JPH01247977A - Cold heat reserving type refrigerator - Google Patents

Abstract

PURPOSE:To utilize reserved refrigerating capacity effectively, by a method wherein a heat transfer route is provided between a main evaporator and a cold heat reserving material to supply refrigerant to the main evaporator through a refrigerant flow passage and dissipate cold heat from the cold heat reserving material to the main evaporator through the heat transfer route simultaneously. CONSTITUTION:The delivery side 1a of a compressor 1 is connected to one end of a condenser 3 through a delivery pipe. The other end of the condenser 3 is connected to the inflow side 13a of a main evaporator 13 through a differential pressure valve 5, a main solenoid valve 9 and a main capillary tube 11 sequentially. The outflow side of the differential pressure valve 5 is connected to the inflow side 19a of a cold heat reserving evaporator 19, around which a cold heat reserving material 18 is arranged, through a cold heat reserving solenoid valve 15 and a cold heat reserving capillary tube 17 sequentially. Cold heat dissipation is effected as far as the temperature of the cold heat reserving material 18 is low enough to contribute to the cooling of the inside of the tank. Accordingly, the inside of a refrigerating chamber may be cooled quickly when normal cooling operation and cold heat reserving and cooling operation are effected simultaneously.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a cold storage refrigerator.

(Prior Art) A conventional cold storage type refrigerator is provided with a cold storage evaporator surrounded by a cold storage material, and has a refrigerant flow path that can be switched from the compressor to the main evaporator and the cold storage evaporator. In addition, a heat transfer path consisting of, for example, a thermosiphon was provided between the main evaporator and the cool storage evaporator. The heat transfer path between the main evaporator and the cool storage evaporator can be opened and closed by opening and closing a solenoid valve arranged in this path.

A fan for circulating cold air inside the refrigerator is installed near the main evaporator.

This cold storage refrigerator had the following three operating modes corresponding to certain time periods of the day. FIG. 4 is a diagram showing operating modes of a conventional regenerator refrigerator according to time of day.

That is, for example, time zones A and 1 from 9:00 to 13:00
The time period A2 from 6:00 to 21:00 is a normal cooling operation mode, in which the refrigerant flow path from the compressor is switched to the main evaporator side, and the compressor is operated to supply liquid refrigerant to the main evaporator. When the fan is driven while supplying liquid refrigerant to the main evaporator in this manner, the interior of the refrigerator is cooled.

The time slot B1 from 0:00 to 8:00 and the time slot B2 from 22:00 to 24:00 are modes in which normal cooling operation and cold storage operation are alternately executed. That is, the cold storage operation is performed while the normal cooling operation is stopped, and the cold storage material is stored in the cold storage material while the normal cooling operation and the cold storage operation are alternately repeated. For example, the normal cooling operation time is 23 minutes, and the cold storage operation time is 9 minutes.

Cold storage is achieved by cutting off the heat transfer path between the main evaporator and the cold storage evaporator, switching the refrigerant flow path from the compressor to the cold storage evaporator, and operating the compressor to supply liquid refrigerant to the cold storage evaporator. It is done. At this time, the operation of the fan is stopped. Then, normal cooling operation and cold storage operation are repeated alternately.
For example, if the temperature of the cold storage material detected by the cold storage Eva sensor is -29
The completion of cold storage is detected when the temperature reaches ℃, and after that, only normal cooling operation is performed.

Time zone C2 from 01:00 to 16:00 and time zone C3 from 21:00 to 22:00 are from 8:00 to 9:00.
A cold storage cooling operation mode is executed in which the heat transfer path between the main evaporator and the cold storage evaporator is opened while the operation of the compressor is forcibly stopped. At this time, cooling is released from the cold storage material arranged around the cold storage evaporator to the main evaporator. If the fan is operated while discharging cooling from the cool storage material in this manner, the inside of the refrigerator will be cooled even though the compressor is not operating.

(Problems to be Solved by the Invention) In the conventional cold storage type refrigerator described above, the temperature rise of the cold storage material during cold storage cooling operation is small, especially when the room temperature outside the refrigerator is low. In some cases, the refrigeration capacity stored in the cold storage material could not be fully utilized, and about half of the refrigeration capacity was wasted.

In addition, in the normal cooling operation mode, for example, if the door is opened and closed frequently or if high-temperature items are stored in the refrigerator, not only will the compressor operating rate increase, but the compressor will The refrigerating capacity of the liquid refrigerant supplied to the refrigerator was insufficient, and the temperature inside the refrigerator sometimes rose excessively.

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a cold storage type refrigerator that solves the above problems by effectively utilizing the refrigeration capacity stored in the cold storage material during cold storage operation. do.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides heat transfer between the main evaporator and the cold storage material in addition to the refrigerant flow path from the compressor to the main evaporator. A path is provided, and the refrigerant is supplied to the main evaporator through the refrigerant flow path, and at the same time, coolant is released from the cold storage material to the main evaporator through the heat transfer path.

(Function) The main evaporator in the refrigerant refrigerator of the present invention receives refrigerant supply from the compressor and at the same time receives coolant radiation from the regenerator material, so the refrigerating capacity is improved compared to the case where refrigerant is only supplied from the compressor. .

(Example) FIG. 1 is a configuration diagram of a regenerator refrigerator according to an example of the present invention.

A discharge side 1a of the compressor 1 is connected to one end of the condenser 3 via a discharge pipe. The other end of the capacitor 3 is connected to the inflow side 11a of the main evaporator 13 via the differential pressure valve 5, the main electromagnetic valve 9, and the main capillary tube ti in this order. Further, the outflow side of the differential pressure valve 5 is connected to the inflow side 19 of the cold storage evaporator 19 around which the cold storage material 1B is arranged through the cold storage solenoid valve 15 and the cold storage capillary tube 17 in sequence.
connected to a.

The outflow side 19b of the cold storage evaporator 19 is connected to the inflow side 13a of the main evaporator 13. The outflow side 13b of the main evaporator 13 is connected to the suction side tb of the compressor 1 via an accumulator 21 and a check valve 23 in this order. This pressure on the suction side 1b is applied to the differential pressure valve 5. Furthermore, the main evaporator 13 and the cold storage evaporator 1
For example, a gravity-type closed-loop thermosiphon 25 is provided as an independent heat transfer path between the thermosiphon 25 and the cooling electromagnetic valve 27 . A fan 29 for circulating cold air inside the refrigerator is located near the main evaporator 13.
A cold storage evaporator 19 is provided with a cold storage evaporator 33 for detecting the temperature of the cold storage material 18 .

FIG. 2 is a block diagram of the control circuit of the above regenerator refrigerator.

F sensor 3 provided to detect the temperature inside the freezer compartment
The output of 1 is input to the control circuit 35 together with the output of the cold storage evaporator sensor 33. Moreover, this control circuit 35
It controls the operation and stopping of the compressor 1 and the fan 29, and also controls the opening and closing of the main solenoid valve 9, the cold storage solenoid valve 15, and the cold release solenoid valve 27.

FIG. 3 is a diagram showing the daily operation mode of the regenerator refrigerator according to the embodiment of the present invention described above.

During time period B1 from 0:00 to 8:00 and time period B2 from 22:00 to 24:00, normal cooling operation and cold storage operation are performed alternately as in the past, and cold storage is performed while cooling the inside of the refrigerator. Cool storage is performed in the material 18. Normal cooling operation is performed by closing the cold storage solenoid valve 15, opening the main solenoid valve 9, and driving the compressor to supply liquid refrigerant to the main evaporator 13 while operating the fan 29. The cold storage operation is performed by closing the main solenoid valve 9, opening the cold storage solenoid valve 15, and driving the compressor to supply liquid refrigerant to the cold storage evaporator 19. The operation of the fan 29 is stopped during cold storage.

From 0113 o'clock from 8 o'clock to 9 o'clock! During the time period C2 until 16:00 and the time period C3 from 21:00 to 22:00, the cooling solenoid valve 27 is opened while the operation of the combination leg 1 is forcibly stopped as in the conventional case. Thereby, cooling is released from the cold storage material 18 to the main evaporator 13 through the thermosiphon 25. At this time, the refrigerant circulates within the thermosiphon 25 due to the temperature difference between the main evaporator 13 and the cold storage material 18 surrounding the cold storage evaporator 19 and the action of gravity, so power is supplied from the outside for cooling. There's no need to. In the cold storage cooling operation mode in which the fan 29 is operated while discharging cold from the cold storage material 18 in this manner, the inside of the refrigerator is cooled even though the compressor is not operating.

In the time period A1 from 9:00 to 13:00 and the time period A2 from 16:00 to 21:00, the normal cooling operation and the cold storage cooling operation are performed simultaneously. Normal cooling operation is during time periods B and B.
Similarly to the above case, this is done by closing the cold storage solenoid valve 15 and opening the main solenoid valve 9, driving the compressor 1 to supply liquid refrigerant to the main evaporator 13, and driving the fan 29. In this normal cooling operation, the temperature inside the freezing chamber detected by the F sensor 31 is a predetermined temperature T. It is activated when the temperature becomes higher than N, and continues until the temperature falls below a predetermined temperature T, which is lower than this temperature "ON." On the other hand, the storage FF cold cooling operation is performed in the same way as in time periods C, C, and C3.
This is done by opening the cooling solenoid valve 27 and operating the fan 29 while releasing the cooling from the cold storage material 18.

In this cold storage cooling operation, the temperature of the cold storage material 18 detected by the cold storage evaporator sensor 33 is a predetermined temperature T in the freezing chamber, which is the starting condition for the normal cooling operation. When the temperature reaches N, the cooling solenoid valve 27 is closed and stopped. After the cold storage cooling operation is stopped due to the temperature rise of the cold storage material 18, only the normal cooling operation is performed until the next cold storage is performed.

In the cold storage type refrigerator according to the embodiment of the present invention described above, although the time slots for the cold storage cooling operation are set to C9C and C3, even in other time slots, the cold storage material 18
Cooling is performed as long as the temperature is low enough to contribute to internal cooling. Therefore, when the normal cooling operation and the cold storage cooling operation are executed at the same time, the inside of the freezer compartment is rapidly cooled and the indoor temperature becomes below T in a short time, so that the operating time of the FF compressor I is shortened. In addition, when the cold storage cooling operation is executed while the normal cooling operation is stopped, the temperature rise in the freezer compartment is suppressed, and the time it takes for the indoor temperature to reach "ON" becomes longer, so the operating rate of the compressor l decreases. In addition, even if the door is opened and closed frequently during normal cooling operation, or if high-temperature items are stored in the refrigerator, the refrigerating capacity of the main evaporator 13 can be supplemented, and the temperature inside the refrigerator can be increased. Excessive temperature rise can be prevented.Furthermore, since the temperature of the cold storage material 18 detected by the cold storage evaporator sensor 33 is used as the condition for stopping the cold storage cooling operation in time periods A and A2 as described above, all of the cold storage material 18 is The refrigeration capacity can be used to cool the inside of the refrigerator.

In the embodiment described above, the heat transfer path between the main evaporator 13 and the cold storage evaporator 19 is a gravity-type closed-loop thermosyphon 25.
Although it is not necessary to supply power from the outside for cooling, other means such as a heat vibrator may be used to configure this heat transfer path. In the above description, the main solenoid valve is used as a flow path switching means for switching between the refrigerant flow path from the compressor to the inflow side 13a of the main evaporator 13 and the other refrigerant flow path from the compressor to the inflow side 19a of the cold storage evaporator 19. Although two solenoid valves, the solenoid valve 9 and the cold storage solenoid valve 15, are used, one three-way solenoid valve may be used instead.

[Effects of the Invention] As explained above, the present invention provides a heat transfer path between the main evaporator and the regenerator material separately from the refrigerant flow path from the compressor to the main evaporator. At the same time, the cooling capacity of the liquid refrigerant supplied from the compressor to the main evaporator is stored in the cold storage material in the so-called normal cooling operation mode. This can be supplemented by additional refrigeration capacity. Therefore, while it is possible to effectively utilize the refrigerating capacity stored in the cold storage material, it is also possible to prevent an excessive rise in temperature inside the refrigerator and reduce the operating rate of the compressor during normal cooling operation, thereby realizing energy savings. Can be done. Additionally, it is possible to downgrade the compressor's performance.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a cold storage refrigerator according to an embodiment of the present invention,
Figure 2 is a block diagram of the control circuit of the previous cold storage refrigerator.
FIG. 3 is a diagram showing the operating mode of the regenerator refrigerator shown in FIG. 1 according to the time of day, and FIG. 4 is a diagram showing the operating mode of the conventional regenerator refrigerator according to the time of day. Explanation of symbols l...Compressor, 9...Main solenoid valve, 13...
Main evaporator, 15... Solenoid valve for cold storage, 18...
Cold storage material, 19... Evaporator for cold storage, 25... Thermosiphon, 27... Solenoid valve for cooling, 29... Fan, 31... F sensor, 33... Cold storage evaporator. 1 other person

Claims (1)

[Claims] 1. In addition to the refrigerant flow path from the compressor to the main evaporator, a heat transfer path is provided between the main evaporator and the cold storage material, and at the same time the refrigerant is supplied to the main evaporator through the refrigerant flow path, the refrigerant is supplied to the main evaporator through the heat transfer path. A cold storage type refrigerator characterized in that cold storage material is released to the main evaporator.