A high-precision detection device and method for inlet guide vane angle

Abstract

The present invention discloses a high-precision detection device and detection method for the inlet guide vane angle, including a positioning card plate, the positioning card plate including an upper detection plate and a lower positioning plate, the cross-sectional area of ​​the upper detection plate is smaller than that of the lower positioning plate; a pressure plate mounting groove is provided on the positioning card plate, the pressure plate mounting groove passes through the upper detection plate and the lower positioning plate, and the part of the pressure plate mounting groove corresponding to the upper detection plate is not completely closed in the circumferential direction; in the present invention, the high-precision detection device for the inlet guide vane angle is directly assembled and connected to the inlet guide vane, avoiding the problem of poor repeatability of the detection result caused by the installation gap between the components caused by the setting of the transmission mechanism, the first positioning reference surface is installed in conjunction with the second positioning reference surface, and accurate detection of the inlet guide vane angle is achieved through a universal angle ruler, which solves the technical problem that the actual angle of the guide vane is difficult to measure in the guide vane angle detection device in the prior art, thereby resulting in low guide vane adjustment accuracy.

Description

Technical Field

[0001] The present invention belongs to the field of centrifugal compressors and relates to guide vane angle detection, in particular to a high-precision detection device and method for inlet guide vane angles. Background Art

[0002] Centrifugal compressors are widely used in numerous industrial sectors, including metallurgy, petrochemicals, coal chemical industry, natural gas transportation, fertilizers, and pharmaceuticals. As core equipment in key plants, their operating conditions directly impact the safety, stability, and economic benefits of these processes. Centrifugal compressor inlet guide vane adjustment devices offer advantages such as flow regulation, effectively expanding the operating range, saving energy, and improving the compatibility of centrifugal compressor units with user process systems. Consequently, they are used in a variety of single-shaft and multi-shaft centrifugal compressors.

[0003] Centrifugal compressor inlet guide vane adjustment devices are primarily categorized into two types: one employing gears as the basic structure for transmission and guide vane rotation; the other employing a linkage ring, connecting rod, and crank. However, both types of guide vane adjustment devices exhibit shortcomings during the adjustment process, including large actuator clearance, low guide vane adjustment accuracy, poor repeatability, and difficulty measuring the actual guide vane angle. These shortcomings pose operational risks for engineering applications, and are particularly pronounced for the basic stage test accuracy of centrifugal compressor units. These risks can lead to inaccurate test data and erroneous test analysis conclusions. Furthermore, utilizing this test data for compressor design engineering applications can result in significant design deviations and even engineering failure. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a high-precision detection device and detection method for the inlet guide vane angle, so as to solve the technical problem that the guide vane angle detection device in the existing technology has difficulty in measuring the actual angle of the guide vane, thereby resulting in low guide vane adjustment accuracy.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A high-precision detection device for an inlet guide vane angle includes a positioning card plate, wherein the positioning card plate includes an upper detection plate and a lower positioning plate, and the cross-sectional area of ​​the upper detection plate is smaller than that of the lower positioning plate;

[0007] The positioning card plate is provided with a pressure plate mounting groove, the pressure plate mounting groove passes through the upper detection plate and the lower positioning plate, and the portion of the pressure plate mounting groove corresponding to the upper detection plate is not completely closed in the circumferential direction; the pressure plate mounting groove is detachably mounted with a pressure plate, the pressure plate is provided with a screw mounting hole, a screw is mounted in the screw mounting hole, and the lower end of the screw extends downward from the pressure plate mounting groove;

[0008] A first positioning reference surface is formed on the portion of the pressure plate mounting groove located on the lower positioning plate; the first positioning reference surface is parallel to the second positioning reference surface on the end of the guide vane shank;

[0009] A detection reference surface is provided in the longitudinal direction on the upper detection plate, and the detection reference surface is parallel to the inlet guide vane indicator line on the upper end surface of the inlet guide vane.

[0010] The pressure plate mounting groove includes a first through hole that passes through the upper detection plate and the lower positioning plate, and a first rectangular groove and a second rectangular groove are respectively opened on both sides of the first through hole. The first rectangular groove and the second rectangular groove do not completely pass through the lower positioning plate and the depths of the two are the same; the first through hole, the first rectangular groove and the second rectangular groove are connected; the pressure plate includes two symmetrical bosses, which are respectively located in the first rectangular groove and the second rectangular groove.

[0011] A method for high-precision detection of inlet guide vane angles is provided, wherein the method uses the high-precision detection device for inlet guide vane angles to perform detection, and the method comprises the following steps:

[0012] Step 1: By setting parameter values ​​in the PLC control system to control the guide vane at any angle, a guide vane directly above the inlet guide vane adjustment device is selected as a reference measurement guide vane, and the screws and washers at the end of the shank of the reference measurement guide vane are removed to expose the second positioning reference surface at the end of the shank of the inlet guide vane;

[0013] Step 2: Fit the first positioning reference surface at the bottom of the positioning clamp plate to the second positioning reference surface at the end of the guide vane shank of the inlet guide vane, and place the positioning clamp plate on the guide vane shank with its bottom placed on the guide vane crank in the external guide vane adjustment device;

[0014] Step 3: Fix the pressure plate and the positioning clamp plate to the guide vane crank by engaging the screws with the threads at the end of the guide vane handle and tightening them.

[0015] Step 4: Check and adjust so that the detection reference surface on the positioning card is parallel to the inlet guide vane indicator line;

[0016] Step 5: Place one side of the universal angle ruler parallel to the end face of the air inlet cover and the other side parallel to the detection reference surface on the upper detection plate to measure and obtain the actual angle value of the inlet guide vane;

[0017] Step 6: Change the angle of the guide vane by changing the parameter value in the PLC control system, measure the actual angle value of the inlet guide vane in sequence, and record the parameter value set in the PLC control system corresponding to the actual angle value of the inlet guide vane;

[0018] Step 7: After the actual angle value of the inlet guide vane is measured, the high-precision detection device for the inlet guide vane angle is removed, and the screws and gaskets at the end of the guide vane shank are restored.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects:

[0020] (I) In the present invention, the high-precision detection device for the inlet guide vane angle is directly assembled and connected to the inlet guide vane, thereby avoiding the problem of poor repeatability of the detection result caused by the installation gap between the components caused by the setting of the transmission mechanism. The first positioning reference surface and the second positioning reference surface are installed in coordination, and the inlet guide vane angle is accurately detected by a universal angle ruler, thereby solving the technical problem of difficulty in measuring the actual angle of the guide vane in the guide vane angle detection device in the prior art, which leads to low guide vane adjustment accuracy.

[0021] (II) The method of the present invention is used to achieve precise control and repeatability of the inlet guide vane angle in the basic stage test accuracy experiment of the centrifugal compressor unit, ensuring the accuracy and reliability of the performance test data under the guide vane angle, and achieving a one-to-one correspondence between the guide vane angle and the test performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention after assembly with the inlet guide vane;

[0023] Figure 2 It is a cross-sectional view of the overall structure of the present invention;

[0024] Figure 3 Schematic diagram of the assembly structure of the positioning card, pressure plate and screws;

[0025] Figure 4 for Figure 3 Schematic diagram of the specific structure of the structure;

[0026] Figure 5 for Figure 2 Schematic diagram of the overall structure;

[0027] Figure 6 Schematic diagram of the structure of the guide vane adjustment device.

[0028] The meanings of the numbers in the figure are: 1-positioning clamp, 2-pressure plate mounting groove, 3-pressure plate, 4-screw mounting hole, 5-screw, 6-first positioning reference surface, 7-detection reference surface, 8-inlet guide vane, 9-guide vane shank, 10-second positioning reference surface; 11-guide vane crank, 12-connecting plate, 13-interlocking ring;

[0029] 101-upper detection plate, 102-lower positioning plate;

[0030] 201 - first through hole, 202 - first rectangular groove, 203 - second rectangular groove.

[0031] The specific contents of the present invention are further explained in detail below with reference to the embodiments. DETAILED DESCRIPTION

[0032] It should be noted that the inlet guide vane indicator line in the present invention refers to the direction parallel to the guide vane.

[0033] It should be noted that, unless otherwise specified, all components in the present invention are components known in the art.

[0034] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0035] The present invention provides a high-precision detection device for the inlet guide vane angle. Figures 1 to 5 As shown, it includes a positioning card plate 1, which includes an upper detection plate 101 and a lower positioning plate 102. The cross-sectional area of ​​the upper detection plate 101 is smaller than that of the lower positioning plate 102;

[0036] A pressure plate mounting groove 2 is formed on the positioning card plate 1, and the pressure plate mounting groove 2 passes through the upper detection plate 101 and the lower positioning plate 102, and the portion of the pressure plate mounting groove 2 corresponding to the upper detection plate 101 is not completely closed in the circumferential direction; a pressure plate 3 is detachably mounted in the pressure plate mounting groove 2, and a screw mounting hole 4 is formed on the pressure plate 3, in which a screw 5 is mounted, and the lower end of the screw 5 extends downward from the pressure plate mounting groove 2;

[0037] A first positioning reference surface 6 is provided on the portion of the pressure plate mounting groove 2 located on the lower positioning plate 102; the first positioning reference surface 6 is parallel to the second positioning reference surface 10 on the end of the guide vane shank 9; a detection reference surface 7 is provided along the longitudinal direction on the upper detection plate 101, and the detection reference surface 7 is parallel to the inlet guide vane indicator line on the upper end surface of the inlet guide vane 8.

[0038] A guide vane crank 11 is fixedly provided on the second positioning reference surface 10 of the guide vane shank 9. The top of the guide vane crank 11 contacts the bottom of the positioning clamping plate 1. The guide vane crank 11 is fixedly provided on the linkage ring 13 of the centrifuge through the connecting plate 12.

[0039] In the above technical solution, the high-precision detection device for the inlet guide vane angle is directly assembled and connected to the inlet guide vane, avoiding the problem of poor repeatability of the detection results due to the installation gap between the components caused by the setting of the transmission mechanism. The first positioning reference surface and the second positioning reference surface are installed in coordination, and accurate detection of the inlet guide vane angle is achieved through the universal angle ruler, which solves the technical problem of difficulty in measuring the actual angle of the guide vane in the guide vane angle detection device in the prior art, resulting in low guide vane adjustment accuracy.

[0040] The pressure plate mounting groove 2 includes a first through hole 201 that passes through the upper detection plate 101 and the lower positioning plate 102, and a first rectangular groove 202 and a second rectangular groove 203 are respectively opened on both sides of the first through hole 201. The first rectangular groove 202 and the second rectangular groove 203 do not completely pass through the lower positioning plate 102 and the depths of the two are the same; the first through hole 201, the first rectangular groove 202 and the second rectangular groove 203 are connected; the pressure plate 3 includes two symmetrical bosses, which are respectively located in the first rectangular groove 202 and the second rectangular groove 203.

[0041] A high-precision detection method for the inlet guide vane angle is performed using a high-precision detection device for the inlet guide vane angle. Figure 6 , the method comprises the following steps:

[0042] Step 1: By setting parameter values ​​in the PLC control system to control the guide vanes at any angle, a guide vane directly above the inlet guide vane adjustment device is selected as a reference measurement guide vane. The screws and washers at the end of the shank of the reference measurement guide vane are removed to expose the second positioning reference surface 10 at the end of the guide vane shank 9 of the inlet guide vane.

[0043] Step 2: Fit the first positioning reference surface 6 at the bottom of the positioning clamp 1 to the second positioning reference surface 10 at the end of the guide vane shank 9 of the inlet guide vane 8, and place the positioning clamp 1 on the guide vane shank 9 with its bottom placed on the guide vane crank 11 in the external guide vane adjustment device;

[0044] The guide vane adjustment device in the present invention is the centrifugal compressor inlet guide vane adjustment device in the utility model patent "Centrifugal compressor inlet guide vane adjustment device and centrifugal compressor" CN210715220U.

[0045] Step 3: Fix the pressure plate 3 and the positioning clamping plate 1 to the guide vane crank 11 by engaging and tightening the screw 5 with the thread at the end of the guide vane shank 9 .

[0046] Step 4: Check and adjust so that the detection reference surface 7 on the positioning card plate 1 is parallel to the inlet guide vane indicator line;

[0047] Step 5: Place one side of the universal angle ruler parallel to the end face of the air inlet cover and the other side parallel to the detection reference surface 7 on the upper detection plate 101 to measure and obtain the actual angle value of the inlet guide vane;

[0048] Step 6: Change the angle of the guide vane by changing the parameter value in the PLC control system, measure the actual angle value of the inlet guide vane in sequence, and record the parameter value set in the PLC control system corresponding to the actual angle value of the inlet guide vane;

[0049] In the above technical solution, the angle value range and angle step of the inlet guide vane are determined by the user.

[0050] Step 7: After the actual angle value of the inlet guide vane is measured, the high-precision detection device for the inlet guide vane angle is removed, and the screws and gaskets at the end of the guide vane shank are restored.

[0051] In the above technical solution, in the basic-stage test accuracy experiment of the centrifugal compressor unit, precise control and repeatability of the inlet guide vane angle were achieved, ensuring the accuracy and reliability of the performance test data under the guide vane angle, and achieving a one-to-one correspondence between the guide vane angle and the test performance.

[0052] Actual measurement example:

[0053] In a performance test project for matching inlet guide vanes of a semi-open impeller basic stage, the inlet guide vane angle high-precision detection device of the utility model is used to detect the inlet guide vane angle, which mainly includes the following steps:

[0054] Step 1: By setting parameter values ​​in the PLC control system to control the guide vanes at any angle, a guide vane directly above the inlet guide vane adjustment device is selected as a reference measurement guide vane. The screws and washers at the end of the shank of the reference measurement guide vane are removed to expose the second positioning reference surface 10 at the end of the guide vane shank 9 of the inlet guide vane.

[0055] Step 2: Fit the first positioning reference surface 6 at the bottom of the positioning clamp 1 to the second positioning reference surface 10 at the end of the guide vane shank 9 of the inlet guide vane 8, and place the positioning clamp 1 on the guide vane shank 9 with its bottom placed on the guide vane crank 11 in the external guide vane adjustment device;

[0056] Step 3: Fix the pressure plate 3 and the positioning clamping plate 1 to the guide vane crank 11 by engaging and tightening the screw 5 with the thread at the end of the guide vane shank 9 .

[0057] Step 4: Check and adjust so that the detection reference surface 7 on the positioning card plate 1 is parallel to the inlet guide vane indicator line;

[0058] Step 5: Place one side of the universal angle ruler parallel to the end face of the air inlet cover and the other side parallel to the detection reference surface 7 on the upper detection plate 101 to measure and obtain the actual angle value of the inlet guide vane;

[0059] Step 6: Change the guide vane angle by changing the parameter value in the PLC control system. Measure the actual guide vane angle value at each angle from the maximum angle of -25° to the minimum angle of 75° at intervals of 10°, and record the parameter value set in the PLC control system corresponding to the actual guide vane angle value.

[0060] Step 7: After the actual angle value of the inlet guide vane is measured, the high-precision detection device for the inlet guide vane angle is removed, and the screws and gaskets at the end of the guide vane shank are restored.

[0061] In the above-mentioned actual measurement example, during the performance test of the inlet guide vanes of the semi-open impeller basic stage, the PLC control system controlled the inlet guide vane angles one by one from the maximum angle of -25° to the minimum angle of 75°, thereby achieving accurate performance testing of the inlet guide vanes at various typical angles of the basic stage. The degree of consistency between the measured performance and the predicted performance of the basic stage was improved by 5%, ensuring that the basic stage test results met development requirements.

Claims

1. A high-precision detection device for inlet guide vane angle, characterized in that: It comprises a positioning card plate (1), wherein the positioning card plate (1) comprises an upper detection plate (101) and a lower positioning plate (102), and the cross-sectional area of ​​the upper detection plate (101) is smaller than that of the lower positioning plate (102); The positioning card plate (1) is provided with a pressure plate installation groove (2), the pressure plate installation groove (2) passes through the upper detection plate (101) and the lower positioning plate (102), and the portion of the pressure plate installation groove (2) corresponding to the upper detection plate (101) is not completely closed in the circumferential direction; a pressure plate (3) is detachably installed in the pressure plate installation groove (2), a screw installation hole (4) is provided on the pressure plate (3), a screw (5) is installed in the screw installation hole (4), and the lower end of the screw (5) extends downward from the pressure plate installation groove (2); A first positioning reference surface (6) is provided on the portion of the pressure plate mounting groove (2) located on the lower positioning plate (102); the first positioning reference surface (6) is parallel to a second positioning reference surface (10) on the end of the guide vane shank (9); A detection reference surface (7) is provided on the upper detection plate (101) in the longitudinal direction, and the detection reference surface (7) is parallel to the inlet guide vane indicator line on the upper end surface of the inlet guide vane (8).

2. The high-precision detection device for inlet guide vane angle according to claim 1, characterized in that: The pressure plate mounting groove (2) includes a first through hole (201) that passes through the upper detection plate (101) and the lower positioning plate (102), and a first rectangular groove (202) and a second rectangular groove (203) are respectively opened on both sides of the first through hole (201), the first rectangular groove (202) and the second rectangular groove (203) do not completely pass through the lower positioning plate (102) and the depths of the two are the same; the first through hole (201), the first rectangular groove (202) and the second rectangular groove (203) are connected; the pressure plate (3) includes two symmetrical bosses, which are respectively located in the first rectangular groove (202) and the second rectangular groove (203).

3. A high-precision detection method for inlet guide vane angle, characterized in that: The high-precision detection device for inlet guide vane angle according to any one of claims 1 to 2 is used for detection, and the method comprises the following steps: Step 1, by setting parameter values ​​in the PLC control system to control the guide vane to be at any angle, a guide vane directly above the inlet guide vane adjustment device is selected as a reference measurement guide vane, and the screws and gaskets at the end of the stalk of the reference measurement guide vane are removed to expose the second positioning reference surface (10) at the end of the guide vane stalk (9) of the inlet guide vane; Step 2: by matching the first positioning reference surface (6) at the bottom of the positioning card plate (1) with the second positioning reference surface (10) at the end of the guide vane shank (9) of the inlet guide vane (8), the positioning card plate (1) is mounted on the guide vane shank (9) and the bottom thereof is placed on the guide vane crank (11) in the external guide vane adjustment device; Step 3, by engaging and tightening the screw (5) with the threaded end of the guide vane shank (9), the pressure plate (3) and the positioning clamping plate (1) are fixed to the guide vane crank (11); Step 4, check and adjust so that the detection reference surface (7) on the positioning card (1) is parallel to the inlet guide vane indicator line; Step 5: Place one side of the universal angle ruler parallel to the end face of the air inlet cover and the other side parallel to the detection reference surface (7) on the upper detection plate (101) to measure and obtain the actual angle value of the inlet guide vane; Step 6: Change the angle of the guide vane by changing the parameter value in the PLC control system, measure the actual angle value of the inlet guide vane in sequence, and record the parameter value set in the PLC control system corresponding to the actual angle value of the inlet guide vane; Step 7: After the actual angle value of the inlet guide vane is measured, the high-precision detection device for the inlet guide vane angle is removed, and the screws and gaskets at the end of the guide vane shank are restored.

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