CN112797027A

CN112797027A - Gas compressor and gas release mechanism thereof

Info

Publication number: CN112797027A
Application number: CN202110365322.6A
Authority: CN
Inventors: 刘鹏; 杨俊�; 樊琳; 曹传军; 吴志青
Original assignee: AECC Commercial Aircraft Engine Co Ltd
Current assignee: AECC Commercial Aircraft Engine Co Ltd
Priority date: 2021-04-06
Filing date: 2021-04-06
Publication date: 2021-05-14

Abstract

The invention provides a gas compressor and a gas release mechanism thereof, wherein the gas release mechanism occupies small volume and comprises a plurality of baffles, a plurality of pinions and a bull gear. The baffles are circumferentially distributed around a central axis and are respectively arranged to rotate around the axes of the baffles; the plurality of pinions are respectively connected with the plurality of baffles; the ring gear is synchronously meshed with the plurality of pinions. The bull gear has an input side for receiving input motion, and drives the plurality of shutters to rotate synchronously through the plurality of pinions, so that the plurality of shutters can rotate to a closed state or rotate from the closed state to an open state, in the closed state, adjacent ends of adjacent shutters are overlapped, and in the open state, adjacent ends of adjacent shutters are separated from each other to open the air release port.

Description

Gas compressor and gas release mechanism thereof

Technical Field

The invention relates to a compressor, in particular to a gas release mechanism of the compressor.

Background

The air is discharged from the middle stage of the air compressor, which is a simple and effective method for improving the characteristics of the air compressor and expanding the stable working range, and can be used for preventing the surging of the front surge vortex and the rear vortex.

The specification of U.S. patent application No. US10487751B2 discloses a venting structure in which a circumferential sleeve includes one or more slots therein. The slots receive posts that project radially outward from the body structure. The slot is angled relative to the driving direction of the actuator arm. As a result of the angle and receiving post, the slot converts circular motion from the actuator to axial motion, thereby allowing the actuator arm to transition the circumferential sleeve from the first position to the second position, controlling the deflation opening open and closed.

The specification of US5048286A discloses another deflation structure in which a link ring drives each valve open or closed through a link.

Specification of PCT patent application WO2020007847a1 discloses an air bleeding structure wherein the first motor means comprise a controllable cylinder arranged to extend along an axis parallel to the axis X of the turbo-machine, a connecting rod connected to the controllable cylinder and connecting the connecting rod to the first driving ring. The first actuator comprises a horn connected to the first transmission ring, in particular to the first connecting member, a connecting rod, connecting the guide to the deflation valve.

Conventional deflation mechanisms include a deflation valve and a deflation belt. On one hand, the traditional air bleeding valve comprises a plurality of valves and control elements, the valves are opened and closed through the operation of a hydraulic or pneumatic actuator cylinder, the whole device is large in size and heavy in weight due to the fact that structures such as the actuator cylinder and a piston need to be introduced, high-pressure air of the air compressor needs to be additionally introduced to control the movement of the piston, and the performance of the air compressor is affected.

On the other hand, the air release belt comprises a belt body, air release holes, an actuating cylinder, a control element and the like, wherein the air release holes are distributed on the outer side of a certain stage of casing at the middle rear part of the air compressor along the circumferential direction and are restrained by the elastic steel belt body, the belt body is operated by the actuating cylinder, when the belt body is loosened, air flow is discharged from the air release holes, and when the belt body is tightened, air release is stopped. The tightness of the deflation belt needs to be accurately calculated, air leakage can be generated when the deflation belt is loose, the deflation belt can be broken when the deflation belt is too tight, and stepless adjustment cannot be realized on the deflation belt.

Disclosure of Invention

The invention aims to provide a gas release mechanism of a gas compressor, which occupies a small volume.

Another object of the present invention is to provide a compressor, which includes the air bleeding mechanism.

In one embodiment, the compressor bleed mechanism includes a plurality of baffles, a plurality of pinions, and a bull gear. The baffles are circumferentially distributed around a central axis and are respectively arranged to rotate around the axes of the baffles; the plurality of pinions are respectively connected with the plurality of baffles; the ring gear is synchronously meshed with the plurality of pinions. The bull gear has an input side for receiving input motion, and drives the plurality of shutters to rotate synchronously through the plurality of pinions, so that the plurality of shutters can rotate to a closed state or rotate from the closed state to an open state, in the closed state, adjacent ends of adjacent shutters are overlapped, and in the open state, adjacent ends of adjacent shutters are separated from each other to open the air release port.

In one embodiment, the end portions of the two ends of each baffle are parallel inclined surfaces, and in the closed state, the inclined surfaces of the adjacent ends of adjacent baffles overlap each other.

In one embodiment, a rubber layer for sealing is provided on the inclined surface.

In one embodiment, the baffle plates are provided with a layer of sealing material on each axial side.

In one embodiment, the ring gear is provided around the plurality of pinion gears on an inner peripheral side as a ring gear that meshes with the plurality of pinion gears, respectively.

In one embodiment, the large ring gear is provided on the outer peripheral side as an outer ring gear that is the input side that receives the input motion.

In one embodiment, the compressor bleed mechanism further comprises a motor gear, and the motor gear is meshed with the outer gear ring.

In one embodiment, the compressor comprises an outer shell, stator blades and rotor blades, the outer shell encloses a set of stator blades and a set of rotor blades which are adjacently arranged, the outer shell is provided with a relief opening, the opening and closing of the relief opening are controlled by a relief mechanism, and the relief mechanism is any one of the relief mechanisms of the compressor.

Because the scheme does not have a piston and an actuating cylinder of the traditional air release valve, and the driver is a motor, the space of an outer flow channel of the air compressor is saved, the weight is reduced, and stepless adjustment of air release flow can be realized through gear transmission.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which:

fig. 1 is a longitudinal sectional view of a portion of a compressor.

FIG. 2 is a schematic view of a large ring gear.

Fig. 3 is a schematic view of the shutter in an opened state.

Fig. 4 is a schematic view of the shutter in a closed state.

Fig. 5 is a schematic view of the transmission mechanism.

Fig. 6 is an overall schematic view of the air bleeding mechanism.

Detailed Description

The present invention is further described in the following description with reference to specific embodiments and the accompanying drawings, wherein the details are set forth in order to provide a thorough understanding of the present invention, but it is apparent that the present invention can be embodied in many other forms different from those described herein, and it will be readily appreciated by those skilled in the art that the present invention can be implemented in many different forms without departing from the spirit and scope of the invention.

It is noted that these and other figures which follow are merely exemplary and not drawn to scale and should not be considered as limiting the scope of the invention as it is actually claimed.

Fig. 1 shows a portion of an example of a compressor, which is part of an intermediate stage of the compressor. It comprises an outer shell 1 and an inner shell 2, the outer shell 1 being part of a casing and the inner shell 2 comprising a casing and/or a hub. The stator blades 3 are respectively connected with the outer shell 1 and the inner shell 2 at two ends in the height direction, and the rotor blades 4 are arranged on a hub and rotate along with the rotor. The outer casing 1 is provided with a relief opening 11, and the relief opening 11 may be provided as a plurality of openings continuously or at intervals in the circumferential direction. The bleed port 11 is located between adjacently disposed stator and rotor or between an adjacently disposed set of stator blades 3 and a set of rotor blades 4.

By controlling the opening and closing of the bleed port 11, air is bled from the intermediate stage of the compressor in the manner shown by the path 5 in fig. 1, improving the compressor characteristics and extending the stable operating range.

The compressor bleed mechanism is shown in fig. 1 and 6 and comprises a baffle 6, a pinion 7 and a bull gear 8. The large ring gear 8, as shown in fig. 2, includes a circle of internal teeth 81 and a circle of external teeth 82. As shown in fig. 5, one ring of internal teeth 81 of the ring gear 8 is used to mesh with the plurality of pinion gears 7. As shown in fig. 6, each pinion gear 7 is mounted in a ring groove 12 of the outer shell 1 via a rotary shaft 9, the ring groove 12 is provided around one circumference of the outer shell 1, the ring gear 8 is also mounted in the ring groove 12, and one outer tooth 82 thereof is exposed from the ring groove 12 and meshes with the gear 130. The motor gear is a gear as a motor output, shown as gear 130 in the figure. The gear 130 is mounted on the motor shaft of the motor 13, the motor 13 is mounted on the outer casing 1, the large gear ring 8 is driven to rotate by the gear 130, and the large gear ring 8 drives each pinion 7 to rotate around the rotating shaft 9. The rotary shaft 9 also extends into the discharge port 11, and the flapper 6 is connected in the discharge port 11 so that the flapper 6 rotates in synchronization with the pinion gear 7. One pinion 7 is coupled to one shutter 6, 20 shutters are shown in fig. 3 and 4, 10 pinions are shown in fig. 5, and the other 10 pinions are not shown in fig. 5. Fig. 3 shows the flap 6 rotated to a position opening the bleed port 11, in which bleed air corresponds to a better performance condition of the compressor. Fig. 4 shows the flap 6 rotated to a position closing the bleed orifice 11, in which the amount of bleed air is zero.

As shown in fig. 2 to 4, the axis of the ring gear 8 is collinear with the compressor or engine axis, and all the baffles 6 are also arranged on the outer casing 1 around this axis.

As shown in fig. 3 and 4, in the closed state of the discharge port 11, the adjacent ends of the adjacent flaps 6 overlap, and in the open state of the discharge port 11, the adjacent ends of the adjacent flaps 6 are separated from each other to provide a discharge passage.

As shown in fig. 3, the end of each baffle 6 is a bevel 10, and the bevels of the adjacent ends of adjacent baffles overlap in a sealing fit in the state shown in fig. 4. The inclined surfaces of the two ends of the baffle 6 are parallel to each other, and here the parallel includes the substantially parallel condition. The adjacent ends of adjacent baffles may be in other sealing engagement arrangements than by ramped engagement as shown, provided that the rotation of the baffles 6 relative to one another is not affected.

To improve the sealing performance, a rubber layer 61 is provided on the slope of each end of the baffle 6. In the state shown in fig. 4, pressure is applied between the end faces of the adjacent baffle plates 6 to each other, forcing the rubber layer 61 to be slightly deformed by compression, thereby forming an effective seal. The motor 13 is preferably provided with a self-locking mechanism, such as a worm gear mechanism, so that the force pressing the adjacent shutters 6 against each other is not transmitted to the motor in reverse, i.e., the motor 13 is not required to continuously output the driving force.

In order to further improve the sealing performance, as shown in fig. 6, a sealing material layer is provided at a contact position between both sides (right and left sides in the drawing) of the baffle 6 in the axial direction and the side wall of the relief port 11, and one embodiment of the sealing material layer includes a rubber layer and a lubricating oil. It is understood that the rubber layer and the lubricating oil may be provided in one or both of the baffle 6 and the relief port 11.

If the working state of the gas compressor changes, the gas discharge quantity requirement of the gas compressor on the gas discharge port changes, according to the embodiment, the motor 13 arranged on the outer shell 1 drives the large gear ring 8, all the small gears 7 move along with the large gear ring, all the baffle plates 6 are driven through the rotating shaft 9, and the baffle plates 6 rotate to a certain angle to meet the gas discharge requirement of the gas compressor. It can be understood that the baffle 6 can be rotated to the angle required under different compressor operating conditions, i.e. stepless regulation of the bleed air flow can be achieved.

The air compressor air release mechanism according to the embodiment does not occupy too much space of an outer flow channel because the actuating cylinder is not needed, the gear meshing is adopted, the structure is compact, the occupied space is small, and the outer side of the outer shell 1 is generally the outer flow channel surface of an aircraft engine. In addition, the air compressor air bleeding mechanism according to the embodiment does not need to loosen or tighten the air bleeding belt, so that the quality problem of breakage of the air bleeding belt is avoided, and the adjusting process is stable through gear meshing transmission. The compressor air bleeding mechanism according to the aforementioned embodiment requires only one motor to drive, and is simple in structure, since high-pressure gas or liquid is not required to maintain the movement of the piston.

In the above embodiment, the input side of the large ring gear receiving motion is one external tooth, but the present invention is not limited thereto, and for example, the motor 13 may be in friction transmission with the outer peripheral side of the large ring gear through rollers, and may finally drive the baffle 6 to rotate. In some embodiments, the motor and the transmission on the output shaft of the motor are produced, transported and sold as optional components with the compressor bleed mechanism. In some embodiments, the baffle 6 may be configured as an airfoil to direct the flow of the exiting gas.

Although the present invention has been disclosed in terms of the preferred embodiment, it is not intended to limit the invention, and variations and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. Therefore, any modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope defined by the claims of the present invention, unless the technical essence of the present invention departs from the content of the present invention.

Claims

1. Compressor air bleed mechanism, characterized by comprising:

the baffles are circumferentially distributed around a central axis and are respectively arranged to rotate around the axis of the baffles;

a plurality of pinions connected to the plurality of baffles, respectively; and

a ring gear synchronously meshed with the plurality of pinions;

the big gear ring is provided with an input side for receiving input motion, and the plurality of baffles are driven to synchronously rotate by the plurality of pinions so that the plurality of baffles can rotate to a closed state or rotate from the closed state to an open state, adjacent ends of adjacent baffles are overlapped in the closed state, and the adjacent ends of adjacent baffles are separated from each other in the open state to open the air release port.

2. An air bleed mechanism for an air compressor as in claim 1 wherein the end portions of each baffle are parallel angled surfaces and in the closed position the angled surfaces of adjacent ends of adjacent baffles overlap one another.

3. An air bleeding mechanism for an air compressor as claimed in claim 2, characterized in that said inclined surface is provided with a sealing rubber layer.

4. An air bleeding mechanism for an air compressor as claimed in claim 1, wherein each baffle is provided with a layer of sealing material on each axial side.

5. The compressor bleed mechanism of claim 1, wherein the ring gear surrounds the plurality of pinion gears, and is provided on an inner circumferential side as a ring gear that meshes with the plurality of pinion gears, respectively.

6. An air bleeding mechanism for an air compressor as defined in claim 5, wherein said large ring gear is provided on the outer peripheral side as an outer ring gear which is an input side receiving an input motion.

7. The compressor bleed mechanism of claim 6 further comprising a motor gear, the motor gear being in meshing engagement with the outer ring gear.

8. A compressor comprising an outer casing, stator blades, and rotor blades, the outer casing enclosing a set of stator blades and a set of rotor blades arranged adjacently, the outer casing being provided with a bleed port, opening and closing of the bleed port being controlled by a bleed mechanism, wherein the bleed mechanism is as defined in any one of claims 1 to 7.