JP2002081825A - Refrigerator-freezer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator-freezer capable of improving cooling performance further by effectively utilizing available power in the refrigerator-freezer of which refrigerator installed side by side is cooled by circulating cold from a heat exchanger inside a freezer. SOLUTION: An electric fan 62 is stopped when the cooling of the inside of a freezer A is necessary and the cooling of the inside of a refrigerator B is not necessary, and surplus power generated by the stop of the electric fan 62 is fed to an electric fan 15. When the heat is well absorbed from the refrigerant a condenser 2 and the pressure is decreased, the power fed to an electric fan 12 can be decreased as the capacity to the electric fan 12 can be decreased without a problem and the power fed to either or both of the electric fan 15 and the electric fan 62 can be increased according to the amount of the decreased power.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator for distributing cold heat from a single heat exchanger to a refrigerator and a refrigerator arranged side by side, and particularly to a refrigerator for use in a vehicle. is there.

[0002]

2. Description of the Related Art As a prior art, for example,
There is a refrigerator-freezer disclosed in No. 9171. In this refrigerator, a freezer and a refrigerator are arranged side by side, an evaporator as a heat exchanger for generating cold air is arranged in the freezer, and the inside of the freezer is provided through a cold air inlet / outlet provided on a partition wall of the freezer and the refrigerator. The cool air is also circulated and supplied into the refrigerator by a refrigerator circulation fan provided at a cool air outlet from the freezer.

[0003] The evaporator is provided with a freezer circulation fan for blowing cool air in the freezer to the evaporator to generate cool air. In addition, a condenser fan, which is provided outside the freezer and the refrigerator and forms a part of the refrigerating cycle together with the evaporator, is provided with a condenser fan for passing outside air through the condenser.

[0004] The power supplied during the operation of the condenser fan, the freezer circulation fan, and the refrigerator circulation fan is fixed within the range of the power that can be supplied to each fan when the engine that drives the generator is idling. There is a known type that controls on / off of a condenser fan and a freezer circulation fan in accordance with the internal temperature, and controls on / off of the refrigerator circulation fan in accordance with the refrigerator internal temperature.

[0005]

However, in the above prior art, when the temperature in the refrigerator reaches a set temperature, for example, the supply of power to the refrigerator circulation fan is stopped.
A surplus power can be supplied, but even if the temperature inside the freezer is equal to or higher than the set temperature, it is necessary to increase the amount of air blown by the freezer circulation fan to the evaporator by using the generated power. There is no.

When the inside temperature of the freezer is equal to or higher than the set temperature, the condenser fan is driven. However, when the outside air temperature is low or the condenser receives running wind, the amount of air generated by the condenser fan is reduced. Even if there is no problem, the ON state for supplying a constant power more than necessary to the condenser fan is continued. Therefore, at this time, even if the temperature in the freezer or refrigerator is higher than the set temperature, the power supplied to the condenser fan is reduced, and the supply to the condenser fan is reduced by driving the freezer circulation fan or the refrigerator circulation fan. Therefore, there is no need to use the electric power that has surplus power.

As described above, in a refrigerating refrigerator in which the supply power at the time of driving the condenser fan, the freezer circulation fan and the refrigerator circulation fan is fixed, and the respective fans are turned on / off, the respective components are controlled when the engine for driving the generator is idling. In some cases, all the power that can be supplied to the fan is not used, and at this time, there is a problem that the cooling performance of the freezer and the refrigerator is not sufficiently exhibited.

[0008] The present invention has been made in view of the above points, and it is an object of the present invention to provide a refrigerator-freezer which can further improve the cooling performance by effectively utilizing the power that can be supplied.

[0009]

To achieve the above object, according to the first aspect of the present invention, a freezer (A) and a refrigerator (B) are provided side by side, and air in the freezer (A) is evaporated. A refrigerator-freezer (100) for cooling in (5) and circulating cool air in a freezer (A) into a refrigerator (B) for cooling.
In the case where the temperature in the freezer (A) is equal to or higher than a predetermined value, the supply of power to the refrigerator circulation fan (62) is stopped when the temperature in the refrigerator (B) becomes lower than the predetermined value. At the same time, the freezer circulation fan (15) depends on the amount of electric power for which the supply to the refrigerator circulation fan (62) is stopped.
Control means (3) for controlling the power supplied to
00).

According to this, when it is necessary to cool the freezer (A) and the refrigerator (B) does not need to be cooled, the control means (300) stops the refrigerator circulation fan (62). Then, the electric power which has surplus due to the stoppage of the refrigerator circulation fan (62) is supplied to the freezer circulation fan (15). Therefore, the inside of the freezer (A) is quickly cooled. In this way, the cooling performance of the freezer (A) can be further improved by effectively using the power that can be supplied.

According to a second aspect of the present invention, in the first aspect of the present invention, the control means (300) is configured to control the compressor when the temperature in the freezer (A) is equal to or higher than a predetermined value. When the pressure of the refrigerant before being decompressed by the decompression means (4) becomes equal to or lower than a predetermined value after being compressed in (1), the supply of power to the condenser fan (12) is reduced, and the condenser fan is reduced. (12) According to the reduced power supply,
Freezer circulation fan (15) or refrigerator circulation fan (6
It is characterized in that control is performed so as to increase the power supplied to at least one of 2).

According to this, when it is necessary to cool at least the inside of the freezer (A), the heat absorption from the refrigerant in the condenser (2) is good because the outside air temperature outside the condenser (2) decreases. When the pressure of the refrigerant is reduced, the control means (300) reduces the supply of electric power to the condenser fan (12) because there is no problem even if the air volume of the condenser fan (12) is reduced. According to the reduced power, the power supplied to one or both of the freezer circulation fan (15) and the refrigerator circulation fan (62) is increased.

Therefore, one or both of the freezer (A) and the refrigerator (B) is quickly cooled.
In this way, the cooling performance of the freezer (A) and the refrigerator (B) can be further improved by effectively utilizing the power that can be supplied.

Further, since unnecessary operation of the condenser fan (12) can be suppressed, the durability of the condenser fan (12) can be improved.

According to the third aspect of the present invention, the freezer (A) and the refrigerator (B) are provided side by side, and the air in the freezer (A) is cooled by the evaporator (5), and the freezer (A) is cooled. In the refrigerator (100) that cools by circulating the cool air in the refrigerator (B) into the refrigerator (B), when the temperature in the refrigerator (A) is equal to or higher than a predetermined value, the refrigerator (1) is compressed by the compressor (1). Later, when the pressure of the refrigerant before the pressure is reduced by the pressure reducing means (4) becomes equal to or less than a predetermined value, the power supply to the condenser fan (12) is reduced and the supply to the condenser fan (12) is reduced. A control means (300) for controlling so as to increase the power supplied to at least one of the freezer circulation fan (15) and the refrigerator circulation fan (62) in accordance with the reduced power. Features.

According to this, as in the second aspect of the invention, when at least the inside of the freezer (A) needs to be cooled, the outside air temperature outside the condenser (2) drops, and so on. If the refrigerant absorbs heat well in (2) and the pressure of the refrigerant decreases, there is no problem even if the air volume of the condenser fan (12) is reduced.
0) reduces the supply of electric power to the condenser fan (12), and supplies the electric power to one or both of the freezer circulation fan (15) and the refrigerator circulation fan (62) according to the reduced electric power. Increase power.

Accordingly, one or both of the freezer (A) and the refrigerator (B) is quickly cooled.
In this way, the cooling performance of the freezer (A) and the refrigerator (B) can be further improved by effectively utilizing the power that can be supplied.

Further, since unnecessary operation of the condenser fan (12) can be suppressed, the durability of the condenser fan (12) can be improved.

The reference numerals in parentheses attached to the respective means indicate the correspondence with specific means described in the embodiments described later.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment) FIG. 1 is a schematic structural view of a truck equipped with a refrigerator-freezer 100 to which the present invention is applied. A is a freezer provided with an opening / closing door on the side of the vehicle body, B is a refrigerator provided with an opening / closing door on the rear or side of the vehicle body, and both have an integral structure sharing a partition wall C. The inside of the freezer A is cooled to, for example, −19 ° C., and the inside of the refrigerator B is cooled to, for example, 5 ° C., to a temperature suitable for freezing storage and cold storage.

As shown in FIG. 1, a condenser 2 for cooling the refrigerant by exchanging heat with the outside air is provided outside the freezer A on the left side (front side of the vehicle) in the figure. On the right side (rear side of the vehicle) in FIG. 2, an electric fan 12 as a condenser fan for forcibly sending air passing through the condenser 2 to the rear is provided.

An evaporator 5, which is a heat exchanger for generating cold air, is arranged in the upper part of the freezer A on the left side in the figure (front side of the vehicle). On the air suction side (left side in FIG. 1) of the evaporator 5, an electric fan 15, which is a freezer circulation fan that circulates the air in the freezer A, is disposed, and the evaporator 5 cools the freezer A. Sometimes it blows. A temperature sensor 16 which is a freezer temperature detecting means for detecting the temperature of the air sucked into the evaporator 5 is provided upstream of the electric fan 15 in the air flow. It outputs to the control device 300 mentioned later.

An air outlet 60 is opened above a partition E between the freezer A and the refrigerator B. An electric fan 62, which is a refrigerator circulation fan for sending out the air in the freezer A to the refrigerator B side, is provided in the blower opening 60. Further, a return port 61 for sending the air in the refrigerator B into the freezer A is opened at a lower portion of the partition wall C. And the electric fan 6
When the air conditioner 2 operates, a part of the cool air in the freezer A cooled by the evaporator 5 circulates in the refrigerator B from the blower port 60 and returns to the freezer A from the return port 61.

A temperature sensor 68 is provided on the refrigerator B side (right side in the figure) of the return port 61. The temperature sensor 68 is a controller for detecting the internal temperature of the refrigerator B. 300.

The refrigeration cycle 200 (a portion surrounded by a two-dot chain line in FIG. 1) is configured by connecting the respective functional members with a refrigerant pipe 10. When cooling the freezer A, the compressor 1 →
The refrigerant is circulated in the order of condenser 2 → receiver 3 → expansion valve (decompression means) 4 → evaporator 5 → accumulator 6 → compressor 1.

The compressor 1 is driven by a vehicle engine (not shown) via a V-belt (not shown) and a pulley (not shown). Transmission and cutoff of the driving force are performed by turning on and off the electromagnetic clutch 1a. ing.

Between the position of the refrigerant pipe 10 where the receiver 3 is provided and the position where the expansion valve 4 is provided, there is a refrigerant pressure detecting means for detecting the pressure of the refrigerant before the pressure is reduced by the expansion valve 4. A pressure sensor 7 is provided, and outputs pressure information of the refrigerant to a control device 300 described later.

Here, the refrigerant pipe 10 is constituted by a tube made of metal (copper alloy in this example). However, a part of the refrigerant pipe 10 near the discharge port and a part near the suction port of the compressor 1 is formed of a rubber hose reinforced with a reinforcing thread, and the vibration of the compressor 1 constitutes the refrigeration cycle 200. It is difficult to transmit to other functional members.

The refrigerator-freezer 100 has a control device 300 as control means including an electronic circuit. The control device 300 includes pressure information from the pressure sensor 7 and internal temperature from the temperature sensors 16 and 68. The information and information from a temperature setting switch (not shown) are input to the electromagnetic clutch 1a.
On and off, and within the range of power that can be supplied to each of the electric fans 12, 15, 62 during idling of a vehicle engine (not shown) that drives a generator (not shown),
Electric power is distributed to the electric fans 12, 15, 62, and the operation of the electric fans 12, 15, 62 is controlled.

Next, the refrigerator-freezer 100
The operation of will be described.

FIG. 2 is a flowchart showing a schematic control operation of the control device 300. When the engine of the vehicle is started and a cooling operation switch (not shown) is turned on, the refrigeration cycle 200 is operated, and the control device 300 first uses the pressure information from the pressure sensor 7 before the pressure is reduced by the expansion valve 4. It is determined whether the pressure of the refrigerant is 3 MPa or less (step S101).

When the pressure of the refrigerant is 3 MPa or less, the pressure of the refrigerant is set to 2 based on the pressure information from the pressure sensor 7.
It is determined whether the pressure is higher than MPa (step S10).
2). If the pressure of the refrigerant is higher than 2 MPa, then
Based on the information on the inside temperature from the temperature sensor 16 and the information from a temperature setting switch (not shown), it is determined whether or not the inside temperature Tf of the freezer A is −21 ° C. or higher (step S103).

If the temperature Tf in the freezer A is equal to or higher than -21.degree. C., the temperature of the refrigerator B is then determined based on the temperature information from the temperature sensor 68 and information from a temperature setting switch (not shown). It is determined whether the internal temperature Tc is equal to or higher than 4 ° C. (step S104). If the internal temperature Tc of the refrigerator B is equal to or higher than 4 ° C., step S105 is executed to set the operation mode M1.

That is, since the heat absorption from the refrigerant in the condenser 2 has not yet been sufficiently performed, the pressure of the refrigerant becomes 2
The operating mode M1 is set when the pressure in the freezer A and the refrigerator B need to be cooled while the pressure does not drop below the MPa.

The control device 300 outputs a signal when setting the operation mode M 1, turns on the electromagnetic clutch 1 a (while the ON state is continued when it is already on), and controls the power that can be supplied to the electric fan 12. 5
Each electric fan is operated by supplying 0% of electric power and supplying 20% of electric power that can be supplied to the electric fan 15 and supplying 30% of electric power that can be supplied to the electric fan 62.

Then, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 is satisfactorily condensed by the blow of the electric fan 12 supplied with 50% of the electric power that can be supplied by the condenser 2, and After gas-liquid separation, the pressure is reduced by the expansion valve 4 and evaporated in the evaporator 5 to cool the freezer A, it is sent to the accumulator 6, gas-liquid separated by the accumulator 6, and returns to the compressor 1.

At this time, a part of the cool air circulated in the freezer A by the electric fan 15 supplied with electric power of 20% of the electric power which can be cooled and supplied by the evaporator 5 becomes 30% of the electric power which can be supplied. The electric fan 62 is supplied with the electric power from the blower 60 to the refrigerator B through the air outlet 60, circulates through the refrigerator B and cools the refrigerator B, and then returns to the freezer A through the return opening 61.
Return inside. In this manner, the inside of the freezer A and the inside of the refrigerator B are cooled, but the inside of the freezer B is preferentially cooled.

At step S104, the internal temperature T of the refrigerator B
If c is less than 4 ° C., step S106 is executed to set the operation mode M2. That is, since the heat of the refrigerant in the condenser 2 is not yet sufficiently absorbed, the pressure of the refrigerant is not reduced to 2 MPa or less, and the freezer A needs to be cooled. When cooling is not necessary, the operation mode M2 is set.

The control device 300 outputs a signal when setting the operation mode M2, turns on the electromagnetic clutch 1a (continues the ON state when the electromagnetic clutch 1a is already ON), and controls the electric power that can be supplied to the electric fan 12. 5
0% power is supplied, 50% of the power that can be supplied to the electric fan 15 is supplied, the supply of power to the electric fan 62 is stopped, and the electric fans 12 and 15 are operated.
The electric fan 62 is stopped.

Then, similarly to the mode M1, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 is favorably blown by the electric fan 12 supplied with 50% of the power that can be supplied by the condenser 2. After being condensed, gas-liquid separation by the receiver 3, decompression by the expansion valve 4, evaporation by the evaporator 5, cooling of the freezer A, sending to the accumulator 6, gas-liquid separation by the accumulator 6, and compressor Return to 1.

At this time, the cool air cooled by the evaporator 5 is circulated into the freezer A by the electric fan 15 supplied with 50% of the power that can be supplied.
Is stopped, the cool air in the freezer A does not circulate in the refrigerator B. In this way, the cooling in the refrigerator B is stopped, and the electric power that has surplus due to the stop of the electric fan 62 is supplied to the electric fan 15 so that the freezer A
Cools the inside rapidly.

In step S103, the temperature T in the freezer A
If f is less than −21 ° C., then, based on information on the internal temperature from the temperature sensor 68 and information from a temperature setting switch (not shown), whether or not the internal temperature Tc of the refrigerator B is 4 ° C. or more A determination is made (step S107). If the internal temperature Tc of the refrigerator B is equal to or higher than 4 ° C., step S108 is executed to set the operation mode M3.

That is, since the heat absorption from the refrigerant in the condenser 2 is not yet sufficiently performed, the pressure of the refrigerant becomes 2
The operating mode M3 is set when the inside of the refrigerator A does not need to be cooled while the inside of the refrigerator A does not need to be cooled while the inside of the refrigerator B does not need to be cooled.

Control device 300 outputs a signal when operating mode M3 is set, and turns off electromagnetic clutch 1a (when the clutch is already in the off state, the off state is continued), and electric fan 12 and electric fan 15 are turned off.
The power supply to the electric fan 62 is stopped, and 100% of the power that can be supplied to the electric fan 62 is supplied to stop the electric fans 12 and 15 and to operate the electric fan 62.

Then, since the compressor 1 is not driven, the refrigerant does not circulate and no further cooling of the freezer A is performed.
At this time, a part of the cool air in the freezer A is sent from the blower port 60 into the refrigerator B by the electric fan 62 and circulates in the refrigerator B to cool the refrigerator B.
Return to the freezer A from 1. In this way, the cooling in the freezer A is stopped, and the electric power that can be supplied is concentrated on the electric fan 62 to quickly cool the refrigerator B.

In step S107, the internal temperature T of the refrigerator B
If c is less than 4 ° C., step S109 is executed to set the operation mode M4. In other words, when the heat of the refrigerant in the condenser 2 is not yet sufficiently absorbed, the pressure of the refrigerant has not decreased to 2 MPa or less, and when it is not necessary to cool the freezer A and the refrigerator B, Set the operation mode M4.

Control device 300 outputs a signal when operating mode M4 is set, turns off electromagnetic clutch 1a (while it is already in the off state, continues the off state), and controls electric fan 12, electric fan 15, and electric motor The supply of power to the fan 62 is stopped, and each electric fan is stopped. That is, all are stopped.

Then, since the compressor 1 is not driven, the refrigerant does not circulate, and the freezer A is not further cooled. Since the electric fan 62 is also stopped, the cool air in the freezer A does not circulate in the refrigerator B. In this way, the cooling in the freezer A and the refrigerator B is stopped.

In step S102, when the pressure of the refrigerant is 2 MPa or less, the temperature Tf of the freezer A is then determined based on the temperature information from the temperature sensor 16 and the information from a temperature setting switch (not shown). Is higher than or equal to −21 ° C. (step S110).

If the internal temperature Tf of the freezer A is equal to or higher than −21 ° C., the internal temperature of the refrigerator B is then determined based on the internal temperature information from the temperature sensor 68 and the information from a temperature setting switch (not shown). It is determined whether the internal temperature Tc is equal to or higher than 4 ° C. (step S111). When the internal temperature Tc of the refrigerator B is 4 ° C. or more, the control device 30
It is determined by a refrigerator sensor timer (not shown) that is a refrigerator circulation fan operating state detecting means provided in 0 whether or not the time t after the stop of the electric fan 62 that is the refrigerator circulation fan is 30 minutes or more (step S112).

If the time t after the stoppage of the electric fan 62 is 30 minutes or more, step S113 is executed to set the operation mode M5. That is, when the refrigerant pressure is reduced to 2 MPa or less due to good heat absorption from the refrigerant in the condenser 2 and the like, it is necessary to cool the freezer A and the refrigerator B. , Refrigerator B
If the cooling has not been performed for 30 minutes or more, the operation mode M5 is set.

The control device 300 outputs a signal when setting the operation mode M5, turns on the electromagnetic clutch 1a (while the ON state is continued when the electromagnetic clutch 1a is already ON), and controls the power that can be supplied to the electric fan 12. 3
Each of the electric fans is operated by supplying 0% of the electric power, supplying 20% of the electric power that can be supplied to the electric fan 15, and supplying 50% of the electric power that can be supplied to the electric fan 62.

Then, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 is blown by the electric fan 12 in the condenser 2 to which 30% of the power that can be supplied is smaller than in the operation mode M1. After being condensed better, the gas and liquid are separated by the receiver 3, the pressure is reduced by the expansion valve 4, the vapor is evaporated by the evaporator 5, and the inside of the freezer A is cooled, and then sent to the accumulator 6 and separated by the accumulator 6 Return to the compressor 1.

At this time, a part of the cool air circulated into the freezer A by the electric fan 15 supplied with electric power of 20% of the electric power which can be cooled and supplied by the evaporator 5 becomes 50% of the electric power which can be supplied. The electric fan 62 is supplied with the electric power from the blower 60 to the refrigerator B through the air outlet 60, circulates through the refrigerator B and cools the refrigerator B, and then returns to the freezer A through the return opening 61.
Return inside. In this way, the inside of the freezer A and the inside of the refrigerator B are cooled, but the electric fan 1 is more cooled than in the operation mode M1.
The electric fan 6 according to the reduced power supplied to the electric fan 6
The power to be supplied to the refrigerator 2 is increased and the inside of the refrigerator B is preferentially cooled rapidly.

In step S112, the electric fan 62
If the after-stop time t is less than 30 minutes, step S114 is executed to set the operation mode M6. That is, when the refrigerant pressure is reduced to 2 MPa or less due to good heat absorption from the refrigerant in the condenser 2 and the like, it is necessary to cool the freezer A and the refrigerator B. If the time during which the refrigerator B has not been cooled is less than 30 minutes, the operation mode M6 is set.

That is, if it is necessary to cool the refrigerator B, but the refrigerator B has not been cooled for a short time of less than 30 minutes, it is easy to cool the refrigerator B. And the operation mode M6 is set.

Control device 300 outputs a signal when operating mode M6 is set, turns on electromagnetic clutch 1a (while already being on, continues the on state), and controls the amount of power that can be supplied to electric fan 12. 3
Each electric fan is operated by supplying 0% of electric power, supplying 50% of electric power that can be supplied to the electric fan 15 and supplying 20% of electric power that can be supplied to the electric fan 62.

Then, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 is supplied to the condenser 2 by the electric fan 12 supplied with 30% of the electric power which can be supplied, which is smaller than that in the operation mode M1. After being condensed better, the gas and liquid are separated by the receiver 3, the pressure is reduced by the expansion valve 4, the vapor is evaporated by the evaporator 5, and the inside of the freezer A is cooled, and then sent to the accumulator 6 and separated by the accumulator 6 Return to the compressor 1.

At this time, a part of the cool air circulated in the freezer A by the electric fan 15 supplied with electric power of 50% of the electric power which can be cooled and supplied by the evaporator 5 becomes 20% of the electric power which can be supplied. The electric fan 62 is supplied with the electric power from the blower 60 to the refrigerator B through the air outlet 60, circulates through the refrigerator B and cools the refrigerator B, and then returns to the freezer A through the return opening 61.
Return inside. In this way, the inside of the freezer A and the inside of the refrigerator B are cooled, but the electric fan 1 is more cooled than in the operation mode M1.
Fan 15 according to the reduced power supply to the electric fan 15
, And the inside of the freezer A is rapidly cooled with priority.

At step S111, the internal temperature T of the refrigerator B
If c is less than 4 ° C., step S115 is executed to set the operation mode M7. That is, the pressure of the refrigerant is reduced to 2 MPa or less, and the inside of the freezer A needs to be cooled, because the heat absorption from the refrigerant in the condenser 2 is performed well. When cooling is not necessary, the operation mode M7 is set.

The control device 300 outputs a signal when setting the operation mode M7, turns on the electromagnetic clutch 1a (while the ON state is continued when it is already ON), and controls the power that can be supplied to the electric fan 12. 3
0% power is supplied, 70% of the power that can be supplied to the electric fan 15 is supplied, the supply of power to the electric fan 62 is stopped, and the electric fans 12 and 15 are operated.
The electric fan 62 is stopped.

Then, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 is blown by the electric fan 12 supplied with 30% of the power that can be supplied by the condenser 2 as in the modes M5 and M6. After being condensed well, gas-liquid separation is performed by the receiver 3, the pressure is reduced by the expansion valve 4, evaporated in the evaporator 5, and cooled in the freezer A, sent to the accumulator 6, and separated in the accumulator 6. Return to the compressor 1.

At this time, the cool air cooled by the evaporator 5 is circulated into the freezer A by the electric fan 15 supplied with 70% of the suppliable electric power.
Is stopped, the cool air in the freezer A does not circulate in the refrigerator B. In this way, the cooling in the refrigerator B is stopped, and the electric power that has surplus due to the stop of the electric fan 62 is supplied to the electric fan 15 so that the freezer A
Cools the inside rapidly.

At step S110, the temperature T in the freezer A
If f is less than −21 ° C., then, based on information on the internal temperature from the temperature sensor 68 and information from a temperature setting switch (not shown), whether or not the internal temperature Tc of the refrigerator B is 4 ° C. or more A determination is made (step S116). If the internal temperature Tc of the refrigerator B is equal to or higher than 4 ° C., step S108 is executed to set the operation mode M3. Therefore,
The cooling in the freezer A is stopped, and the power that can be supplied is concentrated on the electric fan 62 to rapidly cool the refrigerator B.

In step S116, the temperature T in the refrigerator B
If c is less than 4 ° C., step S109 is executed to set the operation mode M4. That is, it is not necessary to cool the inside of the freezer A and the refrigerator B even when the pressure of the refrigerant is reduced to 2 MPa or less because the heat absorption from the refrigerant in the condenser 2 is performed well. Sometimes
Set the operation mode M4. Therefore, the cooling in the freezer A and the refrigerator B is stopped.

If the pressure of the refrigerant is higher than 3 MPa in step S101, it is determined that the high pressure is abnormal, and the operation mode M4 is set. Therefore, all of them are stopped and cooling in the freezer A and the refrigerator B is stopped.

As described above, the control device 300 executes steps S105, S106, S108, S109, S113,
When any one of the operation modes M1 to M7 is set in any one of S114 and S115,
Next, it is determined whether or not 10 seconds have elapsed after setting one of the operation modes (step S117). And
When 10 seconds have elapsed, the process returns to step S101.

The reason why the standby time of 10 seconds is set in step S117 is to prevent the hunting operation of the electromagnetic clutch 1a and to set the electric fans 12, 15, and 62.
This is to prevent the occurrence of noise or the like due to frequent repetition of operation or stoppage in a short time, or change in the amount of air blow.

According to the above flow, when it is necessary to cool the freezer A and the refrigerator B does not need to be cooled, the control device 300 stops the electric fan 62 and The surplus power is supplied to the electric fan 15. Therefore, the inside of the freezer A is quickly cooled. In this manner, the cooling performance of the freezer A can be further improved by effectively utilizing the power that can be supplied.

In particular, when it is not necessary to cool the refrigerator B when frost is formed on the evaporator 5, the cooling performance in the freezer A can be secured by increasing the air volume of the electric fan 15, The effect is great.

When it is necessary to cool at least the inside of the freezer A, the heat of the refrigerant in the condenser 2 is favorably absorbed due to a decrease in the outside air temperature outside the condenser 2 and the pressure of the refrigerant is 2 MPa. When it falls below, the electric fan 12
Since there is no problem even if the air volume is reduced, the control device 30
A value of 0 decreases the supply of electric power to the electric fan 12, and increases the electric power supplied to either the electric fan 15 or the electric fan 62 according to the reduced electric power.

Therefore, either the inside of the freezer A or the inside of the refrigerator B is quickly cooled. In this way, the cooling performance of the freezer A and the refrigerator B can be further improved by effectively using the power that can be supplied. In addition, since unnecessary operation of the electric fan 12 can be suppressed,
Can be improved in durability.

Next, an example of operation of the refrigerator 100 based on the above-described configuration and operation will be described.

FIG. 3 is a diagram showing an operation mode and a change in the internal temperature of the freezer A and the refrigerator B in an operation example of the refrigerator 100. Graph a shows the internal temperature Tf of the freezer A.
And the graph b shows the internal temperature Tc of the refrigerator B.

First, when both the inside of the freezer A and the inside of the refrigerator B are not cooled and the temperature is almost equal to the outside air temperature and the engine is started and the cooling switch is turned on, the freezer / refrigerator 100 starts operating. Immediately after starting, condenser 2
, The pressure of the refrigerant is slightly higher than 2 MPa. The temperature Tf of the freezer A is also the temperature Tc of the refrigerator B.
Is not reduced, the operation mode M1 is set, and the inside of the freezer A and the inside of the refrigerator B are cooled, but the inside of the refrigerator B is cooled with priority.

When the heat absorption from the refrigerant in the condenser 2 is satisfactorily performed due to the influence of the wind flowing in the vehicle, or when the refrigerant pressure becomes 2 MPa or less due to a decrease in the temperature of the freezer A, the setting mode is changed to the operation mode M5. Then, the power supplied to the electric fan 62 is increased in accordance with the decrease in the power supplied to the electric fan 12. Therefore, as shown by b1 in FIG. 3, the inside of the refrigerator B is cooled rapidly with priority. Note that the operation modes M1 and M5 are set so far when the time t after the stoppage of the electric fan 62 is 30 minutes or more.

When the internal temperature Tc of the refrigerator B becomes lower than -4 ° C., the setting is changed to the operation mode M7 and the electric fan 62
The power supply to the electric fan 15 is stopped, the supply to the electric fan 62 is stopped, and the electric power supplied to the electric fan 15 is increased according to the electric power corresponding to the surplus power. Therefore, the cooling in the refrigerator B is stopped, and the inside of the freezer A is rapidly cooled as shown in a1 part in FIG.

When the internal temperature Tc of the refrigerator B rises to 4 ° C. or more because the cooling in the refrigerator B is stopped, the setting is changed to the operation mode M6. This is because when the operation mode M5 ends, the electric fan 62 stops and the electric fan 6 stops.
2. This is because the time t after the stop is less than 30 minutes. At this time, the inside of the freezer A and the inside of the refrigerator B are cooled, but the power supplied to the electric fan 15 is increased in accordance with the reduced power supplied to the electric fan 12 as compared with the operation mode M1. Therefore, the inside of the freezer A is rapidly cooled with priority.

As described above, the freezer A and the refrigerator B are cooled, and when the temperature Tf of the freezer A is lower than −21 ° C. and the temperature Tc of the refrigerator B is lower than 4 ° C., the setting is changed to the operation mode M4. Is done. Therefore, the refrigeration cycle 200 is stopped, and the supply of electric power to the electric fan 12, the electric fan 15, and the electric fan 62 is stopped, and each electric fan is stopped. That is, all are stopped.

When all of the refrigerators are stopped, the temperature in both refrigerators rises, and when the refrigerator internal temperature Tf becomes −21 ° C. or more and the refrigerator B internal temperature Tc becomes 4 ° C. or more, the operation mode M6 is started. Is changed to This is the operation mode M
This is because the electric fan 62 stops when the operation is completed, and the time t after the stop of the electric fan 62 is less than 30 minutes. At this time, the inside of the freezer A and the inside of the refrigerator B are cooled, but the electric power supplied to the electric fan 15 is increased in accordance with the reduced electric power to the electric fan 12 as compared with the operation mode M1. Therefore, the inside of the freezer A is rapidly cooled with priority.

Thus, freezer A and refrigerator B
And the temperature Tf in the freezer A becomes lower than −21 ° C., but the temperature Tc in the refrigerator B is 4 ° C. or more,
The setting is changed to the operation mode M3. Accordingly, the refrigeration cycle 200 is stopped, the power supply to the electric fans 12 and 15 is stopped, and the power that can be supplied is reduced to the electric fan 62.
To supply. In this way, the cooling in the freezer A is stopped, and the electric power that can be supplied is concentrated on the electric fan 62 to quickly cool the refrigerator B.

When the operation mode M3 is set, the internal temperature Tc of the refrigerator B decreases and becomes lower than 4 ° C., and the internal temperature Tf of the freezer A increases and becomes −21 ° C. or higher.
The setting is changed to 7. The supply of electric power to the electric fan 62 is stopped, and the supply of electric power to the electric fan 62 is stopped. Therefore,
The cooling in the refrigerator B is stopped, and the inside of the freezer A is rapidly cooled.

When the control device 300 controls the electromagnetic clutch 1a and the electric fans 12, 15, and 62 in accordance with the above-described flow as in the above-described operation example, the temperature Tc of the refrigerator B can be quickly increased by 4 at the time of cooling down. ° C, and then the internal temperature Tf of the freezer A can quickly reach -21 ° C, and the cool-down time of both the refrigerators A and B can be shortened. Further, in order to maintain the inside temperature even after the completion of the cool down, the electric power that can be supplied is supplied to each electric fan 1.
2, 15, and 62 can be appropriately distributed, and the internal temperature can be reliably maintained.

In this embodiment, 2 MPa, 3 M
Real values such as Pa, 4 ° C., and −21 ° C. are mere examples, and can be appropriately set according to characteristics such as the capacity of the refrigerator and the refrigerating capacity of the refrigerating cycle and the temperature set value by the user.

(Other Embodiments) In the above-described embodiment, the stepped control for fixing the distribution ratio of the suppliable electric power to the electric fans 12, 15, and 62 is performed. However, as shown in FIG. The control device 300 controls each of the electric fans 12, 15, 62
Transistors 12 that control the power supplied to the
a, 15a, and 62a, and each transistor 12a, 1
5a and 62a, a signal is input to the base of each electric fan 1
The power supplied to 2, 15, and 62 may be steplessly controlled.

In the above embodiment, step S1
By setting the standby time at 17, the electromagnetic clutch 1
Although the hunting operation and the like of a are prevented, the hunting operation and the like of the electromagnetic clutch 1a may be prevented by setting the switching temperature condition between the modes to be different between when the temperature is increased and when the temperature is decreased. For example, when the refrigerant pressure is 3 MPa or less and greater than 2 MPa,
When the internal temperature Tf of the freezer A is −21 ° C. or more, FIG.
As shown in (2), the temperature condition of the mode switching may be such that there is a difference of 2 ° C. between when the temperature inside the refrigerator Tc of the refrigerator B rises and when it falls.

In the above embodiment, when it is necessary to cool at least the freezer A, the pressure of the refrigerant is reduced to 2
When the pressure drops below MPa, the control device 300 reduces the supply of power to the electric fan 12, and increases the power supplied to one of the electric fan 15 and the electric fan 62 according to the reduced power. However, the control device 300 reduces the supply of electric power to the electric fan 12,
The power supplied to both the electric fan 15 and the electric fan 62 may be increased in accordance with the reduced power.

In the above embodiment, the refrigerator-freezer 1
Although 00 is mounted on the vehicle, it is needless to say that it can be applied to a vehicle other than the vehicle.

[Brief description of the drawings]

FIG. 1 is a refrigerator 100 according to an embodiment of the present invention.
1 is a schematic configuration diagram of a truck equipped with a.

FIG. 2 is a flowchart illustrating a schematic control operation of a control device 300 according to an embodiment of the present invention.

FIG. 3 is a refrigerator 100 according to an embodiment of the present invention.
It is explanatory drawing of the example of operation | movement of.

FIG. 4 shows each electric fan 1 according to another embodiment of the present invention.
It is explanatory drawing which shows the structure which carries out stepless control of the electric power supplied to 2,15,62.

FIG. 5 is an explanatory diagram showing temperature conditions for mode switching in another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 1a Electromagnetic clutch 2 Condenser 4 Expansion valve (pressure reduction means) 5 Evaporator 7 Pressure sensor (refrigerant pressure detection means) 10 Refrigerant piping 12 Electric fan (condenser fan) 15 Electric fan (freezer circulation fan) 16 Temperature sensor (Freezer temperature detecting means) 62 Electric fan (Refrigerator circulation fan) 68 Temperature sensor (Refrigerator temperature detecting means) 100 Refrigerator 200 Refrigeration cycle 300 Control device (Control means) A Freezer B Refrigerator

Claims (3)

[Claims] 1. A freezer (A) and a refrigerator (B) provided adjacent to the freezer (A)
A compressor (1) that compresses a refrigerant; and a condenser (2) that is provided outside the freezer (A) and the refrigerator (B) and that exchanges heat between the refrigerant and air to cool the refrigerant. A condenser fan (12) for blowing the air to the condenser (2); a decompression means (4) for decompressing the refrigerant; and a heat exchange between the refrigerant and air in the freezer (A). hand,
Evaporator (5) for cooling the air in the freezer (A)
A freezer circulation fan (15) for blowing the air in the freezer (A) to the evaporator (5); and circulating the cooled air in the freezer (A) into the refrigerator (B). Refrigerator circulation fan to supply (6
2), wherein the compressor (1), the condenser (2), the decompression means (4), and the evaporator (5) are connected in order in a ring by a refrigerant pipe (10). When the temperature inside the freezer (A) is equal to or higher than a predetermined value, the supply of power to the refrigerator circulation fan (62) is stopped when the temperature inside the refrigerator (B) becomes lower than a predetermined value. And a control means (300) for controlling so as to increase the electric power supplied to the freezer circulation fan (15) in accordance with the electric power for stopping the supply to the refrigeration circulation fan (62). A refrigerator-freezer characterized by that: 2. The control means (300), when the temperature in the freezer (A) is equal to or higher than a predetermined value, after being compressed by the compressor (1), the control means (300) controls the decompression means (4). If the pressure of the refrigerant before the pressure is reduced to a predetermined value or less, the supply of power to the condenser fan (12) is reduced, and the supply to the condenser fan (12) is reduced. According to the electric power, the freezer circulation fan (15)
2. The refrigerator according to claim 1, wherein electric power supplied to at least one of the refrigerator circulation fans is controlled to be increased. 3. 3. A freezer (A) and a refrigerator (B) provided adjacent to the freezer (A).
A compressor (1) that compresses a refrigerant; and a condenser (2) that is provided outside the freezer (A) and the refrigerator (B) and that exchanges heat between the refrigerant and air to cool the refrigerant. A condenser fan (12) for blowing the air to the condenser (2); a decompression means (4) for decompressing the refrigerant; and a heat exchange between the refrigerant and air in the freezer (A). hand,
Evaporator (5) for cooling the air in the freezer (A)
A freezer circulation fan (15) for blowing the air in the freezer (A) to the evaporator (5); and circulating the cooled air in the freezer (A) into the refrigerator (B). Refrigerator circulation fan to supply (6
2), wherein the compressor (1), the condenser (2), the decompression means (4), and the evaporator (5) are connected in order in a ring to a refrigerant pipe. When the internal temperature of A) is equal to or higher than a predetermined value, the pressure of the refrigerant after being compressed by the compressor (1) and before being depressurized by the pressure reducing means (4) becomes equal to or lower than a predetermined value. Then, the supply of electric power to the condenser fan (12) is reduced, and the freezer circulation fan (15) or the refrigerator is supplied in accordance with the reduced electric power supplied to the condenser fan (12). A refrigerator comprising a control means (300) for controlling so as to increase electric power supplied to at least one of the circulation fans (62).