JPH08247096A - Casing for blower - Google Patents

Abstract

PURPOSE: To eliminate application work of an adhesive and to reduce cost of a casing for an blower by making a seal part arranged on an edge part of a side plate of the casing for the air blower contact with one or both of a front surface and a back surface of a peripheral plate and blocking a clearance between the peripheral plate and the side plate. CONSTITUTION: A peripheral plate 2 and a side plate 3a are assembled by inserting projected pieces 11... projectively provided on one edge part of the peripheral plate 2 into insertion holes 14... of the side plate 3a at first in case of assembling a casing 1 of a cylindrical multiblade fan consisting of the peripheral plate 2 and two pieces of the side plates 3 (3a, 3b). Thereafter, in the same way, the peripheral plate 2 and the side plate 3b are assembled by inserting each of the projected pieces 11 on the other edge part of the peripheral plate 2 into the insertion holes 14... of the side plate 3b. Thereafter, the projected pieces 11 are deformed by collapsing an upper part of each of the projected pieces 11 projected from each of the insertion holes 14 by a press machine, and both of the side plates 3 are fixed on the peripheral plate 2. At this time, airtightness is secured by making the peripheral plate 2 and the side plates 3 contact with each other through a seal part 15 attached along a margin on the inner surfaces of the side plates 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower casing for a blower that blows air into a water heater, a boiler, an air conditioner and a copying machine.

[0002]

2. Description of the Related Art As a casing for a blower of this type, a casing 51 for a cylindrical multi-blade fan as shown in FIG.
It has been known. The casing 51 includes a peripheral plate 52 (see FIG. 1) formed by bending a rectangular iron plate into a predetermined shape.
1)), and two side plates 53, 53 that can be attached to the edge of the peripheral plate 52 on the side along the bending direction.

In this conventional casing 51, a peripheral plate 52
A plurality of projecting pieces 54, 54 formed on both edge portions of the plurality of insertion holes 55, 55 formed along the edge portion of the side plate 53.
The peripheral plate 52 and the side plates 53, 53 are assembled by inserting the peripheral plate 52 and the side plates 53, 53 after bending. After assembly, as shown in FIG. 12, the peripheral plate 52 and the side plates 53, 53
In order to prevent the airflow W from leaking from the gap between and, the gap is closed by applying the adhesive S to the gap. Then, after the adhesive S is dried, the cavity portion 56 formed by the peripheral plate 52 and the side plates 53, 53.
Then, an impeller having a plurality of blades is housed therein, and a fan motor (none of which is shown) is attached to the casing 51 to complete the assembly of the cylindrical multi-blade fan.

[0004]

However, the conventional casing 51 has the following problems. That is, the peripheral plate 5
Since it is very difficult to mechanize the adhesive application work to the gaps between the 2 and the side plates 53, 53, it must be done manually, which is an obstacle to cost reduction. Further, when it takes a long time for the adhesive S to dry and the casing 51 is mass-produced, the casing 51 being dried
There is also the problem of having to secure a large space for stocking. Further, since it is difficult to apply the adhesive S evenly, there is a problem that the appearance of the adhesive S is deteriorated due to the flow of the adhesive S.

On the other hand, if the application of the adhesive S is omitted, the peripheral plate 52
As a result of air leakage from the gap between the side plates 53 and 53, the degree of airtightness of the casing 51 is reduced, and as a result, the air pressure of air blown by the impeller is reduced. In this case, in order to secure a high air pressure, it is necessary to compensate for the amount of wind leaking from the gap,
In such a case, it is necessary to use a high-output fan motor, and the size of the device increases, and an extra motor current flows, resulting in an increase in current consumption. In addition, if a fan motor having a similar output is used with increased torque, there is a problem that the life of the fan motor is shortened.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a blower casing capable of reducing the cost while ensuring a high degree of sealing.

[0007]

In order to achieve the above object,
A blower casing according to a first aspect includes a peripheral plate formed by bending a plate member into a predetermined shape, and a side plate attachable to an edge portion of the peripheral plate on a side along the bending direction. , Each of the side plates has a plurality of insertion portions into which the protrusions of the peripheral plate can be inserted, and the protrusions of the peripheral plate are inserted into the side plate. In a fan casing that is inserted into a mouth to assemble a side plate and a peripheral plate, and stores an impeller in a cavity formed by the side plate and the peripheral plate, the side plate is disposed along an edge of the peripheral plate, Further, it is characterized in that it is provided with a seal portion capable of closing the gap between the peripheral plate and the side plate by protruding toward the peripheral plate and coming into contact with either the front surface or the back surface of the peripheral plate.

A blower casing according to a second aspect comprises a peripheral plate formed by bending a plate member into a predetermined shape, and a side plate attachable to an edge portion of the peripheral plate along the bending direction. The peripheral plate has a plurality of protrusions that respectively protrude outward from the edge portion, and the side plate has a plurality of insertion openings into which the respective protrusions of the peripheral plate can be inserted, respectively. In the casing for the blower in which the side plate and the peripheral plate are assembled by inserting the side plate and the peripheral plate into the cavity formed by the side plate and the peripheral plate, the side plate is arranged along the edge of the peripheral plate. It is characterized in that it is provided with a seal portion which is provided and protrudes toward the peripheral plate and comes into contact with the front surface and the back surface of the peripheral plate so as to close the gap between the peripheral plate and the side plate.

A blower casing according to a third aspect of the present invention is the blower casing according to the first or second aspect, wherein the seal portion is formed by pressing a side plate.

[0010]

In the blower casing according to the first aspect, the blower casing is assembled by inserting the protruding portions of the peripheral plate into the respective insertion openings of the side plates to assemble the side plate and the peripheral plate. In this case, the seal portion arranged along the edge of the peripheral plate at the edge of the side plate contacts either the front surface or the back surface of the peripheral plate and closes the gap between the peripheral plate and the side plate. . For this reason, the work of applying the adhesive becomes unnecessary, and the cost of the blower casing can be reduced. In addition, the air sent by the impeller housed in the cavity formed by the side plate and the peripheral plate does not leak from the gap between the peripheral plate and the side plate, and as a result, the reduction of the air pressure to be blown is prevented. To do.

In the blower casing according to claim 2,
In the same manner as the blower casing according to claim 1,
The cost can be reduced, and the seal portion prevents air from leaking from the gap between the peripheral plate and the side plate. In this case, since the seal portion contacts both the front surface and the back surface of the peripheral plate, the air pressure is further prevented from lowering as compared with the blower casing according to the first aspect.

In the blower casing according to claim 3,
Since the punching process of the side plate from the iron plate and the formation of the seal portion can be simultaneously performed by the press process, the mechanization can be performed, and the cost can be further reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A casing according to an embodiment of the present invention will be described in detail below with reference to the drawings.

First, the first embodiment will be described. 1 and 2 are external views of a casing (blower casing) 1 of a cylindrical multi-blade fan that feeds combustion air into a combustion chamber of a water heater. As shown in both figures, casing 1
Includes a peripheral plate 2, two side plates 3a and 3b, and a flange 4. In the casing 1, a DC motor (not shown) is attached to the side plate 3b side, a plurality of blades is provided on the side plate 3a side, and a cylindrical impeller 5 is attached to the motor shaft of the DC motor. Can be attached.
Then, the impeller 5 rotates according to the rotation of the DC motor,
Due to the rotational force, air is sucked from the air supply port 6 provided at the center of the impeller 5, and the sucked air is discharged from the air discharge port 7 formed at the center of the flange 4.

As shown in FIGS. 3 and 4, the peripheral plate 2 is formed into a predetermined shape by bending a rectangular iron plate. Further, the peripheral plate 2 has a plurality of projecting pieces (projecting sections) that respectively project outward from both edges on the side along the bending direction.
It has 11, 11, ... In addition, the tip 1 of the peripheral plate 2
2 constitutes a side wall of the air outlet 7 of the flange 4.

As shown in FIG. 5, the side plate 3a is formed in a ring shape, and a rectangular shape into which the projecting pieces 11, 11, ... Of the peripheral plate 2 can be inserted into the edges of the side plate 3a. A plurality of insertion ports 14 are formed. .. are arranged so that the projecting pieces 11 of the peripheral plate 2 can be inserted when the side plate 2 and the peripheral plate 3a are assembled, and the inserted projecting pieces 11, 11 ... Is formed in such a size that it comes into contact with the outer peripheral portion of the insertion port 14. .., which are arranged along the edge of the peripheral plate 2 and project toward the peripheral plate 2 at the inner side of the insertion openings 11, 11 ... on the rear surface (the rear side in the figure) of the side plate 3a. A rail-shaped seal portion 15 that contacts the back surface side of 2 is formed (see FIG. 6). The seal portion 15 is formed by pressing from the front surface side of the side plate 3a with a pressing machine when punching the side plate 3 from the iron plate. Therefore, a groove 16 is formed on the surface of the side plate 3a on the back side of the seal portion 15 when pressed by press working (FIG. 1, FIG.
5).

Further, a hole 20 is provided at the center of the side plate 3a.
Is formed, and the peripheral plate 2 and the side plate 3 are formed through the holes 20.
Cavity 17 formed by a and 3b (see FIG. 6)
Then, the impeller 5 is stored. After the impeller 5 is housed, a ring-shaped cover (not shown) is attached to cover the impeller 5, so that only the air supply port 6 is exposed to the outside on the side plate 3a side. Further, the laterally projecting portion 18 of the side plate 3 a constitutes a side wall of the air discharge port 7 of the flange 4.

As shown in FIGS. 1 and 2, the side plate 3b has a hole 21 formed in the center thereof. The hole 21 is for mounting the DC brushless motor, and the mounting method will be described later. In addition, in the side plate 3b, only the diameter of the hole 21 is smaller than the diameter of the hole 20 of the side plate 3b,
The other components are formed substantially plane-symmetrically with the side plate 3a. Therefore, the two are collectively referred to as the side plate 3 hereinafter, unless it is necessary to distinguish them.

The flange 4 is for attaching the casing 1 to the air supply port of the combustion chamber of a water heater (not shown), and an exhaust hole 22 is formed in the center thereof. The exhaust hole 22 constitutes an outlet of the air outlet 7 of the casing 1 described above.

Next, the assembly of the casing 1 will be described.

First, the peripheral plate 2 and the side plate 3a are assembled by inserting the respective protruding pieces 11, 11, ... At one edge of the peripheral plate 2 into the insertion openings 14, 14 of the side plate 3a. Then, by inserting the protruding pieces 11, 11 ... of the other edge of the peripheral plate 2 into the insertion openings 14, 14 ... of the side plate 3b,
The peripheral plate 2 and the side plates 3a and 3b are assembled.

Next, a pressing machine presses and crushes the upper portion of each protruding piece 11 protruding from each insertion port 14 from the direction opposite to the protruding direction (see FIG. 7) or bends. By this, each protruding piece 11 is deformed, whereby the side plates 3 and 3 are fixed to the peripheral plate 2. This completes the assembly of the casing 1. The positional relationship between the protruding piece 11 of the peripheral plate 2 and the seal portion 15 of the side plate 3 in this state is shown in FIG. As shown in the drawing, the back surface of the peripheral plate 2 (the surface on the right side of the drawing) and the side wall of the seal portion 15 on the rear surface side of the peripheral plate 2 are in contact with each other, and the gap between the peripheral plate 2 and the side plate 3 is made. 23
Is blocked. As a result, air is prevented from leaking from the gap 23. A pressing machine presses the upper portion of the protruding piece 11 protruding from each of the insertion ports 14 from the opposite direction to the protruding direction, thereby forming a recessed portion on the upper portion of the protruding piece 11 and forming the recessed portion. By the insertion port 14
The peripheral plate 2 and the side plate 3 may be fixed to each other by the protruding piece 11 protruding to the outside of the.

Then, the motor shaft is attached to the side plate 3b on the side plate 3b side.
Install the DC motor so that it projects to the a side. Next, after the impeller 5 is attached to the motor shaft, a cover (not shown) is screwed to the side plate 3a so as to cover the impeller 5. This completes the assembly of the cylindrical multi-blade fan. In this state, the hollow portion 17 of the casing 1 is almost sealed except for the air supply port 6 of the impeller 5 and the air discharge port 7 of the flange 4.

As described above, according to the first embodiment, the projecting pieces 11, 11 ...
The casing 1 is assembled by inserting into the casings 14 ... In this case, the seal portion 15 arranged at the edge of the side plate 3 contacts the back surface of the peripheral plate 2 and closes the gap 23 between the peripheral plate 2 and the side plate 3. Therefore, the air sent by the impeller 5 housed in the cavity 17 formed by the side plate 2 and the peripheral plate 3 does not leak from the gap 23, and as a result, the reduction of the air pressure for blowing is prevented. You can

A DC motor of 40V DC specification was attached to the casing 1 in the first embodiment, and the air pressure of the air discharged from the air discharge port 7 of the flange 4 was measured. As a result, an experimental value of 143 mmH ₂ O was obtained. . On the other hand, when the air pressure of the conventional casing was measured under the same measurement conditions, it was found that in the casing 51 coated with the adhesive S, 147 m
The experimental value of mH ₂ O was 137 mmH ₂ O in the casing to which the adhesive S was not applied. According to this result, in the casing 1 according to the first embodiment, the adhesive S
It can be seen that it has almost the same airtightness as the completely sealed casing 51 coated with. Further, the current consumption of the DC motor is also a value that is almost inversely proportional to the air pressure.

Next, the casing 31 according to the second embodiment will be described with reference to FIG. The same components as those of the casing 1 of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The casing 31 of the second embodiment differs from the casing 1 of the first embodiment in that the seal portion 33 formed on the side plate 32 is in contact with the surface of the peripheral plate 2 as shown in FIG. That is the point. According to the second embodiment, similarly to the first embodiment, it is possible to prevent a decrease in the air pressure of the air blown by the impeller 5. In this case, when the air pressure of the blown air was measured under the same measurement conditions as the casing 1 of the first embodiment, the same 143 mmH as that of the casing 1 of the second embodiment was obtained.
An experimental value of ₂ O was obtained. From this result, it is understood that the casing 31 of the second embodiment has the same hermeticity as the casing 1 of the first embodiment.

Next, the casing 34 according to the third embodiment will be described with reference to FIG. Also in the third embodiment, the same components as those of the casing 1 of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The casing 33 of the third embodiment differs from the casing 1 of the first embodiment in that the seal portion 36 formed on the side plate 35 is in contact with both the back surface and the front surface of the peripheral plate 2. It is a point.

According to the third embodiment, similarly to the casing 1 of the first embodiment, the seal portion 36 prevents the air from leaking from the gap 23 between the peripheral plate 2 and the side plate 35. In this case, as shown in the figure, since the seal portion 36 contacts both the front surface and the back surface of the peripheral plate 2, compared to the casings 1 and 31 of the first and second embodiments, respectively, more air Stop leaks. In this case, the casing 1 of the first embodiment
When the air pressure of the blast was measured under the same measurement conditions as
An experimental value of 5 mmH ₂ O was obtained, and it can be seen that it has almost the same performance as the completely sealed casing 51. Further, in the cylindrical multi-blade fan using the casing 34,
The current consumption was almost the same as that of the cylindrical multi-blade fan using the completely closed casing 51.

In the present embodiment, the casings 1, 31, 34 for the cylindrical type multi-blade fan have been described, but the present invention is not limited to this, and for example, all blowers such as a square type cross flow fan. It can be applied to a casing for.

In this embodiment, the projecting piece 11 is attached to the peripheral plate 2.
While forming the insertion port 15 on the side plates 3, 32, 35, the insertion port 15 is formed on the peripheral plate 2 and the protruding piece 1 is formed on the side plate 3.
1 can also be formed. However, in this case, the bending process of the peripheral plate 2 and the mounting of the peripheral plate 2 on the side plate 3 need to be performed at the same time, which complicates the manufacturing process.

[0033]

As described above, according to the blower casing of the present invention, the seal portion arranged at the edge of the side plate is
By contacting either or both of the front surface and the back surface of the peripheral plate and closing the gap 23 between the peripheral plate and the side plate, there is no need for adhesive application work, and the cost of the blower casing is reduced. You can Further, the air sent by the impeller housed in the cavity formed by the side plate and the peripheral plate does not leak from the gap 23 between the peripheral plate and the side plate, and as a result, the air pressure to be blown is reduced. Can be prevented.

Further, as a result of preventing a decrease in air pressure, the motor incorporated in the blower casing can be downsized, and as a result, the device can be downsized and the current consumption of the motor can be reduced. You can Further, the life of the motor can be extended as compared with the case where the motor having the same output is used with increased torque.

Further, since the punching of the side plate from the iron plate and the formation of the seal portion can be simultaneously performed by the press working, it is possible to mechanize, so that the cost of the blower casing can be further reduced.

[Brief description of drawings]

FIG. 1 is a side view of a casing according to an embodiment.

FIG. 2 is a front view of a casing according to the present embodiment.

FIG. 3 is a front view of a peripheral plate of a casing according to the present embodiment.

FIG. 4 is a plan view of a peripheral plate of a casing according to the present embodiment.

FIG. 5 is a plan view of a side plate of the casing according to the present embodiment.

FIG. 6 is a partially enlarged view of a vertical cross section of the casing according to the first embodiment as viewed from the flange side.

FIG. 7 is a partially enlarged view of the front view of the casing according to the first embodiment.

FIG. 8 is a partially enlarged view of a vertical cross section of the casing according to the second embodiment as viewed from the flange side.

FIG. 9 is a partially enlarged view of a vertical cross section of the casing according to the third embodiment as viewed from the flange side.

FIG. 10 is a plan view of a conventional casing.

FIG. 11 is a front view of a peripheral plate of a conventional casing.

FIG. 12 is a partially enlarged view of a vertical section of a conventional casing as viewed from the flange side.

[Explanation of symbols]

 1 casing 2 peripheral plates 3a, 3b, 32, 35 side plate 5 impeller 11 protruding piece 14 insertion port 15, 33, 36 seal part 17 cavity part 23 gap

Claims (3)

[Claims] 1. A peripheral plate formed by bending a plate member into a predetermined shape, and a side plate attachable to an edge portion of the peripheral plate on a side along the bending direction. The side plate has a plurality of insertion ports into which the respective protrusions of the peripheral plate can be respectively inserted, and the protrusions of the peripheral plate are Assemble the side plate and the peripheral plate by inserting into the insertion opening of the side plate,
In a blower casing that stores an impeller in a cavity formed by the side plate and the peripheral plate, the side plate is disposed along an edge of the peripheral plate, and protrudes toward the peripheral plate. A blower casing, comprising a seal portion capable of closing a gap between the peripheral plate and the side plate by contacting either one of a front surface and a rear surface of the peripheral plate. 2. A peripheral plate formed by bending a plate-like member into a predetermined shape, and a side plate attachable to an edge portion of the peripheral plate on a side along the bending direction, the peripheral plate comprising: The side plate has a plurality of insertion ports into which the respective protrusions of the peripheral plate can be respectively inserted, and the protrusions of the peripheral plate are Assemble the side plate and the peripheral plate by inserting into the insertion opening of the side plate,
In a blower casing that stores an impeller in a cavity formed by the side plate and the peripheral plate, the side plate is disposed along an edge of the peripheral plate, and protrudes toward the peripheral plate. A casing for a blower, comprising a seal portion capable of closing a gap between the peripheral plate and the side plate by contacting a front surface and a back surface of the peripheral plate. 3. The blower casing according to claim 1, wherein the seal portion is formed by pressing the side plate.