Compressor plane cascade probe measurement slideway sealing device

Abstract

The invention discloses a gas compressor plane cascade probe measurement slide way sealing device which comprises a plane cascade, a probe and a driving mechanism, a probe sliding groove is formed in a first grid plate in the length direction of the grid plate, and a probe mounting hole is formed in a second grid plate; a sliding sealing mechanism is arranged between the driving mechanism and the first grid plate, the sliding sealing mechanism comprises a sealing shell, a sliding shaft and a sealing connecting pipe, one end of the sealing connecting pipe is fixedly connected with the first grid plate, and the other end of the sealing connecting pipe is fixedly connected with one side of the sealing shell; the end part of the mounting connecting rod of the probe extends out of the probe chute, and the end part of the mounting connecting rod of the probe penetrates through the sealing shell and then is connected with the driving mechanism; and a plugging cover capable of sealing the probe mounting holes is arranged on one side, deviating from the first grid plate, of the second grid plate. The problem of test sealing leakage can be solved through the slideway sealing device, and the accuracy of a test data acquisition result is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of compressor plane cascade test, in particular to a kind of compressor plane cascade probe measurement slide sealing device. BACKGROUND

[0002] In aerodynamic experimental research, plane cascade test is an important experimental method, mainly used to study the blade aerodynamic performance of turbomachinery (such as compressor, turbine, etc.). Its core idea is to decompose the complex three-dimensional problem into controllable two-dimensional scientific problem, and its data is the bridge connecting theoretical calculation and real mechanical design. Five-hole probe is the core tool for high-precision flow parameter measurement in plane cascade experiment, which can obtain detailed aerodynamic data of three-dimensional flow field, and is crucial for cascade performance analysis and design optimization. Based on the important role of five-hole probe in experiment, strict requirements are put forward for the use of five-hole probe, for example: the installation of five-hole probe needs to be opposite to the outlet of the blade in the compressor cascade, and the theoretical outlet flow angle of the blade should be consistent; the five-hole probe is located at the outlet axial section of the compressor cascade, and the position of 0.4 times the axial chord length is generally selected; the motion area covered by five-hole probe covers two effective pitches.

[0003] Based on the requirement that the sensing part of the five-hole probe is located at the outlet section of the compressor cascade, the position of 0.4 times the axial chord length is generally selected; the motion area covered by five-hole probe covers two effective pitches. The installation position and motion range of five-hole probe in plane cascade test piece are constrained and limited. Five-hole probe is controlled by the displacement mechanism motion control system of the test bench to move accurately. Five-hole probe is clamped on the displacement mechanism, and under the motion control of the displacement mechanism, five-hole probe moves accurately according to the required motion trajectory. During the motion of five-hole probe, there will be interference with the grid plate of plane cascade, so a through slot needs to be opened on the grid plate during the design of test piece according to the collection position and motion trajectory of five-hole probe, so that five-hole probe can pass through the through slot and extend into the flow passage of plane cascade, and the probe is in the specified position state required for experimental collection.

[0004] Since the five-hole probe motion slot opened on the plane cascade grid plate penetrates the grid plate, the flow passage on the inner side of the grid plate is connected with the external space of the test piece, which will cause the gas in the flow passage of plane cascade test to leak to the outside during the blowing test, destroy the uniformity and consistency of the outlet flow field of plane cascade compressor blade, and cause certain deviation in the data collected by five-hole probe, resulting in distortion of test results and inability to ensure the accuracy of test.

[0005] The key to planar blade cascade testing is acquiring core aerodynamic parameters of the compressor planar blade cascade, such as angle of attack, outlet flow angle, and total pressure loss coefficient, using a five-hole probe. Providing a reliable operating environment for the five-hole probe data acquisition during the experiment is crucial. Therefore, there is an urgent need to provide a sealing device for the measuring slide of the compressor planar blade cascade probe to solve the problem of the moving groove of the five-hole probe affecting the accuracy of the experiment. Summary of the Invention

[0006] To address the aforementioned shortcomings of existing technologies, the present invention aims to solve the problem that during air blowing tests, the five-hole probe moving groove causes gas leakage from the planar blade cascade test flow channel to the outside, disrupting the uniformity and consistency of the flow field at the outlet of the planar blade cascade compressor blades. This leads to deviations in the data collected by the five-hole probe, resulting in distorted test results and compromising the accuracy of the test. The present invention provides a sealing device for the measuring slide of a compressor planar blade cascade probe, which effectively solves the problem of test sealing leakage and ensures the accuracy of the test data acquisition results.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a compressor planar blade cascade probe measurement slide sealing device, comprising a planar blade cascade, a probe, and a driving mechanism, wherein the planar blade cascade includes a first cascade plate, a second cascade plate, and blades disposed between the first cascade plate and the second cascade plate; a probe groove is provided on the first cascade plate along the length direction of the cascade plate, the probe groove passing through both sides of the first cascade plate, and a probe mounting hole parallel to the probe groove is provided on the second cascade plate at a position corresponding to the probe groove; characterized in that: a sliding sealing mechanism is provided between the driving mechanism and the first cascade plate, the sliding sealing mechanism... The sealing mechanism includes a sealing housing, a sliding shaft, and a sealing connecting tube. The sealing housing has a shaft hole extending through both ends. A sliding retaining sleeve is provided at each end of the shaft hole of the sealing housing. The sliding shaft passes through the shaft hole and is slidably connected to the two sliding retaining sleeves. One end of the sealing connecting tube is fixedly connected to the first grid plate and encloses the probe groove inside the connecting tube. The other end of the sealing connecting tube is fixedly connected to one side of the sealing housing. On opposite sides of the sealing housing, a strip-shaped hole is provided corresponding to the position of the probe groove. The strip-shaped hole on the side of the sealing housing closer to the first grid plate is located inside the sealing connecting tube. The end of the probe mounting connecting rod extends out of the probe slide groove and passes through the sealing connecting tube and the strip hole on one side of the sealing housing in sequence. Then it passes through the sliding shaft and extends out from the strip hole on the other side of the sealing housing. The end of the probe mounting connecting rod passes through the sealing housing and is connected to the drive mechanism. By driving each mechanism, the probe can be moved to translate and rotate around the axis of its mounting connecting rod. On the side of the second grid plate opposite to the first grid plate, there is a sealing cap that can close the probe mounting hole.

[0008] Further, the length of the strip-shaped hole on the sealing shell is consistent with the length of the probe sliding groove, and the two ends of the strip-shaped hole are respectively aligned with the two ends of the probe sliding groove.

[0009] Further, the driving mechanism comprises a displacement sliding table and a rotating table; the displacement sliding table is provided with a linear driving device, the rotating table is slidingly installed on the displacement sliding table and connected with the linear driving device, and the rotating table can be driven to move along the displacement sliding table by the linear driving device; the rotating table is provided with a rotating driving shaft, the mounting connecting rod of the probe is connected with the rotating driving shaft of the rotating table and can rotate synchronously with the rotating driving shaft.

[0010] Further, a connecting assembly is arranged between the sliding sealing mechanism and the driving mechanism, the connecting assembly comprises a first clamp head and a second clamp head, and the two ends of the first clamp head and the second clamp head are respectively connected through connecting rod assemblies; A driving sleeve is arranged on the sliding shaft, the driving sleeve is sleeved on the mounting connecting rod of the probe and is fixedly connected with the sliding shaft, and the driving sleeve and the mounting connecting rod are in clearance fit; one end of the driving sleeve away from the planar leaflet passes through the strip-shaped hole and is fixedly connected with the first clamp head; The rotating driving shaft of the rotating table is connected with a probe clamping sleeve, the probe clamping sleeve is fixedly connected with the second clamp head, the mounting connecting rod of the probe passes through the driving sleeve and extends into the probe clamping sleeve, and the probe clamping sleeve is locked and fixed by the locking clamp.

[0011] Further, the first clamp head and the second clamp head each comprise two clamp plates, the two clamp plates are connected through connecting bolts, and a recess is arranged at the corresponding position of the side of the two clamp plates facing each other, and the recesses on the two clamp plates can cooperate to form a clamping hole; The driving sleeve and the probe clamping sleeve pass through the clamping holes on the first clamp head and the second clamp head respectively and are clamped and fixed by the two clamp plates.

[0012] Further, the connecting assembly comprises four connecting struts, two of which are connected with the two ends of the first clamp head through joint bearings, and the other two are connected with the two ends of the second clamp head through joint bearings; the adjacent ends of the two connecting struts corresponding to the opposite ends of the first clamp head and the second clamp head are each provided with a thread, and the two are connected through a threaded connecting sleeve, and the distance between the first clamp head and the second clamp head can be adjusted through the threaded connecting sleeve.

[0013] Further, the sealing connecting pipe is formed integrally with the sealing shell, one end of the sealing connecting pipe connected with the first grid plate is sleeved with a connecting flange plate, and the connecting flange plate is fixedly connected with the first grid plate.

[0014] Compared with the prior art, the present application has the following advantages: 1. The five-hole probe is used to collect through the grid plate in the compressor plane cascade test, and the sealing leakage problem of the test is solved through the sliding sealing device, so as to ensure the accuracy of the test data collection results.

[0015] 2. The sliding sealing device has simple structure, low manufacturing cost, and can be combined with the original equipment of the test bed. The sealing device can meet the test requirements without changing the original structure of the test bed, and is easy to install and debug, and has universality. 3. The sliding sealing device realizes the synchronization and consistency with the movement of the displacement mechanism of the test bed, and meets the requirements of the compressor cascade test. DETAILED DESCRIPTION

[0016] Figure 1 It is a structural schematic diagram of the application.

[0017] Figure 2 It is a connection structure diagram of the sliding sealing mechanism, the probe and the first grid plate in the application.

[0018] Figure 3 It is a structural schematic diagram of the compressor cascade grid plate.

[0019] In the figure: 1-probe, 2-first grid plate, 3-second grid plate, 4-blade, 5-probe sliding groove, 6-probe mounting hole, 7-sealing shell, 8-sliding shaft, 9-sealing connecting pipe, 10-plugging cover, 11-displacement sliding table, 12-rotary table, 13-first chuck, 14-second chuck, 15-linkage assembly, 16-driving sleeve, 17-probe clamping sleeve, 18-locking chuck. DETAILED DESCRIPTION

[0020] The application will be further described below in combination with the drawings and examples.

[0021] Example: Referring to Figure 1 , Figure 2 and Figure 3 , a compressor plane cascade probe measurement sliding sealing device, comprising a plane cascade, a probe 1 and a driving mechanism. The plane cascade is a conventional cascade test piece designed for compressor plane cascade test, comprising a first grid plate 2, a second grid plate 3 and a blade 4 arranged between the first grid plate 2 and the second grid plate 3. A probe sliding groove 5 is arranged on the first grid plate 2 along the length direction of the grid plate, the probe sliding groove 5 penetrates through both sides of the first grid plate 2, and a probe mounting hole 6 parallel to the probe sliding groove 5 is arranged on the second grid plate 3 corresponding to the position of the probe sliding groove 5. In the implementation, the probe 1 adopts a five-hole probe 1.

[0022] A sliding sealing mechanism is arranged between the driving mechanism and the first grid plate 2, and comprises a sealing shell 7, a sliding shaft 8 and a sealing connecting pipe 9. The sealing shell 7 has a shaft hole penetrating through both ends thereof, and a sliding retaining sleeve is arranged at each end of the shaft hole of the sealing shell 7. The sliding shaft 8 penetrates through the shaft hole and is connected to the sliding retaining sleeves in sliding fit. In actual processing, the sealing shell 7 is in a cylindrical structure, and the outer diameter of the sliding retaining sleeve matches the hole diameter of the shaft hole, so as to ensure the concentricity of the sliding retaining sleeves at both ends of the sealing shell 7. The sliding shaft 8 is in clearance fit with the shaft hole, so as to realize the sliding sealing of the sealing shell 7.

[0023] One end of the sealing connecting pipe 9 is fixedly connected to the first grid plate 2 and seals the probe sliding groove 5 in the connecting pipe. The other end of the sealing connecting pipe 9 is fixedly connected to one side of the sealing shell 7, and a strip-shaped hole is arranged at each of the opposite sides of the sealing shell 7 corresponding to the position of the probe sliding groove 5. Among them, the strip-shaped hole on the side of the sealing shell 7 close to the first grid plate 2 is located in the sealing connecting pipe 9. In this way, the probe sliding groove 5 and the sealing shell 7 are sealed by the sealing connecting pipe 9, so as to ensure the sealing effect of the probe sliding groove 5. In implementation, the length of the strip-shaped hole on the sealing shell 7 is consistent with the length of the probe sliding groove 5, and the two ends of the strip-shaped hole are respectively aligned with the two ends of the probe sliding groove 5; so as to ensure that the movement of the probe 1 is not affected, and the accuracy of detection is ensured. Among them, the sealing connecting pipe 9 and the sealing shell 7 are formed as a whole, and a connecting flange is arranged on the end connected to the first grid plate 2, and the sealing connecting pipe 9 is fixedly connected to the first grid plate 2 through the connecting flange.

[0024] The end of the mounting connecting rod of the probe 1 extends out of the probe sliding groove 5, penetrates through the strip-shaped hole on one side of the sealing connecting pipe 9 and the sealing shell 7 in sequence, and then extends out of the strip-shaped hole on the other side of the sealing shell 7 after penetrating through the sliding shaft 8. The end of the mounting connecting rod of the probe 1 is connected to the driving mechanism after penetrating through the sealing shell 7, and the driving mechanism can drive the probe 1 to translate and rotate around the axis of the mounting connecting rod.

[0025] Among them, the driving mechanism comprises a displacement sliding table 11 and a rotating table 12. The displacement sliding table 11 has a linear driving device, and the rotating table 12 is slidingly installed on the displacement sliding table 11 and connected to the linear driving device, so that the linear driving device can drive the rotating table 12 to move in translation sliding. The rotating table 12 has a rotating driving shaft, and the mounting connecting rod of the probe 1 is connected to the rotating driving shaft of the rotating table 12 and can rotate synchronously with the rotating driving shaft. That is, the rotating table 12 can drive the probe 1 to rotate freely around the axis of the mounting connecting rod. In this scheme, the driving mechanism is a prior art, which will not be described here.

[0026] In the implementation, a connecting assembly is arranged between the sliding sealing mechanism and the driving mechanism, and the connecting assembly comprises a first clamp head 13 and a second clamp head 14, and the first clamp head 13 and the second clamp head 14 are connected by a connecting rod assembly 15 at two ends respectively.

[0027] A driving sleeve 16 is arranged on the sliding shaft 8, the driving sleeve 16 is sleeved on the mounting connecting rod of the probe 1 and is fixedly connected with the sliding shaft 8, and the driving sleeve 16 is in clearance fit with the mounting connecting rod. In the implementation, the driving sleeve 16 penetrates the sliding shaft 8 from the middle part of the sliding shaft 8, and the mounting connecting rod of the probe 1 penetrates the driving sleeve 16; a sealing washer is further arranged between the driving sleeve 16 and the mounting connecting rod to improve the sealing performance between the probe 1 and the driving sleeve 16. The end of the driving sleeve 16 away from the planar leaflet penetrates the strip-shaped hole and is fixedly connected with the first clamp head 13.

[0028] The rotating driving shaft of the rotating table 12 is connected with a probe clamping sleeve 17, the probe clamping sleeve 17 is fixedly connected with the second clamp head 14; the mounting connecting rod of the probe 1 penetrates the driving sleeve 16 and extends into the probe clamping sleeve 17, and is locked and fixed with the probe clamping sleeve 17 by a locking clamp head 18.

[0029] In the specific implementation process, the first clamp head 13 and the second clamp head 14 each comprise two clamping plates, the two clamping plates are connected by connecting bolts, and a recess is arranged at the corresponding position of the side of the two clamping plates facing each other, and the recesses on the two clamping plates can cooperate to form a clamping hole. The driving sleeve 16 and the probe clamping sleeve 17 penetrate the clamping holes on the first clamp head 13 and the second clamp head 14 respectively and are clamped and fixed by the two clamping plates.

[0030] In the scheme, the connecting assembly comprises four connecting struts, two of which are connected with two ends of the first clamp head 13 through joint bearings, and the other two are connected with two ends of the second clamp head 14 through joint bearings. Adjacent ends of the two connecting struts corresponding to one end of the first clamp head 13 and the second clamp head 14 are provided with threads and are connected through a threaded connecting sleeve, and the distance between the first clamp head 13 and the second clamp head 14 can be adjusted through the threaded connecting sleeve. By adopting the above structure, the distance between the two clamp heads can be adjusted as needed; at the same time, the connecting struts and the clamp heads are connected through joint bearings, and the joint bearings can eliminate the deviation in the horizontal and vertical directions during connection, so that the driving mechanism and the sliding sealing mechanism are not concentric during installation and cannot operate normally.

[0031] A plugging cover 10 capable of closing the probe mounting hole 6 is arranged on the side of the second grid plate 3 away from the first grid plate 2.

[0032] In the working process of the scheme, the rotating table 12 is moved by the translation mechanism, the rotating drive shaft of the rotating table 12 is transmitted to the connecting assembly through the probe 1 connecting sleeve, the connecting assembly is moved by the driving sleeve 16 through the sliding shaft 8, at the same time, the probe 1 connecting sleeve drives the probe 1 to move synchronously; in the whole translation process, the probe 1 is only translated by the action of the probe 1 connecting sleeve, and the stability is good; due to the gap fit between the mounting connecting pipe of the probe 1 and the driving sleeve 16, in the rotating process, the probe 1 is only rotated by the action of the probe 1 connecting sleeve, so that the probe 1 is not affected by external force, and the accuracy and stability of the probe 1 detection are ensured.

[0033] In the process of the compressor plane cascade test, the probe sliding chute 5 is closed by the sealing connecting pipe 9, the other end of the sealing connecting pipe 9 is fixed with the sealing shell 7, the sealing shell 7 is matched with the sliding shaft 8 to form a sliding seal, so that the whole probe sliding chute 5 is sealed. The problem of gas leakage at the probe 1 groove of the grid plate when the five-hole probe 1 is used to collect through the grid plate is solved efficiently, and the accuracy of the test data collection result is ensured.

[0034] The slide sealing device has the advantages of simple structure, low manufacturing cost, combination with the original equipment of the test table, meeting the test requirements on the basis of not changing the original structure of the test table, easy installation and debugging, good universality, synchronization and consistency with the movement of the displacement mechanism of the test table, and meeting the requirements of the compressor cascade test.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit the technical solutions, and those of ordinary skill in the art should understand that the technical solutions of the present application are modified or replaced, without departing from the purpose and scope of the technical solutions, which should be covered in the scope of the claims of the present application.

Claims

1. A sealing device for a compressor planar blade cascade probe measuring slide, comprising a planar blade cascade, a probe, and a driving mechanism, wherein the planar blade cascade includes a first cascade plate, a second cascade plate, and blades disposed between the first cascade plate and the second cascade plate; a probe groove is provided on the first cascade plate along the length direction of the cascade plate, the probe groove passing through both sides of the first cascade plate, and a probe mounting hole parallel to the probe groove is provided on the second cascade plate at a position corresponding to the probe groove; characterized in that: A sliding sealing mechanism is provided between the drive mechanism and the first grid plate. The sliding sealing mechanism includes a sealing housing, a sliding shaft, and a sealing connecting tube. The sealing housing has a shaft hole that extends through both ends of the sealing housing. A sliding retaining sleeve is provided at each end of the shaft hole of the sealing housing. The sliding shaft extends through the shaft hole and is slidably connected to the two sliding retaining sleeves. One end of the sealing connecting tube is fixedly connected to the first grid plate and encloses the probe groove inside the connecting tube. The other end of the sealing connecting tube is fixedly connected to one side of the sealing housing. On opposite sides of the sealing housing, a strip-shaped hole is provided corresponding to the position of the probe groove. The strip-shaped hole on the side of the sealing housing closer to the first grid plate is located inside the sealing connecting tube. The end of the probe mounting connecting rod extends out of the probe slide groove and passes through the sealing connecting tube and the strip hole on one side of the sealing housing in sequence. Then it passes through the sliding shaft and extends out from the strip hole on the other side of the sealing housing. The end of the probe mounting connecting rod passes through the sealing housing and is connected to the drive mechanism. By driving each mechanism, the probe can be moved to translate and rotate around the axis of its mounting connecting rod. On the side of the second grid plate opposite to the first grid plate, there is a sealing cap that can close the probe mounting hole.

2. The compressor planar blade probe measuring slide sealing device according to claim 1, characterized in that: The length of the strip hole on the sealing housing is the same as the length of the probe groove, and the two ends of the strip hole are aligned with the two ends of the probe groove.

3. The compressor planar blade probe measuring slide sealing device according to claim 1, characterized in that: The driving mechanism includes a displacement slide and a rotary table; the displacement slide has a linear drive device, the rotary table is slidably mounted on the displacement slide and connected to the linear drive device, and the linear drive device can drive the rotary table to move along the translational sliding path; the rotary table has a rotary drive shaft, the mounting connecting rod of the probe is connected to the rotary drive shaft of the rotary table and can rotate synchronously with the rotary drive shaft.

4. The compressor planar blade probe measuring slide sealing device according to claim 3, characterized in that: A connecting assembly is provided between the sliding sealing mechanism and the driving mechanism. The connecting assembly includes a first clamp and a second clamp, and the two ends of the first clamp and the second clamp are respectively connected by a connecting rod assembly. A drive sleeve is provided on the sliding shaft. The drive sleeve is sleeved on the mounting connecting rod of the probe and fixedly connected to the sliding shaft. The drive sleeve and the mounting connecting rod are clearance-fitted. The end of the drive sleeve facing away from the planar leaf passes through the strip hole and is fixedly connected to the first clamp. The rotary table's rotation drive shaft is connected to a probe clamping sleeve, which is fixedly connected to a second clamp. The probe's mounting connecting rod passes through the drive sleeve and extends into the probe clamping sleeve, where it is locked and fixed by a locking clamp.

5. The compressor planar blade probe measuring slide sealing device according to claim 4, characterized in that: The first chuck and the second chuck each include two clamping plates, which are connected by connecting bolts. A groove is provided at a corresponding position on the opposite side of the two clamping plates, and the grooves on the two clamping plates can cooperate to form a clamping hole. The drive sleeve and probe clamping sleeve pass through the clamping holes on the first chuck and the second chuck, respectively, and are clamped and fixed by the two clamping plates.

6. The compressor planar blade probe measuring slide sealing device according to claim 4, characterized in that: The connecting assembly includes four connecting rods, two of which are connected to both ends of the first clamp via spherical bearings, and the other two connecting rods are connected to both ends of the second clamp via spherical bearings. The adjacent ends of the two connecting rods at the corresponding ends of the first and second clamps are threaded and connected by a threaded connecting sleeve, which allows the distance between the first and second clamps to be adjusted.

7. The compressor planar blade probe measuring slide sealing device according to claim 1, characterized in that: The sealing connecting pipe is integrally formed with the sealing housing, and a connecting flange is fitted at one end of the pipe that is connected to the first grid plate, and the pipe is fixedly connected to the first grid plate through the connecting flange.

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