JP5094654B2 - refrigerator - Google Patents

Description

  The present invention relates to a refrigerator, and more particularly to a refrigerator that prevents the generation of refrigerant noise due to the reverse flow of refrigerant in a refrigeration cycle.

  In a conventional refrigerator refrigeration cycle, a low-pressure shell reciprocating compressor, a condenser, a dryer, a capillary tube, an evaporator, an accumulator, and a suction pipe are sequentially connected, and a check valve is provided upstream of the suction pipe (for example, Patent Document 1).

  In such a refrigeration cycle, during the compression operation, the downstream side of the compressor has a high pressure, and the upstream side of the refrigerant has a low pressure through the capillary. On the other hand, when the internal temperature is cooled to a predetermined temperature and the compressor is stopped, the refrigerant on the high-pressure side of the condenser flows into the evaporator through the capillary tube, and the pressure on the downstream side and the upstream side of the compressor is balanced. At this time, since the compressor is a low pressure shell reciprocating type, liquid refrigerant does not flow from the high pressure side to the low pressure side of the compressor.

  In addition, when the compressor is stopped and during defrosting operation, liquid refrigerant flows into the suction pipe on the low pressure side from the high pressure side, and the liquid refrigerant is accidentally evaporated in the suction pipe, so that the refrigerant is sucked vigorously. Although it flows through the pipe and attempts to flow back into the accumulator, the liquid refrigerant does not flow back into the accumulator by the check valve, so that no refrigerant noise is generated.

JP 2002-5557 A (page 4-6, FIG. 2, FIG. 5)

According to the refrigerator of Patent Document 1 as described above, it is possible to obtain a silent refrigerator by suppressing the generation of refrigerant noise due to the reverse flow of refrigerant in the accumulator, but to suppress the generation of refrigerant noise. In addition, since a check valve is provided in the suction pipe, there is a problem that the cost increases.
In addition, when an abnormality occurs in the check valve, not only the generation of refrigerant noise cannot be suppressed, but also the refrigeration cycle becomes abnormal and there is a risk of causing refrigerator cooling abnormality.

  Furthermore, since the accumulator flows in from the lower part and flows out from the upper part, the gas refrigerant passes through the liquid refrigerant accumulated in the accumulator mainly during operation or long-term defrosting operation, and the gas-liquid interface There was a problem that an unpleasant noise of popping popping was generated.

  The present invention has been made to solve the above-described problems, and can reduce the cost, reliably prevent the generation of refrigerant noise, and can be reliably prevented from causing unpleasant noise in the accumulator. It aims at providing a high refrigerator.

The refrigerator according to the present invention includes a refrigeration cycle in which refrigerant discharged from the compressor returns to the compressor again through a condenser, a capillary tube, an evaporator, an accumulator, and a suction pipe, and the compressor is provided with a low-pressure shell compressor. And a heat exchange range in which heat exchange is performed by joining the capillary tube and the suction pipe with a heat conductive material in the heat insulating material of the refrigerator outer shell, and the suction of the heat exchange range is performed in the operation state immediately before the compressor is stopped. refrigerant temperature at the inlet of the tube, the inlet side of the evaporator, the internal, and each to be higher 10 ° C. or higher than the average temperature at the position of the outgoing side, and adjusts the circulation amount of the refrigerant.

According to the present invention, since the liquid refrigerant flowing into the suction pipe can be gradually evaporated when the operation is stopped or during the defrosting operation, the refrigerant violently flows back from the suction pipe to the accumulator due to accidental evaporation. Thus, it is possible to prevent the generation of a loud refrigerant sound.
In addition, since the refrigeration cycle is configured without using functional parts such as valves, the cost can be reduced, and furthermore, there is no possibility of causing abnormalities in the refrigeration cycle due to abnormalities in the valves and the like, so the reliability is high. A refrigerator can be provided at low cost.

[Embodiment 1]
1 is a configuration explanatory diagram of a refrigeration cycle of a refrigerator according to Embodiment 1 of the present invention, FIG. 2 is a graph showing the relationship between the refrigerant amount and temperature in the refrigeration cycle of FIG. 1, and FIG. 3 is a diagram of the refrigeration cycle of FIG. It is explanatory drawing which shows the distribution state of the refrigerant | coolant (a liquid refrigerant and a gas refrigerant | coolant) several minutes after an operation stop and a driving | operation cancellation or a defrosting operation start.

As shown in FIG. 1, the refrigeration cycle of the refrigerator according to Embodiment 1 of the present invention includes a low-pressure shell compressor 1 (may be simply referred to as a compressor in the following description), a condenser (condenser) 2, The capillary 3, the evaporator 4, the accumulator 5 and the suction pipe 6 are connected in order and returned to the compressor 1 again.
A portion 10 surrounded by a broken line in FIG. 1 is a heat insulating material 24 on the back side of a refrigerator outer wall 21 made of an outer box 22 made of a metal plate, an inner box 23 made of a resin molded product, and a heat insulating material 24 filled therebetween. A range in which the capillary tube 3 and the suction tube 6 are joined together with a material having good heat conduction such as solder (hereinafter referred to as a heat conduction material) to perform heat exchange is shown (in the following description, The range is referred to as the heat exchange range 10).

  In such a configuration, a length of about 500 mm is required from the accumulator 5 of the suction pipe 6 to the heat exchanging range 10 due to problems of piping and welding workability. The total length of the capillary tube 3 and the suction tube 6 is about 2500 mm to 3000 mm, and the length of the heat exchange range 10 is about 2000 mm. The capillary tube 3 and the suction tube 6 in the heat exchange range 10 are fixed to the inner box 23 with an adhesive tape or the like in order to prevent a positional shift during foaming of the heat insulating material 24 during manufacture of the refrigerator. ing.

In the refrigerator according to the present embodiment configured as described above, the inlet of the intake pipe 6 in the heat exchange range 10 during the refrigeration cycle operation is achieved by setting the amount of refrigerant to the amount A as shown on the horizontal axis of FIG. Is the refrigerant temperature Ts (specifically, the temperature of the suction pipe 6 is measured), the average evaporation temperature Te of the evaporator 4 (refrigerant temperature Te on the inlet side, inside, and outlet side of the evaporator 4 in FIG. 1). ₁ , Te ₂ , and Te ₃ ), which is higher by 10 ° C. or more. In this case, the upper limit of the refrigerant temperature Ts at the inlet of the suction pipe 6 is preferably equal to or lower than the outside air temperature. For reference, FIG. 2 also shows the refrigerant temperature Ts ₁ in the substantially middle portion of the suction pipe 6 in the heat exchange range 10 with respect to the refrigerant amount and the refrigerant temperature Ts ₂ on the inlet side of the compressor 1.

Since the present embodiment is configured as described above, as shown in FIG. 3A, the suction pipe 6 is almost filled with the gas refrigerant r ₂ during the refrigeration cycle operation, and the operation is performed in this state. When the operation is stopped or the defrosting operation is started, the liquid refrigerant r ₁ flows from the high pressure side evaporator 4 through the accumulator 5 into the low pressure side suction pipe 6, but as shown in FIG. gradually evaporated in the vicinity of the inlet tube 6 (near the outlet of the accumulator 5) is vaporized, the gas refrigerant r _2.

For comparison with the present embodiment, when the refrigerant amount in FIG. 2 is B, the difference between the refrigerant temperature Ts at the inlet of the suction pipe 6 in the heat exchange range 10 and the average evaporation temperature Te of the evaporator 4 is as follows. Is less than 10 ° C.
In such a case, as shown in FIG. 4A, during the refrigeration cycle operation, the inside of the suction pipe 6 is liquid from the outlet of the accumulator 5 to the inlet of the heat exchange range 10 and a part of the heat exchange range 10. Since it is the refrigerant r ₁ , the refrigerant temperature at the inlet of the suction pipe 6 in the heat exchange range 10 is low.

When the operation is stopped or the defrosting operation is started in this state, the liquid refrigerant r ₁ flows into the suction pipe 6 from the high-pressure side evaporator 4 through the accumulator 5, but the suction pipe is low because the temperature is low. 6 stays upstream. During this time, since vaporization in the evaporator 4 continues, a gas-liquid two-phase refrigerant flows into the accumulator 5 and the suction pipe 6 and stays in a two-phase state in which the gas refrigerant is compressed in the vicinity of the upstream side of the suction pipe 6. .

In this state, when the top of the liquid refrigerant r ₁ reaches a high temperature portion near the middle stream of the suction pipe 6, accidental evaporation occurs, and the refrigerant violently flows in the suction pipe 6 due to the expansion of the volume due to this evaporation, and FIG. As shown in b), a loud sound (refrigerant sound) is generated when the gas refrigerant r ₂ compressed by flowing back into the accumulator 5 is released in the accumulator 5.

  In the present embodiment, the refrigerant amount is adjusted as described above, and the refrigerant temperature Ts at the inlet of the suction pipe 6 in the heat exchange range 10 is refrigerated so as to be higher by 10 ° C. than the average evaporation temperature Te of the evaporator 4. Since the cycle is configured, the phenomenon described with reference to FIG. 4 does not occur, and therefore no loud refrigerant noise is generated.

  According to the present embodiment, by adjusting the amount of refrigerant, the refrigerant temperature Ts at the inlet of the suction pipe 6 in the heat exchange range 10 is the average evaporation temperature of the evaporator 4 immediately before the compressor 1 is stopped. Since it is configured to be higher than Te by 10 ° C. or more, the liquid refrigerant flowing into the suction pipe 6 can be gradually evaporated when the operation is stopped or during the defrosting operation, and the refrigerant is removed from the suction pipe 6 by accidental evaporation. It is possible to prevent the refrigerant from generating a large refrigerant sound due to the strong backflow in the flow.

  Further, in the present invention, since the refrigeration cycle is configured without providing functional parts such as valves, the cost can be reduced, and furthermore, there is no possibility of causing abnormalities in the refrigeration cycle due to abnormalities in the valves and the like. A highly reliable refrigerator can be provided at low cost.

[Embodiment 2]
FIG. 5 is an explanatory diagram showing the air path configuration of the refrigerator according to Embodiment 2 of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals.
A partition wall 25 is provided on the front side of the inner box 23 on the back side of the refrigerator outer wall 21 constituting the refrigerator 20 with a gap between the inner box 23 and a partition plate 27a. A cooler chamber 27 is formed, and a cooling air passage 26 is formed between the partition wall 25 and the inner box 23 and the partition plate 27a. In addition, air outlets 25 a and 25 b for blowing cooling air from the cooling air passage 26 to the refrigerating chamber 28 are provided at the upper portion of the partition wall 25, and the lower end portion of the cooling air passage 26 opens to the freezer compartment 30. Yes. In addition, 29 is a vegetable room, 31 is a door which opens and closes the front opening part of each room.

  The cooler chamber 27 is provided with the evaporator 4 and an internal fan 11 for sending the air cooled by the evaporator 4 to the cooling air passage 26, and the like (in the middle of the cooling air passage 26) Between the inner blower 11 and the outlets 25a, 25b), a refrigeration damper 12 for controlling the amount of cooling air sent to the refrigeration chamber 28 is provided. Although not shown in the figure, a heat exchange range 10 in which the capillary tube 3 and the suction pipe 6 are joined by a heat conductive material is provided in the heat insulating material 24 on the back side of the refrigerator outer wall 21, and the refrigerator compartment 28 is also provided. A refrigerator temperature sensor is provided inside, and a freezer temperature sensor is provided inside the freezer compartment 30.

  The opening and closing of the refrigeration damper 12 is controlled by a control unit (not shown) based on the temperature detected by the cold room temperature sensor, and the compressor 1 is operated by the control unit based on the temperature detected by the freezer temperature sensor. Start and stop are controlled. In such a configuration, the control unit controls the compressor 1 and the refrigeration damper 12 to operate with the refrigeration damper 12 opened for a certain period of time before the operation of the compressor 1 is stopped. Specifically, for example, when the temperature detected by the freezer temperature sensor exceeds the compressor stop temperature set in the control unit, a control method is performed in which the refrigeration damper 12 is opened for a predetermined time.

  In the present embodiment, by the operation of the compressor 1, the air in the cooler chamber 27 cooled by the evaporator 4 is sent to the cooling air passage 26 as cooling air by the internal fan 11, A part is blown out from the outlets 25a and 25b through the refrigeration damper 12 to the refrigeration chamber 28, and after cooling the inside of the refrigeration chamber 28, the vegetable compartment 29 is cooled as indicated by a broken line and returns to the cooler compartment 27 from below. At this time, the opening degree of the refrigeration damper 12 is adjusted based on the temperature detected by the refrigeration room temperature sensor. A part of the air sent to the cooling air passage 26 by the internal blower 11 is introduced into the freezer compartment 30 to cool the freezer compartment 30 and then returns to the cooler compartment 27 as indicated by a broken line.

When the temperature of the freezer compartment 29 detected by the freezer compartment temperature sensor exceeds the compressor stop temperature, for example, the operation of the compressor 1 is stopped, and immediately before that, the refrigerator 12 is fully opened for a certain time. Then, the vaporization of the refrigerant in the evaporator 4 is promoted, and the refrigerant temperature Ts at the inlet of the suction pipe 6 in the heat exchange range 10 is created to be 10 ° C. higher than the average evaporation temperature Te of the evaporator 4. Stop. Thereby, generation | occurrence | production of the refrigerant | coolant sound resulting from accidental evaporation of the liquid refrigerant in the suction pipe 6 during the operation stop or defrosting operation can be prevented. Note that this embodiment may be implemented alone or in combination with the first embodiment.
According to the present embodiment, substantially the same effect as in the first embodiment can be obtained.

[Embodiment 3]
In the present embodiment, the rotation speed of the internal fan 11 of FIG. 5 can be controlled stepwise by the control unit, and the internal fan 11 is rotated at a high speed for a certain period of time immediately before the compressor 1 is stopped. It is what I did.

As described above, by rotating the internal fan 11 at a high speed for a certain period of time immediately before the operation of the compressor 1 is stopped, the vaporization of the refrigerant in the evaporator 4 is promoted, and the inlet temperature Ts of the suction pipe 6 in the heat exchange range 10 is A state that is 10 ° C. higher than the average evaporation temperature Te of the evaporator 4 is created, and the compressor 1 is stopped in this state. Thereby, generation | occurrence | production of the sound resulting from accidental evaporation of the liquid refrigerant in the suction pipe 6 during operation stop or defrosting operation can be prevented. In addition, this Embodiment may be implemented independently or may be implemented in combination with both or one of Embodiments 1 and 2.
According to the present embodiment, substantially the same effect as in the first embodiment can be obtained.

[Embodiment 4]
In the refrigerator according to any one of the first to third embodiments, the present embodiment is configured such that the number of revolutions of the compressor 1 can be controlled stepwise by the control unit, and the constant immediately before the compressor 1 is stopped. The compressor 1 is rotated at low speed over time.

In this way, the amount of refrigerant flowing out of the evaporator 4 is reduced by rotating the compressor 1 at a low speed for a certain period of time immediately before the operation of the compressor 1 is stopped, and the heat exchange range of the gas refrigerant vaporized in the evaporator 4 The refrigerant temperature Ts at the inlet of the ten suction pipes 6 is 10 ° C. or higher than the average evaporation temperature Te of the evaporator 4, and the operation of the compressor 1 is stopped in this state. Thereby, generation | occurrence | production of the refrigerant | coolant sound resulting from accidental evaporation of the liquid refrigerant in the suction pipe 6 during operation stop or defrosting operation can be prevented. In addition, although the case where this Embodiment is implemented in the refrigerator in any one of Embodiment 1-3 in the said description was shown, this Embodiment can also be implemented.
According to the present embodiment, substantially the same effect as in the first embodiment can be obtained.

  In the above description, in order to make the inlet temperature Ts of the refrigerant in the suction pipe 6 higher by 10 ° C. or more than the average evaporation temperature Te of the evaporator 4, adjustment of the refrigerant amount, adjustment of the opening degree of the refrigeration damper 12, Although the case where adjustment of rotation speed (air flow rate) and rotation adjustment of the compressor 1 is performed has been shown, the means for increasing the temperature by 10 ° C. or more is not limited to these. This can also be achieved by adjusting the blade diameter, evaporator pipe internal volume, condenser pipe internal volume, capillary inner diameter (throttle amount), accumulator storage internal volume, intake pipe arrangement in the outer insulation, etc. Can do.

[Embodiment 5]
FIG. 6 is an explanatory view of an accumulator for a refrigerator according to Embodiment 5 of the present invention.
In this embodiment, an accumulator 5 as shown in FIG. 6 is used in any one of the refrigerators according to the first to fourth embodiments.

In the accumulator 5 of the refrigerator according to the present embodiment, the liquid refrigerant r ₁ from the evaporator 4 flows in from the inlet 5a provided in the upper part of the accumulator 5, and flows out to the suction pipe 6 from the outlet 5b provided in the lower part. It is comprised as follows.
By configuring the accumulator 5 in this way, it is possible not only to prevent generation of sound due to accidental evaporation of the liquid refrigerant r ₁ in the suction pipe 6, but also to stay in the accumulator 5 as in the prior art. Generation of an unpleasant noise caused by the gas refrigerant passing from below through the liquid refrigerant r ₁ can be prevented.

It is composition explanatory drawing of the refrigerating cycle of the refrigerator which concerns on Embodiment 1 of this invention. It is a graph which shows the relationship between the refrigerant | coolant amount and temperature in the refrigerating cycle of FIG. It is explanatory drawing which shows the distribution state of the refrigerant | coolant several minutes after the driving | operation stop of the refrigeration cycle of FIG. It is explanatory drawing of the other example of FIG. It is explanatory drawing of the refrigerator which concerns on Embodiment 2 of this invention. It is explanatory drawing of the accumulator of the refrigerator which concerns on Embodiment 5 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Compressor (low pressure shell compressor), 2 condensers, 3 capillaries, 4 evaporators, 5 accumulators, 6 suction pipes, 10 heat exchange ranges, 11 internal fans, 12 refrigeration dampers, 20 refrigerators, 21 refrigerator outlines, 24 heat insulation Material, 25 partition, 25a, 25b outlet, 26 cooling air passage, 27 cooler room, 28 refrigerator room, 30 freezer room.

Claims (6)

The refrigerant discharged from the compressor has a refrigeration cycle that returns to the compressor again through a condenser, a capillary tube, an evaporator, an accumulator, and a suction pipe,
A low-pressure shell compressor is used as the compressor, and a heat exchange range is provided in which heat exchange is performed by joining the capillary tube and the suction pipe with a heat conductive material in the heat insulating material of the refrigerator outer shell,
In the operating state immediately before the compressor is stopped, the refrigerant temperature at the inlet of the suction pipe in the heat exchange range is 10 ° C. or higher than the average temperature at the inlet side, inside, and outlet side of the evaporator. The refrigerator characterized by adjusting the circulation amount of the refrigerant so as to increase. The refrigerant discharged from the compressor has a refrigeration cycle that returns to the compressor again through a condenser, a capillary tube, an evaporator, an accumulator, and a suction pipe,
A low-pressure shell compressor is used as the compressor, and a heat exchange range is provided in which heat exchange is performed by joining the capillary tube and the suction pipe with a heat conductive material in the heat insulating material of the refrigerator outer shell,
In the operating state immediately before the compressor is stopped, the refrigerant temperature at the inlet of the suction pipe in the heat exchange range is 10 ° C. or higher than the average temperature at the inlet side, inside, and outlet side of the evaporator. as higher, refrigerator, characterized in that the the cooling air passage of the refrigerator provided refrigeration damper for air flow regulation, operating the refrigerator in the blower fully opened for a predetermined time the refrigerating damper before stop of the compressor . The refrigerant discharged from the compressor has a refrigeration cycle that returns to the compressor again through a condenser, a capillary tube, an evaporator, an accumulator, and a suction pipe,
A low-pressure shell compressor is used as the compressor, and a heat exchange range is provided in which heat exchange is performed by joining the capillary tube and the suction pipe with a heat conductive material in the heat insulating material of the refrigerator outer shell,
In the operating state immediately before the compressor is stopped, the refrigerant temperature at the inlet of the suction pipe in the heat exchange range is 10 ° C. or higher than the average temperature at the inlet side, inside, and outlet side of the evaporator. as increases, the refrigerator, wherein a storage room fan of the refrigerator is operated at predetermined time fast before stop of the compressor.   The refrigerator according to any one of claims 1 to 3, wherein the number of revolutions of the compressor is adjustable stepwise, and the compressor is operated at a low speed for a predetermined time before the compressor is stopped.   The refrigerator according to any one of claims 2 to 4, wherein each of the techniques is executed independently.   The refrigerator according to any one of claims 1 to 5, wherein the accumulator is configured such that the refrigerant from the evaporator flows in from the upper part and flows out from the lower part to the suction pipe.

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