JP3110296B2 - Multi-wing fan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-blade fan used for blowing gas such as air or gas.

[0002]

2. Description of the Related Art In general, an impeller, which is formed by arranging, on a circumference, elongated blades which are concavely curved with respect to the direction of rotation, has a casing formed so as to traverse a curved flow passage from an intake port to a discharge port. A multi-blade fan rotatably supported therein can obtain a wide band-shaped discharge flow, and thus has been widely used in air conditioners and the like.

[0003]

However, as shown in FIG. 1 of Japanese Utility Model Laid-Open Publication No. 4-129984, the above-mentioned multi-blade fan rotates a support shaft protruding at both ends in the longitudinal direction of the impeller by means of bearings. Because it is a double-supported structure that freely supports, when used for high-temperature gas blowing in heating furnaces, etc.
In order to maintain bearing lubrication, the multi-blade fan could not be inserted into the furnace of the heating furnace and had to be installed outside the furnace, so the installation space was large and suction was required between the furnace and the furnace. Or because it is necessary to provide a duct for discharge,
There has been a problem that equipment costs increase as well as installation space.

The present invention solves the above-mentioned conventional problems, and can be inserted and installed in the atmosphere of a device to be blown, such as a heating furnace, so that the installation space is small and the duct can be omitted or simplified. Another object of the present invention is to provide a cantilevered multi-blade fan capable of obtaining a wide band-shaped discharge flow.

[0005]

According to a first aspect of the present invention, a multi-blade fan has a longitudinal end of a body plate forming a curved flow passage from a suction port to a discharge port, and an impeller is attached to an inner wall portion. A casing having a through-hole and a flange plate attached to the outer wall side, the casing being fixed to the inner wall portion and an end plate facing the box body, and a plurality of disk-shaped members arranged in parallel at intervals. An elongated wheel having a concave curved surface in the rotational direction is fixed to the outer peripheral portion of the partition plate side by side, and a mounting plate is fixed to a base end portion, and a housing portion is mounted on the flange plate. A motor for connecting the mounting plate of the impeller to an output shaft penetrating the outer wall of the box and supporting the impeller in a cantilever manner is provided, and the impeller is passed through the base of the impeller through the impeller. The casing is housed in the flow path of the casing and the box body in a state of being fitted in the hole with a clearance. And it features.

The multi-blade fan according to the second invention of this application has a longitudinal end portion of a body plate forming a curved flow passage from the suction port to the discharge port, an inner wall portion having an impeller through hole, and an outer wall. A casing fixed to the inner wall portion of the box body with the flange plate attached to the side and an end plate facing the box body, and an outer periphery of a plurality of disk-shaped partition plates arranged in parallel at intervals And an impeller, in which elongated blades curved concavely with respect to the rotation direction are fixedly arranged side by side, and a mounting plate is fixed to a base end, and an outer wall of the box body having a housing mounted on the flange plate And a motor that cantileverly supports the impeller by connecting a mounting plate of the impeller to an output shaft that penetrates the portion, and accommodates the impeller in a flow path of the casing.

[0007] As a structure for mounting the impeller motor to the output shaft, a boss protrudes from the mounting plate of the impeller and a tapered shaft portion provided on the output shaft of the motor is provided. The impeller is fitted to a tapered hole provided in a boss, and the impeller is connected to the output shaft by tightening a bolt penetrating the mounting plate to the output shaft.At the center of each partition plate of the impeller, A structure in which a bolt insertion hole for bolt tightening is formed is preferable since a long impeller can be firmly attached to the output shaft and can be reliably supported in a cantilever manner.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. In the figure, reference numeral 1 denotes a multi-blade fan, a casing 10 and a housing 4
The motor 3 includes a motor 3 and a wheel 40 mounted on the output shaft 5 of the motor 3 in a cantilever manner. Casing 1
0 is a rectangular suction port 11 extending in the longitudinal direction of the impeller 40.
And a body plate 14 forming an inner peripheral wall surface of the body plate 15 and a body plate 15 forming an outer peripheral wall surface thereof. Both ends in the longitudinal direction are defined by the inner wall 21 of the box 20 and the box 20.
(Specifically, the end plate 1 opposed to the inner wall 21 at an interval)
6 by welding.

As shown in FIGS. 3 and 6, the box 20 has a rectangular parallelepiped shape including an inner wall 21, a short rectangular cylindrical peripheral wall 22, and an outer wall 23. The plate 26 is attached by bolting 27. Exterior wall 2
3 is an outer wall main body 23a that follows the peripheral wall 22, and an outer wall that is fitted into a substantially square hole-shaped mounting hole 24 formed by cutting out a part of the outer wall main body 23a to insert the impeller 40 into the casing 10. The outer wall cover plate 23b is screwed 25 to a flange plate 26.

The leg 4a of the housing 4 of the motor 3
Is attached to the flange plate 26 by bolting 6. Reference numeral 28 (see FIG. 2) denotes a mounting hole formed in the flange plate 26, and a bolt 29 inserted through the mounting hole 28 is tightened to an outer shell plate portion of a furnace wall 61 of the heating furnace, whereby the multi-blade fan 1 is mounted. It is attached to the furnace wall 61. In FIG. 6, 3
1 is an impeller through hole formed in the inner wall 21, 32 is an outer wall cover plate 2.
The shaft through-holes drilled in 3b and the members that fit into these holes will be described later.

On the other hand, the impeller 40 has a plurality of elongated blades 41 having a section curved in a concave shape with respect to the rotation direction arranged side by side on the circumference. A plurality of disk-shaped partition plates 42 are fixed to the outer peripheral portion, and the base end portion is fixed to a disk-shaped mounting plate 43. The partition plate 42 has a slit into which the blade 41 is inserted, cut from the outer peripheral edge, and the blade 41 inserted into the slit is fixed to the partition plate 42 by welding.

Reference numeral 44 denotes a fastening tool insertion hole formed in the center of the partition plate 42. Further, the mounting plate 43 is formed by fixing a mounting disk 43b having the same shape as that of the partition plate 42 to the inside of a thick disk-shaped mounting plate body 43a by welding, and the outer peripheral portion of the mounting disk 43b. And the end of the blade 41 welded to the mounting disk is further welded to the outer peripheral surface of the mounting plate body 43a.

Reference numeral 46 denotes a boss projectingly fixed to the outer surface of the mounting plate 43. A tapered shaft portion 7 provided at an end of the output shaft 5 of the motor 3 is fitted into a tapered hole 47 formed in the boss 46. In rare cases, the impeller 40 is connected to the output shaft 5 and is cantilevered by tightening the bolt 8 penetrating the mounting plate 43 to the output shaft 5.

When the output shaft 5 is thus cantilevered, a part (base) of the impeller 40 is housed in the box 20 of the casing 10 and the other part is housed in the flow path 13. , The partition plate 42 closest to the base end (closer to the mounting plate 43).
Is fitted with a small amount of clearance 33 into the impeller through hole 31 formed in the inner wall 21. The boss 4 of the mounting plate 43
6 is fitted into the shaft through hole 32 in the outer wall 23 of the box 20 with a small amount of clearance 34. 48 is the end plate 1
6 is a short cylindrical stopper with a flange screwed to 49, the cylindrical portion of which is fitted with a small amount of clearance into the tightening tool insertion hole 44 of the leading edge partition plate 42 of the impeller 40;
Even if the impeller 40 is deformed, it is provided to limit the amount of runout of the impeller 40 to prevent breakage and the like, and is desirably provided.

At the time of assembling the multi-blade fan 1 having the above configuration, the motor 3 is mounted on the flange plate 26 with the outer wall cover plate 23b mounted, and the boss 46 of the impeller 40 before being assembled into the casing 10 is attached to the motor. The mounting plate 43 is fitted to the tapered shaft portion 7 of the output shaft 5 of the motor 3, and the mounting plate 43 is fastened and fixed to the output shaft 5 by bolts 8. This tightening is performed by each partition plate 42 as shown in FIG.
By performing a tightening operation from the tip end side of the impeller 40 through a long box spanner-shaped tightening tool 51 into the tightening tool insertion hole 44, the bolt 8 can be securely and easily tightened. it can. Further, the impeller 40 is firmly connected to the output shaft 5 by fitting the tapered hole 47 and the tapered shaft portion 7 and can be centered coaxially and linearly with the output shaft 5. The one-time support can be reliably and firmly made in a state where there is no run-out or rattling.

Thereafter, the flange plate 26 and the motor 3
40 parts of the impeller integrated with the casing 1 through the casing 20
0, the flange plate 26 is bolted 27 to the box body 20, and the multi-blade fan 1 is assembled. At this time, since the impeller 40 can be inserted into the flow path 13 through the impeller through hole 31, the casing 10 having an integral structure in which both ends of the body plates 14 and 15 are welded to the box 20 and the end plate 16 is provided. Impeller 40
Can be assembled quickly and easily.
The multi-blade fan 1 having the portion is obtained.

The obtained multi-blade fan 1 has a casing 10 in a square mounting hole 62 provided in a furnace wall 61 of a heating furnace 60.
Part of the furnace wall 6 with the bolt 29
1 and fastened to the furnace wall 61. Impeller 4
0 and the casing 10 are attached to the furnace wall 6.
The cantilever is supported by the flange plate 26 fixed to the first. Since the multi-blade fan 1 has only three motor protrusions outside the furnace, the installation space is small, and the space for the entire heating furnace 60 is also small. The impeller 40 cantilevered on the output shaft 5
By rotating the furnace, the atmosphere in the furnace of the heating furnace 60 is sucked from the suction port 11 and discharged from the discharge port 12 into the furnace, whereby a desired blowing action is obtained for the atmosphere in the furnace.

A casing 1 is provided in a mounting hole 62 of a furnace wall 61.
The box 20 is inserted between the inside of the furnace and the outside of the furnace, and an outermost partition plate 42 is provided in the impeller through hole 31 of the inner wall 21 of the box 20. The boss 46 is fitted with a small amount of clearance 34 in the shaft through hole 32 of the outer wall 23, and a mounting plate 43 exists between the shaft through hole 32 and the impeller through hole 31. Therefore, the box 20 has a relatively high closing property, and the inside of the box 20 acts as a heat and noise buffer space between the inside of the furnace and the outside of the furnace. Dissipation of noise is suppressed.

Since the discharge port 12 and the suction port 11 of the casing 10 are open in the furnace, the discharge port 12 and the suction port 11 are not used when circulating the atmosphere in the furnace or installed at a corner of the furnace. There is no need to connect a special duct to the suction port 11, or it is sufficient to simply provide a simple baffle plate between the discharge port 12 and the suction port 11, so that the duct system can be omitted or simplified. It is.

Next, FIG. 7 shows another embodiment of the first invention, and a partition plate 42 near the base end of the impeller 40 in FIG.
Is omitted, and the outer peripheral portion of the blade 41 of the impeller 40 is fitted into the impeller through hole 31 of the box 20 with a small clearance 33. Since other configurations are the same as those of the first embodiment shown in FIGS. 1 to 6, the same or corresponding parts as those of FIG. 6 are denoted by the same reference numerals, and detailed description thereof will be omitted (hereinafter, described below). The same applies to the embodiment.)

In this embodiment, since the box 20 is opened at the impeller through hole 31, the closeability of the box 20 is low, but the inside is low noise or the drainage with a small temperature difference from the outside. It can be used for a drying device such as a furnace or a drying booth without any particular trouble.

In still another embodiment of the first invention shown in FIGS. 8 and 9, the base end of the impeller 40 is arranged near the inner wall 21 of the box 20. In FIG. Board 4
3 is fitted to the impeller through hole 31 of the inner wall 21 with a small clearance 33, and the outer peripheral portion of the base end of the blade 41 is fitted to the impeller through hole 31 with a small clearance 33 in FIG. In addition, the base of the impeller 40 is housed in the box 20. The output shaft 5 of the motor 3 is fitted in the shaft through hole 32 in the outer wall 23 of the box 20 with a small clearance 34.

In the embodiment shown in FIGS. 8 and 9, the mounting plate 43 is located near the impeller through-hole 31.
The closeability of the box 20 is high as in the first embodiment,
The present invention can be suitably used in a case where the internal noise is high or a device having a large internal / external temperature difference.

Next, FIG. 10 shows an embodiment of the second invention, in which the base end of an impeller 40 is located on the furnace inner side (end plate 16 side) of the inner wall 21 of the box 20 and the impeller 40 is housed in the flow channel 13, and the other configuration is the same as that of the first embodiment.

Also in the multi-blade fan 71 of this embodiment, the impeller 40 is connected to the output shaft 5 of the motor 3 and then through the impeller through hole 31 in the same manner as in the above-described embodiments.
It is possible to quickly and easily assemble the multi-blade fan by inserting it into the inside, and if the mounting plate 43 is not largely separated from the inner wall 21, the box 20 can be highly closed and the air-blowing performance can be reduced. The desired blowing action is obtained.

The present invention is not limited to the above embodiments. For example, the outer wall of the box body 20 may be replaced by a single flange plate instead of the double structure of the flange plate 26 and the outer wall 23. The connecting portion between the impeller and the output shaft of the motor may be connected to the mounting plate 43 having no boss 46 by fastening the tip end of the output shaft 5 that passes through the shaft through hole 32 with a clearance. Alternatively, a structure other than the above may be used. Also, the multi-blade fan of the present invention is not limited to a heating furnace, for example, for a drying furnace, a draining furnace, a cooling booth or a cooling zone of a heat treatment furnace or other cooling devices, or a food heating device such as a baking oven, It can be widely used for various applications.

[0027]

As explained above, according to the present invention,
The casing and the impeller unit can be inserted and installed in the atmosphere of the device to be blown, such as a heating furnace or a drying furnace, and the installation space is small. Also, the discharge port and the suction port can be opened in the above atmosphere, so that the duct Can be omitted or simplified to reduce equipment costs.

[Brief description of the drawings]

FIG. 1 is a front view of a multi-blade fan according to an embodiment of the first invention.

FIG. 2 is a side view taken along the line AA in FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a sectional view taken along line CC of FIG. 1;

FIG. 5 is a sectional view taken along line DD of FIG. 1;

FIG. 6 is a sectional view taken along line EE of FIG. 3;

FIG. 7 is a longitudinal sectional view (corresponding to FIG. 6) of a multi-blade fan showing another embodiment of the first invention.

FIG. 8 is a longitudinal sectional view (corresponding to FIG. 6) of a multi-blade fan showing still another embodiment of the first invention.

FIG. 9 is a longitudinal sectional view (corresponding to FIG. 6) of a multi-blade fan showing still another embodiment of the first invention.

FIG. 10 is a longitudinal sectional view (corresponding to FIG. 6) of a multi-blade fan showing an embodiment of the second invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Multi-blade fan, 3 ... Motor, 4 ... Housing, 5 ... Output shaft, 7 ... Tapered shaft part, 8 ... Bolt, 10 ... Casing, 11 ... Suction port, 12 ... Discharge port, 13 ... Flow path, 14 ...
Body part, 15 body part, 16 end plate, 20 box body, 21 inner wall, 23 outer wall, 23a outer wall body, 23b outer wall cover plate, 26 flange plate, 28 mounting hole, 31 wing Car through hole, 32: Shaft through hole, 33: Clearance, 34: Clearance, 4
0: impeller, 41: blade, 42: partition plate, 43: mounting plate,
44: Tightening tool insertion hole, 46: Boss, 47: Tapered hole,
51: fastening tool, 61: furnace wall, 71: multi-blade fan.

Claims (3)

(57) [Claims] 1. An inner wall of a box body having a longitudinal end portion of a body plate forming a bent flow path from an inlet to an outlet, an impeller through hole in an inner wall portion, and a flange plate attached to an outer wall side. A casing fixed to the portion and an end plate facing the box, and a plurality of disk-shaped partition plates arranged in parallel at intervals, and curved in a concave shape with respect to a rotation direction on an outer peripheral portion of the disk-shaped partition plate. And a mounting wheel fixed to the base end portion, and a mounting portion mounted on the flange plate and attached to the output shaft passing through an outer wall portion of the box body. A motor for connecting the plates to support the impeller in a cantilever manner, wherein the impeller is fitted in the impeller through-hole with a clearance between the base of the impeller and the impeller through hole, A multi-blade fan housed in the box. 2. An inner wall of a box body having a longitudinal end portion of a body plate forming a bent flow path from an inlet to an outlet, an impeller through hole in an inner wall portion, and a flange plate attached to an outer wall side. A casing fixed to the portion and an end plate facing the box, and a plurality of disk-shaped partition plates arranged in parallel at intervals, and curved in a concave shape with respect to a rotation direction on an outer peripheral portion of the disk-shaped partition plate. And a mounting wheel fixed to a base end portion, and a mounting portion mounted on the flange plate and attached to an output shaft passing through an outer wall portion of the box body. A multi-blade fan, comprising: a motor connected to a plate to support the impeller in a cantilever manner, wherein the impeller is housed in a flow path of the casing. 3. A boss protruding from a mounting plate of the impeller, a taper shaft portion provided on an output shaft of the motor is fitted into a tapered hole provided on the boss, and a bolt penetrating the mounting plate is provided. The said impeller is connected to the said output shaft by fastening to an output shaft, and the fastening tool penetration hole for the said bolt fastening is drilled in the center part of each partition plate of the said impeller. 3. The multi-blade fan according to 1 or 2.