JPS6060466A - Heat pump type air conditioner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a heat pump air conditioner that switches between cooling and heating by operating a four-way valve.

(b) Prior Art This type of air conditioner was constructed as shown in FIGS. 1 and 2.

In Figure 1, (1) is a compressor, (2) is a four-way valve, and (3) is a four-way valve.
) is an indoor heat exchanger, (4) is a pressure reducing device, (5) is an outdoor heat exchanger, (6) is a heating heater (power and bypass pipe (8)
These parallel circuits were connected sequentially in a ring with refrigerant piping.

The heater (7) is equipped with a check valve (
9), and the bypass pipe (8) was provided with a check valve (9) that was opened only during heating. and four-way valve (2)
By switching, the refrigerant discharged from the compressor (1) flows as shown by the solid line arrow during cooling operation and as shown by the broken line arrow during heating operation. That is, during cooling operation, the refrigerant flows to the heater (f), and during heating operation, it flows to the bypass pipe (8).

In Figure 2, 00) is the outdoor heat exchanger (
5) An outdoor drain pan that receives the drain water generated in (
11) is an indoor drain pan that receives drain water generated by the indoor heat exchanger (3) during cooling operation; Drain water is also stored. (
1 fan motor, (I4) is outdoor fan, θ fan 1
Indoor fan.

With this configuration, it is possible to prevent the outdoor drain pan from being heated during cooling operation and causing condensation on the surface of outdoor drain pan 0■, but during heating operation, the heating heater (7) K refrigerant does not flow. Therefore, the outdoor drain pan 00) is not heated. Therefore, the outdoor drain pan (1
There was a drawback that the drain water accumulated in 0) was cooled by outdoor air and froze.

(c) Purpose of the invention The object of the invention is to reduce the risk of freezing of drain water accumulated in an outdoor drain pan during heating operation.

2) Structure of the invention A parallel circuit is constructed from an on-off valve that is opened only during cooling operation and a pressure reducing device for heating, and a part of the refrigerant piping that connects this parallel circuit and the pressure reducing device for both cooling and heating is arranged in an outdoor drain pan. This is what I asked him to do.

(E) In the example shown in Fig. 3, (to)) is a compressor, Gυ is a four-way valve, and C3
2 is an indoor heat exchanger, (3) 1 strainer - 1C3 is a part of the refrigerant piping that connects the cooling/heating pressure element GS and the parallel circuit described later. (G) is a check that opens only during cooling operation. A parallel circuit consisting of a valve (37) and a heating pressure reducing element;
(39 is a strainer, (40) is an outdoor heat exchanger. These are connected with refrigerant piping, and the four-way valve 0υ is set to a solid line during cooling operation, and the refrigerant discharged from the compressor (30) is connected to a solid line. The refrigerant is circulated as shown by the arrow. Also, during heating operation, the four-way valve 0) is set to the state shown by the broken line, and the refrigerant discharged from the compressor (1) is circulated as shown by the broken line arrow.

Figure 4 shows the internal structure of this air conditioner, and (41) is a partition plate that divides this air conditioner (421) into an indoor chamber (5) and an outdoor chamber (B). (5) has an indoor heat exchanger (3) and an indoor fan (4:9 is the outdoor room CB), and K has an outdoor heat exchanger (4 (j) and an outdoor fan (44) built in. 4!i) is an indoor drain pan, which is placed at the bottom of the indoor heat exchanger 0. (46) is an outdoor drain pan, which is placed at the bottom of the outdoor heat exchanger (40). (47) is a drain port located in the outdoor drain pan, and drains the drain water collected in the outdoor drain pan (4G) to the outside of the machine. It is designed to lead to the drain pan (46).Therefore, drain water accumulates in the outdoor drain pan (461) during both cooling and heating operation.The outdoor drain pan (461) is equipped with a heater 051. .

The operation of the air conditioner (42) configured as above is described as follows. During cooling operation, the low temperature drain water generated by the indoor heat exchanger C3 is drained into the indoor drain pan (45I).
After the water accumulates in the tank, it is led to the outdoor drain pan (46) through the drain hose (481).On the other hand, the heating heater t3 is connected to the outdoor heat exchanger (40), as shown by the solid line arrow in Figure 3.
Relatively high temperature refrigerant passing through the check valve G force? Afr,re℃
colour.

Therefore, the low temperature drain water is heated by the heater 09 to prevent dew condensation from forming on the surface of the outdoor drain pan (46). Also, the refrigerant passing through the heater (35) is deprived of heat by the low-temperature drain water and condenses. That is, the refrigerant is subjected to a supercooling effect by this heating heater 65).

During heating operation, refrigerant whose pressure has been reduced by the cooling/heating pressure reducing element 8 flows through the heating heater 6 as shown by the broken line arrow in FIG. This cooling/heating decompression element C34) has a relatively small decompression resistance value, so it depressurizes the refrigerant flowing through the indoor heat exchanger (3'JIJ), but the degree of depressurization is low.For this reason, the refrigerant flowing through the heating heater C35 It is at medium temperature. Then, use the heating heater C351 to connect the outdoor heat exchanger (40
is heated from below to reduce the risk of freezing of the drain water produced in this outdoor heat exchanger C351. In addition, the drain water accumulated in the outdoor drain pan (461) is heated with a heating heater C35+ to reduce the risk of this drain water freezing in the cold outdoor air. During this heating operation, a cooling/heating decompression element is installed on the inlet side of the heating heater θ. (Since the reduction in the condensation effect of the refrigerant in the indoor heat exchanger (3) was suppressed to a low level by locating the indoor heat exchanger (3), the reduction in heating capacity was small.

(F) Effects of the Invention A pressure reducing device for a heat pump air conditioner is constructed by connecting a cooling/heating pressure reducing element in series with a parallel circuit of an on-off valve that opens and closes only during cooling operation and a heating pressure reducing element via refrigerant piping, This refrigerant pipe is arranged in an outdoor drain pan. Therefore, during heating operation, medium-temperature refrigerant is flowed through the refrigerant pipe to reduce the risk of freezing of drain water accumulated in the outdoor drain pan. In addition, by heating the off-campus heat exchanger from below with this refrigerant piping, it is possible to eliminate the risk of freezing of the drain water dripping from the outdoor heat exchanger.

[Brief explanation of the drawing]

Figures 1 and 2 show conventional air conditioners.
The figure is a refrigerant circuit diagram, the second figure is a sectional view showing the internal structure, and the third figure is a sectional view showing the internal structure.
4 to 4 show an air conditioner according to an embodiment of the present invention, FIG. 3 is a refrigerant circuit diagram, and FIG. 4 is a sectional view showing the internal structure. (To)...Compressor, C3υ...Four-way valve, (34
...Indoor heat exchanger, C3'd...Cooling/heating decompression element, (351...Heater, (g)...Parallel circuit, (37)...Check valve, 68)...・Heating pressure reducing element, (4b)...Outdoor drain pan. Figure 1 (Figure 2 Figure 3 n Figure 4 continued from page 10 Inventor Takashi Fudo @ Inventor Yasutomo Akutsu0 Inventor Kazunobu Hosogai

Claims (1)

[Claims] (1) A compressor, a four-way valve, an outdoor heat exchanger, a parallel circuit consisting of an on-off valve that is opened only during cooling operation, and a pressure reducing device for heating, a pressure reducing device for both cooling and heating, and an indoor heat exchanger are connected in a ring, and In a heat pump type air conditioner, the refrigerant piping connects the parallel circuit and the cooling/heating decompression device. A heat pump type air conditioner characterized in that a part of the air conditioner is disposed in the outdoor drain pan.