JP4741124B2 - Ventilation fan improvement structure and ventilation fan improvement method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improved structure and an improved method for a ventilation fan, and more specifically, a fan-shaped rotating blade portion is attached to a rotating shaft of a motor, and only a part of the rotating blade portion in the rotating shaft core direction is enclosed around the rotating shaft core. The present invention relates to an improved structure and an improved method for a ventilation fan provided with an annular frame.
[0002]
[Prior art]
Conventionally, as for the above-described ventilation fan, as shown in FIG. 7, a prefabricated structure in which only a part in the direction of the rotation axis of the fan-shaped rotary blade portion 6 is surrounded by an annular frame 1 (in other words, a rotation The rotating blade part 6 was used as it was in the axial direction in the axial direction.
[0003]
[Problems to be solved by the invention]
However, although this type of ventilation fan is inexpensive, the change in the generated pressure P occurs in a small air volume region as shown by a characteristic curve M ′ (hereinafter referred to as a PQ characteristic curve) for the pressure P and the air volume Q in FIG. There is a so-called trough (a portion in the figure) that becomes slow (or a downward-declining trend), and in this part the operation becomes extremely unstable, so even if it is called a pressure ventilation fan, it is practical For example, the operating point is limited to a low-pressure large air volume region (that is, a region where the blowing resistance is small) as indicated by a point B in the figure, and there is a problem in that the application is extremely limited. In FIG. 8, R1 and R2 are resistance curves of the blower system.
[0004]
In view of this situation, the main problem of the present invention is to effectively solve the above-mentioned problem while reducing the apparatus cost by a rational improvement structure.
[0005]
[Means for Solving the Problems]
[1] The invention according to claim 1 relates to a ventilation fan improvement structure,
About the ventilation fan provided with an annular frame that surrounds only a part of the rotary blade part in the direction of the rotation axis while surrounding the fan type rotary blade part on the rotation axis of the motor,
A cylindrical body is added to and connected to the frame body in the direction of the rotational axis, and the position of the rotary blade is adjusted in the direction of the rotational axis so that the entirety of the rotating blade portion is within the wind tunnel formed by the frame body and the cylindrical body. to be placed,
The rotary blade portion is disposed in a state where the entire rotary blade portion is accommodated in the wind tunnel in a state where the rotary blade portion is attached to an extension shaft that is connected to and connected to the rotary shaft .
[0006]
In other words, according to this configuration, the entire rotary blade portion can be effectively interacted with the wind tunnel composed of the frame body and the cylindrical body in the direction of the rotation axis, thereby providing a large blowing resistance (large back pressure). Even in the presence of air, it is possible to effectively prevent a part of the blown gas from leaking back into the suction side, effectively increasing the resistance against the blowing resistance, It is also possible to effectively smooth the gas flow before and after the rotary blade portion (suction side and discharge side).
[0007]
That is, the above-mentioned valleys in the PQ characteristic curve can be effectively eliminated by these things, and compared with the ventilation fan before improvement (ventilation fan in which only a part of the rotary blade part is surrounded by an annular frame). The maximum value of the generated pressure can be effectively increased, and a stable operating state can be obtained even in a small air volume region (region where the blowing resistance is large), and it can be used well over a wide air flow range, By these things, the application range of a ventilation fan can be expanded greatly.
[0008]
And while achieving the improvement of the effective air blowing performance in this way, the improved part is only the addition of the cylindrical body and the arrangement change of the rotary blade part, and the main parts such as the frame, the rotary blade part, the motor etc. Since an inexpensive off-the-shelf fan can be used as it is, the overall apparatus cost can be reduced.
[0009]
FIG. 6 shows comparison data of the ventilation fan before the improvement and the improvement ventilation fan in which the invention according to claim 1 is applied to the ventilation fan, where M ′ is the PC characteristic curve of the ventilation fan before the improvement, and M is the PC characteristic curve of the improvement ventilation fan. Yes, as can be seen from this comparison data, the valleys of the improved ventilation fan are effectively eliminated compared to the ventilation fan before the improvement.
[0010]
In addition, the fan-shaped rotary blade portion referred to in the present specification refers to one in which a plurality of shell-shaped blades whose blade width is larger toward the outer side in the radial direction are arranged at equal intervals in the circumferential direction.
[0011]
Further, in the invention according to claim 1, wherein said rotary blade section to the extension shaft connected replenishment to the rotary shaft in a state fitted with, since whole the rotary blade unit is disposed in a state fit to the air channel The following effects can also be obtained.
[0012]
In other words, according to this configuration, in order to arrange the rotary blade portion so that the entirety of the rotary blade portion is accommodated in the wind tunnel, the rotary blade portion is attached to the extended shaft connected to the motor rotary shaft. Since the position of the rotating blade is adjusted by attaching, it is not necessary to change the position of the motor to adjust the position of the rotating blade, and the motor support structure is a ready-made support structure. (A structure in which the motor is connected to the annular frame body via the support leg) can be used as it is, and thereby the overall apparatus cost can be further reduced.
[0013]
[ 2 ] The invention according to claim 2 relates to a ventilation fan improvement method ,
About the ventilation fan provided with an annular frame that surrounds only a part of the rotary blade part in the direction of the rotation axis while surrounding the fan type rotary blade part on the rotation axis of the motor,
A cylindrical body is added to and connected to the frame body in the direction of the rotational axis, and the position of the rotary blade is adjusted in the direction of the rotational axis so that the entirety of the rotating blade portion is within the wind tunnel formed by the frame body and the cylindrical body. To place
The position of the rotating blade portion is changed to the connection side of the cylindrical body with respect to the frame body together with the motor so that the entire rotating blade portion is accommodated in the wind tunnel.
[0014]
That is, according to this method , in order to arrange the rotary blade portion so that the entirety of the rotary blade portion fits in the wind tunnel in the direction of the rotation axis, the structure in which the rotary blade portion is attached to the motor rotation shaft (that is, Since the prefabricated mounting structure of the rotating blade portion with respect to the motor is maintained, the rotating blade portion of the rotating blade portion at the time of rotation is compared with the case where the rotating blade portion is attached to the extended shaft connected to the motor rotating shaft as described above. Blur (blurring caused by the lengthening of the shaft) can be avoided more reliably, and thereby effective improvement of the air blowing performance can be achieved more reliably.
In addition, according to this method, the valleys as described above in the PQ characteristic curve can be effectively eliminated, and the ventilation fan before improvement (ventilation fan in which only a part of the rotary blade part is surrounded by an annular frame) Compared to the above, the maximum value of the generated pressure can be effectively increased, and a stable operating state can be obtained even in a small air volume region (region where the air blowing resistance is large), so that it can be used well over a wide air flow range. This is the same as the invention according to claim 1 in that the application range of the ventilation fan can be greatly expanded.
[3] The invention according to claim 3 specifies a preferred embodiment for carrying out the invention according to claim 2, and its features are:
It exists in the point which connects the said cylindrical body to the leeward side of the said frame in the ventilation fan ventilation direction.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 and FIG. 2 show an improved ventilation fan in which the ready-made pressure ventilation fan shown in FIG. 7 is modified, and a cylindrical frame 1 from the opposite side of the motor arrangement side with respect to the annular pre-made frame body 1 having a bell mouth structure. The body 2 is added and connected by the flange connection structure, and the frame 1 and the cylindrical body 2 form the wind tunnel 3.
[0016]
Further, with respect to the motor support structure that supports the motor 4 on the frame body 1 via the support legs 5, the length of the support legs 5 in the motor rotation axis direction is made shorter than that of the ready-made ventilation fan. The position of the fan-shaped rotary blade portion 6 attached to the shaft 4 a is changed to the cylindrical body 2 side together with the motor 4 itself, so that the entire rotary blade portion 6 is accommodated in the wind tunnel 3.
[0017]
That is, by arranging the entire rotary blade 6 inside the wind tunnel 3 in this way, the entire rotary blade 6 is effectively interacted with the wind tunnel 3, and thereby, the PQ characteristic curve of the ready-made ventilation fan before improvement is obtained. Eliminating the valleys in the small air volume region (part a in FIG. 8) seen in M ′ (see FIG. 8), the air blowing performance is effectively improved.
[0018]
Moreover, about the main parts, such as the frame 1, the fan-shaped rotary blade part 6, the motor 4, etc., the thing of a ready-made ventilation fan is used as it is, and the apparatus cost as a whole is reduced.
[0019]
FIG. 3 shows an example in which the above-described improved ventilation fan is attached to the wall 7. The end flange portion 2 a of the cylindrical body 2 is connected and fixed to the wall 7 with the opening) facing, and the improved ventilation fan is attached to the wall 7. A weather hood 9 is attached to the wall 7 on the outside.
[0020]
FIG. 4 shows an example in which the above-described improved ventilation fan is interposed in the duct 10. A mounting plate 11 is provided inside the duct at the flange connection portion of the duct 10, and the cylindrical body 2 is formed in the ventilation opening 12 formed in the mounting plate 11. The end flange portion 2a of the cylindrical body 2 is connected and fixed to the mounting plate 11 with the end opening (end opening of the wind tunnel 3) facing, and the improved ventilation fan is interposed in the duct 10.
[0021]
[Another embodiment]
In the above embodiment, an improved structure (that is, the rotating blade portion 6 is disposed in the motor 4 in a state where the rotating blade portion 6 is entirely accommodated in the wind tunnel 3 with the rotating blade portion 6 attached to the motor rotating shaft 4a. In addition, an improved structure is shown in which the position of the rotating blade portion 6 is changed to the inside of the wind tunnel 3 by changing the position to the cylindrical body 2 side. Instead, as shown in FIG. By attaching the rotating blade portion 6 to the extension shaft 13 that is connected to the shaft 4a and connecting it, an improved structure for accommodating the entire rotating blade portion 6 inside the wind tunnel 3 while using the motor support structure of a pre-made ventilation fan as it is may be adopted. Good.
[0022]
Further, depending on the case, an improved structure in which the entire rotary blade portion 6 is accommodated in the wind tunnel 3 by using the position change of the motor 4 and the attachment of the rotary blade portion 6 to the extension shaft 13 may be adopted.
[0023]
The air blowing direction of the improved ventilation fan is not limited to the direction in which the ready-made frame 1 is on the windward side with respect to the cylindrical body 2, and may be the air blowing direction opposite to that.
[0024]
The specific connection structure between the ready-made frame body 1 and the cylindrical body 2 and the specific motor support structure when the position of the motor 4 is changed are not limited to the structure shown in the above-described embodiment, and various modifications are possible. is there.
[0025]
The installation type of the improved ventilation fan is not limited to the wall mounting type shown in FIG. 3 or the duct-mounted type shown in FIG. 4, and various installation types can be adopted according to the use of the improved ventilation fan. The specific mounting support structure can be variously changed according to the installation type.
[Brief description of the drawings]
1 is a side view of an improved ventilation fan. FIG. 2 is a rear view of the improved ventilation fan. FIG. 3 is a side view showing a wall mounting structure. FIG. 4 is a side view showing a duct interposing structure. Side view of improved ventilation fan [Fig. 6] Graph showing comparison data [Fig. 7] Side view of ready-made ventilation fan showing conventional example [Fig. 8] Graph showing characteristics of ready-made ventilation fan [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Frame 2 Cylindrical body 3 Wind tunnel 4 Motor 4a Rotating shaft 6 Rotating blade part 13 Extension shaft

Claims (3)

About the ventilation fan provided with an annular frame that surrounds only a part of the rotary blade part in the direction of the rotation axis while surrounding the fan type rotary blade part on the rotation axis of the motor,
A cylindrical body is added to and connected to the frame body in the direction of the rotational axis, and the position of the rotary blade is adjusted in the direction of the rotational axis so that the entirety of the rotating blade portion is within the wind tunnel formed by the frame body and the cylindrical body. To place
A ventilation fan improvement structure in which the rotary blade portion is disposed in a state where the entire rotary blade portion is accommodated in the wind tunnel in a state where the rotary blade portion is attached to an extension shaft that is connected to and connected to the rotary shaft . About the ventilation fan provided with an annular frame that surrounds only a part of the rotary blade part in the direction of the rotation axis while surrounding the fan type rotary blade part on the rotation axis of the motor,
A cylindrical body is added to and connected to the frame body in the direction of the rotational axis, and the position of the rotary blade is adjusted in the direction of the rotational axis so that the entirety of the rotating blade portion is within the wind tunnel formed by the frame body and the cylindrical body. To place
The ventilation fan improvement method which changes the position of the said rotary blade part to the connection side of the said cylindrical body with respect to the said frame with the said motor, and makes the said rotary blade part the state accommodated in the said wind tunnel. The ventilation fan improvement method of Claim 2 which connects the said cylindrical body to the leeward side of the said frame in the ventilation fan ventilation direction.

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