JP2008291815A - Fan and projection-type image-display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fan wherein a fan main-body is held so as to be isolated from vibration, and electronic components are protected from static breakdown caused by static electricity produced inside and outside the components. <P>SOLUTION: A vibration-proof rubber frame 4 holds the fan main-body 2 provided with electronic components so that the components are isolated from vibration, and has a frame body 4a having a square-barrel shape when viewed from the front. A disk shaped insulating material 4c is formed in the central part behind the frame body 4a. The insulating material 4c is supported equally by four pieces of ribs 4c2 formed inwardly from the center of each side of the frame body 4a. The vibration-proof rubber frame 4 is formed of insulating rubber. The fan main-body 2 is provided with a square-barrel shaped frame 2a for supporting rotatably the blades 2c. The vibration-proof rubber frame 4 surrounds the peripheral wall of the frame 2a to support it so as to be vibration-proof. The insulating material 4c of the vibration-proof rubber frame 4 protects electronic components of the fan main-body 2 from static generated by exhaust-air friction in an exhaust louver 6a1 installed in the exhaust opening of the projection-type image-display device, or from static generated by contact of human bodies, and other objects which bear electrical charges. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a blower that protects electronic components of a blower body from electrostatic breakdown and a projection-type image display device including the blower.

  2. Description of the Related Art Conventionally, electronic devices such as personal computers and projectors have been equipped with a blower having a compression ratio of 1.1 or less among air blowers in order to air-cool and heat exhaust electronic components. Since the blower rotates blades with a motor, aerodynamic noise, motor noise, and the like are generated, and anti-vibration measures are taken with laminated rubber or anti-vibration rubber to reduce noise.

When cooling the entire area inside the electronic device, the blower is often disposed close to the exhaust port on the downstream side. In an environment where static electricity may be generated at the exhaust port, for example, when an electronic device is operated or carried, the electronic components of the blower may be damaged by external static electricity due to static electricity of the human body. In addition, when a synthetic resin exhaust louver is provided close to the blower, static electricity is generated by friction of air, the exhaust louver is charged, and the electronic components that drive the fan motor are destroyed by the static electricity. It can happen.
In order to prevent the electronic components from being damaged by static electricity, a technology for shielding the electronic component mounting board on which the electronic component is mounted with a conductor is widely known. For example, a fan motor that covers the outside of the housing of the electronic component mounting board with an aluminum layer is proposed. (For example, Patent Document 1).
JP 2003-88046 A

  However, the shielding technique as in Patent Document 1 requires a shielding material, which increases the cost and the space efficiency in the electronic device is not good.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an anti-vibration support for the main body of the blower by providing an insulator to the anti-vibration support of the main body of the blower. Another object of the present invention is to provide a blower capable of protecting electronic components from electrostatic breakdown due to internal and external static electricity and a space-efficient projection type image display device.

  The blower of the present invention includes a blower body facing the charged body, and a vibration isolating body that supports the blower body in a vibration-proof manner, and protects electronic components included in the blower body from electrostatic damage caused by the charged body. In the air blower having the structure, the vibration isolator has an insulator facing the charged body.

In the blower of the present invention having such a configuration, the blower body blows air toward the member to be charged, static electricity is generated in the member to be charged due to friction of air, and the member to be charged is charged. Further, static electricity is generated by friction caused by the movement of the charged body itself, and the charged body is charged. The insulator faces the inner and outer charged bodies, and ensures at least a distance corresponding to the thickness of the insulator from the charged body to ensure electrical insulation from the charged body, so that electrostatic discharge does not occur and the insulator Protects the electronic components of the blower body from electrostatic damage.
The vibration isolator supports the blower body in a vibration-proof manner, suppresses vibrations of the blower body and transmits the vibration, and noise from the blower body is reduced.

  In the blower of the present invention, the vibration isolator is made of rubber.

  In the blower of the present invention having such a configuration, the vibration isolator has both the vibration proof property and the insulating property, and the miniaturization becomes easy.

  In the blower of the present invention, the blower body includes a cylindrical frame that rotatably supports the blades of the blower body, and the vibration isolator forms a frame that surrounds the peripheral wall of the frame. The insulator is provided on one end side of the body.

  In the blower of the present invention configured as described above, the vibration isolator supports the blower main body in an anti-vibration manner corresponding to the form of the frame, and the insulator mounted on the frame opposes the member to be charged.

  In the blower according to the present invention, the blower main body has flanges on the suction side and the discharge side, respectively, and the vibration isolator forms a frame constructed between outer edges of the flange, The insulator is provided on the discharge side.

  In the blower of the present invention having such a configuration, the vibration isolator supports the both flanges of the blower body in an anti-vibration manner, and the insulator mounted on the discharge side of the frame body faces the charged body.

  The blower according to the present invention is characterized in that the blower main body has a housing portion that houses a substrate on which the electronic component is disposed, and the housing portion is covered with the insulator.

  In the blower of the present invention having such a configuration, the insulator reliably protects the housing portion that houses the substrate from static electricity.

  The projection type image display apparatus according to the present invention is characterized in that the above-described blower is attached to an exhaust port in which an exhaust louver is fitted and thermally exhausted.

In the projection type image display apparatus of the present invention having such a configuration, when the blower body blows air toward the exhaust louver of the exhaust port, static electricity is generated in the exhaust louver due to friction of air, and the exhaust louver is charged. The insulator ensures electrical insulation from the exhaust louver by ensuring the distance from the charged exhaust louver to the thickness of the insulator, and electrostatic discharge does not occur. Protect.
The vibration isolator supports the blower main body in a vibration-proof manner, suppresses vibrations of the blower main body and transmits the noise, and the noise generated by the blower main body is reduced, and the projection-type image display device is silenced.

The blower of the present invention includes an insulator that protects the electronic component from electrostatic breakdown in the vibration isolator that supports the blower body in a vibration-proof manner. This has the effect that the electronic components of the main body can be protected from electrostatic breakdown due to internal and external static electricity.
Therefore, in the blower of the present invention, since the vibration isolator that supports the blower main body is used for both vibration prevention and electrostatic countermeasures, a shield material is unnecessary and the cost is low.

  In the projection type image display device of the present invention, the anti-vibration body that supports the blower body in anti-vibration uses both anti-vibration measures and anti-static measures, so there is no need to prepare separate parts for anti-static measures. The cost can be reduced, and the space efficiency of the projection display apparatus is improved.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment will be described below with reference to the drawings, taking as an example a projection type video display device in which a blower according to the present invention used as an exhaust fan is attached to an exhaust port and thermally exhausted.
(Embodiment 1)
1 is a perspective view showing a blower main body to which a vibration isolating rubber frame according to Embodiment 1 is attached, FIG. 2 is a perspective view showing the blower main body, and FIG. 3 is a perspective view showing a vibration isolating rubber frame.
In the blower of the present invention according to Embodiment 1, the blower main body 2 is an axial fan and includes a vibration-proof rubber frame 4. The anti-vibration rubber frame 4 is formed so as to correspond to the shape of the flange 2 b of the blower body 2.

The blower main body 2 includes square flanges 2b and 2b on the suction side and the discharge side of the cylindrical frame 2a. A hemispherical impeller hub 2d is provided at the center of the blade 2c of the blower body 2, and the hemispherical side is the suction side.
A bottomed cylindrical rotor case 2f provided with a substrate 3 (see FIG. 7) is provided at the rear side of the discharge side of the impeller hub 2d with the bottom facing the discharge side. A rotating shaft (not shown) of a motor provided in the rotor case 2f supports the impeller hub 2d.
The bottom 2f1 of the rotor case 2f is fixed to the center of the discharge-side flange 2b by four spokes 2h. Electronic components 3a (see FIG. 7) such as a motor drive circuit and a control circuit for driving a motor that rotates the blower body 2 are mounted on the substrate 3.
The frame 2a, the flanges 2b and 2b, the rotor case 2f and the spokes 2h, 2h, 2h and 2h are made of synthetic resin and integrally formed.

  The insulating anti-vibration rubber frame 4 is erected from the outer edge of the suction-side flange 2b to the outer edge of the discharge-side flange 2b. The anti-vibration rubber frame 4 has a cylindrical frame body 4 a having a square shape when viewed from the front, and the peripheral wall of the frame body 4 a has the same rectangular shape corresponding to the outer shape of the blower body 2. Two rectangular holes having the same shape are formed in the four peripheral walls of the frame 4a.

Edges 4b having a right isosceles triangle shape are formed at the four corners on the front side of the frame 4a with the bottom side inward, and the four edges 4b are in contact with the squares on the front surface of the flange 2b on the suction side. . A disc-shaped insulator 4c is formed on the rear side of the frame 4a to protect the electronic component 3a of the blower body 2 from electrostatic breakdown.
The insulator 4c is supported substantially evenly by four ribs 4c2 extending inwardly from the center of each side of the square forming the rear edge of the frame 4a. The insulator 4c is formed in the central part on the rear side of the frame 4a in close contact with the bottom 2f1 of the rotor case 2f.

The thickness of the anti-vibration rubber frame 4 is about 1.5 mm in consideration of the electrostatic breakdown protection effect and the anti-vibration effect.
The anti-vibration rubber frame 4 is a single component, is simple, small and moderately soft, and can be easily formed into an appropriate shape. The anti-vibration rubber frame 4 is an anti-vibration body having a three-dimensional, three-way spring-like characteristic, and the natural frequency of the projection-type image display device 6 is lower than the vibration frequency of the blower body 2. It is chosen to do.

4 is a perspective view of the projection-type image display device according to Embodiment 1 as viewed from the front side, and FIG. 5 is an enlarged view of the main part showing the positional relationship between the blower body with the anti-vibration rubber frame attached and the exhaust louver. .
In the projection display apparatus 6, an exhaust port 6 a is formed near one side of the front surface of the projection display apparatus 6. An exhaust louver 6a1 is fitted in the exhaust port 6a. The blower body 2 is disposed close to and opposed to the rear portion of the exhaust louver 6a1. The blower main body 2 is supported in a vibration-proof manner by a vibration-proof rubber frame 4 including the insulator 4c according to the first embodiment.

  Corresponding to the upper peripheral wall and the lower peripheral wall of the frame body 4a of the anti-vibration rubber frame 4, the frame body 4a attached to the blower main body 2 is attached to the ceiling surface and the floor surface of the projection display 6 and the ceiling surface and A rectangular cylindrical projection (not shown) for clamping and fixing on the floor surface is provided so as to be opposed.

Next, the operation of the blower main body to which the anti-vibration rubber frame 4 according to Embodiment 1 is attached will be described.
As shown in FIG. 5, the hot air A exhausted by the blower main body 2 from the projection type image display device 6 to the outside collides with the surface of the exhaust louver 6a1 made of synthetic resin, and the exhaust air louver 6a1 is caused by friction with the hot air A. Static electricity is generated and charged. Further, static electricity is generated by friction due to movement of the human body or dynamic contact between objects, and the human body or object is charged.

Since the blower main body 2 and the exhaust louver 6a1 are close to each other, accumulated static electricity is generated in the blower main body 2 such as when a charged human body or object contacts the exhaust louver 6a1 or when the exhaust louver 6a1 is charged. Although there is a possibility of flying toward the substrate 3, since the insulator 4c according to Embodiment 1 is provided on the exhaust louver 6a1 side of the blower body 2, the insulator 4c has at least the thickness of the exhaust louver 6a1 and the insulator 4c. A sufficient distance is secured to electrically insulate the human body and the object that generate static electricity or the exhaust louver 6a1, and electrostatic discharge does not occur.
The anti-vibration rubber frame 4 supports the blower main body 2 in an anti-vibration manner, suppresses vibrations transmitted by the blower main body 2, transmits noise, reduces noise caused by the blower main body 2, and silences the projection-type image display device 6.

The blower main body 2 to which the anti-vibration rubber frame 4 according to the first embodiment having such a configuration is attached not only supports the blower main body 2 to be vibration-proof, but also in an environment where static electricity is generated. The electronic component 3a is protected from static electricity, and the electronic component 3a is not damaged by static electricity.
Therefore, in the blower of the present invention according to Embodiment 1, the anti-vibration rubber frame 4 serves both as the anti-vibration measure and the anti-static measure of the blower main body 2, so that it is not necessary to prepare separate parts and reduce the cost. This can improve the space efficiency of the projection-type image display device 6.

(Embodiment 2)
FIG. 6 is a perspective view showing a vibration isolating rubber frame according to the second embodiment.
The anti-vibration rubber frame 8 according to the second embodiment has the same configuration except for the structure of the insulator 4c of the anti-vibration rubber frame 4 according to the first embodiment. In FIG. 6, members that are substantially the same as those in the first embodiment are denoted by the same reference numerals.
The anti-vibration rubber frame 8 according to the second embodiment has the same frame body 8a as that of the first embodiment, and corresponds to the bottom 2f1 of the rotor case 2f of the blower body 2 at the center of the rear side of the frame body 8a. A cylindrical insulator 8c is formed. The insulator 8c has peripheral walls 8c1, 8c1, 8c1, and 8c1 erected at four locations on the periphery of the insulator 8c, except for portions integrated with the spokes 2h, 2h, 2h, and 2h. Each peripheral wall 8c1 is in contact with the peripheral surface from the bottom 2f1 of the rotor case 2f to about 5 mm and surrounds the rotor case 2f.

Next, the operation of the vibration isolating rubber frame according to Embodiment 2 will be described.
FIG. 7 is an enlarged view of a main part showing the positional relationship between the blower main body to which the vibration isolating rubber frame according to Embodiment 2 is attached and the exhaust louver. In FIG. 7, reference numeral 6a2 indicates an opening of the exhaust louver 6a1, and reference numerals 10a and 10b indicate discharge probes.
As shown in FIG. 7, when the anti-vibration rubber frame 8 is attached to the blower body 2, the bottom 2f1 side of the rotor case 2f of the blower body 2 is fitted inside the peripheral wall 8c1 of the insulator 8c, and the circumferential surface of the rotor case 2f Enclose.

The hot air A exhausted by the blower main body 2 collides with the exhaust louver 6a1 made of synthetic resin, and the exhaust louver 6a1 is charged by friction caused by the hot air A. Further, static electricity is generated by friction due to movement of the human body or dynamic contact between objects, and the human body or object is charged.
When static electricity is generated in the environment, such as when a charged human body or object comes into contact with the exhaust louver 6a1, or when the exhaust louver 6a1 is charged, the insulator 8c surrounding the bottom 2f1 of the rotor case 2f has at least static electricity. The generated human body and object or the exhaust louver 6a1 and the insulator 8c are secured at a distance corresponding to the thickness to electrically insulate the environment where static electricity is generated, and electrostatic discharge does not occur.

In particular, when the blower main body 2 and the exhaust louver 6a1 are in close contact with each other (the gap is illustrated in FIG. 7), electrostatic discharge may occur toward the side of the rotor case 2f. The peripheral wall 8c1 of 8c is electrically insulated from the external environment, and electrostatic discharge does not occur.
The anti-vibration rubber frame 8 supports the blower body 2 in a vibration-proof manner, suppresses vibrations transmitted by the blower body 2, and transmits noise, thereby reducing noise from the blower body 2.

  The anti-vibration rubber frame 8 according to the second embodiment having such a configuration not only provides vibration-proof support for the blower main body 2 but also prevents the electronic component 3a of the blower main body 2 from static electricity even in an environment where static electricity is generated. The electronic component 3a is protected from being damaged by static electricity.

  In the first and second embodiments, the vibration isolating rubber is used as the vibration isolating material, but any type of anti-vibration isolating material may be used. The anti-vibration rubber frames 4 and 8 are formed so as to correspond to the shape of the flange 2b of the blower body 2. However, in the case of a type of fan without the flange 2b, the anti-vibration rubber frames 4 and 8 are made to correspond to the frame 2a that rotatably supports the blades. May be formed.

The anti-vibration rubber frame 4 according to the first embodiment is provided with a peripheral wall on the side, but the peripheral wall on the side may not be provided, and an insulator that connects the upper peripheral wall, the lower peripheral wall, and the upper and lower peripheral walls. 4c may be used.
In the second embodiment, the peripheral wall 8c1 of the insulator 8c is formed so as to avoid the spoke 2h. However, in the case of a structure that does not need to be avoided, the insulator 8c itself has a bottomed cylindrical shape, and the rotor case 2f The bottom 2f1 side may be fitted.

Next, examples will be described.
The anti-vibration rubber frames 4 and 8 have a length × width × depth of 80 mm × 80 mm × 30 mm, a wall thickness of 1.5 mm, the diameter of the insulators 4c and 8c is φ36 mm, the height of the peripheral wall 8c1 is 6 mm, and the length of the rectangular hole X The side is 18 mm x 30 mm, and is attached to an axial fan (blower body 2) with a square flange 2b.

  When the insulators 4c and 8c of the first and second embodiments are not provided, the discharge probe 10a (see FIG. 7) is brought close to the bottom 2f1 of the rotor case 2f from the opening 6a2 of the exhaust louver 6a1 to a distance of 2 mm, and a voltage of 20 kV is applied. When applied, electrostatic discharge is generated and the electronic component 3a is destroyed. However, when the insulators 4c and 8c according to the first embodiment are present, the electrostatic discharge does not occur even under the same conditions, and the electronic component 3a. Was not destroyed.

Furthermore, as shown in FIG. 7, when there is an insulator 8c including the peripheral wall 8c1 according to the second embodiment, the discharge probe 10b is brought close to the opening 6a3, and electrostatic discharge does not occur even under the same conditions as described above. The electronic component 3a was not destroyed.
As described above, the insulators 4c and 8c according to the first and second embodiments do not generate electrostatic discharge even when the exhaust louver 6a1 is charged, and can protect the electronic component 3a from static electricity.

It is a perspective view which shows the air blower main body which attached the vibration-proof rubber frame which concerns on Embodiment 1. FIG. It is a perspective view which shows an air blower main body. It is a perspective view which shows a vibration-proof rubber frame. It is the perspective view which looked at the projection type video display apparatus concerning Embodiment 1 from the front side. It is a principal part enlarged view which shows the positional relationship of the air blower main body which attached the vibration-proof rubber frame, and an exhaust louver. 5 is a perspective view showing a vibration-proof rubber frame according to Embodiment 2. FIG. It is a principal part enlarged view which shows the positional relationship of the air blower which attached the vibration-proof rubber frame which concerns on Embodiment 2, and an exhaust louver.

Explanation of symbols

2 Blower body 2a Frame 2b Flange 2c Blade 2f Rotor case (housing part)
3 Substrate 3a Electronic component 4, 8 Anti-vibration rubber frame (vibration isolator)
4a, 8a Frame 4c, 8c Insulator 6 Projection-type image display device

Claims (6)

A blower body facing the body to be charged;
A blower provided with a vibration isolator that supports the blower main body in an anti-vibration manner, and has a structure that protects electronic components of the blower main body from electrostatic breakdown by the charged body.
The blower according to claim 1, wherein the vibration isolator has an insulator facing the member to be charged.   The blower according to claim 1, wherein the vibration isolator is made of rubber. The blower body includes a cylindrical frame that rotatably supports the blades of the blower body,
The vibration isolator has a frame surrounding the peripheral wall of the frame,
The blower according to claim 1 or 2, wherein the insulator is provided on one end side of the frame. The blower body has flanges on the suction side and the discharge side,
The vibration isolator forms a frame constructed between the outer edges of the flange,
The blower according to claim 1 or 2, wherein the insulator is provided on the discharge side of the frame. The blower main body has a housing portion that houses a substrate on which the electronic component is disposed,
The blower according to any one of claims 1 to 4, wherein the housing portion is covered with the insulator.   A projection-type image display device, wherein the blower according to any one of claims 1 to 5 is attached to an exhaust port in which an exhaust louver is inserted, and is thermally exhausted.

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