JPH0641055Y2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to an air conditioner having a radiation panel and capable of heating operation.

(Prior Art) Conventionally, in heating in an air conditioner equipped with a heat pump type refrigeration cycle, the indoor fan is operated in the indoor unit to circulate the indoor air through the indoor heat exchanger and blow warm air into the room. I am trying.

However, although such heating with warm air is excellent in warming the entire room, it has a drawback that it gives an uncomfortable feeling (draft feeling) such as wind hitting the human body. Further, it has a drawback that it has a weaker heating feeling than an oil stove capable of quickly warming cold limbs.

Therefore, there is an air conditioner that performs radiant heating in addition to normal warm air heating as in (Japanese Patent Laid-Open No. 55-81809). In this system, a radiation panel is provided on the front surface of the indoor unit, and a refrigerant pipe is attached to the back surface of the radiation panel to radiate the heat of the high-temperature refrigerant flowing through the refrigerant pipe into the room by the thermal radiation panel. According to this, by holding the limbs over the radiant panel, the limbs can be warmed quickly, and the draft feeling can be eliminated, resulting in a special heating effect not provided by warm air heating.

(Problems to be solved by the invention) When performing radiant heating as described above, the compressor load becomes higher than that during warm air heating, so the capacity of the compressor is reduced or the indoor fan is operated at an ultra-low speed. By using such a method, the load on the compressor is reduced and the compressor is protected.

However, the former method cannot obtain a sufficient heating effect because the capacity of the radiant heating is reduced together with the capacity of the compressor. In the latter method, the indoor fan is operated even at an extremely low speed, so there is a problem in comfort such as a slight draft feeling and blowing noise.

Therefore, in view of the above circumstances, the present invention provides an air conditioner that protects a compressor during radiant heating without operating the indoor fan or reducing the capacity of the compressor.

[Constitution of device]

(Means for solving the problem) A radiation panel for radiant heating attached to the indoor unit main body and the front panel, a radiant heat exchanger provided on the back surface of the radiant panel, and a heat insulating material for insulating the radiant heat exchanger. When,
A vertically long ventilation passage composed of the heat insulating material and the indoor unit rear plate, an air outlet provided at an upper end of the ventilation passage, an air suction opening provided at a lower end of the ventilation passage, and a diagonal line of the ventilation passage. An air conditioner comprising: an indoor heat exchanger provided in an indoor heat exchanger; and an indoor fan, the operation of which is stopped at the time of radiant heating, near the air intake port below the indoor heat exchanger.

(Operation) With the above-described configuration, natural convection in the ventilation passage can be promoted, and the indoor heat exchanger can reliably dissipate heat even when the indoor fan is stopped, so that the compressor load may increase. There is no.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, the refrigeration cycle includes a compressor 1, a four-way valve 2,
The radiant heat exchanger 3, the indoor heat exchanger 4, the decompression device 5, and the outdoor heat exchanger 6 are sequentially connected via a refrigerant pipe 7.

Since this refrigeration cycle can be performed for both cooling and heating by switching the four-way valve 2, a line 8 connecting the radiant heat exchanger 3 and the indoor heat exchanger 4 in series and a line 9 bypassing the radiant heat exchanger 3. And check valves 10 and 11, respectively,
The refrigerant is prevented from flowing to the radiant heat exchanger 3 during cooling (dashed arrow), and is allowed to flow only during heating (solid arrow).

An indoor fan 13 is provided in an indoor unit body 12 to which the radiant heat exchanger 3 and the indoor heat exchanger 4 are attached. The indoor fan motor 13M is driven by the indoor fan motor 13M, and the indoor fan motor 13M is controlled by the control circuit 14.

An outdoor fan 15 is provided opposite to the outdoor heat exchanger 6.

Next, 16 is an operation switch, which selects either hot air heating or radiant heating to start operation.

FIG. 2 shows the structure of the indoor unit body 12.

The indoor unit body 12 is, for example, a floor-standing indoor unit, and is composed of a front panel 20 and a rear plate 21. A radiation panel 22 is attached to the front panel 20 in an exposed state inside the room. In addition, a radiant heat exchanger 3 formed of a refrigerant pipe is provided on the back surface side of the radiant panel 22, and a heat insulating material 23 is provided on the back surface of the radiant panel 22 so as to cover the radiant heat exchanger 3.

The heat insulating material 23 and the indoor unit main body rear plate 21 form a vertically long ventilation passage 24, an air outlet 25 is provided at an upper end of the ventilation passage 24, and an air suction port 26 is provided at a lower end thereof. An indoor fan 13 is provided in the vicinity. And indoor heat exchanger 4
Is located above the indoor fan 13, diagonally inside the ventilation passage 24, the upper part is close to the air outlet 25, and the lower part is the air intake port 26.
It is installed close to the. Next, the operation will be described based on the above configuration.

When the heating operation is started, the refrigerant is discharged from the compressor 1 as shown by the solid line arrow in FIG. 1, the four-way valve 2, the radiant heat exchanger 3, the indoor heat exchanger 4, the pressure reducing device 5, the outdoor heat exchanger 6, and It flows through the four-way valve 2 in sequence and then returns to the compressor 1.

Since the refrigerant passing through the radiant heat exchanger 3 is in a high-temperature gas state, it heats the radiant panel 22.

At this time, either the hot air or the radiant operation is selected by the operation switch 16. When warm air heating is selected, the indoor fan is operated, so forced convection occurs in the ventilation passage 24, and the air is heated by the indoor heat exchanger sucked from the air suction port 26 to form warm air. It is blown out from the air outlet 25.

When the radiant heating is selected, the indoor fan is stopped.

At this time, natural convection of air occurs in the ventilation passage 24. This is caused by the temperature difference between the indoor side of the air suction port 26 and the indoor unit 12.

In addition, since air is heated by the indoor heat exchanger 4 in the ventilation passage 24 of the indoor unit 12, natural convection of air is further promoted.

Therefore, the ventilation passage 24 is vertically long, the air inlet 26 is provided at the lower end, the air outlet 25 is provided at the upper end, and the indoor heat exchanger 4 is arranged over the entire ventilation passage 24, so natural air convection is fast. It occurs at a high speed, the heat exchange in the indoor heat exchanger 4 is reliably performed, and the compressor load does not become high.

Therefore, in order to protect the compressor, it is not necessary to reduce the capacity of the compressor 1 or operate the indoor fan 13 at an extremely low speed.

[Effect of device]

As described above, according to the present invention, even if the operation of the indoor fan is stopped, a considerable amount of natural convection occurs, so that the heat exchange in the indoor heat exchanger is reliably performed and the compressor load does not increase.

Therefore, it is not necessary to dare to perform compressor protection operation such as compressor capacity deterioration and indoor fan ultra low speed operation.
A sufficient heating effect due to radiation can be obtained, and some draft feeling and blowing noise are also eliminated, which makes it possible to further improve comfort.

[Brief description of drawings]

FIG. 1 is a diagram showing the structure of a refrigerating cycle in one embodiment according to the present invention, and FIG. 2 is a diagram showing the internal structure of an indoor unit in the same embodiment. 3 ... Radiant heat exchanger, 4 ... Indoor heat exchanger 12 ... Indoor unit body, 13 ... Indoor fan 20 ... Front panel, 21 ... Indoor unit rear plate 22 ... Radiant panel, 23 ... Insulation material 24 …… Ventilation passage, 25 …… Air outlet 26 …… Air inlet

Claims (1)

[Scope of utility model registration request] 1. A radiant heating radiant panel attached to an indoor unit main body and a front panel, a radiant heat exchanger provided on the back side of the radiant panel, a heat insulating material for insulating the radiant heat exchanger, and this heat insulating material. And a vertically long ventilation passage consisting of the indoor unit main body rear plate, an air outlet provided on the upper surface of the main body at the upper end of the ventilation passage, and an air intake opening provided at the lower portion of the front surface of the main body at the lower end of the ventilation passage, An air conditioner characterized by comprising an indoor heat exchanger provided on a diagonal line of a ventilation path, and an indoor fan which is in the vicinity of the air suction port below the indoor heat exchanger and whose operation is stopped during radiant heating. Machine.