Stator assembly with bleed holes and compressor

Abstract

The application discloses a static subassembly with a gas leading hole and a compressor, and the static subassembly with the gas leading hole comprises a half casing and a plurality of integrated static bushing rings, the integrated static bushing ring comprises a bushing and a static ring, the bushing is integrated on the static ring and arranged on the half casing at a blade tip of a rotor blade, and an outer wall surface of the integrated static bushing ring is provided with a reinforcing structure; the integrated static bushing ring and the half casing are provided with a gas leading channel which is in communication with each other, and the gas leading channel is used for leading the airflow from the integrated static bushing ring at a hot end to the integrated static bushing ring at a cold end through the insertion slot and the half casing so as to coordinate the expansion deformation of the static blade and the half casing. Compared with a conventional stainless steel casing, the weight of the application is reduced by more than 30%, the blade containment coefficient is increased by more than 10% compared with the conventional casing, the non-design point blade tip cold state gap caused by the deformation of the casing is reduced by more than 20% compared with the conventional casing, and the performance of the aero-engine compressor is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engines, in particular to a stator assembly with bleed holes and a compressor. BACKGROUND

[0002] The existing half-type axial casing is generally made of stainless steel, and graphite coating is sprayed on the casing corresponding to the blade tips of the rotor first-stage blade disc 1 and second-stage blade disc 4 to prevent blade scraping. Referring to Figure 1 , Figure 1 The arrow in the figure indicates the airflow direction in the casing. The first-stage stator ring 2 and the second-stage stator ring 5 are installed on the axial casing 3 through T-shaped grooves. The existing half-type axial casing has the following problems:

[0003] 1. The volume of the axial casing in the aero-engine or test piece adopting the half-type axial casing structure accounts for a high proportion of the total volume of the whole machine, and the use of high-density stainless steel material will result in a heavy weight of the whole machine; 2. If the existing casing wants to improve the containment when the rotor blade disc breaks, the material must be replaced or the casing wall thickness must be increased, resulting in a larger weight of the whole machine; 3. For the axial casing made of titanium alloy material, only the graphite coating is sprayed on the casing corresponding to the rotor blade tips, and once the casing is seriously scraped with the rotor disc also made of titanium alloy material, titanium fire is likely to occur, and the casing and the rotor are likely to be ablated at the same time. 4. In the working state of the compressor rotor, the blades are deformed in the axial and radial directions under the influence of aerodynamic force, temperature and centrifugal force in high-speed operation of the impeller, resulting in a smaller gap between the rotor and the stator, and the blade tips are likely to be scraped with the casing, causing titanium fire. The current practice is to design a larger cold gap to ensure that the rotor and the stator do not collide in operation. SUMMARY

[0004] The present application provides a stator assembly with bleed holes and a compressor to solve the technical problem that the rotor blade is deformed in the radial direction in high-speed operation of the existing compressor rotor impeller, making the blade tip easy to be scraped with the casing.

[0005] According to one aspect of the present application, a stator assembly with bleed holes is provided, which comprises a half casing and a plurality of integrated stator sleeve rings, the integrated stator sleeve rings are installed on the insertion groove of the half casing, the integrated stator sleeve ring comprises a sleeve and a stator blade, the stator blade is installed on the sleeve, the sleeve is arranged at the blade tip of the rotor blade on the half casing and forms a gap with the rotor blade, and the outer wall surface of the integrated stator sleeve ring is provided with a reinforcing structure; the integrated stator sleeve ring, the insertion groove and the half casing are provided with bleed channels in communication with each other, the bleed channels are used to guide the airflow from the integrated stator sleeve ring at the hot end to the integrated stator sleeve ring at the cold end through the insertion groove and the half casing to make the stator blade and the half casing deform coordinately.

[0006] Further, the several stages of the integrated stator bushing ring at least include a first stage integrated stator bushing ring for the cold end of the compressor and a second stage integrated stator bushing ring for the hot end of the compressor, the split casing is provided with a first insertion slot and a second insertion slot; the first stage integrated stator bushing ring is installed on the first insertion slot, and the second stage integrated stator bushing ring is installed on the second insertion slot; the second stage integrated stator bushing ring is provided with an air inlet hole in the radial direction and communicated with the second insertion slot, the first stage integrated stator bushing ring is provided with a first air passage hole on the end face of the stopper near the second stage integrated stator bushing ring, and the second stage integrated stator bushing ring is provided with a second air passage hole on the end face of the stopper near the first stage integrated stator bushing ring; the split casing is provided with a third air passage hole communicated with the first air passage hole and the second air passage hole; the outer wall of the split casing is provided with an air outlet hole communicated with the first insertion slot; the air inlet hole, the first air passage hole, the third air passage hole, the second air passage hole and the air outlet hole form an air bleed passage.

[0007] Further, the air bleed passage is provided with several air bleed passages, and the several air bleed passages are uniformly arranged along the circumference of the stator assembly.

[0008] Further, the diameter of the air inlet hole and the air outlet hole is 1.5-8 mm.

[0009] Further, the cross section of the first air passage hole, the third air passage hole and the second air passage hole is a waist type.

[0010] Further, the inner wall of the bushing corresponding to the blade tip of the rotor wheel is provided with a graphite coating.

[0011] Further, the bushing is made of stainless steel, and the split casing and the rotor wheel are made of titanium alloy.

[0012] Further, the reinforcing structure of the outer wall of the integrated stator bushing ring is a reinforcing rib.

[0013] Further, the thickness of the reinforcing rib is 30%-80% of the height of the insertion slot.

[0014] According to another aspect of the present application, a compressor is also provided, which comprises the above-mentioned stator assembly with air bleed holes.

[0015] The present application has the following advantages:

[0016] 1. In the present application, the bushing and stator ring are integrated to achieve the purpose of integrated lightweight design of the stator assembly, the outer wall surface of the integrated stator bushing ring is provided with reinforcing structure for improving the strength and containment of the stator assembly, which can contain the dropped blade at the highest working speed, avoid large rupture and distortion of the stator assembly; At the same time, the integrated stator bushing ring, the insertion slot and the half machine case are provided with air guide channels which are communicated with each other, the air guide channels are used to guide the airflow from the integrated stator bushing ring with high temperature to the integrated stator bushing ring with low temperature, and the stator blades in the integrated stator bushing ring and the half machine case with low temperature are heated, so that the stator blades in the stator assembly are deformed in working, and the deformation trend is the same as that of the rotor blades, thereby keeping the gap between the rotor and the stator within the set range, so as to avoid the deformation of the blades in the impeller under the influence of aerodynamic force, temperature and centrifugal force in high speed working, which leads to the easy scraping between the blade tip and the machine case, and generates titanium fire, thereby a smaller cold gap can be designed, and the performance of the compressor in non-working state is improved.

[0017] 2. The stator assembly with air guide hole of the present application has a weight reduction of more than 30% compared with the conventional stainless steel machine case, the blade containment coefficient is increased by more than 10% compared with the conventional machine case, the non-design point blade tip cold gap caused by the deformation of the machine case is reduced by more than 20% compared with the conventional machine case, and the performance of the compressor is effectively improved.

[0018] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described in detail below. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide further understanding of the present application, the schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0020] Figure 1 It is a schematic diagram of the structure of the existing half type axial flow machine case;

[0021] Figure 2 It is an exploded schematic diagram of the structure of the half type axial flow machine case of the present application;

[0022] Figure 3 It is a schematic diagram of the structure of the reinforcing rib on the bushing Figure 1 ;

[0023] Figure 4 It is a schematic diagram of the structure of the reinforcing rib on the bushing Figure 2 ;

[0024] Figure 5 It is a schematic diagram of the structure of the air guide channel;

[0025] Figure 6 Cross-sectional view of the air hole for the end face of the bushing;

[0026] Figure 7 Schematic view of the connecting structure of the bushing and the insertion slot;

[0027] Figure 8 Schematic view of the anti-rotation structure on the half casing Figure 1 ;

[0028] Figure 9 Schematic view of the anti-rotation structure on the half casing Figure 2 ;

[0029] Figure 10 Schematic view of the anti-rotation structure on the integrated stator bushing Figure 1 ;

[0030] Figure 11 Schematic view of the anti-rotation structure on the integrated stator bushing Figure 2 ;

[0031] Figure 12 Top view of the anti-rotation structure on the integrated stator bushing;

[0032] Figure 13 Schematic view of the structure of the integrated stator bushing.

[0033] In the figure: 1 - first blade disc; 2 - first stator ring; 3 - axial flow casing; 4 - second blade disc; 5 - second stator ring; 6 - first integrated stator bushing ring; 61 - first insertion slot; 62 - second air hole; 7 - half casing; 71 - third air hole; 72 - air outlet hole; 8 - second integrated stator bushing ring; 81 - second insertion slot; 82 - air inlet hole; 83 - first air hole; 9 - bushing. DETAILED DESCRIPTION

[0034] The embodiments of the present application are described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways as defined and covered by the following.

[0035] Reference is made to Figures 2 to 13The embodiment of the first aspect of the present application provides a stator assembly with air injection holes, which comprises a half casing 7 and a plurality of integrated stator sleeve rings, the plurality of integrated stator sleeve rings are installed on the insertion slot of the half casing 7, the integrated stator sleeve ring comprises a sleeve 9 and a stator blade 10, the stator blade 10 is installed on the sleeve 9, the sleeve 9 is arranged at the tip of the rotor blade of the half casing and forms a gap with the rotor blade, and the outer wall surface of the integrated stator sleeve ring is provided with a reinforcing structure; the integrated stator sleeve ring, the insertion slot and the half casing 7 are provided with air injection channels in communication with each other, and the air injection channels are used for guiding the airflow from the integrated stator sleeve ring at the hot end to the integrated stator sleeve ring at the cold end through the insertion slot and the half casing to make the stator blade and the half casing 7 deform coordinately.

[0036] Specifically, the half casing 7 and the rotor impeller of the present application adopt titanium alloy material to meet the requirement of lightweight design, and graphite coating is arranged on the inner side of the sleeve to prevent titanium fire caused by scraping and grinding between the rotor and the stator. The number of the integrated stator sleeve rings can be two, three, four or more, and the plurality of integrated stator sleeve rings are installed on the insertion slot of the half casing 7, preferably, the insertion slot is a T-shaped slot. Referring to Figure 7 , a gap is arranged at the connection between the integrated stator sleeve ring and the insertion slot. More specifically, a groove is milled at the T-shaped slot of the longitudinal installation edge of the half casing 7 (see Figure 8 and Figure 9 ), the groove depth D1 is 4-10 mm, and the groove width D2 is 3-6 mm; a boss is arranged on the installation edge of the integrated stator sleeve ring (see Figure 10 , Figure 11 and Figure 12 ), the boss width d1 is 4-10 mm, the boss height d2 is 2-5 mm, and d2 needs to be less than D2, so that the integrated stator sleeve ring can be installed into the groove on the T-shaped slot through the boss and be clamped with each other. Further, the first integrated stator sleeve ring and the second integrated stator sleeve ring are installed in place through the T-shaped slot on the half casing 7. Referring to Figure 13 , the outer diameter of the installation edge of the integrated stator sleeve ring needs to ensure a diameter gap of 0.02-0.1 mm with the insertion slot of the half casing 7, and the inner diameter of the installation edge of the integrated stator sleeve ring needs to ensure a diameter gap of 0.05-0.2 mm with the half casing 7, and the axial fitting distance X1 of the installation edge of the integrated stator sleeve ring and the half casing 7 needs to ensure 3-10 mm. The fitting sizes described above are ensured by the machining design of the matched parts, and the gap of 0.02-0.1 mm, 0.05-0.2 mm and 3-10 mm is to ensure that the sleeve can be successfully installed into the T-shaped slot during assembly, too small gap will cause jamming during assembly, and too large gap will cause the sleeve to shake during use, causing safety hazards.

[0037] The integrated stator bushing ring, the insertion slot and the half casing 7 are sequentially provided with air guide channels in communication with each other, a plurality of groups of air guide channels are arranged on the stator assembly, preferably, the air guide channels can be arranged as 15-30 groups, more preferably, the air guide channels are arranged on two adjacent integrated stator bushing rings, the air guide channels are used to guide the airflow from the integrated stator bushing ring at the hot end to the insertion slot on the integrated stator bushing ring at the cold end through the insertion slot and the half casing between the two adjacent insertion slots, to warm the first-stage stator blade with lower temperature, and finally the airflow flows out from the outer wall surface of the casing to coordinate the expansion deformation of the stator blade and the half casing 7, to avoid the scraping of the part of the blade tip of the rotor wheel and the casing.

[0038] The integrated stator bushing ring is integrated with the stator ring, the purpose of the integrated lightweight design of the stator assembly is achieved, the outer wall surface of the integrated stator bushing ring is provided with a reinforcing structure for improving the strength and containment of the casing, and the casing can contain the dropped blade at the highest working speed, to avoid large rupture and distortion deformation of the casing.

[0039] Further, the integrated stator bushing ring includes a bushing and a stator blade, the integrated stator bushing ring is installed on the insertion slot of the half casing, and the bushing is arranged at the blade tip of the rotor blade on the half casing and forms a gap with the rotor blade. It can be understood that the bushing in the present application extends to the blade tip of the rotor blade on the basis of the stator ring in the prior art. Preferably, the bushing is made of stainless steel and is provided with a graphite coating to prevent titanium fire caused by scraping between the rotor blade and the bushing.

[0040] Since smaller rotor-stator gap can obtain better aerodynamic performance in the working of the compressor, it is necessary to ensure smaller rotor-stator gap as much as possible under the condition of ensuring safety. With the increase of the speed of the compressor (the increase of the centrifugal force), the working state of the compressor becomes large (the increase of the aerodynamic force and the increase of the temperature), the rotor blade is deformed (mainly radial elongation) under the action of the aerodynamic force, the temperature and the centrifugal force, which leads to the decrease of the radial gap of the rotor-stator. The compressor is designed with a design speed, and the state when working at the design speed is called design state, and the rotor-stator gap can reach the design gap (generally 0.2-0.3mm) when the compressor reaches the design speed. Therefore, during assembly, the radial deformation of the rotor under the action of the aerodynamic force, the temperature and the centrifugal force is usually added to the gap at the design state (0.2-0.3mm) as the cold state (static state / rotating speed is 0) gap, which is also the assembly gap. If the rotor-stator gap is designed to be too small at the cold state, scraping will occur at the working state. The aerodynamic performance of the compressor at the non-design state (other rotating speeds than the design speed) is also very important, so reducing the cold state gap can also improve the performance of the compressor at the non-working state.

[0041] Therefore, the present invention provides interconnected air intake channels on the integrated stator bushing ring, the insertion slot, and the half-casing in sequence. The air intake channels are used to guide the airflow from the high-temperature integrated stator bushing ring to the low-temperature integrated stator bushing ring, heating the stator blades in the low-temperature integrated stator bushing ring. This causes the stator blades and the half-casing to expand due to heat, and their expansion trend is the same as that of the rotor. This avoids the blades from deforming due to aerodynamic forces, temperature, and centrifugal forces during high-speed operation, which could lead to some blade tips easily scraping against the casing and generating ignition. Furthermore, it allows for the design of a smaller cold clearance, improving the compressor performance in non-operating states.

[0042] In an embodiment of the present invention, see Figure 5 , Figure 5 The arrows indicate the flow direction of the high-temperature, high-pressure airflow. The half-casing 7 has air intake channels arranged in units of at least two adjacent integrated stator bushing rings, and the stator assembly with air intake holes has several integrated stator bushing rings. In this embodiment, air intake channels are arranged in units of two adjacent integrated stator bushing rings. The high-temperature, high-pressure airflow enters the insertion slot from one of the integrated stator bushing rings 6, then enters the half-casing between two adjacent insertion slots, and then enters the insertion slot of the lower-temperature integrated stator bushing ring 6, heating the lower-temperature stator blade. Finally, it flows out from the half-casing wall on the insertion slot corresponding to that integrated stator bushing ring. In practical applications, air intake channels can also be arranged in units of three or more integrated stator bushing rings, and the coordinated deformation of the blades and casing can be controlled by calculating and introducing a reasonable amount of high-temperature, high-pressure airflow. In this embodiment, the bleed air channel is set up in units of two-stage integrated stator bushing rings to ensure that the bleed air volume provided is not too large. If only one airflow is used in the entire compressor to heat the blades on the multi-stage integrated stator bushing rings at the same time, the bleed air volume will increase significantly, which can easily lead to a decrease in compressor performance.

[0043] In an embodiment of the present invention, see Figure 5, if several levels of the integrated stator bushing rings, at least one first integrated stator bushing ring 6 for the cold end of the compressor and a second integrated stator bushing ring 8 for the hot end of the compressor are provided, the half casing 7 is provided with a first insertion slot 61 and a second insertion slot 81; the first integrated stator bushing ring 6 is installed on the first insertion slot 61, and the second integrated stator bushing ring 8 is installed on the second insertion slot 81; the second integrated stator bushing ring 8 is provided with an air inlet hole 82 in the radial direction and communicated with the second insertion slot 81, and the first integrated stator bushing ring 8 is provided with a first air passage hole 83 on the end face of the mouth close to the first integrated stator bushing ring, and the second integrated stator bushing ring 6 is provided with a second air passage hole 62 on the end face of the mouth close to the second integrated stator bushing ring, and the half casing is provided with a third air passage hole 71 communicated with the first air passage hole 83 and the second air passage hole 62; the outer wall of the half casing 7 is provided with an air outlet hole 72 communicated with the first insertion slot 61. The number of the air inlet holes 82 can be consistent with or less than the number of the stator blades, and the air inlet holes 82 and the stator blades are arranged along the circumference of the stator ring, preferably the air inlet holes 82 are arranged at the middle position of the integrated stator bushing ring, so that the air flow from the air inlet holes 82 can smoothly enter the insertion slot without being blocked. The number of the air inlet holes 82, the first air passage hole 83, the third air passage hole 71, the second air passage hole 62 and the air outlet hole 72 is the same. By arranging the first air passage hole 83, the third air passage hole 71 and the second air passage hole 62 communicated with each other on the end face of the mouth of the second integrated stator bushing ring, the half casing 7 and the first integrated stator bushing ring, the air flow from the air inlet hole 82 into the second insertion slot 81 can pass through the first air passage hole 83, the third air passage hole 71 and the second air passage hole 62 into the first insertion slot 61, and then the air flow flows out from the air outlet hole 72, thereby warming the stator blades on the first integrated stator bushing ring 6 and the corresponding half casing 7, so that the stator blades and the half casing 7 expand by heating, and the expansion trend is the same as that of the rotor, thereby a smaller cold gap can be designed, and the performance of the compressor in different working states can be improved.

[0044] In the embodiment of the present application, the air inlet hole 82, the first air passage hole 83, the third air passage hole 71, the second air passage hole 62 and the air outlet hole 72 constitute an air bleeding channel. In use, the high-temperature and high-pressure air flow after work in the casing flow channel flows into the first insertion slot 61 of the half casing 7 from the air inlet hole 82 on the second integrated stator bushing ring 8, passes through the first air passage hole 83, the third air passage hole 71 and the second air passage hole 62 on the end face of the mouth of the second integrated stator bushing ring 8, the half casing 7 and the first integrated stator bushing ring 6, passes through the outer surface of the first integrated stator bushing ring 6, warms the stator blades on the first integrated stator bushing ring 6 with lower temperature, and makes the stator blades and the half casing 7 deform coordinately, and finally flows out from the air outlet hole 72 on the casing wall surface of the first insertion slot 61 of the half casing 7.

[0045] In the embodiment of the present application, the air channel is provided with a plurality of air channels, and the plurality of air channels are uniformly arranged along the circumference of the stator assembly. Further, the air channel can be provided with 15-30 air channels. A plurality of air channels are arranged on each unit of the integrated stator bushing ring and the half casing, which can more uniformly warm the stator blades on the axial flow casing and the half casing.

[0046] In the embodiment of the present application, referring to Figure 6 , the air inlet hole 82 and the air outlet hole 72 have a diameter of 1.5-8 mm, and the first air hole 83, the third air hole 71 and the second air hole 62 have a cross section in the shape of a waist. The air inlet hole 82 is uniformly arranged at 15-30 positions on the circumference of the secondary integrated stator bushing ring 8, and has a diameter of 1.5-8 mm. The air outlet hole 72 is uniformly arranged at 15-30 positions on the circumference of the casing wall surface above the coating position of the primary integrated stator bushing ring 6 on the half casing 7, and has a diameter of 1.5-8 mm. The first air hole 83, the third air hole 71 and the second air hole 62 are located on the end face of the primary integrated stator bushing ring 6, the half casing 7 and the secondary integrated stator bushing ring 8, have a cross section in the shape of a waist, and are uniformly arranged at 15-30 positions on the circumference. The cross section of the first air hole 83, the third air hole 71 and the second air hole 62 is in the shape of a waist, the included angle a° between the two sides of the hole edge is 2°-10°, the hole height X is not greater than 2 / 3 of the height of the matching end face, and the rounding R is 0.5 mm-2 mm. The included angle between the two sides of the hole edge, the hole height X and the rounding R are obtained by calculation, and the air flow rate of the hole with the above range is relatively high, and the stress concentration on the casing is relatively small.

[0047] In the embodiment of the present application, the inner wall of the bushing corresponding to the blade tip of the rotor impeller is provided with a graphite coating. The graphite coating is an abradable coating, which can protect the casing and the blade when the rotor and the stator are slightly scraped. If there is no protection of the coating, the high-speed rotating rotor and the stator may cause safety accidents when scraped.

[0048] In the embodiment of the present application, the bushing 9 is made of stainless steel, and the half casing 7 and the rotor impeller are made of titanium alloy.

[0049] In the embodiment, the half casing and the impeller rotor are made of titanium alloy material with lighter weight, the bushing 9 is arranged at the blade tip of the rotor blade on the half casing, and the bushing 9 is made of stainless steel, so that the problem of titanium fire caused by the blade tip of the rotor easily scraped with the casing due to the deformation of the rotor in high-speed operation can be avoided. In addition, the bushing 9 of the present application is further provided with a graphite coating, which further improves the titanium fire prevention capability.

[0050] In the embodiment of the present application, the reinforcing structure of the outer wall of the integrated stator bushing ring is a reinforcing rib. The present application provides a reinforcing rib structure on the outer wall of the integrated stator bushing ring, thereby improving the rigidity of the half casing and the containment of the half casing. The containment of the half casing on the aero-engine generally refers to the containment of the half casing to the blade. The half casing must have sufficient strength to contain the blade that is broken or falls off at the highest working speed without causing large cracks and verifying the torsional deformation. The prior art increases the wall thickness to improve the rigidity of the half casing, but the increase in the wall thickness increases the weight of the half casing. The integrated stator ring bushing ring can be formed by additive manufacturing, and the reinforcing rib structure can be added to the outer wall to improve the rigidity and containment of the half casing while controlling the weight.

[0051] In the embodiment of the present application, the thickness of the reinforcing rib is 30% to 80% of the height of the insertion groove. Figure 3 and Figure 4 The thickness t2 of the reinforcing rib is 30% to 80% of the height t1 of the T-shaped groove, and the intersection angle θ° of the reinforcing rib is 40° to 90°. The calculation by topology optimization shows that the rigidity is best improved in this range. Since the integrated stator bushing ring is installed in the insertion groove, and the insertion groove needs to pass the airflow, the thickness of the reinforcing rib cannot be too high to avoid affecting the airflow. At the same time, the thickness of the reinforcing rib cannot be too low, otherwise the rigidity of the half casing will be affected. Therefore, the thickness t2 of the reinforcing rib is 30% to 80% of the height t1 of the T-shaped groove, which is the optimal range and can balance the airflow and improve the rigidity of the half casing.

[0052] According to another aspect of the present application, a compressor is also provided, which comprises the stator assembly with bleed holes. The engine comprising the stator assembly with bleed holes can meet the requirements of preventing titanium fire caused by rubbing between the rotor and the stator, containing the fragments caused by the burst of the internal rotor, coordinating the deformation of the front and rear stators, and reducing the weight.

[0053] The existing half casing made of stainless steel and the titanium alloy half casing of the present application are simulated and analyzed by using the contact impact algorithm of the commercial finite element analysis software ANSY / LSDYNA. The results are shown in Table 1.

[0054] Table 1 Weight analysis results of the steel half casing and the titanium alloy half casing

[0055] Item Casing weight Stator ring and bushing weight Total weight Weight reduction percentage Steel casing 12.02 0.88 12.89 / Titanium alloy casing 6.46 1.97 8.44 34.5％

[0056] According to the three-dimensional model simulation, the weight of the stator assembly with bleed holes of the present application is reduced by more than 30% compared with the conventional half casing, the blade containment coefficient is increased by more than 10% compared with the conventional half casing, the non-design point blade tip cold state clearance caused by the deformation of the half casing is reduced by more than 20% compared with the conventional half casing, and the performance of the compressor is effectively improved.

[0057] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A stator assembly with bleed holes, characterized in that, The stator assembly with air bleed holes comprises a half casing (7) and a plurality of integrated stator sleeve rings, the plurality of integrated stator sleeve rings are mounted on the insertion slots of the half casing (7), the integrated stator sleeve ring comprises a sleeve (9) and a stator blade (10), the stator blade (10) is mounted on the sleeve (9), the sleeve (9) is arranged at the blade tip of the rotor blade on the half casing and forms a gap with the rotor blade, and the outer wall of the integrated stator sleeve ring is provided with a reinforcing structure; the integrated stator sleeve ring, the insertion slot and the half casing (7) are provided with air bleed channels in communication with each other, and the air bleed channels are used to guide the airflow from the integrated stator sleeve ring at the hot end to the integrated stator sleeve ring at the cold end through the insertion slot and the half casing (7) so as to realize the coordinated deformation of the stator blade and the half casing (7).

2. The stator assembly with bleed holes of claim 1, wherein, The plurality of integrated stator sleeve rings comprise a first integrated stator sleeve ring (6) near the cold end of the compressor and a second integrated stator sleeve ring (8) near the hot end of the compressor, and the half casing (7) is provided with a first insertion slot (61) and a second insertion slot (81); the first integrated stator sleeve ring (6) is mounted on the first insertion slot (61), and the second integrated stator sleeve ring (8) is mounted on the second insertion slot (81); the second integrated stator sleeve ring (8) is provided with an air inlet hole (82) in communication with the second insertion slot (81) in the radial direction, the first integrated stator sleeve ring (6) is provided with a first air bleed hole (83) on the end face of the stopper near the second integrated stator sleeve ring (8), the second integrated stator sleeve ring (8) is provided with a second air bleed hole (62) on the end face of the stopper near the first integrated stator sleeve ring (6), and the half casing is provided with a third air bleed hole (71) in communication with the first air bleed hole (83) and the second air bleed hole (62); the outer wall of the half casing (7) is provided with an air outlet hole (72) in communication with the first insertion slot (61); and the air inlet hole (82), the first air bleed hole (83), the third air bleed hole (71), the second air bleed hole (62) and the air outlet hole (72) form the air bleed channel.

3. The stator assembly with bleed holes of claim 2, wherein, The air bleed channel is provided with a plurality of air bleed channels, and the plurality of air bleed channels are uniformly arranged along the circumference of the stator assembly.

4. The stator assembly with bleed holes of claim 2, wherein, The diameters of the air inlet hole (82) and the air outlet hole (72) are 1.5-8 mm.

5. The stator assembly of claim 2, wherein, The cross sections of the first air bleed hole (83), the third air bleed hole (71) and the second air bleed hole (62) are in the shape of a waist.

6. The stator assembly of claim 1, wherein, The inner wall of the sleeve (9) corresponding to the blade tip of the rotor wheel is provided with a graphite coating.

7. The stator assembly with bleed holes of claim 6, wherein, The sleeve (9) is made of stainless steel, and the half casing (7) and the rotor wheel are made of titanium alloy.

8. The stator assembly of claim 1, wherein, The reinforcing structure on the outer wall of the integrated stator sleeve ring is a reinforcing rib.

9. The stator assembly with bleed holes of claim 8, wherein, The thickness of the reinforcing rib is 30%-80% of the height of the insertion slot, and the intersection angle of the reinforcing rib is 40°-90°.

10. A compressor characterized by, The stator assembly with air bleed holes comprises a half casing (7) and a plurality of integrated stator sleeve rings, the plurality of integrated stator sleeve rings are mounted on the insertion slots of the half casing (7), the integrated stator sleeve ring comprises a sleeve (9) and a stator blade (10), the stator blade (10) is mounted on the sleeve (9), the sleeve (9) is arranged at the blade tip of the rotor blade on the half casing and forms a gap with the rotor blade, and the outer wall of the integrated stator sleeve ring is provided with a reinforcing structure; the integrated stator sleeve ring, the insertion slot and the half casing (7) are provided with air bleed channels in communication with each other, and the air bleed channels are used to guide the airflow from the integrated stator sleeve ring at the hot end to the integrated stator sleeve ring at the cold end through the insertion slot and the half casing (7) so as to realize the coordinated deformation of the stator blade and the half casing (7).

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