CN111852907A

CN111852907A - Blower and blower case

Info

Publication number: CN111852907A
Application number: CN202010165423.4A
Authority: CN
Inventors: 伊藤朋生
Original assignee: Hitachi Industrial Equipment Systems Co Ltd
Current assignee: Hitachi Industrial Equipment Systems Co Ltd
Priority date: 2019-04-26
Filing date: 2020-03-11
Publication date: 2020-10-30
Also published as: TWI748372B; TW202040009A; JP7353788B2; JP2020180591A

Abstract

The invention provides a blower and a blower case, which have improved sound absorption effect and good cooling efficiency. The air blower includes the air blower main part and covers the box on all around and the upper portion of air blower, the air blower main part includes: an electric motor; a blower blade fixed to a load-bearing side of a rotating shaft of the motor; a fan fixed to the side of the rotating shaft opposite to the load; and a suction port and a discharge port located below the fan, the casing having: a housing chamber that houses the blower main body; an air inlet chamber provided adjacent to a side of the storage chamber closer to the fan; a duct chamber adjacent to the intake chamber and accommodating a duct extending from the air outlet to a position above the accommodating chamber; and a sound absorbing chamber and an exhaust chamber adjacent to upper portions of the housing chamber and the intake chamber.

Description

Blower and blower case

Technical Field

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

Background

The vortex fan is configured such that an annular flow path from the suction port to the discharge port is formed by a fan casing provided so as to face the impeller, and gas is sucked from the suction port by the rotational motion of the impeller driven by the motor to be pressurized in the flow path.

In recent years, with the increasing demands for reduction in size and weight, increase in discharge pressure, reduction in noise, and the like of blowers, various studies and developments have been made on the structure and shape of the impeller. Meanwhile, a case for housing them is also required to be small, light, and sound deadening.

As described above, for noise reduction of the blower, for example, patent document 1 discloses a silencer device in which the blower is housed. The silencer has a casing with sound absorbing material adhered to it, which covers the blower and includes a silencing passage and a silencing pipe for absorbing noise from the blower.

Documents of the prior art

Patent document

Patent document 1: japanese unexamined patent publication Hei 10-220390

Disclosure of Invention

Technical problem to be solved by the invention

Compared with patent document 1, there is a technical problem that the noise reduction effect is improved while further reducing the weight. In order to solve such a problem, a Helmholtz (Helmholtz) sound absorption technique is known in which a metal is provided with a plurality of holes to absorb sound in a specific frequency range.

However, since helmholtz sound absorption absorbs only sound of a specific frequency, even if applied to a muffler device to absorb a frequency that becomes a peak of noise, other frequencies cannot be absorbed. Then, the inventors of the present invention have studied whether the sound-deadening effect can be improved by using the sound-deadening material such as urethane that has been conventionally used. As a result, although the noise reduction effect can be improved, the thermal conductivity of the urethane material is low, and therefore, a new problem arises in that the temperature in the case rises.

The invention aims to provide a blower with a silencing device which can improve the silencing effect and prevent the temperature from rising.

Technical solution for solving technical problem

In order to solve the above-described problems, for example, the inventions described in the summary of the invention are applied. Namely, a blower including a blower main body and a case covering the periphery and upper portion of the blower, the blower main body comprising: an electric motor; a blower blade fixed to a load-bearing side of a rotating shaft of the motor; a fan fixed to the side of the rotating shaft opposite to the load; and a suction port and a discharge port located below the fan, the casing having: a housing chamber that houses the blower main body; an air inlet chamber provided adjacent to a side of the storage chamber closer to the fan; a duct chamber adjacent to the intake chamber and accommodating a duct extending from the air outlet to a top of the box body; and a sound absorbing chamber and an exhaust chamber adjacent to upper portions of the housing chamber and the intake chamber.

ADVANTAGEOUS EFFECTS OF INVENTION

According to an 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 apparent from the following description.

Drawings

Fig. 1 is an external perspective view of a blower to which embodiment 1 of the present invention is applied.

Fig. 2 is a longitudinal sectional view of a blower to which embodiment 1 of the present invention is applied.

Fig. 3 is a partially exploded perspective view of a case to which embodiment 1 of the present invention is applied.

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

Fig. 5 is an enlarged sectional view of a box partition wall to which embodiment 1 of the present invention is applied.

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

FIG. 7 is a longitudinal sectional view of a tank to which embodiment 1 of the present invention is applied.

Detailed Description

Examples

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 sectional view of a casing 2 as viewed from the y-axis direction.

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

As shown in fig. 2, the inside of the case 2 is partitioned into a plurality of chambers (rooms) by partition walls. Located at the center are the blower main body 3 and a blower housing chamber 201 housing the blower main body 3.

The blower main body 3 includes an impeller portion and a motor portion for rotationally driving the impeller portion. Reference numeral 103 denotes a housing, and 101 denotes a motor for driving an impeller. One end of the pressure raising path in the casing is connected to the discharge port 105 via a discharge-side passage, and the other end is connected to the intake port via an intake-side passage. The discharge-side passage and the suction-side passage are arranged in parallel. The pressure increasing path is formed in an annular shape around the rotation center of the impeller, that is, the rotation shaft of the motor 101, and has a semicircular arc-shaped groove shape in cross section that opens in a direction parallel to the rotation shaft. A partition is provided between the discharge-side passage and the suction-side passage to block the pressure raising path, but this is not illustrated. Reference numeral 104 denotes a cooling fan and a fan cover fixed to the side of the rotation shaft of the motor 101 opposite to the impeller. Cooling fins for cooling are provided in the motor 101 and the housing 103.

When the impeller is rotationally driven by the motor 101, the blower main body 3 is configured to suck gas from the suction port through the suction-side passage by the action of the impeller, pressurize the sucked gas by the impeller, and convey the gas 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, the cooling fan 104 takes in air from the air intake chamber 202 adjacent to the blower housing chamber 201 by the rotation of the motor 101, and blows the air along the cooling fins to cool the motor 101 and the vicinity of the impeller of the housing 103.

The general outline of the case 2 is formed in a box shape. Reference numeral 22 denotes a base portion on which the blower main body 3 is disposed, and 24 denotes casters for movement, which are respectively provided under the base portion 22. In the base part 22, at the portion where the blower main body 3 is provided, the base part 22 is provided with a sound absorbing material 222 laid on the metal plate 220, and an elastic member (not shown) such as rubber is provided at a position in contact with the leg portion of the blower main body 3. This is to prevent vibrations when the blower 1 is moved by the caster 24 from being transmitted to the blower main body 3. When the blower 1 is not moved after the blower 1 is installed, the caster 24 may not be provided.

A housing chamber 201 for housing the blower main body 3 is provided in the central portion of the housing 2, and an intake chamber 202, a duct chamber 203, a sound absorbing chamber 204, and an exhaust chamber 205 are provided in the housing 2, wherein the intake chamber 202 is provided adjacent to the housing chamber 201 on the side opposite to the load, the duct chamber 203 is provided adjacent to the intake chamber 202 on the side opposite to the load, and the sound absorbing chamber 204 and the exhaust chamber 205 are provided adjacent to the upper portion of the housing chamber 201.

As shown in fig. 3, air taken into the blower main body 3 from outside the casing 2 through the intake duct 301 and the intake port is compressed in the blower, and is discharged to the outside of the blower main body 3 through the exhaust port 105 and the exhaust duct 302. The exhaust duct 302 is connected to the exhaust chamber 205 provided in the upper portion of the housing chamber 201. The air in the exhaust chamber 205 is exhausted from the ventilation port 21 provided in the casing 2 to the outside of the casing. The sound absorption chamber 204 has a connection port connected to the ventilation port 21 and the intake chamber 202, and the gas sucked by the cooling fan 104 is sent from the outside of the casing 2 to the storage chamber 201 through the sound absorption chamber 204 side. By separating the chamber and the ventilation port so that the exhaust air from the blower main body 3 having a high temperature and the intake air for cooling the blower main body 3 do not mix, the blower main body 3 can be cooled efficiently.

Fig. 4 shows a cross-sectional view of the case 2 viewed from the z direction. Reference numeral 4 denotes a control unit for controlling the motor 101, and is constituted by an inverter and the like. 401 is a cover for mounting the control section. Since a failure may occur due to vibration or heat generation when the control unit 4 is directly attached to the outer wall of the storage chamber 201, the control unit is attached to the control unit cover 401.

Fig. 5 is a schematic view showing a sound absorbing structure provided to a part of a partition wall of the casing 2. The outer wall of the casing 2 and the like are formed of a metal plate 220, and the partition walls have a sound absorbing structure in which a mesh-like metal member 221 and a sound absorbing material 222 are combined. The mesh-shaped metal member 221 is provided with a plurality of circles having a predetermined interval and a predetermined diameter to reduce sound of a predetermined frequency, and the mesh-shaped metal member 221 has a mesh-shaped appearance. For example, the metal plate may be formed of a punched metal (punched metal) or the like. As the sound absorbing material, a porous material that can pass air, 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 expression 1.

(formula 1)

Here, c is the sound velocity, p is the aperture ratio of the mesh-like metal plate 221, t is the plate thickness of the mesh-like metal plate 221, and d is the diameter of the circle provided on the mesh-like metal plate 221. Lc is the thickness of the air layer behind, and in this embodiment, is the distance from the mesh-like metal plate 221 to the metal plate 220 on the outer wall of the case. For example, in the case of the mesh-shaped 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 a large sound to a small sound, and therefore has peaks of a plurality of frequencies. Therefore, the case 2 is designed by adjusting p, t, d, and Lc of (equation 1), and is configured to absorb 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 casing 2, and fig. 7 is a sectional view. Since the source of noise is the blower main body 3, the mesh-like metal plate 221 is provided as a partition wall covering the periphery of the blower main body 3. Specifically, the partition wall is provided between the intake chamber 202 and the storage chamber 201, and the partition wall is provided between the storage chamber 201 and the sound deadening chamber 204. In order to further improve the sound absorption effect, partition wall 210 may be provided on the load side of blower main body 3 in storage chamber 201, as shown in fig. 2. In this case, the partition wall 210 is composed of a mesh metal plate 221 and a sound absorbing material 222. Or the partition wall between the duct chamber 203 and the intake chamber 202 may be made of a mesh-like metal plate 221.

Next, a sound absorbing material 222 is provided between the mesh metal plate 221 and the noise source. In this embodiment, the sound absorbing material 222 is attached to a surface of the mesh-like metal plate 221 on the side of the storage chamber. By providing the partition wall of the casing 2 with a structure exhibiting a sound absorbing effect in this way, the sound absorbing performance of the casing 2 can be improved. In order to further improve the sound absorption effect. As shown in the figure, the entire area of the mesh-like metal plate 221 other than the surface may be covered with the sound absorbing material 222. With this configuration, the frequencies of loud noise among the frequencies of noise can be absorbed by the mesh-like metal plate 221, and other frequencies of noise can be absorbed by the sound absorbing material 222.

As described above, in the blower 1 according to the present embodiment, the exhaust duct extends to the upper portion of the storage chamber, so that the blower exhaust air does not enter the intake air of the cooling fan, and the blower main body can be cooled efficiently. Therefore, even if the partition wall structure in which the helmholtz sound absorption and the sound absorption of the sound absorbing material are combined is adopted, the temperature of the blower main body 3 does not excessively rise, and the blower main body can be driven safely at a low temperature.

The present invention is not limited to the structure described in the present embodiment, and can be applied to blowers of various types.

Description of reference numerals

1: blower fan

101: electric motor

103: shell body

104: cooling fan

105: exhaust port

2: box body

21: ventilation opening

22: base part

24: caster wheel

201: storage chamber

202: air inlet chamber

203: pipeline chamber

204: sound absorbing chamber

210: next door (i.e., partition wall)

220: metal plate

221: net-shaped metal plate

222: sound absorbing material

3: blower main body

301: air inlet pipeline

302: exhaust pipe

4: control unit

401: and a control part cover.

Claims

1. A blower, characterized by:

comprises a blower main body and a box body which covers the periphery and the upper part of the blower,

the blower main body includes:

An electric motor;

a blower blade fixed to a load-bearing side of a rotating shaft of the motor;

a fan fixed to the side of the rotating shaft opposite to the load; and

a suction port and a blowing port which are positioned at the lower part of the fan,

the box body is provided with:

a housing chamber that houses the blower main body;

an air inlet chamber provided adjacent to a side of the storage chamber closer to the fan;

a duct chamber adjacent to the intake chamber and accommodating a duct extending from the air outlet to a position above the accommodating chamber; and

a sound absorbing chamber and an exhaust chamber adjacent to the upper portions of the housing chamber and the intake chamber.

2. The blower according to claim 1, wherein:

among the partition walls of the case, the partition wall between the storage chamber and the intake chamber and the partition wall between the storage chamber and the muffling chamber include a mesh-shaped metal plate.

3. The blower according to claim 2, wherein:

a sound absorbing material is provided on a surface of the mesh-like metal plate in the case, the surface being closer to the storage chamber.

4. A cabinet for a blower, comprising:

a storage chamber that stores the blower;

5. The cabinet for a blower according to claim 4, wherein:

the partition wall between the storage chamber and the intake chamber and the partition wall between the storage chamber and the sound-deadening chamber among the partition walls include a mesh-shaped metal plate.

6. The box for fan according to claim 5, characterized in that:

a sound absorbing material is provided on a surface of the mesh-like metal plate on the side of the storage chamber.