JPH0381599A - Scroll case for centrifugal type blower - Google Patents

Abstract

PURPOSE:To restrain the resonance of a front plate and improve workability for assembly by forming a reinforcement rib on an external plate having an insertion hole for a fan, or an internal plate having an intake port on the inner surface thereof. CONSTITUTION:A front plate 7 comprises a combination of an external plate 9 with the outside thereof fixed to a side plate 8, and an internal plate 11 fixed to the inner surface of the aforesaid external plate 9 and having an air intake port on the inner surface thereof. The external plate 9 is a thin metal plate integrally brazed with the side plate 8 and a rear plate 6. In addition, an insertion hole 12 is formed in the inner surface of the aforesaid metal plate for inserting a fan 2 in a scroll case 4. A reinforcement rib 13 is formed all along the inner end of the external plate 9. Also, a reinforcement rib 14 is formed all around the intake port 10 of the internal plate 11. According to the aforesaid construction, the resonance of the front plate 7 can be restrained and workability for assembly can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a scroll case for reducing the noise of a centrifugal blower.

L Conventional technology] The scroll case has a rear plate that serves as a surface for mounting the motor;
It consists of a front plate with an air intake port, and a side plate that connects the rear plate and the front plate and covers the area around the fan. The front plate has an outer circumferential plate with an insertion hole into which the fan is generally inserted, and a suction hole on the inner circumference, which is inserted into the WJ insertion hole of this outer circumferential plate for the purpose of inserting the fan from the scroll case. It is made by combining an inner circumferential plate.

[Problems to be Solved by the Invention] The outer peripheral plate and the inner peripheral plate are generally thin. For this reason, the front plate, which has a relatively large area, vibrates due to the vibrations generated by the motor and the vibrations generated when the fan stirs the air when the motor moves, and the amplitude increases due to resonance. It amplifies and generates vibration noise.

Further, the conventional outer circumferential plate and inner circumferential plate are only provided with positioning when removing the inner circumferential plate, making it difficult to position the inner circumferential plate when attaching it to the outer circumferential plate.

SUMMARY OF THE INVENTION An object of the present invention is to provide a scroll case for a centrifugal blower that suppresses the resonance of the front plate and suppresses the vibration noise that rises to the front plate, and to provide a scroll case for a centrifugal blower that allows easy positioning of the inner peripheral plate. .

[Means for Solving the Problems] In order to achieve the above object, the scroll case of the centrifugal blower of the present invention employs the following technical means.

(Means Corresponding to Claim 1) A scroll case of a centrifugal blower has an outer circumferential plate provided with an insertion hole into which a fan is inserted, and is inserted into the push-in hole of this outer circumferential plate, and has a suction 1 in the inner I91. It has a front plate that introduces an inner circumferential plate.

Then, reinforcing ribs were formed on the outer circumferential plate, the j-shaped inner circumferential plate, or the glazed inner circumferential plate.

(Means according to claim 2) 3. The scroll case of the centrifugal blower uses reinforcing ribs formed on the inner circumferential plate or the outer circumferential plate for positioning the inner circumferential plate.

[Effects of the Invention] The present invention configured as described above operates as follows.

(Operations Corresponding to Claim 1 and Effects of the Invention) When the 161-strong ribs are formed on the outer circumferential plate, deformation of the outer circumferential plate in the thickness direction is prevented by the 611-strong ribs.

As a result, even when the blower motor operates and vibrations are transmitted to the front plate, the reinforcement ridges on the outer circumferential plate suppress the amplification of the amplitude.

By suppressing the amplification of the amplitude of the outer circumferential plate, the amplification of the amplitude of the inner circumferential plate can also be suppressed. As a result, resonance of the front plate is suppressed, and vibration noise during motor operation is suppressed.

Similarly, if a reinforcing rif is formed on the inner circumferential plate, the inner circumferential plate becomes
# Deformation of the inner circumferential plate in the thickness direction is prevented by the strong rift.

As a result, even if the blower motor moves once and the vibration is transmitted to the glaze, the amplification of the amplitude of the inner peripheral plate can be suppressed. By suppressing the vibration of the inner circumferential plate, amplification of the amplitude of the outer circumferential plate is also suppressed. As a result, resonance of the front plate is suppressed, and vibration f5J@ noise during motor operation is suppressed.

(Operations corresponding to claim 2 and effects of the invention) 'KI strong ribs are formed on the inner circumferential plate, and the Pgi strong ribs are aligned with the push-in holes in the outer circumferential plate. Alternatively, the reinforcing riff of the inner peripheral plate can be replaced with the S of the outer peripheral plate.
? Adjust as you see fit. As a result, the inner circumferential plate is positioned, and the ease of assembly is improved.

Similarly, a reinforcing ridge is formed on the outer circumferential plate, and the reinforcing ridge is aligned with the peripheral edge of the inner circumferential plate. Alternatively, align the reinforcing ribs of the outer peripheral plate with the recesses of the inner peripheral plate. This allows positioning of the inner circumferential plate and improves assembly performance.

[Example] Next, a scroll case of a centrifugal blower according to the present invention will be described based on an example (not shown).

FIG. 1 shows a first embodiment of the invention.

The centrifugal fan 1 is widely used for supplying air for combustion to the combustion section, supplying heated and cooled air indoors, and performing ventilation.
, an electric motor 3 that drives the fan 2 , and a scroll case 4 that covers the fan 2 .

The scroll case 4 includes a rear plate 6 in the form of a plate to which the flange 5 of the motor 3 is attached, a front plate 7 in the form of a ring between which the fan 2 is disposed, and a rear plate. It is composed of a side plate 8 that connects the gl4 of the plate 6 and the wl plate 7 and covers the fan 2.

Next, the front plate 7 according to the present invention will be described in detail.

The front plate 7 is a combination of an outer circumferential plate whose outer periphery is fixed to the side plate 8 and an inner circumferential plate 11 which is fixed to the inner circumference of the outer circumferential plate 9 and has an air intake port 10 on the inner circumference. .

The outer circumferential plate 9 is a metal plate that is body-brazed together with the side plates 8 and the rear plate 6, and an insertion hole 12 for inserting the fan 2 into the scroll case 4 is formed on the inner circumference. . In this embodiment, a reinforcing lip 13 is formed around the entire circumference of the inner peripheral end of the outer peripheral plate 9 that forms the insertion hole 12. This reinforcing rib 13 extends the inner peripheral end of the outer peripheral plate 9 into the scroll case 4 by several mm (for example, 1 mm/-3 mm).
) It is formed by bending.

The inner circumferential plate 11 is a thin metal plate that is fixed to the outer circumferential plate 9 with screws after the fan 2 is housed in the fan 1 call case 4. The suction port 10 of the inner circumferential plate 11 is provided in a bell mouth shape to guide air to the inner circumference of the fan 2.

In this embodiment, reinforcing ribs 14 are formed around the entire circumference of the inlet 10 of the inner circumferential plate 11. The reinforcing ribs 14 are formed by punching out intermediate grains 8 between the suction port 10 and the outer peripheral end of the inner circumferential plate 11 toward the inside of the scroll case 4 to form a recessed shape, and the height of the reinforcing ribs 14 is For example, 05Ill111-2mIn is. Note that the width of the reinforcing rib 14 is also several U (for example, 1 nu++-JO
mllI).

The operation of the centrifugal blower 1 equipped with the scroll case 4 described above will be briefly explained.

When the motor 3 is energized, the fan 2 rotates.

At this time, the motor 3 vibrates due to its operation, and air vibrations are generated due to air stirring by the fan 2. These vibrations are transmitted to the front plate 7.

However, the outer peripheral plate 9 of the front plate 7 is prevented from deforming in the thickness direction by the reinforcing ribs 13, and the outer peripheral side of the inner peripheral plate 11 is also prevented from deforming in the thickness direction by the reinforcing ribs 14. It is blocked. In other words, the front plate 7 has an outer circumference &
Due to the synergistic effect of the reinforcing ribs 13 provided on the inner peripheral plate 11 and the reinforcing ribs 14 provided on the inner peripheral plate 11, the front plate 7
deformation in the plate thickness direction is prevented.

As a result, even if the motor 3 operates and vibrations are transmitted to the front plate 7, the amplitude of the front plate 7 is amplified or the two reinforcing riffs 13.
It is suppressed by 14. As a result, resonance of the front plate 7 is suppressed, and vibration noise during operation of the motor 3 is suppressed.

In addition, the reinforcing ribs 14 of the inner circumferential plate 11 are attached to the outer circumferential plate 9 during assembly.
It fits into the insertion hole 12 and does not play the role of determining fw. For this reason, a reinforcing ridge 14 is provided on the internal plate 11 (the horns also have the effect of improving ml adhesion).

FIG. 2 shows a second embodiment.

In this embodiment, a strong ridge 15 is provided with a protruding opening on the entire circumference of the insertion hole 12 of the outer circumferential plate 9, that is, on the entire circumference between the outer circumferential end and the inner circumferential end of the outer circumferential plate 9. A reinforcement rib 16 is provided by bending at the outer peripheral end of the inner peripheral plate 11.The two reinforcement ribs 15 and 16 are formed toward the outside of the scroll case 4.

In addition, the above 1. In the second embodiment, reinforcing ribs are provided on both the inner circumferential plate 11 and the outer circumferential plate 9, but it goes without saying that vibration noise G can be prevented by providing reinforcing ribs only on either one side.

In this case, when the reinforcing ribs 14 are provided in the first embodiment and the reinforcing ribs 15 are provided in the second embodiment, they serve as an attachment method.

FIG. 3 shows a third embodiment.

In this embodiment, a reinforcing ridge 17 is provided on the entire circumference between the outer circumferential edge of the outer circumferential plate 9 and the insertion hole 12 (+] with a reinforcing ridge 17 formed between the outer circumferential edge of the inner circumferential plate 11 and the suction port 12. A 'l'di% ridge 18 that coincides with the reinforcing rib 17 is provided between the two.

In this embodiment as well, the reinforcing ribs 17 and 18 play the role of attachment by fitting.

4 and 5 follow the fourth embodiment.

In this embodiment, radial reinforcing ridges 19 are provided on the inner peripheral plate 11.

In this embodiment as well, the reinforcing ribs 19 fit into the insertion holes 12 of the outer circumferential plate 9 and do not play the role of determining the draw width.

(Modification) Although the outer circumferential plate and the inner circumferential plate 11 are fixed with screws, other means having the same name such as brazing, welding, and joints may be used.

[Brief explanation of drawings]

Figure 1 is a sectional view of a centrifugal blower showing the first embodiment, and the second
The figure is a sectional view of a centrifugal blower showing a second embodiment, FIG. 3 is a sectional view of a centrifugal blower showing a third embodiment, and FIG. 4 is a sectional view of a centrifugal blower showing a third embodiment.
FIG. 5 is a plan view of a centrifugal blower showing an embodiment, and a sectional view taken along line I--I in FIG. 4.

Claims (1)

[Claims] 1) A front plate that combines an outer circumferential plate with an insertion hole into which a fan is inserted, and an inner circumferential plate that is attached to the insertion hole of the outer circumferential plate and has an inlet on the inner periphery. A scroll case for a centrifugal blower comprising: a reinforcing rib formed on the outer peripheral plate or the inner peripheral plate. 2) The scroll case for a centrifugal blower according to claim 1, wherein the reinforcing rib is used for positioning the inner peripheral plate.