JPS61231377A - Cold accumulation type 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 (Field of Industrial Application) The present invention relates to a cold storage type refrigerator-freezer that maintains a cold effect even after the refrigeration cycle has stopped, and is used in vehicles such as wagons that are mainly used for leisure purposes. It is suitable for this purpose.

(Prior art) Conventionally, as a cold storage type refrigerator for a vehicle, Japanese Patent Application Laid-Open No. 59-5',
As described in Publication No. 082.8, the cold storage material (water, etc.) in the cold storage device is cooled and frozen by an evaporator branched from the refrigeration cycle of the vehicle cooling system, and this frozen cold storage material is used to cool the cold storage material (water, etc.) when the vehicle is parked. A type of refrigerator that can keep the inside of the refrigerator at a low temperature for a long period of time has been proposed.

(Problem to be Solved by the Invention) However, since the above-mentioned conventional product only uses a single regenerator, the cooling temperatures for freezing and refrigeration are different (for example, -10°C and 0°C). Two effects could not be obtained.

The present invention has been made in view of the above points, and an object of the present invention is to provide a cold storage type refrigerator-freezer that can obtain freezing and refrigeration functions with an extremely simple configuration and can freely select between independent operation and simultaneous operation of freezing and refrigeration. With the goal.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides (a) a freezer compartment having a door that can be opened and closed; (b) a refrigerator compartment having a door that can be opened and closed; c) a freezing cold storage body installed in the freezing chamber; (d) a freezing evaporator installed in the freezing chamber to cool the freezing cold storage body; (e)
(f) a refrigerating cold storage body installed in the refrigerator compartment and having a higher freezing temperature than the freezing cold storage body; a refrigerating evaporator provided in parallel with the evaporator; (gl) valve means for controlling the flow of refrigerant to the refrigerating evaporator and the refrigerating evaporator; and (h) electrically controlling the opening and closing of the valve means. A technical means is adopted in which the system is equipped with a control circuit that controls the system.

(Function) According to the above technical means, the freezing temperature of the cold storage material of the cold storage body for refrigeration is set to a higher temperature (for example, 0°C) compared to the freezing temperature of the cold storage material of the cold storage body for freezing (for example, -11°C). Because of this setting, after the freezing of both cold storage bodies is completed, the pressure of the refrigeration cycle is 8.
Even if the compressor is stopped, the freezing and refrigerating compartments can each be maintained at a low temperature near the above-mentioned freezing temperature for a long period of time, and the freezing and refrigeration functions of each cold storage body can be satisfactorily exhibited.

In addition, by controlling the opening and closing of the valve means by the control circuit and independently controlling the flow of refrigerant to the freezing evaporator and the refrigeration evaporator, the freezing function and the refrigeration function can be operated independently or simultaneously. can be selected. - (Example) Hereinafter, the present invention will be explained based on an example shown in the drawings. FIG. 1 shows an automobile refrigeration cycle for cooling a vehicle interior and refrigerating articles, and a compressor 21 is connected to a drive shaft of an automobile engine (not shown) via an electromagnetic clutch 20. In this example, the compressor 21 uses a 10-cylinder swash plate compressor, of which 9 cylinders are configured as a main compression section 21a for cooling, and the remaining 1 cylinder is configured as a sub-compression section 21b for refrigerating and freezing. It consists of in this case,
Each of the compressor sections 21a and 21b of the compressor 21 is independently provided with an air-conditioning suction port 21e and a refrigerating/freezing suction port 21f, so that each compression section can independently set a different suction pressure. It has become. Moreover, the main compression section 21a for cooling and the sub-compression section 21b for refrigerating and freezing are communicated with each other by a communication passage 21d, and the refrigerants (R12) having different pressures are sucked from the respective suction ports 21a and 21f.
Before being compressed in each compression part 21a, 21b, the communication path 21
d, and after being raised to the pressure of the cooling refrigerant, it is compressed in each of the compression sections 21a and 21b, and is discharged to the outside of the compressor from a common discharge port 21c.

Next, the specific configuration of the compressor 21 is shown in FIGS. 2 and 3.
To explain with a diagram, the compressor 21 of this embodiment uses a swash plate 211 to transfer the rotational force of a shirt 210 driven by an automobile engine via an electromagnetic clutch 20 to a piston 210.
The swash plate 211 is keyed to the shaft 210 and rotates together with the shaft 210. Rotation of the swash plate 211 is transmitted to the piston 212 via the sheath 213 and the ball 214. There are five Novistons 212, and their surfaces are coated with a resin material such as Teflon. - These pistons 212 are disposed in five cylinder bores (one pore 216 is shown in FIG. 2) formed in the cylinder block 215 so as to be able to reciprocate in the axial direction. Both end surfaces of the piston 212 are cylinder pores 216
In cooperation with 10 cylinders (cylinder chambers) 217.217
One cylinder 217a among these 10 cylinders constitutes the compression section 21b for freezing and refrigerating in FIG. 1, and the remaining cylinders 217 constitute the compression section 21a for cooling. A shaft hole for the shaft 210 and a swash plate chamber 218 that accommodates the swash plate 211 are formed in the center of the cylinder block 215.
communicates with the cylinder bore 216. On the other hand, an oil chamber 219, which is normally filled with lubricating oil, is also formed in the lower part of the cylinder block 215.

On both end faces of the cylinder block 215, an annular pulp plate 220 and a suction valve 22 formed of an elastic metal plate are provided.
1, end plates 222 and 223 are attached, and these parts 215, 220, 221, 222, and 223 are fastened to each other by through bolts 224. Five suction boats 225 are formed on each of the left and right pulp plates 220 and 220, and these suction ports 225 can communicate with ten cylinders 217 and 217a through suction valves 221, respectively. .

Both end plates 222 and 223 have the same structure, but one end plate 222 is formed with a refrigerating/freezing inlet 21f, which is a sub-inlet, and the other end plate 223 is formed with a shaft 21.
They differ from each other in that they have a central hole 226 through which 0 rotatably passes. Both end plates 222 and 223 have a dish-like shape, and each has a substantially circular partition wall 227 on its inner surface.
．． 228 is bored in the axial direction, and this partition wall 227.22
8 is the discharge chamber 229, and the partition wall 2
A suction chamber 231 is formed between 27 and 228 and the outer peripheral wall of each end plate 222 and 223. The end plate 222 has a partition wall 233 different from the partition wall 227, and this partition wall 233
It also differs from the end plate 223 in that it partitions the sub-suction chamber 234 from the suction chamber 231 (see FIG. 3). The refrigeration/freezing suction port 21f is opened in the sub suction chamber 234.

This sub-suction chamber 234 communicates with the cylinder 217a via a suction port 225 corresponding to the cylinder 217a,
The eye chamber 231, on the other hand, communicates with all remaining cylinders 217. The left and right pulp plates 220, 220 are provided with five discharge boats 235 corresponding to the five cylinders, and these discharge boats 235 are opened and closed by discharge valves (not shown), and when opened, the discharge chamber 22
It connects to 9. This discharge chamber 229 is connected to the passage 23 in FIG.
6, it communicates with the discharge port 21C in FIG.

As is clear from the above explanation, 1. One cylinder 217a that can communicate with the sub-suction chamber 234 constitutes a sub-compression section 21b for freezing and refrigeration, and the other nine cylinders 217 constitute a main compression section 21a for cooling. The cooling suction port 21e, which is the main suction port, is provided at the upper part of the outer peripheral surface of the cylinder block 215, as shown in FIG. 2, and communicates with the swash plate chamber 218 by a structure described later. The swash plate chamber 218 communicates with the left and right suction chambers 231 through passages formed by gaps between the through bolts 224 and the bolt holes 2 and 24a. Therefore, the refrigerant flowing into the suction chamber 231 from the swash plate chamber 218 passes through the suction port 225 and is suctioned into all cylinders 217 except the cylinder 217a. On the other hand, the refrigerant flowing into the sub-suction chamber 234 from the refrigerating/freezing suction port 21f passes through the suction port 225 corresponding to the cylinder 217a and is sucked into the cylinder 217a, that is, the sub-compression section 21b.

In order to communicate the cooling inlet 21e with the swash plate chamber 218, the cylinder bore 216 is provided with a cylinder bore 2 on the inner surface thereof.
A communication groove 237 is formed in the axial center of the cylinder pore 216 and extends circumferentially over a portion around the piston 212 within the cylinder pore 216 . This communication groove 237 directly opens into the swash plate chamber 21B, and also communicates with the cooling intake port 21e via a communication hole (not shown).

Note that the discharge port 21C (FIG. 1) of the compressor 21 is provided at the upper part of the outer surface of the cylinder block 215 in line with the cooling suction port 21e, but is not shown in FIG. This discharge port 21C is connected to a discharge chamber 229.2 in the left and right end plates 222.223 through a passage 236 shown in FIG.
It communicates with 29.

The communication path 21d shown in FIG.
A circumferential annular groove 23 is formed on the inner peripheral surface of the cylinder 217a over the entire circumference at a position near the bottom dead center of the piston 212 in the cylinder 217a.
8, and this groove 238 is connected to the swash plate chamber 21 through a plurality of axial communication holes 239 that are formed in the circumferential wall of the cylinder 217a surrounding the piston 212 and spaced apart from each other in the circumferential direction.
8 and the communication groove 237 at all times. Therefore, the piston 212 in the cylinder 217a moves in the direction of arrow G in FIG. When the cylinder 217a reaches the vicinity of the dead center and opens the circumferential annular groove 238 to the cylinder 217a, the low-pressure refrigerant for cooling flows from the groove 237 and the swash plate chamber 218 to the communication hole 239 and the annular groove 238 forming the communication path 21d. The refrigerant flows through the cylinder 217a and mixes with the low-pressure refrigerant for refrigeration and freezing in this cylinder. Here, if the pressure of the low-pressure refrigerant for refrigeration and freezing is 0.5 kg/cm" and the pressure of the low-pressure refrigerant for cooling is 2.0 kg/cm", then the low-pressure refrigerant for cooling is introduced into the cylinder 217a through the communication passage 21d. When it flows in and mixes with the low pressure refrigerant for refrigeration and freezing, this cylinder 217
The pressure of the refrigerant in a is equal to the pressure at the start of compression in the other cylinder 217 constituting the main compression section 21a, that is, 2.0
kg/cm". Therefore, the cylinder 21
The compression stroke in 7a starts at almost the same pressure as the compression start pressure of the other cylinders 217, and the compressed refrigerant is discharged into the common discharge chamber 229 and joins with the refrigerant discharged from the other cylinders 217, and the compressed refrigerant is discharged into the common discharge chamber 229 and joins with the refrigerant discharged from the other cylinders 217. through the outlet 2 in Figure 1.
Black is discharged from 1c toward the condenser 22.

Therefore, the refrigerant compression section 21b for refrigeration/freezing can be compressed by the piston from the same pressure state as the cooling compression section 21a. Comparatively, it saves power.

In addition to the swash plate type multi-cylinder compressor 21 as described above, a vane type compressor can also be used. In that case, if the refrigerating/freezing suction port 21f and the cooling suction port 21e are opened in order of decreasing suction pressure along the rotational direction of the rotor, the respective compression sections 21b and 21a will all have the highest suction pressure of 2.0 k. It is now possible to start compression in a state where the speed is 100 cm. As mentioned above, the compression sections 21a and 21b of the compressor 21 of this embodiment are provided with independent suction ports 2Le and 21f, making it possible to independently set the suction pressure of each compression section. Become.

The discharge port 21C of the compressor 21 is connected to a condenser 22 as shown in FIG. 1, and the discharge side of the condenser 22 is connected to a receiver 23. On the discharge side of the receiver 23, a cooling pressure reducing device, in this example a hot coal-operated expansion valve 24, and a cooling evaporator 25 connected thereto are provided, and on the air upstream side of the evaporator 25, Cooling air blower fin 5
0 is placed. The refrigerant outlet side of the evaporator 25 is connected to the cooling suction port 211 of the compressor 21 by the cooling suction pipe 45.
Connected to 3.

On the other hand, □ a constant pressure expansion valve 27 which is a specific example of a pressure reducing device for refrigeration; a refrigeration evaporator 28 and a refrigeration The evaporator 32 is connected to the cooling expansion valve 24 and the evaporator 2
5 in parallel. The freezing evaporator 28 and the freezing cold storage body 29 cooled by the freezing evaporator 28 are installed in the freezing compartment 7, which will be described later.
4, and the refrigerating evaporator 32 and the refrigerating cold storage body 31 cooled by the refrigerating evaporator 32 are installed in the refrigerating compartment 75, which will be described later.
is installed inside. The outlet of the refrigeration evaporator 28 and the refrigerating evaporator 32 are connected by piping to a check valve 33 that allows refrigerant gas to pass only in one direction toward the compressor suction side. The discharge side of the compressor 33 is connected to the refrigeration/refrigeration suction port 21f of the compressor 21 through a refrigeration/refrigeration suction pipe 46 . Note that the constant pressure expansion valve 2
7, the downstream pressure thereof, that is, the refrigerant pressure of the freezing evaporator 28 and the refrigerating evaporator 32, is the set pressure, for example, 0.5 kg
/cmz or less, the valve opens and this set pressure is maintained.

A communication pipe 47 is provided between the cooling suction pipe 45 and the refrigerating/freezing suction pipe 46, and a solenoid valve 48 is provided in the communication pipe 47.
When the valve is opened, the suction pipes 45 and 46 are brought into communication.

Next, the electric circuit of this embodiment will be explained.

In FIG. 1, reference numeral 1 denotes an on-vehicle battery, and a cooling control circuit 3 is connected to this battery 1 via a cooling switch 2. As shown in FIG. 15 is a freezing/refrigeration control circuit, which is connected to the batch IJ"1 via the cooling switch 2. 9 is a freezing switch, which is connected to the control circuit 15. 4 is a refrigeration switch, which is connected to the batch IJ"1 through the cooling switch 2. 15. Reference numeral 6 denotes a temperature sensor provided on the air outlet side of the cooling evaporator 25, which is made of a thermistor and is connected to the cooling control circuit 3.This temperature sensor 6 is connected to the cooling evaporator 25. In order to prevent freezing of the evaporator, the resistance value increases when the evaporator outlet temperature falls below the set temperature, and the cooling control circuit 3 senses this change in resistance value and turns off the power to the electromagnetic clutch 20.
The compressor 21 is stopped.

7 is a temperature sensor provided to detect the surface temperature of the refrigerating regenerator 31 cooled by the refrigerating evaporator 32; 11 is a temperature sensor installed to detect the surface temperature of the refrigerating regenerator 29 cooled by the refrigerating evaporator 28; Both of these temperature sensors 7 and 11 are composed of thermistors, and their detection signals are input to the control circuit 15.

8 is a cold storage completion indicator light for refrigeration that lights up when cold storage in the cold storage body 31 for refrigeration is completed, 12 is a cold storage completion indicator light for refrigeration that lights up when cold storage in the cold storage body 29 for refrigeration is completed, and 8a5 is a cold storage completion indicator light when the refrigeration switch 4 is turned on. The refrigeration operation indicator light 12a that lights up is a refrigeration operation indicator light that lights up when the refrigeration switch 9 is turned on. The control circuit 15 opens and closes the solenoid valves 44, 48, 49 and the indicator lights 8.8a, 12 in response to the detection signal of the two temperature sensors 71.11 and the opening and closing of the two switches 4.9.
．． This is to control the lighting and extinguishing of the light 12a.

In addition, switch 4.9 and indicator lights 8.12.8a, 1
2a is installed on the outer surface of the refrigerator case, which will be described later.

Next, a specific structure of a vehicle refrigerator-freezer having the above-mentioned freezing evaporator 28 and refrigeration evaporator 32 will be explained. 4 and 5 illustrate the specific structure of a refrigerator-freezer for a vehicle, and the refrigerator-freezer 60 in this example is a so-called double-walled refrigerator using a double resin member 61 made of polyethylene or polypropylene. Wall structure approach 6
It has 2. Furthermore, a heat insulating material 63 such as hard polyurethane is injected between the double wall structures to improve heat insulation properties. The refrigerator-freezer 60 has a freezer door 68 which, like the case 61, combines a double-walled resin member 64, 65 and a heat insulating material 66, 67 such as hard polyurethane.
A refrigerator door 69 is connected to the center cover 72 of the refrigerator-freezer 60 by hinges 70 and 71 so as to be freely openable and closable, and a rubber member (not shown) containing a magnet is provided around the upper end of the case 62. This rubber member is securely attracted and fixed by magnetic force to an iron plate (not shown) fixed to the periphery of the door 68, 69.

The interior of the case 62 is partitioned into a freezer compartment 74 and a refrigerator compartment 75 by a flat partition member 73 having the same insulation structure as the case 62. The lower end of this partition member 73 is fitted into the groove 76 of the case 62, while the upper end is pressed and held by the central cover 72. The center cover 72 can be assembled by screwing screws (not shown) into mounting holes 77 (FIG. 5) provided on the upper end surface of the case 62.
The partition member 73 is fixed to the case 62 while pressing the upper end thereof.

In FIG. 5, for convenience in drawing, the constant pressure expansion valve 27, branch pipe 50, and solenoid valves 44 and 49 are shown in the case 62.
Although shown externally, these devices are actually 27.44
．． 49.50 is disposed in the case 62 together with the check valve 33 (not shown in FIG. 5), and the solenoid valve 44
．． In this example, the freezing evaporator 28 and the refrigeration evaporator 32, which are adjacent to each other on the downstream side of the evaporator 49, are composed of flat multi-hole tubes (hereinafter referred to as tubes) 28a and 32a as shown in the figure, and these tubes 28a and 32a are It is arranged along the inner surface of the case 62 so as to surround the freezer compartment 74 and the refrigerator compartment 75 . The tubes 28a and 32a are made of a material such as aluminum.

And inside the tube 28a of the freezing evaporator 28,
A freezing cold storage body 29 is disposed so as to be in close contact with this, and in this example, the cold storage body 29 is made of a large number (for example, 5 pieces) of an easily deformable bag made of aluminum foil with a cold storage material sealed inside. Cold storage bags are placed side by side. The cold storage material of the freezing cold storage body 29 has a eutectic point (freezing temperature) of -11°C, for example.
A 19.7% eutectic solution of potassium chloride is used. Furthermore, a refrigerating regenerator 31 is disposed in close contact with the inside of the tube 32a of the refrigerating evaporator 32, and this refrigerant regenerator 31 also has a large number of regenerator packs arranged side by side in the same way as the refrigerant regenerator 29 described above. However, since water is used as the cold storage material of the cold storage body 31, its freezing point is 0°C.

After arranging the evaporator 28.32 and the cold storage body 29.31 as described above, a cooling plate 78.79 made of a metal with excellent thermal conductivity such as aluminum or stainless steel is placed further inside the cold storage body 29.31. It is disposed in close contact with the cold storage bodies 29 and 31. As shown in FIG. 4, the cooling plate 78 for refrigeration is formed into a box-like shape with only the upper surface open, and the portion near the upper end is connected to the case 62 and the partition member 7 by screws 80.
3, the tightening is fixed. Also, cooling plate 7 for refrigeration
9 is formed into a mouth shape with open upper and lower surfaces, and a portion near the upper end thereof is fastened to the case 62 and the partition member 73 by screws 80.

The temperature sensor 7 that detects the temperature of the refrigerating regenerator 31 described above is connected to the refrigerating regenerator 31 located at the most downstream side of the tube 32a of the refrigerating evaporator 32 and the cooling plate, as shown in FIG. 79 and is closely fixed. Similarly, the temperature sensor 11 that detects the temperature of the refrigerating regenerator 29 is tightly fixed between the refrigerating regenerator 29 located at the most downstream side of the tube 28a of the refrigerating evaporator 28 and the cooling plate 78. ing.

Next, the operation of this embodiment will be explained. FIG. 6 is a Moller diagram of a refrigeration cycle, and the cycle indicated by the solid line 90 in the figure is
The operating characteristics of the refrigeration cycle for cooling are shown, and the dashed line 91
shows the operating characteristics of a refrigeration cycle for freezing and refrigeration.

When the cooling switch 2 is turned on, power is supplied to the cooling control circuit 3. However, when the cooling starts, the temperature of the air blown from the cooling evaporator 25 is higher than the set temperature (for example, 3°C), so the control circuit 3 turns on the temperature sensor 6. The detection signal is compared with the reference signal, and a "Hi" level output is output to energize the electromagnetic clutch 20. Then, the electromagnetic clutch 20 becomes connected, and the driving force of the automobile engine is transmitted to the compressor 21.
The compressor 21 rotates and compresses refrigerant gas.

In the above state, if the refrigeration switch 4 is turned on again,
The freezing and refrigeration control circuit 15 operates, but at the time of startup, the surface temperature of the refrigeration regenerator 31 is higher than the set temperature (for example, -3°C), so the control circuit 15 compares the detection signal of the temperature sensor 7 with the reference signal. According to the output, the refrigeration solenoid valve 49
Open the valve.

In addition, the control circuit 15 energizes the solenoid valve 48 and
Close. At the same time, the control circuit 15 turns on the refrigeration operation indicator light 8a, and keeps the refrigeration cold storage completion indicator light 8 off. Further, when the refrigeration switch 9 is further turned on in the above state, a closing signal for the switch 9 is applied to the control circuit 15, but since the surface temperature of the refrigeration regenerator 29 is higher than the set temperature (for example, -15°C) at the time of startup, Control circuit 15
compares the detection signal of the temperature sensor 11 and the reference signal,
The output causes the refrigeration solenoid valve 44 to open, the refrigeration operation indicator light 12a to light up, and the refrigeration cold storage completion indicator light 12 to remain off.

As described above, when the solenoid valve 48 is closed, the cooling refrigerant from the cooling suction pipe 45 flows through the main suction port 21e of the compressor 21.
Furthermore, the refrigerant for refrigerating and freezing from the suction pipe 46 for refrigerating and freezing is independently sucked into the auxiliary suction port 21f of the compressor 21.

Here, as described above, the refrigerating/freezing compression section 21b of the compressor 21 is connected to the communication path 21b at the end of the suction stroke (near the bottom dead center).
1d to the cooling compression section 21a, the pressure inside the refrigerating/freezing compression section 21b is the same as that on the cooling side, i.e. 2.0, due to the inflow of refrigerant from the cooling compression section 21a.
kg/cm" (P in Fig. 6 → P3). Therefore, the recompression parts 21a and 21b both have a weight of 2.0 kg7.
cm" pressure is compressed (Ps-P4 in FIG. 6).

This compressed refrigerant gas is mixed with the discharge port 21.
c and is cooled by the condenser 22 (P in Figure 6).
4→pt).

This liquefied refrigerant is stored in the receiver 23, and the constant pressure expansion valve 2
7 and temperature-operated expansion valve 24, the pressure is reduced (p+
→P, and P+-Pg), then the evaporator 28.32
and evaporation (Ps→P, and P
8→P, ), where 23 points represent the state of the high-pressure refrigerant on the inlet side of the temperature-activated expansion valve 24, P2 represents the state of the refrigerant on the discharge side of the expansion valve 24, and P3 represents the state of the refrigerant on the discharge side of the expansion valve 24. P4 represents the state of the refrigerant at the suction port 21e of the compression section 21a
represents the state of the refrigerant at the discharge port 21c. The refrigerating cycle t sets the state of the refrigerant downstream of the constant pressure expansion valve 27 to Ps by appropriately setting the opening pressure of the constant pressure expansion valve 27. Specifically, the evaporation pressure of the evaporator 28゜32 is reduced to 0.5 kg/cm by the action of the constant pressure expansion valve 27.
"It is possible to maintain the evaporation pressure in the evaporator 28.32 for freezing and refrigeration to 0.5 kg/cm or more"
By maintaining the refrigerant temperature at -21° C., it is possible to perform refrigeration and freezing operations.

Here, to explain the refrigeration and freezing effects in detail, the first
In the refrigeration cycle shown in the figure, the refrigeration evaporator 28 and the refrigeration evaporator 32 are connected in parallel, so if the solenoid valves 44 and 49 are both opened by the output signal of the control circuit 15, 0.5kg/cm” (
The low-temperature refrigerant reduced to a pressure of (evaporation temperature -21°C) is transferred to the freezing evaporator 28 and the refrigeration evaporator 32 through the branch pipe 50.
flows in parallel. By evaporating the refrigerant in the reevaporators 28 and 32, the cold storage bodies 29 and 31 for freezing and refrigeration are cooled. Then, as time passes, cooling of the freezing cold storage body 29 progresses, and when the temperature drops to the eutectic point of the cold storage material (for example, −11° C.), freezing of the freezing cold storage body 29 starts. At that time, the refrigeration evaporator 2
A cold storage body 29 located on the refrigerant inlet side of the tube 28a of No. 8
The freezing of the cold storage body 29 on the refrigerant outlet side is completed, and the surface temperature of this cold storage body 29 reaches the set temperature (for example, -1
5°C), the ia circuit 15 activates the temperature sensor 11.
The detection signal of the refrigeration solenoid valve 4 is determined based on the output.
4 is closed to block the refrigerant from flowing into the refrigerating evaporator 28.

At the same time, the indicator light 12 is turned on to indicate completion of cold storage in the freezing cold storage body 29.

Similarly, on the refrigerator side, cooling of the refrigerating cold storage material 31 progresses until the temperature reaches the freezing temperature of the cold storage material (water) (0°C
), freezing of the refrigerating regenerator 31 starts, and freezing of the refrigerant regenerator 31 located on the refrigerant outlet side of the tube 32a of the refrigerating evaporator 32 is completed.
When the surface temperature of the refrigerator 1 drops to the set temperature (for example, -3°C), the control circuit 15 detects the detection signal from the temperature sensor 7, closes the refrigeration solenoid valve 49, and sends the air to the refrigeration evaporator 32. Cut off the refrigerant inflow. At the same time, the indicator light 8 is turned on to indicate completion of cold storage in the cold storage body 31.

Furthermore, the detection signals of temperature sensors 7 and 11
゛When it is determined that both the freezing and refrigerating cold storage bodies 29 and 31 have completed cold storage, the control circuit 15 closes the solenoid valve 48.
The electromagnetic valve 48 is opened. Then, the communication pipe 47 is opened, so that the refrigerant on the cooling side flows through the communication pipe 47 to the refrigerating/freezing inlet 21 of the compressor 21.
It begins to flow into f. As a result, the pressure inside the refrigerating and freezing suction pipe 46 is reduced to the refrigerant pressure on the cooling side (2.0 kg7
cm"), the constant pressure expansion valve 27 remains closed from then on, and all cylinders of the compressor 21 are used for cooling. Note that the refrigerant on the cooling side is transferred to the evaporator 28.32 for freezing and refrigeration. Since the check valve 33 prevents the flow from flowing back into the evaporator 28.32, the inside of the evaporator 28.32 remains at a low temperature for a while.Then, based on the detection signal from the temperature sensor 7.11, the control circuit 15 controls the electromagnetic valve 44, 48, and 49 and the lighting of the cold storage completion indicator lights 8 and 12.

As mentioned above, the freezing cold storage body 29 and the refrigeration cold storage body 31
When the freezing is completed, the vehicle engine stops like when parking, and even if the compressor 21 stops, the inside of the freezer compartment 74 and the refrigerator compartment 75 will be kept for a long time (for example, if the amount of cold storage material for freezing is 700g)
(about 3 hours) can be maintained at a low temperature near the freezing temperature of the cold storage material.

The above explanation is about when the refrigeration switch 4 and the freezing switch 9 are turned on at the same time, that is, when the freezing/refrigerating operation is being performed simultaneously. A similar operation is performed during the independent refrigeration operation.

The operating status of each device controlled by the refrigeration/refrigeration control circuit 15 is summarized in Table 1 below.

In Table 1 above, "during cold storage" shown in the section of the temperature state of the cold storage body 29.31 means a state in which the temperature detected by the temperature sensor 7.11 does not fall to the above-mentioned set temperature, and "cool storage completed" means a state in which the temperature detected by the temperature sensor 7.degree. 11 has decreased to the above-mentioned set temperature.

The present invention is not limited to the illustrated embodiments described above, but
Various modifications are possible, as described below.

(1) When using a swash plate type multi-cylinder compressor 21, the number of refrigerating/freezing compression sections 21b is not limited to one cylinder, but may be increased as appropriate depending on the capacity required for the refrigerator.

(2) As a pressure reducing device on the freezing and refrigeration side, the constant pressure expansion valve 27
In addition, an ordinary temperature-operated expansion valve or a combination of a solenoid valve and a fixed throttle can be used.

(3) In the above embodiment, the refrigeration evaporator 28°32
A bag-shaped frozen/refrigerated cold storage body 2 is placed in the tubes 28a and 32a.
9.31 are placed directly in close contact with each other to cool each of the cold storage bodies 29.31.
A metal cold storage box is provided inside the refrigerator compartment and inside the refrigerator compartment 75, respectively.
The tube of the freezing evaporator 28 is formed into a meandering shape and stored in the cold storage box of the freezer compartment 74, and the freezing cold storage body 29 is also stored.
By forming the tube into a serpentine shape and storing it therein and storing the refrigerating cold storage body 31, each cold storage body 29.31
It is also possible to have a structure for cooling.

(4) In the above embodiment, the solenoid valves 44 and 49 were used as the valve means for controlling the flow of refrigerant to the evaporator 28 and 32, but instead of the solenoid valves 44 and 49, a motor, a piezoelectric element, etc. Of course, the electrically operated valves used can also be used. Moreover, the same function can be obtained by simply using one rotary valve whose rotary type valve body is controlled to rotate to a predetermined position by a pulse motor in place of the two electromagnetic valves 44 and 49, and the valve means of the present invention can be implemented in various ways.

(Effects of the Invention) As described above, according to the present invention, two types of cold storage bodies each having a freezing temperature corresponding to the freezing function and the refrigeration function are used, and the cold storage body with the lower freezing temperature is provided in the freezing room, and By installing the cold storage body with a higher freezing temperature in the refrigerator compartment, and cooling and freezing both of the cold storage bodies in their respective evaporators, cold storage will continue to occur in the freezer compartment and in the refrigerator compartment for a long time even after the compressor is stopped. Can maintain body temperature at near freezing temperature.

Moreover, in the present invention, by controlling the opening and closing of the i-stage valve by the control circuit, the flow of refrigerant to the evaporator for refrigeration and the evaporator for refrigeration can be arbitrarily controlled. Simultaneous operation can be freely selected.

[Brief explanation of the drawing]

The drawings all show embodiments of the present invention, and FIG. 1 is a diagram of a refrigeration cycle of the present invention, including an electric circuit. Fig. 2 is a longitudinal sectional view of the compressor 21 in Fig. 1, Fig. 3 is a partial sectional side view of Fig. 2, Fig. 4 is a longitudinal sectional view of the refrigerator-freezer with the door open, and Fig. 5 is FIG. 4 is a partially cutaway perspective view with the door removed, and FIG. 6 is a Mollier diagram of the refrigeration cycle. 21... Compressor, 28... Refrigeration evaporator, 29...
- Refrigerating cold storage body, 31... Refrigeration cold storage body, 32...
Refrigeration evaporator, 44.49... Solenoid valve forming valve means,
68°69...door, 74...freezer, 75...
Refrigerator room.

Claims (1)

[Scope of Claims] (a) A freezing compartment having a door that can be opened and closed; (b) A refrigerator compartment having a door that can be opened and closed; (c) A cold storage body for freezing installed in the freezing compartment; (d)
) a refrigeration evaporator installed in the freezer compartment to cool the refrigeration regenerator; (e) a refrigeration regenerator installed in the refrigeration compartment and having a higher freezing temperature than the refrigeration regenerator; (f) a refrigeration evaporator provided to cool the refrigeration regenerator in the refrigeration chamber and provided in parallel with the refrigeration evaporator in the refrigeration cycle; (g) the refrigeration evaporator; A regenerator refrigerator-freezer, comprising: a valve means for controlling the flow of refrigerant to the refrigerating evaporator; and (h) a control circuit for electrically controlling opening and closing of the valve means.