JPS62175541A - Heat pump type air conditioner - Google Patents

Abstract

PURPOSE:To reduce unpleasant feeling caused by blowing out cold wind from a blower on the indoor side by operating intermittently an indoor side blower during defrosting operation and shorten defrosting time by increasing heat absorption during defrosting operation. CONSTITUTION:When frost is formed on an outdoor side heat exchanger 3 during room heating operation because the outdoor air temperature is low, a four-way valve 2 is interchanged in order to melt the frost and an outdoor blower 9 is stopped at a fixed tie interval to carry out defrosting operation giving air cooling. At this time a blower 10 at the indoor side is made to issue signal repeatedly. Namely, the operation of a motor 10a is stopped before an indoor side blower 10 enters steady operation and the motor 10a is energized before blast stops, thereby giving intermittent operation to the indoor side blower 10.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat pump type air conditioner.

BACKGROUND OF THE INVENTION Conventionally, defrost operation of an outdoor heat exchanger during low outside air heating operation of a heat pump type air conditioner is carried out by stopping the outdoor blower and switching a four-way valve to perform cooling operation. At this time, the indoor blower is stopped to prevent cold air from blowing into the room, or the indoor blower is operated with a gentle breeze to shorten the defrost operation time.

Problems to be Solved by the Invention However, when the indoor blower is stopped, there is a problem in that the defrosting operation time increases due to a decrease in the amount of heat absorbed, and when the indoor blower is operated with a gentle breeze, the cold air blowing In addition to this, there was a problem in that the installation of a breeze tap for the blower motor increased the cost.

Means for Solving the Problems In order to solve the above problems, the present invention operates the indoor fan intermittently during the defrost operation.

Function As described above, the present invention reduces the discomfort caused by blowing cold air by intermittent operation of the indoor fan during defrost operation. Additionally, the amount of heat absorbed during defrost operation increases compared to when the blower is stopped.

EXAMPLE Hereinafter, a heat pump type air conditioner according to an embodiment of the present invention will be explained based on the drawings. Figure 1 shows the refrigeration cycle of a heat pump type air conditioner, and Figure 2 shows the indoor φ11
It is a time chart figure which shows the operation of a blower and the air volume at that time.

1 is a compressor, 2 is a four-way valve, 3 is an outdoor heat exchanger, 4 is a heating capillary tube, 6 is a check valve that forms a passage that bypasses the heating capillary tube 4 during cooling,
Reference numeral 6 indicates a capillary tube for cooling, reference indicates a check valve that forms a passage that bypasses the capillary tube 6 for cooling during heating, and reference numeral 8 indicates an indoor heat exchanger, which are connected in a ring to form the refrigeration cycle of a heat pump type air conditioner. is formed.

9 is an outdoor fan that blows air to the outdoor heat exchanger 3;
10 is an indoor fan that blows air to the indoor heat exchanger 8.

During heating operation (dashed line arrow), especially when the outside air temperature is low, frost forms on the outdoor heat exchanger 3, and the four-way valve 2 is switched to melt the frost at regular intervals (for example, 1 hour), and the outdoor fan 9 is turned on.
A defrost operation is performed in which the air conditioner is stopped and a cooling operation (solid arrow) is performed. At this time, the indoor fan 10 is repeatedly turned on and off as shown in FIG. That is, the power supply to the motor 10a is stopped before the indoor fan 11 starts stable operation, and the power supply to the motor 10a is started before the air blowing stops, thereby changing the air volume as shown in FIG. 2.

With the above configuration, the amount of cold air blown into the room during defrost operation is reduced, which alleviates discomfort, and the amount of heat absorbed during defrost operation is increased, so the defrost time can be shortened, and the indoor blower 10 Since there is no need to provide a breeze tap on the electric motor 10a, the cost does not increase.

Effects of the Invention As explained above, since the indoor fan is turned on and off during the defrost operation of the present invention, less cold air is blown into the room, which alleviates discomfort and increases the amount of heat absorbed during the defrost operation. Therefore, the defrosting time can be shortened, and there is no need to provide a breeze tap on the motor of the indoor fan, which has the effect of not increasing costs.

[Brief explanation of drawings]

FIG. 1 is a refrigeration cycle diagram of a heat pump type air conditioner according to an embodiment of the present invention, and FIG. 2 is an operation time chart of an indoor fan and a diagram of changes in air volume at that time according to an embodiment of the present invention. 8...Indoor heat exchanger, 1o...Indoor blower. Name of agent: Patent attorney Toshio Nakao and one other name
2 Figure temporarily open

Claims (1)

[Claims] Heat pump type air equipped with a refrigeration cycle that connects a compressor, four-way valve, outdoor heat exchanger, indoor heat exchanger, cooling pressure reducer, and heating pressure reducer, and allows the indoor blower to operate intermittently during defrost operation. harmonizer.