CN113007137B - Diffuser with containment and centrifugal compressor - Google Patents
Diffuser with containment and centrifugal compressor Download PDFInfo
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- CN113007137B CN113007137B CN202110446451.8A CN202110446451A CN113007137B CN 113007137 B CN113007137 B CN 113007137B CN 202110446451 A CN202110446451 A CN 202110446451A CN 113007137 B CN113007137 B CN 113007137B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
- F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
- F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
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Abstract
The invention discloses a diffuser with containment and a centrifugal compressor, which are used for decelerating and diffusing air flow output by a centrifugal impeller and containing rotor blades which fly out after fracture. The diffuser with the inclusion is a radial diffuser made of an aluminum alloy material and an axial diffuser made of a high-temperature alloy material, has the overall design requirements of light weight and good manufacturability, and is simple in structure, good in machining manufacturability, light in weight, strong in inclusion and low in production cost.
Description
Technical Field
The invention relates to the technical field of auxiliary power devices of aero-engines, in particular to a diffuser with containment. In addition, the invention also relates to a centrifugal compressor.
Background
The diffuser is an important functional part of an auxiliary power device of an aeroengine, and the conventional diffuser is generally of an integrated structure, namely, an axial diffuser and a radial diffuser are designed into an integrated structure.
In order to solve the problem of the requirement of strong containment of the rotor and avoid the broken rotor from puncturing the diffuser, two implementation schemes are generally adopted, one scheme is that an integral aluminum alloy diffuser is adopted and matched with a containing ring for use; and the other uses an integral superalloy diffuser. The integral aluminum alloy diffuser is matched with the containing ring for use, so that the weight and the process requirements of the diffuser can be met, but the number of parts of the auxiliary power device is increased, the structure is more complicated, the size of the auxiliary power device is increased, and the production cost is higher; the integral high-temperature alloy diffuser has high hardness and strength, good containment to the rotor, but greater processing difficulty, and cannot meet the overall design requirements of light weight and good manufacturability.
Disclosure of Invention
The diffuser with containment provided by the invention aims to solve the technical problems of complex structure and high processing difficulty of the conventional integral diffuser.
In order to realize the purpose, the technical scheme adopted by the invention is as follows:
the diffuser with the containment is used for decelerating and diffusing air flow output by a centrifugal impeller and is used for containing rotor blades which fly out after fracture, the diffuser with the containment comprises a radial diffuser and an axial diffuser which are separated and sequentially arranged along the air flow direction, the radial diffuser and the axial diffuser are coaxially arranged, the radial diffuser is arranged on the air flow input side of the axial diffuser, the radial diffuser and the axial diffuser are assembled along the axial direction and are fixedly connected through a fastener to form an integral structure, the radial diffuser is made of aluminum alloy materials, and the axial diffuser is made of high-temperature alloy materials.
Furthermore, one side of the axial diffuser, which is close to the radial diffuser, is provided with a mounting ring which extends inwards in the radial direction and an overhanging end which extends outwards in the axial direction, a positioning spigot which is opened and distributed towards the radial diffuser is formed by enclosing between the overhanging end and the mounting ring, and the radial diffuser is inserted into the positioning spigot and is fixedly connected with the mounting ring through a fastener.
Further, a radial gap is reserved between the radial diffuser and the outward extending end of the axial diffuser.
Furthermore, the fastening piece adopts fastening bolts, a plurality of fastening bolts are arranged at intervals along the circumferential direction of the mounting ring, and the fastening bolts axially penetrate through the mounting ring and are in threaded fit connection with the radial diffuser.
Furthermore, a sealing connecting piece is arranged at the position of a surface joint between the radial diffuser and the mounting ring, and the radial diffuser and the mounting ring are connected in a sealing mode through the sealing connecting piece.
Furthermore, sealing connecting piece adopts the sealing rubber ring, and radial diffuser is equipped with the mounting groove that is used for holding sealing rubber ring towards the lateral wall of collar in the fovea superior, and sealing rubber ring locates in the mounting groove.
Furthermore, the extending end of the axial diffuser is positioned between two axial sides of the radial diffuser, and the radial diffuser and the axial diffuser are connected to form an integral structure, so that a circular truncated cone structure distributed along the airflow direction is formed between the extending ends of the radial diffuser and the axial diffuser.
Furthermore, the air inlet side of the radial diffuser is provided with a chamfer, the air inlet side of the overhanging end of the axial diffuser is provided with a chamfer, or an airflow channel on the wall surface of the air inlet side of the radial diffuser is formed by milling.
The invention also provides a centrifugal compressor which comprises the diffuser with the containment function.
The invention has the following beneficial effects:
the diffuser with containment comprises a radial diffuser made of an aluminum alloy material, an axial diffuser made of a high-temperature alloy material and a fastener for connecting the radial diffuser and the axial diffuser into an integral structure. The radial diffuser is made of an aluminum alloy material, the aluminum alloy material is low in density and light in weight, the weight design requirement of the diffuser with the inclusion is favorably met, the aluminum alloy material is low in hardness and strength and is easy to mill, even if a large feed amount is applied to the radial diffuser serving as a thin-wall part in the machining process, the force applied to the part by a cutter is small, the required clamping force is small, the temperature generated in the milling process is low, the radial diffuser serving as the thin-wall part can be effectively prevented from deforming, the machining process is low in difficulty, and the manufacturability is good; the axial diffuser is made of high-temperature alloy materials, the high-temperature alloy materials have higher hardness and strength, are not easy to be punctured by rotor fragments flying out at high speed after the rotor is broken, do not need to additionally adapt and design containing ring parts, have simple structure and have good containment on the basis of not increasing the volume of the auxiliary power device; and the radial diffuser and the axial diffuser adopt a split design, so that the radial diffuser and the axial diffuser can be conveniently and independently processed and maintained. The diffuser with the inclusion is a radial diffuser made of an aluminum alloy material and an axial diffuser made of a high-temperature alloy material, has the overall design requirements of light weight and good manufacturability, and is simple in structure, good in machining manufacturability, light in weight, strong in inclusion and low in production cost.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
FIG. 1 is a front view of a preferred embodiment diffuser with containment of the present invention;
FIG. 2 isbase:Sub>A sectional view taken along line A-A of FIG. 1;
FIG. 3 is an enlarged view at B in FIG. 2;
fig. 4 is a schematic diagram of the dimension chain design of the truncated cone structure of the preferred embodiment of the present invention.
Illustration of the drawings:
10. a diffuser having containment; 11. a radial diffuser; 12. an axial diffuser; 121. a mounting ring; 122. an overhanging end; 123. positioning a spigot; 13. a fastener; 14. and sealing the connecting piece.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be practiced in many different ways, which are defined and covered by the following.
FIG. 1 is a front view of a preferred embodiment diffuser with containment of the present invention; FIG. 2 isbase:Sub>A sectional view taken along line A-A of FIG. 1; FIG. 3 is an enlarged view at B in FIG. 2; fig. 4 is a schematic diagram of the dimension chain design of the truncated cone structure of the preferred embodiment of the present invention.
As shown in fig. 1 and 2, the diffuser 10 with containment of this embodiment is used for decelerating and diffusing an air flow output by a centrifugal impeller and for containing a rotor blade which flies out after a fracture, the diffuser 10 with containment includes a radial diffuser 11 and an axial diffuser 12 which are separated and sequentially arranged along an air flow direction, the radial diffuser 11 and the axial diffuser 12 are coaxially arranged, the radial diffuser 11 is arranged on an air flow input side of the axial diffuser 12, the radial diffuser 11 and the axial diffuser 12 are assembled in an axial direction and fixedly connected through a fastener 13 to form an integral structure, the radial diffuser 11 is made of an aluminum alloy material, and the axial diffuser 12 is made of a high-temperature alloy material.
The diffuser 10 with containment of the present invention includes a radial diffuser 11 made of an aluminum alloy material, an axial diffuser 12 made of a high temperature alloy material, and a fastening member 13 connecting the radial diffuser 11 and the axial diffuser 12 into an integral structure. The radial diffuser 11 is made of an aluminum alloy material, the aluminum alloy material is low in density and light in weight, the weight design requirement of the diffuser 10 with the inclusion is favorably met, the aluminum alloy material is low in hardness and strength and is easy to mill, even if a large feed amount is applied to the radial diffuser 11 serving as a thin-wall part in the machining process, the force applied to the part by a cutter is small, the required clamping force is small, the temperature generated in the milling process is low, the radial diffuser 11 serving as the thin-wall part can be effectively prevented from deforming, the machining process is low in difficulty, and the manufacturability is good; the axial diffuser 12 is made of high-temperature alloy material, the high-temperature alloy material has higher hardness and strength, is not easy to be punctured by rotor fragments flying out at high speed after the rotor is broken, does not need to additionally adapt and design containing ring parts, has simple structure and has good containment performance on the basis of not increasing the volume of the auxiliary power device; the radial diffuser 11 and the axial diffuser 12 adopt a split design, so that the radial diffuser 11 and the axial diffuser 12 can be conveniently and independently processed and maintained. The diffuser 10 with the inclusion disclosed by the invention has the overall design requirements of light weight and good manufacturability, and is simple in structure, good in processing manufacturability, light in weight, strong in inclusion and low in production cost.
Because the high-temperature alloy is more expensive than the aluminum alloy and has heavier weight, the diffuser adopting the split design can use two materials, firstly, the diffuser aims to reduce the weight, secondly, the diffuser can not fully use the high-temperature alloy, thirdly, the diffuser can use the high-temperature alloy with higher strength in the required place, and the diffuser has strong containment property.
It is understood that the axial diffuser 12 is disposed on the gas flow output side of the radial diffuser 11, the radial diffuser 11 is used for decelerating and diffusing the gas flow and converting the gas flow from the axial direction to the radial direction, and the axial diffuser 12 is used for further decelerating and diffusing the gas flow and converting the gas flow from the radial direction to the axial direction. The radial diffuser 11 and the axial diffuser 12 are assembled in the axial direction and are fixedly connected through a fastener 13 to form an integral structure, the radial diffuser 11 and the axial diffuser 12 are connected through a buckle to form an integral structure, and the radial diffuser 11 and the axial diffuser 12 are fixedly connected through a hoop, a fastening bolt and the like to form an integral structure. The aluminum alloy material in the invention adopts at least one of aluminum alloy 2214, aluminum alloy 2A12 and aluminum alloy 2A70, and the high-temperature alloy material adopts at least one of GH625, GH4169, GH2132 and high-quality GH 2132.
Optionally, one side of the axial diffuser 12 facing the radial diffuser 11 is provided with a positioning spigot 123, the radial diffuser 11 is inserted into the positioning spigot 123 on the axial diffuser 12, a radial gap is left between the radial diffuser 11 and the side wall surface of the positioning spigot 123, and the radial diffuser 11 and the axial diffuser 12 are fixedly connected through a fastener 13.
Further, referring to fig. 3 and 4, a mounting ring 121 formed by extending inward in the radial direction and an overhanging end 122 formed by extending outward in the axial direction are disposed on one side of the axial diffuser 12 close to the radial diffuser 11, a positioning spigot 123 opened toward the radial diffuser 11 is formed by enclosing between the overhanging end 122 of the axial diffuser 12 and the mounting ring 121, and the radial diffuser 11 is inserted into the positioning spigot 123 and fixedly connected to the mounting ring 121 through a fastener 13. It is understood that in the present embodiment, the radial diffuser 11 and the axial diffuser 12 are both annular structures. The radial diffuser 12 and the radial diffuser 11 are radially positioned by adopting a spigot structure, the radial diffuser 11 and the axial diffuser 12 are axially fixedly connected through the fastening piece 13, and the axial diffuser 12 and the radial diffuser 11 are connected into a whole.
Further, because the radial diffuser 11 and the axial diffuser 12 are made of different materials, when the diffuser 10 with the inclusion is in a working state, the thermal expansion amount of the radial diffuser 11 and the thermal expansion amount of the axial diffuser 12 are different at high temperature, the expansion coefficient of the aluminum alloy material of the radial diffuser 11 is greater than that of the high-temperature alloy of the axial diffuser 12, the radial diffuser 11 generates a larger thermal expansion amount, in order to prevent the radial diffuser 11 from expanding and extruding to damage the axial diffuser 12 due to the difference of the thermal expansion amounts at high temperature, and a radial gap is left between the radial diffuser 11 and the outward extending end 122 of the axial diffuser 12.
Preferably, in order to avoid the large interference fit between the clearance fit between the radial diffuser 11 and the overhanging end 122 of the axial diffuser 12, which may cause deformation or even damage of parts, a sufficient clearance margin must be reserved when designing the spigot radial clearance fit, and the clearance of the radial clearance is at least the difference between the thermal expansion deformation of the aluminum alloy radial diffuser and the high temperature alloy axial diffuser in the range between the maximum working temperature and the normal temperature difference.
Further, the radial diffuser 11 is provided with a tip flow passage for passing the airflow.
Further, in order to fixedly connect the radial diffuser 11 and the axial diffuser 12 in the axial direction, the fastening member 13 is a fastening bolt, a plurality of fastening bolts are arranged at intervals in the circumferential direction of the mounting ring 121, and the fastening bolt penetrates through the mounting ring 121 in the axial direction and is connected with the radial diffuser 11 in a threaded fit manner. It is understood that the number of the fastening bolts is five, six, eight or other numbers, and a plurality of the fastening bolts are arranged at regular intervals in the circumferential direction of the mounting ring 121. Alternatively, the fastening bolt passes through the mounting ring 121 and the radial diffuser 11 in sequence along the axial direction to be in threaded fit connection with a nut, so that the radial diffuser 11 and the axial diffuser 12 are fixedly connected along the axial direction. More preferably, a spacer is provided between the fastening bolt and the mounting ring 121.
In the invention, the spigot positioning is matched with the bolt connection, the axial diffuser 12 and the radial diffuser 11 can be connected into a whole and assembled in an auxiliary power device for working, and other parts such as an enclosing ring and the like do not need to be additionally designed, so that the structure is simple and the assembly performance is good.
Further, referring to fig. 3, in order to prevent the flow passage gas flow from leaking through the spigot gap and affecting the performance, a sealing connector 14 is disposed at a position where the radial diffuser 11 and the mounting ring 121 are in face-to-face engagement, and the radial diffuser 11 and the mounting ring 121 are in sealing connection through the sealing connector 14.
More preferably, the sealing connection member 14 is a sealing rubber ring, and a mounting groove for accommodating the sealing rubber ring is concavely arranged on a side wall of the radial diffuser 11 facing the mounting ring 121, and the sealing rubber ring is arranged in the mounting groove. The axial diffuser 12 and the radial diffuser 11 are connected into a whole through the fastening bolts, the mounting groove is used for positioning the sealing rubber ring, so that the sealing rubber ring is arranged in the positioning spigot 123, and the sealing rubber ring is arranged between the mounting ring 121 and the radial diffuser 11, so that the sealing performance of the diffuser 10 with containment is ensured, and the influence on the performance caused by leakage of airflow of a flow passage through a spigot gap is prevented.
Further, referring to fig. 4, in order to avoid an air flow reverse step at a connection between the radial diffuser 11 and the axial diffuser 12 at the spigot, the overhanging end 122 of the axial diffuser 12 is located between the radial diffuser 11 in the axial direction, and after the radial diffuser 11 and the axial diffuser 12 are connected to form an integral structure, a circular truncated cone structure arranged along the air flow direction is formed between the radial diffuser 11 and the overhanging end 122 of the axial diffuser 12. It can be understood that, after the radial diffuser 11 and the axial diffuser 12 are connected to form an integral structure, the sidewall of the airflow input side of the radial diffuser 11 is disposed on the side of the overhanging end 122 of the axial diffuser 12 away from the mounting ring 121, that is, the sidewall of the airflow input side of the radial diffuser 11 protrudes from the sidewall of the overhanging end, so that the integral structure formed by connecting the radial diffuser 11 and the axial diffuser 12 is designed in a step-by-step manner, and further, the occurrence of airflow step reversal between the axial diffuser 11 and the radial diffuser 12 is avoided, which affects the aerodynamic performance.
Preferably, in order to avoid the phenomenon that the pneumatic performance of the auxiliary power device is affected by the reverse step of the airflow at the joint of the radial diffuser 11 and the axial diffuser 12 at the spigot, during the structural design, the limit of the dimensional tolerance is ensured through the reasonable design of the dimensional chainIn this state, the air flow is still in a step-following state, that is, the minimum value t of the step-following height t in the attached figure 4 should be ensured min ＝L1 min -L2 max -L3 max -L4 max ≧ 0, wherein the subscript "min" indicates that the dimension is the minimum within the tolerance range, the subscript " max "the size is the maximum value within the tolerance range, and the performance of the auxiliary power device is prevented from being influenced by the over-size of the smooth step, namely, the maximum value t of the height of the smooth step is ensured max ＝L1 max -L2 min -L3 min -L4 min Should be less than a certain value determined by pneumatic calculation evaluation. Wherein L1 represents the radial diffuser base body axial thickness, L2 represents the radial diffuser blade axial height, L3 represents the radial diffuser airflow exit chamfer angle axial distance, L4 represents the axial diffuser tang axial depth.
Further, in order to facilitate the flow of the gas, the inlet side of the radial diffuser 11 is provided with a chamfer, and the inlet side of the overhang end 122 of the axial diffuser 12 is provided with a chamfer. In this embodiment, the chamfer may be a rounded or chamfered angle.
Further, the flow passage on the wall surface on the intake side of the radial diffuser 11 is formed by milling. The existing high-temperature alloy diffuser is high in hardness and strength, poor in processing manufacturability, large in cutting force and clamping force on parts and easy to generate high temperature in a milling process in the processing process, so that the diffuser serving as a thin-wall part is easy to deform, particularly when a flow passage between 11 blades of a radial diffuser is processed, the rigidity of the part is poor when the inlet of the flow passage is a throat part, the outlet of the flow passage is good, the rigidity of the part is good, therefore, when the throat part is processed, the part is easy to generate a cutter relieving phenomenon, the height of the throat is easy to be out of tolerance, and the pneumatic performance of an auxiliary power device is influenced. The split radial diffuser 11 is adopted, so that the problem of out-of-tolerance caused by cutter back-off due to poor rigidity of parts during throat processing is solved, and the process difficulty is low.
The invention has the following beneficial effects: the diffuser 10 with the containment function designed by the invention is of a split structure, namely, a radial diffuser 11 and an axial diffuser 12 are divided into two parts to be designed and processed, then the radial diffuser 11 and the axial diffuser 12 which are independent from each other are assembled to form an integral structure, the spigot positioning and the bolt matching connection are adopted, the axial diffuser 12 and the radial diffuser 11 are connected into a whole, and the spigot positioning and the pressing are adopted to tightly seal a rubber ring, so that the sealing performance of the diffuser 10 with the containment function is ensured, and the influence on the performance caused by the leakage of airflow of a flow passage through a spigot gap is prevented. In the invention, in order to ensure the strong containment of the diffuser on the rotor, the axial diffuser 12 is made of high-temperature alloy with high hardness and strength, and in order to meet the design requirement of light weight, the radial diffuser 11 is made of aluminum alloy with low density and good processing manufacturability. Although the axial diffuser 12 is still processed by high-temperature alloy, compared with the integral diffuser, the axial diffuser 12 with the split design has a simpler structure, obviously reduces the process difficulty, and avoids the problem that the pneumatic performance is affected by the cutter back-off phenomenon caused by poor part rigidity during throat processing. According to the invention, the axial diffuser 12 and the radial diffuser 11 can be connected into a whole through the spigot positioning matched with the bolt connection, and are assembled in the auxiliary power device to work without additionally designing other parts such as an containing ring and the like, so that the centrifugal compressor is simple in structure, good in assembly, strong in inclusion, good in processing manufacturability, light in weight, mainly suitable for the centrifugal compressor of the auxiliary power device of the small and medium-sized aeroengine, and the design requirements of strong inclusion, simple structure, small size, light in weight, good in processing manufacturability, low in production cost and the like cannot be considered in the existing integral diffuser design.
The invention also provides a centrifugal compressor which comprises the diffuser 10 with the containment function. The centrifugal compressor comprises the diffuser 10 with the inclusion property, and has the advantages of strong inclusion property, simple structure, good processing manufacturability and light weight.
The present invention has been described in terms of the preferred embodiment, and it is not intended to be limited to the embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A diffuser with containment is used for decelerating and diffusing the airflow output by a centrifugal impeller and for containing rotor blades flying out after fracture,
the diffuser with containment comprises a radial diffuser (11) and an axial diffuser (12) which are separated and sequentially arranged along the airflow direction, the radial diffuser (11) and the axial diffuser (12) are independently designed, processed and maintained,
the radial diffuser (11) and the axial diffuser (12) are coaxially arranged, the radial diffuser (11) is arranged on the airflow input side of the axial diffuser (12), the radial diffuser (11) and the axial diffuser (12) are assembled in the axial direction and fixedly connected through a fastener (13) to form an integral structure,
the radial diffuser (11) is made of an aluminum alloy material, and the axial diffuser (12) is made of a high-temperature alloy material.
2. The inclusive diffuser of claim 1,
one side of the axial diffuser (12) close to the radial diffuser (11) is provided with a mounting ring (121) which extends inwards in the radial direction and an overhanging end (122) which extends outwards in the axial direction, a positioning spigot (123) which is opened and distributed towards the radial diffuser (11) is formed between the overhanging end (122) and the mounting ring (121) in a surrounding manner,
the radial diffuser (11) is inserted into the positioning spigot (123) and is fixedly connected with the mounting ring (121) through the fastener (13).
3. The inclusive diffuser of claim 2,
a radial gap is reserved between the radial diffuser (11) and the outward extending end (122) of the axial diffuser (12).
4. The inclusive diffuser of claim 2,
the fastening pieces (13) adopt fastening bolts, a plurality of fastening bolts are arranged at intervals along the circumferential direction of the mounting ring (121),
the fastening bolt axially penetrates through the mounting ring (121) and is in threaded fit connection with the radial diffuser (11).
5. The inclusive diffuser of claim 2,
and a sealing connecting piece (14) is arranged at a surface fitting position between the radial diffuser (11) and the mounting ring (121), and the radial diffuser (11) is in sealing connection with the mounting ring (121) through the sealing connecting piece (14).
6. The inclusive diffuser of claim 5,
sealing connecting piece (14) adopt the sealing rubber ring, radial diffuser (11) orientation the concave mounting groove that is used for the holding on the lateral wall of collar (121) sealing rubber ring, sealing rubber ring locates in the mounting groove.
7. The inclusive diffuser of claim 2,
the radial diffuser is characterized in that an extending end (122) of the axial diffuser (12) is located between two axial sides of the radial diffuser (11), the radial diffuser (11) and the axial diffuser (12) are connected to form an integral structure, and a circular truncated cone structure which is distributed along the airflow direction is formed between the extending end (122) of the radial diffuser (11) and the extending end (12).
8. The inclusive diffuser of claim 2,
the air inlet side of the radial diffuser (11) is provided with a chamfer angle, the air inlet side of the overhanging end (122) of the axial diffuser (12) is provided with a chamfer angle, or,
and an airflow channel on the wall surface of the air inlet side of the radial diffuser (11) is formed by milling.
9. A centrifugal compressor is characterized in that,
comprising an inclusive diffuser according to any of the preceding claims 1 to 8.
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| CN110582649A (en) * | 2017-04-07 | 2019-12-17 | 赛峰飞机发动机公司 | Reinforced axial diffuser |
| CN109630468A (en) * | 2018-12-07 | 2019-04-16 | 中国科学院工程热物理研究所 | Diffuser positioning device |
| CN211901078U (en) * | 2019-12-03 | 2020-11-10 | 珠海格力电器股份有限公司 | Axial flow guide diffuser and high-speed motor with same |
| CN112377268A (en) * | 2020-11-13 | 2021-02-19 | 中国航发湖南动力机械研究所 | Integrated diffuser for additive manufacturing |
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| CN113007137A (en) | 2021-06-22 |
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