JPS5815821Y2 - air conditioner - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a heat pump type air conditioner that performs capacity control to reduce the capacity when there is surplus in the heating and cooling capacity, thereby reducing discomfort caused by thermocycles.

That is, the refrigerant circulates through the compressor, the outdoor heat exchanger, the pressure reducer, the indoor heat exchanger, and the compressor to cool the room; In a heat pump type air conditioner that heats a room by circulating between an outside heat exchanger and a compressor, at least two outside heat exchangers are installed, and during cooling, a portion of the high-pressure high-temperature refrigerant from the compressor is The low-pressure evaporative refrigerant from the indoor heat exchanger flows through the control pressure reducing device to increase the evaporation temperature and reduce the cooling capacity. During heating, the compressor is selectively applied to both outdoor heat exchangers. This system defrosts the air by circulating high-pressure, high-temperature refrigerant from the air conditioner, and also uses the defrosting circuit to reduce the heating capacity and control the heating and cooling capacity.

Next, this invention will be explained in detail with reference to drawings showing its embodiments.

In a heat pump type air conditioner, the outdoor heat exchangers are a first outdoor heat exchanger 1 and a second outdoor heat exchanger 2.
One of the inlets and outlets of both the outdoor heat exchangers 1 and 2 are connected to one of the three-way valves 3, which will be described later. Connected to the piping from the four-way valve 6 to the indoor heat exchanger 7 via the second electromagnetic on-off valves 4 and 5, and connected to both the outdoor heat exchangers 1 and 2.
The other inlet/outlet of is connected to both ends of a parallel circuit of the other three-way valve 8 and an auxiliary pressure reducing device 9 such as a capillary tube, which will be described later, and one three-way valve 3 is connected to the four-way valve 6,
The other three-way valve 8 is connected to the indoor heat exchanger 7 via a main pressure reducing device 10 such as a capillary tube, and the first electromagnetic on-off valve 4 and the four-way valve 6 are connected to the piping to the indoor heat exchanger I. A parallel circuit is inserted between the first return valve 11 and the first control pressure reducing device 12 such as a capillary tube, and the second
A second back pressure valve 13 and a second control pressure reducing device 14 such as a capillary tube are inserted between the electromagnetic on-off valve 5 and the piping from the four-way valve 6 to the indoor heat exchanger 1.

Note that 15 is a compressor constituting the refrigeration cycle, and 16 is an accumulator located between the compressor 15 and the four-way valve 6.

Next, details of the three-way valves 3 and 8 will be explained.

First, one of the three-way valves 3 has the first and second valve seats 17 inside.
, 1B into three chambers 19, 20, 21, - chamber 19 is connected to the four-way valve 6, and the double 20 and triple 21 are connected to the other of the first and second outdoor heat exchangers 1 and 2, respectively. The double valve body 20 and the triple valve body 21 connected to the inlet/outlet are equipped with a needle-shaped first valve body 22 and a second valve body 23, springs 24 and 25, and are connected to the first and second reverse valves 11.1.
3゜High-pressure refrigerant from the compressor 15 that has passed through the first and second electromagnetic on-off valves 4 and 5, or the first and second outdoor heat exchangers 1 and 2
When high-pressure condensed refrigerant flows into the duplex 20 or triplex 21, the pressure of the high-pressure refrigerant causes the first and second valve bodies 22, 23 to close against the springs 24.25.
It fits into the second valve seats 17 and 18, and the negative chamber 19 and the double 20 or triple 21 become disconnected.

Also, the other three-way valve 8 has the same seed as the one three-way valve 3,
The interior is divided into three chambers 28.2 by the first and second valve seats 26 and 27.
9.30, the chamber 28 is connected to the indoor heat exchanger 7 via the main pressure reducing device 10, the duplex 29 and the triple 30 are connected to the first and second outdoor heat exchangers 1 and 2. The double valve 29 and the triple valve 30 have a needle-shaped first valve body 31 and a second valve body 32, and suffling rings 33 and 34 inside, and the operation is controlled by one three-way valve 3 and the second valve body 32, respectively. The same is true.

Next, the operation of the above embodiment will be explained. 3. First,
The case of cooling operation will be explained.

During normal operation, as shown in FIG. 6, one three-way valve 3, first and second outdoor heat exchangers 1, 2, other three-way valve 8, main pressure reducing device 10, indoor heat exchanger 7, four-way valve 6, space, nitrogen reactor 16, compression The heat is circulated through the heat exchanger 15, absorbed in the indoor heat exchanger 7, and released in the first and second outdoor heat exchangers 1.2 to cool the room.

If the room is relatively cold and the cooling capacity in the above state causes discomfort such as too much cold air supplied to the room, the first solenoid valve 4 is opened as shown in FIG. One chamber 19 from the compressor 15 to the four-way valve 6 and one three-way valve 3
, the high-pressure high-temperature refrigerant that has passed through the duplex 20 is diverted to the first outdoor heat exchanger 1 side and the first electromagnetic shut-off valve 4 side, and the high-pressure high-temperature refrigerant that has passed through the first solenoid shut-off valve 4 is diverted to the first outdoor heat exchanger 1 side and the first solenoid shut-off valve 4 side. Control pressure reducing device 1
2, the evaporative refrigerant is expanded and depressurized, and flows into the low-pressure evaporative refrigerant circuit from the indoor heat exchanger 7, raising the temperature of the evaporative refrigerant by -L and reducing the capacity.

Note that at this time, since the refrigerant is a high-temperature refrigerant, liquid compression does not occur.

Furthermore, when the cooling capacity is to be lowered from the above, the second solenoid shut-off valve 5 is opened together with the first solenoid shut-off valve 4, and the high-pressure high-temperature refrigerant from the compressor 15 is transferred to the first and second outdoor heat exchangers 1 and 2.
The high-pressure, high-temperature refrigerant that has passed through the first and second electromagnetic on-off valves 4.5 is expanded in the first and second control pressure reducing devices 12.14. The evaporative refrigerant is depressurized and flows through the low-pressure evaporative refrigerant circuit, raising the temperature of the evaporative refrigerant even more than in the previous case, thereby reducing the cooling capacity.

Therefore, in the embodiment described above, the cooling capacity can be switched to three levels.

Next, the case of 1 heating operation will be explained.

During normal operation, the first and second electromagnetic on-off valves 4.5 are closed, and the four-way valve 6 allows the refrigerant to
As shown by the broken line arrow, the compressor 15 - four-way valve 6 - indoor heat exchanger 7, main pressure reducing device 10, other three-way valve 8, first,
Second outdoor heat exchanger 1, 2, one three-way valve 3, four-way valve 2
, the accumulator 16, and the compressor 15.
, the second outdoor heat exchangers 1 and 2 absorb heat, and the indoor heat exchanger 7 releases the heat to heat the room.

When the room is relatively warm in seasons such as spring and autumn, and the heating capacity described above causes discomfort such as the air supplied to the room being too warm, or when the first outdoor heat exchanger 1 When frost occurs, the first electromagnetic on-off valve 4 is opened as shown in FIG. It flows into the duplex 20#6 of one three-way valve 3 and the first outdoor heat exchanger 1 through it.

High-pressure refrigerant has flowed into the double 20 of one three-way valve 7 U
As a result, the first valve body 22 is fitted into the first valve seat 17 against the spring 24, and the -chamber 19 and the duplex 20 are disconnected from each other, and high-pressure refrigerant is supplied to the first outdoor heat exchanger 1. Because of the inflow, the first outdoor heat exchanger 1 acts as a condenser and releases heat to perform its own defrosting.

Further, since the condensed refrigerant flowing out from the first outdoor heat exchanger 1 is at high pressure, the first valve body 31 of the other three-way valve 8 fits into the first valve seat 26 against the spring 33, and the - 28 and the duplex 29 are disconnected from each other, and the condensed refrigerant passes through the auxiliary pressure reducing device 9 and flows into the second outdoor heat exchanger 2.

On the other hand, the high-pressure refrigerant from the compressor 15 that has flowed into the indoor heat exchanger 7 flows into the other three-way valve 8 through the indoor heat exchanger 7 and the main pressure reducing device 10, and the first valve body 31 1 valve seat 26
Because the refrigerant is inserted into the second three-way valve 8, it passes through the chamber 28 and the triple 30 of the other three-way valve 8 and joins the refrigerant from the auxiliary pressure reducing device 9.
It flows into the outdoor heat exchanger 2.

Since the first valve element 22 of one three-way valve 3 is fitted into the first valve seat 17, the evaporative refrigerant flowing out from the second outdoor heat exchanger 2 is transferred to the triple valve 21 of the other three-way valve 3, - flows into the compressor 15 through the chamber 19, the four-way valve 6 and the accumulator 16;

With the refrigerant cycle described above, the second outdoor heat exchanger 2
The heating capacity is reduced by using only the heating cycle, or the first outdoor heat exchanger 1 is defrosted.

In the case of defrosting operation, after completion, the first electromagnetic on-off valve 4 is closed and normal heating operation is resumed.

In addition, if frost occurs on the second outdoor heat exchanger 2, the first
As in the case of the outdoor heat exchanger 1, the second electromagnetic shut-off valve 5 is opened, and the high-pressure refrigerant from the compressor 15 is passed through the second reversing valve 13.
, the triple valve 21 of one three-way valve 3 through the second electromagnetic on-off valve 5
and flows into the second outdoor heat exchanger 2, one three-way valve 3
When the second valve body 23 fits into the second valve seat 18, the second outdoor heat exchanger 2 acts as a condenser and releases heat,
Since the second valve body 32 of the other three-way valve 8 is fitted into the second valve seat 2T to defrost itself, the condensed refrigerant that has flowed out of the second outdoor heat exchanger 2 passes through the auxiliary pressure reducing device 9. and flows into the first outdoor heat exchanger 1.

On the other hand, since the second valve body 32 of the other three-way valve 8 is fitted into the second valve seat 27, the low-pressure refrigerant from the main pressure reducing device 10 is
It passes through the chamber 28 and duplex 29 of the other three-way valve 8 and merges with the low-pressure refrigerant from the auxiliary pressure reducing device 9, and then flows into the first outdoor heat exchanger 1, the duplex 20 of one three-way valve 3, and - It flows into the compressor 15 through the chamber 19, the four-way valve 6, and the accumulator 16.

With the refrigerant cycle shown below, the first outdoor heat exchanger 1
The heating capacity is reduced by using only the heating cycle, or the second outdoor heat exchanger 2 is defrosted.

In the case of defrosting operation, after completion, the second electromagnetic on-off valve 5 is closed and normal heating operation is resumed.

Therefore, if frost forms on the 11th and 2nd outdoor heat exchangers 1 and 2 during 1 heating operation such as in 1 winter, the 11th and 2nd outdoor heat exchangers can be selectively exchanged by only operating the electromagnetic on-off valves 4 and 5. Vessels 1 and 2
It is possible to defrost the whole device.
There is no need to switch to heating or cooling operation.

Furthermore, when it is desired to reduce the heating capacity during the spring and autumn seasons, the heating capacity can be reduced by using the first defrosting circuit and opening one of the eleventh and second electromagnetic on-off valves 4 and 5.

Therefore, in the embodiment described above, the heating capacity can be switched to two levels.

In addition, in the above embodiment, each parallel circuit of the check valves 11, 13 and the control pressure reducing devices 12, 14 is connected to the first electromagnetic on-off valve 4, the second electromagnetic on-off valve 5, and the four-way valve 6 for indoor heat exchange. Although it was inserted between the piping to the vessel 7, only the parallel circuit between the first back-down valve 11 and the first control pressure reducing device 12, or the parallel circuit between the second back-down valve 13 and the second control pressure reducing device 13 Only a parallel circuit may be inserted.

In that case, the cooling capacity is switched in two stages. Also, in the above embodiment, there were two outdoor heat exchangers, but if the three-way valves 3, 8, electromagnetic on-off valves 4, 5, etc. are configured in the same manner as in the embodiment, any number of chambers can be formed. By providing an external heat exchanger, any number of capacity switches can be achieved.

As described above, according to the air conditioner of this invention, at least two outdoor heat exchangers of a heat pump type refrigeration cycle are used.
One inlet and outlet of each of the two outdoor heat exchangers is connected to one of the three-way valves, and each is connected to piping from the four-way valve to the indoor heat exchanger via an electromagnetic on-off valve,
The other inlets and outlets of both outdoor heat exchangers are connected to both ends of the parallel circuit of the other three-way valve and the auxiliary pressure reducing device, one three-way valve is connected to the four-way valve, and the other three-way valve is connected to the main pressure reducing device. By connecting to the indoor heat exchanger through the solenoid valve and inserting a parallel circuit consisting of a reverse IE valve and a control pressure reducing device between the solenoid valve and the piping, heating and cooling capacity can be achieved by simply opening and closing the solenoid valve. This makes it possible to reduce the discomfort caused by thermocycles.

[Brief explanation of drawings]

The drawings show piping diagrams of one embodiment of the air conditioner of this invention, in which Fig. 1 shows normal heating and cooling operating conditions, Fig. 2 shows reduced capacity operating conditions during cooling, and Fig. 3 shows reduced capacity and operating conditions during heating. Defrosting operation is in progress. 1.2...Outdoor heat exchanger, 3,8...
・Three-way valve, 4.5...Solenoid on-off valve, 6...
... Four-way valve, 1 ... Indoor heat exchanger, 9 ...
...Auxiliary pressure reducing device, 10...Main pressure reducing device, 1
1.13... Reverse IL valve, 12°... Control pressure reducing device, 15... Compressor. 14...

Claims (1)

[Scope of utility model registration request] At least two outdoor heat exchangers of a heat pump type refrigeration cycle are provided, and one inlet/outlet of each of the outdoor heat exchangers is connected to one three-way valve, and the four-way valve is also connected to the indoor side through an electromagnetic shut-off valve. Connect to piping to a heat exchanger, connect the other inlet and outlet of the two outdoor heat exchangers to both ends of a parallel circuit of the other three-way valve and the auxiliary pressure reducing device, and connect the one three-way valve to a four-way valve. , the other three-way valve is connected to the indoor heat exchanger via a main pressure reducing device, and a parallel circuit of a back pressure valve and a control pressure reducing device is connected between the electromagnetic on-off valve and the piping. Air conditioner with inserted.