JPS62190332A - Ceiling embedded type air conditioner - Google Patents

Abstract

PURPOSE:To be able to produce much air quantity with low noise by keeping the ratio of a distance covered from the inner circumferential part of a heat exchanger placed in a ring shape to the peripheral part of a blower fan to a distance covered from the peripheral part of the exchanger to the inner part of an air duct. CONSTITUTION:A distance R2 covered from the center of a fan 2 to the inner circumferential part of an air duct part 4b is fixed by the outer size of an air circuit, and the size R1 of the fan 2 and the width (the number of rows) t of a heat exchanger 3 are fixed by a necessary exchanger capacity. Therefore, free consideration points left in design lie only in the determination of a distance l1 covered from the periphery of the fan 2 to the inner part and a distance l2 covered from the periphery of the exchanger 3 to the inner surface of an air duct part 4b (l1+l2 is constant). When the distance l1 and l2 are changed in the condition that air blasting quantity (heat exchanger capacity) is constant, the change in noise value becomes lowest on condition that a l1/l2 ratio is put in the range of 1.25-1.6. Under that condition, an air conditioner is able to be operated and the reduction of noise is possible.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an improvement in the ventilation circuit of a ceiling-embedded air conditioner.

BACKGROUND OF THE INVENTION In recent years, demand for ceiling-mounted air conditioners, in which the indoor unit is installed in the ceiling, has been rapidly increasing due to the trend towards space saving.

An example of the above-mentioned conventional ceiling-embedded air conditioner will be described below with reference to the drawings.

FIG. 3 is a longitudinal sectional view of the ceiling-embedded air conditioner, and FIG. 4 is a sectional view taken along line V-17 in FIG. 3.

In the figure, an indoor unit main body A is formed in a circular shape, and inside it includes a fan morph 1 and a fan 2, a heat exchanger 3 arranged annularly around these, a water receiving part 4a, and a wind body part 4b. A wind cylinder 4 is provided which is integrally equipped with the following. Reference numeral 5 denotes a main body outer member, which is composed of an outer circumferential portion 5a and an outer top surface 5b.

Reference numeral 6 denotes an air guide for intake air, which supports the wind barrel 4 by means of hanging bolts 7 and screws 8 suspended from the outer top surface 5b. Furthermore, a fixing part 9c of a panel 9 having an air suction part 9a at the center and a Suita port 9b at the periphery is fitted into this screw 8, and the panel 9 is also fixed.

In the above configuration, when the air conditioner is operated, the fan 2 rotates, air is sucked in from the air suction part 9a of the panel 9, and is heat-exchanged by the heat exchanger 3 through the fan 2.
The wind () descends along the direction b and is blown out from the air outlet 9c of the panel 9.

Problems to be Solved by the Invention In recent years, there has been a trend toward space saving in air conditioners, and restrictions on the external dimension a have become particularly severe.

Along with this, the current situation is that the wind circuit is also determined from the external dimensions, but conventionally in this type of air conditioner, from the outer periphery of the fan 2 to the inner periphery of the heat exchanger 3, which has an important influence on the characteristics of the wind circuit. The optimal relationship between the distance 11 at the section and the distance 12 from the outer periphery of the heat exchanger 3 to the inner periphery of the wind body 4b has not been sufficiently studied, and as a result, the noise during air blowing is high and the air blowing amount is low. The problem was that it was not possible to secure a sufficient number of people.

In view of the above problems, the present invention provides an air conditioner with low noise and high air volume by improving the wind circuit.

Means for Solving the Problems In order to solve the above problems, the present invention provides a distance 11 from the outer circumference of the fan of the blower to the inner circumference of the heat exchanger and from the outer circumference of the heat exchanger to the outer circumference of the wind barrel. The distance between 25 and 1, and the ratio of 6r2 is within the range of 1.

Function: With the above configuration, the present invention can realize low noise force and high air volume during air blowing.

EXAMPLE Hereinafter, a ceiling-embedded air conditioner according to an example of the present invention will be described with reference to the drawings.

Since the basic configuration of this embodiment is the same as that shown in FIGS. 3 and 4, the explanation of the configuration F3A will be omitted and its operation will be explained.

FIG. 3 is a sectional view of the main part of the wind circuit. Air sucked in from the air suction part 9a of the panel 9 is heat-exchanged along the air guider 6 through the fan 2 and in the heat exchanger 3. , and is blown out from the outlet 9b.

As mentioned above, the distance R2 from the central force of the fan 2 to the inner circumferential surface of the wind body 4b is determined by the external dimensions, and the size R1 of the fan 2 and the distance R2 of the heat exchanger 3 are determined by the required heat exchanger capacity. The width (number of columns) t is also determined.

Therefore, the only design considerations that remain open are the distance 11 from the outer periphery of the fan 2 to the inner periphery of the heat exchanger 3, and the distance 11 from the outer periphery of the heat exchanger 3 to the inner surface of the wind barrel 4b'! T: distance a12
(j?1 +12 'ri constant) To fx le.

Figure 2 is a graph showing the change in noise value when changing 11 and e2 while keeping the air flow rate (heat exchanger capacity) constant.The horizontal axis shows the ratio 11/12, and the vertical axis shows the noise value in dB. This is what I took.

As is clear from the figure, a low noise region occurs when the value of 21/12 is l;>1.6. Breath like this, 2
If the ratio of 5 to 1.6 11/12 is set in the range of 4 mm, the air conditioner can be operated at the lowest noise value when the air flow rate is constant, and noise can be reduced.

Effects of the Invention As is clear from the above embodiments, the present invention has the following advantages: the distance 11 from the inner periphery of the heat exchanger arranged annularly around the blower to the outer periphery 1 of the fan of the blower, and the outer periphery of the heat exchanger. By setting the distance l2 from the inner peripheral part 1 of the wind barrel to the ratio z5 to 1.6, it is easy to achieve high air volume and low noise in a ceiling-mounted air conditioner. It has excellent effects that can be achieved.

[Brief explanation of drawings]

Fig. 1 is a sectional view of essential parts of a ceiling-embedded air conditioner according to an embodiment of the present invention, Fig. 2 is a characteristic diagram for limiting the arrangement range of the heat exchanger in the air conditioner, and Fig. 3 4 is a vertical cross-sectional view of a general ceiling-embedded air conditioner including the present invention.
The figure is a sectional view taken along the line v--■ in FIG. 3. 1...Fan motor, 2...Fan,
3...Heat exchanger, 4...Wind barrel, 4a.
...Water receiving part, 4b...Wind body part, l...
...Distance from the inner circumference of the heat exchanger to the outer circumference of 7 am,
12... Distance from the outer periphery of the heat exchanger to the inner periphery of the wind cylinder, A... Indoor unit main body. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure 2-1-Buduno 3--A-dokoro-buton-ri Nagidou 5" t 4q---1r
- Air Group Diagram 2 M° ”°” “, b JJ
ノ/2゜1---77/Sake? --- 77/ J----1 treatment device 4-ichishimaso 4a--yK missing chip p 4υ-- & month t] 11♂ σ-44 outside elongation feather 6--1 air n Ig 7--1 Hanging Sohon I)-

Claims (1)

[Claims] An indoor unit main body that has a heat exchanger arranged in a substantially annular shape around a blower, a wind barrel that integrally includes a water tray for the heat exchanger, and that forms a wind circuit, and a main body outer member configured in a concentric circle. , a hanging fitting provided to extend downward from the upper part of the outer body of the indoor unit, and a panel part supported by the lower end of the hanging fitting, and the indoor unit is configured from a fan outer peripheral part of the blower. A ceiling-embedded air conditioner in which the ratio of the distance l_1 to the inner periphery of the heat exchanger and the distance l_2 from the outer periphery of the heat exchanger to the inner periphery of the wind barrel is in the range of 1.25 to 1.6.