JPS62233646A - Cooling refrigerating 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 [Industrial Application Field] The present invention relates to a cooling/refrigerating device suitable for use in automobiles, and is particularly directed to an improved refrigeration cycle for cooling/refrigerating.

[Conventional technology]

Typical automotive refrigerators include those that introduce cold air from an air conditioner, and those that incorporate a dedicated refrigeration evaporator branched from the cooling refrigeration cycle.

The latter type with a built-in evaporator can set the cooling temperature inside the refrigerator to a low temperature regardless of the temperature of the cold air on the air conditioner side, so it has the advantage of being able to add an ice-making function, and is therefore being adopted in recent products. It is heading towards around 1, when the number increases.

The present applicant had previously proposed an automobile air-conditioning/refrigeration system with a built-in evaporator in Japanese Patent Application Laid-Open No. 60-48463. A cooling evaporator is connected to the cooling inlet, and a refrigeration evaporator is connected to the refrigeration inlet. The solenoid valve in the communication path connecting the two suction ports is opened so that the cooling refrigerant is also drawn into the refrigeration suction port.

In addition, by providing two independent suction ports in the compressor as described above, it is possible to independently set the evaporation pressures in the cooling evaporator and the refrigeration evaporator.
For example, in a refrigerating evaporator, 1.2 kg/cll
IG (In the case of refrigerant R-12, the evaporation temperature is -10.5℃
) to obtain the ice-making function.

[Problem that the invention seeks to solve]

By the way, unlike home-use refrigerators, the temperature of a car refrigerator rises to the same temperature as the inside of the car at the beginning of operation. There is a problem in that unless the inside of the refrigerator is rapidly cooled at the beginning of operation, cold items such as canned juice cannot be kept cold at a low temperature.

To solve this problem, the flow rate of the refrigeration refrigerant can be increased to increase the cooling capacity of the refrigeration evaporator, but simply increasing the flow rate of the refrigeration refrigerant in this way will
The refrigerant flow rate on the cooling side decreases, resulting in a decrease in cooling capacity.
There is a problem in that the air conditioning inside the vehicle is insufficient.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide an air-conditioning/refrigeration device that can rapidly cool the inside of a refrigerator while minimizing a decrease in cooling capacity.

[Means for solving problems]

In order to achieve the above object, the present invention provides the following steps: ia) A cooling inlet and a refrigeration inlet are provided independently;
The refrigerant sucked from both suction ports is compressed, and 1
a compressor configured to discharge from two discharge ports; (bl) a condenser provided on the refrigerant discharge side of the compressor and condensing the gas refrigerant into liquid refrigerant; (c) a refrigerant outlet side of the condenser. a cooling evaporator installed on the refrigerant outlet side of the cooling pressure reducing device to reduce the pressure of the refrigerant; (f) a cooling suction pipe that communicates the refrigerant outlet side of the refrigerant to the cooling suction port of the compressor; and (f) a cooling suction pipe provided on the refrigerant outlet side of the condenser in parallel with the cooling pressure reducing device to reduce the pressure of the refrigerant. A refrigeration pressure reducing device, fgl; a refrigeration suction pipe that communicates the refrigerant outlet side of the evaporator with the refrigeration suction port; (i) a communication passage that communicates the cooling suction pipe and the refrigeration suction pipe; 01 Opening and closing this communication passage; (k) an electric control means for controlling opening and closing of the valve means; (1) the electric control means maintains the valve means in an open state so that the cooling inlet and the refrigeration inlet are controlled; A cooling independent operation mode in which the cooling refrigerant from the cooling suction pipe is sucked into each of the cooling suction ports, and a cooling refrigerant from the cooling suction pipe is sucked into the cooling suction port while the valve means remains closed. and a cooling/strong refrigeration operation mode in which the refrigerant is sucked into the refrigerating suction port from the refrigerating suction pipe; A cooling/weak refrigeration operation mode is set in which the cooling refrigerant is sucked into the cooling suction port, and the cooling refrigerant and the refrigeration refrigerant are alternately sucked into the refrigeration suction port at the predetermined time interval. Adopt technical means to configure the system so that it can be used.

[Action and effect]

According to the above technical means, when it is necessary to rapidly cool the inside of the refrigerator, such as when starting up the refrigerator, the electric control means sets the cooling/strong refrigerating operation mode, and the refrigerant that has passed through the refrigeration evaporator The flow rate of the refrigerant can be increased by continuously drawing the refrigerant into the refrigerating inlet of the compressor, thereby increasing the refrigerating capacity and rapidly cooling the inside of the refrigerator.

On the other hand, after the inside of the refrigerator has been cooled to a certain extent, the cooling/low refrigeration operation mode is set by the electric control means, so that the refrigerant for cooling and the refrigerant for refrigeration are alternately sucked into the refrigeration suction port of the compressor. As a result, the flow rate of the cooling refrigerant can be increased and the cooling capacity can be increased.

In other words, in the present invention, when performing simultaneous cooling and refrigeration operation, the flow rate of the refrigerant is increased to increase the refrigeration capacity only under conditions that require rapid refrigeration, and at other times, the cooling capacity is reduced due to the refrigeration operation. It is possible to increase the cooling capacity compared to conventional devices with a small size.

〔Example〕

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings. FIG. 1 is a diagram showing an automobile refrigeration cycle that simultaneously cools a vehicle interior and refrigerates articles.

The compressor 10 is coupled to a drive shaft of an automobile engine (not shown) via an electromagnetic clutch 11. In this example, the compressor 1O is a swash plate type with 10 cylinders, of which 8 cylinders are configured as a main compressor 10a for cooling, as shown in FIG. , 10c.

In this case, each compression section 10a, 10b of the compressor 10.

10c is independently provided with a cooling inlet 10d and refrigeration inlets 10e and 10f.

In addition, a main compressor section 10a for cooling and a first compression section 10 for refrigeration are provided.
b is in communication with the first communication passage Log near the bottom dead center of the suction stroke, and connects the cooling compression section 10a and the refrigeration second compression section 1.
0c is communicated by the second communication passage toh near the bottom dead center of the suction stroke, and the refrigerant (R12) having different pressures sucked from each suction port 10d, 10e, and 10f is compressed in each compression section. 10g communication path and 10 communication path in front
h, and after being raised to the pressure of the cooling refrigerant, it is compressed in each compression section, and is discharged through a common discharge port 10.
It is designed to be discharged from i.

Here, since the specific structure and operation of the communication passages 10g and 10h are the same as those of the compressor described in Japanese Patent Application Laid-open No. 60-48463, a detailed explanation will be omitted and only the main points will be described. Now, the pressure of the low-pressure refrigerant for refrigeration is 1
．． 2kg/cJG, the pressure of low pressure refrigerant for cooling is 2.5kg
/aJG, when the low-pressure cooling refrigerant flows into the two cylinders constituting the refrigeration compression units 10b and 10c via the communication passage Log, 10h and mixes with the low-pressure refrigerant, the refrigerant in the two cylinders The pressure is the pressure at the start of compression in the other eight cylinders constituting the main compression section 10a, that is, 2.5k
It becomes approximately equal to g/cJG.

Therefore, the compression stroke in the two refrigeration cylinders starts at almost the same pressure as the compression start pressure of the other eight cooling cylinders, and the refrigerant compressed here joins with the refrigerant discharged from the other eight cylinders, and is discharged toward the condenser 22 from the discharge port IQi.

As mentioned above, the first. Second refrigeration compression section 10b, 10
In c, the refrigerant can be compressed by the piston from the same pressure state as the cooling compression part 10a, so the compressor 10 saves power compared to the case where compression is performed from different suction pressure states, and Refrigeration compression section 10b, 1
Since the cooling refrigerant also flows into 0c through the communication passages 10g and 1Qh, the flow rate of the cooling refrigerant can be further increased than that for 8 cylinders, which is advantageous in terms of cooling capacity. FIG. 3 is a partially cutaway perspective view showing an outline of the compressor 10 described above.

In this example, the first inlet lOe and the second inlet are used as the refrigerating inlets.
Although two suction ports 10f are provided, if it is possible to install a mechanism inside the compressor 10 that divides the refrigerant refrigerant from one suction port into two cylinders and inhales the refrigerant, of course can be combined into one.

The discharge port 10i of the compressor 10 is connected to a condenser 12, as shown in FIG. 1, and the discharge side of the condenser 12 is connected to a receiver 13. On the discharge side of the receiver 13 is a solenoid valve 35. Air-conditioning pressure reducing device.

In this example, a temperature-operated expansion valve 14 and a cooling evaporator 15 connected thereto are provided, and a cooling air blowing fan 16 is provided on the air upstream side of the evaporator 15. . A cooling suction pipe 1 is installed on the refrigerant outlet side of the evaporator 15.
7 is connected to the cooling inlet LQd of the compressor 10. Furthermore, a temperature sensor 18 is installed on the air outlet side of the evaporator 15 to detect the temperature of the blown air, the fin surface temperature, etc., and this temperature sensor 18 is made of a thermistor. The above-mentioned devices 14, 15, 16, 18, 35, etc. constitute a cooling unit 19 for cooling.

A refrigeration cooling unit 20 is provided in parallel with the t-magnetic valve 35, expansion valve 14, and evaporator 15 of the air-conditioning refrigeration unit 19.
is a constant pressure expansion valve 21 which is a specific example of a pressure reducing device for refrigeration;
It has a refrigerating evaporator 22 connected thereto, and a check valve 23 that allows refrigerant gas to pass only in one direction toward the compressor suction side.

The discharge side of this check valve 23 is connected to a refrigerating suction pipe 24, and this suction pipe 24 is connected to two suction pipes, that is, a first refrigerating suction pipe. The first suction pipe 25 is connected to the first refrigerating inlet toe of the compressor 10, and the second suction pipe 26 is connected to the second refrigerating inlet 10f of the compressor 10. It is connected to the. The constant pressure expansion valve 21
The valve opens when the downstream pressure, that is, the pressure inside the refrigerating evaporator 22, falls below a set pressure, for example, 1.2 kg/cdG, and the valve opening degree is adjusted so as to maintain the set pressure.

A solenoid valve 31 is installed in a communication passage 30 that directly connects the cooling suction pipe 17 and the refrigeration suction pipe 24, and when the solenoid valve 31 is opened, the two pipes 17 and 24 are brought into direct communication. ing.

The refrigerating evaporator 22 includes a cold storage material container 32, as described later.
The outer surface temperature of the cold storage material container 32 is detected by a temperature sensor 33 consisting of a thermistor, and the control circuit 34 controls the opening and closing of the solenoid valve 31 according to the detection signal of the temperature sensor 33. It is meant to be controlled.

Further, the detection signal of the temperature sensor 18 of the air-conditioning cooling unit 19 is also manually inputted to the control circuit 34, and depending on the detection signal of the temperature sensor 18, the electromagnetic clutch 11 is switched on/off and the electromagnetic valve 3
It is designed to control the opening and closing of 5.

Next, the electrical control section of the refrigeration cycle device will be explained with reference to FIG. It is connected. The control circuit 34 includes both the above switches 42.4.
The determination circuit 40 includes first to fourth comparators 41 to 44 and logic element groups (45 to 56) such as AND circuits and OR circuits. and is provided. The first to fourth comparators 41 to 44 include
A reference voltage generating circuit 60 to which a constant voltage is supplied from a constant voltage circuit 59 applies a reference voltage corresponding to each determination temperature. 61 to 64 are drive circuits, and 65 is a clutch drive relay.

In addition, the solenoid valves 31 and 35 close when energized, and the 11 fl
It is the type that opens when the electricity is cut off.

Next, the specific structure of a refrigerator incorporating the refrigerating cooling unit 20 shown in FIG. 1 will be explained with reference to FIG. It can be installed in the console, rear luggage compartment, etc.

A door 72 is provided on the top surface of a case 71 of the refrigerator 70 so as to be openable and closable. The case 71 of the refrigerator 70 is a box with a so-called double wall structure using double resin members made of polyethylene or polypropylene, etc., and hard polyurethane or the like is placed between the double walls to improve heat insulation. It is injected with insulation material. The door 72 similarly has a structure combining a double wall structure and a heat insulating material such as hard polyurethane, and can be opened and closed freely by a hinge (not shown).
1 is connected.

As shown in FIG. 5, the constant pressure expansion valve 21 and the check valve 23 are both disposed within the case 71, and the refrigeration evaporator 22 connected downstream of the constant pressure expansion valve 21 is It is constructed from an aluminum flat tube 22a integrally molded with a large number of refrigerant passages, and this flat tube 22a is arranged along the inner surface of the case 71. Therefore, the flat tubes 22a are arranged on all four inner surfaces of the case 71.

A refrigerating cold storage container 32 is disposed on the inner surface of the flat tube 22a of the refrigerating evaporator 22 so as to be in close contact with the flat tube 22a. In this example, the refrigerating cold storage container 32 is made of aluminum foil, soft resin, etc. A large number of cold storage banks sealed with cold storage material are placed side by side inside an easily deformable bag. Since water is used as the cold storage material in the cold storage container 32, its freezing point is 0°C.

After arranging the evaporator 28 and the cool storage container 32 as described above, a cooling plate 73 made of a metal with excellent thermal conductivity such as aluminum or stainless steel is placed in close contact with the cool storage container 32 inside the cool storage container 32. It is set up. This cooling plate 73 for refrigeration is formed in the shape of an opening with its upper and lower surfaces opened,
A portion near the upper end thereof is fastened to the case 71 by screws (not shown).

Note that the temperature sensor 33 that detects the temperature of the refrigerating cold storage container 32 described above is connected to the refrigerating evaporator 22 as shown in FIG.
The cooling plate 73 is tightly fixed between the cold storage container 32 located at the most downstream side of the flat tube 22a.

Next, the operation of this embodiment in the above configuration will be explained. Now, when the engine key switch 66 is closed and the automobile engine is running, if you turn on the cooling switch 67, the temperature detected by the temperature sensor 18 will be higher than the set temperature (for example, 3°C) when the cooling starts. , the output of the first comparator 41 becomes Hi level in the control circuit 34, and the AND circuit 48, the OR circuit 50 . The relay 65 is energized via the Kučić drive circuit 61, and the relay contacts are closed, so that the electromagnetic clutch 11 is energized. As a result, the compressor 10 is connected to the automobile engine via the electromagnetic clutch 11 and starts operating. At this time, the output of the AND circuit 47 becomes Lo level due to the refrigerator switch 68 being turned off, and the output of the AND circuit 51 is also Lo level, so the output of the OR circuit 52 becomes Lo level, and the output of the drive circuit 62 becomes Lo level. level, and the solenoid valve 35 is not energized, so the solenoid valve 35 opens.

On the other hand, since the output of the AND circuit 45 is at Lo level,
The outputs of the AND circuits 54 and 56 become LO level, which causes the outputs of the drive circuits 63 and 64 to become LO level,
The solenoid valve 31 is also not energized and is in an open state. As a result, the communication passage 30 is opened in the refrigeration cycle shown in FIG.
All of the air is sucked into the three suction ports 10d, 10e, and 10f of the compressor 10, and all cylinders (10 cylinders) of the compressor 10 are used for cooling. When the temperature detected by the temperature sensor 18 that detects the temperature of the cooling evaporator 15 falls to the set temperature (for example, 2° C.), the output of the comparator 4I becomes LO level, and the AND circuit 48. OR circuit 50. Clutch circuit 61.
The electromagnetic clutch 11 is de-energized via the relay 65, and the compressor 1° is stopped. In this way, the temperature sensor 18
Frosting of the cooling evaporator 15 is prevented by intermittent operation of the compressor 10 in response to the detection signal.

Next, the case where the refrigerator switch 68 is further turned on while the cooling switch 67 is turned on will be explained.
When a long time has passed since the refrigerator was last operated, the temperature of the cold storage material container 32 inside the refrigerator has risen to the same temperature as the inside of the vehicle. Therefore, at the beginning of operation of the refrigerator, the temperature detected by the temperature sensor 33 is higher than 10°C, so the outputs of the comparators 67 and 44 become Hi level, and the comparator 68
The output is at Lo level. Further, at this time, if the temperature detected by the temperature sensor 18 on the cooling side is higher than 3° C., the output of the comparator 41 is at Hi level.

Then, the output of the AND circuit 54 becomes H4, and the output of the AND circuit 56 becomes Lo level, so the output of the drive circuit 63 becomes Hi, energizes the solenoid valve 31, and closes the solenoid valve 31. At this time, the pulse drive circuit 64 does not operate and its output remains at Lo. Since the communication path 30 of the refrigeration cycle is cut off by closing the electromagnetic valve 31, the cooling air from the cooling suction pipe 17 is supplied to the cooling suction port 10d of the compressor 10, and the cooling air from the cooling suction pipe 17 is supplied to the cooling suction port 10d of the compressor 10. 2nd intake port IQe
, 10f independently draw in refrigerant from refrigeration suction pipes 24, 25, and 26.

The refrigerant gas discharged from the compressor 10 is cooled and condensed by the condenser 2 (P4-Pl in FIG. 6), and the liquefied refrigerant is stored in the receiver 13. This liquefied refrigerant is depressurized by the action of the temperature-operated expansion valve 14 for cooling and the constant pressure expansion valve 21 for refrigeration, and becomes a low-temperature, low-pressure gas-liquid two-phase refrigerant (P+-Pz and PI-'' in Fig. 6).
PS ) is then evaporated in the evaporator 15.22 (P z = P 3 and Ps = Pa) in Figure 6, taking away heat from the surroundings.

The refrigerant that has passed through the cooling evaporator 15 then passes through the pipe 17 and enters the main compression section 10 of the compressor 10 from the cooling suction port 10d.
It is inhaled into the cylinders (8 cylinders) that constitute part a. On the other hand, the refrigerant that has passed through the refrigeration evaporator 22 passes through the check valve 23. Piping 24
．． 25 and 26, and is sucked into the refrigeration suction ports 10e and 10f, and further constitutes the refrigeration sub-compression parts 10b and 10c.
It is inhaled into each cylinder.

Here, the refrigeration sub-compression section 10b, loc is connected to the communication passage 10g at the end of the suction stroke as described above.

10h, the cooling refrigerant that has passed through the cooling evaporator 15 flows into the cooling main compression section 10a, so that the cooling refrigerant pressure (for example, 2.5 kg/an! G) is communicated with the cooling main compression section 10b. The toc pressure increases (Pi-P3 in FIG. 6).

Therefore, all cylinders of compression) alo are 2.5 kg/
Compress the refrigerant at a pressure of ctA G. Then, the refrigerant supplied to the refrigeration cooling unit 20 is supplied to the constant pressure expansion valve 21 (
Due to the action of the set pressure 1.2 kg/cJAG), the evaporation pressure in the refrigeration evaporator 22 is 1.2 kg/cal.
G, the evaporation temperature becomes -10.5℃, and the cold storage container 3
The cold storage material (water) inside 2 is gradually frozen.

In this way, when the temperature detected by the temperature sensor 33 is higher than the first set temperature (10,), the refrigeration refrigerant is continuously sucked into the two refrigeration cylinders of the compressor 10. The flow rate is increased and rapid refrigeration can be performed.

In the above-mentioned state, when the temperature detected by the cooling side temperature sensor 18 falls below 2° C., the output of the comparator 41 becomes LO, so the output of the AND circuit 51 becomes Hi, and the OR circuit 52. The solenoid valve 35 is energized via the drive circuit 62,
Solenoid valve 35 closes.

On the other hand, since the outputs of AND circuits 53 and 54 become Lo,
Power to the solenoid valve 31 is turned off via the drive circuit 63,
Solenoid valve 31 opens. Therefore, when the solenoid valve 35 is closed, the flow of refrigerant to the cooling evaporator 15 is blocked to prevent frosting, and at the same time, when the solenoid valve 31 is opened, all suction ports 10d and 10e of the compressor IO are closed.

A refrigerant for refrigeration is sucked into 10f, and all cylinders of the compressor 10 are used for refrigeration.

Next, cooling inside the refrigerator progresses and the refrigerator side temperature sensor 33
When the detected temperature falls below 10°C and is between 10°C and -2°C, the output of the comparator 42 becomes LO, and the output of the comparator 42 becomes LO.
The output of 3 becomes Hi. As a result, the AND circuit 53.
The output of the drive circuit 54 becomes LO, and the output of the drive circuit 63 becomes LO. However, the outputs of the AND circuits 55 and 56 become Hi, and the pulse drive circuit 64 starts operating. This pulse drive circuit 64 has a built-in well-known pulse generation circuit that generates a rectangular wave pulse signal as shown in the figure, and drives the solenoid valve 31 by the pulse signal, and in this example, it is ON for 30 seconds ( It is designed to generate pulse signals of Hi) and 30 seconds OFF (LO). Therefore, the solenoid valve 31 repeats the operation of opening for 30 seconds and closing for 30 seconds, and only when the solenoid valve 31 closes, the refrigerating inlet
, 10f, and when the solenoid valve 31 is opened, cooling refrigerant is sucked into the refrigeration suction ports 10e and 10f. At this time, the pressure of the cooling refrigerant (2.5 kg/c
dG) is higher than the pressure of the refrigerant for refrigeration (1.2 kg/ad
G), the check valve 23 closes and prevents the cooling refrigerant from flowing into the refrigerator.

As mentioned above, the refrigeration inlet 10e of the compressor 10.

As the cooling refrigerant and the refrigeration refrigerant alternately flow into 10f for 30 seconds each, the refrigeration sub-compression sections 10b and 10c in the compressor 10 are used 50% each for cooling and refrigeration, and therefore The refrigeration compressor sections 10b and 10c essentially function as one cylinder for refrigeration, and the other cylinder essentially functions for cooling.

Therefore, the flow rate of the refrigerant for refrigeration decreases and the refrigerating capacity decreases, but in addition to the fact that the temperature of the cold storage container 32 has already decreased to 10° C. or less, the space inside the automobile refrigerator is Generally, it has a relatively small storage space of about 10 cans of juice, so even if the refrigeration capacity is halved from two compressor cylinders to one cylinder, there will be no problem in cooling the inside of the refrigerator. On the other hand, since the cooling capacity increases by one cylinder of the compressor, the cooling effect in the vehicle interior can be increased by that amount.

Next, when the water in the cold storage container 32 completely freezes and cold storage is completed, and the temperature detected by the refrigeration side temperature sensor 33 falls below 2°C, the outputs of the comparators 43 and 44 both become Lo,
The outputs of the AND circuits 55 and 56 become Lo, the pulse drive circuit 64 stops operating, and its output becomes LO. At this time, since the output of the drive circuit 62 maintains LO,
The energization of the solenoid valve 31 remains off, and the solenoid valve 31
opens the valve. Therefore, all cylinders of the compressor IO are used for cooling.

On the other hand, since the output of the comparator 44 becomes LO, the output of the AND circuit 49 also becomes LO. Therefore, when the output of the comparator 41 becomes Lo due to the detection signal of the cooling side temperature sensor 18 and the output of the AND circuit 48 becomes LO, the OR circuit 5
The output of 0 becomes Lo, power to the electromagnetic clutch 11 is turned off, and the compressor 10 is stopped.

Next, when the cooling switch 67 is turned off and only the refrigerator switch 68 is turned on, the output of the AND circuit 47 is always Hi, so the OR circuit 52. The solenoid valve 35 is always energized and closed via the drive circuit 62. On the other hand, since the output of the AND circuits 45 and 54 is always Lo, the drive circuit 63
The output of becomes Lo. Furthermore, since the output of the AND circuit 56 is always at Lo, the pulse drive circuit 64 is not activated and the output is always at Lo. Therefore, the electromagnetic valve 31 is not energized and remains open. On the other hand, since the output of the comparator 44 is Hi at first, the output of the AND circuit 49 becomes Hi.
Since the output of the OR circuit 50 becomes Hi, the electromagnetic clutch 1
1 is energized, and compressor ``0'' operates. Since the solenoid valve 35 is always closed and the solenoid valve 31 is always open, the compressor 1
All cylinders of 0 are used for refrigeration, and all refrigerant circulates through the circuit on the refrigerator side. In this state, the refrigerator side temperature sensor 3
This continues until the detected temperature of the AND circuit 49. The output of the OR circuit 50 is L
o, the electromagnetic clutch 11 is de-energized and the compressor 10 is stopped.

The above operations can be summarized as shown in Table 12 below. Table 1 shows the temperature detected by the cooling side temperature sensor 18 and the solenoid valve 3.
Table 2 shows the relationship between opening and closing of temperature sensor 3 on the refrigerator side.
Table 3 shows the relationship between the detected temperature of No. 3 and the opening/closing of the electromagnetic valve 31, and Table 3 shows the detected temperature of both temperature sensors 18 and 33 and the on/off state of the electromagnetic clutch 11. (The following is a blank space) Note that the present invention is not limited to the illustrated embodiments described above, and can be modified widely, and typical modified examples will be listed below.

(1) When using a swash plate type multi-cylinder compressor 10, the number of refrigerating compression parts is not limited to two cylinders, but it goes without saying that the number of compressors for refrigeration may be increased or decreased as appropriate depending on the capacity required for the refrigerator. be.

(2) In addition to the swash plate type multi-cylinder compressor 10 as described above, a vane type compressor as described in JP-A-60-48463 can also be used. In that case,
If the refrigeration suction port and the cooling suction port are sequentially opened in descending order of suction pressure along the rotational direction of the rotor, the cooling side suction pressure in the cylinder of the vane compressor is 2.5 kg/adc. It becomes possible to start compressing the refrigerant.

(3) As the pressure reducing device on the refrigeration side, in addition to the constant pressure expansion valve 21, a temperature-operated ordinary expansion valve, a combination of a solenoid valve and a fixed throttle, etc. can be used.

(4) The control circuit 4 may be constructed using a microcomputer that performs digital arithmetic processing instead of using an electric circuit as shown in FIG.

(5) The set pressure of the constant pressure expansion valve 21 can be freely changed depending on the temperature at which the inside of the refrigerator is desired to be cooled, the freezing temperature of the cold storage material, and the like.

(6) As the cold storage material, anything other than water may be used, and the cold storage material and the refrigerating evaporator 22 may be housed in one cold storage container.

(7) The present invention is not limited to a refrigerant storage type in which a cold storage material is cooled by the refrigerating evaporator 22, but can also be applied to a refrigerant in which the air inside the refrigerator is directly cooled by the evaporator 22. In that case,
It does not matter whether or not an internal fan is used.

(8) Instead of the solenoid valve 31, 35, an electric control valve that opens and closes the valve body by the displacement of a piezoelectric element or a motor-operated valve can be used.In short, any electric control valve can be used. Can also be used with valves.

(9) The refrigerator switch 68 may be provided with three operating positions: an off position, a strong refrigeration position, and a weak refrigeration position, and the opening and closing of the solenoid valve 31 may be controlled based on the manual operation of the refrigerator switch 68. good.

α [In the above embodiment, the judgment temperatures of the refrigeration side temperature sensor 33 were set to 10°C and -2°C, but for example, the freezing start temperature of the cold storage material (water) is 0°C, and the freezing completion temperature is -2°C. (or −4° C.), and this determination temperature can be changed in various ways.

When setting the OD weak refrigeration operation, the solenoid valve 31 is not opened and closed at a fixed ratio as described above, but the opening/closing ratio is continuously (linearly) changed according to the temperature detected by the temperature sensor 33. good.

@It is also possible to eliminate the solenoid valve 35 in cases where there is no need to set refrigeration independent operation.

03 In the above-mentioned embodiment, a case was explained in which communication passages 10g and 10h were provided inside the compressor 10 to communicate the cooling compression section 10a and the refrigeration compression sections 10b and 10c near the bottom dead center of the suction stroke. However, a refrigeration cycle using a compressor that does not have the communication passages 10g and lOh, the cooling compression section and the refrigeration compression section are formed independently, and only the discharge port 10i is shared The present invention can be carried out in exactly the same manner also in the case (previously proposed by the present applicant in Publication No. 17664).

[Brief explanation of drawings]

All drawings show embodiments of the present invention, and the first
The figure is a refrigeration cycle diagram of the present invention, and Figure 2 is the pressure in mm of Figure 1.
1o, FIG. 3 is a partially cutaway perspective view of the same compressor 10, FIG. 4 is an electric circuit diagram of the device of the present invention, FIG. 5 is a transparent perspective view of the refrigerator with the door open, and FIG. 6 is a Mollier diagram of a refrigeration cycle. 10...Compressor, 101...Discharge port, 10d...
Cooling inlet, foe, 10f...Refrigerating inlet 0.1
2... Condenser, 14... Cooling pressure reducing device, 15...
・Evaporator for cooling, 17...Suction piping for air conditioning, 21...
・Refrigerating pressure reducing device, 22...Refrigerating evaporator, 24,2
5.26...Refrigerating suction piping, 30...Communication path, 3
1... Valve means. 33... Temperature sensor, 34... Control circuit (electrical control means). 10i, OL hot mouth 31. Blue + class Figure 1 Figure 2 Figure 5 Figure 6

Claims (3)

[Claims] (1) (a) A compressor configured to independently provide a cooling suction port and a refrigeration suction port, compress refrigerant sucked in from both suction ports, and discharge the refrigerant from a single discharge port; (b) a condenser that is provided on the refrigerant discharge side of the compressor and condenses the gas refrigerant into liquid refrigerant; (c) a cooling pressure reducing device that is provided on the refrigerant outlet side of the condenser that reduces the pressure of the refrigerant; (d) Provided on the refrigerant outlet side of this cooling pressure reducing device,
a cooling evaporator that evaporates refrigerant to cool cooling air; (e) a cooling suction pipe that communicates a refrigerant outlet side of the cooling evaporator with a cooling inlet of the compressor; (f) (g) a refrigeration pressure reduction device provided on the refrigerant outlet side of the condenser in parallel with the cooling pressure reduction device to reduce the pressure of the refrigerant; (g) provided on the refrigerant outlet side of the refrigeration pressure reduction device;
a refrigeration evaporator that cools the inside of the refrigerator by evaporating refrigerant at a lower evaporation pressure than that of the refrigeration evaporator; and (h) a refrigeration suction that communicates the refrigerant outlet side of the refrigeration evaporator with the refrigeration intake port. (i) a communication path that communicates the cooling suction pipe with the refrigeration suction pipe; (j) a valve means for opening and closing the communication passage; and (k) electricity for controlling opening and closing of the valve means. (l) The electric control means controls the cooling refrigerant from the cooling suction pipe to both the cooling suction port and the refrigeration suction port while keeping the valve means open. a cooling independent operation mode in which the cooling refrigerant is sucked in from the cooling suction pipe, and the cooling refrigerant from the cooling suction pipe is sucked into the cooling suction port while the valve means remains the valve closing means; A cooling/intense refrigeration operation mode in which the cooling refrigerant is sucked into the cooling refrigerant; and the cooling refrigerant is sucked into the cooling suction port by sequentially opening and closing the valve means at predetermined time intervals; A cooling/weak refrigeration operation mode in which the cooling refrigerant and the refrigeration refrigerant are alternately sucked into the cooling inlet at the predetermined time interval. (2) The electric control means includes a detection means for detecting the cooling state of the refrigeration evaporator, and based on the detection signal of the detection means, the cooling only operation mode and the cooling/low refrigeration operation mode are selected. Claim 1 is configured to automatically switch between the cooling and strong refrigeration operation modes.
The cooling and refrigeration equipment described in Section 1. (3) The cooling and refrigerating device according to claim 1 or 2, wherein the refrigeration evaporator is configured to cool a cold storage material.