JPH05196248A - Indoor unit for air-conditioner - Google Patents

Abstract

PURPOSE:To minimize the total pressure loss of a cross-flow fan in a condition that a heat exchanger is arranged at the suction side of the fan. CONSTITUTION:A heat exchanger 2 is arranged so that respective parts of respective surfaces 21, 22 at the inflow side and the outflow side of air in a heat exchanger 2 describe curved surfaces intersecting orthgonally to the flow directions of airstreams F generated in respective parts of the suction side by the rotation of a cross-flow fan 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indoor unit of an air conditioner in which a heat exchanger is arranged on the suction side of a cross flow fan.

[0002]

2. Description of the Related Art Conventionally, as an indoor unit of an air conditioner, there has been known one in which a heat exchanger 52 is arranged on the suction side of a cross flow fan 51 as shown in FIG. 189695). In such an indoor unit, it has been found that the flow direction of the air flow sucked into the gap between the blades 53, ... By the rotation of the cross flow fan 51 is different from the rotation direction of the fan. Therefore, if a heat exchanger 52 having flat surfaces on the air inflow side and the air outflow side is arranged on the suction side of the crossflow fan 51 as shown in the figure, the heat exchanger 52
Even if the thickness of the heat exchanger 52 is uniform throughout, the air flow passage distances at the various parts of the heat exchanger 52 are different, and
The air flow passes obliquely with respect to the thickness direction T of the heat exchanger 52 over almost the entire area of. F indicates the flow direction of the air flow.

[0003]

However, when the air flow passes obliquely with respect to the thickness direction T of the heat exchanger 52, the passing distance L1 becomes longer than the thickness T of the heat exchanger 52 as shown in FIG. Not only the pressure loss at the time of passage increases, but also the air flow suction characteristic of the cross flow fan 51 itself in FIG. 5 is impaired, so the energy loss Pt1 (total pressure loss) of the cross flow fan 51 increases, and the cross flow The heat exchanger 52 adversely affects the performance of the fan 51 itself,
According to the investigation, there is a problem that the performance of the cross flow fan 51 itself is impaired by about 15 to 20% by disposing the heat exchanger 52.

An indoor unit of an air conditioner capable of improving this point is described in Japanese Utility Model Laid-Open No. 3-13028.
This is one in which an arc-shaped heat exchanger having the same center as the rotation center of the cross flow fan is arranged on the suction side.

According to this indoor unit, the inflow angle A and the outflow angle B of the air flow F to the heat exchanger 52 shown in FIG. 4 are smaller than those of the indoor unit of FIG. 5, and the air flow F to the heat exchanger 52 is shown. The passing distance L1 of is shorter than that of FIG. Therefore, although it may contribute to the reduction of the total pressure loss Pt1 to some extent, it is the same as the case of the same figure in that the air flow passes obliquely with respect to the thickness direction T of the heat exchanger 52. However, the total pressure loss Pt1 cannot be suppressed to the minimum. Therefore, it was not sufficient to solve the above-mentioned problem that the heat exchanger 52 adversely affects the performance of the cross flow fan 51 itself.

The present invention has been made in view of the above circumstances, and makes the flow direction of the air flow in the heat exchanger the thickness direction of the heat exchanger without impairing the suction characteristic of the cross flow fan. Accordingly, it is an object of the present invention to provide an indoor unit of an air conditioner capable of suppressing the total pressure loss of a cross flow fan to a minimum.

[0007]

Therefore, the indoor unit of an air conditioner according to claim 1 is an indoor unit of an air conditioner in which a heat exchanger 2 is disposed on the suction side of a cross flow fan 1. The heat exchange is performed so that each part of the surfaces 21 and 22 on the air inflow side and the air outflow side in 2 draws a curved surface perpendicular to the flow direction of the air flow F generated in each part on the suction side by the rotation of the crossflow fan 1. The container 2 is provided.

The indoor unit of the air conditioner according to a second aspect of the invention is characterized in that the heat exchanger 2 is a mesh fin type heat exchanger 2.

[0009]

According to the indoor unit of the air conditioner of the first aspect, the flow direction of the air flow F generated in each part on the suction side by the rotation of the crossflow fan 1 is not changed,
The air flow F passes through each part of the heat exchanger 2 in the thickness direction.

In the indoor unit of the air conditioner according to the second aspect, the molding work can be easily performed.

[0011]

1 is an explanatory view of an indoor unit of an air conditioner according to an embodiment of the present invention. In the figure, 1 is a cross-flow fan, 2 is a heat exchanger arranged on the suction side of the cross-flow fan 1, 3 is a front grill, 5 is an outlet, and 6
Is a scroll.

In this indoor unit, the heat exchanger 2 is arranged on the suction side of the cross flow fan 1. And this heat exchanger 2 has each part a1 of the surface 21 on the air inflow side.
~ Q1 and each part a2 to q2 of the surface 22 on the air outflow side intersects perpendicularly with the flow direction of the ideal air flow F generated in each part on the suction side by the rotation of the crossflow fan 1 (the rotation direction is indicated by reference symbol R). It is arranged to draw a curved surface. In other words, the flow direction of the air flow F coincides with the flow direction of the air flow generated by the rotation of the cross flow fan 1 when the heat exchanger 2 is not arranged, and That is, the heat exchanger 2 is arranged in such a manner that the flow direction of the air flow is not changed.

With this configuration, the cross flow fan 1
The rotation of the air flow F does not change the flow direction of the air flow F generated in each part on the suction side, and the air flow F passes through each part of the heat exchanger 2 in its thickness direction, and as a result,
The pressure loss when the airflow F passes through the inside of the heat exchanger 2 is minimized, and the deterioration of the performance of the crossflow fan 1 due to the heat exchanger 2 is suppressed to the minimum.

Here, the respective parts on the suction side of the crossflow fan 1 are respective extremely narrow parts forming the suction region, and the respective parts a1 to q1 of the surface 21 on the air inflow side of the heat exchanger 2 are defined. , A2 to q2 of the surface 22 on the air outflow side in the heat exchanger 2 are the extremely narrow portions forming the surface 21 on the air outflow side. Each of the parts.

By forming the surfaces 21 and 22 on the air inflow side and the air outflow side of the heat exchanger 2 into curved surfaces, respective parts a1 to q of the surfaces 21 and 22 are formed.
It is technically difficult to cross 1, a2 to q2 exactly perpendicular to the flow direction of the air flow F. Therefore, the word "vertical" here is used not only in the case of being exactly vertical but also in the sense of including an angle approximating to vertical.
From this meaning, when the cross-sectional shape of the blade 3 is an arc like the cross-flow fan 1 shown in FIG. 2, the tangent line C of the blade 3 and the surface 21 of the air inlet side of the heat exchanger 2 and the air The respective intersecting angles A1, B with the surface 22 on the outflow side
By determining the curvature of the curved surface so that 1 is a right angle or a substantially right angle, the respective portions a1 to q of the surfaces 21 and 22 on the air inflow side and the air outflow side of the heat exchanger 2 are defined.
The condition that 1 and a2 to q2 intersect perpendicularly to the flow direction of the airflow F is satisfied. In FIG. 2, C1 indicates a tangent line of the rotation path at the tip of the blade 3, and the above-mentioned tangent line C of the blade 3 is generally in the range of α = 20 to 50 degrees with respect to the tangent line C1 of the rotation path at the tip of the blade 3. And leans outwards. Further, there is a mesh fin type heat exchanger as the heat exchanger 2 which can easily form each part of the surface 21 on the air inflow side and the surface 22 on the air outflow side into a curved surface having an arbitrary curvature.

In the above-described embodiment, the inflow angle A and the outflow angle B of the air flow F with respect to the heat exchanger 2 shown in FIG. The passage distance L2 becomes equal to the thickness of the heat exchanger 2, and the flow direction of the air flow F is in the flow direction of the air flow generated by the rotation of the crossflow fan when the heat exchanger 2 is not provided. Since they match, the total pressure loss Pt of the cross flow fan becomes the minimum. The total pressure loss Pt of this cross flow fan is represented by Pt = (L2 / L1) × Pt1.

[0017]

According to the indoor unit of the air conditioner of the first aspect of the present invention, each part of the surface on the air inflow side and the surface on the air outflow side of the heat exchanger is generated in each part on the suction side by the rotation of the crossflow fan. Since the heat exchanger is arranged so as to draw a curved surface that intersects perpendicularly to the flow direction of the flow, the flow of the air flow generated by the rotation of the crossflow fan when the heat exchanger is not arranged on the suction side. Since the direction does not change and the air flow passes through the heat exchanger in the thickness direction and the pressure loss at the time of passage is minimized, the total pressure loss is minimized and the crossflow by the heat exchanger is minimized. There is an effect that the deterioration of the performance of the fan is suppressed to a minimum and the performance of the indoor unit can be significantly improved.

Further, in the indoor unit of the air conditioner according to the second aspect, the molding work can be easily performed.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an indoor unit of an air conditioner according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a crossing angle between a tangent line of a blade and each side surface of a heat exchanger in a cross flow fan.

FIG. 3 is an explanatory diagram showing a passage distance of an air flow to a heat exchanger according to the present invention.

FIG. 4 is an explanatory diagram showing a passage distance of an airflow with respect to a heat exchanger in a conventional example.

FIG. 5 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 1 Cross Flow Fan 2 Heat Exchanger 21 Air Inflow Side Surface of Heat Exchanger 22 Air Outflow Side Surface of Heat Exchanger F Air Flow

Claims (2)

[Claims] 1. An indoor unit of an air conditioner in which a heat exchanger (2) is arranged on a suction side of a cross flow fan (1), wherein each of an air inflow side and an air outflow side of the heat exchanger (2). The heat exchanger (2) such that each part of the surface (21) (22) of the drawing draws a curved surface perpendicular to the flow direction of the air flow (F) generated in each part on the suction side by the rotation of the crossflow fan (1). An indoor unit of an air conditioner, characterized in that 2. The indoor unit of an air conditioner according to claim 1, wherein the heat exchanger (2) is a mesh fin type heat exchanger (2).