JPS62228852A - 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 Industrial Application] The present invention relates to a cold storage type vehicle refrigerator that can keep the inside of the refrigerator cool even when the vehicle is parked.

[Conventional technology]

This type of cold storage type vehicle refrigerator is described in Japanese Patent Application Laid-open No. 179344/1989, which was previously proposed by the applicant. The refrigerant is cooled and frozen by a refrigerating evaporator when the vehicle is stored and the vehicle is running (blank below).
When the vehicle is parked, the interior of the refrigerator is cooled by the latent heat of fusion of the cool storage agent.

[Problem that the invention seeks to solve]

However, in the conventional technology described above, since the inside of the refrigerator is kept cool by natural convection, there is a problem that the temperature balance inside the refrigerator tends to become large.

Furthermore, since the refrigerator is configured to cool the inside of the refrigerator after the cold storage agent is cooled by the refrigeration evaporator, there is a problem in that the temperature inside the refrigerator cannot be quickly lowered when the refrigerator is started.

In view of the above-mentioned points, an object of the present invention is to provide a cold storage type vehicle refrigerator that can quickly cool the inside of the refrigerator at the time of startup and uniformly cool the inside of the refrigerator by causing forced convection of the air inside the refrigerator.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides a case consisting of a heat insulating structure having a door that can be opened and closed; (b) a refrigerating evaporator installed in the case; and (c) a case installed in the case. and a blower that causes forced convection of the air cooled by the refrigeration evaporator within the case; (f) a cold storage agent installed around the cold storage room in the case; and a cold storage evaporator installed to cool the cold storage agent. Adopt.

[Effect]

According to the above technical means, by forcing the air inside the refrigerator case to circulate with the blower, the inside of the refrigerator, that is, the refrigerator compartment, can be cooled at a relatively uniform temperature. By forcing air to flow through a separate refrigeration evaporator house, the inside of the refrigeration room can be quickly cooled.

Furthermore, by freezing the cold storage agent while the vehicle is running, the refrigerating compartment can be cooled favorably by the latent heat of fusion of the cold storage agent when the vehicle is parked.

〔Effect of the invention〕

Therefore, according to the present invention, a good effect of cooling the inside of the refrigerator can be achieved when the vehicle is running, and at the same time, a cooling effect of the inside of the refrigerator can be obtained when the vehicle is parked.

〔Example〕

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

1 and 2 illustrate the specific structure of the regenerator type vehicle refrigerator according to the present invention, and the case l of the vehicle refrigerator according to the present invention has a double resin member 23a made of polyethylene, polypropylene, etc. , 23b has a so-called double wall structure. Furthermore, a heat insulating material 22 such as hard polyurethane is injected between the double walls to improve heat insulation properties. A door 2, which similarly has a double wall structure and a heat insulating material such as hard polyurethane, is connected to the case 1 by a hinge 3, which can be opened and closed by a screw 2.
It is fixed at 4. In addition, a magnet 25 is attached to the periphery of the door 2.
A rubber member 25 having a built-in rubber member 25 is fixed in a U-shape, and this rubber member 25 is reliably attracted and fixed to an iron plate 26 fixed to the open end surface of the case 1 by magnetic force. The bottom of the case 1 is formed into a stepped shape, and a grid 11 for air intake is fixed on the step 1a, and the air sucked from the grid 11 is arranged between the step 1b and the IC. A flowing cold air passage 27 is formed. As shown in FIG. 3, the evaporator storage case 15 has a double wall structure made of polyethylene or polypropylene, and is inserted into the grooves 1d and 1e of the case 1. An opening 15a for a freezer compartment 110 is formed in the front of this case 15, and is opened and closed by a freezer door 16. This freezer door 16
is connected to the case 15 by a hinge 32.

Note that the upper front part of the case 15 is the refrigeration evaporator part 108b.
A grid 31 is formed extending to the front of the blower 1.
It is designed to allow the wind from 12 to pass through.

The refrigeration evaporator 108 housed in the case 15 has a structure as shown in FIG. 1o8b, both of which are 108a,
108b is composed of a series of multi-hole flat tubes bent in a serpentine shape, with refrigerant inlet vibes 108 at both ends.
c is connected to the refrigerant outlet vibrator 108d. Also,
Corrugated fins 8 are provided in the refrigeration evaporator section 108b so as to efficiently cool the air from the blower 112.

As shown in FIG. 5, the cold storage evaporator 117 is composed of a multi-hole flat tube bent into a U-shape, and is installed in the case 1 so as to surround the outer circumference of the refrigerator compartment 111. . Inside the cold storage evaporator 117 (
As shown in FIG. 1, in the refrigerator compartment 111 side, a cold storage agent pack 118 in which a cold storage agent is sealed inside an easily deformable bag body such as a resin film is arranged, and a cooling plate 119 made of metal such as aluminum is installed. As a result, the cold storage evaporator 117 and the cold storage agent pack 118 are brought into close contact for good heat conduction. Here, the cool storage agent pack 118 usually uses several independent packs. The lower end of the cooling plate 119 is inserted into a groove 1f provided in the case 1, and the upper end is fixed to the case 1 with screws or the like.

A cold storage agent, such as water, sealed inside the cold storage agent pack 118 is cooled and frozen by the cold storage evaporator 117, and after the refrigeration cycle is stopped, the inside of the refrigerator compartment 111 is kept at a low temperature by its latent heat of fusion.

As shown in FIG. 2, the refrigerant inlet vibrator 117a of the refrigerant evaporator 117 is connected to the refrigerant outlet vibrator 108d of the refrigerant evaporator 108, and the refrigerant outlet vibrator 117b of the refrigerant evaporator 117 is connected to a check valve. It is connected to the outlet side refrigerant pipe 19 via 109. In addition, the refrigeration evaporator 10
The refrigerant inlet vibrator 108c of No. 8 is connected to the inlet side refrigerant pipe 18 via a constant pressure expansion valve 106 that constitutes a pressure reducing device for a refrigerator. Therefore, the refrigerant is 18 → 106 → 108 cm
108a→108b-108d-117a=117→1
It flows in the order of 17b→109-19.

An ice tray 13 is placed on the tube of the freezing evaporator section 108a located in the freezer compartment 110, and ice is made by cooling the water in the ice tray 13.

The constant pressure expansion valve 106 has a downstream pressure (that is, the evaporator 1
08.117 side refrigerant pressure) is the set value, for example 0.5
kg/ci G (For refrigerant R-12, evaporation temperature -
When the temperature drops to 21°C, the valve opens and the refrigerant flow rate is adjusted thereafter to maintain the set pressure.

The constant pressure expansion valve 106, check valve 109, etc. are all housed in the case 1, and the refrigerant pipes 18 and 19 are also housed in the case 1.
project to the outside of the case 1, and are connected to the refrigeration cycle shown in FIG. 6, which will be described later.

The check valve 109 is configured so that the refrigerant pressure in the refrigerant pipe 19 on the suction side is set to 0.5 kg/cm by the constant pressure expansion valve 106.
CII! If the temperature exceeds G, the refrigerant is removed from the evaporator 108.1.
It has a structure that prevents the flow from flowing backward to the 17 side.

The blower 112 directs the air inside the refrigerator compartment 111 to the cold air passage 2.
7-Blower 112-Fin 8 of refrigeration evaporator section 108b
- forced convection in the path of the refrigerator compartment 111, including a sirocco fan 112a, a fan drive motor 112b,
It consists of a fan casing 112C and the like.

Note that the case 1 is equipped with a hinge 1d integrally molded with resin, and by being able to open and close at the position of the hinge 1d, the blower 112 and the evaporator 1 into the case 1 are
This is to facilitate assembly of 08.117 etc. It is also possible to integrally mold the hinge 3 of the door 2 with resin, and in this case, the case 1 and the door 2 can be integrally molded.

Further, the refrigerator of the present invention may be installed at an appropriate position in the vehicle interior, for example, at the lower part of the instrument panel at the front of the vehicle interior of a wagon vehicle.

FIG. 6 shows an example of a refrigeration cycle when the vehicle refrigerator of the present invention is implemented in combination with a refrigeration cycle for vehicle air conditioning.

The compressor 100 is coupled to a drive shaft of an automobile engine (not shown) via an electromagnetic clutch 101. In this example, the compressor 100 uses a 10-cylinder swash plate compressor, of which 9 cylinders are configured as a main compression section 100a for cooling, and the remaining 1 cylinder is configured as a sub-compression section 100b for refrigeration. ing. In this case, each compression section 1 of the compressor 100
00a and 100b are each provided with an air-conditioning suction port 100e and a refrigeration suction port 100f independently, so that each compression section can independently set a different suction pressure. Furthermore, the cooling compression section 100a and the refrigeration compression section 100b communicate with each other through a communication path 100d at the end of the suction stroke.
The refrigerant (R12) with different pressures sucked from the respective suction ports 100e and 100f passes through the communication path 10 before being compressed in the respective compression sections 100a and 100b.
0d, and after being raised to the pressure of the cooling refrigerant, it is compressed in each compression section 100a, 100b, and is discharged to the outside of the compressor from a common discharge port 100c.

A discharge port 100c of the compressor 21 is connected to a condenser 102a, and a discharge side of the condenser 102a is connected to a receiver 103. A solenoid valve 1 is provided on the discharge side of the receiver 103.
04e, pressure reducing device for cooling, in this example temperature-activated expansion valve 1
04a, and a cooling evaporator 104b connected to this, and on the air upstream side of this evaporator 104b,
A cooling air blowing fan 104C is provided. The refrigerant outlet side of the evaporator 104b is connected to the cooling suction port 100e of the compressor 100 via a cooling suction pipe 104f.

On the other hand, the constant pressure expansion valve 106, the refrigeration evaporator 108, the cold storage evaporator 117, and the check valve 109 of the vehicle refrigerator described above are the electromagnetic valve 104e, the cooling expansion valve 104a, and the evaporator 1.
04b is provided in parallel. The check valve 109 is
It allows refrigerant gas to pass only in one direction toward the compressor suction side, and the discharge side of this check valve 109 is connected to the refrigeration suction port 100f of the compressor 100 by a refrigeration suction pipe 109a. There is.

The cooling suction pipe 104f and the refrigeration suction pipe 109a
A communication pipe 104g that directly communicates these is provided between the two, and a solenoid valve 104d is provided on this communication pipe 104g, and when the solenoid valve 104d is opened, the suction pipe 10
4f and 109a are in direct communication.

Further, the solenoid valve 104e provided on the upstream side of the cooling vacuum bag R104a blocks the refrigerant from flowing into the cooling evaporator 104b side passage.

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

In FIG. 6, 206 is a vehicle battery, 207 is a key switch (ignition switch) for the vehicle engine, and is a cooling switch 202 or a refrigerator switch 2.
Power is supplied to the control circuit 201 via 03.

On the air downstream side of the cooling evaporator 104b, a temperature sensor 204 made of a thermistor is provided to detect the temperature of the blown air. Temperature sensor 20 consisting of a thermistor that detects the temperature of a surface that is not in contact with it
5 are provided, and these are connected to the control circuit 201. This control circuit 201 includes the temperature sensor 204.20.
The electromagnetic clutch 101 and the electromagnetic valves 104d and 104e are controlled as shown in Table 1 on the next page based on the detection signal No. 5 and the like.

(Left below) The set temperature of the cooling side temperature sensor 204 is the temperature of the cooling evaporator 1.
04b is set to 3° C., for example, to prevent frosting, and the set temperature of the cold storage agent pack side temperature sensor 205 is set to a temperature at which it is determined that solidification of the entire cold storage agent (water) is completed, for example, −5° C.

In this case, it goes without saying that each set temperature may have hysteresis.

Next, the operation of this embodiment will be explained. First, a case will be described in which the air conditioner switch 202 and the refrigerator switch 203 are both in the ON state (operation mode No. 1 in Table 1) when the vehicle interior temperature and the refrigerator interior temperature are both high. switch 202.20
The electromagnetic clutch 101 and the electromagnetic valves 104d and 104e are controlled as shown in 111111 of Table 1 based on the ON signal of No. 3 and the detection signal of the temperature sensors 204 and 205. As a result, the electromagnetic clutch 101 becomes connected,
The driving force of the automobile engine is transmitted to the compressor 100, and the compressor 11100 rotates to compress refrigerant gas. At this time, since the solenoid valve 104d of the communication passage 104g is closed, the cooling refrigerant from the cooling suction pipe 104f flows into the compressor 1.
00 cooling intake port 10Qe, and the refrigeration intake pipe I
The refrigeration refrigerant from Q9a is independently sucked into the refrigeration suction port 100f of the compressor 100.

Here, as described above, the refrigeration compression section 100b of the compressor 100 is connected to the communication path 1 at the end of the suction stroke (near the bottom dead center).
Since it communicates with the cooling compression section 100a via 00d,
The pressure inside the refrigeration compression section 100b is the same as that of the cooling compression section 100a.
Due to the inflow of refrigerant from the
For example, it increases to 2.5 kg/cdG. Therefore, the recompression units 100a and 100b both have +r/a of 2.5.
Compress the refrigerant at a pressure of dG. This compressed refrigerant gas is mixed and discharged from the discharge port 100c, cooled and liquefied by the condenser 102a.

This liquefied refrigerant is stored in the receiver 103 and reduced to its respective pressure by the action of the constant pressure expansion valve 106 and the temperature-operated expansion valve 104a, and then the evaporator 108.117
, and 104b, respectively.

Here, to explain in detail the function of the refrigerator, the refrigerant pipe 1
8, the refrigerant first passes through the constant pressure expansion valve 106, and this valve 1
Due to the throttling action of 06, the refrigerant reaches the set pressure of 0.5kg/cn.
! The pressure is reduced to below, and the evaporation temperature of the refrigerant is -21℃,
The refrigerant cools the ice tray 13 in the freezing evaporator section 108a to perform ice making. And this freezing evaporator section 108a
The refrigerant that has passed through cools the blown air through the corrugated fins 8 in the refrigerating evaporator section 108b. This blown air, that is, the cold air
- Blower fan casing 112a - Refrigeration evaporator section 1
It circulates through the fin 8-refrigeration compartment 111 route of 08b. In addition, the grid 11 is placed at the end of the refrigerator compartment 111 (the right end in FIG. 1).
By locating the refrigerator compartment 111, the cold air is spread throughout the refrigerator compartment 111. Therefore, 10 cans of drinking water in the refrigerator compartment lLl
Objects to be refrigerated, such as the following, are effectively cooled by the forced circulation of cold air.

The refrigerant that has passed through the refrigeration evaporator section 1oab cools and freezes the cold storage agent pack 118 in the cold storage evaporator 117.

Here, in this embodiment, since the constant pressure expansion valve 106 is used as the expansion valve for the refrigerator, when the heat load of the freezer compartment 110 and the refrigerator compartment 111 is large (that is, when the temperature of the stored items in the refrigerator is low) ), the refrigerant is supplied to the freezing evaporator section 108.
The refrigerant is almost completely evaporated in the refrigerating evaporator section a and the refrigerating evaporator section 108b, and the vaporized refrigerant flows into the cold storage evaporator 117.

Therefore, when the heat load inside the refrigerator is large, most of the latent heat of vaporization of the refrigerant is used for cooling the interior of the refrigerator, so that the interior of the refrigerator can be cooled effectively. On the other hand, if the temperature of the vehicle/vehicle's stored items is low, or if there are no stored items (in advance,
0), the heat load is small, so the freezing evaporator section 108a and the refrigerating evaporator section 10
8b, the refrigerant hardly evaporates, but evaporates in the cold storage evaporator 117, so the latent heat of evaporation of the refrigerant is mostly used for cooling and freezing the cold storage pack 118.

That is, with the configuration of this embodiment, an easy-to-use and efficient refrigerator operating method in which the cold storage agent pack 118 is frozen after the stored items 10 in the refrigerator are cooled can be realized without the need for a special control device or the like. It is possible without using

In this way, due to the cooling effect of the refrigerant, the freezer compartment 110, the refrigerator compartment 111, and the cold storage agent pack 118 are sequentially cooled, and finally, the cold storage agent (for example, water) in the cold storage agent pack 118 freezes, and the The temperature drops below 0°C. When the cold storage agent is completely frozen, the cold storage agent pack 118
Since the temperature sensed by the temperature sensor 205 attached to the surface of the refrigerant drops below the set temperature, which is -5°C in this example, the state shown in Case 3 of Table 1 occurs, and the solenoid valve 104d is opened (so that the refrigerant is not It does not flow to the refrigerator side, but all flows to the air conditioner side.

During cooling of this refrigerator, when the cooling load is small, i.e. when the outside temperature is low or when sunlight is weak, the normal cooling refrigeration cycle is used to control the cooling side capacity (to prevent frosting). The electromagnetic clutch 101 is ON-OFF controlled based on the temperature detected by the temperature sensor 204, but in this embodiment, instead of turning off the electromagnetic clutch 101 and stopping the entire refrigeration cycle,
By closing the solenoid valve 104e at the inlet of the cooling side refrigerant circuit and opening the solenoid valve 104d at the communication path 104g, all the refrigerant flows to the refrigerator side.
4b to prevent frosting and at the same time improve the cooling performance of the refrigerator. This mode of operation is No. 2 in Table 1 above.

Above, we have described the state in which both the cooling switch 202 and the refrigerator switch 203 are ON, but by turning each switch ON-OFF, the operation type a(m
3) and the operating mode only on the refrigerator side (Nl12
) is also possible.

Further, when both switches 202 and 203 are OFF, the electromagnetic clutch 101 is OFF, and the compressor 100 is
stops, so the flow of refrigerant stops.

On the other hand, when the vehicle is parked, the vehicle engine key switch 20
7 is opened and the vehicle engine is stopped, so the refrigeration cycle shown in FIG. Sometimes cold storage pack 1
The latent heat of fusion of 18 can keep the refrigerator compartment 111 cold.

Here, since the cold storage agent pack 118 and the cooling plate 119 are formed in a U-shape so as to surround the outer periphery of the refrigerator compartment 111, even if the forced convection by the blower 112 is stopped,
The entire refrigerator compartment 111 can be kept uniformly cold.

Note that the blower 112 and evaporator 10 inside the case 1
8.117, the arrangement form of the cold storage agent pack 118 etc. is not limited to the one shown in the figure, and can be modified in various ways. For example, as in other embodiments shown in FIGS. A freezing evaporator section 108a for cooling the ice tray 13 may be installed in the freezing chamber 110, which is formed below. In this example, since the freezing evaporator section 108a and the refrigerating evaporator section 108b are separated, the two 108a and 108b are connected by a connecting bi 1108e. 120 is an opening/closing lid of the freezer compartment 110.

Further, in the above embodiment, the ice making function is obtained by providing the freezing evaporator section 108b, but it goes without saying that the present invention can also be applied to a refrigerator that does not have the ice making function. The blower 112 is connected to the refrigerator compartment 11.
Intermittent control may be performed depending on the temperature of the temperature. Figures 9 to 11
The figure shows an embodiment in which the present invention is applied to such a refrigerator, in which the refrigeration evaporator 108 is provided with only the refrigeration evaporator part 108b having the fins 8, and the refrigeration evaporator part 108b in the above-mentioned embodiment is An evaporator section 108a (for ice making) is not provided. The air in the refrigerator compartment 111 is sucked into the air inlet of the blower 112 through the air inlet 11, and is then passed through the air outlet of the blower 112 to the refrigeration evaporator 10 through a duct (not shown).
8, where it is cooled and becomes cold air, which flows into the refrigerator compartment 11.
It is designed to blow out into the air. In addition, refrigeration evaporator 1
Temperature sensor 20 consisting of a thermistor at the cold air outlet of 08
8 is additionally installed, the detection signal of this temperature sensor 208 is input to the control circuit 201, and the air blower [1
It is designed to control 12 rotation speeds.

FIG. 11 shows a specific configuration of the control circuit 201 in this example.
02 and a refrigerator switch 203.
9 is provided with first to third comparators 210 to 212 and logic element groups (213 to 223) such as AND circuits and OR circuits. A reference voltage corresponding to each determination temperature is applied to the first to third comparators 210 to 212 by a reference voltage generation circuit 225 to which a constant voltage is supplied from a constant voltage circuit 224.

226 to 228 are drive circuits, 229 is a clutch drive relay, 230.231 is a control relay for the blower 112,
232 is a current limiting resistor for the blower 112. The solenoid valves 104e and 104d are of a type that closes when energized and opens when energization is interrupted.

Next, to explain the operation of this embodiment, when the engine key switch switch 207 is closed and the air conditioner switch 202 is turned on while the automobile engine is operating, the temperature sensor 204 will be activated when the air conditioner starts. Since the detected temperature is higher than the set temperature (for example, 3° C.), the output of the first comparator 210 in the control circuit 201 becomes Hi level.
The relay 229 is energized via the AND circuit 216, the OR circuit 218, and the clutch drive circuit 226, and the relay contacts are closed, so that the electromagnetic clutch 101 is energized. As a result, the compressor 100 is connected to the automobile engine via the electromagnetic clutch 101 and starts operating. Also, at this time, when the refrigerator switch 203 is turned off, the AND circuit 2
Since the outputs of 13 and 219 are at Lo level, and the output of AND circuit 215 is also at Lo level, OR circuit 22
0 becomes Lo level, the output of the drive circuit 227 becomes Lo level, and the cooling side solenoid valve 104e is not energized, so this solenoid valve 104e is opened.

On the other hand, since the output of the AND circuit 213 is at the Lo level, the output of the AND circuit 222 is at the LO level, which causes the output of the drive circuit 228 to be at the LO level, and the solenoid valve 104d is also not energized and becomes open. This results in
In the refrigeration cycle shown in FIG. cylinders) are used for cooling. Then, when the temperature detected by the temperature sensor 204 that detects the temperature of the cooling evaporator 104b falls to the set temperature (for example, 2° C.), the output of the comparator 210 changes to LO.
level, the electromagnetic clutch 101 is de-energized via the AND circuit 216, the OR circuit 218, the clutch drive circuit 226, and the relay 229, and the compressor 100 is stopped.

In this way, by intermittent operation of the compressor 100 according to the detection signal of the temperature sensor 204, the cooling evaporator 10
4b to prevent frosting.

Next, when the refrigerator switch 203 is turned on while the cooling switch 202 is turned on (simultaneous cooling/refrigeration operation), when a long time has passed since the last operation of the refrigerator, the cold storage agent pack 118 inside the refrigerator The temperature has risen to the same level as inside the vehicle. Therefore,
At the beginning of operation of the refrigerator, the temperature detected by the temperature sensor 205 is higher than the set temperature of 2° C., so the output of the comparator 211 is at Hi level, and the output of comparator 212 is also at Hi level. At this time, if the temperature detected by the temperature sensor 204 on the cooling side is higher than 3°C, the comparator 210
The output is also at Hi level. Then, by turning on both switches 202 and 203, the output of the exclusive OR circuit 214 becomes LO, and the output of the AND circuit 215 becomes LO. In addition, the AND circuit 219 includes a comparator 210
Since the Hi level output of is input inverted, the output becomes Lo. Therefore, the output of the OR circuit 220 is LO
As a result, power supply to the cooling side solenoid valve 104e is cut off, and this solenoid valve 104e opens.

On the other hand, both outputs of AND circuits 213 and 221 are Hi.
Therefore, the output of the AND circuit 222 becomes Hi, energizes the solenoid valve 104d, and closes the solenoid valve 104d.

Then, the communication path 104g is cut off in the refrigeration cycle, so the cooling refrigerant flows from the cooling suction pipe 104f to the cooling suction port 100g of the compressor 100, and the cooling refrigerant flows from the cooling suction pipe 109f to the refrigeration suction port 100f. Refrigerant refrigerant is sucked in from each independently. As a result, refrigerant flows simultaneously into both the cooling side circuit and the refrigeration side circuit,
Air conditioning and refrigeration are operated simultaneously. At this time, when the refrigerator switch 203 is turned on, the relay 230 is turned on, and at the same time, the H1 output of the comparator 212 turns on the relay 231 via the AND circuit 223, so the resistor 232 is shorted and the motor 112b of the blower 112 is powered on. A voltage is directly applied, and the blower 112 rotates at high speed (Hi).

Thereafter, the blower 112 adjusts the set temperature of the comparator 212 (in this example, 18°C) according to the temperature detected by the refrigerator cold air temperature sensor 208.
and -10°C), high speed (f(i) rotation and low speed (L
o) The temperature inside the refrigerator compartment 111 is controlled by automatically switching the rotation.

On the other hand, in the above cooling/refrigeration simultaneous operation mode, when the temperature detected by the cooling side temperature sensor 204 falls below 2°C, the output of the comparator 210 becomes LO, so the AND circuit 219
The output becomes Hi, and the OR circuit 220 and drive circuit 227
The solenoid valve 104e is energized via the solenoid valve 104e, and the solenoid valve 104e is closed. On the other hand, the outputs of AND circuits 221 and 222 are LO
Therefore, the power to the solenoid valve 104d is turned off via the drive circuit 228, and the solenoid valve 104d opens. Therefore, by closing the solenoid valve 104e, refrigerant is prevented from flowing into the cooling evaporator 104b, thereby preventing frost, and at the same time, by opening the solenoid valve 104d, all suction ports 10 of the compressor 100 are prevented from flowing into the cooling evaporator 104b.
Refrigerating refrigerant is sucked into 0e and 100f, and the compressor lOO
All cylinders are used for refrigeration.

Next, when the cooling inside the refrigerator progresses and the temperature of the cold storage agent pack 118 falls below O''CC, freezing of the cold storage agent (in this example, water) starts, and the water in the cold storage agent pack 118 is completely When the temperature is frozen and the cold storage is completed, the temperature detected by the temperature sensor 205 drops below -5°C, so the output of the comparator 211 becomes LO, and the outputs of the AND circuits 221 and 222 become LOW.
0, the electromagnetic valve 104d is de-energized via the drive circuit 228, and the electromagnetic valve 104d opens.

Therefore, all cylinders of compressor 100 are used for cooling.

On the other hand, since the output of the comparator 211 becomes LO, the output of the AND circuit 217 also becomes LO.

Therefore, when the output of the comparator 210 becomes Lo due to the detection signal of the cooling side temperature sensor 204 and the output of the AND circuit 216 becomes LO, the output of the OR circuit 218 becomes Lo,
Power to the electromagnetic clutch 101 is turned off, and the compressor 100
stops.

Next, when the cooling switch 202 is turned off and only the refrigerator switch 203 is turned on, the output of the AND circuit 215 is always Hi, so the OR circuit 220 and the drive circuit 227
The solenoid valve 104e is always energized and closed via the solenoid valve 104e. on the other hand,
Since the outputs of the AND circuits 213 and 222 are always LO, the output of the drive circuit 228 is LO, and therefore the solenoid valve 104d is not energized and remains open. On the other hand, since the output of the comparator 211 is Hi at first, the AND circuit 2
17 becomes Hi, and the output of OR circuit 218 becomes Hi.
Therefore, the electromagnetic clutch 101 is energized and the compressor 1
00 is activated. Solenoid valve 104e is always closed, solenoid valve 10
4d is always open, all cylinders of the compressor 100 are used for refrigeration, and all refrigerant circulates through the circuit on the refrigerator side. In this state, the cold storage pack temperature sensor 205
continues until the detected temperature drops to 15°C, and when this detected temperature drops below 15°C, the output of the comparator 211 becomes Lo, and the outputs of the AND circuit 217 and the OR circuit 218 become LO. The electromagnetic clutch 101 is de-energized and the compressor 100 is stopped.

The above-mentioned operation can be summarized as shown in Table 19 below. Table 1 shows the detected temperatures of the two temperature sensors 205 and 208 on the refrigeration side and each device (104e, 104d, 112,
Table 2 shows the relationship between the temperatures detected by the cooling side temperature sensor 204 and the cold storage agent pack temperature sensor 205 and the on/off state of the electromagnetic clutch 101.

(Leaving space below) Table 2 In the above-mentioned embodiment, the constant pressure expansion valve 106 was used as the pressure reducing device for the refrigerator, but in addition to this, a temperature-operated expansion valve, a combination of a fixed throttle and a solenoid valve, etc. You can also.

Furthermore, the connection relationship between the refrigerating evaporator 108 and the cold storage evaporator 117 is not limited to that shown in FIGS. The positional relationship between the side and downstream side is shown in Figure 6 and Figure 1.
It may also be reversed from Figure 0.

Further, the tubes of the evaporators 108 and 117 may be configured using round tubes instead of multi-hole flat tubes.

Also, instead of using the cold storage pack 118,
As shown in Japanese Patent No. 0-179344, etc., the cold storage agent and the cold storage evaporator 117 may be housed in a common metal container, and this container may be installed so as to surround the outer periphery of the refrigerator compartment 111.

In addition, in the embodiments shown in FIGS. 9 to 11, the blower 1
Although the speed of the blower 12 is switched to two stages, high speed ()Ii) and low speed (Lo), the blower speed may be switched to three or more stages. Also, after the low speed (LO) state, the blower 1
12 may be added. Furthermore, the speed of the blower 112 may be linearly controlled according to the temperature detected by the temperature sensor 208.

In addition, in the embodiment shown in FIGS. 9 to 11, the temperature sensor 20B
The temperature of the cold air blown out from the refrigerating evaporator 108 is detected by the temperature sensor 208, which is installed in a position in the refrigerating compartment 111 where the cold air does not blow directly onto it. may be detected.

゛ Also, the cooling side solenoid valve 104e is replaced with the cooling expansion valve 10.
It may be installed downstream of 4a instead of upstream.

Furthermore, the refrigeration cycle for a refrigerator and its control method can be modified in various ways. For example, as described in Japanese Patent Application Laid-Open No. 57-207776, a tie compressor 100 is installed on the cooling side and the refrigeration side, and suction ports 100e and 100f are provided for cooling and refrigeration. The present invention can also be applied to a refrigeration cycle that uses a compressor that does not have a communication mechanism 100d inside it, even if it has an independent communication mechanism 100d.

Furthermore, the refrigerator cycle may be configured independently from the cooling cycle.

[Brief explanation of drawings]

All the drawings show embodiments of the present invention, and FIG. 1 is a cross-sectional view of the refrigerator of the present invention, and a cross-section taken along line AA in FIG. 2 is shown. FIG. 2 is a transparent perspective view of the refrigerator of the present invention, FIG. 3 is an exploded perspective view of the case 15 portion of FIG. 1, FIG. 4 is a perspective view of the refrigerating evaporator 108, and FIG. , FIG. 6 is a refrigeration cycle diagram including an electric circuit, FIG. 7 is a perspective view showing another embodiment of the evaporator configuration, and FIG. 8 is a cross section of a refrigerator using the evaporator configuration of FIG. 7. It is a diagram. FIG. 9 is a perspective view showing another embodiment of the refrigerator of the present invention;
Figure 10 is a refrigeration cycle diagram including the refrigerator in Figure 9,
FIG. 1 is an electric circuit diagram for electrically controlling the refrigeration cycle of FIG. 10. 1... Case, 2... Door, 10B... Refrigeration evaporator. 111... Refrigerator room, 112... Blower, 117...
・Evaporator for cold storage, 118... Cold storage agent pack. Representative Patent Attorney Takashi OkabeFigure 3M4Figure 5Figure 7Figure 8

Claims (5)

[Claims] (1) (a) A case consisting of a heat insulating structure with a door that can be opened and closed; (b) a refrigeration evaporator installed within this case; (c)
) a blower installed in the case to force convection of air cooled by the refrigeration evaporator in the case; (d) formed to be able to accommodate objects to be cooled in the case; a refrigerating room in which air is forced to undergo forced convection by a blower; (f) a cold storage agent installed around the refrigerating room within the case; and (g) a cold storage evaporator installed to cool the refrigerant. A vehicle refrigerator equipped with. (2) The refrigerating evaporator is located on the upstream side, and the cold storage evaporator is located on the downstream side thereof, and both evaporators are connected in series to a refrigeration cycle. Refrigerator for vehicles. (3) Claim 1, wherein the cold storage agent is configured as a cold storage pack enclosed in an easily deformable bag, and the cold storage pack is disposed in close contact with a tube constituting the cold storage evaporator. Or the vehicle refrigerator according to paragraph 2. (4) The vehicle according to any one of claims 1 to 3, wherein the blower is configured so that its speed is automatically controlled according to a temperature related to the degree of cooling of the refrigerator compartment. refrigerator. (5) Any one of claims 1 to 4, wherein the refrigerant flow to the refrigeration evaporator and the cold storage evaporator is controlled according to the temperature of the cold storage agent. Refrigerator for the vehicle mentioned.