JPS6217578A - Refrigerator for car - 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 the Invention The present invention relates to a refrigerator-freezer for a vehicle, and more particularly to a refrigerator-freezer for a vehicle of a regenerator type.

Conventional cold storage refrigerators for vehicles are disclosed in Japanese Patent Application Laid-Open No. 59-50828, for example.
This is described in the M bulletin, and 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 WA. This allows it to be kept cold at a low temperature for a long period of time. However, since this refrigerator uses only a single regenerator, it is not possible to obtain the functions of freezing and refrigeration, which have two different cooling temperatures (for example, -10°C and O''C).

Problems to be Solved by the Invention An object of the present invention is to provide a refrigerator-freezer for a vehicle with a simple structure that can always fully perform both freezing and refrigeration functions.

Means for Solving the Problems A freezing room and a refrigerating room each having a regenerator and an evaporator are provided, and a valve device for controlling the flow of refrigerant passing through the freezing evaporator and the refrigeration evaporator in series is opened and closed. A t, 1lt11 circuit is provided which controls the temperatures of the freezer compartment and the refrigerator compartment based on signals from respective temperature sensors.

The action control circuit determines the degree of freezing of the cold storage bodies in the respective compartments based on signals from the temperature sensors in the freezing compartment and the refrigerating compartment, and controls opening and closing of the valve device.

After the cold storage bodies in the freezer and refrigerator compartments are completely frozen, even if the compressor stops, the freezer compartment and refrigerator compartment will remain at a low temperature near their respective freezing temperatures for a long time! be done.

EXAMPLES The present invention will be explained below based on examples shown in the drawings. FIG. 1 shows an automobile refrigeration cycle for cooling a single room and refrigerating articles, and a compressor 21 is connected to an automobile engine drive shaft (not shown) via an electromagnetic clutch 20. In this example, the compressor 21 is a swash plate compressor with 10 cylinders, of which 9 cylinders are configured as a compression section 21a for cooling, and the remaining 1 cylinder is for refrigerating.

It is configured as a compression section 21b. In this case, each of the compressor sections 21a and 21b of the compressor 21 is provided with an air-conditioning suction port 21e and a refrigerating/freezing suction port 21f independently, so that each compressor section can handle different suction pressures independently. It can now be set to . In addition, the cooling compression section 21a
The refrigerating and freezing compression section 21b are communicated with each other by a communication path 21d, and the refrigerant (R12) having different pressures sucked from each suction port 21e and 21f is transferred to each compression section 21.
Before being compressed in the refrigerant sections 21a and 21b, the communication passage 21d communicates with the refrigerant, and the pressure is increased to the pressure of the cooling refrigerant.
It is designed to be discharged from 1c to the outside of the compressor.

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 the rotational force of a shaft 210 driven by an automobile engine via an i-clutch 2° to be applied to a piston 2 by a swash plate 211.
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 shoes 213 and balls 214. There are five pistons 212, and their surfaces are coated with a resin material such as Teflon.

These pistons 212 are disposed in five cylinder bores (one bore 216 is shown in FIG. 1) formed in the cylinder block 215 so as to be able to reciprocate in the axial direction. Both end surfaces of the piston 212 cooperate with the cylinder bore 216 to form ten cylinders (cylinder bore 21
Of these 10 cylinders, 111 cylinders 217a constitute the compression section 21b for freezing and refrigerating in FIG. 1, and the remaining cylinders 217 constitute the compression section 21a for cooling. .

An axial 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, and the swash plate chamber 218 communicates with the cylinder bore 216. On the other hand, in the lower part of the cylinder block 215, there is an oil chamber 219 that is normally filled with lubricating oil.
is also formed.

On both end faces of the cylinder block 215, an annular valve plate 220 and a suction valve 22 formed from 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 valve plates 220 and 220, and these suction boats 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 circular shape, and each has a substantially circular partition wall 227 on its inner surface.
A partition wall 227°228 is provided protruding 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 separates the sub-suction chamber 234 from the suction chamber 231.
Also at the point where the end plate 22 is separated from the
Different from 3. The refrigeration/freezing suction port 21f is opened in the sub suction chamber 234. The auxiliary suction chamber 234 communicates with the cylinder 217a via a suction boat 225 corresponding to the cylinder 217a, while the suction 'g231 communicates with all remaining cylinders 217. Left and right valve plates 22
0.220 is provided with five discharge boats 235 corresponding to five cylinders, and these discharge boats 235 are opened and closed by discharge valves (not shown), and communicate with the discharge chamber 229 when opened. This discharge chamber 2
29 is connected to the discharge port 2I in FIG. 1 via the passage 236 in FIG. 3.
communicates with C.

As is clear from the above description, one cylinder 217a that can communicate with the sub-suction chamber 234 constitutes the sub-compression section 21b for freezing and refrigeration, and the other nine cylinders 217 constitute the main compression section 21a for cooling. It consists of The cooling inlet 21e, which is the main inlet, is connected to the cylinder block 2 as shown in FIG.
15, 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 via a passage formed by a gap between the through bolt 224 and the bolt hole 224a.

Therefore, the refrigerant flowing into the suction chamber 231 from the swash plate chamber 218 passes through the suction boat 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 flows into the cylinder 2.
17a, and is sucked into this 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 bore 216 and extends circumferentially over a portion around the piston 212 within the cylinder bore 216 . This communication groove 237 directly opens into the swash plate chamber 218, and the cooling inlet 21e1 through a communication hole (not shown). : Communicating.

Furthermore, compression! The discharge port 21C (Fig. 1) of 1121 is connected to the cylinder block 215 in line with the cooling inlet 21 (3)
2, but is not shown in FIG. This discharge port 21G is a passage 23 shown in FIG.
6, the discharge chamber 22 in the left and right end plates 222, 223
It is connected to 9.229.

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 the swash plate chamber 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 the circumferential annular groove 238 is opened in the cylinder 217a, the low-pressure refrigerant for cooling is filled 237 and the swash plate chamber 218 flows through the communication hole 239 forming the communication path 21d and the annular groove 238. The refrigerant flows through the cylinder 217a and mixes with the low-pressure refrigerant for refrigeration and freezing in this cylinder.

Here, the pressure of the low-pressure refrigerant for refrigeration is 0.51 (9/,
2. If the pressure of the low-pressure refrigerant for cooling is set to 2.0 and 97α2, when the low-pressure refrigerant for cooling flows into the cylinder 217a through the communication passage 21d and mixes with the low-pressure refrigerant for refrigeration, this cylinder The pressure of the refrigerant in the refrigerant 217a becomes approximately equal to the pressure at the start of the compression amount of the other cylinder 217 constituting the main compression section 21a, that is, 2.0 #/cm2. Therefore, the compression stroke in the cylinder 217a starts from approximately the same pressure as the compression start pressure of the other cylinders 217,
The compressed refrigerant is discharged into the common discharge chamber 229 and joins with the refrigerant discharged from the other cylinders 217, and then flows into the passage 23.
6 and is discharged from the discharge port 21c in FIG. 1 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.

Further, the compression 121 can be applied to a vane type compressor in addition to the swash plate type multi-cylinder compressor as described above. In that case, if the refrigerating/freezing suction port 21f and the cooling suction port 21e are opened in descending order of 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 Ky/cR2. It is possible to start compression in this state. As described above, each compression part 21a, 21b of the compressor 21 of this embodiment has an independent suction port 21e.
, 21f are provided, making it possible to independently set the suction pressure of each compression section.

The above compression I! The discharge port 21C of the condenser 121 is connected to the condenser 22 as shown in FIG. 1, and the discharge side of the condenser 22 is connected to the receiver 23. On the discharge side of the receiver 23, a cooling pressure reducing device, in this example a temperature-operated expansion valve 24, and a cooling evaporator 25 connected thereto are provided.
A cooling air blowing fan 50 is disposed on the air upstream side of the evaporator 25. The refrigerant outlet side of the evaporator 25 is connected to the cooling suction port 21e of the compressor 21 via a cooling suction pipe 45.

On the other hand, a constant pressure expansion valve 2 which is a specific example of a pressure reducing device for refrigeration and freezing
7, and a refrigeration evaporator 2 connected to this constant pressure expansion valve 27.
8 and the refrigeration evaporator 32 are provided in parallel with the cooling expansion valve '24 and the evaporator 25. The refrigeration evaporator 28 and the refrigeration regenerator 29 cooled by the refrigeration regenerator 29 are installed in the freezing chamber 74, which will be described later. It is installed inside the refrigerator compartment 75. A check valve 33 that allows refrigerant gas to pass only in one direction toward the compressor suction side is connected to the outlet side of the evaporator 32 for refrigeration. The compression l1 is carried out by the pipe 46.
It is connected to the refrigerating/freezing inlet 21f of 121. The constant pressure expansion valve 27 opens when the downstream pressure thereof, that is, the pressure of the refrigeration evaporator 28, decreases to a set pressure, for example, 0.5 kg/α2 or less.

A communication pipe 47 is provided that communicates between the cooling suction pipe 45 and the refrigerating and freezing suction pipe 46.
is provided with a solenoid valve 48, and when the solenoid valve 48 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 this battery 1 is connected to cooling f, 1Ii1 via a cooling switch 2.
1 circuit 3 is connected. Reference numeral 4 denotes a refrigerator switch, which is connected to the battery 11 via the cooling switch 2. The refrigerator switch 4 is connected to a refrigerator control circuit 5. 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. When the blowout temperature becomes lower than the set temperature, the resistance value increases and the cooling 11111t11 outlet 3
detects this change in resistance value, turns off the power to the electromagnetic clutch 2o, and stops the compressor 21.

A temperature sensor 7 is provided to sense the surface temperature of the cool storage body 31 cooled by the refrigerating evaporator 32, and is composed of a thermistor. This temperature sensor 7 is connected to a refrigerator control circuit 5, and this refrigerator control circuit 5 is connected to the temperature sensor 7.
When the sensed temperature of the solenoid valve 4 becomes lower than the second set temperature, the solenoid valve 4
The electromagnetic valve 48 is opened by cutting off power to the solenoid valve 8. The control circuit 5 is configured to turn on a display device 8 such as a lamp or LED when the temperature detected by the temperature sensor 7 falls to a first setting of 4 degrees, which is slightly higher than the second setting temperature.

This display device 8 is designed 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 #I? It has a case 62 of i. Furthermore, a heat insulating material 63 such as hard polyurethane is injected between the double wall structures to improve heat insulation properties. The freezer/refrigerator [60] has a freezer door 68 and a refrigerator door 69, which are made of a double-walled resin member 64, 65 and a heat insulating material 66, 67 such as hard polyurethane, similar to the case 61, and are hinged. 70 and 71 are connected to the center cover 72 of the refrigeration unit 60 so as to be openable and closable, and a rubber member (not shown) with a built-in magnet is fixed to the periphery of the upper end surface of the case 62. The members are securely attracted and fixed by magnetic force to iron plates (not shown) fixed to the periphery of the door 68, 89.

The inside 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 θ2. The lower end of this partition member 74 is fitted into the groove 76 of the case 62, while the upper end is held under pressure 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.

As shown in FIG. 5, the constant pressure expansion valve 27 and the check valve 33 are both disposed within the case 62, and the refrigeration evaporator 28 connected to the downstream side of the constant pressure expansion valve 27 is As shown in the figure, it is composed of a meandering piping 28a having a round cross section, and this piping 28a is arranged along the inner surface of the case 62 so as to surround the refrigeration v74. The refrigerating evaporator 32 is also composed of a similar pipe 32a, and this pipe 32a is also arranged along the inner surface of the case 62 so as to surround the refrigerating compartment 75. Therefore, case 6
As schematically shown in FIG. 6, piping 28a or 32a is disposed on all four inner surfaces of 2. Piping 28
a and 32a are made of a material such as copper or aluminum.

A refrigeration regenerator 29 is disposed inside the meandering pipe 28a of the refrigerating evaporator 28 so as to be in close contact with the meandering pipe 28a. A large number (for example, five) of cold storage bags each containing a sealed cold storage material are arranged side by side inside the bag. As the cold storage material of the freezing cold storage body 29, for example, a 19.7% potassium chloride eutectic solution having a eutectic point (freezing temperature) of -11° C. is used.

Furthermore, a refrigerating regenerator 31 is disposed in close contact with the inside of the pipe 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 cold 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. is arranged in close contact with the cool storage body 29°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 8o.
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 9 that detects the temperature of the freezing cold storage body 29 described above is connected to the cold storage body 29 and the cooling plate 78 located at the most downstream side of the pipe 28a of the freezing evaporator 28, as shown in FIG. It is tightly fixed between.

Similarly, as shown in FIG.
Cool storage body 31 and cooling plate 7 located at the most downstream part of 2a
It is closely fixed between 9 and 9.

Next, the operation of this embodiment will be explained. FIG. 7 is a Moller diagram of the refrigeration cycle, and the cycle 1190 in the figure shows the operating characteristics of the refrigeration cycle for cooling, and the chain line 9
1 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 υItX1 circuit 3, but when the cooling starts, the refrigeration evaporator 25
Since the temperature of the blown air is higher than the set temperature (for example, 3 degrees Celsius), the control circuit 3 compares the detection signal of the temperature sensor 6 with the reference signal and outputs an output at the level 11". Then, the electromagnetic clutch 20 becomes connected and the driving force of the automobile engine is transmitted to the compression chamber 21, so that the compression chamber 21 rotates and compresses the refrigerant gas.

In the above state, when the operating switch 4 of the freezer/refrigerator #60 is further turned on, power is supplied to the control circuit 5, but at the time of startup, the surface temperature of the cold storage body 31 is higher than the first set temperature (for example, -3°C). Therefore, the control circuit 5 compares the detection signal of the temperature sensor 7 with the reference signal, outputs an "Hl" level output, and energizes the solenoid valve 48, so the solenoid valve 48 remains closed and the display device Since the display device 8 is given an output at the "o" level, the display device 8 remains off.

Since the Ti solenoid valve 8 is closed, the cooling suction pipe 4
The cooling refrigerant from 5 is sent to the main suction port 21e of the compressor 21,
Further, the refrigerant for refrigerating and freezing from the suction piping 46 for refrigerating and freezing is independently sucked into the sub suction port 21f of the compressor 1121.

Here, the refrigerating/freezing compression section 21b in the compression 1121
As described above, at the end of the suction stroke (near the bottom dead center r94), it communicates with the cooling compression section 21a via the communication passage 21d, so the pressure inside the refrigerating/freezing compression section 2ib is lower than the cooling compression section 21.
Due to the inflow of refrigerant from a, the pressure is the same as that on the cooling side, that is, 2. It increases to OK'J/α2 (P6→P3 in FIG. 7). Therefore, both compression parts 21a and 21b are 2,
Compress the refrigerant at a pressure of 9/ctn2 (7) to 0 (P in Figure 7).
3→P4).

This compressed refrigerant gas is mixed with the discharge port 2I.
C and is cooled by the condenser 22 (P in Figure 7).
−+P1).

This liquefied refrigerant is stored in the receiver 23, and the constant pressure expansion valve 2
7 and temperature-operated tension valve 24 to reduce the pressure (P
-+P5 and P1→P2), then the evaporator 28.
32 and 25, respectively (P→P6 and P2→P3). Here, 11 points represent the state of the high-pressure refrigerant on the inlet side of the 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. represents the state of the refrigerant at the suction port 21e,
P4 represents the state of the refrigerant at the discharge port 21c. In the refrigerating/freezing cycle, the state of the refrigerant downstream of the constant pressure expansion valve 27 is set to P5 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 0.589/J by the action of the constant pressure expansion valve 27.
It is possible to maintain As described above, by maintaining the evaporation pressure in the evaporator 28.32 for freezing and refrigeration at 0.5 and 9/α2, it is possible to maintain the refrigerant temperature at -21°C and perform refrigeration and freezing operations. It is.

Here, to explain the refrigeration and freezing effects in detail,
In the refrigeration cycle shown in FIG. 1, the refrigeration evaporator 32 is connected in series downstream of the refrigeration evaporator 28, so the constant pressure expansion valve 27 adjusts the temperature to 0.5 by 9/cttr2 (evaporation temperature - 21
The low-temperature refrigerant, which has been reduced in pressure to a pressure of 0.degree. Therefore, at first, the gas refrigerant that has finished evaporating flows into the refrigerating evaporator 21i32, so that the refrigerating cold storage body 31 gets colder!
The case of Ia is slight.

When cooling of the freezing cold storage body 29 progresses with the passage of time and 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 this time, the cold storage bodies 29 located on the refrigerant inlet side of the pipe 28a of the freezing evaporator 28 are frozen in order, and when the freezing of the cold storage bodies 29 on the refrigerant outlet side is completed, the refrigerant evaporation temperature and the temperature of the cold storage body 29 are Since the difference between the refrigerant and the The cold storage body 31 is cooled.

As a result, the temperature of the cold storage body 31 for refrigeration decreases to 0° C. or lower, and freezing of the cold storage material (water) in the cold storage body 31 is started. Also in this case, the cold storage bodies 31 located on the refrigerant inlet side of the piping 32a of the refrigerating evaporator 32 are frozen in order, and the cold storage bodies 31 on the refrigerant outlet side are frozen last.

In the above manner, cold storage for freezing and refrigeration is completed.

The main contents of the present invention are prevention of freezing of the cold afllll when the temperature is 11 L, and control of the degree of cold storage during heat load change and cold storage, and will be described in detail below.

The control circuit 5 discriminates the signal from the temperature sensor 9 that detects the temperature of the refrigerating regenerator 29, and as shown in FIG. It outputs a signal at the "lo" level below -12°C, and on the other hand, increases from the low temperature side until, for example, -8°C, it outputs a signal at the "alpha level", and - A "1-1i" level signal is output when the temperature is 8°C or higher.

On the other hand, a temperature sensor 7 that detects the temperature of the cold storage body 31 for refrigeration
The signal t, II m is also determined by the circuit 5, and as shown in FIG.
"Outputs a level signal and outputs 'lo' at -2℃ or below."
Output a level signal, and conversely increase from the low temperature side, for example, output a '1o' level signal up to 2°C, and output a 'H1° level signal at 2°C or higher. .

Note that the median value of the freezing side hysteresis, for example -10°C, is
This corresponds to the temperature detected by the temperature sensor 9 while the refrigeration cold storage body 29 is frozen, and the median value of the refrigeration side hysteresis, for example, 0°C, corresponds to the temperature detected by the temperature sensor 7 while the refrigeration side cold storage body 31 is frozen. be. Moreover, 4° C. seems to be appropriate for the hysteresis based on experience.

The above two output signals for freezing and refrigeration are further compared and judged in the control circuit 5 as shown in FIG. 9, and the electromagnetic t?
48 (7) Iglrfl, display device 218 (7) O
Performs N-OFF electrical output.

FIG. 11 shows a concrete electric control circuit 5. As shown in FIG.

A is a sensor and a power supply section, and the respective components are shown in FIG. Reference numeral 51 includes a power transistor and is a voltage adjustment section. Reference numeral 52 denotes an l-1i-10 determination section which includes a comparator, inputs the signal from the freezing room temperature sensor 9, and performs Hi and LO determination. 53 is also similar Hi-Lo
The determination section determines Hl and O of the signal from the temperature sensor 7 for the refrigerator compartment. 54 is mode determination and υItXl
The output section includes a flip-flop, and both determination sections 52 and 5
Based on the combination of H1 and LO of the signals from temperature sensors 9 and 7 from 3, the mode shown in FIG. 9 is determined from the combination of 1-1i and LO. Based on this mode determination, a signal for controlling the solenoid valve 48 is output, and at the same time, the display device 8 is turned on or off. B is a switch and a display section, each component of which is shown in FIG. 8B is a light emitting diode that turns on or off in conjunction with the operation of the switch 4.

How the above functions operate in accordance with temporal temperature changes will be explained based on FIG. 10.

For example, when the operation is started from a condition of 30°C both inside and outside the refrigerator, freezing, followed by refrigeration and cooling proceed, but initially both temperature sensors 9 and 7 are at Hi level, so as shown in Fig. 9. , mode 1 is in effect, the solenoid valve 48 is open, refrigerant is allowed to flow into the evaporator for freezing and refrigeration, and the cold storage completion display VtI! i remains OFF. Next, when the refrigeration side completes cold storage and the temperature drops rapidly, for example, below -12°C, the mode becomes 2, but operation continues, and the refrigeration side also completes cold storage, and the temperature suddenly drops, for example - When the temperature drops below 2°C, both sensors 9.7 reach the LO level, and in order to prevent freezing on the refrigerator side, the solenoid valve opens and the A
The A/C refrigerant also flows through the bypass pipe 47, and all cylinders of the compressor 21 allow the A/C refrigerant to flow into the compressor 21, and no refrigerant flows into the freezing and refrigeration evaporators. This is mode 3, and the display device indicates that the cold storage is complete! 8 turns on. During this time, it has the effect of helping the cooling capacity of the A/C side.

For example, during mode 3 in the cold storage state, if the heat load on the freezing side becomes large and the temperature on the freezing side drops to the 1-1i level, mode 4 is entered and the solenoid valve closes again as shown in Fig. 9. Refrigerant flows into the cooling section to bring the freezing side to the LO level. Even when the heat load on the refrigeration side becomes large, mode 2 is set as described above, and cooling is restarted.

Furthermore, even if the heat load is unbalanced between freezing and refrigeration during cold storage or cold storage, the refrigerant will flow from the freezing side to the refrigeration side, so there will be a situation where the refrigeration side does not have enough cold storage and the refrigeration side becomes frozen. can't happen. In other words, when only the refrigeration side is at high temperature, the refrigerant evaporates extremely actively mainly on the upstream refrigeration side, and it is impossible for the refrigerant temperature to rise and freeze the downstream refrigeration side.

The present invention is not limited to the embodiments described above, and various modifications described below are possible.

(1) As a temperature sensor for detecting the degree of cold storage, a temperature switch using a reed switch or the like may be used instead of a thermistor.

(2) Although the detection position by the temperature sensor is between the cold storage material and the cooling plate, it may be substituted by the temperature inside each refrigerator or refrigerator.

(3) One display device (lamp) is set to indicate the completion of cold storage, but if it is to indicate the completion of cold storage for freezing and refrigeration,
You may set two.

Effects of the Invention In the present invention, the structure is simple because the flow of refrigerant passing through the freezing evaporator and the refrigeration evaporator in series is controlled by one valve device.

The control circuit also determines the degree of freezing of the freezing cold storage body and the refrigeration cold storage body based on signals from both temperature sensors that detect the respective temperatures of the freezer compartment and the refrigerator compartment, and opens and closes the valve device. 11w, it is possible to prevent the occurrence of a situation where one of the freezer compartment and the refrigerator compartment is functioning but the other is not fully functioning, and both the freezer compartment and the refrigerator compartment can always exhibit their full functionality.

[Brief explanation of the drawing]

FIG. 1 is a diagram of the refrigeration cycle of the present invention, including an electrical 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 section removed; Fig. 6 is a schematic perspective view showing the form of the evaporator piping in the refrigerator/cold storage; Fig. 7 is a Mollier diagram of the refrigeration cycle; Figure 8 is a diagram showing the Hl and LO output characteristics with respect to the detected temperature of the temperature sensors on the freezing and refrigeration sides, and Figure 9 shows the relationship between the Hi and 0 outputs and modes of the temperature sensors on the freezing and refrigeration sides, and the electromagnetic Diagrams showing the operating status of valves and display devices,
FIG. 10 is a graph showing the correspondence between the mode and the temporal change in temperature detected by temperature sensors on the freezing and refrigeration sides, and FIG. 11 is a circuit showing a specific example of the control circuit in FIG. 1. It is a diagram. In the figure, 5...control circuit, 7...refrigeration side temperature sensor, 9...
- Refrigeration side temperature sensor, 21... Compressor, 28... Refrigeration evaporator, 29...
- Refrigerating cold storage body, 31... Refrigeration cold storage body, 32...
Refrigeration evaporator, 74...Freezing room, 75...Refrigerating room.

Claims (2)

[Claims] (1) A freezing room having a freezing cold storage body and a freezing evaporator disposed in close contact with the freezing cold storage body; a refrigerating room having a refrigerating evaporator; a valve device for controlling the flow of refrigerant from the compressor to the refrigerating evaporator and the refrigerating evaporator in series; and detecting humidity in the freezing compartment and the refrigerating room. and a control circuit that electrically controls opening and closing of the valve device based on signals from respective temperature sensors. (2) In the vehicle refrigerator-freezer according to claim 1, the control circuit operates the valve device when a signal from at least one of the temperature sensors indicates that the temperature is higher than a predetermined temperature. A refrigerator-freezer for a vehicle in which the refrigerant flows through both the evaporators.