JPS5885047A - Ventilation control device for cold insulating type air conditioner - Google Patents

Abstract

PURPOSE:To shorten the period of time of defrosting operation by a method wherein the revolving number of an indoor side fan is lowered when the temperature of a cold insulating agent is lower than a set value upon the defrosting operation under heating operation in the air conditioner having a cold insulating tank in the refrigerating cycle thereof. CONSTITUTION:The closed circuit refrigerating cycle is constituted by connecting a compressor 1, a four-way valve 2, an indoor side heat exchanger 3, a pressure reducing mechanism 5, an outdoor side heat exchanger 6 and the like sequentially, while the cold insulating tank 11, for accumulating cold in the refrigerating cycle, is equipped in the cycle. The cold insulating tank 11 is connected to a refirgerant medium piping through a bypass a bypass circuit 8 detouring the pressure reducing machanism 5, while it is also connected to the refrigerant medium piping at the outlet side of the outdoor side heat exchanger 6 upon room heating through the bypass circuit 16 detouring a solenoid valve 7. In case of the defrosting operation under the room heating operation, the temperature of the cold insulating agent 11a is detected and the revolving number of the fan (not shown in the diagram) in the indoor side unit A is controlled so as to be lowered when the temperaure of the cold insulating agent 11a is lower than a set value.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a cold storage heat storage tank in the refrigeration cycle, and has cooling normal operation, cooling cold storage heat operation, cooling cold storage heat recovery operation, heating normal operation, heating heat storage operation, heating heat storage recovery operation, This relates to a ventilation control device for a cold storage heat type air conditioner that is capable of defrosting operation, and during defrosting operation, if the temperature of the cold storage heat material sealed in the cold storage heat tank is below a set value, the indoor side The fan installed in the unit is controlled to lower its rotation speed, thereby reducing the amount of heat stored in the cold storage tank that is used for indoor heating operation and for defrosting. The purpose of this is to increase the amount of heat used for defrosting and to complete the defrosting operation in a short time.

Conventional cold storage heat type air conditioners of this type keep the blower installed in the indoor unit at the set value even during defrosting operation.
Since it operates continuously at a high rotational speed, a large amount of heat is required for heating operation, and it has the disadvantage that a sufficient amount of heat required for defrosting operation cannot be secured.

The present invention eliminates the above-mentioned conventional drawbacks.

Hereinafter, the present invention will be described with reference to the accompanying drawings showing one embodiment thereof.

First, the refrigeration cycle will be explained with reference to FIG.

In the figure, 1 is a compressor, 2 is a four-way switching valve, 3 is an indoor heat exchanger, 4 is a solenoid valve that controls the flow of refrigerant, 5 is a pressure reduction mechanism, 6 is an outdoor heat exchanger, and 7 is a refrigerant A solenoid valve 8 is a bypass circuit for bypassing the solenoid valve 4 and the pressure reducing mechanism 5, and includes two solenoid valves 9.12 and two pressure reducing mechanisms 10.13. Reference numeral 11 denotes a cold storage heat storage tank for storing cold heat during the refrigeration cycle, in which a refrigerant pipe is arranged, and the surrounding area is filled with a cold storage heat storage material 11a such as water. 14 is a bypass circuit for bypassing the pressure reducing mechanism 5; 15 is a solenoid valve for controlling the flow of refrigerant;
16 is a bypass circuit that bypasses the electromagnetic valve 7, 17 is a pressure reducing mechanism provided in the bypass circuit 16, and 18 is a check valve. The broken unit is the indoor unit, and B is the outdoor unit.

Next, the schematic structure of the indoor UniSotom will be explained with reference to FIGS. 2 and 3.

In the same figure, the indoor unit has an inlet 21 and an outlet 23 on the front as is well known, and has an indoor heat exchanger 3, a blower 2o, a fan for blowing air, and a refrigeration cycle shown in FIG. Each electromagnetic valve 4, 7, 9 controls the flow of refrigerant inside
, 12.15 as well as the operation of the refrigeration cycle having the above configuration will be explained.

First, during normal cooling operation, each solenoid valve 4, 7, 9°12.1
5 is in the state shown in lI & 11 in FIG. Solenoid valve 7
．． Outdoor heat exchanger6. Pressure reducing mechanism 5° solenoid valve 4. Indoor heat exchanger 3. A refrigeration cycle is configured that passes through the four-way switching valve 2 and returns to the compressor 1.

Also, during cooling cold storage heat operation, each solenoid valve 4, 7, 9° 12.1
5 is in the state shown in box 2 of FIG. 4, in which the cold storage heat tank 11 is operated as an evaporator.

In other words, the refrigerant discharged from the compressor 1 is transferred to the four-way switching valve 2.
．． Solenoid valve7. Outdoor heat exchanger6. It passes through the bypass circuit 8, is depressurized by the decompression mechanism 13, and evaporates in the cold storage heat tank 11 and the indoor heat exchanger 3, cooling the indoor area. □At the same time, the cold storage heat material 111L in the cold storage heat tank 11 is cooled, and surplus cold heat is Save up. Then, the refrigerant leaving the cold storage heat tank 11 is transferred to the solenoid valve 9. Indoor heat exchanger 3. It constitutes a refrigeration cycle that passes through the four-way switching valve 2 and returns to the compressor 1.

Also, during cooling storage cold heat recovery operation, each solenoid valve 4,7゜9.12
．． 15 is in the state shown in box 3 of FIG. 4, and operates the cold storage heat tank 11 as a condenser. In other words, compressor 1
The refrigerant discharged from the four-way switching valve 2. Solenoid valve7. Outdoor heat exchanger6. Bypass circuit 8. Solenoid valve 12. It passes through the cold storage heat tank 11 and is condensed in the outdoor heat exchanger 6 and the cold storage heat tank 11, and the outdoor air and the cold storage heat material 111 in the cold storage heat tank 11 are condensed.
It is cooled by the cold energy stored in L. The refrigerant leaving the cold storage heat tank 11 is then transferred to the pressure reducing mechanism 10. Indoor heat exchanger 3
．． A refrigeration cycle is configured that returns to the compressor 1 through the four-way switching valve 2.

Also, during normal heating operation, each solenoid valve 4. Completed, 9°12.15
The control is in the state shown in box 4 in FIG. 2, and the refrigerant discharged from the compressor 1 is controlled by the four-way switching valve 2. Indoor heat exchanger 3
．． Solenoid valve 4. Pressure reduction mechanism 6° outdoor heat exchanger 6. Solenoid valve 7
．． It constitutes a refrigeration cycle that passes through the four-way switching valve 2 and returns to the compressor 1.

Also, during heating heat storage operation, each solenoid valve 4, 7, 9, 12
The control at 16 is in the state shown at 6 in FIG. 2, and the cold storage heat tank 11 is operated as a condenser. In other words, compressor 1
The refrigerant discharged from the four-way switching valve 2° and the indoor heat exchanger 3. Bypass circuit 8. It enters the cold storage heat tank 11 through the solenoid valve 9, condenses in the indoor heat exchanger 3 and the cold storage heat tank 11, heats the indoor side, and simultaneously cools the cold storage heat material 111 in the cold storage heat tank 11.
It exchanges heat with L and stores surplus heat in the cold storage heat material 11a.

The refrigerant leaving the cold storage heat tank 11 is then transferred to the pressure reducing mechanism 13. Outdoor heat exchanger6. Solenoid valve7. It constitutes a refrigeration cycle that passes through the four-way switching valve 2 and returns to the compressor 1.

Also, during heating heat storage recovery operation, each solenoid valve 4, 7, 9°12.
15 is in the state shown in calm 6 in FIG. 2, and the cold storage heat tank 11 is operated as an evaporator.

In other words, the refrigerant discharged from the compressor 1 is transferred to the four-way switching valve 2.
．． Indoor heat exchanger 3. The bypass circuit 8 is passed through, the pressure is reduced by the pressure reducing mechanism 1o, and the cold storage heat tank 11 and the outdoor heat exchanger 6 are
It evaporates in the cold storage heat storage tank 11 and takes heat from the outdoor air and recovers it in the refrigeration cycle.

Then, the refrigerant leaving the cold storage heat tank 11 is transferred to the solenoid valve 12. Outdoor heat exchanger 6° solenoid valve 7. Passing through the four-way switching valve 2, the compressor 1
Configure the refrigeration cycle to return to.

Also, during defrosting operation, each solenoid valve 4. The control at 9, 12 and 16 is in the state shown at 7 in FIG. 2, and the cold storage tank 11 is operated as an evaporator. In other words, the refrigerant discharged from the compressor 1 is transferred to the four-way switching valve 2° indoor heat exchanger 3. Solenoid valve 4. Bypass circuit 14° solenoid valve 16. Outdoor heat exchanger 6
It condenses in the indoor heat exchanger 3 and the outdoor heat exchanger 6, heats the indoor area, and melts the frost that has formed on the outdoor heat exchanger e. The refrigerant leaving the outdoor heat exchanger 6 passes through the bypass circuit 16 and is depressurized by the decompression mechanism 17, and absorbs the heat stored in the cold storage heat tank 11 during the refrigeration cycle.
The evaporated refrigerant is removed from the check valve 18. A refrigeration cycle is configured that passes through the four-way switching valve 2 and returns to the compressor 1.

Here, when the amount of heat required for the amount of heat stored in the cold storage heat tank 11 and the amount of heat required for defrosting the frost on the outdoor heat exchanger 6 cannot be secured sufficiently, the heat amount sealed in the cold storage heat tank 11 is As is well known, the temperature of the cold storage heat material 111L is detected by a thermostat or the like, and depending on the detected temperature, the rotational speed of the blower 10 provided in the indoor unit is lowered stepwise or steplessly, thereby increasing the indoor heating capacity. It is possible to lower the temperature slightly, secure the amount of heat necessary for defrosting, complete defrosting operation in a short time, and continue stable heating operation.

As is clear from the above embodiments, in the air blowing control device for a cold storage heat type air conditioner according to the present invention, the amount of heat stored in the cold storage heat tank during heating operation is If the defrosting operation is insufficient, give priority to the defrosting operation, and at this time, lower the rotation speed of the blower installed in the indoor unit to perform the defrosting operation in a short time. This has the advantage of allowing stable heating operation.

[Brief explanation of drawings]

FIG. 1 is a refrigeration cycle diagram of a cold storage heat type air conditioner equipped with an air blowing control device according to an embodiment of the present invention, and FIGS. FIG. 4, a partially cutaway front view, is an explanatory diagram showing the operating state of a solenoid valve that controls the flow of refrigerant in a refrigeration cycle in the air conditioner. 1... Compressor, 2... Four-way switching valve, 3
...Indoor heat exchanger, 4, 7, 9, 12.15
...Solenoid valve, 6...Outdoor heat exchanger,
8,14.16...Bass pass circuit, 11...
... Cold storage heat tank, 10, 13.17 ... Pressure reduction mechanism, 111L ... Cold storage heat material, 2o ...
Blower. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 8) 1s2 Figure 22 Third cause Figure 4

Claims (1)

[Scope of Claims] A compressor, a four-way switching valve, an indoor heat exchanger, a pressure reduction mechanism, an outdoor heat exchanger, and cold storage heat operation. Bypass circuit for cold storage heat recovery operation and defrosting operation,
A refrigeration cycle is configured by connecting a cold storage heat tank 11 filled with a cold storage heat material 111L'i, a pressure reduction mechanism, and a plurality of solenoid valves for controlling the flow of refrigerant, and defrosting operation during heating operation using the refrigeration cycle is performed. At times, the temperature of the cold storage heat material is detected, and if the temperature of the cold storage heat material is below a set value, the rotation speed of the blower installed in the indoor unit is lowered. Air blow control device.