JPH08200291A - Impeller for cross flow blower - Google Patents

Abstract

PURPOSE: To improve efficiency and to reduce noise by suppressing an acceleration rate as small as possible at passing time between blades, and decreasing a dynamic friction loss. CONSTITUTION: Relating to an impeller for a cross flow blower, it has a partitioning plate arranged with a prescribed space in a blower axial direction and a blade 1 positioned between these partitioning plates to direct a lengthwise direction in the blower axial direction also to be arranged in a peripheral direction with a prescribed space apart in the vicinity of a peripheral end of the partitioning plate. Accordingly, the blade 1 is formed in a blade shape where its maximum warped position agrees with the center of a blade chord, also a thickness (2Ya ) of the maximum warped position of the blade 1 and a length (t) of a circular arc, connecting between middle points of a circular arc-shaped neutral line of the blades 1 adjacent to each other by the circular are with a blower axis serving as the center, satisfy a relation where 0.1178<=2Ya /t<=0.1330.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impeller of a cross flow fan (cross flow fan) used in an air conditioner or the like.

[0002]

2. Description of the Related Art FIG. 4 is an enlarged cross-sectional view of an essential part of an impeller of a conventional cross flow fan disclosed in, for example, Japanese Utility Model Laid-Open No. 63-54892. In the figure, 1 is a blade arranged in a large number in the circumferential direction between partition plates (not shown) provided at predetermined intervals in the axial direction of the impeller, 9 is the outer circumference of the impeller, 10 is the outer circumference of the impeller, Reference numeral 15 is an inter-blade flow path formed between the adjacent blades 1.

Next, the operation will be described. The blade 1 of the impeller is gradually thickened from the inner circumference 10 to the vicinity of the outer circumference 9 so that the cross-sectional area of the inter-blade flow path 15 becomes equal, and then gradually thinned toward the outer circumference 10 to the rear of the blade 1 and the inter-blade flow. By reducing the negative pressure region in the passage 15 to suppress the generation of a vortex when the air passes through the flow passage and immediately after the passage, the loss of wind pressure due to the vortex is reduced and the efficiency of the blower is improved. There is.

[0004]

Since the impeller of the conventional cross flow fan is constructed as described above, in order to improve the performance of the blower, for example, the diameter of the impeller is increased or the impeller of the impeller 1 is increased. When the chord length is increased, there is a problem in that the thick portion of the blade 1 becomes too thick and the impeller becomes heavy, which causes vibration during operation.

The present invention has been made in order to solve the above problems, and can reduce the weight of the impeller and
An object is to provide an impeller of a low noise and high static pressure type cross-flow blower.

[0006]

According to another aspect of the present invention, there is provided an impeller of a cross-flow fan, comprising partition plates arranged at a predetermined interval in the axial direction of the blower, and a longitudinal direction located between the partition plates. In the impeller of a cross-flow fan, which has a vane arranged in the circumferential direction at predetermined intervals in the vicinity of the outer peripheral edge of the partition plate, the vane has a blade shape in which the maximum warp position coincides with the center of the chord chord. At the same time, the thickness (2
Y _a ) and the length (t) of the arc connecting the midpoints of the arc-shaped neutral lines of the adjacent blades with an arc centered on the blower axis,
It is characterized in that the relationship of 0.1178 ≦ 2Y _a /t≦0.1330 is satisfied.

According to another aspect of the present invention, there is provided an impeller of a cross flow fan, comprising partition plates arranged at a predetermined interval in the axial direction of the blower, and a partition plate located between the partition plates and having a longitudinal direction oriented in the axial direction of the blower. In an impeller of a cross-flow blower having a blade arranged in the circumferential direction at predetermined intervals in the vicinity of the outer peripheral end, the blade has a blade shape in which the maximum warp position matches the center of the blade chord,
The radius (R _A ) of the circle forming the outer peripheral edge of the blade and the half thickness (Y _a ) of the maximum warp position of the blade are 0.5646.
≦ R _A / Y satisfies the _a ≦ .6860 relationship, at the same time the radius of the circle forming the inner peripheral side edge portion of the blade (R _B) and the thickness of the half of the maximum warpage position of the blade and (Y _a) But 0.5646
≦ characterized by satisfying the relation of R _B / Y _a ≦ 0.6860.

[0008]

In the impeller of the cross flow fan according to the first aspect, the speed increase rate is suppressed as much as possible when passing between the blades, and the dynamic friction loss is reduced.

In the impeller of the cross flow fan according to the second aspect, the work amount and the efficiency when passing between the blades are optimized.

[0010]

【Example】

Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. 1 is an enlarged sectional view of an essential part of an impeller of a cross flow fan according to a first embodiment of the present invention. In the figure, 1 is a number of blades (blades) provided in the circumferential direction between partition plates (not shown) arranged at predetermined intervals in the axial direction of the blower, and 3 is a pressure which is a surface directly contacted with the flow. Surface 4 is a suction surface where the flow does not directly contact, 5 is the leading edge of blade 1, 6 is the trailing edge of blade 1, 7
Is the wall thickness of the blade 1 at the maximum warp position (2Y _a ), 8 is the pitch (t) which is the arc length at the maximum warp position between adjacent blades, 9 is the outer circumference of the impeller, and 10 is the inside of the impeller. Zhou, 11
Is a warp line of the blade 1. The wall thickness (2Y _a ) and the blade pitch (t) are 0.1178 ≦ 2Y _a /t≦0.13.
The arrangement satisfies the relationship of 30.

When the blade 1 is made to have a more airfoil shape, compared with the static pressure increase from the thick portion of the blade at the maximum sled position 7 to the trailing edge 6 of the blade, the thickness of the blade from the leading edge 5 to the blade maximum sled position 7 is increased. Value that increases loss due to increase in blade-to-blade flow velocity up to the thick part 0.1178
From the above, the flow velocity between blades at the same air flow becomes slower and the suction surface 4
The flow ratio between the blades 8 and the wall thickness ratio t / 2Y _{a at} the maximum warp position 7 of the blades are arranged within the range of 0.1330 that increases the flow separation loss and increases the loss when passing between the blades. The speed factor is suppressed as much as possible to reduce the dynamic friction loss, and a highly efficient and low noise cross flow fan is realized.

In the cross flow blower in this embodiment, the blade 1 of the impeller passes between the first blades peculiar to the cross flow blower as shown in FIG. 2 because the maximum sled position is at the center of the chord. In the phenomenon that the flow direction at the time (outer peripheral side to the inner peripheral side) and the flow direction passing between the second blades (from the inner peripheral side to the outer peripheral side) are reversed, both work and efficiency, between the first blades At the time of passage, the flow is in a decelerated state, the static pressure is increased, and the kinetic energy obtained as a lift is supplied to the vortex 21 that governs the flow shown in FIG. Furthermore, by optimizing the ratio between the length of the midpoint of the neutral line on the circular arc of the cross section and the similar midpoint of the adjacent blades in the circular arc centered on the fan axis and the thickness of the maximum warp position of the blade, Optimization of work and efficiency during the first blade-to-blade passage as well as the second blade-to-blade passage is achieved.

Example 2. Embodiment 2 of the present invention will be described below with reference to the drawings. FIG. 3 is an enlarged cross-sectional view of a main part of an impeller of a cross flow fan according to a second embodiment of the present invention. In the figure, reference numerals 1 to 11 (excluding 2 and 8) are exactly the same as those in FIG. R _A is a circle forming the outer peripheral side edge portion of the blade 1 radius, R _B is the radius of the circle forming the inner peripheral side edge portions.

A value at which separation noise occurs at the leading edge 5 of the blade 1 and the rotation noise increases, or the blade-to-blade flow velocity changes from the thick portion at the maximum warp position 7 of the blade 1 to the trailing edge 6 of the blade Since the deceleration is too large, the flow separation from the suction surface 4 of the blade becomes large, and the loss becomes large. The ratio of the radius R _A of the circle of the outer peripheral edge of the blade 1 to the half of the wall thickness of the maximum sled position 7 of the blade 1 R _A / Y _a within the range of .686, and the circle of the inner peripheral edge of the blade 1 By arranging the radius R _B and the ratio R _B / Y _{a that} is half the wall thickness of the maximum warp position 7 of the blade 1, optimization of the work amount and efficiency when passing between the blades is achieved, and the efficiency is good, It realizes a low-noise cross-flow blower.

[0015]

The impeller of the cross-flow fan according to the first aspect of the present invention includes partition plates arranged at a predetermined interval in the axial direction of the blower, and the partition plates located between the partition plates and having the longitudinal direction oriented in the axial direction of the blower. In an impeller of a cross-flow fan having blades arranged in the circumferential direction at predetermined intervals in the vicinity of the outer peripheral edge of the plate, the blade has a blade shape whose maximum warp position matches the center of the blade chord, and The thickness (2Y _a ) at the maximum warp position and the length (t) of the arc connecting the midpoints of the arc-shaped neutral lines of the adjacent blades with the arc of the blower axis as a center are 0.1178 ≦ 2
Since a configuration which satisfies the relationship of Y _a /t≦0.1330, by the time of the inter-blade passage is as much as possible Osaekomi dynamic friction losses speed increasing ratio is reduced, efficient becomes low noise.

An impeller of a cross flow fan according to a second aspect of the present invention is a partition plate which is disposed at a predetermined interval in the axial direction of the blower, and a partition plate which is located between the partition plates and whose longitudinal direction is oriented in the axial direction of the blower. In an impeller of a cross-flow blower having a blade arranged in the circumferential direction at predetermined intervals in the vicinity of the outer peripheral end, the blade has a blade shape in which the maximum warp position matches the center of the blade chord,
The radius (R _A ) of the circle forming the outer peripheral edge of the blade and the half thickness (Y _a ) of the maximum warp position of the blade are 0.5646.
≦ R _A / Y satisfies the _a ≦ .6860 relationship, at the same time the radius of the circle forming the inner peripheral side edge portion of the blade (R _B) and the thickness of the half of the maximum warpage position of the blade and (Y _a) But 0.5646
Since ≦ R _B / Y was satisfied the relationship structure of _a ≦ 0.6860, it is optimized workload and efficiency at between blades pass, efficient becomes low noise.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of essential parts of an impeller of a cross flow fan according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating the operation of the impeller of the cross flow fan according to the first embodiment of the present invention.

FIG. 3 is an enlarged sectional view of a main part of an impeller of a cross flow fan according to a second embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view of a main part of a conventional impeller of a cross flow fan.

[Explanation of symbols]

1 blade (blade), 7 blade maximum warp position wall thickness (2Y
_a ), 8 blade pitch at maximum warp position, _RA
The radius of leading edge of the blade, the radius of the trailing edge of the R _B blade.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Teru Takamori 3-18-1, Oga, Shizuoka City Mitsubishi Electric Corporation Shizuoka Factory

Claims (2)

[Claims] 1. A partition plate arranged at a predetermined interval in the axial direction of the blower, and a partition plate located between the partition plates, the longitudinal direction of which is in the axial direction of the blower, and a predetermined interval near the outer peripheral end of the partition plate. In the impeller of a cross-flow fan having a blade arranged in the circumferential direction, the blade has a blade shape in which the maximum warp position matches the center of the blade chord, and the wall thickness of the maximum warp position of the blade is (2Y _a ) and the length (t) of the arc connecting the midpoints of the arc-shaped neutral lines of the adjacent blades with the arc of the blower axis as the center, 0.1178 ≦ 2Y _a / t ≦
An impeller of a cross-flow fan, which satisfies the relationship of 0.1330. 2. A partition plate disposed at a predetermined interval in the blower axial direction, and a partition plate located between the partition plates, the longitudinal direction being oriented in the blower axial direction, and a predetermined interval near the outer peripheral end of the partition plate. In an impeller of a cross-flow fan having a blade arranged in the circumferential direction, the blade has a blade shape whose maximum warp position coincides with the center of the blade chord, and forms an outer peripheral edge portion of the blade. The radius (R _A ) of the circle and the half thickness (Y _a ) at the maximum warp position of the blade are 0.5646 ≦ R _A / Y
satisfy the relationship of _a ≦ .6860, the inner circumference of a circle to form a side edge portion radius of the blade (R _B) and the maximum warpage position of the thickness of half of the vane and (Y _a) but at the same time, 0 0.5646 ≦
An impeller of a cross flow blower, which satisfies the relationship of R _B / Y _a ≦ 0.6860.