JPH0332904Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention provides a separate air conditioner, specifically an outdoor unit, with multiple compressors of different capacities, one outdoor heat exchanger, and a fan. This invention relates to a separate air conditioner that connects a plurality of indoor units and is capable of expanding the range of operating limits for heating and cooling operations.

(Prior Art) Conventionally, in an air conditioner using a plurality of compressors with different capacities, a coil corresponding to each compressor is incorporated into one outdoor heat exchanger and connected to a plurality of indoor units. For example, a system in which separate refrigeration cycles are formed is disclosed in Japanese Patent Application Laid-open No. 1973-
As shown in Publication No. 11640, this is already known. As shown in FIG. 4, one outdoor heat exchanger A installed in the air conditioner configured as above is connected to a large capacity coil B connected to a large capacity compressor.
Small capacity coils C communicating with the small capacity compressor are arranged alternately at the upper position of the outdoor heat exchanger A, and a fan D is installed in the center of this outdoor heat exchanger A. The coils B and C are designed to generate a flow of air and exchange heat in each coil B and C.

(Problem to be solved by the invention) However, according to the air conditioner configured as above, the small capacity coil C and the large capacity coil B
When heat exchange was performed at the same time, the following problems occurred.

That is, each of the coils B and C is arranged on the upstream side and the downstream side with respect to the flow, and furthermore,
Since these coils B and C are arranged alternately, the coil B or C located on the downstream side of the wind
However, due to the increase or decrease in the temperature of the wind generated by heat exchange between coil C or B located on the upstream side of the wind, sufficient heat exchange is not performed, and therefore, small capacity coil C or large capacity coil There was a large difference in the operating conditions between when only one system of B was operated and when both systems were operated simultaneously, and in particular, there was a large difference in the limit operating characteristics when both systems were operated simultaneously. For example, if both systems are operated simultaneously and the cooling load is overloaded, the high pressure will rise abnormally and the pressure switch will turn off. When the temperature is low, frost occurs and at the same time the low pressure drops abnormally, leading to an increase in the amount of frost.

The present invention was developed in view of the conventional problems mentioned above.Even if different refrigerant systems are operated at the same time, an abnormal rise in high pressure during cooling or an abnormal drop in low pressure during heating may occur. To provide a separate air conditioner that can perform cooling and heating operations without heating, can expand the operating limit range accordingly, and can reduce frost formation on a small-capacity coil during heating.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a plurality of compressors 5, 5' having different capacities in the outdoor unit 2.
and one outdoor heat exchanger 1 and fan 15 are provided,
It is a separate air conditioner in which a plurality of indoor units 4, 4' are connected, and the outdoor heat exchanger 1 is connected to a small capacity coil 1a which communicates with a small capacity compressor 5 of the compressors 5, 5'. It is characterized in that it is divided into a large-capacity coil 1b communicating with a large-capacity compressor 5', and that the small-capacity coil 1a is arranged on the faster side of the wind speed distribution with respect to the large-capacity coil 1b.

(Function) In the present invention, with the above configuration, the small capacity coil 1a and the large capacity coil 1b are divided, so even when both systems are operated at the same time, they do not interfere with each other, and operation similar to single system operation is possible. There is no abnormal rise in high pressure, no abnormal drop in low pressure during heating, and less frost formation on the small capacity coil 1a.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows an outdoor heat exchanger 1 which is a main part of the separate air conditioner according to this embodiment, FIG. 2 shows the wind speed distribution in this outdoor heat exchanger 1, and FIG. 1 shows a refrigerant piping system diagram of an example.

As shown in Fig. 3, the separate air conditioner of this embodiment has indoor units 4, 4' on a small capacity side and a large capacity side connected to an outdoor unit 2 via connecting pipes 3, 3'. The outdoor unit 2 includes small-capacity and large-capacity compressors 5, 5', four-way switching valves 6, 6', and the outdoor heat exchanger 1, which serves as a condenser during cooling and an evaporator during heating. Expansion mechanisms 8, 8' consisting of capillary reach tubes, an accumulator 9,
9', and these devices are connected to refrigerant pipes 10, 1.
0' to form a plurality of independent refrigerant systems, and the indoor units 4, 4' on the small capacity side and large capacity side function as evaporators during cooling and condensers during heating. Indoor heat exchanger 11,1
1' is installed internally, and these indoor heat exchangers 11, 11' are
Gas pipes 13 and 1 are connected to the outdoor unit 2 via connection pipes 3 and 3' and closing valves 12 and 12'.
3' and the liquid pipes 14, 14'.

In the outdoor heat exchanger 1 of the outdoor unit 2, a fan 15 for discharging air upward is arranged at the upper center position.

Further, the gas pipes 13, 13', specifically, the gas pipes 13, 13' which serve as high pressure gas pipes during heating and the low pressure gas pipes during cooling, and the liquid pipes 14, 14', specifically the expansion mechanisms 8, 8. A hot gas bypass pipe 16, 16' is provided between the liquid pipe 14, 14' which connects the shutoff valve 12, 12' and becomes a low-pressure liquid pipe during cooling and a high-pressure liquid pipe during heating. tube 1
6, 16' are equipped with high pressure control valves 17, 17' and check valves 21, 21' that allow flow only from the bypass pipes 16, 16' to the liquid pipes 14, 14', and the high pressure control valves 17, 17' and check valve 21,
Injection tubes 19, 19' having pressure reducing mechanisms 18, 18' are connected to the intermediate portion between the injection tubes 19, 1 and 21'.
9' is connected to suction gas pipes 20, 20' connecting the suction ports of the compressors 5, 5' and the four-way switching valves 6, 6'.

What is shown in FIG. 1 is the fan 15 and the outdoor heat exchanger 1, which are the essential parts of the present invention in the separated air conditioner constructed as described above. Since the outdoor air sucked in from the three sides of the air is blown upward,
a small capacity coil 1a communicating with the small capacity compressor 5;
The large-capacity coil 1b that communicates with the large-capacity compressor 5' is divided into upper and lower parts, and both coils 1 are divided into upper and lower parts.
In addition to preventing the coils a and 1b from overlapping, the small-capacity coil 1a is arranged above the large-capacity coil 1b, on the side where the wind speed distribution is faster.

Note that the cross fins of the outdoor heat exchanger 1 are as follows:
In this example, common fins are used, but coil 1
Separate fins may be used for a and lb.

Therefore, in the above configuration, the heating cycle consists of the compressors 5, 5', the four-way switching valves 6, 6', the indoor heat exchangers 11, 11', the expansion mechanisms 8, 8', and the outdoor heat exchangers. 1, four-way switching valve 6, 6', compressor 5,
5', and the cooling cycle consists of compressors 5, 5', four-way switching valves 6, 6', outdoor heat exchanger 1, expansion mechanism 8,
8', indoor heat exchanger 11, 11', four-way switching valve 6,
6' and a circulation cycle to the compressors 5 and 5'.

As shown in FIG. 1, the outdoor heat exchanger 1 of the separate air conditioner according to this embodiment is divided into a small capacity coil 1a and a large capacity coil 1b, so that when both systems are operated simultaneously, one Since the air that has passed through one coil 1a or 1b does not flow to the other coil 1b or 1a, operation similar to single-system operation is possible. This prevents the low pressure from dropping abnormally.

In addition, as shown in Figures 1 and 2, the small capacity coil 1a is placed above the large capacity coil 1b, which is the side where the wind speed distribution is faster, so that heat exchange in the small capacity coil 1a is efficient. Therefore, frost formation on the small capacity coil 1a is reduced.

(Effects of the invention) As described above, the present invention divides the outdoor heat exchanger 1 into the small capacity coil 1a that communicates with the small capacity compressor 5 and the large capacity coil 1b that communicates with the large capacity compressor 5'. , and the small capacity coil 1a is replaced by the large capacity coil 1.
In contrast to b, since it is placed on the side where the wind speed distribution is faster, even when both small-capacity and large-capacity systems (different refrigerant systems) are operated at the same time, operation similar to single-system operation is possible, and high pressure during cooling can be achieved. Cooling/heating operation can be performed without causing an abnormal rise in pressure or an abnormal drop in low pressure during heating, the operating limit range can be expanded accordingly, and frost formation on a small capacity coil 1a can be reduced during heating.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an embodiment of an outdoor heat exchanger which is the main part of the present invention, Fig. 2 is an explanatory diagram showing the wind speed distribution of this outdoor heat exchanger, and Fig. 3 is an embodiment of the invention. FIG. 4 is an explanatory diagram showing the arrangement of coils in a conventional outdoor heat exchanger. 1...Outdoor heat exchanger, 1a...Small capacity coil,
1b...Large capacity coil, 2...Outdoor unit,
4, 4'...Indoor unit, 5...Small capacity compressor,
5'...large capacity compressor, 15...fan.

Claims (1)

[Scope of utility model registration request] The outdoor unit 2 includes a plurality of compressors 5, 5' with different capacities, one outdoor heat exchanger 1, and one fan 15.
The outdoor heat exchanger 1 is a separate air conditioner in which a plurality of indoor units 4, 4' are connected.
is divided into a small capacity coil 1a communicating with the small capacity compressor 5 and a large capacity coil 1b communicating with the large capacity compressor 5' among the compressors 5 and 5', and
A separate air conditioner characterized in that the small capacity coil 1a is arranged on the side where the wind speed distribution is faster than the large capacity coil 1b.