JP2014149095A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner capable of suppressing increase of air blow noise caused by shape of a vertical wind direction plate, and a distance between the vertical wind direction plate and a fan guard.SOLUTION: An air outlet is provided with a lateral wind direction plate, a fan guard, a first vertical wind direction plate 24a and a second vertical wind direction plate, successively disposed from an upstream side. An upstream-side tip portion of the first vertical wind direction plate 24a is provided with a planar portion 241. A ratio of a length dimension Th of the planar portion to a thickness dimension T in the first vertical wind direction plate 24a (Th/T) is preferably 50% or more, and a distance L between the vertical wind direction plate and the fan guard is preferably 10 mm or more and 17 mm or less.

Description

  The present invention relates to an air conditioner, and more particularly to an air conditioner including a fan guard at an outlet of an indoor unit.

  2. Description of the Related Art Conventionally, an air conditioner is known in which a fan guard is provided at an air outlet in order to prevent fingers from entering the indoor unit from the air outlet of the indoor unit (see, for example, Patent Document 1). . In the air conditioner described in Patent Document 1, upper and lower air deflected up and down from the air outlet to the air outlet that is provided in the lower front of the indoor unit casing and is formed in a rectangular shape that is long in the left-right direction. It is equipped with a wind direction plate and a left and right wind direction plate that deflects left and right, a left and right wind direction plate on the upstream side (inside the indoor unit) of the air outlet, and a vertical wind direction plate on the downstream side (indoor side) of the air outlet, Each is arranged. And the fan guard is arrange | positioned between the left-right wind direction board and the up-down wind direction board. For example, the fan guard is formed in a lattice shape by welding a plurality of vertical rails made of iron wire having a thickness of about 1 mm and a horizontal rail, and the distance between adjacent horizontal rails is such that human fingers cannot enter. Has been.

JP-A-10-132318

  FIG. 2B is an enlarged view of a main part for explaining the positional relationship between the upper and lower wind direction plates and the fan guard in the above-described conventional air conditioner indoor unit, and 24b is a sectional shape on the upstream side of the upper and lower wind direction plates. , 32 is a horizontal beam of the fan guard, W is air blown out from the outlet (in FIG. 2 (B), the air flowing speed is connected at a substantially constant speed, and the air flowing direction is indicated by an arrow. L represents the distance when the upstream end of the rotating vertical wind direction plate 24b is closest to the horizontal beam 32 of the fan guard. In consideration of the fact that the upstream end of the up-and-down air direction plate 24b becomes the resistance of the air W blown from the outlet, the distance L is determined by the up-and-down air direction plate 24b when the air conditioner is stopped. It is a dimension in consideration of moving and closing the air outlet, and the distance L is usually 20 mm or more.

  Further, as shown in FIG. 2B, the upstream cross-sectional shape of the up-and-down airflow direction plate 24b is formed so that the tip becomes narrower toward the upstream side so as not to increase the resistance to the flow of air W. The length dimension Th2 of the flat surface portion 242 (surface substantially perpendicular to the flow of the air W) at the upstream end of the up-and-down air direction plate 24b is set to about 30% with respect to the thickness dimension T of the up-and-down air direction plate 24b. .

  On the other hand, in recent years, downsizing of indoor units has been required in consideration of the design and installation properties of indoor units, and in order to reduce the depth and height of indoor units, the distance L is set to be smaller than 20 mm. There is. However, if the distance L is smaller than 20 mm when the upstream side shape of the vertical wind direction plate 24b is formed to become narrower toward the upstream side as described above, depending on the angle of the vertical wind direction plate 24b, Like the region S surrounded by the broken line in FIG. 2 (B), the flow of the air W blown out from the air outlet may be concentrated on the upper surface of the up / down airflow direction plate 24b. As a result, in the region S, the flow rate of the air W is increased and the air flow speed (flow velocity) is increased. As a result, the wind noise generated in the vertical wind direction plate 24b is increased, and the blowing noise of the indoor unit is increased. There was a possibility that it would become large and uncomfortable for the user.

  The present invention solves the problems described above, and provides an air conditioner that can suppress an increase in blowing noise due to the shape of the vertical wind direction plate and the distance between the vertical wind direction plate and the fan guard. For the purpose.

  The present invention solves the above-described problem, and the air conditioner of the present invention has a suction port on the top surface of the indoor unit housing and a blower outlet at the lower front portion of the indoor unit housing, A blower fan is provided in the ventilation path connecting the blower outlet to suck indoor air from the suction port and blown out from the blower outlet, and the air blown from the blower outlet is arranged downstream of the blower fan. An up / down wind direction plate deflected in the up / down direction, and a fan guard disposed between the blower fan and the up / down wind direction plate are provided. And a plane part is provided in the edge part by the side of the ventilation fan in an up-and-down wind direction board, the distance of a plane part and a fan guard shall be 10 mm or more and 17 mm or less, and the length dimension of a plane part is the thickness of an up-and-down wind direction board. That is, 50% or more of the size.

  The air conditioner according to the present invention is provided with a flat portion at an end of the vertical airflow direction plate on the side of the blower fan, and the distance between the flat portion and the fan guard is set to 10 mm or more and 17 mm or less, and the length dimension of the flat portion is set. It is 50% or more of the thickness dimension of the vertical wind direction plate. Thereby, the wind noise generated by the vertical wind direction plate can be suppressed, and the blowing noise of the indoor unit can be suppressed.

It is explanatory drawing of the indoor unit of the air conditioner in embodiment of this invention, (A) is an external appearance perspective view, (B) is XX sectional drawing in (A). It is drawing explaining the positional relationship of an up-and-down wind direction board and a fan gart, (A) is the C section enlarged view in FIG.1 (B), (B) is an enlarged view of the same location as (A) in the conventional air conditioner. FIG. It is a correlation diagram with the distance of an up-and-down wind direction board and a fan gart, and a ventilation noise level.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. As an embodiment, an indoor unit of an air conditioner installed on a wall surface inside a house will be described as an example. The present invention is not limited to the following embodiments, and can be variously modified without departing from the gist of the present invention.

  As shown in FIG. 1 (A), the indoor unit 1 has an indoor unit housing 10 which is a main body housing having a horizontally long and substantially rectangular parallelepiped shape. A front panel 11 is provided on the front surface of the indoor unit housing 10 so as to be formed in a substantially square shape using a resin material so as to cover the front surface of the indoor unit housing 10 and to form a design surface of the indoor unit 1. It has been.

  The left and right side surfaces of the indoor unit housing 10 are formed by a right side panel 12 and a left side panel 13. Each of the right side panel 12 and the left side panel 13 is formed into a curved surface having a predetermined curvature using a resin material, and has a bilaterally symmetric shape.

  A suction port 14 for taking air into the indoor unit 1 is provided on the top surface of the indoor unit housing 10, and a resin material is used to cover the suction port 14 as shown in FIG. A suction grille 14a formed in a lattice shape is provided. A blower outlet 15 is provided below the front panel 11 for blowing out air that has been heat-exchanged with the refrigerant in the indoor unit 1 into the room.

  As shown in FIG. 1 (B), indoor air is sucked from the inlet 14 and blown out from the outlet 15 into the ventilation path 20 connecting the inlet 14 and the outlet 15 covered with the suction grill 14a. The blower fan 21 is provided, and an inverted V-shaped heat exchanger 22 is disposed above the blower fan 21. The blower fan 21 and the heat exchanger 22 are fixed to a base 16 for attaching the indoor unit 1 to a wall surface.

  Moreover, in order to remove dust contained in the air taken into the indoor unit 1 on the upstream side of the heat exchanger 22 in the ventilation path 20 (between the heat exchanger 22 and the front panel 11 and the suction grille 14). The filter 18 is arranged.

  The blower outlet 15 is formed by the lower part of the base 16 and the lower surface of the casing 17 attached to the front panel 2, and the blower outlet 15 is a first that deflects the air blown from the blower outlet 15 in the vertical direction. An up / down wind direction plate 24a and a second up / down wind direction plate 25 disposed below the first up / down wind direction plate 24a are provided. Further, the air blown from the blowout port 15 is deflected in the left-right direction on the upstream side of the blowout port 15 (inside the indoor unit housing 10) as viewed from the first vertical wind direction plate 24a and the second vertical wind direction plate 25. Left and right wind direction plates 23 are provided. The left and right wind direction plates 23, the first up and down wind direction plate 24a, and the second up and down wind direction plate 25 are each formed of a resin material.

  The first up-and-down air direction plate 24a and the second up-and-down air direction plate 25 are each fixed to a rotation shaft (not shown), and deflect the air blown from the outlet 15 in the up-down direction by rotating in the up-down direction. Moreover, the 1st up-and-down wind direction board 24a and the 2nd up-and-down wind direction board 25 are made into the shape which can block the blower outlet 15, when the indoor unit 1 has stopped driving | operation.

  Further, as shown in FIG. 2A, the shape of the upstream end portion of the first vertical wind direction plate 24a is made narrower toward the upstream side as in the conventional vertical wind direction plate 24b shown in FIG. 2B. Instead, the same thickness dimension T is set from the upstream end to the downstream end, and the first up-down airflow direction plate 24a is rotated at the angle shown in FIG. 2A at the upstream end. A flat surface portion 241 that is a surface that is substantially perpendicular to the flow of the wind W is sometimes formed. The length dimension Th1 of the plane portion 241 is larger than the length dimension Th2 of the plane portion 242 of the conventional vertical wind direction plate 24b. For example, the length of the plane portion 242 with respect to the thickness dimension T of the conventional vertical direction plate 24b. While the ratio of the thickness dimension Th2 (Th2 / T) is 30%, the ratio (Th1 / T) of the length dimension Th1 of the flat surface portion 241 to the thickness dimension T of the first vertical airflow direction plate 24a is 50%. Is done.

  Further, as shown in FIG. 1B, a fan guard 30 is disposed between the left and right wind direction plates 23, the first vertical wind direction plate 24a, and the second vertical wind direction plate 25. The fan guard 30 is configured by combining a plurality of vertical bars 31 and a plurality of horizontal bars 32 in a lattice shape. The vertical bars 31 and the horizontal bars 32 are, for example, iron wires having a predetermined thickness (for example, a diameter of 1 mm). It is formed using. The vertical rail 31 is bent so as to protrude toward the downstream side of the air outlet 15 so as to correspond to the shape of the left and right wind direction plates 23. Further, the horizontal rails 32 are arranged in the vertical direction at dimensional intervals that do not allow human fingers to enter.

  Next, referring to FIGS. 1 to 3, the distance between the first vertical wind direction plate 24 a and the fan guard 30 and the upstream shape of the first vertical wind direction plate 24 a in the present embodiment are generated at the air outlet 15. The influence on the blowing noise will be described.

  In the following description, the thickness dimension of the first vertical wind direction plate 24a and the conventional vertical wind direction plate 24b described above is T, the length dimension of the flat portion of the first vertical wind direction plate 24a is Th1, and the conventional vertical wind direction plate 24b is In addition to the length dimension of the flat surface portion: Th2 and the flow of wind blown from the air outlet 15, the flat surface portion 241 of the first vertical airflow direction plate 24a or the flat surface portion 242 of the conventional vertical airflow direction plate 24b and the fan guard A description will be given assuming that the distance from 30 (the horizontal beam 32) is L (unit: mm) and the blowing noise level generated at the outlet 15 is N (unit: dB) (see FIG. 2). The distance L is a distance when the flat surface portion 241 of the rotating first up / down air direction plate 24a or the flat surface portion 242 of the conventional up / down air direction plate 24b and the horizontal rail 32 of the fan guard 30 are closest to each other. .

  In addition, when individual reference is not necessary, the first vertical wind direction plate 24a and the conventional vertical wind direction plate 24b will be described as the vertical size of the vertical wind direction plate 24, and the length of the flat portion of the vertical wind direction plate 24 as Th. In addition, if no particular reference is required, the distance L between the flat portion 241 of the first vertical airflow direction plate 24a or the flat surface portion 242 of the conventional vertical airflow direction plate 24b and the fan guard 30 (the horizontal beam 32) is set as the vertical airflow direction plate. 24 and the distance L between the fan guard 30.

  FIG. 3 is a distance-blow noise level correlation diagram 100 showing the correlation between the distance L between the up / down airflow direction plate 24 and the fan guard 30 and the length dimension of the flat portion, and the blow noise level N at the air outlet 15. This distance-blower noise level correlation diagram 100 is measured by driving the blower fan 21 so that the wind speed of the air blown out from the blowout port 15 is 5.5 m / second, and the vertical axis indicates the blown noise level. N (42 dB to 51 dB), the horizontal axis is the distance L (8 mm to 27 mm) between the vertical wind direction plate 24 and the fan guard 30.

  Th / T indicates the ratio of the length dimension Th of the flat portion to the thickness dimension T of the up-and-down wind direction plate 24. In the distance-fan noise level correlation diagram 100, Th / T = 30%, 40 The relationship between the distance L and the blowing noise level N is shown for the cases of% and 50%.

  From the distance-blow noise level correlation diagram 100, the larger the Th / T, that is, the longer the length dimension Th of the flat surface portion of the up-and-down wind direction plate 24, the smaller the blow noise level N regardless of the distance L. The case where T = 50% is the smallest. Although illustration is omitted, if Th / T is 50% or more, the blowing noise level N is equal to or less than the blowing noise level N when Th / T = 50%. Further, the blowing noise level N when the distance L = 20 mm in the conventional up-and-down wind direction plate 24b (Th2 / T = 30%) is 45 dB, but the same in the first up-and-down wind direction plate 24a (Th1 / T = 50). The air blowing noise level N (= 45 dB) is when the distance L = 17 mm, and the distance L can be reduced by 3 mm compared to the case where the conventional up-and-down wind direction plate 24b is employed.

  When the distance L is 20 mm or more, the change rate of the blowing noise level N at each Th / T (the rate of change of the blowing noise level N accompanying the change of the distance L) is substantially the same, but the distance When L is less than 20 mm, the rate of change of the blowing noise level N at each Th / T is different. Especially when the distance L is 17 mm or less (a portion surrounded by a broken line in FIG. 3), Th / T = 50%. The change rate of the blowing noise level N is smaller than the change rate of the blowing noise level N when Th / T = 30% and 40%.

  For example, when the distance L is 17 mm, the blowing noise level N when Th / T = 30% is 46.2 dB, and the blowing noise level N when Th / T = 40% is 45.8 dB, Th / T = The blowing noise level N at 50% is 45.0 dB, and the blowing noise level N when Th / T is changed from 30% to 40% is reduced by 0.4 dB, whereas Th / T is reduced from 40%. The blowing noise level N at 50% is reduced by 0.8 dB. That is, the reduction of the blowing noise level N when the Th / T is changed from 40% to 50% is 0.4 dB larger than when the Th / T is changed from 30% to 40%. As is apparent from FIG. 3, the difference in the reduction rate of the blowing noise level N due to Th / T increases as the distance L becomes smaller than 17 mm.

  The reason for the difference in the rate of change of the blowing noise level N described above will be described with reference to FIG. In the conventional up / down wind direction plate 24b shown in FIG. 2B, the ratio (Th2 / T) of the length dimension Th2 of the plane portion 242 to the thickness dimension T of the up / down wind direction plate 24b is 30%. In this case, most of the wind W that has passed through the crosspiece 32 of the fan guard 30 and has reached the flat portion 242 of the up-and-down wind direction plate 24b is up and down when the up-and-down wind direction plate 24b has an angle shown in FIG. It flows to the upper side of the wind direction plate 24b. As a result, a region S having a large air flow rate is generated on the upper side of the vertical wind direction plate 24b, and a wind noise is generated on the upstream side of the vertical direction plate 24b due to an increase in the flow velocity of the air W in the region S. . The blowing noise level N increases due to the wind noise, and the air flow rate (air flow velocity) in the region S increases as the distance L approaches, so the rate of change of the blowing noise level N with respect to the change in the distance L increases.

  On the other hand, in the first vertical wind direction plate 24a in the present embodiment shown in FIG. 2 (A), the flat portion 241 is provided at the upstream end portion, and the plane with respect to the thickness dimension T of the first vertical wind direction plate 24a. The ratio (Th1 / T) of the length dimension Th1 of the portion 241 is 50%. When the first up-and-down wind direction plate 24a has the same angle as the above-described up-and-down wind direction plate 24b, the first up-and-down wind direction plate 24a passes through the horizontal rail 32 of the fan guard 30 and reaches the flat surface portion 241 of the first up-and-down air direction plate 24a. The amount of air flowing to the upper side of the first vertical wind direction plate 24a is smaller than that of the conventional vertical wind direction plate 24b. Therefore, the region S with a large air flow rate does not occur as in the case of the up-and-down wind direction plate 24b, and the level of wind noise generated on the upstream side of the first up-and-down wind direction plate 24a is compared with the case of the conventional up-and-down wind direction plate 24b. Will drop. As a result, the blowing noise level N is not increased as compared with the case of the conventional up-and-down wind direction plate 24b, and the rate of change of the blowing noise level N with respect to the change in the distance L is also reduced.

  From the above, the ratio of the length dimension Th of the plane portion to the thickness dimension T in the up-and-down wind direction plate 24: Th / T is preferably 50% or more. Moreover, it is preferable that the distance L between the up-and-down wind direction plate 24 and the fan guard 30 is 10 mm or more and 17 mm or less. Note that the distance L is set to 10 mm or more when the vertical wind direction plate 24 and the fan guard 30 are brought closer to each other. This is because the vertical wind direction plate 24 and the fan guard 30 may hit when the vertical wind direction plate 24 rotates due to an error or the like.

  As described above, the air conditioner of the present invention has a flat portion at the end of the up-and-down air direction plate 24 on the side of the blower fan 21, and the distance between the flat portion of the up-and-down air direction plate 24 and the fan guard 30 is 10 millimeters or more. The length dimension Th of the plane portion is 50% or more of the thickness dimension of the vertical wind direction plate 24. Thereby, the wind noise generated in the up-and-down wind direction plate 24 can be suppressed and the blowing noise of the indoor unit 1 can be suppressed.

  In the above-described embodiment, the case where the flat surface portion 241 is provided at the upstream end of the air outlet in the vertical air direction plate 24 has been described. However, the vertical air direction plate 24 is manufactured at both the upper and lower end portions of the flat surface portion 241. In consideration of circumstances (durability of the mold, prevention of occurrence of dents and scratches at both the upper and lower ends of the flat portion 241), chamfering or rounding (R (R)) without departing from the above effect ) May be provided.

DESCRIPTION OF SYMBOLS 1 Indoor unit 10 Indoor unit housing | casing 14 Suction port 15 Air outlet 16 Base 17 Casing 20 Ventilation path 21 Blower fan 24 Vertical wind direction plate 24a 1st vertical direction plate 24b Conventional vertical direction plate 241 Plane part 242 Plane part 30 Fan guard 31 Vertical beam 32 Horizontal beam T Thickness of vertical wind direction plate Th, Th1, Th2 Plane length length L Distance between vertical wind direction plate and fan guard W Wind

Claims (1)

Having a suction port on the top surface of the indoor unit housing and a blower outlet at the lower front of the indoor unit housing;
An air conditioner that is disposed in a ventilation path that connects the suction port and the air outlet, and includes a blower fan that sucks room air from the air inlet and blows it out from the air outlet,
An upper and lower airflow direction plate that is arranged on the downstream side of the blower fan and deflects the air blown from the air outlet in the vertical direction; and a fan guard disposed between the blower fan and the upper and lower airflow direction plate,
A flat portion is provided at an end of the up and down wind direction plate on the side of the blower fan,
The distance between the plane part and the fan guard is 10 mm or more and 17 mm or less, and the length dimension of the plane part is 50% or more of the thickness dimension of the up-and-down wind direction plate. Harmony machine

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