JPH06117743A - Refrigerator - Google Patents

Abstract

PURPOSE:To provide a refrigerator which is capable of reducing noise, such as growl even when using a plurality of multi-blade cooling fans in order to increase the circulation air in the refrigerator. CONSTITUTION:The refrigerator is designed to circulate the air cooled by an heat exchange with a vaporizer 5 installed in a refrigeration cycle having a compressor 3, a condenser, a pressure reducing apparatus and a vaporizer 5 and operates by changing the rotary speed of a plurality of multi-blade fans 6a installed in parallel so as to cool the interior of a refrigerator comprising an insulated box member 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator / freezer, and more particularly to a refrigerator / freezer having a plurality of multi-blade fans for cooling the inside of the refrigerator.

[0002]

11 is a side sectional view showing a conventional refrigerator-freezer, and FIG. 12 is a sectional view showing a front upper portion of the refrigerator-freezer shown in FIG. In the figure, 1 is a heat-insulating box forming the outline of a refrigerator-freezer, 2 is a machine room located at the bottom of the refrigerator-freezer, 3 is a compressor for compressing a refrigerant, 4 is a fan for cooling the machine room, 5 is a refrigerant for evaporating the refrigerant. An evaporator functioning as a heat exchanger, 6 is a multi-blade fan for cooling the inside of the compartment, which circulates air cooled by heat exchange with the evaporator 5 to cool the inside of the compartment, 7
The arrow indicates the airflow flowing in the refrigerator.

Next, the operation of the refrigerator-freezer thus constructed will be described. In this refrigerator-freezer, when the airflow 7 forcibly flowing by the multi-blade fan 6 for cooling the inside of the heat insulating box 1 (that is, the inside of the inside) passes through the evaporator 5, It is cooled by heat exchange with the evaporator 5, and this circulates in the refrigerator, thereby lowering the temperature in the refrigerator. Further, in the machine room 2, the machine room cooling fan 4 is operated to suppress the temperature rise of the compressor 3 during the operation of the compressor 3 and forcedly convection to promote heat dissipation of the compressor 3. Then, the start timings of the three electric motors of the compressor 3, the machine room cooling fan 4, and the multi-blade fan 6 for cooling the inside of the refrigerator are deviated to reduce the operation start noise of the refrigerator-freezer.

FIG. 13 is a time chart showing the operating state of each electric motor of a conventional refrigerator-freezer, and shows the timing of starting and stopping each electric motor. As shown in FIG. 13, the compressor 3, the machine room cooling fan 4, and the multi-blade fan 6 for cooling the interior
By sequentially starting and stopping each electric motor of, the change in the loudness between the time of stop and the time of operation changes in stages,
The sensation level when starting or stopping is reduced.

As related to this type of conventional freezer / refrigerator, Japanese Patent Laid-Open No. 59-160095 and Japanese Patent Laid-Open No. 1-9595 have been proposed.
The techniques described in JP-A-142348 and JP-A-2-254998 can be mentioned. JP-A-59-1600
Japanese Patent Laid-Open No. 95-95 discloses a technique for starting a plurality of fans by sequentially shifting the timing.
Japanese Patent No. 42348 discloses a technique for preventing roaring noise by making the number of blades of a plurality of multi-blade fans mutually unrelated to each other. And, JP-A-2-25499
Japanese Unexamined Patent Publication No. 8 discloses a technique of switching a plurality of fans with a time difference when switching the rotation speed of the fans.

[0006]

In the conventional refrigerator / freezer as described above, a larger cooling capacity has been required due to the increase in size and diversification of the refrigerator / freezer. As a countermeasure for this, there is a method of increasing the amount of circulating air in the refrigerator, and a plurality of multi-blade fans 6 for cooling the refrigerator are provided in parallel to increase the amount of circulating air.

However, at this time, when a plurality of multi-blade fans 6 are operated, a growl noise is generated. In addition, there is an adverse effect that the start-up sound and the stop sound become louder than in the case of one multi-blade fan 6.

Therefore, it is an object of the present invention to provide a refrigerating refrigerator capable of reducing noise such as groaning noise even if a plurality of multi-blade fans 6 for cooling the inside of the refrigerator are used to increase the amount of circulating air inside the refrigerator. It is what

[0009]

According to a first aspect of the present invention, there is provided a refrigerating refrigerator having a compressor, a condenser, a decompressor, and a refrigerant circulation refrigeration cycle for heat exchange with the evaporator. A plurality of multi-blade fans arranged in parallel to circulate the cooled air to cool the inside of the heat insulating box, and a rotation speed control means for operating by changing the rotation speed of each of the plurality of multi-blade fans. It is equipped with.

According to a second aspect of the present invention, in addition to the same refrigerating cycle, the multi-blade fan, and the rotation speed control means as in the above-mentioned first aspect, the plurality of multi-blade fan electric motors, compressor electric motors, It is provided with a start / stop control means for operating by changing the timing of starting and stopping the electric motor of the machine room cooling fan.

According to a third aspect of the present invention, in addition to the refrigerating cycle similar to the first aspect, the multi-blade fan, the rotation speed control means, and the start / stop control means similar to the second aspect, the plurality of the refrigerators and refrigerators are provided. The multi-blade fan is provided with a start-stop sequence control means for operating by changing the start sequence and the stop sequence of the multi-blade fan each time the compressor is activated.

[0012]

In the refrigerating refrigerator according to the first aspect of the present invention, the air cooled by heat exchange with the evaporator in the refrigerating cycle for circulating the refrigerant is circulated to cool the inside of the heat insulating box in parallel. Since the operation is performed by changing the rotation speed of each of the multi-blade fans provided, it is possible to reduce the howling noise caused by the interference during the operation of the multi-blade fans for cooling the inside of the refrigerator.

In the refrigerator according to the invention of claim 2,
The air cooled by heat exchange with the evaporator in the refrigeration cycle for circulating the refrigerant is circulated to cool the inside of the heat insulating box by changing the rotation speeds of the multi-blade fans arranged in parallel. Since the operation is performed while changing the start and stop timings of the electric motors of the multi-blade fans, the electric motors of the compressors, and the electric motors of the machine room cooling fans, the plural multi-blade for cooling the inside of the refrigerator Not only can the growl noise caused by interference during fan operation be reduced, but also abrupt changes in the sound during startup and shutdown can be prevented.

In the refrigerator according to the third aspect of the present invention,
The air cooled by heat exchange with the evaporator in the refrigeration cycle for circulating the refrigerant is circulated to cool the inside of the heat insulating box by changing the rotation speeds of the multi-blade fans arranged in parallel. In addition to the operation, the start and stop timings of the multi-blade fan electric motor, the compressor electric motor, and the machine room cooling fan electric motor are changed, respectively. Since the compressor is operated differently each time the compressor is started, it is possible to reduce the humming noise caused by the interference during the operation of multiple multi-blade fans for cooling the inside of the refrigerator, as well as to reduce the sudden noise at the time of starting and stopping. The change can be prevented, and the operation times of the plurality of multi-blade fans can be averaged, and the direction of the air flow passing through the evaporator changes immediately after the start-up.

[0015]

Embodiments of the present invention will be described below. <First Embodiment> FIG. 1 is a side sectional view showing a refrigerator-freezer according to a first embodiment of the present invention, and FIG. 2 is a sectional view showing a front upper portion of the refrigerator-freezer of FIG. In the figure, the same reference numerals and symbols as those of the above-mentioned conventional example indicate the same or corresponding components as those of the above-mentioned conventional example. In the figure, 6a is a multi-blade fan for cooling the interior, 6b is also a multi-blade fan for cooling the interior, and the two multi-blade fans 6a and 6b are arranged close to each other in a laterally parallel manner. There is.

Next, the operation of the refrigerator-freezer thus constructed will be described. In the freezer-refrigerator of this embodiment, the airflow 7 forcibly flowing by the two multi-blade fans 6a, 6b for cooling the inside of the heat-insulating box 1 (that is, inside the refrigerator) evaporates. When passing through the vessel 5, it is cooled by heat exchange with the evaporator 5, and this circulates in the vessel, thereby lowering the temperature inside the vessel. In the machine room 2, the compressor 3
In order to suppress the temperature rise of the compressor 3 during operation, the machine room cooling fan 4 is operated and forcedly convected to promote heat dissipation of the compressor 3.

In this embodiment, the operating speeds of the two multi-blade fans 6a and 6b for cooling the inside of the refrigerator in FIG. 2 are different from each other. Therefore, no roaring noise is generated due to the interference of the two multi-blade fans 6a and 6b. Actually, the growl noise is generated when the frequency of the sound of the rotation components of the two multi-blade fans 6a and 6b is 2 to 3 Hz. To eliminate the growl sound,
The frequency of the sound of the rotation component may be different by 5 Hz or more.

For example, a case of multi-blade fans 6a and 6b having three blades as shown in FIG. 2 will be described. When the multi-blade fan 6a for cooling the interior is driven at a frequency of 60 Hz, the frequency of the sound of the rotation component is 60 Hz × 0.5 (slip) × 3 (sheets) = 90 Hz. At this time, in order to prevent the howling sound, the frequency of the sound of the multi-blade fan 6a may be separated from 90 Hz to 5 Hz. When this is calculated backward, 85 Hz / {0.5 (slip) × 3 (sheets)} = 56.7
It becomes Hz. Therefore, the driving frequency is shifted by 5 Hz to 5
If it is set to 5 Hz, howling noise can be sufficiently prevented.

As described above, in the refrigerator-freezer of the present embodiment, the already known refrigeration cycle for circulating the refrigerant having the compressor 3, the condenser, the decompressor and the evaporator 5 and the heat exchange with the evaporator 5 are carried out. Two (plural) multi-blade fans 6a, 6b arranged in parallel to circulate the air cooled by the above and cool the inside of the heat insulating box 1, and the two (plural) multi-blade fans 6a , 6b, respectively, and rotation speed control means for operating by changing the rotation speed.

That is, the refrigerating refrigerator of this embodiment circulates the air cooled by heat exchange with the evaporator 5 in the refrigerating cycle for circulating the refrigerant, and cools the inside of the heat insulating box 1 by two (Multiple) multi-blade fans 6a, 6 arranged in parallel
The operation is performed by changing the rotation speed of b. Therefore, two (plural) multi-blade fans 6a, 6b for cooling the inside of the refrigerator
The roaring noise caused by interference during operation can be reduced, and the overall noise can be suppressed, resulting in a quiet refrigerator / freezer.

<Second Embodiment> FIG. 3 is a time chart showing the operating states of the electric motors of the refrigerator / freezer according to the second embodiment of the present invention, showing the start and stop timings of the electric motors. As shown in the figure, first, the multi-blade fan 6a for cooling the interior
Then, the electric motors are sequentially activated in the order of the multi-blade fan 6b for cooling the inside of the refrigerator, the fan 4 for cooling the machine room, and the compressor 3. As a result, the activation sound level can be gently increased and the sensible sound level can be reduced. Therefore, it is possible to reduce the discomfort caused by the noise given to the user. Further, at the time of stop, each electric motor can be stopped in the reverse order to that at the time of start-up, and similarly, the change of the sound level can be gently lowered to lower the sensation level. Thus, the compressor 3, the machine room cooling fan 4, the multi-blade fan 6
The start and stop timings of the electric motors a and 6b are staggered to eliminate a sudden change in the sound level when starting and stopping the refrigerator. The other structure is the same as that of the first embodiment.

In this way, the refrigerator-freezer of this embodiment has the same refrigeration cycle, multi-blade fan 6a,
6b, in addition to the rotational speed control means, the start and stop timings of the electric motors of the two (plural) multi-blade fans 6a and 6b, the electric motor of the compressor 3 and the electric motor of the machine room cooling fan 4 are changed respectively. It is provided with a start / stop control means for controlling. That is, the refrigerator-freezer of the present embodiment circulates the air cooled by the heat exchange with the evaporator 5 in the refrigeration cycle for circulating the refrigerant, and cools the inside of the heat insulating box 1 (two or more). The multi-blade fans 6a and 6b arranged in parallel are operated by changing the respective rotation speeds, and the electric motors of the two (plural) multi-blade fans 6a and 6b, the electric motor of the compressor 3, and the machine room cooling fan 4 The electric motor is operated by changing the start and stop timings of the electric motor.

Therefore, similarly to the first embodiment, the roaring noise caused by the interference during the operation of the two (plural) multi-blade fans 6a and 6b for cooling the inside of the refrigerator can be reduced, and therefore the first embodiment can be reduced. The same effect can be achieved, and moreover, abrupt changes in sound at the time of starting and stopping can be prevented, so that the bodily sensation level can be lowered and the user is not made uncomfortable.

<Third Embodiment> FIG. 4 is a time chart showing the operating states of the electric motors of the refrigerator / freezer according to the third embodiment of the present invention, showing the start and stop timings of the electric motors. As shown in FIG. 4, the start order of the two multi-blade fans 6a and 6b is changed every time the compressor 3 is started, and the stop order is also changed. That is, during the first operation, the multi-blade fan 6
a, the multi-blade fan 6b, the machine room cooling fan 4, and the compressor 3 are started in this order and stopped in the reverse order. Then, during the second operation, the multi-blade fan 6b, the multi-blade fan 6a, the machine room cooling fan 4, and the compressor 3 are started in this order,
Stop in the reverse order. This makes it possible to average the operating time of the electric motors of the two multi-blade fans 6a and 6b.

At this time, the flow of the air flow 7 also changes. This will be described with reference to FIGS. 5 is a sectional view showing a front upper part of a refrigerator-freezer according to a third embodiment of the present invention, and FIG. 6 is a sectional view showing a front upper part of a refrigerator-freezer according to a third embodiment of the present invention. That is, during the first operation, the airflow 7 flowing through the evaporator 5 in the initial operation (only the multi-blade fan 6a operates) flows as shown in FIG. 5, and during the second operation, the initial operation (the multi-blade fan 6b) is performed. The air flow 7 flowing in the evaporator 5 (only operated) flows as shown in FIG. As a result, it is possible to prevent the frost formation on the evaporator 5 at the initial stage of operation from being ubiquitous.

As described above, the refrigerator / freezer of this embodiment has the same refrigeration cycle, multi-blade fans 6a and 6b, rotation speed control means, and second embodiment as those of the first and second embodiments. In addition to the start-stop control means, a start-stop order control means is provided that operates by changing the start order and stop order of the two (plural) multiblade fans 6 each time the compressor 3 is started.

That is, the refrigerating refrigerator of this embodiment circulates the air cooled by heat exchange with the evaporator 5 in the refrigerating cycle for circulating the refrigerant, and cools the inside of the heat insulating box 1 by two (Multiple) multi-blade fans 6a, 6 arranged in parallel
The rotation speed of b is changed, and the start and stop timings of the electric motors of the two (plural) multi-blade fans 6a and 6b, the electric motor of the compressor 3, and the electric motor of the machine room cooling fan 4 are respectively changed. The operation is changed, and the start order and stop order of the two (plural) multi-blade fans 6a and 6b are changed each time the compressor 3 is started.

Therefore, like the first and second embodiments, two (plural) multi-blade fans 6 for cooling the inside of the refrigerator are installed.
Not only can the barking noise caused by the interference during the operation of a and 6b be reduced, but also the abrupt change of the sound at the time of starting and stopping can be prevented, so that the same effect as the first and second embodiments can be obtained. Moreover, two (plural) multi-blade fans 6a,
Since the operation time of 6b can be averaged, each multi-blade fan 6
The life of the motors a and 6b can be averaged. Furthermore, since the direction of the air flow 7 passing through the evaporator 5 changes immediately after startup, it is possible to prevent an extreme deviation of the frosted state on the evaporator 5 and obtain a relatively uniform frosted state. Therefore, it is possible to improve the resistance to the deterioration of the capacity of the evaporator 5 due to frost formation (that is, the frost resistance of the evaporator 5).

<Fourth Embodiment> In the first to third embodiments described above, a refrigerator-freezer in which two multi-blade fans 6a and 6b for cooling the inside of the refrigerator are closely arranged laterally will be described. However, the same effect can be obtained by arranging three, or three or more, multi-blade fans 6 laterally and using them in parallel.

FIG. 7 is a sectional view showing a front upper part of a refrigerator-freezer according to a fourth embodiment of the present invention, and FIG. 8 is a sectional view showing a front upper part of another refrigerator-freezer according to a fourth embodiment of the present invention. Yes, both are equipped with a multi-blade fan 6 for cooling the interior and the evaporator 5
Shows an air flow 7 passing through. In the figure, the same reference numerals and symbols as those of the above-mentioned respective embodiments indicate the same or corresponding constituent parts as those of the above-mentioned respective embodiments.

As shown in the figure, when the number of the multi-blade fans 6 for cooling the inside of the refrigerator increases, the multi-blade fans 6 can be widely distributed and arranged on the upper surface of the evaporator 5, so that the air flow 7 becomes the evaporator 5. Even on the upper side of, the flow is uniform and parallel without being concentrated in one fan suction direction. Therefore, the airflow 7 passes through the entire evaporator 5 to perform heat exchange, so that the efficiency of heat exchange of the evaporator 5 is improved.

<Fifth Embodiment> In the above first to fourth embodiments, two or more multi-blade fans 6, 6a, 6b for cooling the inside of the refrigerator are arranged in the same direction. Although the freezer-refrigerator described above has been described, the multi-blade fan 6 may be arranged by appropriately changing the axial direction. FIG. 9 is a sectional view showing a front upper portion of a refrigerator-freezer according to a fifth embodiment of the present invention, and FIG. 10 is a plane sectional view showing the refrigerator-freezer of FIG.
In the figure, the same reference numerals and symbols as those of the above-mentioned respective embodiments indicate the same or corresponding constituent parts as those of the above-mentioned respective embodiments.

As shown in the figure, if the axial direction of each multiblade fan 6 is changed to the outside, the direction of the air flow 7 introduced into the inside of the refrigerator can be changed. For example, as shown in FIG. 10, even with the heat insulating box 1 that is wide in the width direction of the evaporator 5, the cooling air can be sent to the vicinity of the wall surface where the heat leakage is relatively large, so that the temperature distribution in the refrigerator can be improved. It can be maintained in a uniform and good state.

[0034]

As described above, the refrigerating refrigerator according to the invention of claim 1 comprises a refrigerating cycle, a multi-blade fan, and a rotation speed control means, and an evaporator in the refrigerating cycle for circulating the refrigerant. By circulating the air cooled by heat exchange to cool the inside of the heat-insulating box and operating the multi-blade fans arranged in parallel at different rotational speeds, a plurality of inside-cooling fans are cooled. The roaring noise caused by the interference during the operation of the multi-blade fan can be reduced, so that the overall noise can be suppressed and the refrigerator / refrigerator becomes quiet.

A refrigerating refrigerator according to a second aspect of the present invention comprises a refrigeration cycle, a multi-blade fan, a rotation speed control means, and a start / stop control means, and heat exchange with an evaporator in a refrigeration cycle for circulating a refrigerant. A plurality of multi-blade fans are operated by changing the rotation speed of each of the multi-blade fans arranged in parallel to circulate the air cooled by the cooling machine to cool the inside of the heat-insulating box, and to operate the motor and compressor. By operating by changing the start and stop timings of the electric motor of the motor and the fan for cooling the machine room, it is possible to reduce the growl noise caused by the interference during the operation of the multiple blade fans for cooling the inside of the refrigerator. Not only the noise can be suppressed, but also abrupt changes in the sound at the time of starting and stopping can be prevented, so that the bodily sensation level can be lowered and the user is not uncomfortable.

A refrigerating refrigerator according to a third aspect of the present invention comprises a refrigeration cycle, a multi-blade fan, a rotation speed control means, a start / stop control means, and a start / stop sequence control means, and is provided in a refrigeration cycle for circulating a refrigerant. The air cooled by heat exchange with the evaporator is circulated to cool the inside of the heat-insulating box, and the number of rotations of the multi-blade fans arranged in parallel is changed while operating. The multi-blade fan electric motor, the compressor electric motor, and the machine room cooling fan electric motor are operated by changing the start and stop timings of each, and the start and stop order of a plurality of multi-blade fans is changed every time the compressor is started. By operating by changing each, it is possible to reduce the roaring noise caused by interference during operation of multiple multi-blade fans for cooling the inside of the refrigerator,
Not only can the overall noise be suppressed, but also abrupt changes in sound during startup and shutdown can be prevented, so that the sensory sound level can be lowered, and the user is not uncomfortable.
Since the operating time of multiple multi-blade fans can be averaged, the life of the electric motor of each multi-blade fan can be averaged, and moreover, the direction of the air flow passing through the evaporator immediately after startup can be changed at each startup. Since it changes, it is possible to prevent an extreme deviation of the frosting state on the evaporator and improve the frosting resistance of the evaporator.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a refrigerator-freezer according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an upper front part of the refrigerator-freezer of FIG.

FIG. 3 is a time chart showing an operating state of each electric motor of the refrigerator-freezer according to the second embodiment of the present invention.

FIG. 4 is a time chart showing the operating state of each electric motor of the refrigerator-freezer according to the third embodiment of the present invention.

FIG. 5 is a sectional view showing a front upper part of a refrigerator-freezer according to a third embodiment of the present invention.

FIG. 6 is a sectional view showing an upper front part of a refrigerator-freezer according to a third embodiment of the present invention.

FIG. 7 is a sectional view showing a front upper portion of a refrigerator-freezer according to a fourth embodiment of the present invention.

FIG. 8 is a sectional view showing an upper front portion of another refrigerator-freezer according to the fourth embodiment of the present invention.

FIG. 9 is a sectional view showing a front upper part of a refrigerator-freezer according to a fifth embodiment of the present invention.

10 is a plan sectional view showing the refrigerator-freezer of FIG.

FIG. 11 is a side sectional view showing a conventional refrigerator-freezer.

FIG. 12 is a cross-sectional view showing an upper front portion of the refrigerator-freezer of FIG. 11.

FIG. 13 is a time chart showing an operating state of each electric motor of the conventional refrigerator-freezer.

[Explanation of symbols]

 1 Insulation Box 2 Machine Room 3 Compressor 4 Machine Room Cooling Fan 5 Evaporator 6 Multiblade Fan 6a Multiblade Fan 6b Multiblade Fan 7 Air Flow

Claims (3)

[Claims] 1. A refrigerating cycle for circulating a refrigerant having a compressor, a condenser, a decompressor, and an evaporator, and an interior of a heat-insulating box for circulating air cooled by heat exchange with the evaporator. A refrigerating refrigerator, comprising: a plurality of multi-blade fans arranged in parallel for cooling a plurality of fans; and a rotation speed control unit that operates by changing the rotation speeds of the plurality of multi-blade fans. 2. A refrigeration cycle for circulating a refrigerant, which has a compressor, a condenser, a pressure reducer, and an evaporator, and circulates the air cooled by heat exchange with the evaporator, and is an inside of a storage box made of a heat insulating box. A plurality of multi-blade fans arranged in parallel to cool the plurality of multi-blade fans, rotation speed control means for operating by changing the rotation speed of each of the plurality of multi-blade fans, an electric motor of the plurality of multi-blade fans, a motor of a compressor, A freezer-refrigerator, comprising: a start-stop control unit that operates by changing start and stop timings of an electric motor of a machine room cooling fan. 3. A refrigeration cycle for circulating a refrigerant having a compressor, a condenser, a decompressor, and an evaporator, and an air cooled by the heat exchange with the evaporator to circulate the inside of a storage box made of a heat-insulating box. A plurality of multi-blade fans arranged in parallel to cool the plurality of multi-blade fans, rotation speed control means for operating by changing the rotation speed of each of the plurality of multi-blade fans, an electric motor of the plurality of multi-blade fans, a motor of a compressor, A start / stop control unit that operates by changing the start and stop timings of the electric motor of the machine room cooling fan, and a start that operates by changing the start order and stop order of the plurality of multiblade fans each time the compressor is started. A freezer-refrigerator, comprising: stop order control means.