WO2013014857A1

WO2013014857A1 - Refrigerator

Info

Publication number: WO2013014857A1
Application number: PCT/JP2012/004123
Authority: WO
Inventors: 平井　剛樹; 境　寿和; 上迫　豊志
Original assignee: パナソニック株式会社
Priority date: 2011-07-22
Filing date: 2012-06-26
Publication date: 2013-01-31
Also published as: EP2735827B1; CN103717987A; JP5899407B2; CN103717987B; EP2735827A1; JP2013024492A; EP2735827A4

Abstract

A refrigerator (10), provided with: a heat-insulated box (51) having a storage compartment in a heat-insulated compartment; a door for closing off the storage compartment; and a compressor (80). The door is configured such that the natural frequency per unit time of the door is lower than the lowest frequency of operation of the compressor (80). This makes it possible to prevent resonance of the door even when, for example, the operating frequency of the compressor (80) is switched by the inverter control, or where storage items are stored in the door. Also, vibration of the door is suppressed and resonance can be prevented with respect to vibration of the compressor (80) without the addition of an anti-vibration member.

Description

refrigerator

The present invention relates to a structure of a refrigerator, in particular, a heat insulating box and a door of the refrigerator.

In recent years, refrigerators have been saving energy from the viewpoint of protecting the global environment, and further improved usability and storage are required.

For example, in order to improve the storage capacity of the storage chamber disposed at the bottom, there is a method of providing a recess in the back of the uppermost storage chamber of the heat insulation box and storing the components of the refrigeration cycle in the recess. (For example, see Patent Document 1).

FIG. 7 is a cross-sectional view showing the structure of a conventional refrigerator 180 as seen from the side.

The refrigerator 180 includes an outer box 102 that forms an outer wall of the heat insulating box 101, an inner box 103 that forms an inner wall of the heat insulating box 101, and a urethane heat insulating material that is foam-filled between the outer box 102 and the inner box 103. 104.

The refrigerator 180 has a refrigerating room 105, a freezing room 106, and a vegetable room 107 in order from the top, and a refrigerating room rotary door 108 is provided at the front opening of the refrigerating room 105.

In addition, the freezer compartment 106 and the vegetable compartment 107 located below the center portion of the heat insulation box 101 are a drawer type freezer compartment drawer door 109 and a vegetable that can be easily taken out in consideration of storability and convenience. A room drawer door 112 is provided.

The heat insulation box 101 is provided with a recess 120. The concave portion 120 is provided by denting the top rear portion from the upper surface 121 of the outer box to the rear surface 122 of the outer case so that the rear portion of the refrigerator compartment 105 is lowered.

The front and rear of the recess 120 are closed by the left and right walls of the heat insulating box 101, but open upward and backward. An open portion of the recess 120 is covered with a recess cover 125 including an upper plate 123 and a back plate 124 configured substantially at right angles to the upper plate 123. The recess cover 125 is detachably fixed to the heat insulating box 101 with screws or the like.

Compressor 131 and condenser 132 constitute a refrigeration cycle. The compressor 131 and the condenser 132 are disposed together with the machine room fan 133 so as to be accommodated in the recess 120, and are covered with the recess cover 125. The upper plate 123 and the back plate 124 of the recess cover 125 are provided with a plurality of ventilation holes 134 for heat dissipation.

Further, the evaporator 135 which is a device constituting the refrigeration cycle is disposed along with the cooling fan 136 at the back of the freezer compartment 106.

With this configuration, the vegetable room 107 which is the lowest storage room is configured to be deeper than the other storage rooms.

That is, according to the above-described configuration, the compressor 131 and the condenser 132 are accommodated in the upper part of the back surface of the heat insulating box 101. Thereby, compared with the case where the compressor 131 and the condenser 132 are accommodated in the back lower part of the heat insulation box 101, the internal volume of the vegetable compartment 107 can be enlarged and comprised deeply. In addition, even if the high-pressure device is arranged on the upper side of the heat insulation box 101, the weight of the storage in the vegetable room 107 which is the lowest storage room is increased, thereby lowering the center of gravity of the whole heat insulation box 101 and stabilizing. Can be achieved.

However, in such a conventional configuration, the compressor 131 which is one of the vibration generation sources of the refrigerator 180 is provided at the top of the heat insulating box. Accordingly, there is a problem that the refrigerating room rotary door 108 which is the top door with the highest use frequency is likely to vibrate due to the vibration of the compressor 131.

Conventionally, even when the compressor 131 is provided in the lower part of the heat insulating box 101, the uppermost door arranged at the top is higher than the other doors, so that there is a problem that it is easily shaken. is there. Compared with the configuration in which the compressor 131 is disposed in the lower part of the heat insulating box 101, when the compressor 131 is disposed in the upper part of the heat insulating box 101, the vibration of the refrigerating room rotary door 108 can be more noticeable. There is sex.

Here, it is assumed that the power consumption of the refrigerator 180 is reduced by using inverter control that controls operation by switching the operation frequency of the compressor 131 to a plurality of levels. In such a case, if the minimum frequency of the compressor 131 is made lower than the frequency of the household power supply, for example, 50 Hz, the operating frequency of the compressor 131 is the same as the natural frequency per unit time of the refrigerator compartment rotary door 108. In this case, the refrigerating room rotary door 108 is likely to resonate.

Furthermore, when the stored item can be accommodated in the refrigerator compartment 105 side of the refrigerator compartment rotating door 108, the natural frequency of the refrigerator compartment rotating door 108 including the stored item is lowered according to the weight of the article to be stored. Therefore, the possibility of occurrence of resonance increases.

JP 2001-99552 A

The present invention has been made in view of such problems, and a refrigerator capable of suppressing vibration and preventing resonance without adding a vibration isolation member or the like to the vibration of the compressor. It is to provide.

The refrigerator of the present invention includes a heat insulating box having a storage room partitioned by heat insulation, a door for closing the storage room, and a compressor. And the door is comprised so that the natural frequency per unit time may become lower than the lowest frequency which drives a compressor.

As a result, the natural frequency per unit time of the door that closes the storage room is lower than the lowest frequency at which the compressor is operated. For example, the operation frequency of the compressor is switched by inverter control, or the stored item is stored in the door. The door can be prevented from resonating even when it is done.

Therefore, according to the refrigerator of the present invention, the vibration of the door can be suppressed and the resonance can be prevented without adding a vibration isolating member to the vibration of the compressor.

FIG. 1 is a front view of the refrigerator in the first embodiment of the present invention. FIG. 2 is a cross-sectional view seen from the side, showing the internal structure of the refrigerator in the first embodiment of the present invention. FIG. 3 is an exploded perspective view of the heat insulating box of the refrigerator in the first embodiment of the present invention. FIG. 4 is a front view of the refrigerator in the second embodiment of the present invention. FIG. 5: is sectional drawing seen from the side which shows the internal structure of the refrigerator in the 2nd Embodiment of this invention. FIG. 6 is an exploded perspective view of the heat insulating box of the refrigerator in the second embodiment of the present invention. FIG. 7 is a cross-sectional view showing the structure of a conventional refrigerator as seen from the side.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to these embodiments.

(First embodiment)
FIG. 1 is a front view of the refrigerator 10 according to the first embodiment of the present invention, FIG. 2 is a side sectional view showing the internal structure of the refrigerator 10, and FIG. 3 is an exploded perspective view of a heat insulating box 51 of the refrigerator 10. FIG.

The refrigerator 10 includes a heat insulating box 51 having a storage room partitioned by heat insulation, a door for closing the storage room, and a compressor 80. Further, the door is configured such that the natural frequency per unit time is lower than the lowest frequency at which the compressor 80 is operated.

The refrigerator 10 includes a heat insulation box 51 in the refrigerator main body 50.

The heat insulating box 51 is formed by filling an inner box 52 formed of resin, an outer box 53 formed of a metal magnetic material such as a steel plate, and a heat insulating material 54 between the inner box 52 and the outer box 53. It has a heat insulating wall.

The heat insulation box 51 has a front opening 51a. The partition wall 55 forms a refrigerator compartment 56, a freezer compartment 57, and a plurality of heat-insulated storage compartments in order from the top.

Further, the refrigerator compartment 56 is cooled and held in the refrigerator temperature zone, and the freezer compartment 57 is kept in the refrigerator temperature zone.

As shown in FIG. 3, the inner box 52 includes an upper inner box 52a and a lower inner box 52b. The upper inner box 52a integrally forms the upper, lower, left and right surfaces and the inner surface in the refrigerator compartment 56, has a front surface opened, and has a substantially box shape. In addition, the lower inner box 52b integrally forms the upper, lower, left, and right surfaces and the rear surface of the freezer compartment 57, has a front surface opened, and has a substantially box shape.

As shown in FIG. 2, the partition wall 55 includes a lower surface of the upper inner box 52a, an upper surface of the lower inner box 52b, and a partition plate 55a. The partition plate 55a is provided on the front surface of the partition wall 55, and is formed of a metal magnetic material such as a steel plate. In the internal space of the partition wall 55, the heat insulating material 54 of the heat insulating box 51 is integrally foamed and filled.

The partition plate 55a is provided at the same position as the forefront of the outer box 53 in the front-rear direction of the heat insulating box 51, and forms a part of the front opening 51a.

The refrigerator compartment 56 and the freezer compartment 57 are respectively provided with a refrigerator compartment door 56a and a freezer compartment door 57a (storage compartment door) that close the front opening 51a when fully closed.

As shown in FIG. 1, the refrigerator door 56 a and the freezer door 57 a are insulated by the upper hinge 60, the middle hinge 61, and the lower hinge 62, each having a rotation axis at the right upper and lower ends when viewed from the front. The box body 51 is rotatably connected.

The upper hinge 60 is attached to the upper end of the heat insulation box 51, the lower hinge 62 is attached to the lower end of the heat insulation box 51, and the middle hinge 61 is attached to the partition plate 55a.

As shown in FIG. 2, each storage room door is attached so that the surface on the side of the heat insulation box 51 has a space 63 of about 5 mm in the front-rear direction with the front opening 51 a when fully closed. Yes. In the space 63, gaskets 64 having magnets are arranged on the four sides of the upper and lower sides and the left and right sides of the surface of each storage room door on the heat insulating box 51 side. Since the gasket 64 can be adsorbed and adhered to the front opening 51a by the magnetic force of the gasket 64, each storage chamber can be sealed in a substantially sealed state.

The gasket 64 is a hollow elastic member made of a soft material such as rubber. Therefore, even if the distance in the front-rear direction of the space 63 slightly varies, each storage chamber can be sealed and held by the expansion and contraction of the gasket 64 and the adsorption holding force by the magnet.

As shown in FIG. 1, in the present embodiment, the size of the refrigerator compartment door 56 a and the freezer compartment door 57 a is the same in the width direction of the heat insulating box 51. However, in the height direction of the heat insulating box 51, the opening height of the refrigerator compartment 56 is configured to be higher than the opening height of the freezer compartment 57. That is, the area of the refrigerator compartment door 56a which is the uppermost door is larger than the area of the freezer compartment door 57a.

As shown in FIG. 2, the refrigerator compartment door 56a and the freezer compartment door 57a are heat insulating walls filled with a heat insulating material. Although the freezer compartment door 57a is thicker than the refrigerator compartment door 56a, the refrigerator compartment door 56a is configured to be heavier than the freezer compartment door 57a.

A plurality of door shelves that can store stored items are provided on the surface of the refrigerator compartment door 56a on the refrigerator compartment 56 side. Specifically, from the top, a small shelf 70 for storing small items such as seasonings, a beverage shelf 71 for storing beverage cans, and a bottle shelf for storing large beverages such as plastic bottles. 72 are arranged so as to have an appropriate interval in the vertical direction.

Further, the natural frequency per unit time including the door shelf of the refrigerator compartment door 56a (hereinafter also simply referred to as the natural frequency) is configured to be 33 Hz.

On the other hand, in the present embodiment, the freezer compartment door 57a does not have a door shelf, and the natural frequency of the freezer compartment door 57a is configured to be 40 Hz.

The heat insulation box 51 has a refrigeration cycle that cools and holds each storage chamber at a predetermined temperature, and the compressor 80 forms a part of the refrigeration cycle.

Compressor 80 is a reciprocating compressor that compresses refrigerant by reciprocating a piston in a cylinder. As the refrigerant of the refrigeration cycle including the compressor 80, a hydrocarbon-based refrigerant, for example, isobutane can be used.

The compressor 80 is operated with inverter control for switching the operation frequency of the compressor 80 to a plurality of levels by the control unit 90 in order to reduce the power consumption of the refrigerator main body 50. The control unit 90 controls the operation of the compressor 80.

In the present embodiment, the lowest frequency for operating the compressor 80 is 35 Hz, which is lower than the frequency (50 Hz) of the household power supply.

The compressor 80 and the control unit 90 are disposed in the machine room 100. The machine room 100 is provided in the lower recess 51 b on the lower back side of the heat insulating box 51. Moreover, as shown in FIG. 1, the compressor 80 is arrange | positioned in the left-right direction in the front view of the heat insulation box 51 on the same side as the side in which the hinge of each storeroom door was provided (example of FIG. 1). However, the present invention is not limited to this example as long as the compressor 80 and the hinge are provided on the same side.

About the refrigerator 10 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

First, when the user inputs the household power supply of the refrigerator main body 50, the high-temperature and high-pressure refrigerant discharged by the compression operation of the compressor 80 circulates in the refrigeration cycle, and passes through each storage chamber to a predetermined set temperature range. Keep cooled.

At this time, the control unit 90 performs control to switch from a plurality of levels so that the operating frequency of the compressor 80 becomes an optimum value according to the situation of each storage room. Moreover, the control part 90 controls the driving | operation of the compressor 80 so that the electric power consumption of the refrigerator main body 50 becomes low.

For example, when the temperature of the storage chamber is considerably higher than a predetermined temperature, such as when the user first inputs a household power supply or when many stored items are stored in the storage chamber at a time, the control unit 90 Operates the compressor 80 at the maximum frequency. Thereafter, the temperature in the storage chamber gradually decreases, and the control unit 90 switches the operating frequency of the compressor 80 to a low level, and finally operates at the lowest operating frequency of 35 Hz.

The user can open and close the refrigerator compartment door 56a to freely put in and out the items stored in each door shelf. When the amount of stored items stored in the door shelf increases, the natural frequency of the entire refrigerator compartment door 56a continuously changes in a lower direction. Conversely, when the amount of stored items stored in the door shelf decreases, the natural frequency of the entire refrigerator compartment door 56a continuously changes in a higher direction. However, since the natural frequency in the state where the stored item is not accommodated in the door shelf is 33 Hz, the natural frequency of the entire refrigerator compartment door 56a does not reach 35 Hz which is the lowest frequency of the compressor 80.

On the other hand, since the freezer compartment door 57a is lighter in weight than the refrigerator compartment door 56a, the natural frequency is larger than that of the refrigerator compartment door 56a. In the present embodiment, the natural frequency of the freezer compartment door 57 a is 40 Hz, which is higher than 35 Hz, which is the lowest frequency of the compressor 80. Moreover, since the freezer compartment door 57a is not provided with a door shelf, the natural frequency of the whole freezer compartment door 57a does not change, and the freezer compartment door 57a is not operated unless the control unit 90 operates the compressor 80 at 40 Hz. This resonance does not occur.

In addition, when providing the shelf shelf also in the freezer compartment door 57a, the natural frequency of the freezer compartment door 57a when the amount of stored goods is the maximum is measured, and the door of the freezer compartment door 57a is determined from the frequency. The compressor 80 is not operated within the range up to 40 Hz, which is the natural frequency when the stored items are not accommodated in the shelf. Thereby, it is possible not to generate resonance in the freezer compartment door 57a.

In the present embodiment, the minimum frequency during operation of the compressor 80 is set to 35 Hz. However, the present invention is not limited to this example. The power consumption of the refrigerator main body 50 can be reduced by further reducing the operating frequency of the compressor 80.

That is, if the variation range of the weight of the refrigerator compartment door 56a can be narrowed, the lowest frequency during operation of the compressor 80 can be set to 34 Hz. Furthermore, if the weight of the refrigerator compartment door 56a can be increased by increasing the size of the refrigerator compartment door 56a, the natural frequency of the refrigerator compartment door 56a can be lowered. Accordingly, the minimum frequency during operation of the compressor 80 can be further reduced.

Moreover, in the refrigerator 10 of the present embodiment, since the partition wall 55 and the inner box 52 are integrally formed, the gap between the partition wall 55 and the heat insulation box 51 can be completely eliminated. If there is a gap between the partition wall 55 and the heat insulation box 51, when the heat insulation box 51 is vibrated by the compressor 80 or the like, vibration is generated in a minute gap and a chatter noise is generated. There is. However, in the configuration of the refrigerator 10 of the present embodiment, there is no possibility that the chatter noise will occur.

Furthermore, the fact that there is a gap between the partition wall 55 and the heat insulation box 51 also means that the heat insulation box 51 is easily deformed. In particular, as in the refrigerator 10 of the present embodiment, when a door shelf is provided on the refrigerator compartment door 56a arranged at the uppermost position, not only the deformation of the heat insulating box 51 immediately after production but also the user However, it is necessary to consider the deformation when storing supplies in the door shelf.

In the present embodiment, the partition wall 55 and the inner box 52 are integrally formed, and the heat insulating material 54 in the partition wall 55 and the heat insulating material 54 of the heat insulating box 51 are integrally foam-filled. . Thereby, the rigidity of the heat insulation box 51 is increased, so that vibration propagation to the refrigerator compartment door 56a is suppressed, and strength durability against storage of stored items in the door shelf of the refrigerator compartment door 56a can be obtained.

In the present embodiment, the inner box 52 is divided into the upper inner box 52a and the lower inner box 52b, so that the rigidity of the heat insulating box 51 may be reduced. However, the upper inner box 52a, the lower inner box 52b, and the heat insulating material 54 are brought into close contact with each other, so that a configuration that does not lower the rigidity is possible.

Also, it is necessary to consider reducing the minute gaps for the same reason in the open / close mechanism of the refrigerator compartment door 56a and the seal structure.

First, as for the opening / closing mechanism, there is a drawer type door in addition to the rotary type. In general, the drawer type often has a minute gap between the heat insulating box 51 and the refrigerator compartment door 56a. On the other hand, if it is a rotation type, since each hinge and the refrigerator compartment door 56a can be connected almost without gap, it is desirable. Furthermore, since the refrigerator door 56a which is the uppermost door is most frequently used, it is more convenient for the user to use a rotary type.

Further, in the present embodiment, the compressor 80 is arranged on the same side as the side where the hinge of the refrigerator compartment door 56a is provided in the left-right direction in the front view of the heat insulating box 51. Thereby, since the vibration of the compressor 80 propagates from the hinge side of the refrigerator compartment door 56a to the refrigerator compartment door 56a, the oscillation of the refrigerator compartment door 56a can be suppressed.

Next, regarding the seal structure, it is necessary to seal and hold the space 63 in a substantially hermetically sealed state while absorbing manufacturing variations and the shrinkage of the heat insulating box 51 and each storage chamber door during cooling. For this reason, it is desirable to use an elastic member as the gasket 64. By using the elastic member, vibration propagation from the heat insulating box 51 to each storage room door can be suppressed at the same time.

As described above, in the refrigerator 10 of the present embodiment, there is no seam between the partition wall 55 and the inner box 52, and a minute gap at the connection portion between the components can be eliminated. Vibration generation of the heat insulating box 51 due to vibration can be suppressed.

Further, by integrally forming the heat insulating material 54 in the heat insulating box 51 and the heat insulating material 54 of the partition wall 55, the rigidity of the heat insulating box 51 is increased and vibration propagation of the compressor 80 can be suppressed. .

Furthermore, since the natural frequency per unit time of the refrigerator door 56a which is the uppermost door provided at the uppermost part is lower than the lowest frequency at which the compressor 80 is operated, the operating frequency of the compressor 80 can be switched by inverter control. Even when stored items are accommodated in the door shelves, the refrigerator compartment door 56a can be prevented from resonating.

In addition, since the weight of the refrigerator compartment door 56a which is the uppermost door is configured to be heavier than the weight of the freezer compartment door 57a, the natural frequency of the uppermost door can be easily lowered.

In the present embodiment, the upper and lower ends of the right side of the refrigerator compartment door 56a are configured to be pivotably opened and closed by the upper hinge 60 and the middle hinge 61, and the lower middle hinge 61 is configured as a partition wall. 55 is fixed. With this configuration, compared to the case where the refrigerator compartment door 56a is configured to be freely drawn out, the gap between the connection portions of the heat insulation box 51 and the refrigerator compartment door 56a can be set narrow, so that vibration is generated at the connection portion. Can be suppressed.

Further, since the space 63 between the refrigerator compartment door 56a and the heat insulation box 51 is sealed by the gasket 64 which is an elastic member, vibration propagation from the insulation box 51 to the refrigerator compartment door 56a can be suppressed, and the refrigerator compartment door 56a. Can be suppressed.

(Second Embodiment)
Next, the refrigerator 20 in the 2nd Embodiment of this invention is demonstrated.

4 is a front view of the refrigerator 20 according to the second embodiment of the present invention, FIG. 5 is a cross-sectional view of the internal structure of the refrigerator 20 as seen from the side, and FIG. 3 is an exploded perspective view of a heat insulating box 201 of the refrigerator 20. FIG.

Compared with the refrigerator 10 described in the first embodiment, the refrigerator 20 according to the present embodiment stores three storage chambers and the compressor 230 in the upper back side of the heat insulating box 201. Is different.

The refrigerator 20 includes a heat insulation box 201 in the refrigerator body 200.

The heat insulating box 201 is formed by filling an inner box 202 formed of resin, an outer box 203 formed of a metal magnetic material such as a steel plate, and a heat insulating material 204 between the inner box 202 and the outer box 203. It has a heat insulating wall.

The heat insulation box 201 has a front opening 201a. The upper partition wall 205 and the lower partition wall 206 form a refrigerator compartment 207, a vegetable compartment 208, a freezer compartment 209, and a plurality of heat-insulated storage compartments in order from the top.

Further, the refrigerator compartment 207 and the vegetable compartment 208 are kept cooled in the refrigerator temperature zone, and the freezer compartment 209 is kept in the refrigerator temperature zone.

As shown in FIG. 6, the inner box 202 has a substantially box shape in which the upper, lower, left, and right surfaces and the inner surface of each storage chamber are integrally formed and the front surface is opened, and the upper inner box 202a, The inner inner box 202b and the lower inner box 202c are configured.

As shown in FIG. 5, the upper partition wall 205 includes a lower surface of the upper inner box 202a, an upper surface of the middle inner box 202b, and an upper partition plate 205a. The upper partition plate 205a is provided on the front surface of the upper partition wall 205 and is formed of a metal magnetic material such as a steel plate.

The lower partition wall 206 includes a lower surface of the inner inner box 202b, an upper surface of the lower inner box 202c, and a lower partition plate 206a. The lower partition plate 206a is provided on the front surface of the lower partition wall 206, and is formed of a metal magnetic material such as a steel plate.

In the internal spaces of the upper partition wall 205 and the lower partition wall 206, the heat insulating material 204 of the heat insulating box 201 is integrally foam-filled.

The upper partition plate 205a and the lower partition plate 206a are provided at the same position as the forefront surface of the outer box 203 in the front-rear direction of the heat insulation box 201, and form a part of the front opening 201a.

As shown in FIG. 4, the refrigerator compartment 207 is provided with a refrigerator compartment right door 207a and a refrigerator compartment left door 207b that close the front opening 201a when fully closed.

The vegetable compartment 208 is provided with a vegetable compartment door 208a that closes the front opening 201a when fully closed, and the freezer compartment 209 is provided with a freezer compartment door 209a that closes the front opening 201a when fully closed. Yes.

The refrigerator compartment right door 207a and the refrigerator compartment left door 207b are arranged at the same height in the height direction of the heat insulation box 201, and are divided on the left side of the center in the left-right direction in the front view of the heat insulation box 201. Has been. Therefore, the area of the refrigerator compartment right door 207a is larger than the area of the refrigerator compartment left door 207b.

The refrigerator compartment right door 207a, the vegetable compartment door 208a, and the freezer compartment door 209a are insulative boxes by upper and lower hinges 210, a middle right hinge 211, a middle hinge 212, and a lower hinge 213 in order from the upper and lower ends of the right side. The body 201 is rotatably connected to the body 201.

Further, the left and right upper and lower ends of the refrigerator compartment left door 207b are rotatably connected to the heat insulating box 201 by an upper left hinge 214 and a middle left hinge 215.

The upper right hinge 210 and the upper left hinge 214 are attached to the upper end of the heat insulation box 201, and the lower hinge 213 is attached to the lower end of the heat insulation box 201, respectively. The middle right hinge 211 and the middle left hinge 215 are attached to the upper partition plate 205a, and the middle hinge 212 is attached to the lower partition plate 206a.

As shown in FIG. 5, each storage chamber door is attached such that the surface on the side of the heat insulation box 201 has a space 216 of about 5 mm in the front-rear direction with the front opening 201 a when fully closed. . In the space 216, gaskets 217 having magnets are arranged on the four sides of the upper and lower sides and the left and right sides of the surface of each storage compartment door on the heat insulation box 201 side. Since the gasket 217 can be adsorbed and brought into close contact with the front opening 201a by the magnetic force of the gasket 217, each storage chamber can be sealed in a substantially sealed state.

The gasket 217 is a hollow elastic member made of a soft material such as rubber. Therefore, even if the distance in the front-rear direction of the space 216 slightly varies, each storage chamber can be sealed and held by the expansion and contraction of the gasket 217 and the adsorption holding force by the magnet.

As shown in FIG. 4, in the present embodiment, when the refrigerator main body 200 is viewed from the front, the area of the refrigerator compartment right door 207a is the largest among the storage compartment doors.

As shown in FIG. 5, each storage room door is a heat insulating wall filled with a heat insulating material. Inside the heat insulating wall of the refrigerator door right door 207a, a vacuum heat insulating material 207c having a specific gravity larger than that of the heat insulating material of the other storage room door and having a low thermal conductivity is disposed. The right door 207a is configured to be the heaviest.

A plurality of door shelves that can store stored items are provided on the surface of the refrigerator compartment right door 207a on the refrigerator compartment 207 side. Specifically, in order from the top, a small shelf 220 for storing small items such as seasonings, a beverage shelf 221 for storing beverage cans, and a bottle shelf for storing large beverages such as plastic bottles. 222 are arranged at appropriate intervals in the vertical direction.

In addition, the width of each door shelf of the present embodiment in the left-right direction in the front view of the heat insulating box 201 is smaller than each door shelf of the refrigerator 10 described in the first embodiment. It is configured.

Further, the natural frequency including the door shelf of the refrigerator compartment right door 207a is configured to be 33 Hz.

In the present embodiment, each of the other storage room doors of the refrigerator compartment right door 207a does not have a door shelf, and the natural frequency of each storage room door is 40 to 45 Hz.

The heat insulating box 201 has a refrigeration cycle that cools and holds each storage chamber at a predetermined temperature, and the compressor 230 forms a part of the refrigeration cycle.

Compressor 230 is a reciprocating compressor that compresses refrigerant by reciprocating a piston in a cylinder. As the refrigerant of the refrigeration cycle including the compressor 230, a hydrocarbon-based refrigerant, for example, isobutane can be used.

The compressor 230 is operated by inverter control for switching the operation frequency of the compressor 230 to a plurality of levels by the control unit 240 in order to reduce the power consumption of the refrigerator main body 200. The control unit 240 controls the operation of the compressor 230.

In the present embodiment, the minimum frequency for operating the compressor 230 is 35 Hz, which is lower than the frequency of the household power supply (for example, 50 Hz).

The compressor 230 and the control unit 240 are arranged in a machine room 250 provided in an upper recess 201b on the upper back side of the heat insulating box 201. Moreover, the compressor 230 is arrange | positioned at the refrigerator compartment right door 207a side (right side) in the left-right direction in the front view of the heat insulation box 201. FIG.

The operation and action of the refrigerator 20 configured as described above will be described below.

First, when a user inputs household power to the refrigerator body 200, the high-temperature and high-pressure refrigerant discharged by the compression operation of the compressor 230 circulates in the refrigeration cycle, and passes through each storage chamber to a predetermined set temperature range. Keep cooled.

At this time, the control unit 240 performs control to switch from a plurality of levels so that the operating frequency of the compressor 230 becomes an optimum value according to the situation of each storage room. Moreover, the control part 240 controls the compressor 230 so that the power consumption of the refrigerator main body 200 becomes low.

For example, when the temperature in the storage room is considerably higher than a predetermined temperature, such as when the user first inputs a household power supply or when many stored items are stored in the storage room at a time, the control unit 240 operates the compressor 230 at the maximum frequency. Thereafter, the temperature in the storage chamber gradually decreases, and the control unit 240 switches the operating frequency of the compressor 230 to a low level, and finally operates at the lowest operating frequency of 35 Hz.

The user can open and close the refrigerator door right door 207a and freely put in and out the items stored in each door shelf. When the amount of stored items stored in the door shelf increases, the natural frequency of the entire refrigerator compartment right door 207a continuously changes in a lower direction. Conversely, when the amount of stored items stored in the door shelf decreases, the natural frequency of the entire refrigerator compartment right door 207a continuously changes in a higher direction. However, since the natural frequency in the state where the stored item is not accommodated in the door shelf is 33 Hz, the natural frequency of the entire refrigerator compartment right door 207a does not reach 35 Hz which is the lowest frequency of the compressor 230.

On the other hand, since the other storage room doors are lighter in weight than the refrigeration room right door 207a, the natural frequency is larger than that of the refrigeration room right door 207a. In the present embodiment, the natural frequency of the other storage room door is set to 40 to 45 Hz which is larger than 35 Hz which is the lowest frequency of the compressor 230. Since the other storage room door is not provided with a door shelf, the natural frequency of the other storage room door does not change. Therefore, as long as the control unit 240 does not operate the compressor 230 at 40 to 45 Hz, resonance of other storage room doors does not occur. In other words, the control unit 240 operates the compressor 230 at an operation frequency excluding the natural frequency per unit time of the other storage room doors.

In addition, when providing door shelves in other storage room doors, measure the natural frequency per unit time of each storage room door when the storage capacity of the storage item is maximum, and from the frequency, The compressor 230 is not operated within the range of 40 to 45 Hz, which is the natural frequency when not stored in the door shelf of each storage room door. Thereby, it is possible not to generate resonance of other storage room doors.

In the present embodiment, the minimum frequency during operation of the compressor 230 is 35 Hz. However, the present invention is not limited to this example. Lowering the operating frequency of the compressor 230 can reduce the power consumption of the refrigerator body 200.

For example, if the range of variation in the weight of the refrigerator compartment right door 207a can be narrowed, the minimum frequency during operation of the compressor 230 can be set to 34 Hz. Furthermore, if the weight can be increased by enlarging the refrigerator compartment right door 207a, the natural frequency of the refrigerator compartment right door 207a can be lowered. Accordingly, the minimum frequency during operation of the compressor 230 can be lowered. In the present embodiment, by using the vacuum heat insulating material 207c, the weight of the refrigerator compartment right door 207a is increased and the natural frequency of the refrigerator compartment right door 207a is lowered.

Furthermore, in this embodiment, the area of the refrigerator door right door 207a is the largest. Thereby, when using the vacuum heat insulating material 207c whose heat conductivity is smaller than the heat insulating material of the other storage room door, compared with the case of applying to the other storage room door, by applying to the refrigerator compartment right door 207a The amount of heat penetration into the heat insulating box 201 can be reduced most. If the amount of heat intrusion into the heat insulating box 201 is reduced, the time ratio of operating the compressor 230 at the lowest frequency increases. Therefore, reducing the natural frequency of the refrigerator compartment right door 207a is a consumption of the refrigerator main body 200. It contributes very effectively to the reduction of electric energy.

Further, in the refrigerator 20 of the present embodiment, the upper partition wall 205, the lower partition wall 206, and the inner box 202 are integrally formed. Therefore, the upper partition wall 205, the lower partition wall 206, and the heat insulating box 201 The gap between can be completely abolished. If there is a gap between the upper partition wall 205 and the lower partition wall 206 and the inner box 202, when the heat insulating box 201 is vibrated from the compressor 230 or the like, vibration occurs in a minute gap portion, A chatter noise may occur. However, in the configuration of the refrigerator 20 of the present embodiment, there is no possibility that the chatter noise will occur.

Furthermore, the fact that there is a gap between the upper partition wall 205 and the lower partition wall 206 and the inner box 202 also means that the heat insulating box 201 is easily deformed.

In particular, as in the refrigerator 20 of the present embodiment, when the door shelf is provided in the refrigerator door right door 207a that is the uppermost door disposed at the uppermost position, only the deformation immediately after the production of the heat insulating box 201 is performed. In addition, it is necessary to consider the deformation when the user stores the stored item in the door shelf.

In the present embodiment, the upper partition wall 205 and the inner box 202 are integrally formed, and the heat insulating material 204 in the upper partition wall 205 and the heat insulating material 204 of the heat insulating box 201 are integrally foam-filled. Yes. As a result, the rigidity of the heat insulating box 201 is increased, so that not only vibration transmission to the refrigerator compartment right door 207a is suppressed, but also strength durability against storage of stored items in the door shelf of the refrigerator compartment right door 207a is obtained. be able to.

In the present embodiment, the inner box 202 is divided into an upper inner box 202a, a middle inner box 202b, and a lower inner box 202c, so that the rigidity of the heat insulating box 201 may be reduced. Can be considered. However, it is possible to have a configuration in which the rigidity is not lowered by bringing the respective inner boxes and the heat insulating material 204 into close contact with each other.

If the vibration and rigidity levels are acceptable, the lower partition wall 206 may be formed of a member different from the inner box 202. In this case, the number of the inner boxes 202 is reduced (the inner inner box 202b and the lower inner box 202c can be formed by one inner box), so that the factory productivity is improved and the lower partition wall 206 of the heat insulating material 204 is filled with the foam. Generation | occurrence | production of the defect which leaks from a part can be suppressed.

It should be noted that the above-described minute gap needs to be reduced for the same reason in the open / close mechanism of the refrigerator compartment right door 207a and the seal structure.

First, as for the opening / closing mechanism, there is a drawer type door in addition to the rotary type. Generally, the drawer type door has a minute gap between the heat insulating box 201 and the refrigerator door right door 207a. There are many cases. On the other hand, if it is a rotation type, since each hinge and the refrigerator compartment right door 207a can be connected almost without gap, it is desirable. Furthermore, since the refrigerator door right door 207a and the refrigerator door left door 207b, which are the uppermost doors at the top, are frequently used, it is more convenient for the user to use the rotary type.

For the vegetable compartment door 208a and the freezer compartment door 209a, if there is no problem of vibration, the drawer type may be more convenient depending on the size of the heat insulating box 201.

In the present embodiment, the compressor 230 is disposed on the right side of the refrigerator compartment right door 207a in the left-right direction in the front view of the heat insulating box 201 (FIG. 4). Thereby, since the vibration of the compressor 230 is preferentially propagated to the refrigerating room right door 207a side, vibration at the refrigerating room left door 207b, which is lighter than the refrigerating room right door 207a, can be suppressed. In addition, this invention is not limited to this example, The compressor 230 should just be arrange | positioned at the heavier door side in the left-right direction in the front view of the heat insulation box 201. FIG.

Next, with respect to the seal structure, it is necessary to seal and hold the space 216 in a substantially hermetically sealed state while absorbing manufacturing variations and shrinkage of the heat insulating box 201 and each storage chamber door during cooling. For this reason, it is desirable to use an elastic member as the gasket 217. By using the elastic member, vibration propagation from the heat insulation box 201 to each storage room door can be suppressed at the same time.

Moreover, in this Embodiment, since the compressor 230 is arrange | positioned in the upper back side of the heat insulation box 201, compared with the refrigerator 10 of 1st Embodiment, a lower storage room, for example, a vegetable room The depth 208 can be wide. On the other hand, in the refrigerator 20, the depth on the upper back side of the refrigerator compartment 207 is narrowed. However, since this portion is a space that is difficult for the user to reach and is unusable, the usability of the user is not deteriorated.

As described above, in the refrigerator 20 of the present embodiment, there is no seam between the upper partition wall 205 and the inner box 202, and a minute gap at the connection portion between the parts can be eliminated. Vibration generation of the heat insulating box 201 can be suppressed.

Further, by integrally forming the heat insulating material 204 in the heat insulating box 201 and the heat insulating material 204 of the upper partition wall 205, the rigidity of the heat insulating box 201 is increased and the vibration propagation of the compressor 230 can be suppressed. it can.

Furthermore, the natural frequency per unit time of the refrigerator door right door 207a which is the uppermost door provided at the uppermost part is lower than the lowest frequency at which the compressor 230 is operated. Thereby, even if it is a case where the operating frequency of the compressor 230 is switched by inverter control, or stored goods are accommodated in each door shelf, it can prevent that the refrigerator compartment right door 207a resonates.

Moreover, by disposing the compressor 230 on the upper back side of the heat insulating box 201, the depth of the vegetable room 208 which is a lower storage room can be provided widely.

Moreover, the natural frequency of the door on the side where the compressor 230 is arranged can be easily lowered by configuring the refrigerator door right door 207a to be heavier than the other storage compartment doors. it can.

Further, in the present embodiment, the upper and lower ends of the right side in the front view of the refrigerating room right door 207a are configured to be openable and closable by the upper right hinge 210 and the middle right hinge 211, and the lower middle right A hinge 211 is fixed to the upper partition wall 205. With this configuration, compared with the case where the refrigerator compartment right door 207a is configured to be freely drawn out, the gap between the connecting portion between the heat insulating box 201 and the refrigerator compartment right door 207a can be set narrow, and vibration is generated at the connecting portion. Can be suppressed.

Further, since the space 216 between the refrigerator compartment right door 207a and the heat insulation box 201 is sealed by the gasket 217, which is an elastic member, vibration propagation from the insulation box 201 to the refrigerator compartment right door 207a can be suppressed. The vibration of the refrigerator compartment right door 207a which is a door can be suppressed.

Further, the storage room door of the refrigerating room 207, which is the top door, is divided into a left side door 207a and a left side door 207b in the left-right direction in the front view of the heat insulating box 201, and the heavier freezer right door 207a. The compressor 230 is arranged on the side. Thereby, the vibration of the compressor 230 is preferentially propagated to the heavier refrigeration room right door 207a, which is difficult to transmit the vibration, so that the vibration of the lighter refrigeration room left door 207b can be suppressed.

In addition, in each embodiment, although demonstrated using the example in which the heat insulation box body was heat-insulated by the some storage chamber, the refrigerator of this invention is not limited to this example. For example, the present invention can be applied to a refrigerator including a heat insulating box having only one storage room that is insulated. In this case, the same resonance preventing effect can be obtained by setting the natural frequency per unit time of the door that closes the storage chamber to be lower than the lowest frequency for operating the compressor.

In addition, for a refrigerator including a heat insulation box having a plurality of storage rooms, the natural frequency per unit time of the door that closes the storage room is also set to be lower than the lowest frequency at which the compressor is operated for doors other than the top door. By keeping it low, the same resonance preventing effect can be obtained.

In each of the embodiments, the

compressors

80 and 230 are arranged on the lower back side or the upper back side of the

heat insulating boxes

51 and 201, but the present invention is not limited to these examples. Whatever the position of the

compressors

80 and 230 in the

heat insulating boxes

51 and 201, the natural frequency per unit time of the door that closes the storage room is set to the lowest frequency at which the

compressors

80 and 230 are operated. By making it lower than this, the same resonance preventing effect can be obtained.

Further, in each embodiment, at least the uppermost partition wall and the inner box arranged at the top are integrally formed, and the heat insulating material in the uppermost partition wall and the heat insulating material of the heat insulating box are integrally foam-filled. However, the present invention is not limited to this example. For example, even when the partition wall and the inner box are not formed integrally, the resonance of the door can be made by satisfying the relationship between the natural frequency of the door and the minimum operating frequency of the compressor. It becomes possible to prevent.

As described above, according to the present invention, it is possible to suppress vibration of the door and prevent resonance without adding a vibration isolation member or the like to the vibration of the compressor, without increasing the cost and the assembly process. Can do. Therefore, the present invention is applicable not only to refrigerators but also to other freezers, greenhouses, and the like, and is useful.

10,20 Refrigerator 50,200 Refrigerator main body 51,201

Heat insulation box

51a, 201a Front opening 51b Lower recess 52,202

Inner box

52a, 202a Upper

inner box

52b, 202c Lower inner box 53,203 Outer box 54,204 Material 55 Partition wall

55a Partition plate

56, 207 Refrigeration room 56a

Refrigeration room door

57, 209

Freezing room

57a, 209a Freezing room door 60

Upper hinge

61, 212

Middle hinge

62, 213

Lower hinge

63, 216

Space

64, 217

Gasket

70, 220 Small shelf 71,221 Beverage shelf 72,222 Bottle shelf 80,230 Compressor 90,240 Control unit 100,250 Machine room 201b Upper recess 202b Middle inner box 205 Upper partition wall 205a Upper partition plate 206 Lower partition wall 206a Lower partition Board 207a Refrigeration room right door 207b Refrigeration room left door 207c Vacuum insulation 208 Vegetable room 208a Vegetable room door 210 Upper right hinge 211 Middle right hinge 214 Upper left hinge 215 Middle left hinge

Claims

An insulation box having a storage compartment partitioned by heat insulation;
A door closing the storage room;
With a compressor,
The said door is a refrigerator comprised so that the natural frequency per unit time may become lower than the lowest frequency which drives the said compressor.
A partition wall that thermally insulates the heat insulation box into a plurality of the storage chambers in the vertical direction;
A plurality of the doors closing each of the plurality of storage chambers;
2. The refrigerator according to claim 1, wherein a natural frequency per unit time of an uppermost door that closes the storage chamber disposed at the top among the plurality of doors is lower than a lowest frequency at which the compressor is operated. .
A plurality of the partition walls are provided;
The heat insulating box is configured by foam filling a heat insulating material between the outer box and the inner box,
At least, among the plurality of partition walls, the uppermost partition wall disposed at the top and the inner box are integrally formed,
The refrigerator according to claim 2, wherein the heat insulating material in the uppermost partition wall and the heat insulating material in the heat insulating box are integrally foam-filled.
The refrigerator of Claim 2 or Claim 3 which has arrange | positioned the said compressor in the upper back side of the said heat insulation box.
The refrigerator according to claim 2 or 3, wherein the uppermost door is configured to be heavier than other doors.
The uppermost door is configured such that the upper and lower portions of either one of the left and right ends in front view can be freely opened and closed with a pair of hinges,
The refrigerator according to claim 2 or 3, wherein a lower hinge of the pair of hinges is fixed to the uppermost partition wall.
The refrigerator according to claim 2 or 3, further comprising an elastic member that seals a space between the uppermost door and the heat insulating box.
The uppermost door is divided into a left door and a right door in the left-right direction in the front view of the heat insulation box,
The refrigerator according to claim 2 or 3, wherein the compressor is disposed so as to be closer to a heavier door of the left door and the right door.
A control unit for controlling the operation of the compressor;
The refrigerator according to claim 5, wherein the control unit operates the compressor at an operation frequency excluding the natural frequency per unit time of the other door.