JPH11324990A - Air blowing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air blowing device facilitating the working and assembling with reduced noise and having the excellent flow performance. SOLUTION: In this air blowing device, a centrifugal air blower is assembled in a main body box body 1, which has a suction port 2 and a blow-out port 3 in two surfaces thereof opposite to each other and of which inside is formed hollow, so that a discharge port 9 is faced to the blow-out port 3, and an air flow directed from the suction port 2 to the blow-out port 3 is formed. In this case, a muffler material 11 is installed in a wall surface 10 facing to a suction port 2 side of a blower casing 6 for housing impellers 7 of the blower, and an end surface 12 of the muffler material 11 is set at a position close to a straight line for connecting a corner part 14 formed by the wall surface 10 facing to the suction port 2 side of the blower casing 6 and a wall surface 13, in which a suction opening part 15 of the blower casing 6 is opened, and an edge 15 of the suction port 2 at the corner 14 side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower in which a centrifugal blower is incorporated in a main body box.

[0002]

2. Description of the Related Art A blower of this type is used for ventilation and air conditioning of a building or a store. Conventionally, for example, the structure shown in Japanese Utility Model Publication No. 6-48159 is adopted. Have been. That is, a suction port that can be connected to the duct and an air outlet are provided on opposing side surfaces of the main body box configured as a hexahedral box, and the main body is provided in a direction orthogonal to the center line of the suction port. A blower casing having an open suction opening is provided. A centrifugal impeller rotated by a motor is housed in the blower casing. Inside the suction port of the main body box, a guide vane is provided obliquely rising toward the suction opening of the blower casing.

[0003] In this blower, the air flow smoothly flows from the suction port to the suction opening of the blower by the guide vanes, thereby improving the blowing performance and reducing the noise caused by the rotation of the impeller. Therefore, it is easy to vibrate and not very effective. Therefore, as shown in FIG. 13, the surface of the blower casing 30 having the suction opening 31 and the guide part 32 are integrally formed, and the end of the guide part 32 is attached to the mating part of the main body box 33 on the side of the suction port 34. What has been developed. In this blower, the guide portion 32
In addition, a guide plate 35 that obliquely surrounds another corner in the main body box 33 and a guide plate 36 that guides an air flow to the suction opening 31 are provided. A series of wind paths are formed between the two. The noise caused by the rotation of the impeller 37 is attenuated by the back air layer in the space surrounded by the guide portion 32, the blower casing 30, and the main body box 33, and the blowing (air volume) performance is also improved by the configuration of the air path. You.

[0004]

In the above-described conventional blower, the suction opening 31 with the guide portion 32 is provided.
However, there is a problem in that the processing of the parts constituting is complicated because it has a curved surface shape and a slope configuration, and the assembly also requires spot welding or the like, which is troublesome.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. An object of the present invention is to develop a blower having a low noise level and a good air volume performance which is easy to process and assemble. Another object of the present invention is to develop a blower having good air volume performance that is easy to process and assemble, and to promote reduction of the cost of the blower.

[0006]

According to a first aspect of the present invention, a discharge port is provided in a main body box having a hollow inside having a suction port and an air outlet on two opposing surfaces. A blower that incorporates a centrifugal blower facing the blower outlet to form an airflow from the suction opening toward the blower outlet, on the wall facing the suction opening side of the blower casing containing the impeller of the blower Along with mounting the silencer, the end face of the silencer is formed by a wall formed by a wall facing the suction opening of the blower casing and a wall formed by opening the suction opening of the blower casing, and a mouth of the suction opening on the corner. Means for setting a position close to a straight line connecting the edge and the edge is adopted.

In order to achieve the above object, a second aspect of the present invention is to dispose a discharge port facing a blow port in a main body having a hollow inside having a suction port and a blow port on two opposing surfaces. For a blower that incorporates a centrifugal blower and forms an airflow from the suction port to the blowout port, while installing a sound deadening material on the wall facing the suction port side of the blower casing containing the impeller of the blower , The end face of this silencer,
Following the straight line connecting the corner formed by the wall face facing the suction port side of the blower casing and the wall face where the suction opening of the blower casing is opened, and the edge of the lip of the suction port on the corner side. A means of forming by adoption is adopted.

In order to achieve the above object, a third aspect of the present invention is to dispose a discharge port facing a blow port in a main body having a hollow inside having a suction port and a blow port on two opposite surfaces. For a blower that incorporates a centrifugal blower and forms an airflow from the suction port to the blowout port, while installing a silencer on the wall facing the suction port side of the blower casing containing the impeller of the blower , The end face of this silencer,
A circle is formed at a position close to a straight line connecting a corner formed by a wall surface facing the suction port side of the blower casing and a wall surface where the suction opening of the blower casing is opened, and an edge of a rim of the suction port on the corner portion side. A means for chamfering in an arc shape is adopted.

In order to achieve the above object, the invention according to claim 4 provides an end face of the sound deadening material in the means according to claim 1,
At a position that does not protrude from a straight line that connects the corner formed by the wall surface facing the suction port side of the blower casing and the wall surface where the suction opening of the blower casing is opened, and the edge of the rim of the suction port on the corner side. Employ means for setting.

[0010] In order to achieve the above object, a fifth aspect of the present invention relates to the means of the first aspect,
A position slightly protruding from a straight line connecting a corner formed by a wall surface facing the suction port side of the blower casing and a wall surface where the suction opening of the blower casing is opened, and an end edge of a rim of the suction port on the corner portion side. Is adopted.

In order to achieve the above object, the invention according to claim 6 employs a means having a laminated structure in which the sound deadening material in the means according to claim 1 is overlapped on the suction port side of the main body box.

According to a seventh aspect of the present invention, in order to achieve the above-mentioned object, the above-mentioned means according to the first aspect, wherein the suction opening is located near the center line of the suction opening, the end of the sound-absorbing material is provided. Means is adopted in which the ratio of the length to the length of the side wall on the suction port side of the blower casing protruding into the main body box is 0.75 to 0.9.

In order to achieve the above object, an invention according to an eighth aspect of the present invention is directed to a main body box body having a suction port and a discharge port on two opposing surfaces, the inside of which is formed as a cavity, with the discharge port facing the discharge port. For a blower that incorporates a centrifugal blower to form an airflow from the suction port to the outlet, the wall surface facing the suction port side of the blower casing containing the impeller of the blower and the suction opening of the blower casing Faces the inlet side of the blower casing, with a protruding structure in which the end is located in a position close to a straight line connecting the corner formed by the wall surface with the opening and the edge of the mouth of the inlet on the corner side Means provided for the wall surface is adopted.

According to a ninth aspect of the present invention, a discharge port faces a blow port in a main body having a hollow inside having a suction port and a blow port on two opposite surfaces. For a blower that incorporates a centrifugal blower and forms an airflow from the suction port to the blowout port, the wall face facing the suction port side of the blower casing containing the impeller of the blower and the wall face and the blower casing Means for integrally forming a protruding structure in which an end is located in a position close to a straight line connecting a corner formed by a wall surface where the suction opening is opened and an edge of a rim of the suction port on the corner side. Is adopted.

[0015]

Embodiments of the present invention will now be described with reference to the drawings. Embodiment 1 FIG. The first embodiment shown in FIGS. 1 to 4 relates to a blower used for ventilation and air conditioning of a building or a store. As shown in FIG. 1, the blower includes a main body box 1 configured as a hexahedral box having a hollow interior. At a substantially center of the opposing side surface of the main body box 1, a rectangular suction port 2 and a blow port 3 which can be connected to a duct are provided, respectively, and the whole is suspended and fixed by anchor bolts or the like (not shown). Are mounted two by two. As shown in FIG. 2, a centrifugal blower having a box-shaped blower casing 6 having a suction opening 5 opened in a direction orthogonal to the center line of the suction opening 2 is provided in the main body box 1. It is built in the side. The blower casing 6 is made of sheet metal, and its suction opening 5 is formed in a bell mouth shape and opens downward near the center line of the suction port 2. A scroll (not shown) is mounted in the blower casing 6, and an impeller 7 having a suction portion corresponding to the suction opening 5 is incorporated. The impeller 7 is mounted on a rotating shaft of a motor 8, and rotates to form an airflow from the suction opening 5 to the discharge port 9 facing the blowout port 3.

On the wall surface 10 facing the suction port 2 side of the blower casing 6, a silencer 11 having a thickness of about 50 mm for reducing noise caused by rotation of the impeller 7 is inserted into a pin or attached with an adhesive. ing. The sound deadening material 11 is made of a porous material such as glass wool, and can be easily cut into a desired size and mounted. End face 1 of this silencer 11
2 is located at a position retracted from the wall surface 10 of the blower casing 6 as shown in FIGS. That is, a corner portion 14 formed by a wall surface 10 facing the suction port 2 side of the blower casing 6 and a wall surface 13 where the suction opening 5 of the blower casing 6 is opened,
The end surface 12 of the noise reduction material 11 is set at a position close to a straight line R connecting the edge 15 of the edge of the suction port 2 on the corner portion 14 side, the length La to the end surface 12 of the noise reduction material 11, and the blower The ratio La / Lk of the protruding length Lk of the wall surface 10 on the suction port 2 side of the casing 6 into the main body box 1 is set to be 0.75 to 0.9. The silencer 11 is also mounted on the inner wall of the air passage 16 extending from the suction port 2 to the suction opening 5.

When the blower of the blower is operated, an air flow is formed from the suction port 2 of the main body box 1 to the blowout port 3. The airflow from the suction port 2 to the suction opening 5 is
Flows into the suction opening 5 by taking the shortest path. Therefore, the space portion of the main body box 1 on the side of the blower casing 6 from the straight line R is a portion that does not contribute to the flow of air, and even if a member such as an air guide is provided in this portion, it hardly contributes to the blowing performance. In the blower according to the present embodiment, the air sucked from the edge of the blower casing 6 at the corner 14 side of the suction port 2 flows along a straight line R as shown in FIG. The corner 17 of the blower casing 6 is grazed and the corner 14 is sucked into the suction opening 5. A small vortex is formed on the end face 12 when
When the corner 14 of the metal blower casing 6 is grazed, a small vortex is formed.
Since the angle of the straight line R is smaller than the straight line connecting the edge of the suction port 2 and the corner portion 17 of the sound deadening material 11 in a case where the air inlet is fully filled, the vortex is not increased and the air volume performance is improved.

Further, the noise caused by the rotation of the impeller 7 can be reduced to a level which is almost the same as the case where the silencer 11 is provided on the entire surface of the wall surface 10. FIG. 4 is a characteristic curve of the air blower according to the present embodiment. The vertical axis indicates La / Lk, and the horizontal axis indicates the air flow rate Qa of the blower as a ratio of the rated air flow Qn.
Qn is taken. As can be seen from FIG. 4, when La / Lk is about 0.83, Qa / Qn becomes the largest. That is,
This blower can reduce noise and improve air volume performance without any troublesome members such as an air guide for processing and assembly, and can promote cost reduction.

Embodiment 2 The second embodiment shown in FIGS. 5 to 9 relates to a blower similar to the blower shown in the first embodiment, and is the same as that of the first embodiment except for the structure of the silencer. Therefore, the same parts as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof will be omitted.

In the blower of this embodiment shown in FIG. 5, the end face 12 of the silencer 11 is slightly retracted from the straight line R. When the wind speed is low, the flow of the air is not necessarily linear, but since the end face 12 of the silencer 11 is receded from the straight line R, even if there is air wraparound, this can be dealt with. Other configurations and functions are the same as those of the first embodiment.

Another air blower of the present embodiment shown in FIG. 6 is one in which the corners 17 of the end face 12 of the silencer 11 are aligned with a straight line R. In this case as well, functions similar to those of the first embodiment can be performed.

7 and 8 show another embodiment of the blower according to the present invention, in which the end face 12 of the silencer 11 is cut obliquely along a straight line R or cut in an arc shape to form a chamfer 1.
It has a configuration of eight. As a result, a small vortex at the corner 17 of the sound deadening material 11 is not formed, and the improvement of the air volume performance can be promoted. Other configurations and functions are the same as those of the first embodiment.

Further, still another blower of the present embodiment shown in FIG. 9 has a laminated structure in which a silencing material 11 is superimposed on the suction port 2 side of the main body box 1, and each end face of the laminated silencing material 11 12 is set at a position close to the straight line R. With this configuration, the thickness of the silencing material 11 can be increased to enhance the silencing effect, and the generated vortex becomes a small two-stage vortex, thereby improving the air volume performance. Other configurations and functions are the same as those of the first embodiment.

Embodiment 3 FIG. The third embodiment shown in FIGS. 10 to 12 relates to a blower similar to the blower shown in the first embodiment, and the basic configuration is the same as that of the first embodiment. Therefore, the same parts as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof will be omitted.

The blower according to the third embodiment is shown in FIG.
As shown in FIG. 11, a member having a shape corresponding to the outer shell of the sound deadening material 11 as shown in the first and second embodiments is fixed to the wall surface 10 of the blower casing 6 to form the projecting structure 19, or The projection structure 19 is integrally formed. As described in the first and second embodiments, the noise reduction function is provided by the noise reduction material 11, but the improvement in the air volume performance is due to the shape of the blower casing 6 on the wall surface 10 side. Therefore, when the shape of the wall surface 10 of the blower casing 6 is configured by members other than the sound deadening material 11 as in the first and second embodiments, the sound deadening function can be omitted, but the air volume performance can be improved. In the configuration in which the protruding structure 19 is configured by attaching another member, an air layer 20 is formed inside, and the noise of the impeller 7 can be reduced. On the other hand, the structure in which the projecting structure 19 is integrally formed is effective when the blower casing 6 is formed of a plastic molded product, and can contribute to weight reduction and cost reduction. Other configurations and functions are the same as those of the first and second embodiments.

In each of the above embodiments, the shape of the suction port 2 of the main body box 1 may be round as shown in FIG. 12, but the suction port 2 in the case of the round suction port 2 is used. The edge 15 of the rim may be in the range of about 90 degrees of the rim as shown in FIG. 12, and the shape of the end surface 12 of the sound deadening material 11 or the protruding structure 19 is also in an arc shape as shown in FIG. Become.

[0027]

As is clear from the above description of the embodiment, according to the first aspect of the present invention, it is possible to obtain a blower having a low noise level and a good air volume performance which is easy to process and assemble.

According to the second aspect of the present invention, processing and processing can be performed with low noise.
A blower with good air volume performance that is easy to assemble can be obtained.

According to the third aspect of the present invention, processing and processing can be performed with low noise.
A blower with good air volume performance that is easy to assemble can be obtained.

According to the fourth aspect of the invention, processing and processing can be performed with low noise.
A blower with good air volume performance that is easy to assemble can be obtained.

According to the fifth aspect of the present invention, processing and processing can be performed with low noise.
A blower with good air volume performance that is easy to assemble can be obtained.

According to the sixth aspect of the present invention, it is possible to further improve the muffling effect together with the effect according to the first aspect.

According to the seventh aspect of the present invention, processing and processing can be performed with low noise.
A blower with good air volume performance that is easy to assemble can be obtained.

According to the eighth aspect of the present invention, it is possible to obtain a blower having good air volume performance, which is easy to process and assemble.

According to the ninth aspect of the present invention, it is possible to obtain a blower having a good air volume performance which can be easily processed and assembled.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a blower according to a first embodiment.

FIG. 2 is a cross-sectional view illustrating the blower of the first embodiment.

FIG. 3 is an explanatory diagram showing a function of a sound deadening material of the blower of the first embodiment.

FIG. 4 is an explanatory diagram illustrating a characteristic curve of the blower of the first embodiment.

FIG. 5 is an explanatory diagram showing a form of a sound deadening material of a blower according to a second embodiment.

FIG. 6 is an explanatory diagram showing a form of a sound deadening material of a blower according to a second embodiment.

FIG. 7 is an explanatory view showing a form of a sound deadening material of a blower according to a second embodiment.

FIG. 8 is an explanatory diagram showing a form of a sound deadening material of a blower according to a second embodiment.

FIG. 9 is an explanatory view showing a form of a sound deadening material of a blower according to a second embodiment.

FIG. 10 is a sectional view of a main part of a blower of a third embodiment.

FIG. 11 is a sectional view of a main part of a blower of a third embodiment.

FIG. 12 is a side view showing another form of the blower of the third embodiment.

FIG. 13 is a sectional view showing a conventional blower.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Main body box, 2 Inlet, 3 Outlet, 5 Suction opening, 6 Blower casing, 7 Impeller,
9 discharge port, 10 wall surface, 11 sound deadening material, 12 end surface, 13 wall surface, 14 corner, 15 edge, 1
8 chamfers, 19 protruding structures, 20 air layers.

Claims (9)

[Claims] 1. A centrifugal blower with a discharge port facing the air outlet and a centrifugal blower incorporated in a main body having a hollow interior with a suction port and an air outlet on two opposing surfaces. A blower configured to form an airflow toward the outlet, wherein a sound deadening material is mounted on a wall facing the suction port side of a blower casing containing an impeller of the blower, and an end face of the sound deadening material. A straight line connecting a corner formed by a wall surface facing the suction port side of the blower casing and a wall surface where the suction opening of the blower casing is opened, and an edge of an edge of the suction port on the corner portion side. Blower set at a position close to. 2. A centrifugal blower with a discharge port facing the air outlet and a centrifugal blower incorporated in a main body box having a hollow inside with a suction port and an air outlet on two opposing surfaces. A blower configured to form an airflow toward the outlet, wherein a sound deadening material is mounted on a wall facing the suction port side of a blower casing containing an impeller of the blower, and an end face of the sound deadening material. A straight line connecting a corner formed by a wall surface facing the suction port side of the blower casing and a wall surface where the suction opening of the blower casing is opened, and an edge of an edge of the suction port on the corner portion side. An air blower formed along the straight line above. 3. A centrifugal blower with a discharge port facing the air outlet and a centrifugal blower incorporated in a main body having a hollow interior with a suction port and an air outlet on two opposing surfaces. A blower configured to form an airflow toward the outlet, wherein a sound deadening material is mounted on a wall facing the suction port side of a blower casing containing an impeller of the blower, and an end face of the sound deadening material. A straight line connecting a corner formed by a wall surface facing the suction port side of the blower casing and a wall surface where the suction opening of the blower casing is opened, and an edge of an edge of the suction port on the corner portion side. Blower that is chamfered in an arc shape at a position close to. 4. The blower according to claim 1, wherein the end surface of the sound deadening material is formed by a wall surface facing the suction port side of the blower casing and a corner formed by a wall surface where the suction opening of the blower casing is opened. An air blower set at a position not protruding from a straight line connecting the edge of the edge of the suction port on the corner side. 5. The blower according to claim 1, wherein the end surface of the silencing material is formed by a wall surface facing the suction port side of the blower casing and a wall surface formed by the suction opening of the blower casing. An air blower set at a position slightly protruding from a straight line connecting the edge of the edge of the suction port on the corner side. 6. The blower according to claim 1, wherein the muffler has a laminated structure in which the sound deadening material is superimposed on the suction port side of the main body box. 7. The air blower according to claim 1, wherein a length of the air blower located near the center line of the air inlet is up to an end surface of the silencer, and the air inlet of the air blower casing. The ratio between the length of the side wall on the side and the length of the side wall protruding into the body box is set to 0.
Blower with 75 to 0.9. 8. A centrifugal blower with a discharge port facing the air outlet and a built-in centrifugal blower inside a main body box having a hollow inside with a suction port and an air outlet on two opposing surfaces. A blower configured to form an airflow toward the outlet, wherein a wall surface facing the suction port side of a blower casing containing an impeller of the blower and a wall surface at which a suction opening of the blower casing is opened. The protruding structure in which the end is located at a position close to a straight line connecting the corner formed by and the edge of the rim of the suction port on the corner side, on the wall face facing the suction port side of the blower casing. Blower provided for 9. A centrifugal blower having a discharge port facing the air outlet and a centrifugal blower incorporated in a main body box having a hollow inside having a suction port and an air outlet on two opposing surfaces. A blower configured to form an airflow toward the outlet, wherein a wall facing the suction port side of a blower casing containing an impeller of the blower has the wall and the suction opening of the blower casing. A blower in which a protruding structure in which an end is located at a position close to a straight line connecting a corner formed by an open wall surface and an edge of a rim of the suction port on the corner side is integrally formed.