CN215865336U

CN215865336U - Air flow testing and rectifying device for large workpiece of engine combustion chamber

Info

Publication number: CN215865336U
Application number: CN202122165848.8U
Authority: CN
Inventors: 韩超; 杨飞
Original assignee: Establishment of Aviation Co Ltd
Current assignee: Establishment of Aviation Co Ltd
Priority date: 2021-09-08
Filing date: 2021-09-08
Publication date: 2022-02-18
Anticipated expiration: 2031-09-08

Abstract

The utility model discloses an air flow testing and rectifying device for a large workpiece of an engine combustion chamber, which comprises a cylinder body, wherein the upper end of the cylinder body is fixedly connected with a workpiece mounting seat, quick clamps are arranged on two sides of a positioning boss, a rectifying grid is arranged between a first frame plate and a second frame plate, the rectifying grid divides the inner cavity of the cylinder body into an airflow winding chamber and an airflow passing chamber, a tangential air inlet is arranged on the side surface of the airflow winding chamber, and a static pressure measuring point is arranged on the side wall of the upper part of the airflow passing chamber. According to the large-sized workpiece air flow testing rectifying device for the engine combustion chamber, the tangential air inlet is arranged, the air flow is wound by utilizing the tangential air inlet principle, the generation of vortex is reduced, the flow field is more stable, the volume of the cylinder is reduced, the installation and use area of the device is reduced, a more accurate static pressure average value is obtained through data of a plurality of static pressure measuring points, and the measuring precision is improved.

Description

Air flow testing and rectifying device for large workpiece of engine combustion chamber

Technical Field

The utility model relates to the technical field of air flow testing, in particular to an air flow testing and rectifying device for a large workpiece of an engine combustion chamber.

Background

The air flow rate test is carried out on the premise that a stable flow field at the inlet and the outlet of a tested workpiece needs to be established, so that stable pressure difference data at the inlet and the outlet of the workpiece can be obtained, and the stable data is fed back to flow equipment to test stable flow rate data, in an engine, a flame tube, a casing, a swirler, a turbine blade and the like need to carry out air flow rate test under corresponding differential pressure to ensure that a combustion working state achieves reasonable oil-gas ratio or obtain corresponding air film cooling effect, so that the air flow rate test precision of the parts is particularly important, a long and thin flow channel is used in the early stage and most of the existing test devices, a spoiler is additionally arranged to control the air flow stability at the inlet of the tested part, continuous vortex is formed suddenly and easily, and a rectifying grid can cause vortex-like flow due to uneven air flow rate in different regions, so that a long enough air flow channel is needed to carry out self-elimination of the vortex, therefore, the device is slender, the occupied area is large, airflow eddy in the channel is more, the sampling precision of a static pressure port is easily interfered, the repeatability of flow test is not high, and the flow test precision is poor. For this purpose, we propose a large workpiece air flow test fairing for the engine combustion chamber.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an air flow testing and rectifying device for a large workpiece of an engine combustion chamber, which aims to solve the problems in the background technology.

In order to achieve the purpose, the utility model provides the following technical scheme: the large-scale workpiece air flow testing and rectifying device for the engine combustion chamber comprises a barrel body, universal wheels are arranged at the bottom end of the barrel body, a workpiece mounting seat is fixedly connected to the upper end of the barrel body, a through hole is formed in the middle of the workpiece mounting seat, a positioning boss is arranged above the through hole, quick clamps are arranged on two sides of the positioning boss, a clamping groove is formed in one side in the barrel body, a side hole is formed in the other side of the barrel body, the clamping groove and the side hole are symmetrically arranged, a first frame plate and a second frame plate are movably clamped in the clamping groove and the side hole respectively, a rectifying grid is arranged between the first frame plate and the second frame plate, an inner cavity of the barrel body is divided into an air flow winding chamber and an air flow passing chamber by the rectifying grid, the air flow passing chamber is located above the air flow winding chamber, a tangential air inlet is formed in the side surface of the air flow winding chamber, and a static pressure measuring point is arranged on the side wall of the upper portion of the air flow passing chamber, the static pressure measurement points are at least three and are arranged at intervals.

Preferably, a slot is formed in the inner wall of the side hole, and an insertion block is fixedly connected to the side face of the second frame plate and inserted into the slot.

Preferably, the fixed plates are symmetrically and fixedly connected to two sides of the second frame plate, guide posts are arranged on the side faces of the fixed plates, guide grooves are formed in the side walls of the cylinder body, the guide posts are inserted in the guide grooves, and handles are fixedly connected to the side faces of the second frame plate.

Preferably, the side wall of the guide post is provided with an annular bulge.

Preferably, the side hole is provided with a sealing device on the side surface of the inner wall of the cylinder body.

Compared with the prior art, the utility model has the beneficial effects that: the rectifying device for testing the air flow of the large-sized workpiece of the engine combustion chamber is provided with the tangential air inlet, the air flow is naturally coiled by utilizing a tangential air inlet principle, the generation of vortex is reduced, a flow field is more stable, the air flow can be naturally coiled by utilizing the tangential air inlet and the circular cylinder body and is more uniformly dispersed in the air flow coiling chamber, the air flow is combed into a smooth and stable flow field through the rectifying grating to continuously flow upwards, the stability of the air flow is ensured, the volume of the cylinder body is reduced, the installation and use area of the device is reduced, a plurality of static pressure measuring points which are uniformly distributed in the circumferential direction are mutually connected, the premise is provided for stable and accurate static pressure input of flow equipment, a more accurate static pressure average value is obtained through data of the static pressure measuring points, the measurement precision is improved, the rapid installation of the measured workpiece is realized by utilizing a rapid clamp, and the installation speed is higher than that the conventional flange plate is fastened by bolts under the premise of safety, the testing efficiency is improved.

Drawings

FIG. 1 is a front cross-sectional view of the present invention;

FIG. 2 is a top cross-sectional view of the present invention;

FIG. 3 is a perspective view of a second frame plate according to the present invention;

fig. 4 is an enlarged schematic view of a portion a of fig. 1.

In the figure: the device comprises a cylinder body 1, a universal wheel 2, a workpiece mounting seat 3, a through hole 4, a positioning boss 5, a quick clamp 6, a clamping groove 7, a side hole 8, a first frame plate 9, a second frame plate 10, a rectifying grating 11, an airflow winding chamber 12, an airflow passing chamber 13, a tangential air inlet 14, a slot 15, an insertion block 16, a fixing plate 17, a guide column 18, a guide groove 19, an annular bulge 20, a sealing device 21, a handle 22 and a static pressure measuring point 23.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a technical solution: the air flow testing and rectifying device for the large-sized workpiece of the engine combustion chamber comprises a cylinder body 1, wherein universal wheels 2 are arranged at the bottom end of the cylinder body 1, the cylinder body 1 is a circular cylinder body, and a plurality of groups of universal wheels 2 are arranged according to the volume of the cylinder body 1, can drive the cylinder body 1 to move, and is convenient for the cylinder body 1 to move;

the upper end of the cylinder body 1 is fixedly connected with a workpiece mounting seat 3, the middle part of the workpiece mounting seat 3 is provided with a through hole 4, a positioning boss 5 is arranged above the through hole 4, two sides of the positioning boss 5 are provided with rapid clamps 6, the through hole 4 is arranged in the middle part of the workpiece mounting seat 3, the through hole 4 is used for air flow to pass through, when in testing, firstly, the workpiece is placed on the workpiece mounting seat 3, the workpiece is positioned above the through hole 4 by the positioning boss 5, the workpiece to be tested and the through hole 4 are ensured to be kept on the same central axis, the air flow is ensured to pass through, the workpiece to be tested is clamped and fixed by the rapid clamps 6, the rapid clamps 6 can be provided with horizontal rapid clamps or vertical rapid clamps according to actual conditions, tight butt joint between the rapid clamps 6 and the workpiece to be tested is ensured, the workpiece is kept stable in the testing process, the influence on the measuring precision caused by shaking or inclination is avoided, the rapid clamps 6 ensure that the testing process is safe, compared with the conventional flange plate bolt fastening, the flange plate bolt fastening device has higher mounting speed and improves the testing efficiency;

a clamping groove 7 is arranged at one side in the cylinder body 1, a side hole 8 is arranged at the other side of the cylinder body 1, the clamping groove 7 and the side hole 8 are symmetrically arranged, a first frame plate 9 and a second frame plate 10 are movably clamped in the clamping groove 7 and the side hole 8 respectively, a rectifying grating 11 is arranged between the first frame plate 9 and the second frame plate 10, the first frame plate 9 and the second frame plate 10 are matched with each other to form a frame structure at two sides of the rectifying grating 11, when the rectifying grating 11 is installed, the first frame plate 9 is inserted into the side hole 8 in an aligning way, the second frame plate 10 is horizontally pushed until the first frame plate 9 is clamped into the clamping groove 7, the second frame plate 10 is clamped at the side surface of the cylinder body 1, the installation and the disassembly of the rectifying grating 11 are convenient, when the rectifying grating 11 needs to be replaced according to the condition of air flow and the using condition of the rectifying grating 11, only the first frame plate 9 and the second frame plate 10 need to be pulled left and right, a limit structure can be arranged on the inner wall of the cylinder body 1, the pulling and moving condition of the whole rectifying grating 11 is limited, so that the rectifying grating is convenient to disassemble;

the rectification grating 11 divides the inner cavity of the cylinder 1 into an airflow winding chamber 12 and an airflow passing chamber 13, the airflow passing chamber 13 is positioned above the airflow winding chamber 12, the side surface of the airflow winding chamber 12 is provided with a tangential air inlet 14, the tangential air inlet 14 is tangent with the side wall of the cylinder 1, high-pressure air enters the cylinder 1 through the tangential air inlet 14 and firstly enters the airflow winding chamber 12, the airflow naturally winds due to the tangential air inlet and the arrangement of the circular cylinder 1, is uniformly dispersed in the airflow winding chamber 12 and then upwards passes through the rectification grating 11 to enter the airflow passing chamber 13, the airflow is combed into a smooth and stable flow field by the rectification grating 11 to continuously flow upwards, the airflow is discharged into the atmosphere after passing through a workpiece to be measured, the tangential air inlet 14 and the circular cylinder 1 are arranged, the generation of vortex can be reduced, a more stable flow field can be generated, and the volume of the cylinder 1 can be greatly reduced, the occupied area is saved;

the side wall of the upper part of the airflow passing chamber 13 is provided with at least three static pressure measuring points 23, the static pressure measuring points 23 are arranged at intervals, the static pressure measuring points 23 are circumferentially distributed on the side wall of the airflow passing chamber 13, the static pressure measuring points 23 are mutually connected, the airflow is measured by a testing device of the static pressure measuring points 23, and the static pressure average value of the static pressure measuring points 23 is calculated by related equipment to obtain a more accurate measured value.

When in use, a workpiece is firstly placed on a workpiece mounting seat 3, the workpiece is positioned above a through hole 4 by using a positioning boss 5, the workpiece to be measured and the through hole 4 are ensured to be kept on the same central axis, the air flow is ensured to pass through, the workpiece to be measured is clamped and fixed by using a rapid clamp 6, high-pressure air enters the barrel 1 through a tangential air inlet 14 and firstly enters an air flow winding chamber 12, the air flow naturally winds due to the tangential air inlet and the arrangement of the round barrel 1 and is uniformly dispersed in the air flow winding chamber 12, then the air flow passes through a rectifying grating 11 upwards and enters an air flow passing chamber 13, the air flow is combed into a smooth and stable flow field by using the rectifying grating 11 to continuously flow upwards, the air flow is discharged into the atmosphere after passing through the workpiece to be measured, the air flow is measured by a testing device of static pressure measuring points 23, and the static pressure average value of a plurality of static pressure measuring points 23 is calculated by related equipment, and obtaining more accurate measurement values.

Further, be provided with slot 15 on the 8 inner walls of side opening, second deckle board 10 side fixedly connected with inserted block 16, inserted block 16 pegs graft in slot 15, and slot 15 and inserted block 16 mutually support, prescribe a limit to the position of second deckle board 10, guarantee the stability of second deckle board 10 installation.

Further, second deckle board 10 bilateral symmetry fixedly connected with fixed plate 17, fixed plate 17 side is provided with guide post 18, be provided with guide way 19 on the barrel 1 lateral wall, guide post 18 is pegged graft in guide way 19, second deckle board 10 side fixedly connected with handle 22, handle 22 drags second deckle board 10 about convenient, realize the installation and the dismantlement of rectification grid 11, guide post 18 and guide way 19 mutually support, fix second deckle board 10, avoid it to drop with barrel 1, guarantee stability.

Furthermore, the side wall of the guide post 18 is provided with an annular protrusion 20, and the annular protrusion 20 improves the tight abutting between the guide post 18 and the guide groove 19, so that the guide post 18 and the guide groove 19 are prevented from loosening.

Furthermore, the side hole 8 is located on the side surface of the inner wall of the cylinder 1 and is provided with a sealing device 21, the sealing device 21 improves the sealing performance of the side wall of the cylinder 1, the air flow is ensured to pass upwards, and the measuring accuracy is prevented from being influenced.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. Large-scale work piece air flow test fairing in engine combustion chamber, including barrel (1), its characterized in that: the utility model discloses a cylinder, including barrel (1), barrel (1) bottom is provided with universal wheel (2), barrel (1) upper end fixedly connected with workpiece setting seat (3), workpiece setting seat (3) middle part is provided with through-hole (4), through-hole (4) top is provided with location boss (5), location boss (5) both sides are provided with rapid fixture (6), one side is provided with joint groove (7) in barrel (1), barrel (1) opposite side is provided with side opening (8), joint groove (7) and side opening (8) symmetry set up, the joint is movable joint respectively in joint groove (7) and side opening (8) has first framed leaf (9) and second framed leaf (10), be provided with rectification grid (11) between first framed leaf (9) and second framed leaf (10), rectification grid (11) divide into air current spiral chamber (12) and circulation cross chamber (13) with barrel (1) inner chamber, the airflow passing chamber (13) is positioned above the airflow winding chamber (12), a tangential air inlet (14) is formed in the side face of the airflow winding chamber (12), static pressure measuring points (23) are arranged on the side wall of the upper portion of the airflow passing chamber (13), and the number of the static pressure measuring points (23) is at least three and the static pressure measuring points are arranged at intervals.

2. The large workpiece air flow test fairing of the engine combustion chamber of claim 1, wherein: be provided with slot (15) on side hole (8) inner wall, second framed panel (10) side fixedly connected with inserted block (16), inserted block (16) are pegged graft in slot (15).

3. The large workpiece air flow test fairing of the engine combustion chamber of claim 1, wherein: the fixed plates (17) are symmetrically and fixedly connected to two sides of the second frame plate (10), guide columns (18) are arranged on the side faces of the fixed plates (17), guide grooves (19) are formed in the side wall of the barrel body (1), the guide columns (18) are inserted into the guide grooves (19), and handles (22) are fixedly connected to the side faces of the second frame plate (10).

4. The large workpiece air flow test fairing of the engine combustion chamber as recited in claim 3, further comprising: an annular bulge (20) is arranged on the side wall of the guide post (18).

5. The large workpiece air flow test fairing of the engine combustion chamber of claim 1, wherein: and a sealing device (21) is arranged on the side surface of the inner wall of the side hole (8) positioned in the cylinder body (1).