JPS6116896B2 - - Google Patents

Description

Detailed Description of the Invention The present invention has a cold storage heat tank in the refrigeration cycle,
An auxiliary heat source during defrosting operation of a cold storage heat air conditioner capable of normal cooling operation, cooling cold storage heat operation, cooling cold storage heat recovery operation, normal heating operation, heating heat storage operation, heating heat storage recovery operation, and defrosting operation. This is related to the operation control method, and in particular detects the temperature of the cold storage material in the cold storage tank, the amount of frost on the outdoor heat exchanger, and the temperature and pressure in the refrigeration cycle to detect the auxiliary heat source that heats the cold storage material. The purpose of this is to perform control to start or stop the system, to always ensure the amount of heat necessary for defrosting operation and for heating the indoor area during defrosting operation, and to obtain stable operation.

Conventional cold storage heat type air conditioners of this kind do not have enough room to store the heat from the refrigeration cycle in the cold storage heat tank when the indoor load or outdoor load is large during defrosting operation. The disadvantage was that the heat stored in the heating system could not be used for defrosting, and stable heating operation could not be continued.

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 first control solenoid valve that controls the flow of refrigerant, 5 is a main pressure reducing mechanism, 6 is an outdoor heat exchanger, and 7 is a second control solenoid that controls the flow of refrigerant. Valve 8 is a first bypass circuit for bypassing the first control solenoid valve 4 and the main pressure reducing mechanism 5, and includes two bypass solenoid valves 9, 12, the first and second.
and the first and second two bypass pressure reducing mechanisms 10, 1
It is equipped with 3. Reference numeral 11 denotes a cold storage heat tank for storing cold heat during the refrigeration cycle, in which refrigerant piping is arranged, and the surrounding area is filled with a cold storage heat material 11a such as oil.
An auxiliary heat source 11b is provided. 14 is a second bypass circuit for bypassing the main pressure reducing mechanism 5; 15 is a third bypass solenoid valve for controlling the flow of refrigerant; and 16 is a bypass circuit for bypassing the second control solenoid valve 7. a third bypass circuit, 17 a third pressure reducing mechanism provided in the third bypass circuit 16;
18 is a check valve. In the figure, reference numeral 19 indicates an electromagnetic fuel control valve, A indicates an indoor unit, and B indicates an outdoor unit.

FIG. 2 shows the first and second control solenoid valves 4, 7 and the first to
FIG. 7 is a mode diagram showing the operations of the third bypass solenoid valves 9, 12, and 15 corresponding to each operation.

In the above configuration, during normal cooling operation, each solenoid valve 4, 7, 9, 12, 15 is controlled by No. 1 in FIG.
Proceed as shown. Therefore, the refrigerant discharged from the compressor 1 is transferred to the four-way switching valve 2, the second control solenoid valve 7, the outdoor heat exchanger 6, the main pressure reducing mechanism 5, the first control solenoid valve 4, and the indoor heat exchanger. A refrigeration cycle is constructed in which the compressor 1 returns to the compressor 1 through a four-way switching valve 2 and a four-way switching valve 2.

Also, during cooling cold storage heat operation, each solenoid valve 4, 7,
Controls 9, 12, and 15 are performed as shown in No. 2 of FIG. Therefore, the cold storage heat tank 11 is operated as an evaporator. In other words, the refrigerant discharged from the compressor 1 passes through the four-way switching valve 2, the second control solenoid valve 7, the outdoor heat exchanger 6, and the bypass circuit 8, and is depressurized by the second bypass decompression mechanism 13, storing cold heat. It evaporates in the tank 11 and the indoor heat exchanger 3, cools the indoor side and at the same time cools the cold storage heat material 11a in the cold storage heat tank 11,
Stores excess cold storage heat. The refrigerant leaving the cold storage heat tank 11 passes through the first bypass electromagnetic valve 9, the indoor heat exchanger 3, and the four-way switching valve 2, and returns to the compressor 1, forming a refrigeration cycle.

Furthermore, during cooling storage cold heat recovery operation, each solenoid valve 4,
7, 9, 12, and 15 are controlled as shown in No. 3 in FIG. 2, and the cold storage heat tank 11 is operated as a condenser. That is, the refrigerant discharged from the compressor 1 passes through the four-way switching valve 2, the second control solenoid valve 7, the outdoor heat exchanger 6, the bypass circuit 8, the second bypass solenoid valve 12, the cold storage heat tank 11, It is condensed in the outdoor heat exchanger 6 and the cold storage heat tank 11, and is cooled by the outdoor air and the cold storage heat stored in the cold storage heat material 11a in the cold storage heat tank 11. The refrigerant leaving the cold storage heat tank 11 returns to the compressor 1 through the first bypass decompression mechanism 10, the indoor heat exchanger 3, and the four-way switching valve 2, forming a refrigeration cycle.

Also, during normal heating operation, each solenoid valve 4, 7, 9, 1
Controls 2 and 15 are performed as shown in No. 4 in FIG. Therefore, the refrigerant discharged from the compressor 1 passes through the four-way switching valve 2, the indoor heat exchanger 3, the first control solenoid valve 4, the pressure reducing mechanism 5, the outdoor heat exchanger 6, and the second control solenoid valve 7. , passes through the four-way switching valve 2, and connects to the compressor 1, forming a refrigeration cycle.

Furthermore, during heating heat storage operation, each solenoid valve 4, 7, 9,
12 and 15 are controlled as shown in No. 5 in FIG. 2, and the cold storage heat tank 11 is operated as a condenser.
That is, the refrigerant discharged from the compressor 1 passes through the four-way switching valve 2, the indoor heat exchanger 3, the first bypass circuit 8, and the first bypass solenoid valve 9, and then passes through the cold storage heat tank 11.
The heat is condensed in the indoor heat exchanger 3 and the cold storage heat tank 11, heats the indoor area, and at the same time exchanges heat with the cold storage heat material 11a in the cold storage heat tank 11, and transfers the heat to the cold storage heat material 1.
Store in 1a. The refrigerant leaving the cold storage heat tank 11 is transferred to the second
A refrigeration cycle is configured that passes through the bypass pressure reducing mechanism 13, the outdoor heat exchanger 6, the second control solenoid valve 7, and the four-way switching valve 2 to the compressor 1.

Furthermore, during heating heat storage recovery operation, each solenoid valve 4,
7, 9, 12, and 15 are controlled as shown in No. 6 of FIG. 2, and the cold storage heat tank 11 is operated as an evaporator. That is, the refrigerant discharged from the compressor 1 passes through the four-way switching valve 2, the indoor heat exchanger 3, the first bypass circuit 8, and the first bypass pressure reducing mechanism 1.
It is depressurized at 0, evaporates in the cold storage heat tank 11 and the outdoor heat exchanger 6, removes heat from the heat stored in the cold storage heat tank 11 and the outdoor air, and recovers it in the refrigeration cycle. The refrigerant leaving the cold storage heat tank 11 is transferred to the second
bypass solenoid valve 12, outdoor heat exchanger 6, second
The compressor 1 passes through the control solenoid valve 7 and the four-way switching valve 2.
It constitutes a refrigerating cycle.

Also, during defrosting operation, each solenoid valve 4, 7, 9, 12,
The control of No. 15 is performed as shown in No. 7 of Fig. 2,
The cold storage heat tank 11 is operated as an evaporator. That is, the refrigerant discharged from the compressor 1 is transferred to the four-way switching valve 2, the indoor heat exchanger 3, the first control solenoid valve 4, the second bypass circuit 14, and the third bypass solenoid valve 1.
5, passes through the outdoor heat exchanger 6 and passes through the indoor heat exchanger 3
It is condensed in the outdoor heat exchanger 6, heats the indoor area, and melts the frost formed on the outdoor heat exchanger 6. The refrigerant that has exited the outdoor heat exchanger 6 passes through the third bypass circuit 16 and is depressurized by the third bypass decompression mechanism 17, and absorbs the heat stored in the cold storage heat tank 11 during the refrigeration cycle. It evaporates and passes through the check valve 18 and the four-way switching valve 2 to the compressor 1, forming a refrigeration cycle. However, when defrosting operation is performed using the amount of heat stored in the cold storage heat tank 11, if the amount of heat required for indoor heating and defrosting of the frost on the outdoor heat exchanger 6 cannot be secured, Detecting the temperature of the cold storage heat material 11a in the cold storage heat tank 11 or the temperature and pressure during the refrigeration cycle, and operating the auxiliary heat source 11b provided in the cold storage heat tank 11 a certain set time before starting the defrosting operation, By storing a sufficient amount of heat in the cold storage heat material 11a, stable heating operation can be ensured. The temperature detection means and the pressure detection means will not be explained as they may be conventionally known techniques, and the electric circuit can detect, for example, the temperature or pressure in the existing refrigeration cycle, or the amount of frost on the outdoor heat exchanger. A frost formation detection means detects the necessity of defrosting operation by detecting the temperature inside the cold storage heat storage tank, an internal temperature detection means detects the temperature inside the cold storage heat storage tank, and the frost formation detection means outputs a defrosting required signal to detect the need for defrosting operation inside the tank. A timer that operates when the temperature detection means outputs a signal below a set temperature, a heating output means that operates an auxiliary heat source for a set time based on the operation of the timer, and a defrosting output means that outputs a defrosting operation signal after the set time of the timer has elapsed. may be configured by appropriately combining them.

Therefore, if the load on the indoor side or the load on the outdoor side is large during heating operation, sufficient heat cannot be stored in the cold storage tank by thermal storage operation alone.
In that case, by operating the auxiliary heat source 11b, the amount of heat for heating can be secured in the cold heat storage material, and stable heating operation can be performed.

As is clear from the above embodiments, the method for controlling the operation of a cold storage heat type air conditioner according to the present invention includes a compressor, a four-way switching valve, an indoor heat exchanger, a main pressure reducing mechanism,
Equipped with an outdoor heat exchanger, cold storage heat operation,
A refrigeration cycle is constructed by connecting a bypass circuit for cold storage heat recovery operation and defrosting operation, a cold storage heat tank having an auxiliary heat source 11b, a pressure reduction mechanism, and a solenoid valve, and during heating operation using the refrigeration cycle, When performing defrosting operation, the temperature of the cold heat storage material in the cold storage heat tank and the amount of frost on the outdoor heat exchanger or the temperature and pressure in the refrigeration cycle are detected, and the temperature of the cold heat storage material is set to a certain value. If it is below this value, it is possible to operate the auxiliary heat source that heats the cold storage material in the cold storage tank a certain amount of time before the start of defrosting operation, and to secure the amount of heat in the heat storage material for defrosting operation. In addition to cooling and heating using heat pumps,
When the indoor load or outdoor load is large during heating operation, when sufficient heat cannot be stored in the cold storage tank by thermal storage operation alone, heating can be performed in the cold storage material by operating an auxiliary heat source. It has the advantage of being able to secure a sufficient amount of heat for the heating operation, and allowing for more stable heating operation to continue.

[Brief explanation of the drawing]

FIG. 1 is a refrigeration cycle diagram of a cold storage heat type air conditioner according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing the operation of a solenoid valve that performs the operation control method of the cold storage heat type air conditioner. . DESCRIPTION OF SYMBOLS 1... Compressor, 2... Four-way switching valve, 3... Indoor heat exchanger, 4... First control solenoid valve, 5... Main pressure reducing mechanism, 6... Outdoor heat exchanger, 7... ...Second control solenoid valve, 8...First bypass circuit, 9...
First bypass solenoid valve, 10... First bypass pressure reduction mechanism, 11... Cold storage heat storage tank, 11a... Cold storage heat material, 11b... Auxiliary heat source, 12... Second bypass solenoid valve, 13... Second bypass pressure reduction mechanism, 1
4... Second bypass circuit, 15... Third bypass solenoid valve, 16... Third bypass circuit, 17
...Third pressure reduction mechanism.

Claims (1)

[Claims] 1 Equipped with a compressor, four-way switching valve, indoor heat exchanger, main pressure reducing mechanism, outdoor heat exchanger, bypass circuit and auxiliary heat source for cold storage heat operation, cold storage heat recovery operation, and defrosting operation. A refrigerating cycle is constructed by connecting a cold storage heat tank, a pressure reducing mechanism, and a solenoid valve, and defrosting is performed by detecting the temperature or pressure within this refrigerating cycle, or the amount of frost on the outdoor heat exchanger. A frost formation detection means detects whether or not operation is necessary, a tank temperature detection means detects the temperature in the cold storage heat tank, the frost formation detection means outputs a defrosting required signal, and the tank temperature detection means A timer that operates when a signal equal to or lower than a set temperature is output, a heating output means that operates an auxiliary heat source for a set time based on the operation of the timer, and a defrosting output means that outputs a defrosting operation signal after the time set by the timer has elapsed. , when performing a defrosting operation during heating operation using the refrigeration cycle, the temperature of the cold storage heat material in the cold storage heat exchanger and the amount of frost on the outdoor heat exchanger or the temperature inside the refrigeration cycle;
The pressure is detected, and if the temperature of the cold storage heat material is below a certain set value, the auxiliary heat source that heats the cold storage heat material in the cold storage heat tank is operated before the set time to start defrosting operation, and the defrosting operation is started. A method for controlling the operation of a cold storage type air conditioner that makes it possible to secure the amount of heat for the cold storage heat in the cold storage heat material.