JPS59109761A - Refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (a) Field of the Invention An auxiliary cooler is provided in the freezing chamber, and the air cooled by the main cooler installed in the cooling chamber is directly cooled by the refrigerator chamber internal using a blower to perform normal cooling. This invention relates to a refrigeration system that cools down in a shorter time than it takes to operate.

(B) Background technology and its problems Air that is cooled by a cooler stored in a cooler room between the compartments is equipped with a freezer compartment and a refrigerator compartment, and is circulated from the freezer compartment to the refrigerator compartment using a blower, and is directly cooled to the wall of the freezer compartment. A method in which a type cooler is installed so that refrigerant flows in series between both coolers, the operation of the blower is controlled according to the temperature of the refrigerator compartment, and the operation of the electric compressor is also stopped when the temperature of the freezer compartment is reached, thereby stopping the operation of the refrigerator. The one is from 1974-386.
It is publicly known from Publication No. 18. However, in this case, the operation of the electric compressor is stopped during the defrosting operation, and it is not possible to prevent the temperature of the freezer compartment from rising during the defrosting operation.

It also has a freezer compartment and a refrigerator compartment, and the freezer compartment is equipped with a direct cooling type cooler on its inner wall, and a blower circulates the air cooled by another second cooler installed in the cold air circulation path to the freezer compartment. Normally, only when defrosting is performed by flowing hot gas into the second cooler, the refrigerant is passed through the direct cooling type cooler to cool the freezer compartment. Japanese Patent Publication No. 52-44825 discloses a system in which a cooler is provided to cool the refrigerator independently of the freezing chamber. With this method, it is possible to suppress the temperature rise in the freezer compartment while the second cooler is defrosting, but two coolers are required for the freezer compartment, and three coolers are required for the refrigerator-freezer. It becomes expensive. In addition, the electric compressor continues to operate until the compartments in the freezer and refrigerator compartments are sufficiently cooled, and when the temperature in the refrigerator compartment reaches a predetermined low temperature, the blower is stopped and the second cooler is heated. Since the system defrosts the air by flowing gas and stops the operation of the electric compressor when the freezer reaches a predetermined temperature, it is difficult to control the temperature in consideration of the defrosting of each cooler.

(c) Purpose of the invention A refrigerant circuit that achieves rapid cooling operation and normal cooling operation by providing an auxiliary cooler in a freezing chamber, which improves cooling operation efficiency and prevents extension of defrosting time. This prevents an increase in the amount of heat generated by the frost heater, and further reduces the capacity of the electric compressor and improves start-up performance.

B) Examples of the invention will be explained with reference to the drawings. In Figure 1, (1) is a so-called two-temperature refrigerator, which has a freezer compartment (3) kept at freezing temperature by a partition wall (2), and a refrigerator compartment (3) kept at a temperature higher than the freezing point. 4) It is divided into two parts. (5) is a freezer compartment (3) located above the partition wall (2) with a distance between it.
A main cooler (7) is installed in a cooling chamber (6) formed between the bottom wall and the partition wall (2). (8) sends the air cooled by the main cooler (7) to the freezer compartment (3) and refrigerator compartment (4).
A blower (
Cold air is directly discharged from the front of the refrigerator compartment (8), and the cold air that has descended through the duct (9) is sent to the refrigerator compartment (4) and circulated as shown by the arrow. (6) is a damper device that opens and closes the cold air discharge port of the duct (9) to the refrigerator compartment (4) according to the temperature of the refrigerator compartment (4). αη is an electric compressor, (6) is a condenser, and (c) is, for example, a so-called roll bond type in which a refrigerant passage is formed between two metal plates, or a so-called chie in which a refrigerant pipe is arranged in a metal plate in a thermally conductive manner. The auxiliary cooler is a tube-on-sheet type cooler, and in this embodiment, it is provided in the freezer compartment (3) in the form of a shelf on which articles are placed. In Figure 2,
(c) is a three-way solenoid valve as a passage control valve device that controls whether or not the refrigerant that exits the condenser flows to the auxiliary cooler (to), and the capillary on the inlet side of the auxiliary cooler (2) Open and close the refrigerant passage between the tube (E) and the condenser (6).

(C) is a three-way solenoid valve that functions as a refrigerant passage control valve on the inlet side of the main cooler (7), and is a cabillary chest (holster) whose inlet is connected to the refrigerant passage between the condenser (6) and the solenoid valve. ) and the main cooler (7). (2) is a check valve that is connected to the communication pipe 6p that flows the refrigerant from the auxiliary cooler (to) to the main cooler (7), and is connected to the connecting pipe 6p that flows the refrigerant from the auxiliary cooler (c) to the main cooler (
7), the refrigerant passage is opened and the refrigerant passage is closed against the flow in the opposite direction. A check valve installed in the refrigerant passage between the accumulator αe and the inlet side of the electric compressor (b) opens the refrigerant passage in the suction direction of the electric compressor αυ and prevents the flow of refrigerant in the opposite direction. do. The wires are the outlet side of auxiliary coolers a and 3 and the main cooler (7)
A dam part (1) bent upward is formed near the connection part with the communication pipe Gη near the outlet side of the auxiliary cooler (to) with the bypass pipe connected to the outlet side of the capillary tube (c). It has an inner diameter smaller than the inner diameter of the refrigerant vibrator other than (e) to stabilize the rapid cooling operation described below.

In Fig. 3, 2) is a temperature controller that essentially controls the temperature of the freezer compartment (3), and normally senses the temperature of the freezer compartment (3) or the temperature of the circulating cold air passage to the freezer compartment (3). or by sensing the temperature of the cooler (7). (C) is a defrosting timer and has a cam switch (33B) that is operated by the rotation of an electric motor (3:3A).

(Foundation) is a thermo cut for detecting the defrosting end temperature of the cooler (7). (2) is a defrost relay switch (35A)
(35B) (35C) (35D) (35E). (to) is a quenching timer and has a cam switch (36B) operated by the rotation of an electric motor (36A). (B) is a quenching command switch, and eel is a quenching relay switch (38A)
(38B) has (38C). 0 song quench stop switch, 2) is the power supply. θ→ is a delay operation timer, (6) is a power transformer, and (g) is a transformer (6) 2.
The rectifier circuit for DC voltage output connected to the next side is a comparator circuit, and one reference input line (S) is connected to a resistor (C) (
(8) is connected to the other measurement input line (8).
The integral output of the integrating circuit consisting of the resistor O'7) and the capacitor (C) is input to the circuit. θ is a relay that is excited by the output of the comparator circuit and closes the switch (49A).

In this configuration, under normal cooling operation conditions, the relay θ flaw is excited and the switch (49A) is closed, and the switches (35A) (35C) of the relay (2) are closed (35B) (3
5D) (35E) is open, switches (38A) (38B) (38C) of relay) are open, switch (33B) of timer (g) is closed to contact (5), thermo stand (c) is closed at a temperature below approximately 0℃, switch (b) is open and (a) is closed, and the timer (
The switch (36B) is closed. Therefore, when the temperature controller (A) is closed, the electric compressor θ'D and the electric blower (8) are operated, and the solenoid valve (C) is energized to open the refrigerant passage. Since the is closed, the refrigerant is transferred to the electric compressor αD - condenser condenser - 2 - capillary tube) - solenoid valve (c) - main cooler (7) - accumulator (1! 19 - check valve (c) - electric compressor It is sequentially circulated to the machine α1) to cool the freezer compartment (3) and refrigerator compartment (4).

The defrosting timer motor (33A) is energized during the closing time of the temperature regulator (a) and performs an integration operation. The resistance value of the electric motor (33A) is sufficiently larger than the resistance value of heater 0Q, so heater 0
Q is a state in which substantially no heat is generated. When the temperature controller (a) detects a predetermined lower limit temperature setting, it opens, relay 00 becomes de-energized, electric compressor αD and electric blower (8) stop, and solenoid valve Q4 becomes de-energized, closing the refrigerant passage. . When the temperature in the freezer compartment rises and the temperature controller () detects the upper limit set temperature, the contact closes and power is applied to the transformer (6), the rectifier circuit (■) generates a DC output, and the capacitor ((G)) begins to charge and the reference input line (When the potential of the measurement input line reaches the potential of Sl, the output of the comparison circuit is generated, the relays θ are energized, the switch (49A) is closed, and the electric compressor (1)
1) starts. On the other hand, as soon as the temperature control device (a) is closed, the solenoid valve is energized to open the refrigerant passage, the electric blower (8) is started, and the timer motor (33A
) starts. That is, the electric compressor (1, 1) starts with a delay from the energization of the solenoid valve (c) and the like. This delay time is relatively short, ranging from a few tens of seconds to a few minutes in a home-use refrigerator/freezer, and the rise in temperature of the main cooler (7) has never been significant, so the negative effects of the rise in internal temperature are almost no problem. do not have. Even in one experiment, good results can be obtained with this delay time of about 30 seconds to 3 minutes. In this way, by starting the electric compressor 0), the main cooler (7) is cooled by the above-mentioned refrigerant circuit, and the freezer compartment and refrigerator compartment are cooled. The temperature of the refrigerator compartment (4) is maintained within a constant temperature range by the damper thermostand 91.

When the defrost timer (to) reaches the predetermined integration value, the switch (3
3B) switches to the contact (Bl), so the relay (c) is energized and opens the switch (35A) (35C) (35B)
(35D) To close (35E), electric blower (8
) stops, the solenoid valve (C) is de-energized and closes the refrigerant passage, and the solenoid valve (C) is energized to open the refrigerant passage and start the electric motor (
33A, ) is short-circuited and stops operating, and the electric compressor 0 power continues to operate.

Therefore, the refrigerant is transferred from the electric compressor αη to the condenser 0 solenoid valve (
C) - Cavillary archive (C) - Auxiliary cooler α - Bypass 1fH - Accumulator 0υ - Electric compressor (B)
The refrigerant passage is configured so that the temperature of the freezer compartment (3) is approximately controlled by a temperature control device and kept at a low temperature below the lower limit temperature. Then, the heater (A) is energized to defrost the main cooler (7). The main cooler (7
) rises by -L and reaches, for example, 10°C, the thermostand ■ opens, so the relay ) becomes de-energized and the switch (35A) (35C) closes (35B) (35D
) (35E) is opened and the defrosting operation due to the heat generated by the heater α0 is completed. During the defrosting operation, the auxiliary cooler lowers the temperature below the lower limit temperature of the freezer compartment when controlled by the temperature control device, so at the end of the defrosting operation, the temperature control device If a) is open, the electric compressor (b) will stop,
Further, if a low temperature close to the lower limit set temperature is detected, the electric compressor (b) continues to operate and the temperature control device (a) opens at a predetermined lower limit set temperature. If the temperature control device cover is closed after defrosting, the timer motor (33A) is released from the short circuit by the switch (35B), so it is energized and the switch (33B) is turned on after a predetermined time-safe period of several minutes.
) returns to the contact point (5), so the electric blower (8) starts. Further, the solenoid valve (c) is de-energized to close the refrigerant passage, and the solenoid valve (c) is energized to open the refrigerant passage and perform normal cooling operation.

Note that the thermostat closes when the temperature of the main cooler (7) drops to about 0°C during this cooling operation.

Next, when the self-returning type rapid cooling command switch (b) is temporarily closed, the relay) is energized and the switch (38A) (38
B) (38C) is closed, IJ L/- (c) is self-holding, energizes the quenching timer motor (36A), and forms a continuous cooling operation circuit that short-circuits (to the temperature controller), and further connects to the solenoid valve board. Turn on the power and open the refrigerant passage. For this reason, the condenser (6)
The refrigerant that exits the capillary chevron and the electromagnetic valve which is a parallel circuit to it - to the capillary chevron) - to the auxiliary cooler a
It flows through the path of the ladle-check valve (a), flows from the solenoid valve (c) to the main cooler (7), and returns to the electric compressor aη for circulation. Therefore, food placed on the auxiliary cooler (2) can be frozen in a short time by direct cooling by the auxiliary cooler (c) and indirect cooling by cold air passing through the main cooler (7). .

This quick freezing ends when the switch (36B) opens after the time set by the timer. When the switch (36B) opens, the self-holding of the relay (c) is released and the switch (36B) is released.
8A) (38B) (38C) open and the solenoid valve board becomes de-energized, closing the refrigerant passage to the auxiliary cooler (c). After the rapid freezing operation is completed, the normal cooling operation state is resumed.

Cancellation of rapid freezing in the middle can be achieved by temporarily opening the self-recovery type switch (c).

The quenching timer (g) returns to its initial state at the end of the set time and when the switch (to) is opened. Further, a capillary tube (c) may be provided at the point P in FIG. 3 and at the outlet of the condenser (b). Also, the check valve handle is powered by an electric compressor αη.
In the case of a rotary type compressor, this is necessary because the pressure is not separated between the discharge side and the suction side of the compressor, but in the case of a reciprocating type compressor, the pressure is separated, so it may be omitted.

In the above normal cooling operation, when the electric compressor (b) stops, the solenoid valves (4) and (c) are closed, so the high pressure side and the low pressure side of the refrigerant circuit remain separated. Therefore, the high temperature refrigerant in the condenser @ is transferred to the main cooler (7) and the auxiliary cooler α1.
There is no possibility of heat loss from flowing into the air.

In addition, during defrosting operation, the solenoid valve (c) is closed, so the refrigerant in the condenser (6) does not flow into the main cooler (7) and prolong the defrosting time, and the defrosting time is shortened. There is no need to increase the wattage of the defrost heater (g) to do so. In addition, in the quick freezing state, the electromagnetic valves (C) and (C) open and the water flows into both coolers (7) C13, so that the food on the auxiliary cooler U can be quickly frozen.

In addition, the presence of the check valve ensures that the refrigerant flows to the auxiliary cooler 03 during defrosting operation.
2) can be fully demonstrated. A three-way solenoid valve is installed at point P in place of the solenoid valve (e), and when the current is not energized, the flow path to the auxiliary cooler (to) is closed and the flow is directed toward the main cooler (7), that is, toward the capillary tube (1). The refrigerant passage to the main cooler (7) may be opened by energization, and the refrigerant passage toward the main cooler (7) may be closed, and the refrigerant passage to the auxiliary cooler (to) may be opened. It is also within the scope of the present invention to replace the positions of the electromagnetic valve plate and the capillary tube bracket with respect to the flow direction of the refrigerant in the refrigerant circuit shown in FIG.
E) may be placed between point Q and the solenoid valve (F), and the capillary cheep (E) may be placed between the solenoid valve (C) and the main cooler (F).
7) is within the scope of the present invention. Further, the present invention has similar functions and effects even when applied to a freezer.

(j→ Effects of the invention The freezing chamber can be brought into a rapid freezing state, and the action of the check valve ensures that the refrigerant flows to the auxiliary cooler during defrosting operation, so that the auxiliary cooler is able to maintain sufficient flow during the defrosting operation. It can maintain a low temperature and prevent the ice cream from becoming soft.Furthermore, when the electric compressor stops, the solenoid valve closes the refrigerant passage, so the high pressure side and low pressure side of the refrigerant circuit are pressure-separated, and the ice cream is removed from the condenser. Heat loss caused by high-temperature refrigerant flowing into the main cooler and auxiliary cooler is prevented, which is good for maintaining the temperature inside the refrigerator.Also, since the electric compressor starts slightly later than the opening of the solenoid valve, the pressure in the refrigerant circuit increases. It can be configured to start when the transition to balance is achieved, improving the startability of the electric compressor and making it possible to use an electric motor for a small-capacity electric compressor.Also, during defrosting operation, the high-temperature refrigerant in the condenser is Since it does not flow into the main cooler, there is no need to increase the capacity of the defrosting heater, and the disadvantage of a long removal time is also solved.

[Brief explanation of the drawing]

Each figure shows an embodiment of the present invention (~, Figure 1 is a vertical side view of a refrigerator-freezer, Figure 2 is a refrigerant circuit diagram, and Figure 3 is a control circuit diagram. (3)... Freezer compartment , (7)...Main cooler, (8
)...Electric blower, α's...Electric compressor, (6
)...Condenser, (to)...Auxiliary cooler, El
&41...Control valve, (b)@...Gearpilary cheep, Kan...Check valve, ni)...Temperature control device,
θυ...timer. Figure 1 Figure 2 811 Figure 3 Tsuni 1 3

Claims (1)

[Claims] 1. In a device in which air cooled by a main cooler installed in a cooling chamber is circulated to a freezer compartment using a blower, an auxiliary cooler installed to directly cool the inside of the freezer compartment, and an auxiliary cooler installed to directly cool the inside of the freezer compartment; a temperature control device that controls the operation of the electric blower and the electric compressor to perform temperature control; and a temperature control device that controls the operation of the electric blower and the electric compressor to control the temperature of the electric blower; A first refrigerant circuit flows to the cooler, and in the defrosting operation of the main cooler, the refrigerant exiting the condenser flows through the auxiliary cooler through a second control valve and a second capillary tube to the main cooler. The second flow to the outlet side of the vessel
a refrigerant circuit, and in a quick freezing operation, the refrigerant exiting the condenser passes through the second control valve and the second capillary tube, flows through the auxiliary cooler, and then passes through the communication line including a check valve. a third refrigerant circuit that flows upstream of the first control valve and flows through the main cooler after passing through the first control valve; and a third refrigerant circuit that flows through the main cooler after passing through the first control valve; A refrigeration system comprising a control circuit that closes a refrigerant passage, and a timer that controls the start of the electric compressor to be delayed slightly from the opening of the refrigerant passage of the control valve.