Stepless adjustable anti-surge device

Abstract

The invention relates to the technical field of compression systems, in particular to a stepless adjustable anti-surge device to solve the problems that in the prior art, anti-surge equipment is limited in adjusting range and complex in structure. The stepless adjustable anti-surge device comprises a gas compressor casing, an annular cavity casing, a movable ring, a driving mechanism and a connecting piece, the annular cavity casing is arranged at the gas discharging end of the gas compressor casing through the connecting piece, an annular cavity is formed in the connecting position of the annular cavity casing and the gas compressor casing, the movable ring is arranged in the annular cavity, a plurality of first through holes are formed in the gas compressor casing, and a plurality of second through holes are formed in the gas compressor casing. A plurality of first through holes are formed in the annular cavity casing, a plurality of second through holes are formed in the annular cavity casing, a plurality of third through holes are formed in the movable ring, the driving mechanism is arranged on the gas compressor, and the driving mechanism is used for driving the movable ring to rotate to sequentially communicate or close each first through hole, each second through hole and each third through hole. The stepless adjustable anti-surge device provided by the invention is used for adjusting the gas flow in the pneumatic channel of the gas compressor as required.

Description

Technical Field

[0001] The present disclosure relates to the technical field of compression systems, and in particular to a steplessly adjustable anti-surge device. Background Art

[0002] As one of the important components of aircraft engines, the compression system is a complex mechanical equipment that integrates fluid, solid and heat. It has the technical characteristics of high speed, high pressure and high air flow velocity. Surge, as a failure mode of the compression system, seriously endangers the safe operation of the compression system. In order to ensure the safe operation of the compression system, the compression system is equipped with anti-surge equipment as needed. By timely intervening in the flow state of the gas inside the compression system, it can be ensured that the gas flow in the compression system meets working expectations.

[0003] At present, the technologies of commonly used anti-surge equipment mainly include bleed anti-surge, adjustable guide vane anti-surge and casing anti-surge. Bleed anti-surge is generally combined with airflow pressure measurement. When the airflow pressure reaches a certain ratio, the compression system surge margin is adjusted within the safe working range by opening or closing the bleed device. Some bleed anti-surge devices can also be adjusted on demand, but since there are mostly one of them distributed along the circumference, the adjustment range is limited. Adjustable guide vane anti-surge uses the angle change of the guide vane to adjust the gas flow rate, change the gas matching relationship between the various stages of the compression system, and achieve stable operation of the compression system. It has a large adjustment range, but the structure is complex and occupies a large space. Casing anti-surge is to delay the occurrence of stall by changing the airflow angle at the blade tip, and solve the surge problem of the front stage of the compressor with a small number of stages at medium and low speeds. It has a simple structure and limited effect. When working normally, it brings additional power dissipation.

[0004] Therefore, how to solve the problem of limited adjustment range and complex structure of anti-surge equipment in the prior art is one of the important issues to be solved urgently in this field. Summary of the invention

[0005] In view of this, the embodiments of the present disclosure provide a steplessly adjustable anti-surge device to solve the problems of limited adjustment range and complex structure of anti-surge equipment in the prior art.

[0006] According to one aspect of the present disclosure, there is provided a steplessly adjustable anti-surge device, comprising: a compressor casing, an annular cavity casing, a movable ring, a driving mechanism and a connecting piece, wherein the annular cavity casing is arranged at the venting end of the compressor casing through the connecting piece, an annular cavity is formed at the connection between the annular cavity casing and the compressor casing, the movable ring is arranged in the annular cavity, a plurality of first through holes are opened on the compressor casing, a plurality of second through holes are opened on the annular cavity casing, a plurality of third through holes are opened on the movable ring, and the driving mechanism is arranged on the compressor, and the driving mechanism is used to drive the movable ring to rotate to sequentially connect or close each of the first through holes, each of the second through holes and each of the third through holes.

[0007] In addition, according to the steplessly adjustable anti-surge device of one aspect of the present disclosure, an annular groove is provided on the inner side wall of the annular chamber casing, and the annular groove is adapted to the first boss of the movable ring.

[0008] According to an aspect of the steplessly adjustable anti-surge device of the present disclosure, the steplessly adjustable anti-surge device further includes a sealing member, and the movable ring is further provided with a second boss for sealing each second through hole, and the sealing member is arranged on the second boss.

[0009] According to the steplessly adjustable anti-surge device of one aspect of the present disclosure, the second boss is an arc-shaped second boss.

[0010] According to the steplessly adjustable anti-surge device of one aspect of the present disclosure, the sealing member is an elastic sealing member.

[0011] According to the steplessly adjustable anti-surge device of one aspect of the present disclosure, the number of the second through holes is equal to the number of the third through holes.

[0012] According to the steplessly adjustable anti-surge device of one aspect of the present disclosure, the spacing between each adjacent second through hole is greater than twice the circumferential dimension of each second through hole;

[0013] The interval between adjacent third through holes is greater than twice the circumferential dimension of each third through hole.

[0014] According to the steplessly adjustable anti-surge device of one aspect of the present disclosure, the rotation angle of the movable ring is α, α satisfies α<360° / (2×N), and N is the number of the third through holes.

[0015] According to the steplessly adjustable anti-surge device of one aspect of the present disclosure, the driving mechanism is at least one of an electric driving mechanism, a hydraulic driving mechanism and a pneumatic driving mechanism.

[0016] At least one of the above technical solutions adopted in the embodiments of the present disclosure can achieve the following beneficial effects: In the above steplessly adjustable anti-surge device, the annular cavity casing is arranged at the exhaust end of the compressor casing through a connecting piece, and an annular cavity is formed at the connection between the annular cavity casing and the compressor casing. The movable ring is arranged in the annular cavity, and the movable ring can be positioned. Based on this, a plurality of first through holes are provided on the compressor casing, a plurality of second through holes are provided on the annular cavity casing, and a plurality of third through holes are provided on the movable ring. The driving mechanism is provided on the compressor, and the driving mechanism is used to drive the movable ring to rotate and sequentially connect or close each first through hole, each second through hole and each <24P09461CN>

[0017] A third through hole is provided, and on this basis, the movable ring is driven to rotate by the driving mechanism to adjust each first through hole, each second through hole and each third through hole, which can not only increase the adjustment range of the steplessly adjustable anti-surge device but also meet the needs of the compressor under different working conditions, and has a simple structure, which effectively solves the problems of limited adjustment range and complex structure of the anti-surge equipment in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 The figure shows the general assembly structure diagram of the steplessly adjustable anti-surge device according to the embodiment of the present disclosure;

[0020] Figure 2 is an enlarged view of part A of the general assembly structure diagram according to an embodiment of the present disclosure;

[0021] Figure 3 is a schematic structural diagram illustrating another annular cavity according to an embodiment of the present disclosure;

[0022] Figure 4 is a side view further illustrating a steplessly adjustable anti-surge device according to an embodiment of the present disclosure;

[0023] Figure 5 It is a connection schematic diagram further illustrating the driving mechanism according to an embodiment of the present disclosure.

[0024] Reference numerals:

[0025] 1-steplessly adjustable anti-surge device, 2-compression system, 21-stator blade, 22-rotor blade, 3-compressor casing, 31-first through hole, 4-annular cavity casing, 41-annular groove, 42-second through hole, 5-movable ring, 51-first boss, 52-second boss, 53-third through hole, 6-annular cavity, 7-seal, 8-drive mechanism, 9-connector. DETAILED DESCRIPTION

[0026] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments described herein, which are instead provided for a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0027] It should be understood that the various steps described in the method embodiments of the present disclosure may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit steps.

[0028] The scope of the present disclosure is not limited in this respect.

[0029] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". Relevant definitions of other terms will be given in the description below. It should be noted that the concepts of "first", "second", etc. mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0030] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0031] The names of the messages or information exchanged between multiple devices in the embodiments of the present disclosure are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0032] As one of the important components of aircraft engines, the compression system is a complex mechanical equipment that integrates fluid, solid and heat. It has the technical characteristics of high speed, high pressure and high air flow velocity. Surge, as a failure mode of the compression system, seriously endangers the safe operation of the compression system. In order to ensure the safe operation of the compression system, the compression system is equipped with anti-surge equipment as needed. By timely intervening in the flow state of the gas inside the compression system, it can be ensured that the gas flow in the compression system meets working expectations.

[0033] At present, the technologies of commonly used anti-surge equipment mainly include bleed anti-surge, adjustable guide vane anti-surge and casing anti-surge. Bleed anti-surge is generally combined with airflow pressure measurement. When the airflow pressure reaches a certain ratio, the compression system surge margin is adjusted within the safe working range by opening or closing the bleed device. Some bleed anti-surge devices can also be adjusted on demand, but since there are mostly one of them distributed along the circumference, the adjustment range is limited. Adjustable guide vane anti-surge uses the angle change of the guide vane to adjust the gas flow rate, change the gas matching relationship between the various stages of the compression system, and achieve stable operation of the compression system. It has a large adjustment range, but the structure is complex and occupies a large space. Casing anti-surge is to delay the occurrence of stall by changing the airflow angle at the blade tip, and solve the surge problem of the front stage of the compressor with a small number of stages at medium and low speeds. It has a simple structure and limited effect. When working normally, it brings additional power dissipation.

[0034] In view of the above problems, an exemplary embodiment of the present disclosure provides a steplessly adjustable anti-surge device to solve the problems of limited adjustment range and complex structure of anti-surge equipment in the prior art.

[0035] A compressor aerodynamic stability design method according to an embodiment of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0036] Figure 1 The figure shows the general assembly structure diagram of the steplessly adjustable anti-surge device according to the embodiment of the present disclosure. Figure 2 is an enlarged view of part A of the general assembly structure diagram according to an embodiment of the present disclosure, as shown Figure 1 - Figure 2 As shown, a steplessly adjustable anti-surge device 1 comprises: a compressor casing 3, an annular cavity casing 4, a movable ring 5, a driving mechanism 8 and a connecting piece 9, wherein the annular cavity casing 4 is arranged at the exhaust end of the compressor casing 3 through the connecting piece 9, an annular cavity 6 is formed at the connection between the annular cavity casing 4 and the compressor casing 3, the movable ring 5 is arranged in the annular cavity 6, a plurality of first through holes 31 are opened on the compressor casing 3, a plurality of second through holes 42 are opened on the annular cavity casing 4, a plurality of third through holes 53 are opened on the movable ring 5, and the driving mechanism 8 is arranged on the compressor, and the driving mechanism 8 is used to drive the movable ring 5 to rotate to sequentially connect or close each of the first through holes 31, each of the second through holes 42 and each of the third through holes 53.

[0037] In practical applications, the annular cavity casing 4 is arranged at the exhaust end of the compressor casing 3 through a connecting piece 9. It is understandable that the connecting piece 9 can be a connecting piece such as a bolt or a screw, which will not be described in detail here. The steplessly adjustable anti-surge device 1 is actually located on the outer casing of the annular channel between the stator blade 21 of the compression system and the rotor blade 22 of the next stage. The connection between the annular cavity casing 4 and the compressor casing 3 forms an annular cavity 6. The movable ring 5 is arranged in the annular cavity 6, which can realize the positioning of the movable ring 5. Based on this, a plurality of first through holes 31 are provided on the compressor casing 3, a plurality of second through holes 42 are provided on the annular cavity casing 4, and a plurality of third through holes 53 are provided on the movable ring 5. It can be understood that each of the above-mentioned first through holes 31 is evenly distributed on the compressor casing 3 along the circumferential direction of the compressor casing 3, each of the second through holes 42 is evenly distributed on the annular cavity casing 4 along the circumferential direction of the annular cavity casing 4, and each of the third through holes 53 is evenly distributed on the movable ring 5 along the circumferential direction of the movable ring 5. The driving mechanism 8 is arranged on the compressor, and the driving mechanism 8 is used to drive the movable ring 5 to rotate to sequentially connect or close each first through hole 31, each second through hole 42 and each third through hole 53. On this basis, the driving mechanism 8 drives the movable ring 5 to rotate to realize the adjustment of each first through hole 31, each second through hole 42 and each third through hole 53. In the compression system 2, the compressed gas in the compressor flow channel passes through the stator blade 21 and the rotor blade 22, and is partially introduced into the annular cavity 6 through the first through hole 31. The driving mechanism 8 drives the movable ring 5 to rotate to discharge the compressed gas in the annular cavity 6 to the engine outer duct, and gradually realizes that the gas in the compression system 2 is discharged to the engine outer duct or outside the compression system at the emission stage. The steplessly adjustable anti-surge device not only has a simple structure and a large adjustment range, but also can meet the needs of the compressor under different working conditions, and effectively solves the problems of limited adjustment range and complex structure of the anti-surge equipment in the prior art.

[0038] <24P09461CN>

[0039] For example, Figure 3 is a schematic diagram illustrating the structure of another annular cavity according to an embodiment of the present disclosure, such as Figure 2 - Figure 3 As shown, the inner side wall of the annular cavity casing 4 is provided with an annular groove 41, and the annular groove 41 is adapted to the first boss 51 of the movable ring 5. It should be understood that the annular groove 41 is along the circumferential direction of the annular cavity casing 4, and the size of the opening of the annular groove 41 is greater than the thickness of the first boss 51. When the first boss 51 extends into the annular groove 41, the contact area between the first boss 51 and the annular groove 41 increases, thereby enhancing the connection stability between the annular groove 41 and the first boss 51. In addition, the annular groove 41 also has a guiding function, so that the first boss 51 moves along the circumferential direction of the annular groove 41. At the same time, the first boss 51 is adapted to the annular groove 41, which is convenient for installation and replacement.

[0040] For example, Figure 2 As shown, the steplessly adjustable anti-surge device further includes a sealing member 7 . The movable ring 5 is further provided with a second boss 52 for sealing each second through hole 42 . The sealing member 7 is arranged on the second boss 52 .

[0041] In practical applications, the movable ring 5 is provided with multiple second bosses 52 for sealing each second through hole 42. It is understandable that the second bosses 52 may be sealing members 7 such as annular sealing bosses and annular sealing rings, which are not listed here one by one. Taking multiple annular sealing bosses as an example, the sealing member 7 is provided on the second bosses 52 to achieve the seal between the movable ring 5 and the annular cavity casing 4. On this basis, the pressure of the compressed gas in the deflated ring cavity is higher than the gas pressure in the outer duct. Under the action of the internal and external pressure difference, the movable ring 5 is pressed against the inner surface of the annular cavity casing 4 through the sealing member 7 to achieve the seal between the movable ring 5 and the annular cavity casing 4.

[0042] Exemplarily, the second boss 52 is an arc-shaped second boss 52. When the arc-shaped second boss 52 contacts the inner side wall of the annular cavity casing 4, the arc-shaped second boss 52 can reduce the contact area with the inner side wall of the annular cavity casing 4, thereby reducing the movement resistance of the movable ring 5 relative to the annular cavity casing 4. On this basis, the seal 7 is an elastic seal 7. Under the action of the internal and external pressure difference of the compressor and the driving mechanism 8, the elastic seal 7 of the movable ring 5 seals the contact surface of the annular cavity casing 4 by deformation.

[0043] For example, Figure 4 is a side view further illustrating a steplessly adjustable anti-surge device according to an embodiment of the present disclosure, such as Figure 4 As shown, the number of the second through holes 42 is equal to the number of the third through holes 53, which can ensure that the movable ring 5 completely staggers or completely closes the second through holes 42 and the third through holes 53 when rotating. The gas pressure in the compressor is different when the second through holes 42 and the third through holes 53 are completely staggered or completely closed, thereby achieving air pressure regulation in the compressor. At the same time, the range of internal air pressure regulation in the compressor is increased by fully closing and fully opening, thereby meeting the air pressure regulation inside the compressor under different working conditions, and effectively solving the problem of limited adjustment range of anti-surge equipment in the prior art.

[0044] For example, Figure 4As shown, the circumferential dimension of each second through hole 42 is less than or equal to the circumferential dimension of each third through hole 53. It should be understood that the above circumferential direction is the circumferential direction of the movable ring 5. The circumferential dimension of each second through hole 42 is represented by d1, and the circumferential dimension of each third through hole 53 is represented by d2. The relationship between d1 and d2 can be designed as needed. Generally, d1≤d2 is selected. At the same time, the spacing between each adjacent second through hole 42 is greater than twice the circumferential dimension of each second through hole 42. The spacing between each second through hole 42 is represented by d3, d3>2d1. The spacing between each adjacent third through hole 53 is greater than twice the circumferential dimension of each third through hole 53. The spacing between each third through hole 53 is represented by d4, d4>2d2. The multiple first through holes 31 uniformly distributed along the circumference of the compressor casing introduce part of the compressed air in the compressor flow channel into the exhaust ring cavity. The size of each first through hole 31 is determined according to the compressor. The maximum air discharge demand of the compression stage is determined by calculation. Similarly, a plurality of second through holes 42 uniformly distributed along the circumferential direction on the annular cavity casing 4 discharge the compressed air in the annular cavity 6 to the outer duct. The size of each second through hole 42 is determined by calculation of the maximum air discharge demand of the compression stage. Therefore, each third through hole 53 on the movable ring 5 is opened to the required aperture size. While ensuring that each second through hole 42 and each third through hole 53 are completely closed and staggered, the gas in the compressor casing can be discharged to the outer duct as needed.

[0045] Exemplarily, the rotation angle of the movable ring 5 is α, which is represented by the circumferential angle of the second through hole 42. Since the spacing between each adjacent second through hole 42 is greater than twice the circumferential size of each second through hole 42, the spacing between each second through hole 42 is represented by d3, d3>2d1, so α satisfies α<360° / (2×N). Due to the number of second through holes 42 and the number of third through holes 53, N can represent both the number of second through holes 42 and the number of third through holes 53, and N is a positive integer.

[0046] For example, Figure 5 is a schematic diagram further illustrating the connection of the driving mechanism 8 according to an embodiment of the present disclosure. Figure 5 As shown, the driving mechanism 8 is at least one of an electric driving mechanism 8 , a hydraulic driving mechanism 8 and a pneumatic driving mechanism 8 .

[0047] In practical applications, such as Figure 5 As shown, taking the pneumatic drive as an example, the driving mechanism 8 drives the movable ring 5 to move along the circumferential direction of the annular groove 41. The driving mechanism 8 and the movable ring 5 are connected by a hinge. The driving mechanism 8 includes a connecting rod mechanism and a cylinder. The cylinder is fixed on the outer duct of the compression system. The connecting rod mechanism and the cylinder are connected by a hinge. The connecting rod mechanism realizes the spatial connection between the movable ring 5 and the cylinder, and transmits the force on the cylinder to the movable ring 5, converting the linear motion of the cylinder into the rotation on the movable ring 5. <24P09461CN>

[0048] Movement. The design or selection of the cylinder should be based on the force that the movable ring 5 needs to overcome for circumferential movement and the design structure of the connecting rod system. The force that the cylinder can provide should be greater than the force required for the movable ring 5 to move. The movable ring 5 should achieve position self-locking under the action of internal and external pressure difference force and friction force. The cylinder should ensure that the movable ring 5 can be locked in position.

[0049] The above descriptions are only some embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, a technical solution formed by replacing the above features with the technical features with similar functions disclosed in the present disclosure (but not limited to).

[0050] Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A steplessly adjustable anti-surge device, characterized in that: include: A compressor casing, an annular cavity casing, a movable ring, a driving mechanism and a connecting piece, wherein the annular cavity casing is arranged at the venting end of the compressor casing through the connecting piece, an annular cavity is formed at the connection between the annular cavity casing and the compressor casing, the movable ring is arranged in the annular cavity, a plurality of first through holes are opened on the compressor casing, a plurality of second through holes are opened on the annular cavity casing, a plurality of third through holes are opened on the movable ring, and the driving mechanism is arranged on the compressor, and the driving mechanism is used to drive the movable ring to rotate and sequentially connect or close each of the first through holes, each of the second through holes and each of the third through holes.

2. The steplessly adjustable anti-surge device according to claim 1, characterized in that: An annular groove is provided on the inner side wall of the annular chamber casing, and the annular groove is adapted to the first boss of the movable ring.

3. The steplessly adjustable anti-surge device according to claim 1 is characterized in that: The steplessly adjustable anti-surge device further comprises a sealing member, and the movable ring is further provided with a second boss for sealing each of the second through holes, and the sealing member is arranged on the second boss.

4. The steplessly adjustable anti-surge device according to claim 3 is characterized in that: The second boss is an arc-shaped second boss.

5. The steplessly adjustable anti-surge device according to claim 3 is characterized in that: The sealing element is an elastic sealing element.

6. The steplessly adjustable anti-surge device according to any one of claims 1 to 5, characterized in that: The number of the second through holes is equal to the number of the third through holes.

7. The steplessly adjustable anti-surge device according to claim 6, characterized in that: The spacing between adjacent second through holes is greater than twice the circumferential dimension of each second through hole; The distance between adjacent third through holes is greater than twice the circumferential dimension of each third through hole.

8. The steplessly adjustable anti-surge device according to claim 1, characterized in that: The rotation angle of the movable ring is α, and α satisfies α<360° / (2×N), where N is the number of the third through holes.

9. The steplessly adjustable anti-surge device according to claim 1, characterized in that: The driving mechanism is at least one of an electric driving mechanism, a hydraulic driving mechanism and a pneumatic driving mechanism.

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