JP2010096365A - Air-conditioning indoor unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air-conditioning indoor unit preventing stagnation of dew condensate in a duct in the air-conditioning indoor unit leading humidified air inside through the duct. <P>SOLUTION: The air-conditioning indoor unit 2 includes an internal duct 16 and a draining part 17 to allow the humidified air to flow to an air-conditioning object space after leading the humidified air generated outside, into a predetermined internal space. The internal duct 16 carries the humidified air taken inside, to the predetermined space. The draining part 17 is provided inside the internal duct 16 and has a dew condensate collecting part 18 and a drain part 19. The dew condensate collecting part 18 collects dew condensate produced in contact with the humidified air, and the drain part 19 drains water collected by the dew condensate collecting part 18. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an air conditioning indoor unit, and more particularly, to an air conditioning indoor unit that introduces humidified air into the inside through a duct.

  In recent years, air-conditioning indoor units having a humidifying function have been widely used (see, for example, Patent Document 1). In the air conditioning indoor unit described in Patent Document 1, high-temperature and high-humidity air generated outside is conveyed to the air-conditioning indoor unit through a duct.

However, in the configuration as described above, a part of the high-temperature and high-humidity air may condense on the inner wall surface of the duct and accumulate in the middle of the duct. If the condensed water accumulates in the duct of the air conditioning indoor unit, the condensed water Is likely to scatter in the room.
JP 2006-17396 A

  An object of the present invention is to provide an air conditioning indoor unit that introduces humidified air into the inside by a duct, and that prevents the condensed water from accumulating in the duct.

  An air conditioning indoor unit according to a first aspect of the present invention is an air conditioning indoor unit that introduces humidified air generated outside into a predetermined space inside and then flows the humidified air to a space to be air conditioned. And. The internal duct conveys humidified air taken inside to a predetermined space. The drainage part is provided in the internal duct, and has a condensed water collecting part and a drainage part. The dew condensation water collecting unit collects dew condensation water generated by contact with the humidified air. The drainage unit discharges the water collected in the condensed water collecting unit.

  In this air conditioning indoor unit, even when moisture in the humidified air is condensed in the internal duct, it is excluded as condensed water, so that water droplets are prevented from scattering into the air conditioning target space.

  The air conditioning indoor unit pertaining to the second invention is the air conditioning indoor unit pertaining to the first invention, wherein the drainage section includes a drainage channel and a drainage channel opening / closing member. The drainage channel is formed at the bottom of the condensed water collecting part. The drainage channel opening and closing member opens and closes the drainage channel in response to the amount of condensed water collected in the condensed water collecting unit.

  In this air conditioner indoor unit, since the drainage channel is closed when no condensed water is collected, the drainage channel is prevented from being blocked by small animals such as foreign matter and insects when not in use.

  An air conditioning indoor unit according to a third aspect of the present invention is the air conditioning indoor unit according to the second aspect of the present invention, wherein the drainage channel opening / closing member is a float valve that rises with condensed water and opens the drainage channel. In this air conditioner indoor unit, the drainage channel can be opened and closed only by buoyancy caused by condensed water, so an electric motor is not required and it is inexpensive.

  An air conditioning indoor unit according to a fourth aspect of the present invention is the air conditioning indoor unit according to any one of the first to third aspects of the present invention, wherein the air inlet for sucking air from below, the indoor heat exchanger, and the indoor heat exchanger And a drain pan which is disposed below. The indoor heat exchanger exchanges heat between the air sucked from the suction port and the refrigerant circulating inside. The drainage unit discharges the condensed water collected in the condensed water collecting unit to the drain pan. In this air-conditioning indoor unit, the drain pan is also used as a drainage destination of the water drainage portion, so that space is saved.

  The air conditioning indoor unit pertaining to the fifth aspect of the present invention is the air conditioning indoor unit pertaining to the fourth aspect of the present invention, wherein humidified air is introduced into the space between the inlet and the indoor heat exchanger. In this air conditioning indoor unit, the humidified air passes through the indoor heat exchanger together with the air sucked from the suction port, so that the temperature-controlled humidified air is blown into the air-conditioning target space, and comfort is improved.

  In the air conditioning indoor unit pertaining to the first aspect of the invention, even when moisture in the humidified air is condensed in the internal duct, it is excluded as condensed water, so that water droplets are prevented from scattering into the air conditioning target space.

  In the air conditioning indoor unit pertaining to the second aspect of the invention, since the drainage channel is closed when no condensed water is collected, the drainage channel is prevented from being blocked by small animals such as foreign matter and insects when not in use. The

  In the air conditioning indoor unit according to the third aspect of the invention, the drainage channel can be opened / closed only by buoyancy caused by condensed water, so that an electric motor is not required and is inexpensive.

  In the air conditioning indoor unit pertaining to the fourth aspect of the invention, the drain pan is also used as a drainage destination for the drainage portion, saving space.

  In the air conditioning indoor unit pertaining to the fifth aspect of the invention, the humidified air passes through the indoor heat exchanger together with the air sucked from the suction port, so that the temperature-controlled humidified air is blown into the air-conditioned space, improving comfort. .

  Embodiments of the present invention will be described below with reference to the drawings. The following embodiments are specific examples of the present invention and do not limit the technical scope of the present invention.

<Configuration of air conditioner>
FIG. 1 is a schematic configuration diagram of an air conditioner using an air conditioning indoor unit according to an embodiment of the present invention. The air conditioner 1 performs air conditioning in a room such as a building by a vapor compression refrigeration cycle operation. The air conditioner 1 mainly includes an air-conditioning outdoor unit 3 as a heat source unit and an air-conditioning indoor unit 2 as a utilization unit connected in parallel thereto. The refrigerant circuit 10 is configured by connecting the air conditioner outdoor unit 3, the air conditioner indoor unit 2, and the refrigerant communication pipe.

<Air conditioning indoor unit 2>
The air conditioning indoor unit 2 is installed by being embedded or suspended in a ceiling of a room such as a building, and has an indoor expansion valve 11 and an indoor heat exchanger 12. The indoor expansion valve 11 is an electric expansion valve, and is connected to the liquid side of the indoor heat exchanger 12. The indoor heat exchanger 12 is a cross fin type fin-and-tube heat exchanger composed of heat transfer tubes and a large number of fins, and serves as a refrigerant evaporator during cooling operation to cool indoor air. During the heating operation, it becomes a refrigerant condenser and heats indoor air.

<Air-conditioning outdoor unit 3>
The air conditioning outdoor unit 3 is installed outside a building or the like, and includes a compressor 31, a four-way switching valve 32, an outdoor heat exchanger 33, and an outdoor expansion valve 34. The compressor 31 is an inverter compressor whose capacity can be changed by rotation speed control.

  The four-way switching valve 32 is a valve that switches the direction of refrigerant flow. During the cooling operation, the discharge side of the compressor 31 and the gas side of the outdoor heat exchanger 33 are connected, and the gas side of the indoor heat exchanger 12 and the suction side of the compressor 31 are connected (four-way switching in FIG. 1). (See solid line for valve 32). Further, during the heating operation, the discharge side of the compressor 31 and the gas side of the indoor heat exchanger 12 are connected, and the suction side of the compressor 31 and the gas side of the outdoor heat exchanger 33 are connected (four in FIG. 1). (Refer to the broken line of the path switching valve 32).

  The outdoor heat exchanger 33 is a cross fin type fin-and-tube heat exchanger composed of heat transfer tubes and a large number of fins. The outdoor heat exchanger 33 serves as a refrigerant condenser during the cooling operation and serves as a refrigerant evaporator during the heating operation. It becomes.

  The outdoor expansion valve 34 is an electric expansion valve, and is connected between the outdoor heat exchanger 33 and the indoor expansion valve 11 in order to adjust the pressure, flow rate, and the like of the refrigerant flowing in the refrigerant circuit 10 on the outdoor side. The

<Humidification unit>
The humidification unit 5 is arranged outdoors together with the air conditioning outdoor unit 3, generates humid air using moisture captured from the outside air, and sends the humid air into the air conditioning indoor unit 2 through the duct 6.

<Operation of air conditioner>
(Cooling operation)
During the cooling operation, the four-way switching valve 32 is in the state shown by the solid line in FIG. 1, the discharge side of the compressor 31 is connected to the gas side of the outdoor heat exchanger 33, and the suction side of the compressor 31 is indoor heat exchange. The gas is connected to the gas side of the vessel 12. The outdoor expansion valve 34 is open.

  In this state, when the compressor 31 is started, the high-temperature and high-pressure gas refrigerant discharged from the compressor 31 is introduced into the outdoor heat exchanger 33. The gas refrigerant exchanges heat with outdoor air in the outdoor heat exchanger 33 and condenses to become a high-temperature and high-pressure liquid refrigerant toward the indoor expansion valve 11. The high-temperature and high-pressure liquid refrigerant is decompressed by the indoor expansion valve 11 to become a low-temperature and low-pressure gas-liquid two-phase refrigerant and enters the indoor heat exchanger 12. This gas-liquid two-phase refrigerant exchanges heat with indoor air in the indoor heat exchanger 12 to become a gas refrigerant, and is sucked into the compressor 31 again.

(Heating operation)
During the heating operation, the four-way switching valve 32 is in the state indicated by the broken line in FIG. 1, the discharge side of the compressor 31 is connected to the gas side of the indoor heat exchanger 12, and the suction side of the compressor 31 is the outdoor heat exchanger 33. The gas side is contacted. The degree of opening of the outdoor expansion valve 34 is adjusted to reduce the refrigerant going to the outdoor heat exchanger 33 to an evaporation pressure at which the refrigerant can evaporate in the outdoor heat exchanger 33. Further, the indoor expansion valve 11 is opened.

  In this state, when the compressor 31 is started, the high-temperature and high-pressure gas refrigerant discharged from the compressor 31 is introduced into the indoor heat exchanger 12. The gas refrigerant is condensed by exchanging heat with indoor air in the indoor heat exchanger 12 to become a high-temperature and high-pressure liquid refrigerant. The liquid refrigerant that has exited the indoor heat exchanger 12 is decompressed by the outdoor expansion valve 34 to become a low-temperature / low-pressure gas-liquid two-phase refrigerant, and enters the outdoor heat exchanger 33. The gas-liquid two-phase refrigerant exchanges heat with outdoor air in the outdoor heat exchanger 33 to become a gas refrigerant, and is sucked into the compressor 31 again.

  Note that humid air is introduced into the air-conditioned indoor unit 2 according to the indoor humidity set by the user regardless of the cooling operation or the heating operation.

<Configuration of air conditioning indoor unit 2>
FIG. 2 is an external perspective view of an air conditioning indoor unit according to an embodiment of the present invention. In FIG. 2, the air conditioning indoor unit 2 includes a main body 20 having a suction port 20a and a blower outlet 20b on a lower surface, a panel 24 attached to the suction port 20a, and a first wind direction adjusting blade 52 that opens and closes the blower outlet 20b. ing. The suction port 20a and the air outlet 20b are adjacent to each other with a certain distance therebetween, so that a phenomenon in which air blown from the air outlet 20b is sucked into the air inlet 20a, that is, a so-called short circuit does not occur. The lower surface of the main body 20 is covered with a decorative panel 21, and it is the decorative panel 21 that is actually exposed to the ceiling surface. The outlines of the suction port 20 a and the air outlet 20 b are formed by the decorative panel 21.

  FIG. 3 is a cross-sectional view of the air conditioning indoor unit along line AA in FIG. 2. In FIG. 3, the air conditioning indoor unit 2 includes a filter 9, an indoor heat exchanger 12, a fan 13, and a drain pan 14. During the operation of the air conditioning indoor unit 2, the air outlet 20b is opened, the fan 13 is rotated, air is sucked in from the air inlet 20a, and is blown out from the air outlet 20b. The panel 24 has a plurality of ventilation holes 24a through which air passes.

(Filter 9)
As shown in FIG. 3, the filter 9 is disposed on the front side of the indoor heat exchanger 12 and removes dust from the air taken in from the room. Thereby, the filter 9 prevents the surface of the indoor heat exchanger 12 from being contaminated by dust floating in the air.

(Indoor heat exchanger 12)
In FIG. 3, the indoor heat exchanger 12 has two heat exchangers adjacent to each other in different inclined postures, with the upper heat exchanger serving as the upper heat exchanger 12a and the lower heat exchanger serving as the lower heat. This is called the exchanger 12b. The upper heat exchanger 12a is set to 45 ° to 65 ° (preferably 55 °) with respect to the horizontal line. The inclination angle of the lower heat exchanger 12b is less than 45 ° with respect to the horizontal line.

(Fan 13)
The fan 13 is a cross-flow fan, has a width dimension longer than the diameter, and sucks air from the direction perpendicular to the rotation axis. Therefore, the fan 13 sucks air from the single suction port 20a and blows it out to the single air outlet 20b. be able to. The air that has entered through the suction port 20 a passes through the filter 9 and the indoor heat exchanger 12 and is sucked into the fan 13. The air blown out from the fan 13 goes out from the air outlet 20b.

  The 1st wind direction adjustment blade | wing 52 is arrange | positioned at the blower outlet 20b. The first wind direction adjusting blade 52 can be adjusted in inclination angle by a motor. When the operation is stopped, the first wind direction adjusting blade 52 closes the outlet 20b.

(Drain pan 14)
The drain pan 14 is disposed below the lower end surface of the upper heat exchanger 12a and the lower surface of the lower heat exchanger 12b. Since the dew condensation water generated on the surface of the upper heat exchanger 12a always descends to the lower end surface, the drain pan 14 does not need to be disposed below the upper heat exchanger 12a.

(Internal duct 16)
4 is a cross-sectional view of the air-conditioning indoor unit taken along line BB in FIG. In FIG. 4, an internal duct 16 for introducing humidified air is disposed near the side wall of the air conditioning indoor unit 2. The internal duct 16 has an introduction part 16a, an intermediate part 16b, and an exhaust part 16c.

  The inlet 161 of the introduction part 16a protrudes outside through the side wall of the air conditioning indoor unit 2, and the duct 6 is connected thereto. The outlet 162 of the introduction part 16a is connected to the intermediate part 16b. The intermediate part 16b has a space for convection of the humid air that has passed through the introduction part 16a. In the intermediate part 16 b, a part of the moisture contained in the humidified air is condensed and collected in the lower part, and the accumulated condensed water is drained to the drain pan 14. The inlet of the exhaust part 16 c is connected to the intermediate part 16 b, and the outlet 164 of the exhaust part 16 c is arranged so as to be close to the side surface of the filter 9.

  FIG. 5 is a front view of the internal duct. In FIG. 5, the internal duct 16 is made of resin, and the introduction part 16a, the intermediate part 16b, and the exhaust part 16c can be separated. In addition, each of the introduction part 16a, the intermediate part 16b, and the exhaust part 16c can be divided into two parts.

  For example, the introduction portion 16 a has a cylindrical shape having a straight portion and a curved portion, but a part of the straight portion and the curved portion can be divided in the radial direction by the snap fit structure 165. Although the intermediate part 16b is a rectangular parallelepiped shape, it can be divided | segmented into the left-right direction of FIG. The exhaust portion 16c has a rectangular tube shape in cross section, but can be divided by the snap-fit structure 165 in the front-rear direction of the front view of FIG.

  A seal member 166 is provided in the vicinity of the inlet 161 of the introduction portion 16a. The seal member 166 is used to close a gap generated when the introduction portion 16a penetrates the side wall of the air conditioning indoor unit 2.

  6 is a cross-sectional view of the internal duct taken along line CC in FIG. In FIG. 6, the outlet 162 of the introduction part 16a is connected to face the inner bottom surface of the intermediate part 16b. The inlet 163 of the exhaust part 16c is connected to a position at a certain distance from the outlet 162 of the introduction part 16a, and the direction intersects with the direction of the outlet 162 of the introduction part 16a at approximately 90 °.

  A partition wall 167 is provided between the outlet 162 of the introduction part 16a and the inlet 163 of the exhaust part 16c. The height of the partition wall 167 is about half the height of the inlet 163 of the exhaust part 16c. Therefore, the humidified air that has exited from the outlet 162 of the introduction portion 16a proceeds toward the inner bottom surface of the intermediate portion 16b, and then rises along the partition wall 167 to reach the inlet 163 of the exhaust portion 16c.

  The humidified air is high-temperature and high-humidity air, and a portion of moisture is condensed on the inner wall surface of the intermediate portion 16b while reaching the inlet 163 of the exhaust portion 16c from the outlet 162 of the introduction portion 16a. The condensed water descends due to gravity and accumulates at the bottom. A drainage portion 17 is provided at the bottom of the intermediate portion 16b. The drainage unit 17 includes a condensed water collecting unit 18 and a drainage unit 19.

  The drainage unit 19 includes a drainage channel 191 that passes through the bottom of the condensed water collecting unit 18 and communicates with the outside, and a float valve 192 that opens and closes the drainage channel 191. The float valve 192 is lifted by the condensed water collected in the condensed water collecting unit 18, and when the height of the lift exceeds a predetermined height, the drainage channel 191 is opened, and the condensed water flows from the drainage channel 191 to the drain pan 14. Discharged.

<Features>
(1)
In the air conditioning indoor unit 2, even when moisture in the humidified air is condensed in the internal duct 16, the condensed water is collected in the condensed water collecting unit 18. The collected condensed water floats up the float valve 192 to open the drainage channel 191 and flows out to the drain pan 14. As a result, the condensed water is prevented from scattering into the air-conditioning target space.

  In addition, since the drainage channel 191 is closed when no condensed water is collected, the drainage channel 191 is prevented from being blocked by small animals such as foreign matter and insects when not in use. Further, the float valve 192 is inexpensive because it does not require an electric motor.

(2)
In the air conditioning indoor unit 2, the humidified air is exhausted to the side of the filter 9, and the humidified air passes through the indoor heat exchanger 12 together with the air sucked from the suction port. It is blown into the space. As a result, comfort is improved.

  As described above, according to the present invention, it is useful for an air-conditioning indoor unit that introduces humidified air generated outside through a duct.

The schematic block diagram of the air conditioning apparatus which uses the air-conditioning indoor unit which concerns on one Embodiment of this invention. The external appearance perspective view of the air-conditioning indoor unit which concerns on one Embodiment of this invention. Sectional drawing of the air-conditioning indoor unit in the AA line of FIG. Sectional drawing of the air-conditioning indoor unit in the BB line of FIG. The front view of an internal duct. Sectional drawing of the internal duct in the CC line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air conditioning apparatus 2 Air-conditioning indoor unit 12 Indoor heat exchanger 14 Drain pan 16 Internal duct 17 Drain part 18 Condensate water collection part 19 Drain part 20a Suction port 191 Drain path 192 Float valve (drain path opening / closing member)

Claims (5)

An air conditioning indoor unit that introduces humidified air generated outside into a predetermined space inside and then flows the humidified air to a space to be air-conditioned,
An internal duct (16) for transporting humidified air taken inside to the predetermined space;
A water drain (17) provided in the internal duct (16);
With
The drainage part (17)
A condensed water collecting part (18) for collecting condensed water generated by the contact of the humidified air;
A drainage section (19) for discharging the water collected in the condensed water collection section (18);
have,
Air conditioning indoor unit (2). The drainage part (19)
A drainage channel (191) formed at the bottom of the condensed water collecting part (18);
A drainage channel opening and closing member (192) for opening and closing the drainage channel (191) in response to the amount of the condensed water collected in the condensed water collecting unit (18);
Including,
The air conditioning indoor unit (2) according to claim 1. The drainage channel opening and closing member (192) is a float valve that is lifted by the condensed water and opens the drainage channel (191).
The air conditioning indoor unit (2) according to claim 2. A suction port (20a) for sucking air from below;
An indoor heat exchanger (12) for exchanging heat between the air sucked from the suction port (20a) and the refrigerant circulating in the interior;
A drain pan (14) disposed below the indoor heat exchanger (12);
Further comprising
The drainage part (19) discharges the condensed water collected in the condensed water collecting part (18) to the drain pan (14).
The air conditioning indoor unit (2) according to any one of claims 1 to 3. The humidified air is introduced into a space between the suction port (20a) and the indoor heat exchanger (12).
The air conditioning indoor unit (2) according to claim 4.

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