JPH0341119Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to the structure of a blower.

FIG. 1 is a side view of a blower driven by a dual support belt, and FIG. 2 is a front view of FIG. 1. A blower 2 is fixed on a base 1 framed in a rectangular shape, and the base 1
A motor 4 is fixed on a motor base 3 that extends across the shaft, and a belt 8 is wound between a pulley 5 fixed to the shaft end of the motor 4 and a pulley 7 fixed to a shaft 6 of the blower.

FIG. 3 shows a conventional example, and is an enlarged sectional view taken along the line AA in FIG. 1, and FIG. 4 is an exploded perspective view of the casings shown in FIGS. 1 and 2.

The blower casing 9 is made up of axially divided half casings 10 and 11 that are joined together by welding, press rolling, etc., and each is divided into two parts, with casing side plates 12 and 13 and outer circumferential plate 1, respectively.
4 are integrally molded. A discharge flange 16 is provided at the opening edge of the discharge port 15. Each of the half casings 10 and 11 is provided with a circular opening 17. Reference numeral 18 denotes a casing tongue portion, which is a separate member welded to the casing pieces 10 and 11.

The drive side casing leg 19 and the suction side casing leg 21 are in contact with the side plates 12 and 13 of the blower casing 9 and are fixed by bolts 23 and 24.
5 are fastened together with the bolt 24. The drive side and suction side casing legs 19 and 21 have a generally semicircular upper part and a square lower part, and are integrally surrounded by a flat plate member having such a shape and are provided with a rib member. The lower end surface of the rib member can be brought into contact with and fixed to the base 1. Suction cone 25
A bearing stand 27 is integrally formed by welding. A bearing housing 28 containing a self-aligning ball bearing 29 is fixed to the bearing stand 27 . The drive-side casing leg 19 covers the opening 17 of the side plate 12, and has a hole 30 formed in the same center as the center of the opening 17 through which the shaft 6 is inserted. A bearing housing 32 containing a shaped ball bearing 31 is fixed.

The shaft 6 is supported by ball bearings 29 and 31.
In the blower casing 9, an impeller 33 is fixed via a boss 34, and a pulley 7 is fixed to the shaft end.

Due to the energization of the motor 4, the belt 8 is
When the pulley 7 is rotated through the shaft 6 and the impeller 33 is rotated through the shaft 6, the pressure of the air sucked in from the suction cone 25 is increased and the air is transferred to the blower casing 9 and the impeller 3.
3, and is discharged from the discharge port 15.

When replacing the suction port in Fig. 3, remove the blower 2 from the base 1, remove the bolts (not shown) fixing the bearing stand 27 and the bearing housing 28, and then remove the blower casing 9 from the drive side and suction side. Bolt 2 fastening the casing legs 19 and 21
3 and 24, the blower casing 9, suction cone 25, and suction side casing leg 21 are separated.
The blower casing 9 and the drive-side casing leg 19 are assembled with the drive-side bearing housing 32, ball bearings 29, 31, suction-side bearing housing 28, shaft 6, pulley 7, and impeller 33 assembled on the drive-side casing leg 19 side. Can be disassembled. That is, in the disassembled state, the blower is disassembled into four parts: the suction cone 25, the suction side casing leg 21, the blower casing 9, the drive side casing leg 19, and the subassembly parts carried by the drive side casing leg 19.

When rearranging, reverse the above procedure and install the suction side casing leg 2.
1 and the suction cone 25 to the one casing 10 side, and use the bolts 24 to attach the drive side casing leg 1.
9 to the single casing 11. Then, the assembly is completed by attaching the bearing housing 28 to the bearing stand 27.

In some conventional blowers, a bearing is provided only on the driving side casing leg 19 to support the shaft 6, and the impeller 33 is supported by cantilever support. In the case of such a cantilevered bearing type, the bearing pedestal 27 is no longer necessary for the suction cone 25.

In a conventional blower, when replacing the suction port, due to play between the bolt hole and the bolts 23, 24, the positions of the casing legs 19, 21 on the drive side and suction side with respect to the blower casing 9 are adjusted, and the shaft 6 etc. required alignment. Therefore, when changing the suction port, it is necessary to change the position of the shaft 6 and align the cores of the impeller 33 and the suction cone 25 to the correct positions each time. Similarly, when attaching and detaching the suction cone 25, drive side casing leg 19, and suction side casing leg 21 in order to change the direction of the discharge port 15, centering of the shaft 6 and the like is required. On the other hand, there is a strong desire to reduce blower noise. In order to improve the suction cone of a blower equipped with a suction section as shown in FIG. 3, it is a condition that the suction noise does not increase at least.

The purpose of this invention is to provide a blower whose suction cone can be easily replaced by improving the suction cone of the blower.

In this invention, openings larger than the diameter of the impeller are provided on both sides of the blower casing, and the openings are of equal size, so that the suction cone and the suction side casing leg can be attached and detached to any one side of the blower casing. A drive side casing leg is removably fixed to the other side of the blower casing, and bearings are provided on only one side of the drive side casing leg side or on both sides of the drive side casing leg side and the suction casing leg side. In a device in which a support shaft of an impeller housed in a blower casing is supported by a bearing, a fitting portion that fits into an opening of the blower casing is provided on the suction side casing leg, and a suction cone is integrally provided following the fitting portion. It is a blower.

Embodiments of this invention will be described below with reference to the drawings. Figure 5 is a vertical cross-sectional view of an embodiment of this invention;
The figure is an exploded perspective view. In FIGS. 5 and 6, the same parts as those of the conventional example explained in FIGS. 1 to 4 are given the same reference numerals, and the explanation thereof will be omitted.

The suction side casing leg 21 is provided with a cylindrical fitting portion 22 that fits into the opening 17 of the blower casing, and a truss-shaped suction cone portion 25' having a rotating curved surface with a quadrant cross section is connected to the fitting portion 22. be installed in one piece. The fitting part 22 is connected to the opening 17 of the blower casing.
The center of the suction cone portion 25' is determined by fitting the suction cone portion 25' into the suction cone portion 25'. Therefore, a bearing housing 28 fixed to a bearing stand 27 provided integrally with the suction cone portion 25'
The bearing 29 inside is always at a constant center, and the suction side casing leg 21 can be rotated by sliding on the part of the fitting part 22 fitted into the opening 17. However, the shaft 6 does not need to be aligned.

Blower casing 9 of drive side casing leg 19
A disk 40 with a cylindrical fitting 39 is fixed to the side, and a hole of the same size as the hole 30 of the drive-side casing leg 19 is provided in the center of the disk 40 . Such a cylindrical fitting portion 39 may be integrally stamped and molded from the drive side casing leg 19.

In such embodiments the blower casing 9
When the driving side casing legs 19 and the suction side casing legs 21 on both sides are replaced, the fitting part 22 of the suction side casing leg and the fitting part 39 of the driving side casing leg fit into the opening 17 of the blower casing, respectively. The center of the shaft 6 is determined without alignment, and therefore the impeller 33 and suction cone portion 25' can be assembled at correct positions without alignment.

Incidentally, even if the driving side casing leg 19 is the conventional casing leg and only the suction side casing leg 21 is made as in the present embodiment, centering between the suction side casing leg, the suction cone, and the casing becomes unnecessary.

As mentioned above, in addition to easily responding to changes in the rotation direction by replacing the suction port side and drive side members, the seventh
As shown in FIGS. 9 to 9, the outlet 15 of the blower 2
If you want to change it, you can do it even more easily.
The order may be from the suction side or from the drive side, but when the bolts 23 that attach the drive side casing leg 19 are removed, the drive side casing leg 19 can be rotated at any angle around the shaft 6 using the opening 17 as a guide. Since it can be rotated, if the female threads of the single casing 10 into which the bolts 23 are screwed are arranged evenly so that the desired number of indexes can be indexed, the driving side casing leg 19 can be rotated and fixed to the single casing 10 with the bolt 23 at an appropriate position. do. Similarly, the bolts 24 are removed, the suction side casing legs 21 are rotated to match the drive side casing legs 19, and the bolts 24 are fixed to the one casing 11. Thus, the discharge port 15 can be selected to face upward in FIG. 7, to the left in FIG. 8, and to the right in FIG. 9. It will be obvious that the outlet 15 can also be provided obliquely or directed downward.

The performance and noise when the conventional blower and the blower of the present invention are operated under the same conditions except for the suction section are shown in Table 10.
As shown in the figure. In Figure 10, the horizontal axis is the rotation speed of the blower 2,
The discharge pressure and sound pressure of the blower 2 are taken on the vertical axis, and the rotation speed-discharge pressure curve 41, 4 is expressed as the performance of the blower.
2, and the curves 41, 41' represent the total pressure, 4
2,42' indicates static pressure. Then, the noise of the blower suction port with respect to the rotation speed is shown by curves 43 and 43',
The noise around the blower is shown by curves 44 and 44'. Curves 42, 43, and 44 shown by solid lines are the blower with suction cone of the present invention, and curves 442' and 44 shown by dotted lines are
43' and 44' are for a conventional blower with a suction cone.

From this diagram, curves 42, 42', curve 4
1 and 41', the solid line and the dotted line almost overlap, and there is almost no change in the performance of the blower, but both the noise at the suction port and the noise around the blower are lower in the blower of the present invention than in the conventional example.

FIG. 11 is a longitudinal sectional view of an embodiment of the cantilever-supported blower of this invention. The same reference numerals as in the previous embodiment are the same, and their explanation will be omitted.

The shaft 6 has a bearing 35 mounted on a bearing housing 38 bolted to the driving side casing leg 19.
It is suspended from 36. Suction side casing leg 21
does not have a bearing stand 27, and the bearing is only on the drive side. In this embodiment, as in the previous embodiment, the direction of the suction port can be changed, and changes in the rotation direction can be easily accommodated. Also, the direction of the discharge port can be changed.

As described above, in the blower of this invention, the suction side casing leg has a fitting part that is guided to the opening provided in the side plate of the blower casing, and the suction cone part is integrally provided following the fitting part. (1) The suction cone and the casing leg on the suction cone side are attached to the casing without alignment.

(2) Reinforces the casing legs on the suction side.

(3) When changing the suction direction and discharge direction, the fitting part of the suction casing leg serves as a guide, making reassembly easier.

(4) Has a noise reduction effect.

(5) Easily adapts to differences in rotational direction.

If the driving side casing leg is provided with a fitting portion so as to be guided to the casing opening, it is easy to change the suction port and the discharge port together with the guide provided on the suction side casing leg.

[Brief explanation of the drawing]

Fig. 1 is a side view of the blower, Fig. 2 is a front view of Fig. 1, Fig. 3 is a conventional example and an enlarged sectional view taken along line A-A in Fig. 1, and Fig. 4 is an exploded view of the casings in Fig. 3. A perspective view, FIG. 5 is a longitudinal sectional view showing an embodiment of this invention,
Figure 6 is an exploded perspective view of the casings in Figure 5, Figures 7, 8, and 9 are side views showing the action of this invention, and Figure 10 is the performance and noise of this invention and the conventional example. FIG. 11 is a longitudinal sectional view of another embodiment of this invention. 1...Base, 2...Blower, 3...Motor base, 4...Motor, 5...Pulley, 6...Shaft,
7... Pulley, 8... Belt, 9... Blower casing, 10, 11... Single casing, 12, 1
3...Casing side plate, 14...Outer peripheral plate, 15...
...Discharge port, 16...Discharge flange, 17...Opening, 18...Casing tongue, 19...Drive side casing leg, 21...Suction side casing leg, 22
... Fitting part, 23, 24 ... Bolt, 25 ... Suction cone, 25' ... Suction cone part, 27 ... Bearing stand, 28 ... Bearing housing, 29 ... Ball bearing, 30 ... Hole, 31... Ball bearing, 32... Bearing housing, 33... Impeller, 34... Boss, 3
5, 36...Bearing, 38...Bearing housing, 3
9... Fitting portion, 40... Disc, 41, 42... Discharge pressure curve, 43, 44... Curve.

Claims (1)

[Scope of utility model registration request] An opening larger than the diameter of the impeller is provided on both sides of the blower casing, the openings are of equal size, and a suction cone and a suction side casing leg are removably provided on any one side of the blower casing, The drive side casing leg is removably fixed to the other side of the blower casing, and bearings are provided on only one side of the drive side casing leg side or on both sides of the drive side casing leg side and the suction casing leg side, and the blower is A blower that supports a support shaft of an impeller housed in a casing, and has a fitting part that fits into an opening of the blower casing on the suction side casing leg, and a suction cone integrally provided next to the fitting part.