JPH04198637A - Air-conditioner for building - Google Patents

Abstract

PURPOSE:To prevent cold air from entering a room during defrosting operation by a method wherein defrost ports that are communicated to the outdoor are formed at the front and rear sides of a secondary heat exchanger located in a duct, and changeover valves are provided at positions near both ends of the duct from the defrost ports. CONSTITUTION:During normal heating operation, defrost ports 10 and 11 are closed by changeover valves 12 an 13, allowing only circulating air to be circulated along a duct 4, and a room is heated by a secondary heat exchanger 6. During defrosting operation, the changeover valves 12 and 13 are turned from stand-by position to defrosting position, causing the defrost ports 10 and 11 to be opened together. Thereby, parts of the duct 4 from vertical parts 4a to both ends 4b and 4c are blocked, and the front and rear parts of the secondary heat exchanger 6 are communicated to the outdoor through the defrost ports 10 and 11 and a vent hole 2, and heat exchange takes place between the secondary heat exchanger 6 and the outside air, preventing cold air from entering the room.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air conditioner for a building, and more specifically, when performing a defrosting operation on a primary heat exchanger during a heating operation, the invention relates to an air conditioner for a building. The present invention relates to a heating system for a building that can prevent the intrusion of foreign substances.

[Prior Art] Conventionally, as shown in FIG. 2, for example, as shown in FIG. 2, this type of air conditioner has an air conditioner room 3 provided outside a house 1 with a vent 2 through which outside air passes. In air conditioning equipment room 3,
A duct 4 is provided with both ends opening into the interior of the house 1, and a primary heat exchanger 5 is provided at the bottom of the air conditioning equipment room 3, while a secondary heat exchanger 6 is provided in the middle of the duct 4.
It is known that this is provided.

In such an air conditioner, by rotating the fan of the primary heat exchanger 5, heat is exchanged between the heat medium inside the heat exchanger 5 and the outside air, and the heat medium is expanded or compressed. By heating and cooling, supplying this heat medium to the secondary side heat exchanger 6 via the pipe line 8, and further rotating the fan 9 of the secondary side heat exchanger 6, the connection between the inside of the duct 4 and the room is The indoor air is circulated to heat or cool the indoor air. Then, the heat medium that has been heat exchanged with the air in the duct 4 is sent to the primary heat exchanger 5 via the pipe line 8,
The heat medium is heated and cooled again and supplied to the secondary heat exchanger 6 to continue heating and cooling.

By the way, in such an air conditioner, heat is exchanged between the primary heat exchanger 5 and the outside air at a low temperature during heating operation, so there is a risk that frost may form on the primary heat exchanger 5 and reduce thermal efficiency. . For this reason, in conventional air conditioners, each heat exchanger 5.6 is temporarily operated in a cooling operation to perform a defrosting operation in which the temperature of the primary heat exchanger 5 is increased to remove frost as necessary. This prevents loss of thermal efficiency.

[Problem to be solved by the invention] However, since the above-mentioned defrosting operation temporarily stops the heating operation and performs the cooling operation, the duct 4
This had the disadvantage that the air inside the room was cooled and cold air entered the room, impairing the comfort of the room.

The present invention was made against this background, and an object of the present invention is to provide an air conditioner that does not allow cold air to enter a room when defrosting operation is performed during heating operation.

[Means for Solving the Problems] In order to solve the above problems, the present invention forms defrost ports that communicate with the outdoors before and after the secondary heat exchanger in a duct that opens indoors at both ends, and A switching valve that reciprocates between a position where the defrost port is closed and a position where the duct is closed is provided at a portion closer to both ends of the duct than the defrost port.

[Function] According to the above configuration, during normal heating, by holding the switching valve on the side that closes the defrost port, indoor air is circulated between the indoor room and the duct, and the secondary heat exchanger is used to cool the indoor air. Heating the air.

When performing defrosting operation, the switching valve is switched to the side that closes the duct and held, and the front and rear of the secondary heat exchanger are communicated with the outside through the defrost port. This results in
Outside air is introduced from the defrost drawer installed in front of the secondary heat exchanger and is sucked into the secondary heat exchanger, while the exhaust air from the secondary heat exchanger is released outside through the defrost port. .

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to FIG. Note that the same components as those in the conventional example described above are given the same reference numerals, and their explanations will be omitted.

As shown in FIG.
A primary heat exchanger 5 is provided in the lower part of the air conditioning equipment room 3 that communicates with the outdoors via a Defrost drawers 10.11 passing through the duct 4 are formed before and after the side heat exchanger 6, and switching valves 12.13 are provided at portions closer to both ends of the duct 4 than the defroster drawers 10.11. has been done.

Each of the defrost drawers 10 and 11 is formed to have substantially the same cross-sectional shape as the vertical portion 4a of the duct 4. A vent 2 is added to the side wall of the air conditioning equipment room 3 facing the defrost drawer 10.11, so that the air inside the duct 4 and the outside air can mutually enter and exit through the defrost drawer 10.11. It has become.

On the other hand, the above switching valve]2.13 is the vertical part 4a of the duct 4.
It is a plate-shaped member with a similar shape that is slightly larger than the cross-sectional shape of. Each of these switching valves 12.13 is attached to the upper end of the defrost drawer 10, 11 via a hinge 14.15, and extends downward from the hinge 14.15 to a standby position where it closes the defrost drawer 10.11. , and a defrost position extending horizontally from the hinges 14, 15 and closing the duct 4.

Each of these switching valves 12 and 13 is connected to an actuator (not shown), and is driven by the actuator and held in the defrost position only when the primary heat exchanger 5 performs defrosting operation, and is held at the defrost position during other normal heating operations. It is held in the standby position during cooling operation. In this case, a known actuator such as a motor, a solenoid, or a pneumatic cylinder can be used as the actuator.

However, in the air conditioner configured as above,
During normal heating operation, the defrost drawer 10.11 is closed by the switching valve 12.13, so only indoor air circulates in the duct 4, which causes heat exchange between the secondary heat exchanger 6 and the indoor air. The exchange takes place and the room is heated.

On the other hand, when defrosting operation is performed, the switching valve 12.13
is driven from the standby position to the Tefrost position, thereby closing the portion of the duct 4 from the vertical portion 4a to both ends 4b and 4c. Therefore, before and after the secondary heat exchanger 6,
It communicates with the outside through the defrost drawers 10, 11 and the vent 2, which are opened as the switching valves 12 and 13 move, and as a result, heat exchange is performed between the secondary heat exchanger 6 and the outside air.

In this way, according to this embodiment, the exhaust gas from the secondary heat exchanger 6 during the defrosting operation can be exhausted to the outside by operating the switching valves 12, 13, so that cold air does not enter the room during the defrosting operation, and this As a result, indoor comfort is maintained during heating.

Note that the configuration of this embodiment is just an example, and the shapes of the defrost drawer 10, 11 and the switching valve 12, 13,
Alternatively, the shape and the like of the duct 4 may be modified as appropriate.

[Effects of the Invention] As explained above, according to the present invention, during the defrosting operation during heating, the position of the switching valve is switched to the side that closes the duct and is held, so that the secondary heat exchanger Since the front and rear parts of the heat exchanger can be communicated with the outside through the defrost port, the cool air exhausted from the secondary heat exchanger during the defrosting operation is discharged outside. Therefore, it is possible to prevent cold air from entering the room during the defrosting operation, thereby achieving an excellent effect of maintaining indoor comfort.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a diagram showing the configuration of a conventional example. 4...Duct, 5...Primary side heat exchanger, 6...Secondary side heat exchanger, 10.11...Defrost drawer, 12.13...Switching valve.

Claims (1)

[Claims] A primary heat exchanger installed outdoors to exchange heat with outside air, and a primary side heat exchanger installed in the middle of a duct that opens indoors at both ends to exchange heat with indoor air passing through the inside of the duct. and a secondary heat exchanger for exchanging heat between the ducts, and by circulating a heat medium between the primary heat exchanger and the secondary heat exchanger, the air temperature in the duct can be adjusted. In an air conditioner for a building that regulates 1. An air conditioner for a building, comprising a switching valve that reciprocates between a position where a defrost port is closed and a position where the duct is closed.