CN114227178A

CN114227178A - Manufacturing method of low-hysteresis brush type sealing device

Info

Publication number: CN114227178A
Application number: CN202210003296.7A
Authority: CN
Inventors: 胡娅萍; 李世明; 李朋飞; 崔雪超; 张曙
Original assignee: Nanjing University of Aeronautics and Astronautics
Current assignee: Nanjing University of Aeronautics and Astronautics
Priority date: 2022-01-05
Filing date: 2022-01-05
Publication date: 2022-03-25

Abstract

The invention relates to a method for manufacturing a low-hysteresis brush type sealing device, which comprises the following steps: (1) preparing a rear baffle plate and a flow shielding plate; (2) bundling the brush wires: cutting the straightened brush wires into equal lengths, and then bonding the fixed number of brush wires into brush wire bundles with regular shapes; (3) arranging brush tows; (4) removing glue and fixing the arrangement angle of the brush filaments; (5) preparing and welding a front baffle: the front baffle is divided into two parts to be processed and respectively welded; (6) processing and processing the appearance; (7) inner hole linear cutting: and cutting the inner hole by adopting slow-feeding wire cutting equipment, wherein the precision is 0.02 mm. The manufacturing method of the low-hysteresis brush type seal is simple in process and strong in operability, effectively reduces manufacturing cost, and ensures manufacturing quality and precision of the low-hysteresis brush type seal.

Description

Manufacturing method of low-hysteresis brush type sealing device

Technical Field

The invention relates to the technical field of aeroengine sealing, in particular to a manufacturing method of a low-hysteresis brush type sealing device.

Background

The brush seal is a contact sealing technology capable of accommodating the runout or expansion of a rotor and maintaining good sealing performance, and is applied to the field of sealing of aircraft engines, gas turbines and steam turbines for suppressing gas leakage from a high-pressure side to a low-pressure side.

Under the action of upstream and downstream pressure difference of the traditional brush seal, when the rotor jumps or expands, the brush bundle is pushed outwards by the rotor; when the rotor is restored, the friction force between the brush wires and between the brush bundles and the rear baffle can prevent the brush wires from being restored, so that gaps can be formed between the brush bundles and the rotor, the leakage amount is increased, the sealing performance is reduced, and the phenomenon is called as 'hysteresis effect'. In order to reduce the hysteresis effect, a low hysteresis brush type sealing structure is developed, namely, an annular decompression cavity is arranged between the brush bundle and the rear baffle.

The problems of irregular and bent brush wires and poor dimensional accuracy of the arrangement angle and the inner diameter of the brush wires exist when the low-hysteresis brush seal is processed by the existing processing and manufacturing mode, and the cost is too high when small-batch production is carried out.

Disclosure of Invention

In order to solve the above-mentioned defects in the prior art, the invention discloses a method for manufacturing a low-hysteresis brush type sealing device, which effectively improves the product quality and greatly reduces the cost of small-batch production, and comprises the following steps:

step one, preparing a rear baffle and a flow shielding plate: processing the rear baffle plate through a lathe and a grinding machine according to specific requirements, and processing the baffle plate through a wire cutting device;

step two, bundling the brush filaments: straightening the brush wires, then cutting the brush wires into equal lengths, and bonding the brush wires with fixed number into brush wire bundles with regular shapes by using glue;

step three, arranging the brush tows: uniformly arranging a certain number of brush wire bundles obtained by calculation on the rear baffle according to the arrangement angle direction of the brush wires;

step four, removing glue and fixing the arrangement angle of the brush filaments: placing a rear baffle, the arranged brush wire bundles, a clamp and the like in an organic solution, removing glue remained when the brush wires are bundled, and fixing the arrangement angle of the brush wires at the inner diameter of a brush ring by adopting a circular plate with the corresponding inner diameter of the free end of the brush wires;

step five, preparing and welding a front baffle: splitting the front baffle into two parts for processing and respectively welding;

step six, appearance treatment and processing: finishing the matching surface by adopting machine tool processing equipment;

step seven, inner hole linear cutting: and cutting the inner hole by adopting slow-feeding wire cutting equipment, wherein the precision is 0.02 mm.

Further, in the second step, the brush wires with fixed number are fixed into regular shape by a clamp and adhered by glue.

Further, in the third step, the rear baffle is clamped on the fixture, then the plug piece with the thickness consistent with the axial width of the pressure reduction cavity is placed and fixed in the pressure reduction cavity, the brush silk bundles are guaranteed to be arranged on a plane, and finally a certain number of the brush silk bundles obtained through calculation are evenly arranged on the rear baffle according to the brush silk arrangement angle direction.

Further, in the fifth step, the front baffle is split into an outer ring and an inner ring for processing: the method comprises the following steps of clamping and pressing a front baffle outer ring, a flow shielding plate, a brush wire bundle and a rear baffle through a clamp, fixing the front baffle outer ring, the flow shielding plate, the brush wire bundle and the rear baffle on rotary equipment, welding the parts together, taking down the clamp, clamping a front baffle inner ring, and performing water-cooling spot welding on two parts of the front baffle at a joint.

And further, in the seventh step, the inner hole linear cutting is automatically processed by adopting a slow-moving wire cutting device, so that the welding adhesion of the brush wires with the inner diameter and the overhigh temperature is prevented.

Compared with the prior art, the invention has the beneficial effects that: the manufacturing method of the low-hysteresis brush type sealing device is simple in process, strong in operability, capable of effectively reducing manufacturing cost and guaranteeing manufacturing quality and precision of the low-hysteresis brush type seal.

Drawings

FIG. 1 is a manufacturing flow diagram of the present invention.

Fig. 2 is an overall configuration diagram of a low hysteresis brush seal.

FIG. 3 is a schematic view of the clamping and welding of the outer ring portion of the front baffle plate with the brush bundle and the back baffle plate of the present invention.

FIG. 4 is a schematic view of the clamping and welding of the inner ring portion and the outer ring portion of the front baffle plate of the present invention.

FIG. 5 is a schematic view of the brush seal for wire cutting clamped with the front and rear clamps of the present invention.

In the figure: 1. a front baffle; 2. a flow shielding plate; 3. brushing; 4. a tailgate; 5. a decompression chamber; 6. a front baffle outer ring; 7. a front clamp; 8. a gasket; 9. a rear clamp; 10. welding the outer diameter; 11. a front baffle inner ring; 12. a front clamp; 13. the welding position of the inner ring and the outer ring of the front baffle plate; 14. and (4) a rear clamp.

Detailed Description

The present invention will be described in detail below by way of examples with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1, the method for manufacturing a low hysteresis brush type sealing device of the present invention comprises the steps of:

step one, preparing a rear baffle and a flow shielding plate: machining the rear baffle 5 by adopting a lathe, carrying out flat grinding on the surface of the rear baffle by using a grinding machine to ensure the flatness, and machining the flow shielding plate by adopting linear cutting equipment;

step two, bundling the brush filaments: firstly, straightening the brush wires, then cutting the brush wires into equal lengths, fixing a fixed number of brush wires into a regular shape through a clamp, and finally, adhering the brush wires into a brush wire bundle with a regular shape by using glue;

step three, arranging the brush tows: firstly, fixing a rear baffle plate 5 on a rear clamp 9, fixing a metal gasket 8 with the same width size as the decompression cavity 4 on the rear baffle plate 5 to ensure the same plane, and then uniformly arranging a certain number of brush silk bundles on the rear baffle plate according to the brush silk arrangement angle direction;

step four, removing glue and fixing the arrangement angle of the brush filaments: integrally placing the brush filament bundles arranged in the third step, the metal gasket 8 rear baffle 5 and the clamp 9 in an organic solution, removing residual glue when the brush filaments are bundled, mutually fusing the brush filaments into a uniform loose state from the bundled state, properly adjusting the brush filaments manually in the process to ensure that the brush filaments are uniformly arranged in the whole circumferential range, and placing the free ends of the brush filaments at the inner diameter of a brush ring to fix an angle corresponding to the circular plate with the inner diameter, so as to ensure the arrangement angle of the brush filaments;

step five, preparing and welding a front baffle: machining a front baffle outer ring 6 and an inner ring 11 by using a lathe, performing flat grinding by using a grinding machine, taking out the integral part obtained in the fourth step from an organic solution, placing and drying the integral part, then pressing and clamping the front baffle outer ring 6, the baffle plate 2, the brush bundle 3 and the rear baffle 5 by using a front clamp 7 and a rear clamp 9, as shown in figure 3, clamping the clamped integral part on a rotating device, enabling the rotating device to slowly rotate along the central shaft of the brush ring, and welding the parts together at an outer diameter welding part 10; after welding, the front clamp 7 is taken down after the front baffle inner ring 11 is fully cooled, then the front baffle inner ring 11 and the welding part are separately clamped together through the front clamp 12, as shown in figure 4, the front baffle inner ring and the welding part are placed in cold water, and the front baffle and the rear baffle are welded together at the welding part 13 of the front baffle inner ring and the outer ring by adopting a dense spot welding mode;

step six, appearance treatment and processing: after the welding is finished, clamping the front baffle plate on a grinding machine, carrying out fine grinding on the outer diameter welding position, then carrying out flat grinding on the upper surface of the front baffle plate to remove welding slag caused by welding so that the matching surface meets the assembly requirement, and finally removing surface oxidation caused by welding in an acid washing mode to ensure the attractiveness of the surface and finish the primary manufacturing of the low-hysteresis brush type seal;

step seven, inner hole linear cutting: and after finishing the shape processing and machining in the step six, taking out the metal gasket 8, clamping the preliminarily machined brush seal together with the front clamp 12 and the rear clamp 14, fixing the brush seal on slow-speed wire cutting equipment as shown in fig. 5, and performing wire cutting on the inner hole brush wire bundle according to the designed size to manufacture the low-hysteresis brush seal meeting the requirement.

The above is an embodiment of the present invention. The above embodiments are only for clearly describing the manufacturing method of the low hysteresis brush type sealing device, and are not intended to limit the scope of the present invention, which is defined by the claims, and any modifications, substitutions and the like using the contents of the specification and the drawings of the present invention are within the scope of the present invention.

Claims

1. A method of making a low hysteresis brush seal assembly wherein the brush seal includes at least a front dam, a baffle, a bundle of brush filaments and a back dam, comprising the steps of:

2. The method of manufacturing a low hysteresis brush type sealing device according to claim 1, wherein: and step two, bundling the brush wires, fixing the brush wires with fixed number into a regular shape by adopting a clamp, and adhering by using glue.

3. The method of manufacturing a low hysteresis brush type sealing device according to claim 1, wherein: and the third step of arranging the brush silk bundles comprises the steps of clamping the rear baffle plate on a clamp, then placing and fixing the plug piece with the thickness consistent with the axial width of the pressure reduction cavity in the pressure reduction cavity, ensuring that the brush silk bundles are arranged on a plane, and finally uniformly arranging a certain number of calculated brush silk bundles on the rear baffle plate according to the arrangement angle direction of the brush silk.

4. The method of manufacturing a low hysteresis brush type sealing device according to claim 1, wherein: and the preparation and welding process of the front baffle in the step five comprises the following steps of splitting the front baffle into an outer ring and an inner ring for processing: the method comprises the following steps of clamping and pressing a front baffle outer ring, a flow shielding plate, a brush wire bundle and a rear baffle through a clamp, fixing the front baffle outer ring, the flow shielding plate, the brush wire bundle and the rear baffle on rotary equipment, welding the parts together, taking down the clamp, clamping a front baffle inner ring, and performing water-cooling spot welding on two parts of the front baffle at a joint.

5. The method of manufacturing a low hysteresis brush type sealing device according to claim 1, wherein: and the seven-step inner bore linear cutting is automatically processed by adopting a slow-moving wire cutting device, so that the brush wires with the inner diameters are prevented from melting and adhering due to overhigh temperature.