JP2000283621A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a refrigerant from becoming insufficient liquid from returning in a refrigerator using a lateral revolution high pressure container type compressor sing a hydrocarbon refrigerant such as isobutane. SOLUTION: A refrigerator is adapted such that it has a freezing cycle in which there in formed into a series closed circuit of a high pressure container type compressor 1, a condenser 2, pressure reduction means 3, and an evaporator 4. In the refrigerator, there is provided heating means 7 for heating refrigerating machine oil encapsulated in a high pressure container of the compressor, and the refrigerating machine oil is heated with the heating means until compressor temperature rises to a temperature where a refrigerant amount is not insufficient after power supply to the refrigerator, and then the compressor 1 is started. Further, there is provided heating means for heating refrigerating machine oil wherein when detected fresh air temperature is lowered to a temperature near a temperature where the detected fresh air temperature causes lack of the refrigerant amount after interruption of a compressor subjected to intermittent operation, a cooling fan 5 for the compressor is interrupted or revolutions of the cooling fan are reduced, and then the compressor is started after the refrigerating machine oil is heated until the compressor temperature rises to the temperature where no lack of a refrigerant amount is caused.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator in which a hydrocarbon-based refrigerant such as isobutane is sealed and a high-pressure container-type compressor is used.

[0002]

2. Description of the Related Art As a conventional refrigerator, there is one disclosed in Japanese Patent Application Laid-Open No. Hei 10-292971 shown in FIG.
The refrigerator has about 180 g of HFC13 as a working refrigerant.
Using 4a ((1,2,2,2-tetrafluoroethane)), an ester oil having low compatibility with the refrigerant is sealed in a low-pressure container type reciprocating compressor as a refrigerating machine oil.

[0003] The internal temperature control is performed by a low-pressure container type compressor (low-pressure refrigerant from an evaporator is once stored in a compressor container in which refrigerating machine oil is sealed, and then put into a compression unit (for example, a cylinder) and compressed. And operation in which the high-pressure refrigerant is discharged from the compressor directly out of the compressor)
Although this is performed by stopping the compressor, when the compressor is stopped, the high-temperature and high-pressure refrigerant in the condenser flows into the evaporator via the pipe. Further, when the compressor is restarted, a part of the refrigerant remaining in a liquid state in the low-temperature evaporator flows into the compressor via the compressor suction pipe without being vaporized.

[0004] In the compressor, the refrigerant first flows into the low-pressure vessel, and if liquid refrigerant remains, it is vaporized in the low-pressure vessel and then sucked into the compression section. Phenomenon such as spill of refrigerating machine oil is prevented.

[0005] When the refrigerator is operated after a long-term shutdown, the temperature of the compressor drops to the ambient room temperature where the compressor is installed, so that the amount of refrigerant dissolved in the refrigerating machine oil in the compressor increases as compared with the normal operation. (The lower the temperature and the higher the pressure, the greater the amount of refrigerant dissolved in the refrigerating machine oil). For this reason, the refrigerant amount of the refrigeration cycle becomes short immediately after startup,
That the compatibility between the refrigerant HFC134a and the refrigerating machine ester oil is small, and that the amount of the charged refrigerant is as large as about 180 g;
Furthermore, since the compressor is a low-pressure container type compressor, the pressure in the low-pressure container chamber containing the refrigerating machine oil decreases after startup, so that the refrigerant that has been dissolved is discharged to the refrigeration cycle. The shortage is resolved within a short time, and the refrigerator can be cooled quickly.

[0006] Here again, the phenomenon regarding the solubility of the refrigerant in the refrigerating machine oil will be described. Low-pressure container type compressor (the refrigerant from the evaporator is once stored in a compressor container in which refrigerating machine oil is sealed, then put into a compression unit (for example, a cylinder) and compressed, and directly from the compression unit of the compressor. In the case where the compressor is stopped for a long period of time, the pressure in the cycle is uniform, and As the pressure in the low-pressure chamber increases, the temperature of the compressor and the refrigerating machine oil in the compressor decreases to room temperature, so that the refrigerant solubility in the refrigerating machine oil increases. When the compressor is started, while the temperature remains almost constant, the pressure in the low-pressure container in which the refrigerating machine oil is sealed decreases, so that the solubility of the refrigerant decreases. For this reason, since the refrigerant dissolved in the refrigerating machine oil is discharged to the refrigeration cycle, the amount of refrigerant in the refrigeration cycle does not run short.

[0007] A high-pressure container type compressor (the refrigerant from the evaporator is directly introduced into a compression section (for example, a cylinder) of the compressor container in which the refrigerating machine oil is filled, and the refrigerant compressed by the cylinder is placed in the high-pressure container. This is the type of refrigerant that is discharged and the refrigerant is supplied to the condenser from the outlet of the high-pressure vessel.) In the state where the compressor is stopped for a long time, the pressure in the cycle is uniform. In this state, the pressure in the high-pressure chamber is lower than during operation, but the temperature of the compressor and the refrigerating machine oil in the compressor drops to room temperature, so that the refrigerant solubility in the refrigerating machine oil increases. When the compressor is started, the pressure in the high-pressure container in which the refrigerating machine oil is sealed increases while the temperature remains almost constant, so that the solubility of the refrigerant in the refrigerating machine oil increases. Accordingly, even the refrigerant in the refrigeration cycle is dissolved in the refrigerating machine oil by the start, and the shortage of the refrigerant in the refrigeration cycle occurs. After that, the temperature of the refrigerating machine oil rises with the compressor temperature due to the heat generated by energizing the compressor, and the dissolved refrigerant is gradually released to the refrigerating cycle, and finally the compressor temperature rises to a steady state temperature At that time, much of the refrigerant initially dissolved in the refrigerating machine oil is released during the cycle, and the inside of the refrigerator can be sufficiently cooled. Since the heat capacity of the compressor is large, it takes a long time to raise the temperature of the refrigerating machine oil. During this time, the refrigerating cycle runs short of the refrigerant, so that the refrigerator cannot be sufficiently cooled.

[0008]

The refrigerant HFC134a currently used has no ozone depleting ability, but has a global warming effect of about 1,300 times as high as the carbon dioxide ratio. In recent years, there has been a social demand for an alternative to hydrocarbon refrigerants such as isobutane and propane, which have a small global warming effect.

As a refrigerant for refrigerators, isobutane having high refrigeration cycle efficiency is considered to be promising because of its thermophysical properties. However, when isobutane is used, the compressor stroke volume is increased due to the difference in physical properties (the specific volume of isobutane is increased). Refrigerator oil was changed to mineral oil with high compatibility (because it is large) (isobutane is incompatible with conventional ester oil and causes problems in lubrication, so compatibility is high, but mineral oil is used.) Reduction (about 50 g) (since isobutane has a large specific volume),
Such a change is required.

When the reciprocating compressor is used to increase the compressor stroke volume, the size of the entire compressor is accordingly increased, so that the space in the machine room for accommodating the compressor is increased,
Accordingly, the storage capacity of the food storage room must be reduced. In order to increase the compressor stroke volume without reducing the storage capacity of the food storage room, change to a horizontal type rotary compressor with good storage efficiency in the machine room and high efficiency as a compressor It is promising to respond to

However, because of the structure of the conventionally used rotary compressor, the structure of the high-pressure container type compressor (the refrigerant sucked from the evaporator is directly introduced into the cylinder of the compression section, and compressed by the cylinder. Is discharged into the high-pressure container in which the refrigerant is discharged and the refrigerant is supplied from the outlet of the high-pressure container to the condenser). On the other hand, although the amount is as small as about 50 g, the compatibility between the refrigerant isobutane and the mineral oil as the refrigerating machine oil is large, so that the effect of the shortage of the refrigerant amount in the refrigerating cycle immediately after the start due to the dissolution of the refrigerant in the refrigerating machine oil increases.

Further, since the compressor is a high-pressure container type compressor, the pressure in the high-pressure container chamber in which the refrigerating machine oil is filled rises upon start-up, so that the structure is such that the dissolved refrigerant is not easily discharged to the refrigeration cycle. Since it is necessary to wait for the refrigerant to be released from the refrigerating machine oil due to the temperature rise due to heat generation, there is a problem that the refrigerant shortage of the refrigeration cycle continues for a long time and the cooling in the refrigerator takes time.

[0013] Further, when the ambient temperature decreases in winter, even when the compressor in the intermittent operation is stopped, the compressor temperature may decrease and the refrigerant in the refrigeration cycle may similarly run short due to an increase in the amount of refrigerant dissolved in the refrigeration oil. There is a problem that there is.

Furthermore, unlike the low-pressure container type compressor, the high-pressure container type compressor has a configuration in which the suction pipe from the evaporator is directly connected to a compression section (for example, a cylinder) in the compressor. Therefore, there is a problem that a mechanism for preventing the liquid from returning to the compressor at the time of start-up is required to avoid liquid compression.

[0015] When a horizontal compressor is housed in the refrigerator machine room, if the compressor piping is connected in the axial direction of the compressor rotating shaft, brazing of the compressor piping may be performed. There is a problem that the work space is difficult.

[0016]

In order to solve the above problems, the present invention mainly employs the following configuration.

A refrigerator having a refrigerating cycle in which a high-pressure vessel type compressor, a condenser, a decompression means, and an evaporator are formed in a series closed circuit, wherein refrigerating machine oil sealed in a high-pressure vessel of the compressor is provided. Providing heating means for heating, after energizing the refrigerator, after heating the refrigerating machine oil by the heating means until the compressor temperature rises to a temperature that does not cause shortage of the refrigerant amount,
A refrigerator that starts the compressor.

Also, a refrigeration cycle in which a high-pressure container type compressor, a condenser, a pressure reducing means, and an evaporator are formed in a series closed circuit, a fan for blowing the evaporator, and an outside air temperature detection for detecting an outside air temperature And a heating means for heating refrigerating machine oil sealed in a high-pressure container of the compressor, wherein after the compressor that performs the intermittent operation is stopped, the detected outside air temperature is a refrigerant. When the temperature has decreased to a temperature near the shortage of the amount, the cooling fan of the compressor is stopped or the rotation speed of the cooling fan is reduced,
A refrigerator that starts the compressor after heating the refrigerating machine oil until the compressor temperature rises to a temperature that does not cause a shortage of the refrigerant amount.

Further, a high-pressure vessel type compressor, a condenser, a first decompression means, a first evaporator, a second evacuation means and a second evaporator provided in parallel with the flow path of the first evaporator are provided. A refrigeration cycle having a pressure reducing means and a second evaporator, a means for switching a flow path to the first evaporator and the second evaporator, a cooling fan for the compressor, the first and second A fan for blowing air of the evaporator, and at least two chambers having different temperatures corresponding to the first and second evaporators, the refrigerator comprising: A refrigerator that restarts the compressor in accordance with temperature control in the refrigerator while closing a flow path on a low-temperature side of the evaporator in the first and second evaporators.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
This will be described with reference to the drawings. FIG. 1 is a diagram illustrating a refrigeration cycle of a refrigerator according to an embodiment of the present invention, and FIG. 8 is a diagram illustrating a flowchart when the refrigerator according to the embodiment of the present invention is started. In FIG. 1, 1 is a compressor, 2 is a condenser,
3 is a decompression means, 4 is an evaporator, 5 is a cooling fan for the condenser 2 and the compressor 1, 6 is a blower fan for the evaporator 4, 7 is a means for heating refrigerating machine oil in the compressor 1, and 8 is Compressor temperature detecting means, 9 indicates outside air temperature detecting means, and 10 indicates control means.

In S2 of FIG. 8, t_standby is a time period t_set to wait until the compressor 1 is started after the outlet is turned on and the refrigerator is energized. Is a count time of a timer for measuring the standby time of the timer. In S4,
T_low is the lower limit of the refrigerating machine oil temperature at which the refrigerant shortage does not occur.

A hydrocarbon-based refrigerant such as isobutane is used as the refrigerant, and a mineral oil compatible with the refrigerating machine oil is used. FIG. 8 shows the operation of the control means 10 of the present invention when the refrigerator is operated from a state in which the operation has not been performed for a long time such as immediately after purchase.
It will be described based on. The temperature of the compressor 1 and the refrigerating machine oil in the compressor 1 decreases to the ambient room temperature, the amount of refrigerant dissolved in the refrigerating machine oil increases, and the refrigeration cycle tends to be short of refrigerant. Here, the compatibility of the refrigerant with the refrigerating machine oil increases as the temperature decreases and as the pressure increases.

After power is supplied to the refrigerator in S1, the compressor start standby timer in the control means 10 starts counting in S2.
The compressor 1 does not start immediately after energization in order to prevent the compressor starting failure when the outlet is plugged in and out at short intervals. In S3, the compressor temperature T_comp is detected, and in S4, it is determined whether or not the temperature T_comp has decreased until a refrigerant shortage occurs. T_low is obtained in advance by an experiment or the like. When it is determined that the compressor temperature is high and the refrigerant amount is not insufficient, the process jumps to S9, and after the startup standby time t_set has elapsed, starts the compressor in S10.

If it is determined in S4 that the compressor temperature is low and the refrigerant amount is insufficient, the flow proceeds to S5 where the refrigerating machine oil is heated by the refrigerating machine oil heating means 7 and the refrigerant dissolved in the refrigerating machine oil is discharged during the refrigerating cycle. discharge. As the refrigerating machine oil heating means 7, a heater may be installed in the refrigerating machine oil in the compressor 1, for example, or heating may be performed by energizing a motor coil of the compressor 1.

In S6, the compressor temperature is detected at predetermined time intervals, and in S7, the refrigerating machine oil is heated until the temperature exceeds a predetermined temperature T_low at which refrigerant shortage does not occur. After the refrigerating machine oil temperature rises, the heating is stopped in S8, the compressor is started in S10 after the compressor startup standby time t_set has been reached in S9, and the refrigeration cycle is operated.

The refrigerator constructed as in the present invention is equipped with a high-pressure container type compressor for starting the compressor after the refrigerant dissolved in the refrigerating machine oil is discharged to the refrigerating cycle in advance, and is operated for a long time. Even if the refrigerator is not in operation, the refrigerator can be cooled in a short time without causing an excessive shortage of refrigerant in the refrigeration cycle at the time of startup. Also, since the heating of the refrigerating machine oil is performed using the compressor start standby time,
No special time is required for the heating.

As can be seen from the control flow up to the start of the compressor in the prior art shown in FIG. 10, after the power is supplied to the refrigerator (S19), the set time is set by the timer so as to satisfy various requirements before the start of the compressor. It is set and waiting for activation. In the embodiment of the present invention, as shown in FIG. 8, the refrigerating machine oil is to be heated within the standby time shown in FIG.

Further, even if the control as shown in FIG. 9 is performed, the same effect as the above embodiment can be obtained. The control will be described below with reference to the flowchart of FIG.

After power supply to the refrigerator is started in S11, S
At 12, the activation standby timer starts counting. Then S
At 13, heating of the refrigerating machine oil is started, and the refrigerating machine oil is heated at S14 and S15 until the heating time t_heat reaches the predetermined time t_set2, and the dissolved refrigerant is discharged to the refrigerating cycle. t_set2 is obtained in advance by an experiment or the like. After the heating time timer reaches t_set2, heating is stopped in S16, and after waiting in S17 until the compressor standby time has elapsed, the compressor is started in S18 to operate the refrigeration cycle.

Further, when the outside air temperature of the refrigerator decreases, such as during the night of winter, the refrigeration cycle must be stopped for a longer time because the heat load of the refrigerator decreases. For this reason, the temperature of the compressor during stoppage decreases, the amount of refrigerant dissolved in the refrigerating machine oil increases, and there is a possibility that the refrigerant amount in the refrigeration cycle becomes insufficient. Another embodiment of the present invention for preventing such a situation will be described below based on a refrigeration cycle of the refrigerator shown in FIG. 1 and a control flowchart shown in FIG.

After the compressor 1 is stopped in S30, the temperature of the compressor 1 is detected every predetermined time in S31. Although the fan 5 continues to cool the compressor (the compressor 5 suppresses a rise in compressor temperature due to the operation of the compressor and cools it), if the cooling is subsequently performed, the compressor temperature becomes a temperature at which the refrigerant amount becomes insufficient. T_
If it has decreased to low2, the fan 5 is stopped in S33, or the rotational speed is reduced if a variable speed fan is used. T_low2 is obtained in advance by an experiment or the like.

In S34, the internal temperature T_
The interior of the refrigerator is detected, and if the temperature of the refrigerator is higher than the set temperature T_set1, the process jumps to S41, where the compressor 1 is started and cooled.
If it is equal to or lower than T_set1, it is detected whether or not the compressor temperature is lower than or equal to a temperature T_low3 at which the refrigerant amount becomes insufficient. Here, T_low3 is a temperature at which the refrigerant amount becomes insufficient unless the refrigerating machine oil is actively heated.
T_low2 is (T_low3 + ΔT), which is a temperature that has a margin for the refrigerant shortage temperature T_low3.

When the compressor temperature falls below T_low3, the refrigerating machine oil is overheated in S37, S38 and S39,
The refrigerant dissolved in the refrigerating machine oil is discharged to the refrigerating cycle. S
At 40, the internal temperature rises above the set temperature, and the compressor 1 is started at S41. However, since the refrigerant is not excessively dissolved in the refrigeration oil, the refrigeration cycle does not run out of refrigerant, and the refrigeration cycle quickly starts. Cooling can be performed.

In the above description, the restart of the compressor when the outside air temperature of the refrigerator has decreased during the nighttime in winter has been described by detecting the compressor temperature (S31, S32). And the outside air temperature T_ai
r is detected, T_air is compared with T_low2, and the outside air temperature becomes the temperature T_low2 at which the refrigerant amount becomes insufficient.
In the case where the rotation speed has decreased to a lower value, the fan 5 may be stopped or the rotation speed may be reduced when a variable speed fan is used as in S33. The subsequent operation mode is the same as S34 in FIG. In this embodiment, since it is not necessary to directly detect the outside air temperature during the winter night and to detect the compressor temperature, it can be said that this embodiment is more practical than the embodiment of FIG.

Next, another embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. The same components as those in FIG. 1 are denoted by the same reference numerals. In FIG. 2, 11 is a first evaporator, 12 is a blower fan of the first evaporator 11,
13 is a first pressure reducing means, 14 is a first opening / closing valve, 15 is a second evaporator, 16 is a blower fan of the second evaporator 15, 17 is a second pressure reducing means, and 18 is a second pressure reducing means. On-off valve, 19
Denotes a defrost heater of the second evaporator 15.

The first evaporator 11 is used for cooling the refrigerator 102 as shown in FIG.
Is used for cooling the freezing room 101. A hydrocarbon-based refrigerant such as isobutane is used as the refrigerant, and a mineral oil compatible with the refrigerating machine oil is used.

FIG. 12 shows a method for preventing the liquid refrigerant from returning to the compressor when the compressor is started in the intermittent operation and a method for preventing the liquid refrigerant from returning after the defrosting, in the refrigerator having the refrigeration cycle thus formed. This will be described below based on the flowchart shown.

When the compressor 1 in the intermittent operation is stopped, the first opening / closing means 14 (hereinafter referred to as V_R) and the second opening / closing means 18 (hereinafter referred to as V_F) are opened in S51. Low temperature first evaporator 11 and second evaporator 15
Most of the refrigerant in the refrigerating cycle stays in the second evaporator 15, but in particular, the amount of staying in the second evaporator 15 having a lower temperature (the lowest pressure during operation) increases. After a lapse of a predetermined time, S53
To open V_R and close V_F. When the inside temperature T_ inside the storage reaches the set temperature T_Set or more in S54 and S55,
The compressor 1 is started in S56.

When the compressor 1 is started, V_R 14 is opened,
When the refrigeration cycle is operated with _F18 closed, S57
Thus, the cooling in the refrigerator compartment is performed in the first evaporator 11. At this time, the liquid refrigerant retained in the second evaporator 15 does not flow into the compressor at once as the liquid refrigerant because the V_F 18 is closed.
The vaporized gas refrigerant is sucked into the compressor 1, and no liquid compression occurs in the compressor 1. When the refrigerating compartment temperature T_R is cooled below the set temperature T_Rset in S58, V_R is closed and V_F is opened in S59, and the process shifts to cooling in the freezing compartment.

Using the switching valve 20 as shown in FIG. 4 in place of the on-off valves 14 and 18, an operation equivalent to the above operation can be obtained.

Another embodiment of the present invention will be described with reference to FIGS. The same components as those described above are denoted by the same reference numerals, and description of the components will be omitted. Hereinafter, description will be made based on the flowchart shown in FIG. If the accumulated operation time t_comp of the compressor 1 since the previous defrost exceeds the predetermined time t_set in S61, the compressor 1 is stopped in S62, and the V_R14 and V_F18 are opened in S63, and S64.
Then, the second evaporator 15 is heated and defrosted by the defrosting means 19. After the completion of the defrosting, the refrigerant stays most in the first evaporator 11 which has the lowest temperature in the refrigeration cycle (the temperature of the second evaporator 15 is higher than that of the first evaporator 11 due to heating during defrosting). Become).

In this state, after a predetermined time has passed, V_
When R14 is closed and V_F18 is opened and the compressor is started in S66, the liquid refrigerant remaining in the first evaporator 11 does not flow into the compressor 1 as a liquid refrigerant at a time, and the vaporized gas refrigerant is discharged from the compressor. 1 and no liquid compression occurs in the compressor 1. S
After the freezer compartment is cooled to the set temperature T_Fset in 67 and S68, the V_R 14 is opened and the V_F 18 is closed in S69 to switch to the cooling of the refrigerator compartment. FIG. 4 in place of the on-off valves 14 and 18
As shown in (5), an operation equivalent to the above-described operation can be obtained by using the switching valve 20.

Next, another embodiment of the present invention will be described with reference to FIGS. FIG. 6 shows a machine room 26 of the refrigerator, where 1 is a compressor, 21 is a discharge pipe, 22 is a suction pipe,
Reference numerals 3 and 24 denote brazing points, and reference numeral 25 denotes an evaporating dish (a dish for storing defrosted water from the evaporator, which evaporates water collected by exhaust heat of the compressor). The compressor 1, the discharge pipe 21, and the suction pipe 22 are brazed at locations 23, 24 facing the outside of the machine room in a direction intersecting the rotation axis of the compressor 1.

FIG. 7 shows an example of connection of inlet / outlet pipes 21 and 22 of the conventional high-pressure vessel type compressor 1, in which pipes are connected in the axial direction of the rotary shaft of the compressor 1. If pipes are connected at both ends of the compressor, which is structurally horizontally long, a horizontal width is required for the pipe arrangement as shown in FIG. 7, which is disadvantageous in forming an integrated machine room structure.

In particular, it is necessary to securely braze the recessed portion by the compressor 1 and the fan 7 like the brazing portion 23, which is not preferable in terms of work.

Therefore, as shown in FIG. 6, which is an embodiment of the present invention, if the pipes 21 and 22 are connected in a direction intersecting with the rotation axis of the compressor 1, the entire circumference of the pipe connection point can be easily formed from outside the machine room. Therefore, the brazing operation can be performed easily and reliably. Further, unlike the case where there is a pipe on the left and right of the compressor 1 as shown in FIG. 7, there is no pipe on the left and right of the compressor as shown in FIG. 6, so that an integrated machine room can be formed.

[0047]

According to the present invention, since the refrigerating machine oil is heated by the refrigerating machine oil heating means and the dissolved refrigerant is discharged, the high-pressure container type compressor is started. In addition, it is possible to quickly cool the inside of the refrigerator without running out of the refrigerant in the refrigeration cycle.

According to another embodiment of the present invention, even if the ambient temperature of the refrigerator is low, the operation of the compressor cooling fan is stopped or the number of revolutions is reduced to dissolve the refrigerant in the refrigerating machine oil. The amount of the refrigerant can be reduced, and the inside of the refrigerator can be quickly cooled after the compressor is started.

According to another embodiment of the present invention, in a refrigerator having two evaporators, the on-off valve on the low-temperature side evaporator is closed and the on-off valve on the high-temperature side evaporator is opened when the compressor is started. Thus, the liquid refrigerant that has accumulated in the low-temperature side evaporator can be gradually vaporized and sucked into the compressor, so that the liquid refrigerant does not flow into the compression section (for example, a cylinder) and a highly reliable refrigerator is provided. can do.

According to another embodiment of the present invention, in a refrigerator having two evaporators, when the compressor is started after defrosting of the low-temperature evaporator, the on-off valve on the low-temperature evaporator side is opened, By closing the on-off valve on the high-temperature side evaporator side, the liquid refrigerant retained in the high-temperature side evaporator can be gradually vaporized and sucked into the compressor, and the liquid refrigerant does not flow into the compression section, A highly reliable refrigerator can be provided.

Further, by connecting the compressor container and the pipe in a direction intersecting when viewed from the rotation axis of the compressor, the horizontal type high pressure container type rotary compressor can be efficiently stored in the machine room.
Even if a hydrocarbon-based refrigerant such as isobutane that is compatible with mineral oil, which is a refrigerating machine oil, is used, a large-sized compressor can be efficiently stored without reducing the food storage space.

[Brief description of the drawings]

FIG. 1 is a diagram showing a refrigeration cycle of a refrigerator according to an embodiment of the present invention.

FIG. 2 is a diagram showing another refrigeration cycle of the refrigerator according to the embodiment.

FIG. 3 is a diagram illustrating a configuration of a refrigerator according to the embodiment of the present invention.

FIG. 4 is a view showing a modification of another refrigeration cycle of the refrigerator according to the embodiment.

FIG. 5 is a diagram showing a configuration of a conventional refrigerator.

FIG. 6 is a diagram showing an arrangement around a compressor of the refrigerator according to the embodiment of the present invention.

FIG. 7 is a diagram showing an arrangement around a compressor of a conventional refrigerator.

FIG. 8 is a control flowchart relating to heating of refrigerator oil in a refrigerator according to the embodiment of the present invention.

FIG. 9 is another control flowchart relating to refrigerator oil heating of the refrigerator according to the embodiment of the present invention.

FIG. 10 is a control flowchart for starting a compressor according to the related art.

FIG. 11 is a control flowchart relating to refrigerator oil heating of the refrigerator according to the embodiment of the present invention.

FIG. 12 is a control flowchart relating to the refrigeration cycle shown in FIG. 2;

FIG. 13 is another control flowchart relating to the refrigeration cycle shown in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Condenser 3 Decompression device 4 Evaporator 5 Cooling fan 6 Blow fan 7 Refrigerator oil heating means 8 Compressor temperature detecting means 9 Outside air temperature detecting means 10 Control means 11 First evaporator 12 Cooling fan 13 First Decompression device 14 First on-off valve 15 Second evaporator 16 Cooling fan 17 Second decompression device 18 Second on-off valve 19 Defrost heater 20 Switching valve

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Taichi, Inventor Store Network 800, Tomita, Odai-machi, Ohira-cho, Shimotsuga-gun, Tochigi Prefecture Inside the Hitachi, Ltd.Cooling Division (72) Hiroaki Matsushima 502, Kandachicho, Tsuchiura-shi, Ibaraki, Japan F-term in Ritsumeikan Machinery Laboratory (reference) 3L045 AA02 BA01 CA02 DA02 EA01 HA01 HA02 JA14 JA15 LA07 LA10 LA14 MA05 NA03 NA19 NA22 PA03 PA04 PA05 3L046 AA02 BA01 CA06 GA03 HA01 JA07 LA02 LA15 LA16 MA03 MA04 MA05

Claims (6)

[Claims] 1. A high pressure vessel type compressor, a condenser, a pressure reducing means,
A refrigerator having a refrigerating cycle in which an evaporator is formed in a series closed circuit, comprising: heating means for heating refrigerating machine oil sealed in a high-pressure container of the compressor; The refrigerator is characterized in that the compressor is started after the refrigerating machine oil is heated by the heating means until the temperature rises to a temperature that does not cause a shortage of the refrigerant amount. 2. A high pressure vessel type compressor, a condenser, a pressure reducing means,
A refrigeration cycle formed by forming an evaporator in a series closed circuit;
A refrigerator comprising: a blower fan of the evaporator; and an outside air temperature detecting unit that detects an outside air temperature, wherein a heating unit that heats refrigerating machine oil sealed in a high-pressure container of the compressor is provided. After the operation of the compressor is stopped, if the detected outside air temperature is reduced to a temperature near the shortage of the refrigerant amount, the cooling fan of the compressor is stopped or the rotation speed of the cooling fan is reduced. A refrigerator comprising: starting the compressor after heating the refrigerating machine oil until the compressor temperature rises to a temperature at which a shortage of refrigerant does not occur. 3. A high pressure vessel type compressor, a condenser, a first decompression means, a first evaporator, a second evacuation means and a second evaporator provided in parallel with the flow path of the first evaporator. A refrigeration cycle having a pressure reducing means and a second evaporator, a means for switching a flow path to the first evaporator and the second evaporator, a cooling fan for the compressor, the first and second A refrigerator comprising: a blower fan for an evaporator; and at least two chambers having different temperatures corresponding to the first and second evaporators, wherein after stopping the compressor that operates intermittently, With the flow path on the low-temperature side evaporator side closed in the first and second evaporators,
The refrigerator according to claim 1, wherein the compressor is restarted in accordance with temperature control in the refrigerator. 4. A high pressure vessel type compressor, a condenser, a first decompression means, a first evaporator, a second evacuation means and a second evaporator provided in parallel with a flow path of the first evaporator. A refrigeration cycle having a pressure reducing means and a second evaporator, a means for switching a flow path to the first evaporator and the second evaporator, a cooling fan for the compressor, the first and second A refrigerator comprising: a blowing fan of an evaporator; at least two chambers having different temperatures corresponding to the first and second evaporators; and a defrosting unit for the second evaporator. At the time of defrosting the second evaporator on the low temperature side, the compressor is stopped to perform defrosting by heating by the defrosting means, and after the defrosting is completed, the flow path to the first evaporator is closed and the second The compressor is restarted by switching the flow path by the flow path switching means so as to open the flow path to the evaporator, and the second evaporator is opened. Refrigerator, characterized in that cooling the chamber to respond. 5. The refrigerator according to claim 1, wherein the high-pressure container type compressor is a horizontal type compressor, and the compressor is arranged in a direction intersecting a rotation axis of the compressor. Characterized by forming a conduit connected to the high-pressure container of (1). 6. The refrigerator according to claim 1, wherein a hydrocarbon-based refrigerant such as isobutane is sealed in the refrigerant.