JPH06229578A - Ceiling recessed type indoor machine - Google Patents

Abstract

PURPOSE:To perform forced discharge of drain dripped from a heat-exchanger and to reduce the thickness of the whole of an indoor machine. CONSTITUTION:Drain 28 dripped to a place right below a heat-exchanger from a heat-exchanger 9 of an indoor machine 11 is collected by a subdrain pan 1 and further guided to a main drain pan 7, the drain being forcedly discharged with the aid of a drain pump. Further, a protrusion amount of the guide vane, located to the vicinity of the main drain pan 7, of a plurality of guide vanes 25 is decreased. The position of a V-shaped part 27 at the tip of the guide vane 25 is prevented from being lowered so much and the thickness of the whole of the indoor machine 11 is decreased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indoor unit for an air conditioner that cools or heats a room, and more particularly to an indoor unit having a sub-drain pan inside the indoor unit.

[0002]

2. Description of the Related Art As a conventional air conditioner indoor unit, a type that is embedded in a ceiling is known. This type of embedded type indoor unit has a casing, in which heat exchangers are arranged in a bracing manner, and a crossflow fan is provided on the upstream side of this heat exchanger and on the downstream side, that is, the suction side. An internal grill is provided on the passage side (for example, JP-A-3-45834).

This internal grill has guide blades, and the tips of the guide blades are bent upward in a substantially V-shape, and the V-shape portion forms a sub-drain pan.

The drain drained directly from the heat exchanger is collected in the sub-drain pan, and the drain flows into the main drain pan.

Considering the structure of the internal grill with reference to FIG. 10, when the vertical line is set up from the line L ₁ , the tips of the guide blades 25 are adjacent to each other from the viewpoint of reliably collecting the drain. It is desirable to match the root of 25,
From the viewpoint of reducing the suction resistance of air when a vertical line is set up from the line L _2, it is desirable to provide a sufficient suction space between the adjacent guide vanes 1.

[0006]

However, as shown in FIG.
With the shape shown in Fig. 5, in order to increase the size of the suction space projected on the line L ₂ , the length of the guide blade 25 is increased in order to match the line projected on the line L _1. Must. However, if this is made too long, the dimension H ₁ between the main drain pan 7 and the heat exchanger 9 must be increased. That is, since the drain received by the V-shaped portion of the guide blade 25 must be poured into the main drain pan 7, the V of the guide blade 25 at the bottom end is
This is because the character portion must always be above the main drain pan 7.

When the dimension H ₁ is increased as described above, the thickness of the entire indoor unit is increased, so that there is a problem that it is not possible to sufficiently meet the demand for a thin indoor unit.

The present invention has been made to solve the above problems, and it is possible to guide the drain collected in the sub-drain pan to the main drain pan and to reduce the overall thickness of the ceiling-embedded room. The purpose is to provide a machine.

[0009]

In order to achieve the above object, the present invention provides a heat exchanger arranged in a bracing manner in a casing, and a sub-drain pan arranged in a suction passage of the heat exchanger. In a ceiling-embedded indoor unit equipped with a plurality of guide blades that also function as the guide blades, each guide blade is formed so that the inclination becomes gentler as it approaches the heat exchanger, and the inclination is higher than that of the guide blades located at a higher position. The lower guide vanes are formed so as to be gentler.

[0010]

According to the present invention, the air sucked into the heat exchanger is guided by the guide vanes and sucked. Here, since each guide vane is formed so that the inclination thereof becomes gentle as it approaches the heat exchanger, the sucked air is efficiently sucked into the suction surface of the heat exchanger. Further, since the guide blades are formed so that the guide blades located at the lower position are more gradual in inclination than the guide blades located at the upper position, the amount of downward protrusion of the guide blade located at the lowest position is minimized. Since it can be suppressed, even if the position is set higher than the position of the main drain pan, the height of the entire indoor unit can be suppressed low.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic diagram of this embodiment, FIG. 2 is a detailed diagram,
3 to 9 are views showing the internal grill.

In FIG. 2, reference numeral 11 denotes an indoor unit, and this indoor unit 11 has a casing 13. The casing 13 has a thin, box-like shape, and is of a ceiling-embedded type in which the upper portion is embedded in the ceiling. In recent years, since the space above the ceiling of a building does not have sufficient space, the height of the ceiling above which it is mounted (dimension of the floor) is restricted, and a considerable reduction in thickness is required.

Inside the casing 13, heat exchangers 9 are arranged in a bracing manner. The heat exchanger 9 is provided with a tube 17 penetrating a large number of fins 15 arranged in parallel with each other, and the refrigerant flows through the inside of the tube 17. The tube 17 is made of copper, for example, and meanders so as to repeat the reciprocal movement in a direction perpendicular to the plane of the drawing. The heat exchanger 9 is inclined, and the inclination angle thereof becomes considerably smaller as the casing 13 becomes thinner.

A cross flow fan 19 is provided on the upper surface side of the heat exchanger 9 and sucks air 21 through the heat exchanger 9.

An internal grill 23 is provided on the lower surface side of the heat exchanger 9, that is, on the suction passage side. The inner grill 23 has guide blades 25 that also serve as three sub-drain pans 1 and
A sub-drain pan 26 is provided.

The guide vanes 25 have their vanes oriented in the direction of air flow, and their tips are bent in a substantially V-shape, and a V-shaped portion 27 for collecting the dripped drain is formed therein. Has been done. In addition, the base 29 of the three guide blades 25
The (portion near the heat exchanger) is bent so that the angle gradually becomes gentle in order to efficiently guide the air toward the cross flow fan 19. The sub-drain pan 26 formed near the upper end of the heat exchanger 9 is auxiliary and does not have a function of guiding air.

As shown in FIG. 1, the guide blade 25 adjacent to the tip of the guide blade 25 is located on the line projected on the line L _1.
It matches the base end of. According to this, even if the drain 28 drops from any part of the heat exchanger 9, the drain 28 can be reliably collected.

It is desirable that the air 21 sucked into the heat exchanger 9 passes between the respective guide vanes 25 and is finally collected between the heat exchanger 9 and the cross flow fan 19. Each of the guide vanes 25 of this embodiment is inclined at a predetermined angle so that the desired flow of the air 21 is smoothly formed.

That is, as shown in FIG. 2, the three guide blades 25 are provided obliquely downward toward the suction port 53 of the decorative panel 51, but the projecting directions thereof are slightly different. , Each guide vane 25 is adapted to create the most desirable air flow at each position.

Further, referring to FIG. 1, looking at the size of the suction space projected on the line L ₂ , according to this embodiment, even if the length of the guide blade 25 is not so long, The suction space can be wide. According to this, the air resistance of the sucked air 21 is small, and furthermore, the base portion 29 of the guide blade 25 finally guides the flow of the air 21 between the heat exchanger 9 and the cross flow fan 19. Is formed like this, the air 2
The air resistance of 1 is reduced.

The protrusion amounts of the three guide blades 25 are not equal, and the guide blade 25 closest to the main drain pan 7 is provided.
The amount of protrusion of is extremely small. Therefore, the position of the V-shaped portion 27 at the tip of the sub-drain pan 1 is gradually lowered as it approaches the main drain pan 7. However, the position of the sub drain pan 1 closest to the main drain pan 7 is not so low as compared with the conventional example (FIG. 10).

Both ends of each guide vane 25 are connected by side plates 31 to form an internal grill 23. The internal grill 23 has a central portion shown in FIGS.
As shown in, the partition wall 33 is formed. This partition 3
3 enhances the strength of the internal grill 23.

The shape of the V-shaped portion 27 of the sub-drain pan 1 is
The center of the inner grill 23 is slightly higher than both ends of the inner grill 23, creating a middle-high shape. Due to this middle-height shape, the collected drain flows along the longitudinal direction due to its own weight, and flows to the ends of the V-shaped portion 27, that is, both ends.

At both ends, as shown in FIGS.
A drain passage 35 is formed, and a bottom portion 37 of the drain passage 35 connects the V-shaped portion 27 of the sub-drain pan 1, which is gradually lowered, and the bottom portion 37 is substantially horizontal near the lower end. Therefore, the drain collected in the V-shaped portion 27 passes through the drain passage 35 and finally flows into the main drain pan 7. That is, the position of the main drain pan 7 is lower than the bottom portion 37 at the lower end of the drain passage 37.

The main drain pan 7 is provided with a drain pump (not shown). Further, a float switch 39 is provided to detect the water level of the main drain pan 7,
When the water level exceeds a certain level, it is considered that drainage by the drain pump has failed, and the operation of the indoor unit 11 is stopped.

The operation of the indoor unit 11 of this embodiment will be described below.

When the indoor unit 11 is operated, the air in the room is turned by the rotation of the cross flow fan 19 so that each guide vane 2
5 and is sucked in the direction between the heat exchanger 9 and the cross flow fan 19. Since the protruding direction of each guide vane 25 is set to an optimum angle, the flow of the air 21 draws a desirable smooth arc.

Further, the heat exchanger 9 and the cross flow fan 1
The air 21 sent between 9 and 9 is the cross flow fan 1
It is fully accelerated by the blades of 9 and cross flow fan 1
The ability of 9 is fully exerted, whereby sufficiently accelerated air is blown out from the air outlet 41.

The air 21 in the room is warm and moist, and when it is cooled, the temperature is lowered by the heat exchanger 9 and the water is drained.
8 and adhere to the surface of the heat exchanger 9. This drain 2
8 flows through the heat exchanger 9 or drops directly below. The drain 28 dropped right below is collected by the sub-drain pan 1.

The collected drain 28 flows through the bottom 37 of the drain passage 35 by its own weight and is guided to the main drain pan 7. The drain 28 introduced is discharged by a drain pump (not shown).

As described above, according to this embodiment,
Since the amount of protrusion of the guide vane 25 closest to the main drain pan 7 is small, the V-shaped portion 27 at the tip of the guide vane 25 is not so low. As a result, the drain passage 25
The lower end of is not so low, and the drain 28 can be guided to the main drain pan 7.

Therefore, as shown in FIG. 1, the heat exchanger 9
The position H ₂ of the main drain pan 7 relative to the lower end of
Since it can be made considerably smaller than the conventional example H ₁ shown in FIG. 10, the thickness of the indoor unit 11 can be made sufficiently thin.

Further, since the base portion 29 of the guide vane 25 is gently inclined, the flow of the air 21 is desired to be smooth, the suction resistance thereof can be reduced, and one guide vane 25 serves as a drain. Since the area that can be received is wider, the number of guide vanes 25 can be reduced (the prior art example of FIG. 10 has four blades and this embodiment has three blades), which also reduces the suction resistance. be able to.

By reducing the suction resistance in this way, the capacity of the indoor unit 11 can be increased,
The noise accompanying the intake of the air 21 can be reduced.

[0035]

As described above, according to the ceiling-embedded indoor unit of the present invention, each guide vane is formed so that its inclination becomes gentler as it approaches the heat exchanger.
Since the inclination is formed so as to be gentler in the lower guide blades than in the upper guide blades, the amount of protrusion of the guide blades can be suppressed and the indoor unit can be downsized.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention.

FIG. 2 is a sectional view of an air conditioner to which the present invention is applied.

FIG. 3 is a plan view of the internal grill of FIG. 2 as seen from the air suction direction.

FIG. 4 is a side view of FIG. 3 viewed from the right side in the figure.

5 is a cross-sectional view taken along the line AA of FIG.

6 is a view seen from one end of FIG. 3. FIG.

7 is a sectional view taken along line BB of FIG.

FIG. 8 is a sectional view taken along line CC of FIG.

9 is a view seen from an end portion in the opposite direction to FIG.

FIG. 10 is a schematic view showing a conventional problem of an indoor unit.

[Explanation of symbols]

 1 Sub-drain pan 7 Main drain pan 9 Heat exchanger 11 Indoor unit 13 Casing 19 Cross flow fan 23 Internal grill 25 Guide blade 26 Sub-drain pan 27 V-shaped part

Claims (1)

[Claims] 1. A ceiling-embedded indoor unit comprising a heat exchanger arranged in a bracing manner in a casing, and a plurality of guide vanes also functioning as sub-drain pans arranged in a suction passage of the heat exchanger, Each guide vane is formed so that the inclination becomes gentler as it approaches the heat exchanger, and the inclination is made so that the guide vanes located at the lower position are gentler than the guide vanes located at the upper position. A feature is a ceiling-embedded indoor unit.