CN110296102B

CN110296102B - Integrated fan impeller with two-stage supercharging, fan and train

Info

Publication number: CN110296102B
Application number: CN201810246291.0A
Authority: CN
Inventors: 张莉; 李廷金; 张庆刚; 赵金星; 刘宗祝
Original assignee: CRRC Tangshan Co Ltd
Current assignee: CRRC Tangshan Co Ltd
Priority date: 2018-03-23
Filing date: 2018-03-23
Publication date: 2021-10-22
Anticipated expiration: 2038-03-23
Also published as: CN110296102A

Abstract

The invention relates to a two-stage supercharging integrated fan impeller, which comprises a plurality of blade groups, a shaft disc, a rear disc and a front disc, wherein the shaft disc groups are distributed in an annular array; each blade group comprises a plurality of airfoil blades, a first blade and a second blade, the axis of the impeller is used as the center, the disc surface of the rear disc is arranged into an outer ring surface, a middle ring surface and an inner ring surface from the edge to the center, the airfoil blades are distributed on the outer ring surface, the first blade is installed on the middle ring surface, one end of the first blade is connected with one airfoil blade which is distributed and positioned near the middle among the airfoil blades, the second blade is installed on the middle ring surface and the inner ring surface, and one end of the second blade is connected with the airfoil blade which is distributed and positioned near the side among the airfoil blades. The impeller has the characteristics of high efficiency, high air pressure and small relative diameter, and can effectively meet the cooling requirement of plateau operation on the train aiming at the characteristics of high pressure, large air volume and small volume required by a motor train unit running on plateau.

Description

Integrated fan impeller with two-stage supercharging, fan and train

Technical Field

The invention relates to the field of fans of motor train units, in particular to a two-stage supercharging integrated fan impeller, a fan and a train.

Background

In China, vast members and great elevation difference in the east and west areas result in great atmospheric pressure difference in various areas, thin air in plateau areas and low atmospheric pressure. The diesel locomotive runs on the plateau, and power adjustment, namely power reduction application is generally carried out in consideration of low atmospheric pressure. However, the motor train unit is generally required to be used without power reduction on the plateau.

The motor train unit is not used for reducing power on the plateau, and the heating value of each power consumption device on the motor train unit is equivalent to that of the plateau. In order to ensure long-term stable operation of equipment adopting air cooling, such as a traction motor and the like, in plateau operation, air with the same mass flow as that in plain operation needs to be kept for cooling. Since the plateau atmosphere pressure is low and the air density is low, the same mass flow rate requires a larger volume flow rate of air to ensure the cooling effect.

According to the empirical formula P of the air resistance of the pipe network, namely C + KQ2(P is the pipe network resistance, C is the additional resistance of the pipe network and the quantity irrelevant to the air flow, including the negative pressure caused by the running of the motor train unit, K is the pipe network resistance coefficient and only relevant to a pipe network system, and Q is the volume flow of cooling air), the air resistance of the pipe network is in direct proportion to the square of the volume flow of the air. After the motor train unit is on a plateau, the required volume flow of cooling air is increased, and the resistance of a pipe network is correspondingly increased.

The air supply equipment on the motor train unit is generally a fan. From the fan characteristics, it can be seen that, within the usable range, the fan pressure generally decreases as the fan volumetric flow increases. The resistance of the pipe network is increased along with the increase of the volume flow, and the resistance and the volume flow are mutually contradictory. In order to overcome the resistance of the pipe network and ensure that enough cooling air source is supplied to the heating equipment, the air pressure of the fan needs to be obviously improved. However, on the motor train unit, the appearance of the fan is not allowed to be increased due to the limitation of space size, and the fan can be realized only by optimizing a fan scheme or increasing the rotating speed. The effect of improving the rotating speed is most obvious, but a variable frequency motor is needed, so the cost is obviously increased; meanwhile, the input frequency of a power supply needs to be changed, and a control system of the motor train unit needs to be redesigned, so that the influence is great.

In the existing backward fan impeller, the blades are single backward long blades, and all the blades are uniformly distributed; and a small amount of backward fan impellers adopt long and short blades, but all the long and short blades are uniformly distributed. The existing multi-wing fan wheel, which is one of the backward fan wheels, has a large backward angle and a very large number of blades. Typically a backward fan wheel. The backward fan impeller has the biggest defect that the impeller has the smallest supercharging capacity and the low fan pressure under the precondition of certain impeller size (outer diameter) and fan rotating speed, and cannot meet the design technical requirements.

The multi-wing fan impeller has the main defects of low fan efficiency and high noise under the precondition of certain impeller size (outer diameter) and fan rotating speed. The fans are inefficient, require matching with more powerful motors, result in power exceeding design requirements, and also tend to increase significantly in weight (motor weight increases after motor power increases), resulting in being overweight or uncompetitive.

This patent technique can satisfy under the unchangeable, the complete machine efficiency of fan of overall dimension the prerequisite, improve the wind dress at the middle part of back dish, be fixed with a plurality of blading between back dish and the front disk, it is a plurality of blading pressure to satisfy the big wind volume requirement of EMUs plateau operation.

Disclosure of Invention

In view of the above, embodiments of the present invention are directed to providing a two-stage supercharging integrated fan impeller to solve at least one technical problem in the prior art.

In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows: a two-stage supercharging integrated fan impeller comprises a plurality of blade groups, a shaft disc, a rear disc and a front disc, wherein the shaft disc groups are distributed in an annular array; each blade group comprises a plurality of airfoil blades, a first blade and a second blade, the axis of the impeller is used as the center, the disc surface of the rear disc is arranged into an outer ring surface, a middle ring surface and an inner ring surface from the edge to the center, the airfoil blades are distributed on the outer ring surface, the first blade is installed on the middle ring surface, one end of the first blade is connected with one airfoil blade which is distributed and positioned near the middle among the airfoil blades, the second blade is installed on the middle ring surface and the inner ring surface, and one end of the second blade is connected with the airfoil blade which is distributed and positioned near the side among the airfoil blades.

On the basis of the technical scheme, the invention can be further improved as follows:

preferably, if the distance from the inlet edge of the second blade to the center of the impeller is R1, the distance from the inlet edge of the first blade to the center of the impeller is R2, and the distance from the inlet edge of the airfoil blade to the center of the impeller is R3, (R2-R1)/(R3-R1) is 1/4-1/2.

Preferably, an angle between a flow passage outlet formed between the suction surface of the first blade and the pressure surface of the second blade and the center of the impeller is α, an angle between the flow passage outlet formed between the pressure surface of the first blade and the suction surface of the second blade and the center of the impeller is β, β is greater than α, and (β - α)/(α + β) is 0% to 25%.

Preferably, each blade group comprises five airfoil blades, a first blade and a second blade, the airfoil blades are positioned between the first blade and the second blade, a flow channel formed between a suction surface of the first blade and a pressure surface of the second blade is divided into two flow channels, included angles from outlets of the two flow channels to the center of the impeller are respectively alpha 1 close to the second blade and alpha 2 close to the first blade, the included angle alpha 1 is less than alpha 2, and (alpha 2-alpha 1)/(alpha 2+ alpha 1) is 0-25%.

Preferably, two airfoil blades are arranged between the first blade and the second blade in the downstream adjacent blade group, the two airfoil blades divide a flow channel formed between the pressure surface of the first blade and the suction surface of the second blade in the downstream adjacent blade group into three flow channels, included angles from outlets of the three flow channels to the center of the impeller from downstream to upstream are respectively beta 3, beta 2 and beta 1, the included angle beta 1 < beta 2 < beta 3, and (beta 2-beta 1)/(beta 2+ beta 1) ≈ beta 3-beta 2)/(beta 3+ beta 2) ═ 0-25%.

Preferably, the airfoil blades are convex in the direction of rotation of the impeller, and the first and second blades are convex in the opposite direction of the curvature of the impeller.

Preferably, the side wall of the front plate is arc-shaped or conical arc-shaped.

Compared with the prior art, the invention also provides the fan to solve at least one technical problem in the prior art.

The technical scheme for solving the technical problems is as follows: a fan comprises a volute, a filter, a current collector, a fan impeller and a motor, wherein the fan impeller is installed in the volute, the motor is fixed on the volute, and an output shaft of the motor is connected with a shaft disc; the flow collector is arranged on the side wall, close to the front disc, of the volute, and the outer wall of the flow collector is connected with the filter.

Preferably, the radial unilateral clearance of the current collector is 0.5-1% of the diameter of the fan impeller, and the axial insertion amount is 0.5-1.5% of the diameter of the fan impeller.

Compared with the prior art, the invention also provides a train to solve at least one technical problem in the prior art.

The technical scheme for solving the technical problems is as follows: the train comprises an air supply system, wherein the air supply system comprises a fan, a volute of the fan is provided with a suspension bracket, and the suspension bracket is arranged at the bottom of a train body.

Preferably, a shock absorber is arranged on the suspension bracket.

In conclusion, the beneficial effects of the invention are as follows: the impeller has the characteristics of high efficiency, high air pressure and small relative diameter, and can effectively meet the cooling requirement of plateau operation on the train aiming at the characteristics of high pressure, large air volume and small volume required by a motor train unit running on plateau.

Drawings

FIG. 1 is a schematic front view of a fan wheel according to the present invention;

FIG. 2 is a schematic view of the cross-sectional structure A-A of FIG. 1;

FIG. 3 is a left side view schematic diagram of the fan wheel of the present invention;

FIG. 4 is a right side view schematic diagram of the fan wheel of the present invention;

FIG. 5 is a schematic view of a partial cross-sectional structure of a blower according to the present invention;

FIG. 6 is a schematic perspective sectional view of a blower according to the present invention;

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.

As shown in fig. 1 to 4, the impeller 100 includes a plurality of blade sets 110, a shaft disc 120, a rear disc 130 and a front disc 140, the shaft disc 120 is mounted in the middle of the rear disc 130, the blade sets 110 are fixed between the rear disc 130 and the front disc 140, and the blade sets are distributed in an annular array; each blade group 110 includes a plurality of airfoil blades 113, a first blade 111, and a second blade 112, and the axis of the impeller 100 is used as a center, the disk surface of the rear disk 130 is set from edge to center as an outer annular surface 131, an intermediate annular surface 132, and an inner annular surface 133, the plurality of airfoil blades 113 are distributed on the outer annular surface 131, the first blade 111 is installed on the intermediate annular surface 132, and one end thereof is connected to one airfoil blade 113 of the plurality of airfoil blades 113, which is distributed on the side, and the second blade 112 is installed on the intermediate annular surface 132 and the inner annular surface 133, and one end thereof is connected to the airfoil blade 113 of the plurality of airfoil blades 113, which is distributed on the side.

Preferably, when the distance from the inlet side of the second blade 112 to the center of the impeller 100 is R1, the distance from the inlet side of the first blade 111 to the center of the impeller 100 is R2, and the distance from the inlet side of the airfoil blade 113 to the center of the impeller 100 is R3, (R2-R1)/(R3-R1) is 1/4 to 1/2.

Preferably, an angle between a flow passage outlet formed between the suction surface of the first blade 111 and the pressure surface of the second blade 112 and the center of the impeller 100 is α, an angle between a flow passage outlet formed between the pressure surface of the first blade 111 and the suction surface of the second blade 112 and the center of the impeller 100 is β, β is greater than α, and (β - α)/(α + β) is 0% to 25%.

Preferably, each blade group 110 includes five airfoil blades 113, a first blade 111 and a second blade 112, the airfoil blade 113 located between the first blade 111 and the second blade 112 divides a flow channel formed between a suction surface of the first blade 111 and a pressure surface of the second blade 112 into two flow channels, angles between outlets of the two flow channels and the center of the impeller 100 are α 1 near the second blade 112 and α 2 near the first blade 111, respectively, the angle α 1 is less than α 2, and (α 2- α 1)/(α 2+ α 1) is 0-25%.

Preferably, two airfoil blades 113 are disposed between the first blade 111 and the second blade 112 in the downstream adjacent blade group 110, the two airfoil blades 113 divide a flow channel formed between the pressure surface of the first blade 111 and the suction surface of the second blade 112 in the downstream adjacent blade group 110 into three flow channels, included angles from outlets of the three flow channels to the center of the impeller 100 from downstream to upstream are β 3, β 2, and β 1, respectively, the included angle β 1 < β 2 < β 3, and (β 2- β 1)/(β 2+ β 1) ≈ β 3- β 2)/(β 3+ β 2) ≈ 0-25%.

Preferably, the airfoil vane 113 protrudes outward in the rotation direction of the impeller 100, and the first vane 111 and the second vane 112 are bent outward in the opposite direction in the rotation direction of the impeller 100.

Preferably, the side wall of the front plate 140 is shaped in an arc or a conical arc.

As shown in fig. 5 and 6, the present invention further relates to a fan, which includes a volute 200, a filter 300, a collector 400, the fan wheel 100, and a motor 700, wherein the fan wheel 100 is installed in the volute 200, the motor 700 is fixed on the volute 200, and an output shaft (not shown) of the motor 700 is connected to a shaft disc 120; the collector 400 is mounted on the side wall of the volute 200 close to the front disc 140, and the outer wall of the collector 400 is connected with the filter 300.

Preferably, the radial unilateral clearance of the current collector 400 is 0.5% -1% of the diameter of the fan impeller 100, and the axial insertion amount is 0.5% -1.5% of the diameter of the fan impeller 100.

The invention also relates to a train, which comprises an air supply system, wherein the air supply system comprises the fan, the volute 200 of the fan is provided with a suspension bracket 500, and the suspension bracket 500 is arranged at the bottom of the train body.

Preferably, a shock absorber 600 is arranged on the suspension bracket 500.

The fan wheel 100 of the present invention may be considered to be a combination wheel of a rear-facing wheel and a multi-bladed fan wheel. The advantage of this scheme has simultaneously to the characteristics such as efficient, available flow range width of fan, has the characteristics that the flow of multi-wing fan is big, the wind pressure is high simultaneously. When the impeller is used in plateau, the air pressure is obviously insufficient when the impeller is used alone; by adopting the multi-wing fan, the multi-wing fan has low efficiency and super power, so that the application requirements can not be met.

In one embodiment, the fan impeller of the present invention is composed of 8 second blades 112, 8 first blades 111, and 40 airfoil blades 113. The 16 airfoil blades 113 are respectively connected with the second blade 112 and the first blade 111.

The inlet edge of the first vane 111 is required to be arranged behind the throat of the second vane 112, and the distance from the throat is determined so as not to affect the inlet of the impeller. A certain dependency relationship exists among a distance R1 from the air inlet edge of the second blade 112 to the impeller center, a distance R2 from the air inlet edge of the first blade 111 to the impeller center and a distance R3 from the air inlet edge of the airfoil blade to the impeller center, and through three-dimensional flow field simulation calculation, the recommended range of (R2-R1)/(R3-R1) is 1/4-1/2.

The 8 second blades 112 and the 8 first blades 111 are respectively and uniformly distributed, but the width of the flow channel between the second blades 112 and the first blades 111 is not uniform. An included angle α from an outlet of a flow channel formed between the suction surface of the first blade 111 and the pressure surface of the second blade 112 to the center of the impeller is smaller than a flow channel included angle β formed between the pressure surface of the first blade 111 and the suction surface of the second blade 112, and a certain relationship exists between the included angles of the two flow channels: (beta-alpha)/(alpha + beta) is 0 to 25%. The differential design of the two flow channels is beneficial to inhibiting the air flow separation generated at the outlet area of the suction surface of the blade, improving the efficiency of the impeller and improving the air pressure. Deviating from this limit, the impeller flow field will deteriorate and both fan efficiency and pressure will decrease.

The 40 airfoil blades 1 are not evenly distributed. Every 5 airfoil blades 1 form a group, each group being evenly distributed around the centre. The airfoil blade 1 divides the flow channel formed between the suction surface of the first blade 111 and the pressure surface of the second blade 112 into two flow channels again, the width of the two flow channels is inconsistent, the included angle α 1 is less than α 2, and (α 2- α 1)/(α 2+ α 1) is 0-25%. In a similar way, the included angle β 1 is greater than β 2 and greater than β 3, and (β 2- β 1)/(β 2+ β 1) is approximately equal to (β 3- β 2)/(β 3+ β 2) ═ 0-25%; (beta-alpha)/(beta + alpha) is 0-25%.

The function of the fan of the present invention is to convert the mechanical energy transmitted by the motor to the impeller into potential energy (air pressure increase) and kinetic energy (air velocity increase) of the air. The fan impeller 100 and the front current collector 400 are matched, and the radial unilateral clearance is generally 0.5-1% of the diameter of the impeller; the axial insertion amount is generally 0.5-1.5% of the diameter of the impeller. The current collector 400 and the front disc arc of the fan impeller 100 have approximate arc transition. The volute 200 collects high velocity, high pressure air from the fan wheel 100 and delivers it to the following equipment where the air is needed.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., 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 are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The two-stage supercharging integrated fan impeller is characterized by comprising a plurality of blade groups, a shaft disc, a rear disc and a front disc, wherein the shaft disc is arranged in the middle of the rear disc, the blade groups are fixed between the rear disc and the front disc, and the blade groups are distributed in an annular array; each blade group comprises a plurality of airfoil blades, a first blade and a second blade, the axis of the impeller is used as the center, the disc surface of the rear disc is arranged into an outer ring surface, a middle ring surface and an inner ring surface from the edge to the center, the airfoil blades are distributed on the outer ring surface, the first blade is installed on the middle ring surface, one end of the first blade is connected with one airfoil blade which is distributed and positioned near the middle of the airfoil blades, the second blade is installed on the middle ring surface and the inner ring surface, and one end of the second blade is connected with the airfoil blade which is distributed and positioned near the side of the airfoil blades;

setting an included angle from a flow channel outlet formed between the suction surface of the first blade and the pressure surface of the second blade to the center of the impeller to be alpha, setting an included angle from the flow channel outlet formed between the pressure surface of the first blade and the suction surface of the second blade to the center of the impeller to be beta, wherein beta is larger than alpha, and (beta-alpha)/(alpha + beta) is 0-25%;

if the distance from the air inlet edge of the second blade to the center of the impeller is R1, the distance from the air inlet edge of the first blade to the center of the impeller is R2, and the distance from the air inlet edge of the airfoil blade to the center of the impeller is R3, (R2-R1)/(R3-R1) is 1/4-1/2;

two airfoil blades are arranged between the first blade and the second blade in the downstream adjacent blade group, a flow channel formed between the pressure surface of the first blade and the suction surface of the second blade in the downstream adjacent blade group is divided into three flow channels by the two airfoil blades, included angles from outlets of the three flow channels to the center of the impeller from downstream to upstream are respectively beta 3, beta 2 and beta 1, the included angle beta 1 is more than beta 2 and less than beta 3, and (beta 2-beta 1)/(beta 2+ beta 1) is approximately equal to (beta 3-beta 2)/(beta 3+ beta 2) which is 0-25%.

2. The two-stage supercharging integrated fan impeller according to claim 1, wherein each blade group comprises five airfoil blades, a first blade and a second blade, the airfoil blades located between the first blade and the second blade divide a flow passage formed between a suction surface of the first blade and a pressure surface of the second blade into two flow passages, the outlet of each flow passage has an included angle α 1 close to the second blade and an included angle α 2 close to the first blade, the included angle α 1 < α 2, and (α 2- α 1)/(α 2+ α 1) is 0-25%.

3. The two-stage supercharging integrated fan impeller according to claim 1, wherein said airfoil blades are convex in the direction of impeller rotation, and said first and second blades are convex in the opposite direction of impeller rotation.

4. The two-stage supercharging integrated fan impeller according to claim 1, wherein the side wall of the front disk is arcuate in shape.

5. The two-stage supercharging integrated fan impeller according to claim 1, wherein the side wall of the front disk is shaped like a conical arc.

6. A fan comprising a volute, a filter, a collector, a fan wheel according to any one of claims 1 to 5, and a motor, wherein the fan wheel is mounted in the volute, the motor is fixed on the volute, and an output shaft of the motor is connected with a shaft disc; the flow collector is arranged on the side wall, close to the front disc, of the volute, and the outer wall of the flow collector is connected with the filter.

7. The fan according to claim 6, wherein the radial unilateral clearance of the current collector is 0.5-1% of the diameter of the fan impeller, and the axial insertion amount is 0.5-1.5% of the diameter of the fan impeller.

8. The train is characterized by comprising an air supply system, wherein the air supply system comprises the fan as claimed in claim 6 or 7, a suspension bracket is arranged on a volute of the fan, and the suspension bracket is installed at the bottom of a train body.

9. The train of claim 8, wherein a shock absorber is provided on the suspension.