing housings in sequence, and collect the measurement points, split surface, and end face feature data of the front and rear bearing housings respectively. Import the coordinates of the measurement points into the global coordinate system Σ0, calculate the three-dimensional offset of the center of the front and rear bearing housings relative to the housing reference center in the X, Y, and Z directions, and fine-tune the installation position of the bearing housings according to the offset to ensure that the coincidence of the bearing housing center with the housing reference center meets the design requirements.

[0011] Step 6: Install multiple levels of partitions in sequence. Immediately after assembling each level of partition, collect the coordinates of the corresponding measuring points and fit the three-dimensional offset of the center of the partition relative to the global coordinate system Σ0. Before assembling the next level of partition, complete the fine adjustment of the center of the current level of partition.

[0012] Step 7: Assemble the front and rear steam seals, collect the coordinates of the steam seal measuring points, calculate the three-dimensional offset of the steam seal center relative to the global coordinate system Σ0, and perform final fine-tuning.

[0013] Furthermore, the laser obstruction area caused by the front steam seal in step two includes measuring point 1 and measuring point 2 of the front bearing housing and measuring point 3 of the housing.

[0014] Furthermore, the laser blocking area caused by the secondary partition in step two includes the measuring point 6 of the primary partition;

[0015] The laser blocking area caused by the third-level partition includes measuring point 7 of the second-level partition;

[0016] The laser blocking area caused by the fourth-level partition includes the measuring point 8 of the third-level partition;

[0017] The laser blocking area caused by the level 5 septum includes measuring point 9 of the level 4 septum.

[0018] Furthermore, in step six, the multi-level partitions are installed and measured in a graded and progressive manner. First, the sixth-level partition is installed and measuring point 11 is measured. Then, the first-level partition, the second-level partition, the third-level partition, the fourth-level partition, and the fifth-level partition are installed in sequence. After each level of partition is installed, the corresponding measuring points 6, 7, 8, 9, and 10 are measured immediately.

[0019] Furthermore, the laser obstruction area caused by the rear steam seal in step two includes measuring point 10 of the fifth-level diaphragm and measuring point 11 of the sixth-level diaphragm.

[0020] Furthermore, the shell reference measurement points used in step four to construct the global coordinate system Σ0 include measurement points 3 and 14 located at both ends of the shell.

[0021] Furthermore, in step one, the outermost measuring point of the rear bearing housing is measuring point 16, and the top-down angle of the laser tracker must completely cover measuring point 16 without obstruction.

[0022] Furthermore, in step five, the measuring points for the front bearing housing include measuring point 1 and measuring point 2, and the measuring points for the rear bearing housing include measuring point 15 and measuring point 16.

[0023] Furthermore, the distance between the laser tracker and the measuring point 1 of the front bearing housing is controlled so that the measurement accuracy after the instrument's cumulative working accuracy calculation is no greater than 0.02mm.

[0024] Furthermore, in step seven, the measuring points for the front steam seal include measuring points 4 and 5, and the measuring points for the rear steam seal include measuring points 12 and 13.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] 1. The energy storage compressor center measurement method based on laser tracker provided by this invention first determines the laser tracker's deployment position and observation angle, performs pre-optical path reachability analysis and collects obstructed measurement points in advance to eliminate measurement blind spots, constructs a unified global coordinate system with the shell, and then installs the bearing box, multi-stage partitions, and front and rear steam seals in stages, and performs simultaneous three-dimensional measurement and real-time fine adjustment. It does not require the reserved space for dummy shaft brackets inside the unit, and is suitable for the compact structure and narrow internal flow conditions of energy storage compressors, resulting in more accurate measurement data. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0028] In the diagram: 1. Base frame; 2. Housing; 3. Front bearing housing; 4. Rear bearing housing; 5. Laser tracker; 6. Front steam seal; 7. Rear steam seal; 8. Primary diaphragm; 9. Secondary diaphragm; 10. Tertiary diaphragm; 11. Quaternary diaphragm; 12. Fifth diaphragm; 13. Sixth diaphragm. Detailed Implementation

[0029] Specific implementation method one: Combining Figure 1 This embodiment is described, and includes the following steps: Step 1: After the base frame 1, housing 2, front bearing housing 3 and rear bearing housing 4 have been completed and positioned, the laser tracker 5 is placed behind the rear bearing housing 4. The height and pitch angle of the laser tracker 5 are adjusted so that the laser beam can cover the outermost measuring point of the rear bearing housing 4 without obstruction.

[0030] Step 2: Before assembly, conduct laser optical path accessibility analysis based on the unit structure drawings, draw the theoretical connection between the laser tracker 5 and each measuring point, identify the laser blocking areas caused by each level of partition, front steam seal 6, and rear steam seal 7, and establish the measuring point accessibility matrix;

[0031] Step 3: The process of collecting data at the obscured measurement points is moved forward to before the assembly of the obstructing components to eliminate measurement blind spots;

[0032] Step 4: With the diaphragms, front steam seal 6, and rear steam seal 7 of the unit not assembled, first measure the measuring points on the shell 2, and at the same time supplement the measurement of the horizontal mid-plane and end face features of the shell 2, and construct a global coordinate system Σ0 with the geometric center of the shell 2 as the origin;

[0033] Step 5: Assemble the front bearing housing 3 and the rear bearing housing 4 in sequence, and collect the measurement points, mid-plane and end-face feature data of the front bearing housing 3 and the rear bearing housing 4 respectively. Import the coordinates of the measurement points into the global coordinate system Σ0, calculate the three-dimensional offset of the center of the front bearing and the rear bearing housing 4 relative to the reference center of the housing 2 in the X, Y and Z directions, and fine-tune the installation position of the bearing housing according to the offset to make the coincidence of the bearing housing center and the reference center of the housing 2 meet the design requirements.

[0034] Step 6: Install multiple partitions in sequence. Immediately after each partition 8 is assembled, collect the coordinates of the corresponding measuring points and fit the three-dimensional offset of the center of the partition relative to the global coordinate system Σ0. Before assembling the next partition 8, complete the fine adjustment of the center of the current partition.

[0035] Step 7: Assemble the front steam seal 6 and the rear steam seal 7, collect the coordinates of the steam seal measuring points, calculate the three-dimensional offset of the steam seal center relative to the global coordinate system Σ0, and perform final fine-tuning.

[0036] The energy storage compressor center measurement method based on laser tracker 5 in this embodiment first determines the deployment position and observation angle of laser tracker 5, performs pre-optical path reachability analysis and collects obstructed measurement points in advance to eliminate measurement blind spots, constructs a unified global coordinate system with shell 2, and then installs the bearing box, multi-stage partitions, and front and rear steam seals 7 in stages, and performs simultaneous three-dimensional measurement and real-time fine adjustment. It does not require the reserved space for dummy shaft bracket installation inside the unit, and is suitable for the compact structure and narrow internal flow of energy storage compressor, resulting in more accurate measurement data.

[0037] Specific Implementation Method Two: Combining Figure 1 This embodiment differs from Specific Embodiment 1 in that the laser obstruction area caused by the front steam seal 6 in step two includes measurement points 1 and 2 of the front bearing housing 3 and measurement point 3 of the housing 2. This establishes a clear correspondence between the obstructed optical path and the corresponding measurement points, allowing for rapid identification of the blind zone measurement points corresponding to the front steam seal 6 during the initial optical path reachability analysis phase. This prevents the inability to collect reference measurement points from the front bearing housing 3 and housing 2 after assembling the front steam seal 6, thus avoiding reference loss. Other components and connections are the same as in Specific Embodiment 1.

[0038] Specific implementation method three: Combining Figure 1This embodiment differs from Specific Embodiment 1 in that, in step two, the laser obstruction area caused by the secondary partition 9 includes measuring point 6 of the primary partition 8; the laser obstruction area caused by the tertiary partition 10 includes measuring point 7 of the secondary partition 9; the laser obstruction area caused by the quaternary partition 11 includes measuring point 8 of the tertiary partition 10; and the laser obstruction area caused by the quinary partition 12 includes measuring point 9 of the quaternary partition 11. This avoids the problems of measuring points being obstructed and unable to be remeasured after partition assembly, and the lack of original coordinates for partition center fitting, providing complete hierarchical measuring point data support for subsequent calculation of the three-dimensional offset of the partition center. Other components and connections are the same as in Specific Embodiment 1.

[0039] Specific implementation method four: Combination Figure 1 This embodiment differs from Specific Embodiment Three in that the multi-level partitions in step six are installed and measured using a graded, progressive method. First, the sixth-level partition 13 is installed and measuring point 11 is measured. Then, the first-level partition 8, second-level partition 9, third-level partition 10, fourth-level partition 11, and fifth-level partition 12 are installed sequentially. Immediately after each level of partition 8 is installed, the corresponding measuring points 6, 7, 8, 9, and 10 are measured. This graded, progressive assembly and measurement-by-level approach allows for immediate center fitting and fine-tuning after each level of partition assembly, promptly eliminating single-level errors. This avoids the accumulation of large coaxial deviations that are difficult to correct after all multi-level partitions are assembled, significantly reducing the difficulty of overall partition coaxiality correction, improving the coaxial consistency of each level of partition, preventing mutual interference between partitions, and ensuring accurate measurement of each level's measuring points. Other components and connections are the same as in Specific Embodiment Three.

[0040] Specific Implementation Method Five: Combining Figure 1 This embodiment differs from Specific Embodiment 1 in that the laser obstruction area caused by the rear steam seal 7 in step two includes measuring point 10 of the fifth-level diaphragm 12 and measuring point 11 of the sixth-level diaphragm 13. If the inner diaphragm measuring points are not collected in advance, the laser cannot penetrate the structure of the rear steam seal 7 to measure the innermost diaphragm after assembly. This will result in the lack of reference coordinates for the two diaphragms at the end of the unit, making it impossible to complete the coaxial calibration of all flow passage components of the unit. Other components and connections are the same as in Specific Embodiment 1.

[0041] Specific Implementation Method Six: Combination Figure 1 This embodiment differs from Specific Embodiment 1 in that the reference measuring points used to construct the global coordinate system Σ0 in step four include measuring points 3 and 14 located at both ends of the housing 2. This unifies the coordinates of all components, including the bearing housing, partition, and steam seal, to the original reference of the housing 2, eliminating coordinate transformation errors caused by establishing separate coordinate systems for multiple components. Other components and connections are the same as in Specific Embodiment 3.

[0042] Specific implementation method seven: Combining Figure 1 This embodiment differs from Specific Embodiment Six in that, in step one, the outermost measuring point of the rear bearing housing 4 is measuring point 16. The upward angle of the laser tracker 5 must completely cover measuring point 16 without obstruction. By limiting the angle of the tracker to cover this measuring point, it is ensured that the coordinates of the end measuring point of the rear bearing housing 4 can be stably collected both during the initial and post-assembly stages, and the reference data of the rear bearing housing 4 will not be lost due to insufficient pitch angle of the tracker. Other components and connections are the same as in Specific Embodiment Six.

[0043] Specific implementation method eight: Combination Figure 1 This embodiment differs from Specific Embodiment 1 in that, in step five, the measuring points of the front bearing housing 3 include measuring points 1 and 2, while the measuring points of the rear bearing housing 4 include measuring points 15 and 16. By independently classifying the measuring points of the two types of bearing housings, the measurement point data of the front and rear bearing housings 4 can be quickly distinguished during the optical path analysis, data acquisition, and coordinate calculation stages, avoiding errors in offset calculation caused by confusion between the two types of bearing measuring points. Other components and connections are the same as in Specific Embodiment 1.

[0044] Specific Implementation Method Nine: Combining Figure 1 This embodiment differs from specific embodiment eight in that it controls the distance between the laser tracker 5 and the measuring point 1 of the front bearing housing 3, ensuring that the measurement accuracy, calculated by the instrument's cumulative working accuracy, is no greater than 0.02mm. By controlling the distance between the measuring points to constrain the measurement error of the laser tracker 5, the accuracy of the original coordinate acquisition is controlled at the hardware layout level, reducing the measurement error of the measuring point coordinates themselves, and ensuring that the calculation results of the center offset of each component are accurate and reliable. Other components and connections are the same as in specific embodiment eight.

[0045] Specific Implementation Method Ten: Combining Figure 1 This embodiment differs from Specific Embodiment 1 in that, in step seven, the measuring points for the front steam seal 6 include measuring points 4 and 5, and the measuring points for the rear steam seal 7 include measuring points 12 and 13. By separately classifying the measuring points for the front and rear steam seals 7, the seal-specific coordinate data can be quickly extracted during the steam seal assembly measurement process, distinguishing it from the measuring point data for the housing 2, bearing housing, and partition. The centers of the front and rear steam seals 7 can be fitted separately, and their offsets in the global coordinate system can be calculated. Other components and connections are the same as in Specific Embodiment 1.

[0046] The scope of this invention is not limited to the above-described embodiments; a combination of one or more specific embodiments can also achieve the purpose of the invention.

Claims

1. A method for measuring the center of an energy storage compressor based on a laser tracker, characterized in that, Includes the following steps: Step 1: After the base frame, housing, front bearing housing and rear bearing housing have been completed and positioned, place the laser tracker behind the rear bearing housing and adjust the height and pitch angle of the laser tracker so that the laser beam can cover the outermost measuring point of the rear bearing housing without obstruction. Step 2: Before assembly, conduct laser optical path accessibility analysis based on the unit structure drawings, draw the theoretical connection between the laser tracker and each measuring point, identify the laser obstruction areas caused by each stage of diaphragm, front steam seal, and rear steam seal, and establish a measuring point accessibility matrix; Step 3: The process of collecting data at the obscured measurement points is moved forward to before the assembly of the obstructing components to eliminate measurement blind spots; Step 4: With the diaphragms, front steam seals and rear steam seals of the unit not assembled, first measure the measuring points on the shell, and at the same time supplement the measurement of the horizontal mid-section and end face features of the shell, and construct a global coordinate system Σ0 with the geometric center of the shell as the origin; Step 5: Assemble the front and rear bearing housings in sequence, and collect the measurement points, split surface, and end face feature data of the front and rear bearing housings respectively. Import the coordinates of the measurement points into the global coordinate system Σ0, calculate the three-dimensional offset of the center of the front and rear bearing housings relative to the housing reference center in the X, Y, and Z directions, and fine-tune the installation position of the bearing housings according to the offset to ensure that the coincidence of the bearing housing center with the housing reference center meets the design requirements. Step 6: Install multiple levels of partitions in sequence. Immediately after assembling each level of partition, collect the coordinates of the corresponding measuring points and fit the three-dimensional offset of the center of the partition relative to the global coordinate system Σ0. Before assembling the next level of partition, complete the fine adjustment of the center of the current level of partition. Step 7: Assemble the front and rear steam seals, collect the coordinates of the steam seal measuring points, calculate the three-dimensional offset of the steam seal center relative to the global coordinate system Σ0, and perform final fine-tuning.

2. The method for measuring the center of an energy storage compressor based on a laser tracker according to claim 1, characterized in that, The laser obstruction area caused by the front steam seal in step two includes measuring points 1 and 2 of the front bearing housing and measuring point 3 of the housing.

3. The method for measuring the center of an energy storage compressor based on a laser tracker according to claim 1, characterized in that, The laser blocking area caused by the secondary partition in step two includes measuring point 6 of the primary partition; The laser blocking area caused by the third-level partition includes measuring point 7 of the second-level partition; The laser blocking area caused by the fourth-level partition includes the measuring point 8 of the third-level partition; The laser blocking area caused by the level 5 septum includes measuring point 9 of the level 4 septum.

4. The method for measuring the center of an energy storage compressor based on a laser tracker according to claim 3, characterized in that, In step six, the multi-level partitions are installed and measured in a progressive manner. First, the sixth-level partition is installed and measuring point 11 is measured. Then, the first-level partition, second-level partition, third-level partition, fourth-level partition, and fifth-level partition are installed in sequence. After each level of partition is installed, the corresponding measuring points 6, 7, 8, 9, and 10 are measured immediately.

5. The method for measuring the center of an energy storage compressor based on a laser tracker according to claim 1, characterized in that, In step two, the laser obstruction area caused by the rear steam seal includes measuring point 10 of the fifth-level diaphragm and measuring point 11 of the sixth-level diaphragm.

6. The method for measuring the center of an energy storage compressor based on a laser tracker according to claim 1, characterized in that, In step four, the shell reference measurement points used to construct the global coordinate system Σ0 include measurement point 3 and measurement point 14 located at both ends of the shell.

7. The method for measuring the center of an energy storage compressor based on a laser tracker according to claim 6, characterized in that, In step one, the outermost measuring point of the rear bearing housing is measuring point 16. The top-down view of the laser tracker must completely cover measuring point 16 without any obstruction.

8. The method for measuring the center of an energy storage compressor based on a laser tracker according to claim 1, characterized in that, In step five, the measuring points for the front bearing housing include measuring point 1 and measuring point 2, and the measuring points for the rear bearing housing include measuring point 15 and measuring point 16.

9. The method for measuring the center of an energy storage compressor based on a laser tracker according to claim 8, characterized in that, Control the distance between the laser tracker and measuring point 1 of the front bearing housing so that the measurement accuracy after the instrument's cumulative working accuracy calculation is no greater than 0.02mm.

10. The method for measuring the center of an energy storage compressor based on a laser tracker according to claim 1, characterized in that, In step seven, the measuring points for the front steam seal include measuring points 4 and 5, and the measuring points for the rear steam seal include measuring points 12 and 13.

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