JP2005331212A - Plug fan chamber for air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plug fan for an air conditioner, allowing acquisition of a constant-direction airflow with a compact fan chamber, and allowing improvement of blowing efficiency. <P>SOLUTION: In this plug fan chamber having a rectangular parallelepiped shape and incorporating the plug fan for the air conditioner, the front face of the rectangular parallelepiped is provided with a fixed opening part from which circular air flows in, and the outside part of the rear face opposite to the front face is installed with a fan drive motor. In the plug fan chamber, a wall face of the rectangular parallelepiped is provided with a heat insulation material, a blowing port of the plug fan is positioned inside a side face orthogonal to the opposite front and rear faces, an opposite position of the blowing port is provided with an air blowing guide member having a U-shaped bottom part, air blown off from a side peripheral face of the plug fan is guided, and a rotation center of the plug fan is displaced from the center of the U-shaped air blowing guide member and is decentered. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention belongs to the technical field of a blower of an air conditioner, and in particular, a plug fan chamber in which a plurality of wings extending outward from the center of rotation are arranged on two rotating disks and blown using centrifugal force.

Conventionally, a blower for an air conditioner has been known to have a plug fan in which a plurality of wings extending from the center of rotation to the outside are arranged on two rotating disks and air is blown using the wings and the centrifugal force of air. Since the fan output is large and the noise is low, it is installed in many air conditioners such as clean rooms (for example, Patent Document 1). The opposite is that the outer peripheral side is widely open.
By the way, these air conditioner plug fans discharge air around the outer circumference circle, but a large chamber is provided on the outer circumference to cover it, and the direction is further changed to supply air to the duct and the room. It was.
Therefore, the present applicant can obtain a certain amount of airflow in a compact fan room and a necessary amount of airflow with a damper in the compact fan room without providing a large chamber in the plug fan of the air conditioner. A U-shaped damper air volume guide device is proposed (Patent Document 2).
The structure of the fan chamber of the prior art by the present applicant is as shown in FIG. 10, and this plug fan chamber is formed of a rectangular parallelepiped having a heat insulating material on the wall surface, and a circular air is provided in front of the rectangular parallelepiped. Is provided with a bell mouth-like fixed opening f, and immediately after that, the plug fan (g) is directly connected to the drive motor, and the plug fan rotates.
Inside the right side surface a and the left side surface b of the rectangular parallelepiped, a damper d having a U-shaped bottom d1 is provided at a position opposite to the air blowing port (g), and both ends of the U-shaped damper d are connected to the right side a and the left side. The air fixed to the upper wall surface of the surface b by the fixing means e1 and e2 and discharged by the plug fan g is guided to the upper duct or the like along the U-shaped damper d.
Japanese Patent Laid-Open No. 9-137979 Japanese Patent Application No. 2003-432445

By the way, as described above, it is possible to obtain airflow in a certain direction in a compact fan room without providing a large chamber, and to obtain the necessary airflow with a damper in the compact fan room. In the plug fan chamber of the air conditioner provided with the members, it has been found that there is still room for improving the blowing efficiency because the wind direction is disturbed.
The present invention has been made in view of the above points. In a plug fan chamber of an air conditioner provided with an air flow guide member of a U-shaped damper, an air conditioner that reduces airflow disturbance and improves air blowing efficiency with a simple configuration. It is to provide a plug fan room for the machine.

  In order to solve the above-mentioned problems, according to the invention of claim 1, the plug fan chamber has a rectangular parallelepiped shape, and a fixed opening through which circular air flows is provided on the front surface of the rectangular parallelepiped, and a rear surface facing the front surface is provided. In a fan chamber containing a plug fan with a fan drive motor installed outside, a heat insulating material is provided on the wall surface of the rectangular parallelepiped, and a blower port of the plug fan is located inside a side surface orthogonal to the opposed front and rear surfaces. In addition, a U-shaped air guide member having a U-shaped bottom is provided at a position opposite to the air outlet, guides the air blown from the side peripheral surface of the plug fan, and the rotation center of the plug fan has a U-shape. It is a plug fan chamber of an air conditioner characterized by being deviated from the center of the air blowing guide member.

  According to a second aspect of the present invention, in the first aspect, the U-shaped damper is made of a flexible plate-shaped member, and both ends of the U-shaped damper are moved by the opening adjusting means on the upper surface of the rectangular parallelepiped of the plug fan chamber. The plate-like member is suspended in a U-shape so as to be opposed to more than half a circumference of the blower opening of the plug fan, and is formed at both ends of the plate-like member by the opening adjusting means. The plug fan chamber of an air conditioner according to claim 1, further comprising an air volume adjusting means whose area is variable by the moving member.

Since the present invention is configured as described above, even in a plug fan of an air conditioner, an air flow in a certain direction can be obtained in a compact fan room and a damper in the fan room is necessary without providing a large chamber. In addition, the rectangular parallelepiped wall used as the fan chamber is made of heat insulating material and soundproofing material, so it is not necessary to be inside the frame with heat insulating material. It may be exposed, and the effect of facilitating the installation of the plug fan is obtained.
In addition, a simple configuration in which a U-shaped damper is used as the air blowing guide member and the position of the fan in the fan chamber is decentered, so that the air flow is further rectified and the air blowing efficiency can be improved. .

  The present invention is characterized in that a compact rectangular parallelepiped fan chamber is provided for a plug fan of an air conditioner, a ventilation guide member is provided adjacent to the plug fan in the fan chamber, and the fan chamber is covered with a heat insulating material. Furthermore, the air blowing guide member is used as a U-shaped damper to improve the air blowing efficiency, and the assembly is simple and compact.

Hereinafter, a preferred first embodiment in which the present invention is used for a plug fan (blower) will be described with reference to the drawings.
FIG. 1 is a cross-sectional view from the side of a rectangular parallelepiped 2 in which a heat insulating material is provided on the wall surface of the plug fan chamber 1 of the first embodiment, and a bell mouth-like fixing in which circular air flows into the front surface 21 of the rectangular parallelepiped 2. An opening 3 is provided, and a fan fan 1 is provided with a plug fan 4 directly connected to a drive motor 5. The drive motor 5 is attached to a strong drive motor mounting base 51 outside the opposed rear face 22 of the front face 21. It is attached.
As shown in FIGS. 1 and 2, the fixed opening 3 sucks air from the front of the rectangular parallelepiped 2 and guides it to the cavity 44 at the center of rotation of the plug fan 4, and is fixed to the front surface 21. The plug fan 4 is composed of two upper circular outer frames 41 and a lower circular outer frame 42 that serve as runners, and a plurality of blades 43 are fixed between the two upper and lower circular outer frames 41, 42. A plurality of blades 43 are arranged on the circumference at equal intervals around the central cavity 44 following the fixed opening 3 so as to go outward from the center of rotation. It is discharged from the mouth 45 in the circumferential direction.

An air blowing port 45 of the plug fan 4 is located inside the right side surface 23 and the left side surface 24 orthogonal to the opposed front and rear surfaces 21 and 22 described above, and the air blowing guide member 6 is provided so as to face the air blowing port 45. The member 6 is a damper (air blowing guide member) 6 having a U-shaped bottom 61 at a position opposite to the air blowing port 45, and is made of a flexible plate material, and both ends of the U-shaped damper 6 are located in the fan chamber 1. The cuboid is fixed to the upper wall surfaces of the right side surface 23 and the left side surface 24 by fixing means 71 and 72.
The plate member is made of a flexible material. For example, a plate member such as stainless steel is simply fixed to the upper wall surface of the right side surface 23 and the left side surface 24 of the rectangular parallelepiped 2 and more than half a circumference of the blower opening 45 of the plug fan 4. Are suspended in a symmetrical U-shaped side cross-sectional shape so as to be opposed to each other, and air blowing guide means is formed. With this U-shaped damper 6, the air discharged by the plug fan, especially the air in the lower half area, smoothly flows along the U-shaped damper 6 to the duct (not shown) in the upper part of the plug fan chamber 1. Guided.

The plug fan 4 is fixed to the drive motor mounting base 51. As shown in FIGS. 3 and 4, the drive motor mounting base 51 is shifted from the center, and the center of rotation of the plug fan 4 is also the U-shape. It is in a position where it deviates from the center of the air guide member of the cylindrical damper.
Here, the side to be eccentric with respect to the right side surface 23 and the left side surface 24 of the plug fan chamber 1 has the shape of the blade 43 as shown in FIG. 2, that is, when the bending direction of the blade 43 is clockwise. The plug fan 4 rotates counterclockwise (arrow A) and releases air toward the U-shaped damper 6, but the air amount tends to be large on the right side surface 23 in the rotational direction of the blade 43 itself. Therefore, in the first embodiment, it is preferable that the fan 4 is eccentric to the left as shown in FIG.
The greater the degree of eccentricity, the more the rectifying effect is recognized. However, if the plug fan 4 is too close to the wall of the right side surface 23 and the left side surface 24, the fan blowing function will be hindered, resulting in an increase in blowing efficiency. descend. The approach distance that hinders the blowing action is generally related to the diameter of the runner of the plug fan. In Example 1, when the runner diameter of the plug fan 4 is D, the approach distance that does not hinder the blowing action, that is, Since the performance guarantee condition is 0.75D, the distance from the center of the plug fan 4 to the right side surface 23 is 1.5D, and the distance from the center of the plug fan 4 to the left side surface 24 is also as shown in FIG. The distance between the right side surface 23 and the left side surface 24 of the plug fan chamber 1 was 2.25D.
Furthermore, heat insulating materials having heat insulating and soundproofing functions are provided on the side walls 21, 22, 23, 24 and the bottom surface 25 of the rectangular parallelepiped 2, and a fixed frame body fixed to a chamber or the like is provided on the bottom surface 25 for easy installation. The drive motor 5 is attached to a strong drive motor mounting base 51 outside the side surface 22 to reduce the load on the strength of the rectangular parallelepiped 2.
A comparison experiment result between the case where the position of the plug fan 4 in the first embodiment described above is 1.5D / 0.75D eccentricity ratio and the ratio 1 in the prior art shown in FIG. In addition, both structures are the same except eccentricity.

The graph of FIG. 5 is a diagram showing the relationship between the air volume and the static pressure, and shows the performance characteristics of the fan at a predetermined number of rotations of the fan. It is the experimental result which measured the performance in the case of making eccentricity of Example 1 and the same rotation speed, and the one where the static pressure is large with the same air volume will have better performance.
Therefore, when the graph of FIG. 5 is examined, for example, when the air volume is 10,000 m ³ / h, the static pressure of Example 1 is approximately 250 Pa higher than that of the comparative example, and the example is superior for all the air volumes. I understand. The required load power at this time is represented by the graph of air volume-shaft power in FIG. 6. In the case of the comparative example of the prior art and the case of Example 1, the load power is almost the same, and when the air volume is 10000 m ³ / h, On the contrary, it can be seen that the load power is smaller in Example 1. Therefore, even if the static pressure is high with the same air volume, there is a case where the amount of work does not change if more shaft power is used. However, in the case of Example 1, the static pressure is higher than in the comparative example and The workload is the same or less.
From these facts, the efficiency is calculated by calculating the air volume, the rotation speed, and the shaft power in the graph of FIG. 7, but the air volume is plotted on the horizontal axis and the static pressure efficiency is plotted on the vertical axis. It can be said that the fan is more efficient as the value is higher. However, as can be seen from the graph of FIG. 7, for example, when the air volume is 10,000 m ³ / h, the static pressure efficiency of Example 1 is approximately 15%, It can be seen that the configuration of Example 1 is superior in the static pressure efficiency with the air volume.
Since it is the above configuration, its action is obtained by a compact fan room 1 with a certain amount of airflow and a damper in the fan room 1 without requiring a large chamber as in the conventional air conditioner. In this case, since the plate-like member of the U-shaped damper 6 is housed in the rectangular parallelepiped 2, the air flow does not leak outside even if the damper is not in close contact with the side wall. , All will be blown out from the opening, a U-shaped damper 6 of a plate-like member is provided, and the center of rotation of the plug fan 4 is also deviated from the center of the air guide of the U-shaped damper 6 Since it is in the position which does, it also has the effect | action that the ventilation of a plug fan can be guide | induced more efficiently.
The rectifying action of the first embodiment is guided along the U-shaped damper to the upper duct or the like, but by decentering the position of the plug fan 4 in the plug fan chamber 1, the dotted line and the arrow in FIG. As shown, it is considered that the air flow is more fixed and the rectifying effect is improved.

Moreover, since the plug fan 4 is housed in a rectangular parallelepiped fan chamber and the fan chamber is a rectangular parallelepiped, it is easy to install, and this is further facilitated by providing a base for fixing the fan chamber on a flat bottom surface. The drive motor 5 is attached to a strong drive motor mounting base 51 outside the side surface 22, and the base 51 is fixed to the inside of the chamber or the floor, so that the strength of the rectangular parallelepiped 2 itself only needs to correspond to the plug fan. It can be lightweight.
Furthermore, since the wall surface of the rectangular parallelepiped 2 that becomes the plug fan chamber 1 is provided with a heat insulating material and a soundproof material, it is not necessary to provide a heat insulating material in the chamber itself, and in some cases, the plug fan chamber 1 is exposed to the outside of the chamber. May be.

Next, a second embodiment will be described with reference to FIGS.
In the second embodiment, an opening adjusting means 9 is provided in the U-shaped damper 6 which is the air blowing guide member of the first embodiment, and a movable U-shaped damper 8 capable of adjusting the air flow rate is provided. Other configurations are the same as those in the first embodiment.
The movable U-shaped damper 8 is a flexible plate-like member. As shown in FIGS. 8 and 9, the U-shaped damper 8 has a U or more around a half circumference of the blower opening 45 of the plug fan 4 at a predetermined distance from the blower opening 45. A pair of moving end portions 81 at the upper end of the U-shaped portion move left and right to form an opening X, and air is blown from the opening X at the upper end.
The mounting position of the plug fan 4 is fixed to the drive motor mounting base 51 as in the first embodiment. However, as shown in FIG. 9, the driving motor mounting base 51 is at a position shifted from the center. The center of rotation is also at a position that is offset from the center of the air guide member of the U-shaped damper.
Similarly to Example 1, this eccentricity ratio was set to 1.5D / 0.75D in Example 2.
In addition, a heat insulating material having a heat insulating function and a soundproof function is provided on each of the side surfaces 21, 22, 23, 24 and the bottom surface 25 of the rectangular parallelepiped 2, and a fixed frame body fixed to a chamber or the like is provided on the bottom surface 25 for easy. The drive motor 5 is attached to a strong drive motor mounting base 51 outside the side surface 22 so that the load on the strength of the rectangular parallelepiped 2 can be reduced.

The opening X is provided with opening adjusting means 9 so that the area of the opening X can be adjusted so that the air flow rate can be adjusted. The opening adjusting means 9 spans an adjusting screw rod 91 via bearings 23a and 24a between the right side surface 23 and the left side surface 24 facing each other in the plug fan chamber 1, and the adjusting screw rod 91 is arranged in the direction of the screw from the center. Is provided on the contrary.
A pair of nut portions 92 are provided to be engaged with the adjusting screw rod 91, and the end portion of the plate-shaped member of the movable U-shaped damper 8 is provided on the nut portion 92 as in the first embodiment. Although the portion 81 is provided, similarly to the first embodiment, the nut portion 92 is swingably provided via a hinge that rotates about a rotation axis.
In addition, a handle 93 is provided at one outer end of the right side surface 23 and the left side surface 24 of the adjustment screw rod 91. By rotating the handle 93, the adjustment screw rod 91 rotates, and the adjustment screw rod Since the screw portion 91 is provided in the opposite direction from the center, the engaging nut portion 92 moves in a direction in which the opening narrows or in a direction in which the opening widens, and the opening X also has an opening area corresponding thereto. Can be changed.
Since the second embodiment is simply configured to suspend the plate-like member of the movable U-shaped damper 8 via the moving end portion 81, in addition to the function and effect of the first embodiment, an extremely simple structure is provided. It is inexpensive and easy to assemble and maintain.

Needless to say, the present invention is not limited to the above-described embodiments as long as the features of the present invention are not impaired.
The fan chamber of the plug fan of the air conditioner of the present invention is not limited to an air conditioner and can be applied to the same type of equipment using a blower, for example, a refrigerator.

It is a sectional side view of the plug fan chamber of 1st Example of this invention. It is a disassembled perspective view of the principal part of a 1st Example. FIG. 2 is a right side sectional view taken along line aa in FIG. 1. FIG. 2 is a left sectional view taken along line aa in FIG. 1. It is a figure of the graph showing the relationship of the air volume-static pressure of 1st Example. It is a figure of the graph showing the relationship of the air volume-shaft power of the 1st Example. It is a figure of the graph showing the relationship of the air volume-static pressure efficiency of a 1st Example. It is right side sectional drawing of the plug fan chamber of the 2nd Example of this invention. It is left sectional drawing of the plug fan chamber of the 2nd Example of this invention. It is a sectional side view of a fan uneccentric chamber using a U-shaped damper of the prior art.

Explanation of symbols

1 ... Plug fan room,
2 ... rectangular parallelepiped, 21 ... front, 22 ... rear, 23 ... right side, 24 ... left side, 25 ... bottom,
23a, 24a ... bearings 3 ... fixed opening,
4 ... Plug fan, 41 ... Upper circular outer frame, 42 ... Lower circular outer frame, 43 ... Blade,
44 ... Cavity, 45 ... Blower,
5 ... Drive motor, 51 ... Drive motor mounting base,
6 ... U-shaped damper (air blowing guide member), 61 ... bottom, 71,72 ... fixing means 8 ... movable U-shaped damper, 81 ... moving end,
9 ... Opening adjustment means, 91 ... Adjustment screw rod, 92 ... Nut, 93 ... Handle,

Claims (2)

  The plug fan chamber has a rectangular parallelepiped shape, a fixed opening through which circular air flows is provided on the front surface of the rectangular parallelepiped, and a fan that incorporates a plug fan with a fan drive motor attached to the exterior of the rear surface facing the front surface. In the chamber, a heat insulating material is provided on the wall surface of the rectangular parallelepiped, and a blower port of the plug fan is located inside a side surface orthogonal to the opposed front and rear surfaces, and a bottom portion is U-shaped at the opposed position of the blower port. The air blowing guide member is provided to guide the air blown from the side peripheral surface of the plug fan, and the rotation center of the plug fan is deviated from the center of the U-shaped air blowing guide member and is eccentric. Air conditioner plug fan room.   2. The U-shaped damper according to claim 1, wherein the U-shaped damper is made of a flexible plate-like member, and both ends of the U-shaped damper are connected to a moving member of an opening adjusting means on the upper surface of the rectangular parallelepiped of the plug fan chamber. The plate-like member is suspended in a U-shape so as to be opposed to more than half a circumference of the blower opening of the plug fan, and the opening area formed by both ends of the plate-like member by the opening adjusting means is variable by the moving member. The plug fan chamber of the air conditioner according to claim 1, further comprising an air flow rate adjusting means.

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