JPS6191465A - Refrigeration cycle device - 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 refrigeration cycle device that can provide three different functions of cooling, refrigeration, and freezing with one compressor, and is suitable for use in vehicles. It is something.

[Conventional technology]

The present applicant has developed a refrigerator that achieves both cooling and refrigeration effects by differentiating the evaporation pressures of the evaporator for cooling the passenger compartment and the evaporator for refrigeration, as disclosed in Japanese Unexamined Patent Publication No. 11370/1983. We are proposing a cycle device first.

[Problem that the invention seeks to solve]

The above conventional devices all obtain two temperatures by changing the evaporation pressure in the two evaporators, but in recent years,
Vehicles are also being used for leisure purposes such as camping, and as a result, there is a demand for refrigerators to be equipped with two evaporators, one for refrigeration and one for freezing, to obtain two different cooling temperatures within the refrigerator. It has become.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a refrigeration cycle device that can independently set three temperatures for cooling, refrigeration, and freezing.

[Means for solving problems]

In order to achieve the above object, the present invention provides a compressor that compresses and discharges a gas refrigerant, a condenser connected to a refrigerant discharge side of this compressor, a refrigerant outlet side of this condenser, and a compressor that compresses and discharges a gas refrigerant. a cooling pressure reducing device and a cooling evaporator provided between the refrigerant suction side of the cooling device and a cooling evaporator provided between the refrigerant outlet side of the condenser and the refrigerant suction side of the compressor; A refrigeration pressure reducing device and a refrigeration evaporator are provided in parallel with the evaporator, and the refrigeration pressure reducing device and the refrigeration evaporator are provided between the refrigerant outlet side of the condenser and the refrigerant suction side of the compressor. a cooling refrigerant circuit including the cooling pressure reducing device and the cooling evaporator, and a refrigeration device including the refrigeration pressure reducing device and the refrigeration evaporator. a control valve that controls the flow of refrigerant to a refrigerant circuit for cooling, and a control circuit that repeatedly opens and closes this control valve at predetermined intervals; A technical measure is adopted in which the evaporation pressure is lowered in the order of refrigeration and freezing.

[Effect]

According to the above technical means, the liquid refrigerant condensed in the condenser is transferred to the cooling refrigerant circuit, the refrigeration refrigerant circuit, and the refrigeration refrigerant by repeatedly opening and closing the control valve at predetermined intervals based on the electrical output signal of the control circuit. The evaporation pressure in each circuit can be set independently by each pressure reducing device, and an evaporation temperature suitable for each of the cooling, refrigeration, and freezing functions can be obtained.

〔Effect of the invention〕

Therefore, according to the present invention, there is an excellent effect that three different functions of cooling, refrigeration, and freezing can be realized with a simple refrigeration cycle that commonly uses one compressor and one condenser.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings.

Figure 1 shows a refrigeration cycle commonly used in vehicles.
A compressor 20 compresses and discharges refrigerant, and is operated by receiving the driving force of a vehicle running engine (not shown) via an electromagnetic clutch 21. 22 is this compressor 2
a condenser that condenses high-temperature, high-pressure refrigerant discharged from zero;
23 is a liquid receiver that receives the refrigerant condensed in the condenser 22 and discharges only liquid refrigerant. 24 is a pressure reducing device that depressurizes and expands the liquid refrigerant into a low-temperature, low-pressure mist, and 25 is an evaporator for cooling the vehicle. Here, the pressure reducing device 24 is composed of a temperature-operated automatic expansion valve that varies the amount of throttling according to a pressure signal from a temperature-sensitive tube 24a disposed on the outlet side piping of the cooling evaporator 25. The degree of superheating of the refrigerant in the outlet pipe of the container 25 is kept constant. The cooling evaporator 25 is integrated with a heating heater unit (not shown) disposed in the vehicle interior, for example, at the lower center of the vehicle instrument panel.

Then, air from inside or outside the vehicle is sucked in by a fan 26, and after being cooled by an evaporator 25, the air is passed through the heater unit to the air blowers provided at the center and left and right sides of the front of the instrument panel inside the vehicle. The air is blown out toward the occupants from an outlet (not shown).

These compressor 20, condenser 22, liquid receiver 23, pressure reducing device 24, and evaporator 25 are connected in order to form a closed circuit through refrigerant piping to form a refrigeration cycle.
A control valve 29 is installed at the inlet portion of 4. 27 is a cooling refrigerant circuit including the cooling pressure reducing device 24, cooling evaporator 25, and control valve 29; 28 is a refrigeration refrigerant circuit provided in parallel with the cooling refrigerant circuit 27;
In the middle of this circuit 28, in the direction in which the refrigerant flows, an electromagnetic control valve 52, a constant pressure expansion valve 6, a refrigeration evaporator 43, and a check valve 7 are provided.
are arranged in sequence.

The constant-pressure expansion valve 6 is a type of expansion valve that opens when the pressure on the low-pressure side (in other words, the evaporation pressure of the evaporator 43) falls below a set value, and can control the low-pressure side to a constant pressure. R-12 is used, and the set pressure of the constant pressure expansion valve 6 is selected to be, for example, 0.8 kg/cJG (M total temperature -16°C).

The control valve 29 is for blocking the flow of refrigerant to the cooling pressure reducing device 24 and the cooling evaporator 25, and by blocking the flow of refrigerant to the pressure reducing device 24, the refrigerant flows into the refrigeration refrigerant circuit 28. It is provided to allow the flow of water. Although any suitable control valve 29 can be used, in this embodiment, an electromagnetic on-off valve that moves between two positions, an open position and a closed position, is used.

50 is a refrigeration refrigerant circuit provided in parallel with the refrigeration refrigerant circuit 28, and in the middle of this circuit 50, a constant pressure expansion valve 16, a refrigeration evaporator 53, and a check valve 17 are installed in the direction in which the refrigerant flows. are arranged in sequence.

The constant pressure expansion valve 16 is connected to the pressure on the low pressure side (in other words, the evaporator 53
This is a type of expansion valve that opens when the evaporation pressure (evaporation pressure of For example, 0.4kg/cn! G (evaporation temperature -24°C) is selected and L. The control valve 52 described above is for blocking the flow of refrigerant to the constant pressure expansion valve 6 for refrigeration and the evaporator 43 for refrigeration, and a valve similar to the control valve 29 may be used as this control valve 52. .

The refrigerating evaporator 43 and the freezing evaporator 53 described above are installed in the refrigerating regenerator 4 and the refrigerating regenerator 14, respectively, to cool the regenerator material.

Both regenerators 4 and 14 are housed in one refrigerator-freezer, and the structure of this refrigerator-freezer will be explained with reference to FIGS. 2 and 3. It is attached by a bracket (not shown) to the upper wall surface of a rear nap seat 72 located behind the driver's seat 71 in the vehicle interior. A door 62 is provided at the front of a case 61 of the refrigerator-freezer 60 so as to be openable and closable.

The case 61 of the refrigerator-freezer 60 is a box with a so-called double-wall structure using double-walled resin members made of polyethylene or polypropylene.
Insulating material such as rigid polyurethane is injected between the heavy walls. The door 62 similarly has a structure combining a double wall structure and a heat insulating material such as hard polyurethane, and is connected to the case 61 by a hinge (not shown) so as to be openable and closable. The inside of the case of the refrigerator 60 is vertically partitioned by a partition plate 63 made of a hard material with excellent thermal conductivity. A freezer 64 is installed in the upper left side of the interior of the refrigerator, which is above the partition plate 63, and is made of a double resin member similar to that of the refrigerator 60, with a resin insulating material injected inside. A door 65 having a similar double wall structure and a heat insulating material such as hard polyurethane is connected to the door 64 by a hinge so as to be openable and closable. A refrigerating regenerator 14, which is made of a material with excellent thermal conductivity and corrosion resistance, such as stainless steel or aluminum, and has an appropriate internal capacity is disposed at the back of the freezer 64. Inside the refrigerating regenerator 14, 400 g of a 19.7% eutectic solution of potassium chloride with a melting point of -11°C is sealed as a refrigerating material to maintain the refrigerating temperature for a long time, and copper A refrigerant evaporator 53 for freezing, which is a pipe or the like bent in a meandering manner, is arranged. A constant pressure expansion valve 16 is installed on the refrigerant inlet side of the freezing refrigerant evaporator 53, and a check valve 17 is installed on the refrigerant outlet side. The interior of the freezer 64, except for the refrigerating regenerator ■4, is partitioned into upper and lower parts by a partition plate 66, and the space divided into the upper and lower parts is used as a space for storing the object A to be frozen. On the other hand, on the far right side of the upper chamber of the partition plate 63 mentioned above, a refrigerating regenerator 4 is formed of a material having excellent thermal conductivity and corrosion resistance and has an appropriate internal capacity, similar to the refrigerating regenerator 65. is installed, and 1000 g of water is sealed inside this refrigerating regenerator 4 as a refrigerating regenerator material, and a refrigerant evaporator 43 for refrigerating, which is bent by a pipe or the like and formed in a meandering shape, is installed. has been done. A constant pressure expansion valve 6 is provided on the refrigerant inlet side of the refrigerant evaporator 43 for refrigeration, and a check valve 7 is provided on the refrigerant outlet side. The interior of the case 61 except for the freezer 64 and the refrigerating regenerator 4 is used as a space for storing objects B to be refrigerated. Four refrigerant pipes are led out from the inside of the case 61 to the outside, and the control valve 52 (shown in FIG. 1) is connected to the case 61.
It is installed at an appropriate location outside the building.

Next, the configuration of the electric control section will be explained with reference to FIGS. 1 and 4.

Reference numeral 30 denotes a temperature sensor made of a thermistor, which detects a temperature related to the degree of cooling of the evaporator, such as the temperature of the air (cold air) blown from the cooling evaporator 25 or the fin surface temperature of the evaporator 25, and outputs a detection signal thereof. is input to the first control circuit 31, and the electromagnetic clutch notch 21 is energized on and off. The first control circuit 31 includes the temperature sensor 30
In addition to the detection signal of
a is input, and the energization of the electromagnetic clutch 21 and the idle speed increase device 33 of the automobile engine is controlled in accordance with these two human power signals. Latter device 3
3 is a well-known device that increases the opening degree of a throttle valve of a carburetor of an automobile engine, for example.

The first control circuit 31 is connected to a vehicle-mounted power source battery 36 via a cooling switch 34 and an ignition switch 35 of the vehicle engine.

Reference numeral 37 denotes a second control circuit, which receives a detection signal from the temperature sensor 5 closely fixed to one outer surface of the aforementioned refrigerating regenerator 4 and a detection signal from the temperature sensor 15 closely fixed to the outer surface of the refrigerating regenerator 14. is input, and the indicator light 9. is activated in response to this input signal.
19 and the opening and closing of control valves 29 and 52, and also inputs a signal to the first control circuit 31 to forcibly connect the electromagnetic clutch 21. 8 is a refrigerator switch.

FIG. 4 illustrates a specific configuration of the first and second control circuits 31 and 37, in which the first control circuit 31 is connected to the temperature sensor 3.
A comparator 310 that compares the detection signal of 0 and a setting signal, a frequency-voltage conversion circuit 311 that converts the pulse signal 32a from the ignition device 32 into a DC voltage, comparators 312 and 323,
AND circuit 314.315, transistor 316.31
7, a relay 318, an inverter 319, etc.

The second control circuit 37 includes first and third comparators 371 and 373 that have different reference potentials, and second and third comparators that have different hysteresis characteristics from the first and third comparators 371 and 373, respectively.
Fourth comparator 372,374 and D-flip-flop 3
75.475, 1st, 2nd, 3rd timer circuit 376.4
76.377, inverter 378.478.381.3
82.481, OR circuit 379.479.383, transistor 380.480, AND circuit 384, etc.

Next, the operation of this embodiment in the above configuration will be explained. First, when it is desired to cool the interior of the vehicle in summer or the like, the cooling switch 34 is turned on. As a result, the first control circuit 31
Power is supplied to the When the air conditioner starts, the temperature detected by the temperature sensor 30 is higher than the set temperature (for example, 3"C), so the output of the comparator 310 goes to the "Hi" level, and the engine speed reaches the normal set value (for example, 750 r, p, m). ,)
Since the output of the comparator 312 becomes "Hi" level, as a result, the output of the AND circuit 314 becomes "H4" level, the relay 318 is energized via the transistor 316, and its contact 318a is closed, so that the electromagnetic clutch 21 is energized and the crankshaft 21 is connected, the rotational force of the engine is transmitted to the compressor 20, and the compressor 20 is operated. Furthermore, since the cooling switch 34 is closed and the refrigerator switch 8 is open, the output of the AND circuit 384 of the second control circuit 37 is always at the "Hi" level.
As a result, the output of the OR circuit 379 also becomes "Hi" level, and the transistor 380 becomes conductive. In addition, the OR circuit 38
Since the output of control valve 3 is also at the “H4” level, the output of control valve 2
9 is energized and the control valve 29 is always open. Further, the output of the OR circuit 479 also becomes "Hi" level, and the transistor 480 becomes conductive, so that the control valve 52 is similarly energized and opened.

When the compressor 20 operates, the refrigerant circulates through the cooling refrigerant circuit 27, and when the refrigerant evaporates in the cooling evaporator 25, it takes vaporization heat from the air, and the air is cooled by taking the vaporization heat away. is blown into the vehicle interior by the fan 26. At this time, since the evaporation pressure in the evaporator 25 is maintained at 2 to 3 kg/cI11G by the pressure reducing device 24, the pressure acting on the compressor suction side end of the refrigeration refrigerant circuit 28 is also about the same, so the control Even though the valve 52 is open, the constant pressure expansion valve 6 remains closed and there is no flow of refrigerant within the refrigerant circuit 28.

Similarly, since the constant pressure expansion valve 16 of the freezing refrigerant circuit 50 also remains closed, no refrigerant flows into the refrigerant circuit 50 either.

Next, when the refrigerator-freezer 60 is to be operated in this cooling operation state, the refrigerator switch 8 is turned on, so that the output of the AND circuit 384 of the second control circuit 37 is always at the "Lo" level, so that the Circuits 379 and 4
The output of 79 is unrelated to AND circuit 384. At the time of starting the freezing and refrigeration system, the detected temperature of the temperature sensor 5.15 is higher than the set temperature of any of the first to fourth comparators 371 to 374, so the outputs of these comparators are all "Hi".
level, and indicator lamps 9 and 19 are off. Also,
As the outputs of the second and fourth comparators 372.374 become "Hi" level, the D-flip-flop 375.4
The output Q of 75 becomes “Hi” level, and the output Q becomes “LO” level.
” level, and the first timer circuit 376 is activated by the output Q of the “Hi” level, and this first timer circuit 376 operates as shown in FIG.
” level, a pulse output that becomes “Hi” level for a time T2 (for example, 15 seconds) is continuously generated, and as a result, the transistor 38 is
0 is conducted for the time T1 and cut off for the time T2, which is repeated.

By turning on and cutting off the transistor 380, the control valve 29
The control valve 29 is in an open state when the control valve 29 is energized. Therefore, the control valve 29 repeats the operation of opening for the time T1 and closing for the time T2. Similarly, the second timer circuit 476 is at "LO" level for T4 time (for example, 69 seconds) and "H4" for T5 time (for example, 6 seconds) as shown in FIG.
The transistor 480 is turned on for the time T4 and cut off for the time T5 through the inverter 478 and the OR circuit 479, and this operation is repeated. By turning the transistor 480 on and off, the control valve 52 is turned on and off, and when the control valve 52 is turned on, it is in an open state. Therefore, the control valve 52 repeats the operation of opening for the T4 time and closing for the T5 time. Here, the first timer circuit 376 and the second timer circuit 476 generate pulse outputs in synchronization as shown in FIG.

Next, the behavior of the refrigeration cycle as the control valves 29 and 52 are opened and closed will be explained. First, when the control valve 29 closes, the flow of refrigerant to the cooling evaporator 25 is stopped, so the compressor 20
The suction pressure decreases rapidly and reaches 0.8 kg/cnl G in a short time, e.g. 1-2 seconds. Therefore, the constant pressure expansion valve 6 of the refrigerant circuit 28 for refrigeration opens, and the refrigerant begins to flow through the refrigerant circuit 28 for refrigeration. At this time, in the refrigeration refrigerant circuit 50, the set pressure of the constant pressure expansion valve 16 is 0.41qr/
Since it is crA G, it will not open and refrigerant will not flow. Then, the constant pressure expansion valve 6 sets the constant pressure side pressure to the set pressure (0, 8 +r
/cn(G), the evaporation pressure inside the refrigerating evaporator 43 is 0.8 kg/co! G, the evaporation temperature becomes -16°C, and the cold storage material (water) in the cold storage device 4 is made into ice. Then, when 9 seconds out of the 72 hours (15 seconds) have passed,
Since the control valve 52 is de-energized, the control valve 52 as well as the control valve 29 are closed. In this way, the control valve 52
When closed, the flow of refrigerant to the refrigeration refrigerant circuit 28 is stopped, so the suction pressure of the compressor 20 further decreases and reaches 0.4 kg/c++IG in a short period of time, for example, 1 to 2 seconds. Therefore, the constant pressure expansion valve 16 of the freezing refrigerant circuit 50 opens, and the refrigerant begins to flow through the refrigeration refrigerant circuit 50.

At this time, the constant pressure expansion valve 16 sets the low pressure side pressure to the set pressure (0,
4kg/cjG) 1.・6 freezing evaporator 5
3: evaporation pressure 0.4kg/cnlG, evaporation temperature -24
℃ state, and the cold storage material in the cold storage device 14 is made into ice.

Then, after the T5 time (6 seconds), the two control valves 29.52 are energized, so the control valves 29.52 return to the open state. Then, when the control valve 29 opens, the refrigerant is again supplied to the cooling evaporator 25, and the internal pressure of the evaporator 25 and the compressor suction side pressure return to 2 to 3 kg/c+dG.

This pressure is the pressure inside the evaporator 43.53 for refrigeration and freezing (
Although it is much higher than 0.8 kg/cn (G, 0.4 kg/c-〇), check valves 7.17 are installed downstream of the refrigeration and freezing evaporators 43.53. As a result, the refrigerant gas that has passed through the cooling evaporator 25 flows back into the refrigeration and freezing evaporators 43.53.
There is no sudden increase in internal pressure. on the other hand,
The constant pressure expansion valves 6 and 16 each have a set pressure of 0.8 on the low pressure side.
, O,' If it becomes higher than 4 kg/cot c, it will automatically close and stop the supply of refrigerant. Therefore, the evaporators 43 and 53 continue to make ice while the liquid refrigerant therein gradually evaporates. This state continues for a time T1 (for example, 60 seconds). Thereafter, by repeating the opening and closing of the control valves 29.52 according to the set times TI, T2, T4, and T5, the regenerator material (water) in the regenerator 4 is cooled by the evaporator 43. The cold storage material is cooled by the evaporator 53 and gradually freezes. Although the refrigerant does not flow to the cooling evaporator 25 for 72 hours (15 seconds) when the refrigerant flows to the refrigeration evaporator 43 or the freezer evaporator 53, the low temperature state is maintained due to the heat capacity of the evaporator 25. Therefore, the temperature of the blown air does not rise suddenly, and therefore the variation is smaller in the present invention than when the temperature of the blown air from the cooling evaporator 25 is controlled by continuing the electromagnetic clutch 21.

On the other hand, although the driver needs to know whether or not the cold storage is complete, the present inventors have found that there is a correlation between the surface temperature of the cold storage device 4.14 and the degree of cold storage (ice production amount). It has been experimentally discovered that ice making is completed 100% when the surface temperature of the case drops to 12°C. Also, the temperature of the regenerator 14 is -12℃.
When the temperature drops below, ice making is completed to 100%. Therefore, in the case of a refrigerator, the surface temperature of the case of the regenerator 4 is detected by the temperature sensor 5, and when the temperature drops to, for example, -2°C, the output of the first comparator 371 of the second control circuit 37 becomes "Hl". Since the level changes to "LO" and changes to a bell, the indicator light 9 lights up.On the other hand, in the case of a freezer, the surface temperature of the case of the moss cooler 14 is detected by the temperature sensor 15, and the temperature rises to -12°C, for example.
When the third comparator 373 of the second control circuit 37
Since the output of the output signal is reversed from the "Hi" level to the "LO" level, the indicator light 19 lights up, and the driver should check the two indicator lights 9.1.
By visually observing the lighting state of 9, it is possible to easily know whether the cold storage in the refrigerator or freezer is complete.

In addition, in the cool storage completion state where all the two indicator lights 9.19 are lit, the outputs of the second and fourth comparators 372.374 are also “H”.
i" level is inverted to "Lo" level, and the output Q of the D-flip-flop 375.475 becomes IILO" level,
The output Q becomes "Hi" level, and as a result, the first and second timer circuits 376 and 476 stop operating, and their output becomes "Hi" level.
'Lo is fixed to Lebel. On the other hand, the third timer circuit 37
7 starts the timing operation. When the output Q becomes "Hi" level, the output of OR circuit 379.479 becomes "Hi" level, so that OR circuit 379.4
79 remains at the "Hi" level, and the control valves 29 and 52 remain energized and open through the transistors 380 and 480, so that the refrigerant piping 2 for refrigeration and freezing
8. Refrigerant does not flow at 50. This state continues for a set time T3 of the third timer circuit 377, for example, 5 minutes, and the cold storage action is stopped. Therefore, during this period, the cooling effect is maximized.

Then, when the set time T3 of the third timer circuit 377 has elapsed, the output of the third timer circuit 377 is inverted from "LO" to "Hi" level, so that the third timer circuit 377 is reset to the initial state and the D- flip flop 375
．． A clock pulse is applied at 475. Therefore, if the outputs of the second and fourth comparators 372 and 374 remain at the LO level at this point, the output Q will maintain the LO and H4 states, so the During the set time T3 of the 3-timer circuit 377, the cold storage action is suspended.At the above-mentioned time point, the temperature detected by the temperature sensor 5.15 is high, and the outputs of the second and fourth comparators 372 and 374 are "Hi".
” level, the output Q is inverted to “Hl” and the output Q is inverted to “Lo”, so the first and second timer circuits 376 and 476 return to the operating state, and the above-mentioned T
, , generates pulse signals having time intervals of T2, T4, and T5, and opens and closes the control valve 29.52 repeatedly to perform a cold storage effect.

In this way, the second control circuit 37 performs the indicator light control function for displaying the degree of cooling, and at the same time performs the cold storage pause function when the cold storage is completed.

Further, the second control circuit 37 also performs an electromagnetic clutch control function in cooperation with the first control circuit 31, as described below. In other words, the cooling inside the vehicle progresses, and the cooling evaporator 2
5 decreases and the temperature detected by the temperature sensor 30 becomes lower than the set temperature of the comparator 310, the comparator 310
The output of the AND circuit 314 becomes "Lo" level, the contact 318a of the relay 318 is opened via the transistor 316, the electromagnetic clutch 2 is disengaged, and the compressor 20 is stopped. Cooling evaporator 25
frost is prevented. In this way, in order to prevent the evaporator 25 from frosting, the first and second timer circuits 3 of the second control circuit 37 operate even when the compressor 20 is stopped.
When 76.476 is operating and outputting a "Hi" level output (time T2), the output of this "Hi" level causes the transistor 3 to be activated, regardless of the output of the comparator 310.
16 is made conductive, the contact 318a of the relay 318 is forcibly closed, and the compression rM20 is activated. Since the control valve 29 is closed during the T2 time period, there is no adverse effect on the prevention of frost in the cooling evaporator 25. And the above T
The desired cold storage effect is achieved by forcing the compressor 2''0 to operate during the 2 hour period.

Similarly, when the cooling switch 34 is open,
During the above T2 time, a cold storage effect can be obtained by forcibly operating the compressor 20.

Note that if the rotation speed of the automobile engine drops below the set rotation speed (for example, 450 r, p, m, etc.) for some reason, the output of the comparator 312 becomes "Lo" level, which opens the relay contact 318a. The compressor 20 stops, preventing the engine from stopping.

Although the above-described embodiments show preferred embodiments of the present invention, the present invention can be implemented in a wide variety of ways as illustrated below.

(1) The first and second control circuits 31 and 37 can also be integrated by a control device using a microcomputer.

(2) The control valve 29.52 is not controlled by a fixed one-hour timer, but can also be controlled by automatically correcting the one-hour timer by detecting the cooling degree or evaporation pressure of the evaporator 43.53. Also, increase the closing time of control valve 29.52,
A manual quench switch that closes continuously may also be provided.

(3) The mounting position of the control valve 29.52 is not limited to the illustrated position, and may be mounted at any position in the cooling refrigerant circuit 27 or the refrigeration refrigerant circuit 28.

(4) In the refrigeration cycle shown in Fig. 1, a combination of a solenoid valve and a pressure reducing device (fixed throttle such as a capillary tube or orifice) is used instead of the constant pressure expansion valve 6, and this solenoid valve is closed when the control valve 29 opens. You can also do this. Further, in this case, the above-mentioned solenoid valve and control valve 29 can be replaced with one three-way switching solenoid valve.

(5) Similarly, the constant pressure expansion valve 16 can be replaced with a combination of a solenoid valve and a pressure reducing device.

(6) It is also possible to combine the two control valves 29, 52 into one control valve. That is, the inlet side of the constant pressure expansion valve 16 of the freezing refrigerant circuit 50 is directly connected to the outlet side of the liquid receiver 23, and a control valve is provided at the inlet branch point of the cooling refrigerant circuit 27 and the refrigeration refrigerant circuit 28. , this control valve is
During time T1 in the figure, the circuit 27 side is opened, and during time T4 in FIG. 5, the circuit 28 side is opened, and T2 in FIG.
The structure may be such that the circuit 27 side is closed for the time T5, and the circuit 28 side is closed for the time T5. Such a control valve may be implemented, for example, by a motor-driven rotor-type electric valve.

(6) The set pressures of the constant pressure expansion valve 6 and the constant pressure expansion valve 16 and the closing times T2 and T5 of the control valve 29.52 can be freely changed according to the target value of how much the inside of the refrigerator should be cooled. Of course it is possible.

(7) The evaporator 43.53 is not limited to one that cools the cold storage material in the cold storage device 4.14, but the present invention can of course be applied to one that directly cools the air inside the refrigerator.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a diagram of a refrigeration cycle including an electric circuit, Fig. 2 is a perspective view of the main parts inside the vehicle interior illustrating the installation position of a refrigerator-freezer, and Fig. 3 is a diagram of a refrigeration cycle including an electric circuit. FIG. 4 is an electric circuit diagram, and FIG. 5 is an explanatory diagram of the operation of the control valve 29.52. 20... Compressor, 22... Condenser, 29.52...
- Control valve, 27... Cooling refrigerant circuit, 28... Refrigerating refrigerant circuit, 50... Freezing refrigerant circuit, 31.37.
...Control circuit. □

Claims (3)

[Claims] (1) A compressor that compresses and discharges gas refrigerant, a condenser connected to the refrigerant discharge side of this compressor, and a condenser installed between the refrigerant outlet side of this condenser and the refrigerant suction side of the compressor. a refrigeration device provided in parallel with the cooling pressure reducing device and the cooling evaporator between the refrigerant outlet side of the condenser and the refrigerant suction side of the compressor; a pressure reducing device for refrigeration and a refrigeration evaporator; and a refrigeration pressure reducing device provided in parallel with the refrigeration pressure reducing device and the refrigeration evaporator between the refrigerant outlet side of the condenser and the refrigerant suction side of the compressor. a cooling refrigerant circuit including the cooling pressure reducing device and the cooling evaporator; and a cooling refrigerant circuit including the cooling pressure reducing device and the cooling evaporator. and a control circuit that repeatedly opens and closes the control valve at predetermined intervals. A refrigeration cycle device characterized by being configured to be lower. (2) A patent characterized in that the refrigeration evaporator is installed in a case of a refrigerator-freezer, and the refrigeration evaporator is installed in a freezer that is independently partitioned within the case. A refrigeration cycle device according to claim 1. (3) The refrigeration cycle according to claim 1 or 2, wherein the refrigeration evaporator and the refrigeration evaporator are each configured to cool a cold storage material in a cold storage device. Device.