JP2014055557A - Blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blower used for a ceiling-embedded type ventilation fan and the like which is highly efficient.SOLUTION: In a housing 2, a blower comprises: an impeller 6 driven by an electric motor 5; a scroll casing 7 surrounding the periphery of the impeller 6; and an adapter 9 for connecting a housing air outlet 4 and a duct 8 at the outside of the housing 2. The scroll casing 7 comprises: a casing suction port 10 communicating with a housing suction port 3; and a casing air outlet 11 connected to the housing air outlet 4. The shape of the adapter 9, on a cross section of the adapter 9 perpendicular to an air flow direction, is configured in such a manner that the maximum value of a dimension Dh in a rotary shaft direction of the impeller 6 is shorter than the maximum value of a dimension Dw in a direction orthogonal to the rotary shaft direction. In the blower 1 which is embedded in a ceiling or in a wall and used, the shape of the cross section of the adapter 9 has a configuration in which the position where the dimension Dh becomes the maximum value is located 0.2Dw to 0.4Dw closer to a direction where the air speed of the air passing through the casing air outlet is faster than the position of the dimension Dw/2.

Description

  The present invention relates to a blower used for a ceiling-embedded ventilation fan or the like.

  Conventionally, a ceiling-embedded ventilation fan or the like is known as this type of blower (see, for example, Patent Document 1).

  Hereinafter, the blower will be described with reference to FIG.

  As shown in FIG. 4, the centrifugal blower 106 includes an outer shell 101 that is open on one surface, an electric motor 104 that has an impeller 103 fixed to the top surface 102 in the outer shell 101, and a casing 105 that surrounds the periphery of the impeller 103. The air outlet 107 of the casing 105 and the duct 108 are connected by a duct connection adapter 109 attached to the outer shell 101.

  In the above configuration, when the impeller 103 rotates, the intake air enters the impeller 103 from the casing 105 and is pressurized by the impeller 103, passes through the inside of the casing 105, and is exhausted from the duct 108 through the duct connection adapter 109 from the outlet 107. Is done.

JP-A-8-303831 (FIG. 1)

  In the centrifugal blower 106 using such a conventional duct connection adapter 109, the air flow generated by the impeller 103 has a uniform speed distribution when passing through the duct connection adapter 109 due to the influence of the rotation of the impeller 103. However, there was a problem of pressure loss.

  Therefore, the present invention solves the above-described conventional problems, and an object of the present invention is to provide an efficient blower that has a small variation in the wind speed distribution of air passing through an adapter.

  And in order to achieve this object, the present invention includes an impeller driven by an electric motor, a scroll casing surrounding the impeller, and a casing provided with a casing suction port and a casing outlet. An adapter for connecting the casing outlet and duct to the outside of the casing is provided, and the scroll casing includes a casing inlet connected to the casing inlet and a casing outlet connected to the casing outlet. The shape of the adapter is such that the maximum value of the dimension Dh in the rotation axis direction of the impeller is shorter than the maximum value of the dimension Dw in the direction orthogonal to the rotation axis direction in the cross section of the adapter perpendicular to the air flow direction. It is a substantially oval shape that is embedded in a ceiling or wall, and the adapter cross-sectional shape has a position where the dimension Dh is the maximum value than the position of the dimension Dw / 2. The air blower is characterized in that it has a position of 0.2 Dw to 0.4 Dw in the direction in which the wind speed of the air passing through the casing outlet is high, thereby achieving the intended purpose. .

  According to the present invention, in a casing having a casing suction port and a casing outlet, an impeller driven by an electric motor, a scroll casing surrounding the impeller, and the casing outside the casing. An adapter for connecting a body outlet and a duct; the scroll casing includes a casing inlet connected to the casing inlet; a casing outlet connected to the casing outlet; and the shape of the adapter is air In the cross section of the adapter perpendicular to the flow direction, the maximum value of the dimension Dh in the rotation axis direction of the impeller is substantially elliptical, which is shorter than the maximum value of the dimension Dw in the direction perpendicular to the rotation axis direction. In the blower used by being embedded in a ceiling or a wall, the shape of the cross section of the adapter passes through the casing outlet through the position where the dimension Dh is the maximum value than the position of the dimension Dw / 2. By adopting a configuration in which the air wind speed is set to a position of 0.2 Dw to 0.4 Dw in a direction in which the air speed is high, variation in the wind speed distribution passing through the adapter is reduced, so that the pressure loss is reduced and the efficiency is improved. Can be obtained.

The block diagram which shows the air blower of Embodiment 1 of this invention. The block diagram which shows the adapter of Embodiment 1 of this invention The block diagram which shows the air blower of Embodiment 2 of this invention. Configuration diagram showing an example of conventional technology

  According to a first aspect of the present invention, an air blower includes an impeller driven by an electric motor, a scroll casing surrounding the impeller, and a housing in a housing having a housing inlet and a housing outlet. An adapter for connecting the casing outlet and duct to the outside of the body, the scroll casing includes a casing inlet connected to the casing inlet, and a casing outlet connected to the casing outlet; The shape of the adapter is such that the maximum value of the dimension Dh in the rotation axis direction of the impeller is shorter than the maximum value of the dimension Dw in the direction orthogonal to the rotation axis direction in the adapter cross section perpendicular to the air flow direction. In the air blower used by being embedded in a ceiling or wall, the position where the adapter cross-section has the maximum value of the dimension Dh is more than the position of the dimension Dw / 2. It has a configuration in which the wind speed of the air passing through the grayed outlet is the position of 0.2Dw~0.4Dw the fast direction. Thereby, since the dispersion | variation in the wind speed distribution of the air which passes an adapter becomes small, there exists an effect that it becomes possible to improve efficiency.

  Moreover, you may make it the structure where the position of the dimension Dw / 2 of an adapter cross section was located in the direction where the wind speed of the air which passes the said casing blower outlet is quicker than the center of the said casing blower outlet. Thereby, since the adapter cross-sectional area in the direction in which the wind speed of the air passing through the casing outlet is high is increased, it is possible to reduce the pressure loss due to the adapter and improve the efficiency.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIG. 1, a blower 1 that is attached to a ceiling or a wall and used as an embedded ventilation fan to ventilate a space such as a bathroom or a toilet includes a housing suction port 3 and a housing air outlet 4. In addition, in a case 2 having a 260 mm square and a height of 85 mm, an impeller 6 having an outer diameter of 175 mm driven by the electric motor 5, a scroll casing 7 surrounding the impeller 6, and a case outside the case 2. An adapter 9 that connects the body outlet 4 and the duct 8 is provided, and the scroll casing 7 includes a casing inlet 10 that communicates with the casing inlet 3 and a casing outlet 11 that is connected to the casing outlet 4.

  The air sucked from the casing suction port 10 is pressurized by the impeller 6 and flows to the duct 8 through the casing outlet 11 and the adapter 9.

  As shown in FIG. 2, the opening shape of the adapter 9 on the duct 8 connection side is such that the maximum value of the dimension Dh in the rotation axis direction of the impeller 6 is perpendicular to the rotation axis direction in the adapter cross section perpendicular to the air flow direction. The adapter 9 has a substantially oval shape that is shorter than the maximum value of the dimension Dw in the direction in which the duct 9 is connected. When the duct 8 and the adapter 9 are connected, the duct 8 is crushed and connected in accordance with the outer shape of the adapter 9. In the opening shape on the duct 8 connection side, the position where the dimension Dh is the maximum value is a position shifted by Dx in the direction in which the wind speed of the air passing through the casing outlet 11 is faster than the position of the center of the dimension Dw.

  In the present embodiment, the shape of the opening of the adapter 9 on the duct 8 connection side is such that the maximum value of the dimension Dh is 63 mm and the dimension Dw is 124 mm, and the wind speed passing through the casing outlet 11 is determined by the scroll of the scroll casing 7. Since the wind speed on the starting position side is fast, the position where the dimension Dh is maximum is the position side where the scrolling starts from the center position of the dimension Dw, and Dx is 0.2 Dw, that is, about 25 mm.

  Here, from the wind speed distribution of the air passing through the casing outlet 11, the maximum value of the wind speed is within the range of Dx from 0.2 Dw to 0.4 Dw, and the position where the dimension Dh is maximum is also within this range.

  According to such a configuration, since the variation in the wind speed distribution of the air passing through the adapter 9 is reduced, the pressure loss is reduced and the efficiency can be improved.

  Furthermore, when the duct 8 is attached, the duct 8 is attached from the side having the maximum value of Dh to the side having no maximum value of Dh across Dw / 2, so that the opening on the duct 8 connection side of the adapter 9 The catching with the duct 8 can be reduced, and the duct 8 can be easily attached.

  In the present embodiment, the position of the maximum value of the dimension Dh is set to the position side where the scroll of the scroll casing 7 starts. However, when the wind speed on the side opposite to the position where the scroll starts is high, the position opposite to the position where the scroll starts. Alternatively, the maximum value of the dimension Dh may be positioned on the side to be processed.

(Embodiment 2)
3, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 3 shows a direction in which the position of the dimension Dw / 2 of the opening of the adapter 9 on the duct 8 connection side is higher in the wind speed of the air passing through the casing outlet 11 than the center position of the casing outlet 11 (broken line in the figure). It is a block diagram of the air blower 1 located in.

  In the present embodiment, since the wind speed of the air passing through the casing outlet 11 is higher at the position where the scroll of the scroll casing 7 starts to scroll, the position of the opening D on the duct 8 connection side of the adapter 9 is set to the casing outlet. 11 is located on the position side where scrolling starts from the center of 11.

  In the above configuration, since the cross-sectional area of the adapter 9 in the direction in which the wind speed of the air passing through the casing outlet 11 is high is increased, the pressure loss due to the adapter 9 can be reduced and the efficiency can be improved.

  In this embodiment, the position of the dimension Dw / 2 of the opening of the adapter 9 on the duct 8 connection side is the position side where the scroll of the scroll casing 7 starts, but the wind speed on the side facing the position where the scroll starts is fast. In such a case, a configuration may be adopted in which the dimension Dw / 2 of the opening of the adapter 9 on the duct 8 connection side is located on the side facing the position where the scroll starts.

  Since the blower according to the present invention enables high efficiency, it is useful as a blower used for a ceiling-embedded ventilation fan or the like.

DESCRIPTION OF SYMBOLS 1 Air blower 2 Housing | casing 3 Housing | casing suction port 4 Housing | casing blower outlet 5 Electric motor 6 Impeller 7 Scroll casing 8 Duct 9 Adapter 10 Casing suction port 11 Casing blower outlet 101 Outer 102 Top surface 103 Impeller 104 Electric motor 105 Casing 106 Centrifugal Blower 107 Outlet 108 Duct 109 Duct connection adapter

Claims (2)

In a housing having a housing suction port and a housing air outlet, an impeller driven by an electric motor, a scroll casing surrounding the periphery of the impeller, and the housing air outlet and a duct outside the housing It is an air blower that has an adapter to be connected and is embedded in the ceiling or wall.
The scroll casing is
A casing suction port communicating with the housing suction port, a casing air outlet connected to the housing air outlet,
The shape of the adapter is
In the adapter cross section perpendicular to the air flow direction, the maximum value of the dimension Dh in the rotation axis direction of the impeller is shorter than the maximum value of the dimension Dw in the direction orthogonal to the rotation axis direction. Yes,
The position of the cross section of the adapter is a position of 0.2 Dw to 0.4 Dw in a direction in which the wind speed of the air passing through the casing outlet is faster than the position of the dimension Dw / 2 at the position where the dimension Dh is the maximum value. A blower characterized by that. An air blower characterized in that the position of the adapter cross-section dimension Dw / 2 is located in a direction in which the wind speed of the air passing through the casing outlet is faster than the center of the casing outlet.

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