CN115111200A - Diffuser, centrifugal compressor and air compression method - Google Patents

Diffuser, centrifugal compressor and air compression method Download PDF

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Publication number
CN115111200A
CN115111200A CN202210933063.7A CN202210933063A CN115111200A CN 115111200 A CN115111200 A CN 115111200A CN 202210933063 A CN202210933063 A CN 202210933063A CN 115111200 A CN115111200 A CN 115111200A
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China
Prior art keywords
diffuser
radial
blade
main
splitter
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CN202210933063.7A
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Chinese (zh)
Inventor
何家祥
董琨
尹法辉
赵学松
周阔海
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Qinghang Aerospace Beijing Technology Co ltd
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Qinghang Aerospace Beijing Technology Co ltd
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Priority to CN202210933063.7A priority Critical patent/CN115111200A/en
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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
    • F04D29/444—Bladed diffusers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/10—Centrifugal pumps for compressing or evacuating

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention discloses a diffuser, a centrifugal compressor and a gas compression method, wherein the diffuser comprises a diffuser main body, diffuser main blades and diffuser splitter blades, wherein the number of the diffuser main blades and the number of the diffuser splitter blades are multiple, and the diffuser main blades and the diffuser splitter blades are arranged on the diffuser main body at intervals in a staggered manner along the axis of the diffuser main body; the diffuser main blade extends to the longitudinal end face from the radial end face of the diffuser main body, radial and axial integrated diffusion is achieved through the diffuser main blade, and the radial size of the diffuser is reduced. The diffuser splitter blade is arranged on the radial end face of the diffuser body and divides the radial airflow channel into the first radial channel and the second radial channel, so that when airflow enters the diffuser, the airflow firstly passes through the first radial channel and the second radial channel on the radial end face of the diffuser body and then gradually merges when turning into the axial airflow channel, and the pressure loss at the turning position is reduced, namely the airflow loss in the diffuser is reduced.

Description

Diffuser, centrifugal compressor and air compression method
Technical Field
The invention relates to the technical field of air compression equipment, in particular to a diffuser, a centrifugal compressor and an air compression method.
Background
The centrifugal compressor has the advantages of high single-stage pressure ratio, wide working range, simple structure, high reliability and the like, and is widely applied to small gas turbines and small and medium-sized aeroengines. Along with the improvement of the pressure ratio of the centrifugal compressor, the non-uniform degree of the airflow at the outlet of the centrifugal impeller is improved, the airflow speed is also improved, the Mach number at the inlet of the radial diffuser reaches high subsonic or even ultrasonic, shock waves are formed at the inlet or the passage of the diffuser, and the performance of the centrifugal compressor is influenced. Meanwhile, in order to reduce the windward area of the engine and improve the thrust-weight ratio of the engine, the radial size of the engine needs to be reduced to the maximum extent, along with the reduction of the outer diameter of the engine, the length of a radial diffuser of the centrifugal compressor is reduced, the diffusion load of the diffuser is increased rapidly, so that the flow channel separation in a blade passage is easy to occur, the loss in the diffuser is increased, and the design of the diffuser is more difficult.
At present, a centrifugal compressor generally adopts a combination of a radial diffuser and an axial diffuser, and airflow enters the radial diffuser from an impeller outlet and then enters the axial diffuser after turning for 90 degrees. The turning section is lack of guidance, and the outlet speed of the radial diffuser is high, so that the loss of the turning section is large, and the performance of the compressor is further influenced.
Disclosure of Invention
In view of the above, a first object of the present invention is to provide a diffuser, which aims to reduce the flow loss of the air flow in the diffuser and reduce the radial size of the diffuser.
A second object of the present invention is to provide a centrifugal compressor.
A second object of the present invention is to provide a method of compressing gas.
In order to achieve the first object, the present invention provides the following solutions:
a diffuser, comprising:
the centrifugal impeller diffuser comprises a diffuser main body, wherein the axis of the diffuser main body is provided with a mounting hole for mounting a centrifugal impeller;
the diffuser main blades and the diffuser splitter blades are arranged on the diffuser main body in a staggered and spaced mode along the axis of the diffuser main body;
the diffuser main blades extend from the radial end surface of the diffuser main body to the longitudinal end surface, and a radial airflow channel and an axial airflow channel which are communicated are formed between the adjacent diffuser main blades in an enclosing manner;
the diffuser splitter blade is arranged on the radial end face of the diffuser body and divides the radial airflow channel into a first radial channel and a second radial channel.
In a particular embodiment, the diffuser main vane includes a first wedge portion and a first arcuate portion having a first end integrally connected to the first wedge portion;
the end part of the wedge angle of the first wedge-shaped part is flush with the hole wall of the mounting hole, and two side wall surfaces of the first wedge-shaped part are respectively tangent to two side wall surfaces of the first arc-shaped part;
the second end of the first arc-shaped part extends out of the axial end face of the diffuser body by a preset length, and the part, extending out of the axial end face of the diffuser body, of the first arc-shaped part adjacent to the first arc-shaped part is surrounded by an axial airflow channel.
In another specific embodiment, the diffuser splitter vane includes a second wedge portion and a second arcuate portion having a first end integrally connected to the second wedge portion;
the tip of the wedge angle of second wedge portion with the pore wall parallel and level of mounting hole, just the both sides wall face of second wedge portion respectively with the both sides wall face of second wedge portion is tangent to be set up, just the second end of second arc portion with the axial end face parallel and level of diffuser main part.
In another specific embodiment, said first radial passage or said second radial passageThe cross section A of any position of the radial channel and the throat section A of the first radial channel or the second radial channel t The ratio of (A) satisfies the following formula:
Figure BDA0003782500840000031
wherein L represents the total arc length of the diffuser splitter blade, L represents the arc length of the diffuser splitter blade from the throat of the first radial channel or the second radial channel to the position of the section A, the throat position of the first radial channel or the second radial channel is 0, and C is 0 Representing the area change coefficient, and taking the value of 1-5;
and/or
A wedge angle of the first wedge portion is greater than or equal to 5 degrees and less than or equal to 10 degrees;
the second wedge portion has a wedge angle greater than or equal to 5 ° and less than or equal to 10 °.
In another specific embodiment, one side wall surface of a main blade of the diffuser is a main blade suction surface, and the other side wall surface is a main blade pressure surface;
one side wall surface of the splitter blade of the diffuser is a suction surface of the splitter blade, and the other side wall surface of the splitter blade is a pressure surface of the splitter blade;
the diffuser splitter blade is characterized in that the splitter blade suction surface of the diffuser splitter blade and the main blade pressure surface of the main blade of the diffuser adjacent to one side are arranged face to face, and the splitter blade pressure surface of the diffuser splitter blade and the main blade suction surface of the main blade of the diffuser adjacent to the other side are arranged face to face.
In another specific embodiment, on each of the diffuser main blades, a connection surface connecting a suction surface of the main blade and a pressure surface of the main blade is an arc surface, and the connection surfaces on all the diffuser main blades are located on the same cylindrical surface.
In another specific embodiment, the angle subtended by the primary vane suction surface and the terminal end surface of the first radial passage is greater than or equal to 80 °;
the first radial channel and the second radial channel are respectively in arc transition to the axial airflow channel.
In another specific embodiment, the axial flow passage has a progressively larger cross-section in a direction away from the axis of the diffuser body.
The various embodiments according to the invention can be combined as desired, and the embodiments obtained after these combinations are also within the scope of the invention and are part of the specific embodiments of the invention.
According to the diffuser provided by the invention, the main blades of the diffuser extend from the radial end surface of the diffuser main body to the longitudinal end surface, and the adjacent main blades of the diffuser are surrounded to form the communicated radial airflow channel and axial airflow channel, so that the radial and axial integrated diffusion is realized through the main blades of the diffuser, the problem of large radial size caused by sectional diffusion by independently arranging the radial diffuser and the axial diffuser is avoided, and the radial size of the diffuser is reduced.
In addition, because the diffuser splitter blades and the diffuser main blades are arranged at intervals in a staggered mode, and the diffuser splitter blades are only arranged on the radial end face of the diffuser main body to divide the radial airflow channel into the first radial channel and the second radial channel, when airflow enters the diffuser, the airflow passes through the first radial channel and the second radial channel on the radial end face of the diffuser main body and then gradually merges when turning into the axial airflow channel, and the pressure loss at the turning position is reduced, namely the airflow loss in the diffuser is reduced.
In order to achieve the second object, the present invention provides the following solutions:
a centrifugal compressor comprising a centrifugal impeller and a diffuser as claimed in any one of the preceding claims;
the centrifugal impeller is rotatably installed in the mounting hole of the diffuser, and the centrifugal impeller comprises a first blade and a second blade, and the first blade and the second blade are different in length in the axial direction of the centrifugal impeller, and the number of the first blade and the second blade is multiple and is arranged along the axis of the centrifugal impeller at intervals in a staggered mode.
Because the centrifugal compressor provided by the invention comprises the diffuser in any one of the above items, the diffuser has the beneficial effects that the centrifugal compressor disclosed by the invention comprises.
In order to achieve the third object, the present invention provides the following solutions:
a method of compressing gas, comprising:
providing a centrifugal compressor as described above;
starting the centrifugal impeller to enable the centrifugal impeller to rotate to do work, and sucking air into the centrifugal impeller along the axial direction of the centrifugal impeller and compressing the air;
air enters a first radial passage and a second radial passage of the diffuser along the radial direction of the centrifugal impeller, enters an axial airflow passage of the diffuser after turning for 90 degrees and is discharged out of the diffuser.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without novelty work.
FIG. 1 is a schematic three-dimensional structure of a diffuser according to the present invention;
FIG. 2 is a schematic front view of a diffuser according to the present invention;
FIG. 3 is a schematic rear view of a diffuser according to the present invention;
FIG. 4 is a schematic diagram of a front view structure of a centrifugal compressor provided by the present invention;
fig. 5 is a schematic view of a partial cross-sectional structure of a centrifugal compressor according to the present invention.
Wherein, in fig. 1-5:
the centrifugal impeller comprises a diffuser 100, a diffuser body 101, a diffuser main blade 102, a diffuser splitter blade 103, a mounting hole 101a, a radial airflow passage 104, an axial airflow passage 105, a first radial passage 104a, a second radial passage 104b, a first wedge-shaped portion 102a, a first arc-shaped portion 102b, a second wedge-shaped portion 103a, a second arc-shaped portion 103b, a main blade suction surface 102c, a main blade pressure surface 102d, a splitter blade suction surface 103c, a splitter blade pressure surface 103d, a connecting surface 102e, a centrifugal compressor 1000, a centrifugal impeller 200, a first blade 201, a second blade 202 and a casing surface 300.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to fig. 1 to 5 in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the position or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Referring to fig. 1-5, a first aspect of the present invention provides a diffuser 100 to reduce flow losses and the radial size of the diffuser 100.
As shown in fig. 1 to 3, the diffuser 100 includes a diffuser body 101, a diffuser main blade 102 and a diffuser splitter blade 103, specifically, the diffuser body 101 includes a radial disc and an axial hub connected integrally, and an outer wall of the radial disc is arc-shaped and transited to one end of the axial hub to reduce the pressure loss of the airflow flowing through the diffuser 100.
The diffuser body 101 has an axis provided with a mounting hole 101a for mounting the centrifugal impeller 200, and the centrifugal impeller 200 and the diffuser body 101 are coaxially disposed.
In order to avoid interference between the blades of the centrifugal impeller 200 and the diffuser main body 101 when the centrifugal impeller 200 rotates and facilitate the centrifugal impeller 200 to convey gas into the diffuser 100, the invention discloses that the end surface of the diffuser main body 101 facing the centrifugal impeller 200 is provided with a containing groove, so that the edges of the blades of the centrifugal impeller 200 extend into the containing groove, and the end surface of the edges of the blades of the centrifugal impeller 200 is flush with the end surface of the diffuser main body 101 facing the centrifugal impeller 200.
The number of the diffuser main blades 102 and the diffuser splitter blades 103 is multiple, and the plurality of diffuser main blades 102 and the plurality of diffuser splitter blades 103 are arranged on the diffuser main body 101 at intervals in a staggered mode along the axis of the diffuser main body 101. Specifically, a plurality of diffuser main blades 102 and diffuser splitter blades 103 are spaced alternately and annularly uniformly distributed on the diffuser main body 101.
The diffuser main blades 102 extend from the radial end surface to the longitudinal end surface of the diffuser body 101, and a radial airflow passage 104 and an axial airflow passage 105 which are communicated with each other are arranged between the adjacent diffuser main blades 102 in a surrounding mode. That is, the diffuser main vane 102 realizes the radial and axial integrated diffusion, thereby avoiding the problem of large radial size caused by separately arranging the radial diffuser 100 and the axial diffuser 100 to perform segmented diffusion, and reducing the radial size of the diffuser 100.
The diffuser splitter blade 103 is disposed on a radial end surface of the diffuser main body 101, and divides the radial airflow passage 104 into a first radial passage 104a and a second radial passage 104b, and the first radial passage 104a and the second radial passage 104b are formed by enclosing the diffuser splitter blade 103 and 2 adjacent diffuser main blades 102. The radial airflow passage 104 is divided into the first radial passage 104a and the second radial passage 104b, so that when entering the diffuser 100, airflow passes through the first radial passage 104a and the second radial passage 104b on the radial end surface of the diffuser body 101, and then gradually merges when turning into the axial airflow passage 105, thereby reducing the pressure loss at the turning position, namely the airflow loss in the diffuser 100.
The radial end surface of the diffuser body 101 refers to a surface of the diffuser body 101 along the radial direction and facing the centrifugal impeller 200, that is, an end surface of a radial disc away from the axial hub; the axial end surface of the diffuser body 101 refers to a surface of the diffuser body 101 along the axial direction, i.e., an annular outer wall surface of the axial hub.
In some embodiments, the diffuser main blade 102 includes a first wedge portion 102a and a first arc portion 102b, and a first end of the first arc portion 102b is integrally connected to the first wedge portion 102a for ease of manufacturing.
The end of the wedge angle α of the first wedge-shaped portion 102a is flush with the wall of the mounting hole 101a, and the end of the diffuser main blade 102 close to the centrifugal impeller 200 is configured as a wedge-shaped structure, so that a guiding effect is provided for the gas flow entering the diffuser 100, the resistance to the gas flow is reduced, and the loss of the gas flow is further reduced.
Two side wall surfaces of the first wedge-shaped part 102a are respectively tangent to two side wall surfaces of the first arc-shaped part 102b, so that on one hand, the diffuser main blade 102 is convenient to process and manufacture; on the other hand, the first wedge-shaped portion 102a and the first arc-shaped portion 102b are in smooth transition connection, so that the resistance of the airflow is further reduced, and the airflow loss is further reduced.
The second end of the first arc-shaped portion 102b extends out of the axial end surface of the diffuser body 101 by a predetermined length, and the portion of the adjacent first arc-shaped portion 102b extending out of the axial end surface of the diffuser body 101 is surrounded by an axial airflow passage 105. That is, the curvature of the diffuser main blade 102 surrounding the axial flow passage 105 is the same as the curvature of the diffuser main blade 102 surrounding the radial flow passage 104, which facilitates the manufacturing of the diffuser main blade 102.
Specifically, as shown in fig. 2, the front projection line of the pressure surface 102d of the main blade is AF, and is composed of a straight line segment and a tangential arc segment; the front view projection line of the main blade suction surface 102c is AG, and is composed of a straight line segment and a tangential arc segment.
Further, the present invention discloses that the wedge angle α of the first wedge portion 102a is greater than or equal to 5 ° and less than or equal to 10 °. The wedge angle α of the first wedge portion 102a is not limited to the above range, and may be set to other angle values as needed.
In some embodiments, the diffuser splitter blade 103 includes a second wedge 103a and a second arc 103b, and the first end of the second arc 103b is integrally connected to the second wedge 103a for easy manufacturing.
The end of the wedge angle β of the second wedge-shaped portion 103a is flush with the wall of the mounting hole 101a, and the end of the diffuser splitter blade 103 close to the centrifugal impeller 200 is set to be wedge-shaped, so that a guiding effect is provided for the gas flow entering the diffuser 100, the resistance to the gas flow is reduced, and the loss of the gas flow is further reduced.
The two side wall surfaces of the second wedge-shaped portion 103a are respectively tangent to the two side wall surfaces of the second wedge-shaped portion 103a, so that the diffuser splitter blade 103 is convenient to process and manufacture on one hand, and on the other hand, the second wedge-shaped portion 103a and the second arc-shaped portion 103b are in smooth transition connection, so that the resistance of air flow is further reduced, and the air flow loss is further reduced.
The second end of the second arc-shaped portion 103b is flush with the axial end face of the diffuser body 101, so that the gas flows can merge into the axial gas flow passage 105 at a turn after passing through the first radial passage 104a and the second radial passage 104 b.
Specifically, as shown in fig. 2, the front view projection line of the splitter blade suction surface 103c is BI, and is composed of a straight line segment and a tangent arc segment; the front view projection line of the splitter blade suction surface 103c is BJ and is composed of a straight line segment and a tangential arc segment. The throat section BD of the first radial passage 104a and the throat section CE of the second radial passage 104b are given by calculation based on the outlet parameters of the centrifugal impeller 200.
Further, the present invention discloses that the cross section A at any position of the first radial passage 104a or the second radial passage 104b and the throat section A of the first radial passage 104a or the second radial passage 104b t Ratio of (A to (B)The value satisfies the following formula:
Figure BDA0003782500840000091
wherein L represents the total arc length of the diffuser splitter blade 103, L represents the arc length of the diffuser splitter blade 103 from the throat of the first radial passage 104a or the second radial passage 104b to the position of the section a, the throat position of the first radial passage 104a or the second radial passage 104b is 0, and C is 0 And (3) representing the area change coefficient, and taking the value of 1-5.
As shown in fig. 2, the throat section of the first radial passage 104a is the section at BD, the throat section of the second radial passage 104b is the section at CE, the total arc length of the diffuser splitter blade 103 when calculating the cross section at any position of the first radial passage 104a is the length of BI, and the total arc length of the diffuser splitter blade 103 when calculating the cross section at any position of the second radial passage 104b is the length of BJ.
Further, the present invention discloses that the wedge angle β of the second wedge portion 103a is greater than or equal to 5 ° and less than or equal to 10 °. The wedge angle β of the second wedge portion 103a is not limited to the above range, and may be set to another angle value as needed.
In some embodiments, one sidewall surface of the diffuser main blade 102 is a main blade suction surface 102c and the other sidewall surface is a main blade pressure surface 102 d; one side wall surface of the diffuser splitter blade 103 is a splitter blade suction surface 103c, and the other side wall surface is a splitter blade pressure surface 103 d.
The diffuser splitter blade suction surface 103c of the diffuser splitter blade 103 faces the main blade pressure surface 102d of the diffuser main blade 102 adjacent to one side, and the diffuser splitter blade pressure surface 103d of the diffuser splitter blade 103 faces the main blade suction surface 102c of the diffuser main blade 102 adjacent to the other side. That is, the diffuser main vane 102 and the diffuser splitter vane 103 have the same bending direction.
In the present invention, the radial air flow channel 104 and the axial air flow channel 105 are both non-axisymmetric channels, which is convenient for adapting to the non-axisymmetric centrifugal impeller 200.
In some embodiments, the connection surface 102e on each diffuser main blade 102 connecting the main blade suction surface 102c and the main blade pressure surface 102d is an arc surface, and the connection surfaces 102e on all the diffuser main blades 102 are located on the same cylindrical surface, so that the air flow is uniformly discharged from the diffuser 100.
In some embodiments, the angle γ that the main blade suction surface 102c makes with the terminal end face of the first radial passage 104a is greater than or equal to 80 °, i.e., the angle γ that the main blade suction surface 102c makes with the outlet flow face HI of the first radial passage 104a is greater than or equal to 80 °, to reduce flow losses.
In order to further reduce the flow loss of the air stream, the invention discloses that the first radial passage 104a and the second radial passage 104b respectively transit into the axial air stream passage 105 in an arc shape.
In some embodiments, the axial flow passage 105 has a gradually increasing cross-section in a direction away from the axis of the diffuser body 101, and is approximately trapezoidal as shown in FIG. 3.
The invention has the following advantages:
(1) radial and axial integrated diffusion is adopted, so that the turning channel loss is small, and the pneumatic performance is good;
(2) the diffuser main blade 102 and the diffuser splitter blade 103 are both composed of simple straight line segments and arc line segments, and the flow channel is simple and convenient to process;
(3) the design of non-axisymmetric diffusion is adopted, and the design of matching with the large and small blade channels of the centrifugal impeller 200 can be realized;
(4) the front ends of the diffuser main blade 102 and the diffuser splitter blade 103 are both wedge-shaped, so that the diffuser main blade and the diffuser splitter blade can adapt to supersonic incoming flow and reduce total pressure loss of the diffuser 100.
As shown in fig. 4 and 5, a second aspect of the present invention provides a centrifugal compressor 1000 comprising a centrifugal impeller 200 and a diffuser 100 as in any one of the embodiments described above.
The centrifugal impeller 200 is rotatably installed in the installation hole 101a of the diffuser 100, and the centrifugal impeller 200 includes a first blade 201 and a second blade 202, and along the axial direction of the centrifugal impeller 200, the lengths of the first blade 201 and the second blade 202 are different, and the number of the first blade 201 and the second blade 202 is plural, and the first blade 201 and the second blade 202 are alternately arranged along the axis of the centrifugal impeller 200.
Since the centrifugal compressor 1000 provided by the present invention includes the diffuser 100 in any one of the above embodiments, the diffuser 100 has the beneficial effects that the centrifugal compressor 1000 disclosed by the present invention includes.
In a third aspect, the present invention provides a method of compressing gas, including:
providing a centrifugal compressor 1000 as in the previous embodiment;
starting the centrifugal impeller 200 to make the centrifugal impeller 200 rotate to do work, and sucking air into the centrifugal impeller 200 along the axial direction of the centrifugal impeller 200 and compressing the air;
the air enters the first radial passage 104a and the second radial passage 104b of the diffuser 100 in the radial direction of the centrifugal impeller 200, makes a 90 ° turn, enters the axial flow passage 105 of the diffuser 100, and exits the diffuser 100.
It should be noted that the terms indicating the orientation herein are set in the direction of fig. 2, and are used for convenience of description only, and do not have any other specific meanings.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims (10)

1. A diffuser, comprising:
the centrifugal impeller diffuser comprises a diffuser main body, wherein the axis of the diffuser main body is provided with a mounting hole for mounting a centrifugal impeller;
the diffuser main blades and the diffuser splitter blades are arranged in a plurality, and the diffuser main blades and the diffuser splitter blades are arranged on the diffuser main body at intervals in a staggered manner along the axis of the diffuser main body;
the diffuser main blades extend from the radial end surface of the diffuser main body to the longitudinal end surface, and a radial airflow channel and an axial airflow channel which are communicated are formed between the adjacent diffuser main blades in an enclosing manner;
the diffuser splitter blade is arranged on the radial end face of the diffuser main body and divides the radial airflow channel into a first radial channel and a second radial channel.
2. The diffuser of claim 1, wherein the diffuser main vane includes a first wedge portion and a first arcuate portion having a first end integrally connected to the first wedge portion;
the end part of the wedge angle of the first wedge-shaped part is flush with the hole wall of the mounting hole, and two side wall surfaces of the first wedge-shaped part are respectively tangent to two side wall surfaces of the first arc-shaped part;
the second end of the first arc-shaped part extends out of the axial end face of the diffuser body by a preset length, and the part, extending out of the axial end face of the diffuser body, of the first arc-shaped part adjacent to the first arc-shaped part is surrounded by an axial airflow channel.
3. The diffuser of claim 2, wherein the diffuser splitter vane includes a second wedge portion and a second arcuate portion having a first end integrally connected to the second wedge portion;
the tip of the wedge angle of second wedge portion with the pore wall parallel and level of mounting hole, just the both sides wall face of second wedge portion respectively with the both sides wall face of second wedge portion is tangent to be set up, just the second end of second arc portion with the axial end face parallel and level of diffuser main part.
4. The diffuser of claim 3, wherein a cross-section A at any one of the first radial passage or the second radial passage and a throat section A of the first radial passage or the second radial passage t The ratio of (A) satisfies the following formula:
Figure FDA0003782500830000021
wherein L represents the total arc length of the splitter blade of the diffuser, L represents the arc length from the throat of the first radial passage or the second radial passage to the position of the section A, and the first radial passage or the second radial passageThroat position to the channel is 0, C 0 Representing the area change coefficient, and taking the value of 1-5;
and/or
A wedge angle of the first wedge portion is greater than or equal to 5 degrees and less than or equal to 10 degrees;
the second wedge portion has a wedge angle greater than or equal to 5 ° and less than or equal to 10 °.
5. The diffuser of claim 1 wherein one side wall surface of a main vane of the diffuser is a main vane suction surface and the other side wall surface is a main vane pressure surface;
one side wall surface of the splitter blade of the diffuser is a suction surface of the splitter blade, and the other side wall surface of the splitter blade is a pressure surface of the splitter blade;
the diffuser splitter blade is characterized in that the splitter blade suction surface of the diffuser splitter blade and the main blade pressure surface of the main blade of the diffuser adjacent to one side are arranged face to face, and the splitter blade pressure surface of the diffuser splitter blade and the main blade suction surface of the main blade of the diffuser adjacent to the other side are arranged face to face.
6. The diffuser of claim 5 wherein a connecting surface on each of the diffuser main vanes that connects the suction surface of the main vane to the pressure surface of the main vane is an arcuate surface, and the connecting surfaces on all of the diffuser main vanes are on the same cylindrical surface.
7. The diffuser of claim 5, wherein the angle formed by the suction surface of the main vane and the terminal end surface of the first radial passage is greater than or equal to 80 °;
the first radial channel and the second radial channel are respectively in arc transition to the axial airflow channel.
8. The diffuser of any of claims 1-7, wherein the axial flow passage has a progressively larger cross-section in a direction away from an axial centerline of the diffuser body.
9. A centrifugal compressor comprising a centrifugal impeller and a diffuser according to any one of claims 1 to 8;
the centrifugal impeller is rotatably installed in the mounting hole of the diffuser, and the centrifugal impeller comprises a first blade and a second blade, and the first blade and the second blade are different in length in the axial direction of the centrifugal impeller, and the number of the first blade and the second blade is multiple and is arranged along the axis of the centrifugal impeller at intervals in a staggered mode.
10. A method of compressing gas, comprising:
providing a centrifugal compressor as claimed in claim 9;
starting the centrifugal impeller to enable the centrifugal impeller to rotate to do work, and sucking air into the centrifugal impeller along the axial direction of the centrifugal impeller and compressing the air;
air enters a first radial passage and a second radial passage of the diffuser along the radial direction of the centrifugal impeller, enters an axial airflow passage of the diffuser after turning for 90 degrees and is discharged out of the diffuser.
CN202210933063.7A 2022-08-04 2022-08-04 Diffuser, centrifugal compressor and air compression method Pending CN115111200A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210933063.7A CN115111200A (en) 2022-08-04 2022-08-04 Diffuser, centrifugal compressor and air compression method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210933063.7A CN115111200A (en) 2022-08-04 2022-08-04 Diffuser, centrifugal compressor and air compression method

Publications (1)

Publication Number Publication Date
CN115111200A true CN115111200A (en) 2022-09-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210933063.7A Pending CN115111200A (en) 2022-08-04 2022-08-04 Diffuser, centrifugal compressor and air compression method

Country Status (1)

Country Link
CN (1) CN115111200A (en)

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