JP2002111266A - Ventilator for electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling fan mounting structure of an electronic apparatus which has a simple constitution and an improved maintainability. SOLUTION: A motor fan 1 for exhausting out air in a frame of an electronic apparatus is fixed by four screws 4a-4d, two of which directly fix the motor fan 1 and the other two of which fix a fan cover 2 and the motor fan 1. A net-like grill 3 is held between the fan cover 2 and the motor fan 1. This allows the grill 3 only to be removed by removing the screws 4a, 4c, with holding the fan 1 not falling down, without needing exclusive screws therefor. Thus, the maintainability can be improved for cleaning the grill 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilator for discharging heated air from the inside of a housing of an electronic device such as a karaoke device to the outside, and more particularly to an improvement in maintenance of the device.

[0002]

2. Description of the Related Art Many electronic devices are provided with a ventilation fan for discharging air heated by heat generated by an electronic circuit or the like to the outside. Generally, a ventilation fan is attached to a housing, and the direction of air blowing is a direction for discharging air inside the housing to the outside.

A karaoke apparatus is also provided with the ventilation fan, but the karaoke apparatus is often installed in a place such as a restaurant where the environment is not necessarily good for an electronic apparatus. That is, the restaurant has an atmosphere that contains a lot of moisture and oils and fats due to cooking and has a lot of dust, and has an environment where there are many small insects such as cockroaches.

For this reason, the ventilation section of the karaoke apparatus needs to be provided with a fine net-shaped grill to prevent insects from entering the inside of the apparatus from the opening for the fan, and since the air is not clean, the grill is frequently opened. Need to be cleaned. The direction of air flow from the fan is outward from inside the device, and dust adheres to the inside of the grill.Therefore, the grill must be removed in order to clean it cleanly. The fan itself needs to be cleaned or replaced.

[0005]

However, since the fan has conventionally been mounted inside the housing, when performing maintenance such as cleaning or replacing the fan, the rear panel of the housing is removed to remove the fan. Needed and was very cumbersome.

Therefore, it is conceivable to attach the fan to the outside of the rear panel. However, the grill must be attached to the outside of the fan. Generally, fans and grills are fixed with screws to the rear panel.However, fixing each with separate screws increases the number of screws and complicates the entire mounting structure. There is. In addition, when the fan and the grill are configured to be fixed with the same screw, when the grill is removed, the fan comes off at the same time, and there is a problem that the maintainability of frequently performed grill cleaning scenes is deteriorated. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a ventilation device for an electronic device having a simple configuration and improved maintainability.

[0008]

According to a first aspect of the present invention, there is provided a fan fixed to a plurality of screws outside a housing of an electronic device;
A fan case fixed by being superposed on the side of the fan opposite to the housing using a part of the plurality of screws; and a grill sandwiched between the fan and the fan case. It is characterized by the following. According to a second aspect of the present invention, in the first aspect of the present invention, the screw hole through which the part of the screws of the case penetrates is a small hole that is larger than the screw diameter and smaller than the diameter of the screw head, and the other screw penetrates. The hole is a large hole larger than the screw head. According to a third aspect of the present invention, in the first aspect of the present invention, a screw hole through which the partial screw of the fan case passes is a small hole that is larger than a screw diameter and smaller than a screw head diameter, and other screws are connected to the fan. The mounting position is a bulging portion for housing the screw head therein. The invention according to claim 4 is the invention according to claims 1 to 3,
The fan is attached to the housing with four screws, of which two diagonal screws fix the fan case as the partial screws.

In the present invention, the fan is fixed with a necessary and sufficient number of screws. As a fan for ventilation of an electric device, a motor fan having a frame having a square front shape is generally used. This type of fan has screw holes at the four corners of the frame, and is fixed to the housing of the electronic device with four screws. Then, some of the screws are further passed through the small holes of the fan case and fastened to fix the fan and fix the fan case. A grill is sandwiched between the fan case and the fan.

According to this structure, only the fan case and the grill can be removed by removing some of the screws, and the fan does not come off at that time. At this time, since the electronic device is not operating and the fan is not rotating, there is no problem even if the number of fixing screws is reduced. Then, if all the screws are removed, the fan can be removed from the housing of the electronic device together with the case and the grill, and cleaning and replacement can be performed. Thus, both the fan and the grill (fan case) can be fixed without increasing the number of screws, and only the grill can be removed.

[0011]

FIG. 1 is a perspective view of the back of a karaoke apparatus provided with a ventilating apparatus according to an embodiment of the present invention. FIG. 2 is a front view of a motor fan 1 and a grill 3 of the karaoke apparatus. Is a front view and a side sectional view of a fan case 2 of the karaoke apparatus, and FIG. 4 is an exploded perspective view showing an assembling procedure and an assembling procedure of the motor fan 1, the grill 3, and the fan case 2.

In FIG. 1, a ventilation device 7 is provided outside a rear panel 6 of a housing 5 of the karaoke apparatus. As shown in an exploded perspective view of FIG. 4, the ventilation device 7 includes a motor fan 1, a grill 3, a fan case 2, and screws 4 (4a to 4a).
d) and the like. As shown in FIG. 1, the ventilation device 7 protrudes rearward from the housing of the karaoke apparatus.
For this reason, there is no need for a specially greater depth than before. By providing the ventilation device 7 on the outside in this way, the motor fan 1 and the grill 3 can be cleaned without removing the housing 5 and the back panel 6.

In FIG. 2A, a motor fan 1 is
The opening 12a in the frame 12 having a square front shape is D
The structure has a C motor 10 and a plurality of fins 11. Screw holes 13a to 13 are provided at the four corners of the frame 12.
d has been established. Each of the through holes is larger than the diameter of the screw 4 and smaller than the diameter of the screw head of the screw 4.

In FIG. 2B, the grill is in the form of a fine net and has a shape close to a square, which is the same as the front shape of the motor fan 1. However, four corners are cut out, and screw holes of the motor fan 1 are formed. 13a to 13d.

In FIG. 3, the fan case 2 has a square shape whose front shape matches the front shape of the motor fan 1.
A rising portion 23 for accommodating the motor fan is formed inside each side of the square. It has an opening 20 at the center of the square front. The opening 20 matches the shape of the opening 12 a of the frame 12 of the motor fan 1. Screw holes 21 a to 21 d are formed at four corners on the front of the fan case 2. this house,
21a and 21c located on one diagonal are small holes provided in the steps 22a and 22c, and 21b and 21d located on the other diagonal are large holes. Here, the small hole is a hole that is larger than the diameter of the screw 4 and smaller than the diameter of the screw head of the screw 4, and is a hole fixed by the screw 4 passed through the screw hole. The large hole is a hole larger than the screw head and has a size that cannot be locked by the screw 4.

As shown in the sectional view of FIG.
The residual portions 22a and 22c are formed to protrude inside the fan case 2, that is, toward the motor fan 1 side. The steps of the steps 22 a and 22 c are the same as the thickness of the grill 3. Thereby, the fan case 2 is connected to the grill 3
Is fixed to the motor fan 1 with screws 4 (if there is no step, the fan case 2 is deformed so as to eliminate the space corresponding to the thickness of the grill 3 when the screws 4 are tightened. ).

FIG. 4 is an exploded perspective view showing the procedure for assembling and disassembling the ventilation device 7. Here, the back panel 6 of the karaoke apparatus is provided with an opening 60 for attaching the ventilation device 7 and female screw portions 61a to 61d.
The opening 12a of the motor fan 1 and the opening 20 of the fan case 2 face the opening 60. In addition, female screw portions 61a to 61d formed around the opening 60
Screws 4a to 4d are respectively screwed into the screws.

As an assembling procedure, first, a power cable (not shown) is pulled out from the opening 60 of the rear panel 6 and connected to the motor fan 1. Then, the screws 4b, 4d are passed through the screw holes 13b, 13d of the motor fan 1, screwed into the female screw portions 61b, 61d of the rear panel 6, and tightened. Thereby, the motor fan 1 is fixed to the rear panel 6. However, in this state, the motor fan 1 is not completely fixed enough to rotate.

Next, the grill 3 is fitted into the back of the fan case 2 (see FIG. 3A), and the screws 4a, 4c are passed through the screw holes 21a, 21c and 13a, 13c, so that the female screw portion 61a of the rear panel 6 is formed. , 61c.
As a result, the fan case 2 is fixed to the motor fan 1 and the motor fan 1
In addition to b and 4d, these two screws 4a and 4c are securely fixed to the back panel 6, so that even when the motor is rotated, no vibration or displacement occurs. The grill 3 is also sandwiched between the motor fan 1 and the fan case 2 and is not separated because it is surrounded by the rising portion 23 of the fan case 2.

When cleaning the grill 3 of the ventilation device 7 assembled in this procedure, by removing only the screws 4a and 4c, it is possible to remove only the fan case 2 and the grill 3 without removing the motor fan 1. Can be cleaned with good maintainability. When cleaning or replacing the motor fan 1, four screws 4a are used.
4d may be removed.

FIG. 5 is a view showing another embodiment of the fan case 2. In the above embodiment, the large holes 21b, 2b are formed in the fan case 2 so that the fan case 2 is not locked by the screws 4b, 4d for fixing only the motor fan 1.
1d, but in this embodiment, a large hole 21b,
Instead of 21d, bulging portions 24b and 24d are provided.
The bulging portions 24b and 24d have a size to accommodate screw heads of screws 4b and 4d for fixing the motor fan 1 first when the ventilation device 7 is assembled. The fan case of this embodiment is also assembled and disassembled according to the procedure of FIG.
It is possible to prevent an error that the screws 4b and 4d are accidentally removed when only the grill 3 (fan case 2) is removed.

In the above embodiment, the motor fan 1 has a square front shape and is fixed with four screws. However, the shape of the motor fan and the number of fixing screws are not limited thereto.

[0023]

As described above, according to the present invention, the grill and the fan case can be fixed with only the screw for fixing the ventilation fan, and the structure is simplified.
It is possible to remove only the grill while maintaining the state in which the fan is attached to the electronic device, thereby improving maintainability.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a ventilation device of a karaoke apparatus according to an embodiment of the present invention.

FIG. 2 is a front view of a motor fan and a grill of a ventilation device of the karaoke apparatus.

FIG. 3 is a front view and a side sectional view of a fan case of the ventilation device.

FIG. 4 is an exploded perspective view of the ventilation device.

FIG. 5 is a view showing another embodiment of the fan case.

[Explanation of symbols]

1 ... Fan, 2 ... Fan case, 3 ... Grill, 4 (4a
~ 4d) ... screws, 5 ... housing (of karaoke apparatus), 6 ...
Rear panel (of housing), 7 ... ventilator, 10 ... motor,
11 fin, 12 frame, 12a opening, 13
(13a to 13d): screw hole, 20: opening, 21a,
21c: screw hole (small hole), 21b, 21d: screw hole (large hole), 22a, 22c: stepped portion, 23: rising portion,
30 ... notch, 60 ... opening, 61 (61a-61d)
... female screw part, 24b, 24d ... bulging part

Claims (4)

[Claims] 1. A fan fixed to the outside of a housing of an electronic device with a plurality of screws, and a part of the plurality of screws is used to overlap the fan on the side opposite to the housing. A ventilation device for an electronic device, comprising: a fixed fan case; and a grill sandwiched between the fan and the fan case. 2. A screw hole through which a part of the screw of the case penetrates is a small hole larger than a screw diameter and smaller than a screw head diameter, and a screw hole through which another screw penetrates is a large hole larger than a screw head. The ventilator for an electronic device according to claim 1, wherein 3. A screw hole through which a part of the screws of the fan case penetrates is a small hole larger than a screw diameter and smaller than a screw head diameter, and a position where another screw is attached to the fan accommodates the screw head inside. The ventilation device for an electronic device according to claim 1, wherein the ventilation device has a bulging portion. 4. The fan according to claim 1, wherein the fan is attached to the housing with four screws, of which two diagonal screws fix the fan case as the partial screws. A ventilator for an electronic device as described.