JP2836661B2 - Multi-room air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-room cooling and heating apparatus having a heat source side refrigerant cycle and a use side refrigerant cycle.

[0002]

2. Description of the Related Art Conventionally, a multi-room cooling / heating apparatus having a heat source side refrigerant cycle and a use side refrigerant cycle is disclosed in
No. 6536.

A conventional multi-room air conditioner of this type will be described below with reference to the drawings. FIG. 4 shows a refrigeration cycle diagram of a conventional multi-room cooling / heating device. 4, 1a and 1b are compressors, 2a and 2b are four-way valves, 3a and 3b are heat source side heat exchangers, 4a and
4b is a decompression device for cooling, 5a and 5b are decompression devices for heating, and 6a and 6b are decompression devices for cooling during heating.
4b, a check valve 7a, 7b is a check valve for closing the cooling / heating decompression devices 5a, 5b, 8a, 8b is a first auxiliary heat exchanger, and these are connected in a ring shape; Heat source side refrigerant cycles h and h 'are formed.

[0004] Reference numerals 9a and 9b denote second auxiliary heat exchangers, which are integrally formed so as to exchange heat with the first auxiliary heat exchangers 8a and 8b.

[0005] Reference numerals 10a and 10b denote refrigerant amount adjusting tanks for adjusting the amount of refrigerant during cooling and during heating. Reference numerals 11a and 11b denote outdoor flow valves for adjusting the flow rate of refrigerant to the second auxiliary heat exchangers 9a and 9b. Reference numeral 12 denotes a refrigerant transport device having reversible characteristics in which the refrigerant flows in opposite directions during cooling and during heating, and these are provided in the middle of a connection pipe i which is a multi-liquid pipe.

Reference numerals 13a and 13b denote user-side heat exchangers, which are housed in indoor units g and g ', respectively, and have connection pipes i, i', j, and
j ′ is connected to the outdoor units f and f ′, respectively. 14a and 14b are indoor flow valves and indoor units g and
Adjust the refrigerant flow to g '.

The second auxiliary heat exchangers 9a and 9b, the refrigerant amount adjusting tanks 10a and 10b, and the outdoor flow valves 11a and 11b
, Refrigerant transfer device 12, use side heat exchangers 13a, 13b, indoor flow valves 14a, 14b, and connection pipes i, i ',
j and j 'are connected in a ring to form a use-side refrigerant cycle k.

[0008] The operation of the multi-room air-conditioning apparatus configured as described above will be described below for a cooling operation and a heating operation.

First, consider the cooling operation. The configuration is a refrigerant cycle indicated by a solid line arrow in the figure. In the heat source side refrigerant cycles h and h ′, the high-temperature and high-pressure gas from the compressor 1 is:
The heat is passed through the four-way valve 2 and radiated by the heat source side heat exchangers 3a and 3b to be condensed and liquefied and passed through the check valves 6a and 6b.
The pressure is reduced by a and 4b, evaporated by the first auxiliary heat exchangers 8a and 8b, and circulated through the four-way valves 2a and 2b to the compressors 1a and 1b.

At this time, the second auxiliary heat exchangers 9a and 9b and the first auxiliary heat exchangers 8a and 8b in the use side refrigerant cycle k exchange heat, and the gas refrigerant in the use side refrigerant cycle k is cooled and liquefied. Through the refrigerant amount adjusting tanks 10a and 10b and the outdoor flow valves 11a and 11b,
And the connection pipes i,
j, and is sent to the indoor flow valves 14a, 14b and the use side heat exchangers 13a, 13b to be absorbed and evaporated, gasified, and connected to the second refrigerant cycle k in the use side refrigerant cycle k through connection pipes i ′, j ′.
It is circulated to the auxiliary heat exchangers 9a and 9b.

Next, consider the case of the heating mode. The configuration is a refrigerant cycle indicated by a wavy arrow in the figure. In the heat source side refrigerant cycles h and h ′, the high-temperature and high-pressure gas from the compressor 1 is sent to the first auxiliary heat exchangers 8a and 8b through the four-way valve 2 and radiated. To be condensed and liquefied, passed through the check valves 7a and 7b, and decompressed by the heating decompression devices 5a and 5b.
And is circulated to the compressors 1a and 1b through the four-way valve 2.

At this time, the second auxiliary heat exchangers 9a and 9b and the first auxiliary heat exchangers 8a and 8b in the use side refrigerant cycle k exchange heat, and the gas refrigerant in the use side refrigerant cycle k is heated and gasified. I do.

The gasified refrigerant is supplied to the connection pipe i ′,
j ′, the refrigerant is sent to the use side heat exchangers 13a, 13b, heated, radiated, condensed and liquefied, passed through the indoor flow valves 14a, 14b, the connection pipes i, j, and the refrigerant transfer device 12 in the refrigerant transfer unit, the outdoor flow rate The refrigerant is circulated to the second auxiliary heat exchangers 9a and 9b in the use-side refrigerant cycle k via the valves 11a and 11b and the refrigerant amount adjusting tanks 10a and 10b.

Here, the operation of the refrigerant transfer device 12 is assumed to be constant. The outdoor flow valves 11a and 11b and the indoor flow valve 1
The openings 4a and 14b are adjusted in opening degree from fully open to fully closed so as to circulate the required amount of refrigerant of each unit, and perform an optimum branch flow.

[0015]

However, in the above-mentioned conventional configuration, since there are a plurality of outdoor units f and f ',
Switching of a plurality of outdoor units in the heat source side refrigerant cycle h, h ', that is, when starting a plurality of units (starting while other outdoor units are operating) and when stopping a plurality of units (stopping while other outdoor units are operating) Each time, there is a problem that the fluctuation of the performance is large, and the temperature change of the indoor environment becomes large, which is uncomfortable.

Further, when the capacity fluctuation further increases, the capacity corresponding to the indoor load demand cannot be obtained, so that a plurality of units are started immediately, and the hunting phenomenon is repeated, which significantly lowers the reliability of the compressor 1. At the same time, the energy saving effect is reduced.

In view of the above-mentioned problems, the present invention is provided with outdoor capacity determining means for determining a capacity distribution of the plurality of outdoor units in response to a change in the load of the plurality of indoor units. The signal from the means is received by the outdoor flow valve driving means and the compressor driving means, and the opening of the outdoor flow valve is opened more than a predetermined value.
By opening the outdoor flow valve more than the preset value even when multiple units are stopped, it is possible to prevent a drop in performance caused by a sudden change in performance with a simple configuration, and to improve the indoor environment comfort. Another object of the present invention is to provide a multi-room air-conditioning apparatus capable of realizing energy saving and preventing a decrease in reliability of equipment due to a hunting phenomenon.

[0018]

In order to solve the above-mentioned problems, a multi-room air conditioner of the present invention comprises a compressor, a heat source side heat exchanger, a pressure reducing device, and a first auxiliary heat exchanger connected in a ring shape. A plurality of heat source side refrigerant cycles, a second auxiliary heat exchanger formed integrally with the first auxiliary heat exchanger and exchanging heat, and an outdoor flow valve provided in series with the second auxiliary heat exchanger. An outdoor unit, a plurality of the second auxiliary heat exchangers and the outdoor flow valves provided in each of the outdoor units, and a plurality of use-side heat exchangers provided in each of the indoor units; A use-side refrigerant cycle in which an indoor flow valve and a refrigerant conveying device provided in series with a vessel are connected in a ring shape,
An indoor load detecting means for detecting a load of the plurality of indoor units, an outdoor capacity determining means for receiving a signal from the indoor load detecting means and determining a capacity distribution of the plurality of outdoor units; And a control unit comprising compressor driving means for inputting a signal from the outdoor capacity determining means for inputting a signal from the outdoor flow valve to open and close the outdoor flow valve and for operating the compressor. I have.

[0019]

According to the present invention, there is provided an outdoor capacity judging means for judging a capacity distribution of the plurality of outdoor units in response to a change in the load of the plurality of indoor units by the above-mentioned configuration, and a signal from the outdoor capacity judging means is provided. The flow valve driving means and the compressor driving means receive, for example, at the time of starting a plurality of units, open the opening of the outdoor flow valve more than a predetermined value set in advance,
Similarly, by opening the outdoor flow valve more than a predetermined value when a plurality of units are stopped, it is possible to realize comfort and energy saving in the indoor environment, while reducing the reliability of the device due to a hunting phenomenon. Can be prevented.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the multi-room air conditioner of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a multi-room air-conditioning apparatus according to the present invention, which is almost the same as the conventional example, and only the changes will be described here.

In FIG. 1, reference numeral 15 denotes indoor load detecting means for detecting loads on a plurality of indoor units g and g '.
Reference numeral 16 denotes an outdoor capacity determining unit which receives a signal from the indoor load detecting unit 15 and determines the capacity distribution of the outdoor units f and f '.

Reference numeral 17 denotes an outdoor flow valve driving unit which receives a signal from the outdoor capacity determining unit 16 and adjusts the opening of the outdoor flow valve. At the same time, when a plurality of units are started, the opening of the outdoor flow valve is opened more than a predetermined value, and similarly, when the plurality of units are stopped, the opening of the outdoor flow valve is opened more than a predetermined value. Make settings.

Numeral 18 denotes a compressor driving means for inputting a signal from the outdoor capacity judging means 16 to operate the compressor.
Reference numeral 1 denotes a control unit, which comprises an indoor load detecting means 15, an outdoor capacity determining means 16, an outdoor flow valve driving means 17, and a compressor driving means 18, and performs optimal operation of the outdoor units f and f 'with respect to changes in indoor load. I do.

The operation of the multi-room cooling / heating apparatus of the present embodiment configured as described above will be described with reference to the drawings.

FIG. 2 is a flowchart showing the operation of the control unit 1 of this embodiment for optimal operation of the outdoor unit with respect to changes in the indoor load.

In FIG. 2, in STEP 1, the indoor load detecting means 15 detects the indoor load ratio from a plurality of indoor units g and g ′.

Next, in STEP 2, the outdoor capacity determining means 1
According to 6, the operation pattern of the outdoor units h and h ′ corresponding to the indoor load factor obtained in STEP 1 is determined, and the start and stop of the outdoor unit corresponding to the indoor load are determined.

Here, an operation signal is output to the outdoor flow valve driving means 17 and the compressor driving means 18 which are actually operated.

FIG. 3 shows an operation time chart at this time. In FIG. 3, the horizontal axis is the time axis (t), and the vertical axis is the compressor 1
The dashed line indicates the operation trajectory of the present invention, and the dashed line indicates the maximum performance. As the operation state, the state of the operation of the compressors 1a and 1b, the stop of the compressor 1b (point a), and the starting operation of 1b again (point b) is shown. In the conventional method, when a plurality of vehicles are stopped, the capability temporarily decreases for one vehicle, for example, equivalent to 5 horsepower due to a sudden change in the performance like a broken line. When a plurality of units are started, it takes a long time to reach the maximum capacity, for example, 10 horsepower because the outdoor flow valve is throttled.

Therefore, in this embodiment, when a plurality of units are started and a plurality of units are stopped, the outdoor flow valve opening is set to be larger than the set opening in advance. This will greatly prevent the ability from dropping.

Next, in STEP 3, the operation commands for the outdoor flow valves 11a and 11b are issued based on the operation signals of the outdoor flow valves 11a and 11b determined in STEP 2. Also, STEP
In step 4, as in step 3, an operation command for the compressors 1a and 1b is issued based on the operation signals of the compressors 1a and 1b determined in step 2. Thereafter, this operation is repeated.

As described above, according to this embodiment, the indoor load detecting means 15 for detecting a plurality of indoor loads, the outdoor capacity determining means 16 for determining the outdoor performance of a plurality of vehicles, and the outdoor flow valve driving means are provided. By providing a control unit 1 comprising a compressor unit 17 and a compressor driving means 18, a plurality of indoor units g,
A plurality of outdoor units f, f 'for a change in load of g'
Of the capacity distribution of each of the plurality of outdoor units, that is, the fluctuation of the capacity that occurs each time the plurality of outdoor units are switched, that is, each time the plurality of units are activated and the plurality of units are stopped can be prevented, and the comfort of the indoor environment and energy saving can be realized.

In addition, if the capacity corresponding to the indoor load requirement cannot be obtained even if a plurality of units are once stopped, a hunting phenomenon in which the plurality of units are started immediately can be prevented, so that a decrease in the reliability of the device can be prevented. .

In this embodiment, the number of outdoor units is two, but the same control can be performed with a plurality of outdoor units.

[0036]

As is apparent from the present embodiment, the multi-chamber air conditioner of the present invention comprises a heat source in which a compressor, a heat source side heat exchanger, a pressure reducing device and a first auxiliary heat exchanger are connected in a ring shape. A plurality of outdoor units each having a side refrigerant cycle, a second auxiliary heat exchanger formed integrally with the first auxiliary heat exchanger and exchanging heat, and an outdoor flow valve provided in series with the second auxiliary heat exchanger. And a plurality of the second auxiliary heat exchangers and the outdoor flow valves provided in each outdoor unit, and a plurality of use side heat exchangers provided in each indoor unit, and the use side heat exchanger. A use-side refrigerant cycle in which an indoor flow valve and a refrigerant transfer device provided in series are connected in a ring shape, and an indoor load detecting means for detecting loads on a plurality of the indoor units;
An outdoor capacity determining means for receiving a signal from the indoor load detecting means and determining a capacity distribution of the plurality of outdoor units;
An outdoor flow valve driving means for inputting a signal from the outdoor capacity determining means to open and close the outdoor flow valve, and a compressor driving means for inputting a signal from the outdoor capacity determining means to operate the compressor. And a control unit, provided with outdoor capacity determining means for determining the capacity distribution of the plurality of outdoor units in response to a change in the load of the plurality of indoor units, and transmitting a signal from the outdoor capacity determining means to the outdoor flow valve. The driving means and the compressor driving means receive, for example, when starting a plurality of units, the opening degree of the outdoor flow valve is opened more than a predetermined value set in advance. By opening more than the predetermined value, it is possible to realize the comfort and energy saving of the indoor environment, and to prevent a decrease in the reliability of the device due to the hunting phenomenon.

[Brief description of the drawings]

FIG. 1 is a block diagram of a multi-room air conditioner according to an embodiment of the present invention.

FIG. 2 is a flowchart of the multi-room air conditioner of the embodiment.

FIG. 3 is an operation time chart of the multi-room air conditioner of the embodiment.

FIG. 4 is a refrigeration cycle diagram of a conventional multi-room cooling / heating device.

[Explanation of symbols]

 Reference Signs List 3 heat source side heat exchanger 8 first auxiliary heat exchanger 9 second auxiliary heat exchanger 12 refrigerant transfer device 13 user side heat exchanger 14 indoor flow valve 15 indoor load detecting means 16 outdoor capacity determining means 17 outdoor flow valve driving means 18 Compressor driving means f Outdoor unit g Indoor unit h Heat source side refrigerant cycle k User side refrigerant cycle l Control unit

Claims (1)

(57) [Claims] 1. A heat source side refrigerant cycle in which a compressor, a heat source side heat exchanger, a pressure reducing device and a first auxiliary heat exchanger are connected in a ring shape, and a heat exchange formed integrally with the first auxiliary heat exchanger. A plurality of outdoor units each having a second auxiliary heat exchanger, and an outdoor flow valve provided in series with the second auxiliary heat exchanger;
A plurality of the second auxiliary heat exchangers and the outdoor flow valves provided in each outdoor unit, and a plurality of use-side heat exchangers provided in each indoor unit, are connected in series with the use-side heat exchangers. A user-side refrigerant cycle in which the provided indoor flow valve and the refrigerant transfer device are connected in a ring shape; a plurality of indoor load detecting means for detecting loads of the plurality of indoor units; Outdoor capacity determining means for determining the capacity distribution of the outdoor units, a signal from the outdoor capacity determining means, an outdoor flow valve driving means for opening and closing the outdoor flow valve, and a signal from the outdoor capacity determining means. A multi-room air-conditioning apparatus, comprising: a control unit including a compressor driving means for inputting and operating the compressor.