CN111852907A - Blower and blower case - Google Patents

Abstract

The invention provides a blower and a box for the blower, the sound absorption effect is improved, and the cooling efficiency is good. The blower includes a blower main body and a box covering the periphery and the upper part of the blower. The blower main body includes: an electric motor; a blade for the blower, which is fixed on the side of the rotating shaft of the electric motor that is close to the load; a fan, which is fixed on the load side. the side opposite to the load of the rotating shaft; and the suction port and the blower port located at the lower part of the fan, and the casing has: a storage chamber which accommodates the blower main body; a side of the storage chamber adjacent to the fan is provided adjacently; a duct chamber, which is adjacent to the intake chamber, accommodates a duct extending from the air outlet to a position above the storage chamber; and a sound absorbing chamber and an exhaust chamber adjacent to the upper part of the storage chamber and the intake chamber.

Description

Blowers and Blower Enclosures

technical field

The present invention relates to a blower, and more particularly, to a blower having a blower main body and a case housing the blower main body.

Background technique

In the vortex blower mechanism, an annular flow path from the suction port to the blower outlet is formed by a fan casing provided opposite to the impeller, and gas is sucked from the suction port by the rotational motion of the impeller driven by the motor, and the inside of the flow path is pressurized .

In recent years, various researches and developments have been carried out on the structure and shape of the impeller in response to increasing demands for blowers to be smaller and lighter in size, higher in blowing pressure, and lower in noise. At the same time, the cabinet that accommodates them is also required to be small, lightweight, and sound-deadening.

As described above, regarding the noise reduction of the blower, for example, Patent Document 1 discloses a noise reduction device in which the blower is housed. The sound-absorbing device covers the blower with the box body pasted with the sound-absorbing material, and includes a sound-absorbing passage and a sound-absorbing duct for absorbing noise from the blower.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Application Laid-Open No. 10-220390

SUMMARY OF THE INVENTION

The technical problem to be solved by the invention

Compared with Patent Document 1, there is a technical problem of further reducing the weight and improving the noise reduction effect. In response to such a technical problem, there is known a Helmholtz sound absorption technique in which a plurality of holes are formed in a metal to absorb sound in a specific frequency region.

However, since the Helmholtz sound absorption absorbs only the sound of a specific frequency, even if it is applied to the noise cancellation device to absorb the frequency that becomes the peak of the noise, other frequencies cannot be absorbed. Then, the inventors of the present invention examined whether or not the noise reduction effect can be improved by using in combination with sound absorbing materials such as urethane conventionally used. As a result, although the noise reduction effect can be improved, since the thermal conductivity of the urethane material is low, a new technical problem arises in that the temperature inside the cabinet rises.

An object of the present invention is to provide a blower including a noise reduction device capable of improving the noise reduction effect and preventing a temperature rise.

Technical solutions for solving technical problems

In order to solve the above-mentioned technical problems, for example, the invention described in the summary of the invention is applied. That is, a blower comprising a blower main body and a casing covering the periphery and upper part of the blower, the blower main body comprising: a motor; a fan, which is fixed to the side opposite to the load of the rotating shaft; and a suction port and an air outlet located at the lower part of the fan, and the casing has: a storage chamber that houses the blower main body; an air intake a chamber, which is arranged adjacent to the side of the storage chamber close to the fan; a duct chamber, which is adjacent to the air inlet chamber, and accommodates a duct extending from the air outlet to the top of the box; and a sound-absorbing chamber and an exhaust chamber adjacent to the upper part of the storage chamber and the intake chamber.

effect of invention

According to one aspect of the present invention, it is possible to provide a blower capable of reducing noise from a blower main body and reducing temperature rise.

Other technical problems and effects of the present invention will become clear from the description below.

Description of drawings

FIG. 1 is an external perspective view of a blower according to Example 1 to which the present invention is applied.

Fig. 2 is a longitudinal sectional view of the blower according to the first embodiment to which the present invention is applied.

3 is an exploded perspective view of a part of the housing to which Example 1 of the present invention is applied.

FIG. 4 is a cross-sectional view of the blower of Embodiment 1 to which the present invention is applied.

FIG. 5 is an enlarged cross-sectional view of a case partition wall of Example 1 to which the present invention is applied.

FIG. 6 is an exploded perspective view of a case to which Example 1 of the present invention is applied.

7 is a longitudinal cross-sectional view of a case to which Example 1 of the present invention is applied.

Detailed ways

Example

FIG. 1 is a perspective view of a blower 1 to which Embodiment 1 of the present invention is applied, and FIG. 2 is a longitudinal cross-sectional view of a case 2 when viewed from the y-axis direction.

The blower 1 shown in FIG. 1 is composed of a case 2 having a box-shaped appearance, and a blower main body 3 (not shown) accommodated in the case 2 . Extending to the front in the x direction is an intake duct 301 extending from a blower main body 3 to be described later. The case 2 is provided with at least one (two in FIG. 1 ) ventilation ports 21 for switching the air between the inside and the outside. The ventilation port 21 may be provided as an opening, or a fine-mesh filter or the like may be further provided in the opening so that dust and the like do not enter the housing 2 . Next, the structures of the blower main body 3 and the casing 2 will be described with reference to FIGS. 2 to 4 .

As shown in FIG. 2 , the inside of the housing 2 is divided into a plurality of chambers (rooms) by partition walls. At the center are the blower main body 3 and the blower housing chamber 201 in which the blower main body 3 is accommodated.

The blower main body 3 includes an impeller portion and a motor portion that rotationally drives the impeller portion. 103 is a casing, and 101 is a motor that drives the impeller. One end of the boosting path in the casing is connected to the discharge port 105 via the discharge side passage, and the other end is connected to the intake port via the suction side passage. The discharge side passage and the suction side passage are arranged in parallel. The boosting path is formed in an annular shape with the rotation center of the impeller, that is, the rotation axis of the electric motor 101 as the center, and has a semicircular arc groove shape opened in a direction parallel to the rotation axis. Furthermore, a partition wall is provided between the discharge-side passage and the suction-side passage to cut off the boosting path, but it is not shown here. Numeral 104 is a cooling fan and a fan cover fixed to the side opposite to the impeller of the rotation shaft of the motor 101 . Cooling fins for cooling are provided in the motor 101 and the casing 103 .

The blower main body 3 is configured such that when the impeller is rotationally driven by the motor 101, gas is sucked from the suction port through the suction side passage by the action of the impeller, and the sucked gas is pressurized by the impeller and conveyed to the discharge side passage. The gas pressurized to a high pressure is discharged from the discharge port 105 through the discharge-side passage. On the other hand, by rotation of the motor 101 , the cooling fan 104 takes in air from the intake chamber 202 adjacent to the blower housing chamber 201 , blows the air along the cooling fins, and cools the motor 101 and the vicinity of the impeller of the casing 103 .

The outline of the case body 2 is formed in a box shape. 22 is a base part on which the blower main body 3 is arranged, and 24 is a caster for moving, and the casters are respectively provided under the base part 22 . In the base portion 22 where the blower main body 3 is provided, the base portion 22 is provided with a sound absorbing material 222 on the metal plate 220, and elastic members (not shown) such as rubber are provided at the position where the base portion 22 contacts the legs of the blower main body 3. This is to prevent the vibration when the blower 1 is moved by the casters 24 from being transmitted to the blower main body 3 . When the blower 1 is not moved after the blower 1 is installed, the casters 24 may not be provided.

A storage chamber 201 for accommodating the blower main body 3 is provided in the central part of the box body 2 , and an intake chamber 202 , a duct chamber 203 , a sound absorption chamber 204 and an exhaust chamber 205 are also provided in the box body 2 , wherein the intake chamber is 202 is arranged adjacent to the side opposite to the load of the storage chamber 201, the duct chamber 203 is arranged adjacent to the side opposite to the load of the intake chamber 202, and the sound absorption chamber 204 and the exhaust chamber 205 are adjacent to the side of the storage chamber 201. Adjacent to the top.

As shown in FIG. 3 , the air taken into the blower main body 3 from the outside of the box 2 through the air inlet duct 301 and the air inlet is compressed in the blower, and discharged to the air of the blower main body 3 through the air outlet 105 and the air outlet duct 302 external. The exhaust duct 302 is connected to the exhaust chamber 205 provided in the upper part of the storage chamber 201 . The air in the exhaust chamber 205 is discharged to the outside of the case from the ventilation port 21 provided in the case 2 . The sound-absorbing chamber 204 has a connection port connected to the ventilation port 21 and the intake chamber 202 , and the air sucked by the cooling fan 104 is sent to the storage chamber 201 from the outside of the case 2 through the side of the sound-absorbing chamber 204 . In this way, the blower main body 3 can be efficiently cooled by separating the chamber and the ventilation port so that the exhaust air from the high temperature blower main body 3 and the intake air for cooling the blower main body 3 do not mix.

FIG. 4 shows a cross-sectional view of the case 2 viewed from the z direction. 4 is a control part which controls the electric motor 101, and is comprised by an inverter etc. FIG. 401 is a cover for mounting the control unit. When the control unit 4 is directly attached to the outer wall of the storage chamber 201 , there is a possibility of failure due to vibration or heat generation. Therefore, a structure in which the control unit is attached to the control unit cover 401 is adopted.

FIG. 5 is a schematic diagram showing a sound absorbing structure provided to a part of the partition wall of the box body 2 . The outer wall and the like of the box body 2 are constituted by the metal plate 220 , and the partition wall has a sound absorption structure in which a mesh metal member 221 and a sound absorption material 222 are combined. The mesh metal member 221 is provided with a plurality of circles having prescribed intervals and prescribed diameters to reduce sound of prescribed frequencies, and the mesh metal member 221 has a mesh-like appearance. For example, it may be composed of punched metal or the like. As the sound absorbing material, a porous material through which air can pass, such as urethane, can be used.

The frequency (resonance frequency) at which sound can be absorbed by the mesh metal plate 221 can be obtained by the following formula 1.

(Formula 1)

Here, c is the speed of sound, p is the aperture ratio of the mesh metal plate 221 , t is the plate thickness of the mesh metal plate 221 , and d is the diameter of a circle provided in the mesh metal plate 221 . Lc is the thickness of the air layer behind, and in this embodiment, is the distance from the mesh metal plate 221 to the metal plate 220 on the outer wall of the box. For example, in the case of the mesh metal plate 221 provided between the storage chamber 201 and the intake chamber 202 , Lc is the length of the intake chamber 202 in the x direction.

The noise generated by the blower main body 3 includes sounds of various wavelengths from loud sounds to small sounds, and therefore, has a plurality of frequency peaks. Therefore, the cabinet 2 is designed by adjusting p, t, d, and Lc of (Equation 1), so as to have a structure capable of absorbing sound in a desired frequency band. In this way, most of the noise generated from the blower main body 3 can be eliminated.

FIG. 6 is an exploded perspective view of the sound absorbing structure of the cabinet 2 , and FIG. 7 is a cross-sectional view. Since the source of noise is the blower main body 3 , the mesh metal plate 221 is provided as a partition wall covering the periphery of the blower main body 3 . Specifically, it is the partition between the intake chamber 202 and the storage chamber 201 , and the partition between the storage chamber 201 and the anechoic chamber 204 . In order to further improve the sound absorption effect, as shown in FIG. 2 , a partition wall 210 may be provided on the load side of the blower main body 3 in the storage chamber 201 . In this case, the partition wall 210 is composed of the mesh-shaped metal plate 221 and the sound absorbing material 222 . Alternatively, the partition wall between the duct chamber 203 and the air inlet chamber 202 may also be a mesh metal plate 221 .

Next, a sound absorbing material 222 is provided between the mesh metal plate 221 and the noise source. In the present embodiment, the sound absorbing material 222 is attached to the surface of the mesh metal plate 221 on the side of the storage chamber. By providing the structure which exhibits the sound absorbing effect in the partition wall of the cabinet 2 in this way, the sound absorbing performance of the cabinet 2 can be improved. In order to further improve the sound absorption effect. As shown in the figure, the entire portion other than the surface of the mesh metal plate 221 may be covered with the sound absorbing material 222 . By adopting such a structure, it can be comprised so that the frequency|frequency of a loud noise among the frequencies of a noise is absorbed by the mesh metal plate 221, and the noise frequency other than that can be absorbed by the sound absorbing material 222.

As described above, in the blower 1 described in this embodiment, by extending the exhaust duct to the upper part of the storage chamber, the blower exhaust gas can be prevented from entering the intake air of the cooling fan, and the blower main body can be effectively cooled. Therefore, even if the partition structure in which Helmholtz sound absorbing and sound absorbing of the sound absorbing material coexist is adopted, the temperature of the blower main body 3 does not rise excessively, and it is possible to drive at a low temperature and safely.

This invention is not limited to the structure demonstrated in this Example, It can apply to the blower of various forms.

Explanation of reference numerals

1: Blower

101: Electric motor

103: Housing

104: Cooling Fan

105: Exhaust port

2: Box

21: Ventilation port

22: Base part

24: Casters

201: Storage Room

202: Intake Chamber

203: Plumbing Room

204: Acoustic Room

210: Next door (ie, partition)

220: Sheet Metal

221: Mesh Metal Plate

222: Sound Absorbing Materials

3: Blower body

301: Intake duct

302: Exhaust pipe

4: Control Department

401: Control unit cover.

Claims (6)

1. a blower is characterized in that: It includes a blower main body and a box covering the periphery and upper part of the blower, The blower body includes: electric motor; A blade for a blower, which is fixed to the load side of the rotating shaft of the electric motor; a fan fixed to the side of the rotating shaft opposite the load; and The suction port and blowout port located at the lower part of the fan, The box has: a storage room, which accommodates the blower body; an air intake chamber, which is arranged adjacent to the side of the storage chamber close to the fan; a duct chamber which is adjacent to the intake chamber and accommodates a duct extending from the blower outlet to a position above the storage chamber; and A sound absorption chamber and an exhaust chamber are adjacent to the upper parts of the storage chamber and the intake chamber. 2. blower according to claim 1, is characterized in that: Among the partition walls of the box body, the partition wall between the storage chamber and the intake chamber and the partition wall between the storage chamber and the anechoic chamber include mesh metal plates. 3. blower according to claim 2, is characterized in that: A sound absorbing material is provided on the surface on the side of the storage chamber among the surfaces of the mesh metal plate in the box. 4. A casing for a blower, comprising: a storage chamber, which houses the blower; an air intake chamber, which is arranged adjacent to the side of the storage chamber close to the fan; a duct chamber which is adjacent to the intake chamber and accommodates a duct extending from the blower outlet to a position above the storage chamber; and A sound absorption chamber and an exhaust chamber are adjacent to the upper parts of the storage chamber and the intake chamber. 5. The casing for blower according to claim 4 is characterized in that: Among the partition walls, the partition wall between the storage chamber and the air inlet chamber and the partition wall between the storage chamber and the anechoic chamber include mesh metal plates. 6. The fan box according to claim 5, characterized in that: A sound absorbing material is provided on the surface of the mesh metal plate on the side of the storage chamber.

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