JPS5826945A - Air-conditioning machine - Google Patents

Abstract

PURPOSE:To enable to effect the capacity cntrol of the machine simply by a method wherein the capacity control either 100% operation operating two sets of compressor or 50% operation operating one set of compressor is effected in accordance with an indoor temperature. CONSTITUTION:A plurality of compressor 12, 13 are mounted on an outdoor unit 11 and the refrigerant medium circuits of the compressors are separated into two imdependent circuits respectively in outdoor side heat exchangers 14, 15 while the circuits of indoor side heat exchangers 18, 21 for one set of indoor unit 17 are separated into plural independent circuits and operating numbers of the compressor 12, 13 are controlled in accordance with an indoor load condition. Thus, the 100% operation operating two sets of compredssor or the 50% operation operating one set of compressor is efcfected in accordance with the indoor temprature to control the air-conditioning capacity. According to this method, the system of the capacity control becomes very simple and the capacity control may be effected without employing a complicated control circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner, and an object thereof is to easily control the capacity.

Conventionally, in a medium-sized refrigerator such as a package air conditioner, as shown in FIG. 1, an outdoor unit 1 is provided with a compressor 2 and an outdoor heat exchanger 3, and is connected to an indoor unit 6 through refrigerant piping 4.5. . The indoor unit is equipped with an expansion valve 7 and an indoor heat exchanger 8.

A package air conditioner is constructed by a so-called 1:10 combination. However, these capacity control methods have come to include methods such as pole number conversion and frequency control of the compressor 2, but these devices have drawbacks such as being complicated and expensive. was.

The present invention solves the above-mentioned conventional drawbacks, and a first embodiment thereof will be described below with reference to FIGS. 2 and 3.

The outdoor unit 12 has a No. 1 compressor 11, a No. 2 compressor 13, and the No. 1 compressor 12 and the No. 2 compressor 13 have the same capacity. 14 is No. 1 compressor 120 outdoor heat exchanger,
Reference numeral 16 denotes an outdoor heat exchanger of the No. 2 compressor 13, and both of these outdoor heat exchangers 14 and 15 are each constituted by an independent circuit, and are constituted as one outdoor heat exchanger 16.

17 is an indoor unit, 18 is an indoor heat exchanger connected to the refrigerant pipe 19 and expansion valve 20 from the outdoor heat exchanger 14 of the No. 1 compressor 12, and 21 is the outdoor heat exchanger 1 of the No. 2 compressor 13.
6, the indoor heat exchanger connected to the refrigerant pipe 21 and the expansion valve 22, and both indoor heat exchangers 18 and 21 are configured as one indoor heat exchanger 23 and are an independent circuit. There is.

2jj and 25 are refrigerant pipes. In this way, a plurality of compressors are provided in the outdoor unit 11, and refrigeration cycles are provided independently in the outdoor heat exchanger 16 of the outdoor unit 11 and the indoor heat exchanger 23 of the indoor unit 17. Depending on the load, when only the No. 1 compressor 12 is operated, the compressor is operated at 50%, and when both the No. 1 and No. 2 compressors are operated, the compressor is operated at 100%. To explain such control using the circuit shown in FIG. 3, 28 is an outdoor unit side circuit, 29 is an indoor unit side circuit, 30 is an indoor side power supply, 31
32 is an operation switch, and 32 is a blower for the indoor unit. 33 is a two-stage thermostat attached to the suction side of the indoor unit to sense the room temperature, 33a is a contact piece connected to the relay 34 of the No. 1 compressor 12, and 33b is connected to the relay 36 of the No. 2 compressor 13. Contact piece, relay 34 is outdoor power supply 3
The contact piece 34a of the No. 1 compressor 12 connected to the No. 1 compressor 8 and the contact piece 34b of the outdoor blower 37 are connected. Also, relay 36
is the contact piece 3 of the No. 2 compressor 13- connected to the outdoor power supply 38
6a and the contact piece 3eb of the outdoor blower 37.

In the above configuration, for example, during cooling, the refrigeration cycle in FIG. 2 is configured as described above, and its control device operates the indoor fan 32 by turning on the operation switch 31, and when the indoor temperature is high, The contact pieces 33a, 33b, 33, and 35 of the two-stage thermostat 33 are all turned on, and the relays 34 and 36 are excited, and the contact pieces 34
a.

36a is ONI, No. 1 compressor 12. No. 2 compressor 1 and 3
At the same time, the contact pieces 34b and 36b are also turned on, and the outdoor air blower @37 is operated to operate at 100% of its full capacity. Next, when the load decreases, the two-stage thermostat 33
Since the contact piece 33b is turned OFF and the relay 36 is de-energized, the contact piece 36a is turned OFF and the No. 2 compressor 13 is stopped, resulting in a 50% capacity control operation. At this time, the contact piece 36b is also turned OFF, but the contact piece 34b75f is ON.
l.

Since it is still in use, the outdoor blower 37 continues to operate.

Next, a second embodiment of the present invention will be described with reference to FIGS. 2 and 4.

The basic configuration of this embodiment is the same as that of the first embodiment shown in FIG. 2, except that the control section is changed, and the control section will be explained below.

In FIG. 4, 39 is an outdoor power source, and 40 is an outdoor blower connected to the power source 39 at one end and to the contact piece 42 at the other end. 41 is a first coil that is excited by power transmitted from the indoor unit 17 side, and is turned on by this first coil 41.

The contact piece 42 and the contact piece 43 which are turned off are provided. One end of this contact piece 43 is connected to the Vi1 compressor 12, and the other end is connected to the outdoor power source 39. 44 is an indoor unit) 17[
A second coil is excited by the power transmitted from the power source 111, and contact pieces 45 and 46 are provided that are turned on and off by the second coil 44, and one end of the contact piece 46 is connected to the power source 39.
The other end is connected to the outdoor blower 4o, while the contact piece 46
is connected to the power supply 39 at one end and to the No. 2 compressor 13 at the other end.

47. 48 is a terminal board, 49 is an operation switch provided in the indoor unit 17, 60 is a strong/weak common contact 61 at one end,
The other end is connected to the first coil 41 on the outdoor unit side,
A thermostat 62 that senses the temperature of the indoor air has one end connected to the indoor power source 53 and the other end connected to the elastic contact point 54 of the operating switch.
, the indoor blower connected to the weak contact 66, 56 is an elastic contact whose one end is connected to the power source 63 and the other end is connected to the second coil 44 of the outdoor unit.

When the thermostat 50 is turned on due to the room temperature in the upper screen configuration, it means that the common strong and weak contacts 51 are energized, and if the operation is changed from stop to the strong wind elastic contacts 54 and 56, the indoor blower 52 turns on the elastic contacts 64. While energized and operated at high power, the coil 41 is energized via the strong/weak common contact 61 and the thermostat 60, and the contact pieces 42 and 43 are turned on.
,, the outdoor blower 4o and the No. 1 compressor 12 are operated.

Along with this operation, the elastic contacts 66 are energized to excite the coil 44, so that the contact pieces 45, 46 are ONL, and the No. 2 compressor 13 is operated through the contact pieces 46. In this way, when the operation switch 49 is operated in a strong operation mode, both compressors No. 1 and No. 2 are operated, and the indoor blower 52 is operated in accordance with the amount of refrigerant flowing into the side heat exchanger of the indoor heat exchanger 23. be. Next, when the operation is set to low operation, the indoor fan 52
The weak contact 55 is energized and the air blowing becomes weak, and the strong/weak common contact 61 and the thermostat 60 . first coil 41
When the first coil 41 is excited, the contact piece 42
．． 43 is turned on, the outdoor blower 40 and the No. 1 compressor 12 are operated, and only the No. 1 compression @12 is operated, and the indoor heat exchanger 18 is used in place of the outdoor heat exchanger 14, and the indoor air blower l! l! The ability to cope with weak winds of 62 is controlled.

Next, when the thermostat 50 is turned OFF, the operation switch 49 turns off the coil 41 from both the No. 1 and No. 2 compressor operating states in the case of elastic contact, so the No. 2 compressor 13
will be operated only. In addition, in the case of a weak contact, the thermostat 50 is turned off, so the measuring compressor is also stopped.

As described above, according to the present invention, the capacity is controlled depending on the room temperature to operate the compressor to perform 100% operation or to operate one compressor to perform 60% operation. Therefore, the capacity control method becomes very simple, and it exhibits practical effects such as ability to be controlled without the need for a complicated control circuit.

Still further, according to the present invention, the indoor blower is switched between strong wind and weak wind using the operation switch, and by switching, the number of operating No. 1 compressor and No. 2 compressor is changed. Two compressors are operated, and when the wind is weak, one compressor is operated.The capacity is controlled by a button that corresponds to each independent compressor circuit, so indoor delivery is possible. The balance between the air volume and the cooling capacity is kept almost constant, which improves the efficiency of the cooling operation, and provides practical effects such as the ability to easily perform capacity control operation.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a conventional refrigeration cycle, Fig. 2 is a block diagram of a refrigeration cycle of an air conditioner according to the first embodiment of the present invention, and Fig. 3 is a control circuit diagram of the air conditioner. FIG. 4 is a control circuit diagram of an air conditioner according to a second embodiment of the present invention. 11...Outdoor, Unino), 12.13...
・・Compressor, 16・・・・−・Outdoor heat exchanger, 23・
... Indoor heat exchanger, 41, 44 ... Coil, 49 ... Operation switch, 60 A --- Thermostat, 62 ... Indoor blower, 54. 5
6...Strong and weak points, 55...Weak points. Name of agent: Patent attorney Toshio Nakao and 1 other person
figure . Figure 4

Claims (3)

[Claims] (1) Multiple compressors are installed in the outdoor unit, and the refrigerant circuits of these multiple compressors are made into independent circuits in the outdoor heat exchanger, and the indoor heat exchanger of one indoor unit is This air conditioner separates the circuit into a plurality of circuits, configures independent circuits, and controls the number of compressors in operation according to the indoor load condition. (2) Multiple compressors are installed in the outdoor unit, and the refrigerant circuits of these multiple compressors are made into independent circuits in the outdoor heat exchanger, and the indoor heat exchanger circuit of one indoor unit is is also separated into a plurality of parts, an independent circuit is configured, and the common contact of the operation switch provided on the indoor unit and the thermostat are energized to excite the coil of the outdoor unit, and this coil is used to connect the contact piece of the outdoor fan and the The circuit where the contact for the No. 1 compressor turns on and the strong contact of the operation switch are energized to excite the coil of the outdoor unit.
This coil has a circuit that turns on the contact piece for the outdoor blower and the contact piece for the No. 2 compressor.When the indoor blower is in strong operation, both compressors are operated, and when the indoor blower is in weak operation. At times, one compressor is operated.
Air conditioner. (3) When the indoor blower is operating at high speed, both compressors of No. 1 compressor and No. 2 compressor are operated by the circuit that energizes the common contact and the thermostat, and when the indoor blower is operating at low speed. The air conditioner according to claim 2, wherein the No. 1 compressor is operated by a circuit that energizes the common strong and weak contacts and the thermostat.