JPH0341117Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is an air conditioner fan motor that has functions that reduce the air blowing noise of centrifugal fans and reduce the input to the motor directly connected to the fan. Regarding the mounting base.

(Prior art) Fan coils, which have a structure that combines a centrifugal fan with a blower mechanism that is directly connected to a motor and a heat exchanger, are often used in air conditioners, but in this case,
Since the fan and the motor have different installation height dimensions, and the motor is generally smaller, the common method is to mount and fix the motor 3 to the common machine frame 1 via a mounting base 4'. As illustrated in FIGS. 5 and 6, a leg member 9 is formed by bending a steel plate into a U-shaped cross section to support the bearing portion of the motor 3, and a front plate is attached to the mounting plate portion 11 of the leg member 9. A mounting base 4' is constituted by a rectangular trapezoidal base member 10' which is joined together and fixed to the machine frame 1.

(Problem to be Solved by the Invention) In the mounting base 4' having such a structure, the bearing supporting side plate 12 of the leg member 9 faces the suction port 7 on the side of the fan 2 at a position close to the suction port 7. Therefore, it is inevitable that a swirling air flow will occur at the location of the mounting base 4'.

On the other hand, the base member 10' is a rectangular base surrounded by the front plate 13 and the four side plates 14' to 17', and serves as a resistor against airflow.

In this way, the mounting base 4' is a place where there is considerable ventilation resistance in the suction air flow path of the fan 2, which has a negative impact on the fan, such as loud air blowing noise and poor air blowing efficiency. As it becomes narrower, the swirling airflow in the same direction as the rotating direction of the fan 2 is generated at the mounting base 4', and the entire amount of this swirling airflow flows between the opposing bearing support side plates 12, 12 of the leg member 9. As a result, the problem of increased motor input and increased energy loss was unavoidable.

This was developed to address the fact that conventional products have various problems, and to reduce motor input and air blowing noise. The present invention is characterized in that the above object is achieved by having a structure in which a part of the swirling airflow can be recovered to the fan suction port.

(Means for Solving the Problems) As is clear from the embodiments shown in the accompanying drawings, the present invention is directed to one side of a centrifugal fan 2 in which a suction port 7 is opened on both sides of the shaft end of a casing 6. A leg member 9 that supports the bearing portion of the motor 3 that is directly connected to the shaft on the surface side.
and a base member 10 that is fixed to the machine frame 1 by integrally bonding a front plate 13 to the mounting portion 11 of the leg member 9, wherein the base member 10 is attached to the front plate 13. Side plates 14, 15 bent toward the machine frame 1 from three of the four circumferential edges of
16, and is formed into a rectangular trapezoid with one side 17 open, and at least one of the side plates 14, 16 adjacent to the open one side 17 is provided with a ventilation hole 18. This ventilation hole 18
The side plate 14 having the motor 3 of the casing 6
facing the shaft-directly connected side suction port 7 and disposed so that the open one side portion 17 and the opposing side plate 15 facing the open one side portion 17 are sequentially positioned along the rotational direction of the fan 2. It is characterized by being

(Function) The mounting base 4 according to the present invention guides a portion of the generated swirling airflow into the base member 10 from the open side 17 of the base member 10, and then passes through the ventilation hole 18 of the side plate 14. Since the swirling airflow can be drawn out and sucked into the facing suction port 7, a part of the swirling airflow can be recovered, and thus the gout resistance and the motor 3 input can be kept low.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 show a fan coil unit according to an embodiment of the present invention, FIG. 1 being an elevational view of the same unit, and FIG. 2 being a sectional view taken along the line indicated by the - line in FIG. As shown in FIG.
Two centrifugal fans 2, 2 that are coaxial and directly fixed to the machine frame 1 with a predetermined interval, each fan 2,
The fan 2 is provided with an air blowing mechanism consisting of motors 3, 3 which are directly connected to the shafts of the fans 2, 2 and installed in the space between the fans 2, 2 and mounted on a mounting base 4, respectively. A fan coil unit is constructed by combining it with a cross-fin heat exchanger 5 which is disposed parallel to and opposite to the machine frame 1.

The two fans 2 are of a centrifugal type, and as shown in FIG. 2, circular suction ports 7 are opened around the axis on both sides of the shaft end of the casing 6, and an air outlet is provided around the shaft circumference of the casing 6. 8 are open and disposed coaxially and in the same phase, and are rotated in the same direction by a motor 3 directly connected to the shaft, forming an inductive fan coil unit having the heat exchanger 5 in the suction air flow path. The conditioned air that has been cooled or heated is blown out from each outlet 8 and can be blown out from a blowout grille through a blowout chamber (not shown).

The mounting base 4 used to fix the motor 3 to the machine frame 1 includes a leg member 9 that supports the bearing portion of the motor 3, and is integrated with the leg member 9 and fixed to the machine frame 1 with bolts and nuts. It is made up of both a base member 10 and a base member 10.

The leg member 9 has a structure in which a thick steel plate is bent into a U-shape, and bearing support side plates 12 are continuously bent at right angles on both sides of a mounting plate portion 11, and each of the side plates 1
A semicircular notch is provided at the end edge of the motor 3, each bearing part of the motor 3 is inserted into this notch, and the motor 3 is fixed by being clamped with a mounting base having an appropriate shape. It is designed to be able to support the frame of

In addition, when supporting the bearing part, it is preferable to interpose a vibration-proof rubber in the notch part to support and fix the bearing part in a vibration-proof manner.

On the other hand, the base member 10 has a structure in which a thick steel plate is bent and formed into a rectangular shape, and as shown in FIG. 3, each mounting plate part 11 of the two leg members 9 is joined together, A rectangular front plate 13 fixed with bolts and nuts, and three side plates 14, 15, 16 bent at right angles from three of the four peripheries of the front plate 13, excluding one of the long sides. and has one side portion 17 corresponding to one of the long sides described above.
is almost completely open.

The base member 10 is configured such that both side plates 14 and 16 adjacent to the open side part 17 face the casing 6 shaft end side surface where the suction ports 7 of the fans 2 and 2 fixed to the machine frame 1 are opened. These are attached to the machine frame 1, but those facing the fan 2 on the side plates 14 and 16, that is, the fan 2
If there is one unit, there will be side plates 14 or 16, and if there are two units, there will be side plates 14 and 16.
A gout hole 18 is made in the hole.

When the base member 10 having such a structure is fixed to a predetermined location of the machine frame 1, the open side portion 17
The inside communicates with the outer periphery through one or two ventilation holes 18, but when fixing to the machine frame 1, it is necessary to ensure that the following conditions are satisfied. be.

That is, the installation of the fan 2, the mounting base 4, and the motor 3 is completed, and the two fans 2 are driven by the motor 3.
In a normal operating state in which the fan 2 rotates in the same direction, the one open side portion 17 and the opposing side plate 15 located opposite the open one side portion 17 are positioned in this order with respect to the rotational direction of the fan 2. That is, it is arranged and fixed so that the open side part 17 is located on the upper side with respect to the opposing side plate 15 based on the swirling airflow generated on the mounting base 4 by the rotation of the fan 2. It is a requirement.

In addition, in FIG. 3, reference numeral 19 denotes a mounting piece that is bent outward at right angles from each side plate 14, 16 and arranged in a row.
Further, 20 is a bolt inserted from above into a hole drilled in a predetermined position of the front plate 13, and the head is attached to the front plate 13.
It is made to hang down from the front plate 13 by being fixed to the inner surface side of the front plate 13 by welding.

The motor mounting base 4 having such a structure has the base member 10 fixed in a predetermined manner to the machine frame 1, and then the two leg members 9, 9 are fixed to the front plate 13 of the base member 10. After that, each motor 3 is supported and fixed to the leg member 9 in a vibration-proof manner, and each fan 2, 2 is attached to the machine frame 1.
2 and the pair of motors 3, 3 are directly connected to the shaft, and the assembly of the ventilation mechanism is completed.

Then, the motors 3, 3 are driven to rotate the fans 2, 2 in the same direction, but as mentioned above, the leg member 9 is located close to the suction port 7, and the motor 3 is placed facing the same direction. As a result, a swirling airflow in the same direction as the direction of rotation of the fan 2 is generated at the location where the motor 3, which serves as the suction air flow path, is disposed.

Of course, the mounting base 4 acts as resistance to this swirling airflow, but the open side 17 of the base member 10 allows the airflow to flow into the base member 10, and the side plates 14 and 16 also allow the airflow to flow into the base member 10. Ventilation hole 18,1
8, the inflowing air flow passes through the ventilation holes 18, 18 without being stagnant, and is then sucked into the facing suction port 7. 17. Since the flow path passing through the space inside the base member 10 and the ventilation hole 18 follows the direction of the swirling airflow, it goes without saying that the flow is smooth, and thus the ventilation resistance and the motor 3
can reduce the input to

Incidentally, the fan 2 and the motor 3 have the same capacity and shape, the mounting base 4 has the same shape, and the way they are attached is the same, but the base member 10 has an open side part 17 and a ventilation hole 18. FIG. 4 shows the results of an experiment in which characteristics were compared between a comparison device that differs from the example in that it uses a stand member 10 formed by bending all the side plates from the four peripheral edges, and the example. However, the present example (shown by the solid line) has lower ventilation resistance while obtaining the same air volume, compared to the comparative example (shown by the dashed-dotted line) by 4% in rotation speed, 13% in motor input,
A decrease of 0.6 dB was evident in the air blowing sound, and some
This clearly shows that there is a significance in opening 7 and providing ventilation holes 18.

(Effect of the invention) As described above, the present invention has an open side part 17 for introducing a part of the swirling airflow into the base member 10 of the mounting base 4, and a suction of the fan 2 to further introduce the introduced airflow. By providing the ventilation hole 18 for guiding the air to the opening 7, it is possible to lower the ventilation resistance to the fan 2, and the rotation speed can be reduced to ensure the same amount of air. By reducing input power, energy loss can be reduced and efficient operation can be achieved.

Further, by lowering the rotational speed, it becomes possible to reduce the air blowing noise, thereby realizing quiet operation.

[Brief explanation of the drawing]

Fig. 1 is an elevation view of a fan coil unit according to an embodiment of the present invention, and Fig. 2 is a -
3 is a perspective view of the base member in FIG. 1, FIG. 4 is a performance comparison diagram between the embodiment of the present invention and a comparative example, and FIG. 5 is an elevation view of a conventional fan coil unit. 6 is a cross-sectional view taken along the - line in FIG. 5. 1... Machine frame, 2... Fan, 3... Motor, 4
...Mounting stand, 6...Casing, 7...Suction port,
9... Leg member, 10... Base member, 11... Mounting plate part, 13... Front plate, 14, 15, 16... Side plate, 17... Open side part, 18... Ventilation hole.

Claims (1)

[Scope of utility model registration request] A leg member 9 supporting a bearing portion of a motor 3 that is directly connected to one side of a centrifugal fan 2 having a suction port 7 opened on both sides of the shaft end side of a casing 6, and a mounting portion of the leg member 9. 11 and a base member 10 which is fixed to the machine frame 1 by integrally bonding a front plate 13 to the base member 11, the base member 10 is attached from three of the four peripheral edges of the front plate 13. It has side plates 14, 15, and 16 bent toward the machine frame 1 side, and is formed into a rectangular base with one side 17 open, and both side plates 14 adjacent to the open one side 17, A ventilation hole 18 is bored in at least one of the openings 16, and the side plate 14 having the ventilation hole 18 faces the suction port 7 on the shaft-directly connected side of the motor 3 of the casing 6, and
7, and an opposing side plate 15 opposite to the open side portion 17.
A motor mounting base for an air conditioner fan, characterized in that the motor mounting base for an air conditioner fan is arranged so as to be sequentially located along the rotational direction of the fan 2.