JPS63318445A - Multizone refrigerant heating type space heating apparatus - Google Patents

Abstract

PURPOSE:To prevent liquid refrigerant from staying in the indoor heat exchanger so as to perform stable operation by causing the compressor to continue its operation to circulate refrigerant gas during a delay time after stopping the indoor unit by holding a valve ahead of the indoor heat exchanger in the open position. CONSTITUTION:A refrigerating cycle is formed by sequentially connecting in a circuit a compressor 1, indoor heat exchangers 2a-2c of, for instance, three indoor units A, B, C which are parallel connected and respectively disposed in a room, and a refrigerant heater 3. A gas/liquid separator 4 is disposed between the compressor 1 and the refrigerant heater 3. The indoor heat exchangers 2a-2c respectively have indoor fans 5a-5c, and the refrigerant heater 3 has a burner 6. Valves 7a-7c are respectively disposed ahead of the indoor heat exchangers 2a-2c, and check valves 8a-8c on their downstream side. The check valves 7a-7c are held open for a certain time interval after the indoor units A, B, C stop the space heating operation, and the compressor 1 continues its operation meanwhile.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a multi-type refrigerant-heating type heating device mainly composed of a compressor, a plurality of indoor units, and a refrigerant heater.

(Prior art) In general, a multi-type air conditioning system consists of a compressor, an outdoor heat exchanger, an expansion valve, and a number of indoor heat exchangers installed in each room, and each room is individually cooled and heated. For example, when the heating and cooling operation of a certain room is stopped (1-), the indoor fan of the corresponding indoor unit is stopped (F-), and at the same time, refrigerant gas flows into the indoor heat exchanger of this indoor unit. It was common practice to ensure that there were no

(Problem to be solved by the invention) As a result, a large amount of refrigerant liquid remains in the indoor heat exchanger of the indoor unit in the room where the cooling/heating operation has been stopped, and if the cooling/heating operation is started in another room in this state, Not only does the residual refrigerant liquid in the indoor heat exchanger that has been shut down greatly affect the temperature and pressure of each part of the refrigeration cycle, leading to unstable operation, but also the amount of residual refrigerant liquid is large. There was a problem in that it caused the compressor to overheat and become inoperable.

For this reason, in conventional multi-type air conditioning systems, the closed indoor unit and the suction side of the compressor are connected with a capillary tube, and the refrigerant is returned through the capillary tube using the pressure difference. was.

However, when applied to a multi-type refrigerant heating type heating device that does not use an expansion mechanism configured by sequentially connecting a compressor, a plurality of indoor heat exchangers, and a refrigerant heater according to the present invention,
Since the pressure difference between the discharge side and the suction side of the compressor is relatively small, it has been difficult to recover the refrigerant that has accumulated on the indoor unit side that has been stopped.

In view of the above, an object of the present invention is to provide a multi-refrigerant heating type heating device that can always operate stably.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the L2 objective, the present invention provides a multi-type refrigerant heating type heating system mainly composed of a compressor, a plurality of indoor units, and a refrigerant heater. , the indoor heat exchangers of each indoor unit are connected in parallel, and an on-off valve is provided on the upstream side of each indoor heat exchanger, and a reversal valve or an on-off valve is provided on the downstream side of each indoor heat exchanger. When the operation is stopped and the indoor fan of the corresponding indoor unit is stopped, the above-mentioned on-off valve on the upstream side of this indoor unit is kept open for a certain period of time, and the above-mentioned compressor is continuously operated during the delay time q. It was designed to let you drive.

(Function) When the indoor unit is stopped, the on-off valve on the first and L flow sides of the indoor heat exchanger of this indoor unit is maintained in an open state, and the compressor is continuously operated during this delay time. By running the indoor unit, the refrigerant gas from the compressor is passed through the indoor heat exchanger of the stopped indoor unit, thereby preventing refrigerant liquid from accumulating in the indoor heat exchanger and ensuring stable operation at all times. This is how it was done.

(Embodiment) The drawing shows an embodiment of the present invention, in which a compressor 1 and a plurality of (three in the illustration) indoor units A, B, and C connected in parallel and placed in each room generate indoor heat. Exchanger 2a, 2
b, 2c and the refrigerant heater 3 are sequentially connected in an annular manner to constitute a refrigeration cycle.

A gas-liquid separator 4 is interposed between the compressor 1 and the refrigerant heater 3 of this refrigeration cycle, and each indoor heat exchanger 2a, 2b, 2c of the L-registered indoor units A, B, and C. are each equipped with an indoor fan 5a.

5b and 5c are provided, and the refrigerant heater 3 described in 1- is further provided with a burner 6.

Furthermore, each indoor heat exchanger 2a, 2b of each indoor unit A, B, C arranged in each room connected in rows in 1-1.
, 2c are provided with on-off valves 7a and 7b on the upstream side.

7c, and on the downstream side there are reverse 11-valves 8a, 8b, 8
c are provided respectively.

Each check valve 7a, 7b, 7c on the upstream side of each indoor heat exchanger 2a, 2b, 2c is connected to each indoor unit A, B.
, C is maintained in an open state for a certain period of time even if the heating operation of the compressors 1 and C is stopped, and the compressor 1 is configured to continue to operate during the time when the compressor 1 is open, that is, during the delay time.

This will be explained based on FIG.

In the figure (A), there are a plurality of indoor units A, for example.

This indicates a state in which the heating operation of one indoor unit A is stopped during the heating operation of indoor unit A. In this case, based on the heating operation stop signal of indoor unit A, the indoor unit The fan 5a is stopped and the combustion amount of the burner 3 is reduced. Then, the on-off valve 7a on the upstream side of the indoor heat exchanger 2a of this indoor unit A is maintained in an open state for a certain period of time, and after this delay time has elapsed, it is closed, and the compressor 1 is allowed to continue operating.

Figure (b) shows the state when the heating operation of indoor unit A is stopped, for example, with only one indoor unit A in heating operation and the other indoor units B and C not in heating operation. In order to stop the indoor fan 5a of the indoor unit A, the indoor fan 5a of the indoor heat exchanger 2a of the indoor unit A is kept open for a certain period of time. and when this delay is 101
After the elapsed time, close it and stop the combustion of burner 3.
− to make. The compressor 1 continues to operate during this delay time, and when the on-off valve 7a closes, the operation is simultaneously stopped.

Incidentally, the flowchart of the above control is as shown in FIG.

In any of the above cases, when the heating operation of one indoor unit A is stopped and the indoor fan 5a is stopped, the refrigerant gas discharged from the compressor 1 remains in the open/close valve 7 without being liquefied for a certain period of time.
Since the refrigerant liquid passes through the indoor heat exchanger 2aG from a, a large amount of refrigerant liquid does not remain in the indoor heat exchanger 2a.

In addition, in the above embodiment, each indoor heat exchanger 2a, 2
Check valves 7a and 7b are provided on the downstream side of b and 2c.

7c is shown, but these check valves 7a, 7
On-off valves are used in place of the on-off valves b and 7c, and the on-off valves on the downstream side are replaced with the on-off valves on the upstream side, respectively.

It is also possible to close them at the same time as 6b and 6c, or with a slight delay.

〔Effect of the invention〕

As described above, when the heating operation of each indoor unit is stopped, the present invention first stops the indoor fan, and after a certain period of time has passed, closes the on-off valve on the upstream side of the indoor heat exchanger. , until this on-off valve closes,
Since the compressor continues to operate, the refrigerant gas from the compressor passes through the indoor heat exchanger without being liquefied. Therefore, after the heating operation ends, no refrigerant liquid remains in the indoor heat exchanger of the stopped indoor unit.
This has the effect of enabling stable heating operation without running out of refrigerant in any case.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; Fig. 1 is a schematic system diagram of a refrigeration cycle, Fig. 2 (a) shows a heating operation in multiple rooms, and Fig. 2 (b) shows a heating operation in one room. FIG. 3 is a control sequence diagram when the heating operation is stopped during the heating operation, and FIG. 3 is a control flowchart. 1... Compressor, 2a, 2b, 2C... Indoor heat exchanger, 3... Refrigerant heater, 5a, 5b, 5c... Indoor fan, 7a, 7b, 7 (-... Open/close valve , 8a, 8b
, 8cm...Check valve, A, B, C...Indoor unit. Applicant's agent Mr. Sato Figure 1 (B) Figure 2

Claims (1)

[Claims] In a multi-type refrigerant heating system that mainly consists of a compressor, multiple indoor units, and a refrigerant heater, each indoor heat exchanger of each indoor unit is connected in parallel, and each indoor heat exchanger is An on-off valve is provided on the upstream side, and a check valve or an on-off valve is provided on the downstream side, and when the heating operation of each indoor unit is stopped and the indoor fan of the corresponding indoor unit is stopped, the above-mentioned upstream side of this indoor unit A multi-type refrigerant heating type heating device characterized in that the on-off valve is maintained in an open state for a certain period of time, and the compressor is continuously operated during this delay time.