WO2006041146A1

WO2006041146A1 - Refrigerator

Info

Publication number: WO2006041146A1
Application number: PCT/JP2005/018918
Authority: WO
Inventors: Ichiro Kita
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2004-10-14
Filing date: 2005-10-14
Publication date: 2006-04-20
Also published as: JP2006183988A; TWI341378B; TW200624740A

Abstract

A refrigerator with a compressor installed in a recess in a top surface of the refrigerator. The refrigerator has a box body (1) where a storage chamber having a door on its front side is provided. The compressor (11) is placed in the recess (27) that is recessed along the top surface (23) and a back surface (28a) of the box body (1), toward the uppermost receiving space (29a) side in the storage chamber. An inverter-driven electric motor operated at different rotation speeds including higher frequencies than at least a commercial power supply frequency is used for the electric power element of the compressor (11), and this makes the top of the compressor (11) lower than the top surface (23). Further, a permanent magnet is used for a rotor to reduce the height of the compressor (11). Receiving ability in the upper part of the chamber is enhanced and also appearance is improved.

Description

Specification

Refrigerator

Technical field

[0001] The present invention relates to a refrigerator in which a compressor is mounted on the top surface of the refrigerator.

Background art

Hereinafter, a conventional refrigerator will be described with reference to the drawings.

[0003] Conventional refrigerators generally have a machine room disposed behind the lower part of the refrigerator body, and a high-pressure side component of a refrigeration cycle such as a compressor is accommodated in the machine room. In recent years, refrigerators have been required to improve ease of use and space-saving viewpoints. From the viewpoint of the global environment, energy savings are also required. In order to respond to this request, a method of using a machine room !, inadequate! 1).

FIG. 15 shows a configuration of a conventional refrigerator described in Document 1.

[0005] Refrigerator box body 1 has a refrigeration room 2, a vegetable room 3, and a freezer room 4 from the top. Refrigerating room 2 has refrigerating room rotating door 5, and vegetable room 3 is a vegetable room drawer door. 6. Freezer room 4 has a freezer drawer door 7.

[0006] And, the cooling unit 10 having the equal force of the internal fan 8 and the evaporator 9 is refrigerated with a height substantially the same as the height of the opening of the freezing chamber 4 that forms a storage section as the lowermost storage chamber. Installed at the rear rear of chamber 4. The compressor 11 is installed in a recess 12 that is recessed to the refrigerator compartment 2 side over the top surface 11a and the back surface 1 lb of the box body 1 of the conventional refrigerator.

[0007] The refrigerator compartment 2 is provided with a plurality of shelves 12b for storing food and the like. In the uppermost storage space 12c and the second storage space 12d divided by the uppermost shelf 12b, the concave portion 12 provided on the upper back of the box body 1 travels as a convex portion 12e toward the refrigerator. Yes.

[0008] In the refrigerator having such a configuration, the compressor 11 is moved to the upper rear side from the lower stage of the refrigerator main body, so that the freezer compartment 4 and the vegetable compartment 3 are raised by the storage volume of the compressor 11. It can be lowered. Therefore, the position of the partition wall that divides the refrigerator compartment 2 and the vegetable compartment 3 can be lowered, and the stored items in the vegetable compartment 3 can be easily taken out.

[0009] However, in the conventional configuration described above, even if the storage property of the lower stage of the refrigerator is improved, the convex portion 12e formed in the upper corner portion of the refrigerator may not be visually attractive or the storage property may be reduced. It's easy to do. Therefore, in order to make the convex part 12e as small as possible, it is necessary to make the concave part 12 low, and there is a problem that the height of the compressor 11, which is the maximum factor that determines the height of the concave part 12, must be reduced. .

[0010] Further, in order to reduce the height of the recess 12 in which the compressor 11 is installed as much as possible, a horizontal rotary compressor having a rotary compressor mechanism is effective in terms of the type and form of the compressor 11. It can be a means.

[0011] However, rotary compressors generally have a mechanical part directly fixed to the inner surface of the compressor shell, which is a container, in order to achieve downsizing, and vibration during operation tends to propagate to the outside. . In addition, in a refrigerator of the type in which a compressor that is likely to transmit vibration to the refrigerator box body 1 is placed at the top, the position of the compressor 11 is particularly user-friendly compared to a conventional refrigerator with a compressor installed at the bottom. Close to the ear. For these reasons, the user tends to feel uncomfortable the resonance sound due to the vibration of the compressor 11 and vibration transmission. Therefore, it is not easy to achieve both usability and appearance quality improvement by reducing the compressor installation space, and low vibration and noise.

[0012] In addition, there is a problem of improving the usability of the refrigerator by making effective use of the top surface 11a of the refrigerator with poor storage properties for purposes other than storage, without reducing the substantial storage capacity. It was.

[0013] That is, with the transfer of the compressor, in order to improve the storage capacity of food and the like, the internal volume in the warehouse occupying the external volume determined by the external dimensions of the box body 1 should be as large as possible. It was also a problem related to.

[0014] On the other hand, in the upper corner portion of the refrigerator, if the protrusion to the interior by the recess 12 protrudes downward from the shelf bottom of the uppermost storage space 12c, it is at a position near the eye level of the user. For this reason, it was preferable in terms of the appearance design in the cabinet.

[0015] Further, when food or the like is stored by hand in the second storage space, it is located on the back side from the height of the frontage. However, when the food is taken out from the back side, there is a problem that it cannot be pulled out by force.

[0016] Furthermore, as a problem in terms of cooling performance, it is necessary to efficiently cool the compressor 11 installed in the recess 12 across the top surface 11a and the back surface ib.

Disclosure of the invention

[0017] The refrigerator of the present invention has a box body in which a storage room having a door on the front surface is disposed, and a recess that is recessed toward the uppermost storage space in the storage room over the top and back surfaces of the box body. And a compressor in which an electric element having a stator and a rotor force and a compression element driven by the electric element are housed in a closed container, and the top of the compressor is a box body. The height of the compressor is reduced by using an inverter-driven electric motor that operates at multiple rotational speeds as the electric element of the compressor and using a permanent magnet for the rotor of the electric element so that it is lower than the top surface of the compressor. Has been.

[0018] This improves the storage property of the lower stage of the refrigerator and reduces the protrusion (projection) of the recess to the storage space side in the storage space to improve the appearance and substantially improve the appearance. Without violating the effective space, the storage space in the warehouse can be widened and the storage performance can be greatly improved.

[0019] According to the present invention, it is easy to use by increasing the internal volume of the lower part of the refrigerator, and harmonizes with the internal structure that reduces the bulge inside the storage space of the compressor placed in the upper part of the refrigerator. It is possible to provide a refrigerator that has a good appearance and a high storage capacity.

Brief Description of Drawings

FIG. 1 is a schematic sectional view of a refrigerator according to Embodiment 1 of the present invention.

FIG. 2 is a schematic rear view of the refrigerator according to the first embodiment of the present invention.

FIG. 3 is a schematic component development view of the refrigerator according to the first embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of the refrigerator compressor according to the first embodiment of the present invention.

FIG. 5 is a horizontal sectional view of the refrigerator compressor according to the first embodiment of the present invention.

FIG. 6 is a comparison diagram of the induction motor and the inverter motor of the compressor of the refrigerator according to the first embodiment of the present invention.

[Fig. 7] Fig. 7 is a plan view of a salient pole concentration rod stator of the refrigerator compressor according to the first embodiment of the present invention. FIG.

FIG. 8 is a perspective view of a leg portion of the compressor according to the first embodiment of the present invention.

FIG. 9A is a schematic cross-sectional view of the refrigerator in the second embodiment of the present invention.

[Fig. 9B] Fig. 9B is a cross-sectional view of a principal part of the refrigerator in the second embodiment of the present invention.

圆 10] Fig. 10 is a schematic sectional view of the compressor of the refrigerator in Embodiment 3 of the present invention. 圆 11] Fig. 11 is a schematic sectional view of the compressor of the refrigerator in Embodiment 3 of the present invention. 圆 12 FIG. 12 is a schematic cross-sectional view of the refrigerator compressor in Embodiment 4 of the present invention. A 13A] FIG. 13A is a schematic perspective view of the sealed container of the refrigerator compressor in Embodiment 4 of the present invention. .

[FIG. 13B] FIG. 13B is a plan view of the refrigerator compressor according to the fourth embodiment of the present invention as viewed from the lower surface of the sealed container.

14] FIG. 14 is a schematic cross-sectional view of a sealed container of the compressor of the refrigerator in the fourth embodiment of the present invention.

FIG. 15 is a schematic sectional view of a conventional refrigerator.

Explanation of symbols

1 Box body

2 Cold room

3 Vegetable room

4 Freezer room

5 Refrigerating room revolving door

6 Vegetable room drawer door

7 Freezer compartment door

8 Inside fan

9 Evaporator

11 Compressor Outer case

a door

b Storage room

Switching room

Ice making room

Gasket Switching room drawer door Ice making room drawer door 屝 Pocket Storage shelf

, 200 top

Outer shell panel Bottom panel Back panel Recessed part

Machine room panel a Rear

Top shelf a Top storage bin Second shelf a Second shelf storage b Convex

c Indoor side bottom wall d Shelf bottom

Discharge piping b, 203 Top Heat exchanger

U-turn part

1 Lower container

2 Upper container

3, 403 Airtight container 4 Refrigerant

5 Refrigerator oil

6 legs

6b Adhering surface

6c Bend

6d Elastic member arrangement lower surface 6e Jib

7, 270 Elastic member 8 pin

9 holes

Electric element

1, 240 Rotor 1a Rotor recess 2 Stator

3, 209 Compression element a Support part

b Bottom edge

Spring terminator lead wire

Discharge tube Suction tube 122 Sealing tube

130, 210 shaft

131, 210b Main shaft

132, 210a Eccentric part

134, 231 Compression chamber

135 Bearing

136, 232 piston

137 Connection means

140 Inhalation muffler

141 Suction port

142 Cylinder head

143 Discharge muffler

144 Discharge pipe

150 Body

151 Mizuhisa Magnet

152 holes

153 End plate

154 Force pin

161 Stator core

162

171 Salient pole

172 communication line

180 Stator

181 Stator core

182 Rotor

183

201 Ventilation duct

202 Bottom 209 compression element

210 shaft

210a Eccentric part

210b spindle

210c countershaft

220 Main bearing

221 Sub bearing

230 Connecting member

231 Compression chamber

232 piston

240 rotor

250 airtight container

251 Upper container

252 Lower container

260 legs

270 Elastic member

280 Compressor installation surface

281 Dimple

290 Bottom

406 legs

410 Cobb

410a leg edge

410b Support bump

411 Recessed bump

413 Support member

420 Connection part

456 legs

456a 1¾ side BEST MODE FOR CARRYING OUT THE INVENTION

[0022] The refrigerator of the present invention has a box body in which a storage room having a door on the front surface is disposed, and a recess that is recessed toward the uppermost storage space in the storage room over the top and back surfaces of the box body. And a compressor in which an electric element having a stator and a rotor force and a compression element driven by the electric element are housed in a closed container, and the top of the compressor is a box body. To reduce the height of the compressor, use an inverter-driven motor that operates at multiple speeds as the electric element of the compressor, and use a permanent magnet for the rotor of the electric element to reduce the height of the compressor Is done.

[0023] This makes it possible to guarantee the refrigerating capacity at high load by varying the frequency and to compact the cylinder volume of the compression element. In addition, the use of an inverter motor that uses permanent magnets eliminates the need for exciting currents necessary for generating rotational torque, thereby reducing the thickness of the stator and rotor. As a result, the height of the compressor can be reduced by reducing the height of the compression element and electric element of the compressor. Since the height of the concave part where the compressor is installed can be reduced, the storage capacity of the lower part of the refrigerator is improved, and the protrusion (convex part) of the concave part toward the storage space in the warehouse is reduced, so that the appearance is improved. The storage space in the cabinet is widened and storage is greatly improved.

In the refrigerator of the present invention, the ventilation duct communicating with the recess is provided so as to be the top surface of the box body, and the top of the compressor is higher than the lower surface of the ventilation duct that is lower than the top surface of the box body. It's okay. As a result, the overhang of the compressor housing part to the inside of the warehouse is reduced, and the interior space can be used more effectively. Moreover, the height of the compressor may be set within the height of the recess including the height of the ventilation duct. Even in the case of large refrigerators, etc. that incorporate downsizing factors, it is possible to expand the degree of design freedom even when a compressor with a relatively large refrigeration capacity must be adopted. In addition, since the top of the compressor is arranged in the projection plane in the ventilation direction of the ventilation duct, the top of the compressor having the highest temperature is efficiently cooled, and the characteristics and reliability of the compressor are improved. At the same time, the ventilation ducts necessary for cooling the compressor etc. are easily reachable, because they are placed on the top surface that is inconvenient to use. improves.

[0025] In the refrigerator of the present invention, the electric element of the compressor is a stator core constituting a stator. It is also possible to use a salient pole concentration type in which a plurality of salient pole parts are wound with a wire through an insulator. The shoreline does not cross between the distant slots, and is concentrated and wound tightly on each salient pole, so that the shoreline does not rise due to the shoreline crossing between the slots. As a result, the height of the electric element of the compressor can be further reduced, the overall height of the compressor can be further reduced, and the height of the recess in which the compressor is installed can be reduced. In addition to improving the storage capacity of the lower part of the refrigerator, the protrusion (projection) on the side of the storage space in the storage area of the refrigerator is small and the appearance is improved, so that the storage space in the storage area is widened and storage capacity is greatly improved. Can be improved.

In the refrigerator of the present invention, the permanent magnet housed in the rotor may be a rare earth permanent magnet. Rare earth magnets have a magnetic flux density that is about four times greater than that of commonly used ferrite magnets, so that even if the magnet height is lowered, the same or higher magnetic flux can be obtained. As a result, the height of the electric element of the compressor can be further reduced, the overall height of the compressor can be further reduced, and the height of the recess in which the compressor is installed can be lowered. Storability is improved. Furthermore, the protrusion (projection) of the recessed portion toward the storage space in the storage space can be reduced to improve the appearance, the storage space in the storage space can be widened, and storage performance can be greatly improved.

[0027] In the refrigerator of the present invention, the shelf bottom of the uppermost storage space and the indoor side bottom wall surface of the recess may be substantially the same horizontal plane. The compressor can also be stored in the predetermined recess in a state in which the shelf in the uppermost storage space and the bottom wall surface on the indoor side of the compressor storage recess are connected substantially continuously in appearance. In addition, when storing or taking out food, etc., in the second storage space from the top of the refrigerator, the height of the frontage is the same as far as it goes, so food can not be caught on the way. This makes it easier to take in and out and improves usability.

[0028] In the refrigerator of the present invention, the height of the uppermost storage space may be set to a height at which a 350 ml can beverage standard product can be set and stored. As a result, the compressor can be installed at the rear of the uppermost part and bite into the inside of the warehouse, but it can be harmonized in appearance with the uppermost storage space. In other words, because it is usually unusable, it is relatively free to use as a storage space, and the use space, especially in the uppermost space, is behind the compressor housing recess, making it a relatively easy to use front space. Once in the food to be stored Cans can be stored side by side in a vertical direction. The total number of storages in the refrigeration room increases, and the top storage space can be used effectively.

[0029] In the refrigerator of the present invention, the height of the top surface of the box body from the floor surface may be 1800 mm or less. As a result, considering the ease of use in the cabinet so that women with standard Japanese height can easily use it, and by compacting the height of the compressor 11 within this height range as much as possible, The effective space inside the warehouse can be prevented from being compromised, and the storage efficiency can be maximized.

[0030] In the refrigerator of the present invention, a compressor that is a reciprocating type including a compression element that is elastically supported with respect to the sealed container and includes a compression chamber and a piston that reciprocates in the compression chamber may be mounted. Yes. Conventionally, reciprocating compressors are easier to reduce the vibration of the compressor than horizontal rotary compressors, etc., but because of the large height of the structure, the compressor is located on the top of the compressor. There were application restrictions. According to one aspect of the present invention, even a reciprocating compressor can reduce the overall height of the compressor, and can reduce vibration, which is a major problem when the compressor is disposed at the top. It becomes. As a result, even with a compressor-top-fridge where there is a concern that vibrations may be transmitted to the refrigerator body, the height of the recess where the compressor is installed can be reduced while removing the user's discomfort, so that the lower part of the refrigerator can be stored.ヽ Refrigerator can be provided for improved usability.

[0031] In the refrigerator of the present invention, the compression element includes a shaft having a main shaft portion and an eccentric portion, a rotor provided in the main shaft portion, and a bearing portion that pivotally supports the main shaft portion. The compression element side may have a rotor recess, and the bearing portion may extend into the rotor recess. In reciprocating compressors, securing the bearing length to support the shaft was one of the major challenges in reducing the height. According to one aspect of the present invention, a machine including an electric element and a compression element can be obtained by overlapping the electric element and the compression element on the projection surface in the height direction without reducing the length of the main bearing. The overall height of the compressor can be greatly reduced, and the height of the compressor can be further reduced without reducing the reliability of the compressor.

[0032] In the refrigerator of the present invention, the compression element has a main shaft portion, a sub shaft portion, a main bearing that pivotally supports the main shaft portion, and a sub bearing that pivotally supports the sub shaft portion, with the eccentric portion interposed therebetween. It may be a thing Yes. In one embodiment of the present invention, the piston serving as the vibration source can be supported on both sides by providing the main bearing and the sub-bearing on both sides of the eccentric portion including the piston that performs the reciprocating motion. This prevents shaft deflection and improves the reliability of the sliding surface of the shaft. Since the reliability of the compressor can be ensured even if the sliding length of the main bearing is shorter than before, the height of the compressor can be further reduced without reducing the reliability of the compressor. It is out.

[0033] In the refrigerator of the present invention, the compression element has a main shaft portion, a sub shaft portion, a main bearing that supports the main shaft portion, and a sub bearing that supports the sub shaft portion coaxially with the rotor interposed therebetween. Even so. In one embodiment of the present invention, a main bearing and a secondary bearing are provided on both sides of a rotor fixed to a shaft that performs reciprocating motion. This prevents shaft deflection and improves the reliability of the sliding surface of the shaft, thus ensuring the reliability of the compressor even if the sliding length of the main bearing is shorter than before. Can do. As a result, the height of the compressor can be further reduced without reducing the reliability of the compressor.

[0034] In the refrigerator of the present invention, the compressor is an internal low-pressure type, and the electric element is disposed below the sealed container and is elastically supported to the sealed container via a support member. In addition, the compression element may be disposed via the high-pressure pipe which is disposed on the upper part of the electric element and has a shape force capable of elastic support with respect to the sealed container. According to one aspect of the present invention, the distance from the elastic support portion can be further increased as compared with the case where the compression element is directly elastically supported, and the vibration generated in the compression element has high rigidity. The vibration of the compressor can be reduced because the elastic support force of the compressor is transmitted to the outside of the compressor after being attenuated when passing through the child. For this reason, even if the compressor is located close to the user's ear, the compressor is located in the upper part of the compressor, while reducing the height of the recess where the compressor is installed while eliminating the user's discomfort. An easy-to-use refrigerator with improved storability can be provided. In addition, since the high-pressure piping of the compression element has a shape force that can be elastically supported, the vibration of the compression element is further attenuated by the high-pressure piping and transmitted to the outside of the compressor. Can be reduced. Here, inertial support means, for example, support by an elastic member.

5o [0035] In the refrigerator of the present invention, the sealed container includes an upper container and a lower container, and the plurality of legs fixed to the lower container are installed in the recesses via elastic members, the legs, the elastic members, This contact surface may be arranged above the lowermost part of the compressor, and the height of the elastic member may be made larger than the distance between the installation surface to the concave part of the compressor and the lowermost part of the compressor. This is a protrusion in the refrigerator compartment, impairing design and storage, reducing the height of the recess for storing the compressor, and effective elasticity to reduce the vibration transmission of the compressor force Since the vibration can be further damped by increasing the height of the member, it is possible to provide a high-quality refrigerator by reducing unpleasant vibration and generation of noise caused by the vibration.

[0036] In the refrigerator of the present invention, the mechanical unit including the electric element and the compression element of the compressor is elastically supported through the support member in the hermetic container, and the vertical center of gravity of the compressor and the compressor The distance between the leg and the contact surface of the elastic member may be shorter than the distance between the vertical center of gravity of the compressor and the lower end surface of the support member. The vibration amplitude of the compressor tends to increase as it moves away from the center of gravity where the vicinity of the center of gravity is the smallest, and the entire compressor vibrates around the center of gravity. Therefore, the vibration transmission to the refrigerator can be further reduced by reducing the vibration amplitude of the contact surface between the leg and the elastic member closer to the center of gravity than the vibration of the lower surface of the support member that supports the machine part. Therefore, it is possible to provide a high-quality refrigerator that does not generate unpleasant vibration or noise caused by vibration.

[0037] In the refrigerator of the present invention, the mechanical part composed of the electric element and the compression element of the compressor is elastically supported through the support member in the hermetic container, and the contact between the leg of the compressor and the elastic member. The contact surface may be located above the lower end surface of the support member. The vibration of the compressor is transmitted downward through the support member from the mechanical part which is a vibration generation source, and then the direction changes upward and is transmitted to the elastic member through the leg part. Since the vibration transmission path becomes complicated, the vibration is further damped in the transmission path. In addition, since the distance to the contact surface between the leg of the compressor and the elastic member can be increased, vibration transmission in a particularly high frequency region is attenuated, and the contact surface between the leg and the elastic member is reduced. The amplitude of vibration is reduced. Furthermore, vibration transmission to the refrigerator can be reduced, and a high-quality refrigerator free from unpleasant vibration and noise caused by vibration can be provided.

[0038] In the refrigerator of the present invention, the legs rise upward from the fixing surface that is fixed to the sealed container. You may have a bending part and the elastic member arrangement | positioning lower surface which latches an elastic member. By forming the bent part by simple bending of the leg, the leg is positioned on the fixed surface of the lower part of the closed container with good workability such as joining, and the surface on which the elastic member is placed is closer to the center of gravity, and the elastic member is placed It can be on the bottom surface and is very easy to manufacture. Further, the formation of the bent portion makes it possible to increase the distance from the surface where the leg is fixed to the closed container to the lower surface of the elastic member arrangement where the elastic member is arranged. Since the distance of vibration transmission with a fixed surface force becomes long, transmission in a particularly high frequency region is attenuated, and vibration transmission to the refrigerator can be further reduced. Therefore, manufacture is easy and vibration transmission to the refrigerator can be reduced, and a high-quality refrigerator free from unpleasant vibration and noise generation due to vibration can be provided at low cost.

[0039] In the refrigerator of the present invention, the legs may be provided with ribs that extend over at least two places of the fixing surface, the bent portion, and the lower surface of the elastic member. The rigidity of the leg can be increased and the eigenvalue of the leg itself increases. In addition, since the legs themselves vibrate, it is possible to further reduce vibration transmission from the fixed surface of the sealed container to the lower surface of the elastic member arrangement of the legs, and further to the elastic members and the refrigerator main body. In addition, the rib can be formed by a press that is easy to manufacture, and the strength of the leg is increased. Therefore, another problem that the leg is deformed by the transport impact of the refrigerator can be improved. Therefore, it is easy to manufacture and vibration transmission to the refrigerator can be reduced, and a high-quality refrigerator free from unpleasant vibration and noise caused by vibration can be provided at low cost.

[0040] In the refrigerator of the present invention, the sealed container includes an upper container and a lower container, and the plurality of legs fixed to the lower container are installed in the recess through the elastic member, and the compressor is installed in the recess A compressor is mounted so that the height of the elastic member is larger than the distance between the installation surface of the compressor and the lowest part of the compressor by providing a recess on the surface and disposing an elastic member in the recess. It may be. This makes it possible to increase the height of the effective elastic member in order to transmit vibration from the compressor to the refrigerator. On the other hand, the wall thickness of the installation surface is a factor that determines the size of the protrusions in the refrigerator compartment, but a certain amount of thickness is required as a structure to support the compressor and to obtain the cooling characteristics of the refrigerator. . Reduction of vibration transmission by increasing the height of the elastic member by forming a recess, and cooling characteristics by ensuring the wall thickness of the installation surface And ensuring the strength as a structure supporting the compressor can be achieved at the same time. By increasing the height of the elastic member that is effective for transmitting vibration from the compressor, unpleasant vibration and noise generation due to vibration can be significantly reduced, and heat insulation of the refrigerator can be achieved. Therefore, it is possible to maintain the characteristics by securing the properties and to maintain the transport resistance by securing the strength of the structure, and to provide a high-quality refrigerator.

[0041] In the refrigerator of the present invention, the lower side of the elastic member may be fitted and fixed using the entire circumference or a part of the depression provided on the installation surface. The position of the elastic member can be fixed without adding extra parts. In addition, the displacement of the compressor is eliminated, and the vibration transmission change due to the change of the support surface of the elastic member can be reduced. As a result, it is possible to provide a high-quality refrigerator that greatly reduces the generation of unpleasant vibration on the refrigerator installation surface of the elastic member and noise caused by the vibration, while reducing the cost and improving the transport resistance.

[0042] In the refrigerator of the present invention, the lower container of the sealed container may be provided with a hump portion having a concave or convex shape having a smaller curvature than the outer periphery of the sealed container. If there is a flat curved surface that is close to a flat part, the part becomes less rigid, and even if it is more susceptible to noise and vibration, the hump part improves the rigidity around the hump part. This can reduce the vibration and noise caused by the compressor.

[0043] In the refrigerator of the present invention, the bump portion may have a leg bump portion provided in the vicinity of a connection portion between the leg of the compressor provided in the sealed container and the sealed container. As a result, the rigidity in the vicinity of the connecting portion between the compressor and the leg can be improved, so that vibration and noise propagating to the refrigerator main body through the airtight container leg can be reduced.

[0044] In the refrigerator of the present invention, the bump portion may have a support bump portion provided in the vicinity of a connection portion between the lower end surface of the support member and the sealed container. Since the rigidity in the vicinity of the lower end portion of the support portion can be improved, vibration and noise transmitted from the compressor to the sealed container can be reduced.

[0045] The refrigerator of the present invention includes a hump portion formed in a lower container with a concave or convex shape having a smaller curvature than the outer periphery of the hermetic container, and the hump portion is a leg of a compressor provided in the hermetic container. It may be provided in the vicinity of the connection portion between the container and the closed container. By providing a leg in the hump part, it is possible to improve the rigidity in the vicinity of the connecting part between the compressor and the leg. Adhering surface Even if it has a bent part that rises upward, if the fixing part of the leg part to the hermetic container is a hump part, the hump part can reduce vibration in the vibration transmission path of the compressor. It becomes possible, and vibration transmission to the refrigerator can be reduced.

Hereinafter, embodiments of a compressor according to the present invention will be described with reference to the drawings.

The present invention is not limited to the embodiments.

[Embodiment 1]

FIG. 1 is a schematic cross-sectional view of the refrigerator according to the first embodiment of the present invention, FIG. 2 is a schematic rear view of the refrigerator according to the same embodiment, and FIG. 3 is an exploded schematic view of components of the refrigerator according to the same embodiment. 4 is a longitudinal sectional view of the compressor of the refrigerator according to the embodiment, FIG. 5 is a horizontal sectional view of the compressor of the refrigerator according to the embodiment, and FIG. 6 is a diagram of the refrigerator according to the embodiment. FIG. 7 is a comparative view of the induction motor and the inverter motor of the compressor, and FIG. 7 is a plan view of the salient pole concentration rod stator of the refrigerator compressor in the same embodiment. FIG. 8 is a perspective view of a leg portion of the compressor of the refrigerator in the same embodiment.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 8. Note that the same components as those in FIG. 15 are denoted by the same reference numerals, and detailed description thereof is omitted.

[0049] In FIGS. 1 to 3, the box body 1 is foamed in a space composed of an inner box 13 formed by vacuum forming a resin body such as ABS and an outer box 14 using a metal material such as a pre-coated steel plate. It is equipped with a heat insulating wall made by injecting a heat insulator 15 to be filled. As the heat insulator 15, for example, a hard urethane foam, phenol foam, styrene foam, or the like is used. In addition, as the foam material, it is even better from the viewpoint of preventing global warming to use hide-opened carbon-based cyclopentane.

[0050] The box body 1 is divided into a plurality of heat insulating sections, and a door 15a is provided on the front surface. The door 15a is configured such that the upper part is a revolving door type and the lower part is a drawer type. The insulated storage room 15b is a refrigerator room 2 from above, a drawer-type switching room 16 and an ice making room 17, a drawer-type vegetable room 3, and a drawer-type freezer room 4 arranged side by side. Each heat insulation section is provided with a door 15 a having heat insulation properties through a gasket 18. From the top, it is the refrigerating room rotary door 5, the switching room drawer door 19, the ice making room drawer door 20, the vegetable compartment drawer door 6, and the freezer compartment drawer door 7.

[0051] The refrigerator compartment revolving door 5 is provided with a door pocket 21 as a storage space. A plurality of storage shelves 22 are provided.

Next, details of the box body 1 will be described with reference to FIG. The outer box 14 of the box body 1 seals the U-shaped bent outer shell panel 24, the bottom panel 25, the rear panel 26, and the machine room panel 28 forming the recess 2 7 by cutting off the back side of the top surface 23. It is configured by assembling and securing. The assembled box body 1 is provided with a recess 27 in a portion extending over the top surface 23 and the back surface 28a. In addition, the bottom panel 25 and the back panel 26 are provided with handles made of depressions that can be hooked with fingertips.

[0053] The concave portion 27 includes an uppermost storage space 29a partitioned by the uppermost shelf 29 and the inner box 13 in the cabinet, and a second shelf storage space 30a partitioned by the second shelf 30 and the uppermost shelf 29. I am on a business trip with the convex part 30b on the side. More preferably, the indoor side bottom wall surface 30c of the convex part 30b and the shelf bottom part 30d of the uppermost shelf 29 are set to substantially the same horizontal plane.

In addition, the inner box 13 has a configuration in which the rear back portion that is slightly smaller than the outer box 14 is recessed inward. The inner box 13 is incorporated into the outer box 14, and the space formed between the inner box 13 and the outer box 14 is filled with a heat insulator 15. Therefore, the heat insulator 15 is also foam-filled in the left and right parts of the machine room panel 28 to form a heat insulating wall, and the strength is ensured simultaneously with the heat insulating property.

[0055] Next, the refrigeration cycle will be described mainly with reference to FIG. The refrigeration cycle is provided on the compressor 11 disposed on the installation surface 28b of the recess 27, the discharge pipe 31 connected to the compressor 11, the top surface 23 and the side surface of the outer shell panel 24, and the recess 27 and the bottom panel 25. A condenser (not shown), a capillary 32 as a decompressor, a dryer (not shown) for removing water, and an evaporator 8 in the vicinity of the vegetable compartment 3 and the freezer compartment 4 in the vicinity. And a suction pipe 33 connected in an annular shape.

[0056] The concave portion 27 is provided with a top cover 34 fixed with screws or the like. The compressor 11 and the machine room fan 34a, a condenser (not shown), a dryer (not shown) provided in the concave portion 27 are provided. (Not shown), part of the discharge pipe 31 and the suction pipe 33 are stored. The top of the top cover 34 is substantially flush with the top 23, and the top 34b of the compressor 11 is lower than the top 23.

[0057] The capillary 32 and the suction pipe 33 are copper pipes of approximately the same length, and are fixed by soldering so that heat exchange is possible, leaving the ends. Capillary 32 is internal for decompression. A small diameter steel pipe with high flow resistance is used, and the inner diameter of the pipe is adjusted from 0.6 mm to 1.0 mm with the length to design the amount of pressure reduction. The suction pipe 33 uses a large-diameter copper pipe to reduce pressure loss, and its inner diameter is about 8 mm for 6 mm force. The capillary 32 and the suction pipe 33 are combined into a compact by meandering the back surface of the refrigerator 2 in order to secure the length of the heat exchanging portion 35, and between the inner box 13 and the rear panel 26. Embedded in the heat insulator 15. The capillary 32 and the suction pipe 33 are connected to the evaporator 9 with one end protruding from the vegetable compartment 3 rearward force of the inner box 13 and the other end connected to the edge of the installation surface 28b of the machine room panel 28. The notch force provided in the upper part also protrudes upward and is connected to a dryer (not shown), a condenser (not shown), and the compressor 11 respectively.

[0058] In addition, the suction pipe 33 and the discharge pipe 31 are provided with a U-turn portion 36 in the vicinity of the connection portion with the compressor 11, for providing connection flexibility. 36 is stored in the recess 27. Furthermore, with the aim of improving assembly workability and serviceability, in order to reduce the density of the pipes and make the rear force pipe connection visible, the pipe connection part is on the back of the compressor 11. Facing the side, the compressor 11 is divided and placed on the left and right!

Next, details of the compressor 11 will be described.

[0060] As shown in Figs. 4 to 8, a mortar-shaped lower container 101 formed by deep drawing a rolled steel plate having a thickness of 2 to 4 mm and an inverted mortar-shaped upper container 102 are engaged, The sealed container 103 is formed by welding and joining the engaging portions over the entire circumference. A refrigerant 104 is stored inside the sealed container 103, and a refrigerating machine oil 105 is stored at the bottom. A leg 106 is fixed to the lower side of the hermetic container 103, and a hole 109 of the elastic member 107 is formed in a pin 108 provided in the recess 27 of the refrigerator through an elastic member 107 locked to the leg 106. The position is fixed by loose fitting.

[0061] Further, the leg 106 is elastically supported in the sealed container 103 via a support portion 113a as a support member and a spring 114, and the vertical center of gravity A of the compressor 11 and the leg 106 of the compressor 11 The distance B between the elastic member 107 and the contact surface 106a B force It is configured to be shorter than the distance C between the vertical center of gravity A of the compressor 11 and the lower end surface 113b of the supporting member. Here, the vertical center of gravity is a horizontal plane including the center of gravity of the compressor 11. [0062] As in the present embodiment, in the case where the vertical center of gravity A of the compressor 11 is above the contact surface 106a between the leg 106 of the compressor 11 and the elastic member 107, the compressor The contact surface 106a between the compressor leg 106 and the elastic member 107 is located higher than the lower end surface 113b of the support member inside.

[0063] Further, the height of the elastic member 107 is made larger than the distance F between the installation surface D in the concave portion of the compressor and the lowest end E of the compressor.

[0064] The leg 106 has a fixing surface 106b that is fixed to the closed container, a bent portion 106c that rises upward, and an elastic member arrangement lower surface 106d that locks the elastic member, and the fixing surface 106b and the bent portion 106c Ribs 106e extending over at least two of the elastic member disposing lower surface 106d are provided.

The electric element 110 includes a rotor 111 and a salient pole concentrated winding stator 112. The compression element 113 is built above the electric element 110 and is driven by the electric element 110.

[0066] The electric element 110 and the compression element 113 are both housed in the hermetic container 103, and elastically supported by the bottom part of the lower container 101 and the lower end of the stator 112 via a support part 113a as a support member and a spring 114. Yes.

[0067] The support portion 113a and the spring 114 provided at the lower end of the stator 112 are support members that elastically support the mechanical portion.

[0068] A terminal 115 constituting a part of the lower container 101 is for communicating electricity (not shown) inside and outside the sealed container 103, and supplies electricity to the electric element 110 through the lead wire 116. In addition, the sealed container 103 contains a discharge tube 120 for connection to the discharge pipe 31 of the refrigeration system, a suction tube 121 for connection to the suction pipe 33, and a refrigerant 104 in the refrigeration system, and then the system is closed. A sealing tube 122 is provided.

[0069] As shown in FIG. 5, when the compression element 113 is operated, the refrigerant 104 is sucked into the sealed container 103 through the suction pipe 33 and the suction tube 121, while the discharge tube 120. To the discharge pipe 31. This discharge pipe 31 connects the compression element 113 and the discharge tube 120 of the sealed container in an inertial manner! /

[0070] Next, details of the compression element 113 will be described below.

[0071] The shaft 130 includes a main shaft portion 131 in which the rotor 111 is fixed by press-fitting or shrink fitting, and the main shaft portion 1 An eccentric portion 132 formed eccentrically with respect to 31 is provided. The cylinder block 133 has a substantially cylindrical compression chamber 134 and a bearing portion 135 for supporting the main shaft portion 131 of the shaft 130, and is formed above the electric element 110.

[0072] At this time, a rotor recess 11la is formed on the compression element side of the rotor 111, and the bearing portion 135 extends into the rotor recess 111a.

The piston 136 is movably inserted into the compression chamber 134 and is connected to the eccentric portion 132 of the shaft 130 by the connecting means 137. The rotational movement of the shaft 130 is converted into the reciprocating movement of the piston 136. The piston 136 expands and contracts the space of the compression chamber 134 so that the refrigerant 104 in the hermetic container 103 is sucked from the suction port 141 of the suction muffler 140, while the valve (not shown) provided inside the cylinder head 142. The refrigerant 104 is discharged to the discharge pipe 31 outside the sealed container 103 through the discharge muffler 143, the discharge pipe 144, and the discharge tube 120 formed in the cylinder block 133.

[0074] The discharge pipe 144, which is a high-pressure pipe, is a steel pipe with an inner diameter of 1.5 mm to 3. Omm, and is formed to be flexible using L-shaped or U-shaped bending. It is inertially connected to the discharge tube 120 of the container 103!

[0075] Next, details of the electric element 110 will be described below.

[0076] As shown in FIG. 6, the rotor 111 includes a main body portion 150 in which silicon steel plates of 0.2 mm to 0.5 mm are stacked, a hole 152 that houses a permanent magnet 151 provided in the main body portion 150, and a permanent magnet. It consists of an end plate 153 that closes the hole 152 after the magnet 151 is inserted, and is fixed integrally by a force pin 154.

[0077] The stator 112 is composed of a stator core 161 in which silicon steel plates of 0.2 mm to 0.5 mm are stacked and a copper wire 162 that is a copper wire having an insulation coating of 0.3 mm to lmm. . The stator core 161 has a salient pole portion 171 formed in an annular shape at a predetermined interval, and a winding wire 162 is wound around the salient pole portion 171 (referred to as a salient pole concentrated winding). It is connected to one line with communication line 172.

Next, the inverter motor and the induction motor will be compared and described.

[0079] For easy understanding, in FIG. 6, the section of the induction motor is shown on the left side of the center line MM, and the cross section of the inverter motor is shown on the right side. So Each electric motor is used for a compressor having almost the same maximum refrigerating capacity.

[0080] The height L1 of the stator core 161 of the stator 112 of the inverter motor is significantly lower than the height HI of the stator core 181 of the stator 180 of the induction motor. The height L4 of the inverter 111 of the inverter motor is also lower than the height H4 of the rotor 182 of the induction motor. Furthermore, in the inverter motor using salient pole concentrated rods, the coil end heights L2 and L3, which are the heights at which the winding wire 1 62 protrudes from the stator core 161, are the same as the coil end height of the winding wire 183 of the induction motor. It is significantly lower than H2 and H3. Furthermore, by using rare earth magnets as the permanent magnet 151, the height L5 of the permanent magnet 151, the height L1 of the stator core 161 of the inverter motor, and the height L4 of the rotor 111 can be further reduced. I can do it.

[0081] The operation and action of the refrigerator configured as described above will be described below.

[0082] First, the temperature setting of each heat insulation section will be described. Refrigeration room 2 is usually set at 1-5 ° C, with the lower limit being the freezing temperature for refrigerated storage. The switching chamber 16 can be set to a desired temperature range from the freezer compartment temperature range to the refrigeration / vegetable room temperature range, depending on user settings. The ice making chamber 17 is an independent ice storage chamber and is set at a relatively high temperature of −18 ° C. to −10 ° C.

[0083] The vegetable room 3 is often set to 2 to 7 ° C, which is set to a temperature that is the same as or slightly higher than that of the refrigerator room 2. Freezer compartment 4 is usually set at -22 to -18 ° C for cryopreservation, and may be set at lower temperatures, for example -30 ° C, to improve storage conditions. .

[0084] Each chamber is divided by a heat insulating wall in order to efficiently maintain different temperature settings. The heat insulating wall is formed by foaming and filling the heat insulating body 15 between the inner box 13 and the outer box 14. It is formed. The heat insulator 15 has sufficient heat insulating performance and also has an effect of ensuring the strength of the box body 1.

[0085] Next, the operation of the refrigeration cycle will be described. The cooling operation is started and stopped by signals from a temperature sensor (not shown) and a control board (not shown) according to the set temperature in the cabinet. In response to the instruction to start the cooling operation, the compressor 11 discharges the high-temperature and high-pressure refrigerant 104. The discharged refrigerant 104 passes through the discharge pipe 31 and is condensed in a condenser (not shown). It dissipates heat and condensates and is reduced in pressure by the capillary 32 to become a low-temperature and low-pressure liquid refrigerant. The liquid refrigerant that has reached the evaporator 9 is evaporated and evaporated in the evaporator 9, and the low-temperature cold air that has undergone heat exchange is distributed by a damper (not shown) to cool each chamber.

Next, the operation of the compressor 11 will be described.

[0087] When the compressor 11 is energized, electricity is supplied to the stator 112 of the electric element 110 through the terminal 115 and the lead wire 116, and the rotor 11 1 is rotated by the rotating magnetic field generated by the stator 112. Rotate. Due to the rotation of the rotor 111, the eccentric portion 132 of the shaft 130 connected to the rotor performs a rotational motion that is eccentric from the axis of the shaft 130. The eccentric motion of the shaft 130 is converted into a reciprocating motion by the connecting means 137 connected to the eccentric portion 132 and becomes a reciprocating motion of the piston 136 connected to the other end of the connecting means 13 7. The refrigerant 104 is sucked and compressed while the volume in 134 is changed.

The volume that the piston 136 sucks and discharges during one reciprocation in the compression chamber 134 is referred to as a cylinder volume, and the cooling capacity changes depending on the cylinder volume.

In the refrigerator that performs the operation as described above, the compressor 11 supported by the elastic member 107 and the legs 106 is mounted in a recess 27 formed across the top surface 23 and the back surface 28a of the refrigerator. The depth (height) of the recess is at least the minimum gap between the bottom of the lower container 101 of the compressor 11 and the installation surface 28b, the height of the compressor 11, and the minimum gap between the upper container 102 and the top cover 34. The thickness of the top cover 34 is required. In order to avoid contact between the compressor 11 and the installation surface 28b or the top cover 34, a minimum clearance is required, and if the top surface cover 34 has a strength surface force and a minimum thickness, the depth of the recess (high Is determined by the height of the compressor 11.

[0090] On the other hand, the convex portion 30b travels in the refrigerator cabinet due to the concave portion 27. When the convex portion 30b is large, the storage property is deteriorated, and when the refrigerating chamber rotary door 5 is opened and the inside of the refrigerator compartment 2 is viewed, the protruding portion of the convex portion 30b makes the appearance worse. Therefore, a technique for reducing the height of the compressor 11 is required.

[0091] The height of the compressor 11 will be specifically described. The compressor 11 uses a steel plate of 2 to 4 mm for the lower container 101 and the upper container 102, and the total is about 7 mm. Each of the lower container 101 and the upper container 102 has a shape with a curvature in the vertical direction. This is because a low-noise specification is desired to make the living space where the refrigerator is installed comfortable. By increasing the rigidity, the rigidity and eigenvalue of the container are increased, and noise due to resonance is suppressed. The radius of curvature is about RlOOmm and the radius is about 150mm. To get this curvature, a little over 13mm is needed on one side.

Next, refrigerating machine oil 105 is stored at the bottom of the sealed container 103. The refrigerating machine oil 105 is sealed in approximately 200 to 250 ml to guarantee the operation of the compressor 11 under various conditions, and occupies about 20 mm in height. Furthermore, when the refrigeration oil 105 and the electric element 110 come into contact with each other, an abnormal increase in input occurs, so that a clearance of about 9 mm is required to prevent contact.

[0093] In the refrigerator in which the compressor 11 is loaded on the top surface 23 of the refrigerator, the compressor 11 approaches the position of the user's ear, so it is more important to suppress the noise of the compressor 11 as well. In other words, it is important to improve the rigidity of the hermetic container 103. On the other hand, from the viewpoint of improving the reliability, a space for preventing the refrigerator oil 105 and the electric element 110 from contacting each other is necessary. For these reasons, the plate thickness is 7 mm, the curvature is 13 mm, the curvature and oil are 20 mm, and the 9 mm necessary to secure the clearance is required to be 49 mm.

Accordingly, the height of the compressor 11 is largely determined by the electric element 110 and the compression element 113.

The compression element 113 is a force that can make the piston 136, the connecting means 137, the shaft 130, and the bearing portion 135 compact by reducing the cylinder volume, and the refrigeration capacity decreases as the cylinder volume decreases. In the present embodiment, in order to obtain a large capacity with a small cylinder volume, the compression element 113 is made compact by operating at a rotational speed higher than the commercial power supply frequency (50 Hz or 60 Hz in Japan). More specifically, since the cylinder volume can be reduced by about 30%, the diameter of the piston 136 can be reduced, and the load acting on the shaft 130 can be reduced. Therefore, the length of the bearing portion 135 that supports the shaft load is also reduced. Thus, the electric element 110 can be configured close to the compression element 113. By making good use of the high rotation speed of the inverter, the inventor's design has made it possible to achieve a compact size of 5 to 10 mm.

[0095] The setting of the plurality of rotation speeds of electric element 110 by the inverter method does not necessarily correspond to a frequency higher than the commercial power supply frequency (50 Hz or 60 Hz) in Japan. Including the number of revolutions, it must not be a requirement.

[0096] That is, the upper limit of a plurality of frequencies that exceed the commercial power supply frequency (not limited to Japan) is expected to be an energy-saving effect and a silent effect as a combination of settings. There is also a combination that does not adopt the compacting of the cylinder volume of the compression element 113 by the effect of reducing the thickness of the electric element 110 due to.

Next, the electric element 110 will be described. In the induction motor shown on the left side of the center line in FIG. 6, the torque necessary for the operation of the compressor 11 is not generated unless the thicknesses HI and H4 of the stator 180 and the rotor 182 are large. On the other hand, the use of an inverter motor using permanent magnet 151 for rotor 111 eliminates the need for the excitation current necessary for generating rotational torque, so the thickness L1 of stator 112 and the thickness of rotor 111 L4 can be lowered, and the electric element 110 can be made compact. More specifically, an induction motor must pass current to the rotor side (secondary side). In order to obtain this excitation current, a force inverter motor that requires a high thickness is required. Since the inverter motor has a magnet on the secondary side, no excitation current is required to generate torque, and the thickness can be reduced. It is.

[0098] Furthermore, the dimensions L2 and L3 of the stator wire 162 of the stator 112 of the electric element 110 that protrude from the stator core 161 are significantly smaller than the protrusion dimensions H2 and H3 of the conductor wire 183 in the distribution cage. That is, in the concentrated winding of salient poles, the windings do not cross between the separated slots, and are concentrated in each salient pole part so that they are densely wound. Since the swell is eliminated, the size becomes significantly smaller as shown by L2 and L3, the overall height of the stator 112 is reduced, and the electric element 110 can be made more compact.

[0099] Furthermore, when a rare earth magnet is used as the permanent magnet 151 of the inverter motor, the magnetic properties are excellent, such as a magnetic flux density of about 4 times and an energy product of about 10 times that of a general ferrite magnet, Even if it is small, sufficient characteristics can be obtained. Accordingly, the height L5 of the permanent magnet 151 and the height of the stator L1 can be further reduced, and the electric element 110 can be further made compact.

[0100] In the present embodiment, a rotor recess 111a is formed on the rotor 111 on the compression element 113 side, and a bearing portion 135 extends into the rotor recess 111a. this Therefore, the mechanical part including the electric element 110 and the compression element 113 can be arranged by overlapping the electric element 110 and the compression element 113 on the projection surface in the height direction without shortening the length of the bearing part 135. The overall height can be greatly reduced, and the height of the compressor can be further reduced without reducing the reliability of the compressor.

[0101] More specifically, in the design of the inventor, in the induction motor, the stacking force of the stator 1 80 is 2 mm, the coil end height H2 of the winding 183, H3 is 25 mm, and the height of the rotor 182 is H4 is 65mm. On the other hand, in the inverter motor, the stator L 112 has a thickness L1 of 26 mm, and when a rare earth magnet is used, the lower L1 is 16 mm, and the coil end heights L2 and L3 of the stator wire 162 of the stator 112 are: L2 and L3 are 9mm when using salient pole concentration rods. In addition, the rotor 111 has a thickness of 35mm and can be reduced to 20mm by using rare earth magnets, so it can be reduced by up to 58mm compared to a compressor using an induction motor.

[0102] Further, as described above, the rotor recess 11 la is formed on the compression element 113 side of the rotor 111 at a depth of more than half of the rotor height direction. The bearing part 135 extends. For this reason, the height of the machine part can be reduced to about 10 mm, which is the extension of the bearing part 135, while the thickness of the rotor 111 is reduced to 35 mm (20 mm if a rare earth magnet is used). The total height of the machine part can be reduced by about 25mm.

[0103] By extending the extension allowance of the bearing portion 135 in this way, the sliding length between the shaft 130 and the bearing portion 135 can be increased without increasing the overall height, and the compressive load applied to the shaft 130 can be reduced. Since the size can be reduced, the reliability of the compressor can be improved.

However, as the extension length of the bearing portion 135 is increased, the depth of the rotor recess 11 la is increased, so that the fixing margin of the rotor 111 to the shaft 130 is shortened.

[0105] In particular, the compressor element 113 is disposed in the upper part as in the present embodiment, and the electric element 110 is positioned in the lower part thereof. The rotor is held only by the fixing force with the shaft. For this reason, for example, when an electric motor that obtains a magnetic force by flowing current inside the rotor, such as an induction motor, the heat generated by the rotor 111 during operation increases and thermal expansion causes Since there is a possibility that the rotor 111 falls off from the shaft 130, there is a problem in reliability that it is not possible to significantly reduce the allowance for fixing the rotor 111 to the shaft 130. According to the inventor's study, when the permanent magnet 151 is used, since the magnetic force is obtained by the permanent magnet without flowing the current inside the rotor 111, the heat generation is greatly reduced, and the induction is further reduced. Since the weight is lighter because the height is lower than that of the electric motor, the rotor 111 can be held even if the fixing allowance is significantly shortened. For example, even if the fixing allowance is reduced to about 6 mm, which is 20% or less of the total height of the rotor 111 of 35 mm, the fixing force is sufficient. For this reason, the rotor 111 does not fall off the shaft 130 due to heat generated during operation, vibration or impact due to transportation, and the like. The entire machine part consisting of the compression element 113 and the electric element 110, while improving the reliability by increasing the sliding length of the shaft 130 and the bearing part 135 and securing the fixing force between the rotor 111 and the shaft 130. Can be reduced.

[0106] Further, since the fixing allowance of the rotor 111 is shortened, the oil supply capability by the oil supply mechanism (not shown) provided inside the shaft 130 can be improved. This is a lift that raises the refrigerator oil 105 up to the spiral groove for refueling the shaft 130 so that the distance between the lower end sliding between the bearing portion 135 and the shaft 130 and the refrigerator oil 105 is a spiral groove for oil supply of the shaft 130. This is because As a result, the oil supply capacity to the sliding part between the shaft 130 and the bearing part 135 and the sliding part of the compression element 113 via the shaft 130 is improved, thereby improving the reliability. It is.

[0107] When the compressor 11 is operated at a lower rotation speed by installing the inverter motor as in the present embodiment, the refueling is performed using the centrifugal force of the shaft in proportion to the decrease in the rotation speed. A decrease in the lubrication capacity becomes a problem. By improving the oil supply capability in this manner, it is possible to stably supply the refrigerating machine oil 105 to the sliding portion even when the compressor 11 is operated at a lower speed.

[0108] As described above, in order to achieve the downsizing in the height direction while simultaneously preventing the rotor 111 from falling off and improving the oil supply reliability, a permanent magnet is used for the rotor 111 having a total height of 35 mm. An experiment for confirming the amount of oil supply was conducted by changing the fixing allowance between the rotor 111 and the shaft 130 at a rotational speed of 50 Hz. [0109] As a result, the amount of lubrication is improved by about 3% when the fixing allowance between the rotor 111 and the shaft 130 is 50% of the total rotor height compared to 80% of the total rotor height. However, a certain effect on the improvement of the oil supply amount has started to be obtained, and when the rotor height is 30%, the oil supply amount is improved by about%, and in the case of 15%, the oil supply amount is improved to about 8%. .

[0110] Furthermore, in order to confirm the improvement of the oil supply reliability at the time of low rotation by the inverter compressor, an experiment for confirming the oil supply amount at 20 Hz was conducted. As a result, when the fixing allowance between the rotor 111 and the shaft 130 is 50% compared to 80% of the total height of the rotor, the oil supply amount is improved by about 5% and a certain effect on the oil supply amount is improved. The oil supply amount improved by about 10% when it was further increased to 30%, and the oil supply amount increased to about 15% when it was 15%.

[0111] As described above, by extending the bearing into the rotor, the head for raising the refrigerating machine oil 105 to the spiral groove for oil supply is shortened, and the oil supply reliability is improved. In both normal and low rotations, the effect starts when the fixing allowance is set to 50% or less of the total rotor height. Desirably, a fixed effect allowance is obtained by setting it to 30% or less. In addition, if the fixing allowance is further shortened and reduced to about 15%, the effect is further enhanced. On the other hand, in some cases, the reliability of the rotor holding starts to appear. Therefore, since it is necessary to fully confirm the use of the fixing allowance, it is desirable that the fixing allowance should not be less than 15% as much as possible. Should.

[0112] In particular, at the time of low rotation, raising the refrigerating machine oil 105 to the spiral groove for oil supply. Shortening the lift head is very effective in improving the oil supply amount. In recent years, energy conservation in refrigerators has been progressing, and the operation of compressors with low rotation speed, which is effective for energy conservation, is becoming mainstream. However, since the oil supply amount inevitably decreases at this low speed, various improvements have been made in the oil supply structure inside the compressor to improve the oil supply amount. In addition to the improvement of the oil supply amount by shortening the fixing allowance as in the present embodiment and the effect of reducing the overall height of the compressor and lowering the center of gravity, the effect of improving the oil supply amount at the time of low rotation is also obtained. It is a technology that has multiple beneficial effects.

[0113] In order to reduce the compressor 11 and make the top of the compressor 11 lower than the top surface 23 of the box body 1, the electric element 110 of the compressor 11 includes a plurality including at least a frequency higher than the commercial power supply frequency. The permanent magnet 151 is used as the rotor 111 of the electric element 110. By reducing the size of the compressor 11, the height of the recess 27 in which the compressor 11 is installed can be reduced, so that the storage capacity of the lower stage of the refrigerator is improved. At the same time, the protrusion of the concave portion 27 toward the storage space in the storage space of the concave portion 27 becomes small, so that the appearance is improved, and the storage property can be greatly improved by widening the storage space in the storage space.

[0114] In addition, a salient pole concentrated saddle type in which a plurality of salient pole portions 171 of a stator core 161 constituting the stator 112 of the compressor 11 is wound around a winding 162 via an insulator, and permanent. Magnet 151 151 Compressor 11 can be further reduced by using rare earth magnets. As a result, the height of the concave portion 27 in which the compressor 11 is installed can be reduced, so that the storage property of the lower stage of the refrigerator is improved and the protrusion of the convex portion 30b toward the storage space side of the concave portion 27 is reduced. The appearance is improved and the storage space in the cabinet is widened, so the storage performance is greatly improved.

[0115] In the compressor 11 of the present embodiment, the compression element 113 is a reciprocating type including a compression chamber 134 and a piston 136 that reciprocates in the compression chamber 134. 13 and the electric element 110 are inertially supported via the spring 114.

As described above, the following effects can be obtained by reducing the height of the compressor 11 with elements other than the support structure portion of the compression element 113 and the electric element 110. In other words, although it is easy to achieve low vibration compared to rotary compressors, etc., it is a reciprocating compressor that has structural limitations and has a limitation in application to a refrigerator with an upper compressor placed in the height dimension. Even if is used, the overall height of the compressor can be reduced. As a result, it is possible to reduce the vibration, which is a big problem when the compressor 11 is arranged at the top. For this reason, even in a refrigerator with an upper compressor arrangement where vibration may be transmitted to the box body 1, the height of the recess 27 in which the compressor 11 is installed is reduced while removing the user's discomfort, and the lower compartment of the refrigerator is stored. It is possible to provide a refrigerator with improved usability.

[0117] In the present embodiment, the reciprocating compressor is an internal low pressure type, and the electric element 110 is disposed below the sealed container 103 and is a support member for the sealed container 103. It is supported by inertia through a support portion 113a and a spring 114. Further, as shown in FIG. 5, the compression element 113 is disposed above the electric element 110 and is connected via a discharge pipe 144 which is a high-pressure pipe having a shape force capable of elastic support with respect to the sealed container 103. The It is connected. Here, the shape that can be elastically supported is a shape that is not linear, for example, a curved shape having a U-shaped portion or the like. Further, the compression element 113 which is a vibration source of the compressor is arranged via the electric element portion 110 with respect to the support member in the hermetic container 103. Thereby, the distance of the elastic support portion force can be further increased as compared with the case where the compression element 113 is directly elastically supported. The vibration generated in the compression element 113 is attenuated when passing through the stator of the highly rigid electric element 110 and then transmitted to the outside of the compressor because of the support member force of the compressor. can do

[0118] Further, the discharge pipe 144, which is a high-pressure pipe in the compression element 113, has a shape force that can be elastically supported, so that the vibration of the compression element 113 is attenuated by the discharge pipe 144 and then the compressor Since it is transmitted to the outside, the vibration of the compressor can be further reduced.

[0119] Further, the leg 106 is elastically supported in the hermetic container 103 via a support portion 113a as a support member and a spring 114, and the vertical center of gravity A of the compressor and the leg 106 of the compressor are elastic. The distance B between the contact surface 106a and the member 107 is shorter than the distance C between the vertical center of gravity A of the compressor and the lower end surface 113b of the support member. As a result, the amplitude of the vibration of the compressor is such that the entire compressor vibrates around the center of gravity A so that the vibration increases as the center of gravity A is the smallest and the center of gravity force increases. Since the vibration amplitude of the contact surface between the leg 106 and the elastic member 107 closer to the center of gravity A than the lower surface of the arm is reduced, vibration transmission to the refrigerator can be further reduced.

[0120] In addition, the permanent magnet 151 is used for the rotor 111, and the height of the rotor 111 is lowered, or the stator 112 is made a salient pole concentrated saddle to reduce the height of the stator 112. The center of gravity A of the entire electric element 110 can be lowered.

[0121] When the stator 112 is a distributed winding, since the ridgeline protrudes upward from the attachment part of the cylinder block 133 to the stator 112, the dimension of the leg of the cylinder block 133 is set to the protrusion dimension of the ridgeline. It was necessary to take more than that. On the other hand, by making the stator 112 into a salient pole concentrating saddle type, it is possible to shorten the leg of the cylinder block 133 that is the attachment part of the cylinder block 133 to the stator 112, and the center of gravity A of the compression element Can also be lowered. [0122] Furthermore, by extending the extension allowance of the bearing portion 135 of the cylinder block 133 to the rotor recess 11la, the cylinder block 133 can be lowered further and the center of gravity A can be lowered.

[0123] In this way, the center of gravity A of the mechanical part inside the compressor is further lowered, and the contact surface 106 between the leg 106 and the elastic member 107 provided in the hermetic container 103 that is outside the compressor is further increased. By positioning it upward, the distance B between the center of gravity A, the contact surface between the leg 106 and the elastic member 107 is further reduced, and the transmission of vibration to the compressor-powered refrigerator can be further reduced.

[0124] In general, in a refrigerator with a compressor disposed at the top, it is particularly important when it is necessary to reduce the overall height of the compressor as much as possible, but it is essential to achieve both low vibration and low noise. . Various factors for reducing the size of the compressor are conceivable. In terms of the internal configuration, a permanent magnet 151 is used for the rotor 111. Thus, while maintaining the effect of holding the rotor 111 by the shaft 130, the bearing portion 135 can be extended further into the rotor to reduce the internal height. In addition, by raising the mounting surface of the legs 106 on the elastic member 107 on the external configuration surface, the overall height can be reduced even when installed in the refrigerator, and the support stability is low with a low center of gravity!ヽ A low vibration type compact compressor can be realized.

[0125] In the present embodiment, the contact surface 106a between the leg of the compressor and the elastic member is positioned above the lower end surface 113b of the support member. As a result, the vibration of the compressor is transmitted downward through the support member by directing the force downward from the mechanical part that is the vibration generation source, and then the direction changes upward and is transmitted to the elastic member 107 via the legs 106. . Therefore, since the vibration transmission path becomes complicated, the vibration is further damped in the transmission path. Further, since the support member can also increase the distance to the contact surface 106a between the leg 106 of the compressor and the elastic member 107, the vibration transmission in a particularly high frequency region is attenuated, and the leg 106 and the elastic member 107 are reduced. Since the amplitude of the vibration of the abutting surface 106a is reduced, the transmission of vibration to the refrigerator can be further reduced, and a high-quality refrigerator free from unpleasant vibration and noise caused by vibration can be provided.

Further, as shown in FIG. 8, the leg 106 has a fixing surface 106b that is fixed to the sealed container 103, a bent portion 106c that rises upward, and an elastic member arrangement lower surface 106d that locks the elastic member. Accordingly, the leg 106 is positioned on the fixing surface 106b of the lower part of the sealed container 103 with good workability such as joining, and the surface on which the elastic member is disposed is closer to the center of gravity A and the lower surface of the elastic member is disposed. The 1S bend can be formed by simple bending of the legs, making it very easy to manufacture. [0127] Further, the fixing surface 106b of the leg 106 fixed to the sealed container 103 is below the lower end surface 113b, which is the fixing surface of the support member 113a of the lower container 101. The vibration of the compression element 113 which is the vibration source of the compressor is the most from the excitation source among the sealed containers 103 through the electric element 110 and also through the spring 114 supported by the support member 113a. Since the vibration is transmitted to the fixing surface of the support member 113a at a remote location, the vibration is greatly damped.

[0128] Further, the leg 106 has an elastic member disposition lower surface 106d after extending in a substantially horizontal direction from the fixing surface 106b, rising vertically upward through a bent portion 106c, and then bending in a substantially horizontal direction again. Yes. With this shape, the vibration transmission path is complicated and long from the fixing surface 106b fixed to the sealed container 103 to the contact surface 106a with the elastic member 107, and the vibration transmission is attenuated. In addition, the elastic member disposition lower surface 106d is closer to the center of gravity A in the vertical direction of the compressor, and the elastic member 107 can be sufficiently long. The transmission can be sufficiently reduced, and it is possible to provide a high-quality refrigerator that does not generate unpleasant vibrations or noise caused by vibrations.

[0129] In the present embodiment, the vertical height of the leg 6 is set to 24 mm. This is about 16% of the total height of the compressor.

[0130] In the present embodiment, the vertical rising height is above the lower end surface 113b of the support portion 113a. Since the lower end portion of the spring 114 engaged with the support portion 113a is fitted to the support portion 113a and is fixed without having elasticity with respect to the sealed container, it has elasticity with respect to the sealed container. It is preferable that it is above the lower end of the spring.

[0131] Further, as the rising height in the vertical direction increases, the distance of the rising portion becomes longer, and it becomes difficult to obtain high rigidity in the rising portion. Especially when the external force is also a horizontal impact force due to opening and closing of the refrigerator door, etc., a vibration phenomenon occurs in which the vertical direction twists back and forth around the contact surface 106a between the leg 106 and the elastic member 107. The As a result, stress concentration occurs around the rising portion of the leg 106, which may reduce reliability. Therefore, considering the external impact force, the vertical rise height of the leg 6 It is considered desirable for the reliability of the compressor to be about 30% or less of the total height of the compressor.

[0132] Further, the formation of the bent portion 106c makes it possible to increase the distance from the surface where the leg 106 is fixed to the sealed container 103 to the lower surface of the elastic member on which the elastic member 107 is disposed. Since the distance of vibration transmission from the fixing surface 106b becomes longer, the transmission of the region is attenuated particularly at a high frequency, and the vibration transmission to the refrigerator can be made less. Therefore, manufacture is easy and vibration transmission to the refrigerator can be reduced, and providing a high-quality refrigerator free from unpleasant vibration and noise caused by vibration can be achieved at low cost.

[0133] Furthermore, by providing the leg 106 with the bent portion 106c and the rib 106e extending over the elastic member disposition lower surface 106d, the rigidity of the leg 106 is increased and the eigenvalue of the leg 106 itself is increased. In addition, since the leg 106 itself vibrates, the adhesion surface force of the sealed container 103 can further reduce vibration transmission to the elastic member and the refrigerator main body via the leg. In addition, the rib can be formed by an easy-to-manufacture press, and the strength of the leg is increased. Therefore, another problem that the leg is deformed by the transport impact of the refrigerator can be improved.

[0134] Therefore, manufacture is easy and vibration transmission to the refrigerator can be reduced, and providing a high-quality refrigerator free from unpleasant vibration and noise caused by vibration can be achieved at low cost. .

[0135] As described above, the downsizing elements in the height direction of the compressor 11 can be broadly distinguished from the viewpoints corresponding to the electric element 110 and the viewpoint corresponding to the compression element 113. The power to be adopted together Whether to keep it as one of the factors should be selected based on the balance between the height reduction requirement and other characteristics and quality.

[0136] For example, a relatively high-precision durability reliability is not required and is not a major factor of noise and vibration. The upper arrangement is advantageous in terms of miniaturization while suppressing the effects on noise and vibration.

[0137] On the other hand, if the purpose is to be achieved by downsizing the compression element 113, it can be expected to be downsized at a lower cost, which is advantageous in terms of cost performance.

[0138] Further, as described above, the compressor 11 is arranged on the upper portion of the refrigerator box body 1 so that the user's ears are placed. If it is close to the location, it is necessary to consider noise and vibration more than conventional refrigerators. In other words, a combination of miniaturization elements that does not affect the noise and vibration of the refrigerator as the miniaturization by reducing the height of the compressor 11 is essential. The structure that supports the electric element 110 and the compression element 113 and the structure that supports the sealed container 103 incorporate a device to reduce the height while suppressing noise and vibration, or reduce the height of the noise and vibration. Consideration that does not dare to incorporate the design is also effective.

[0139] Next, the uppermost storage space 29a and the second storage space 30a of the refrigerator will be described. The back of the uppermost storage space 29a is a place that is difficult to reach, and even if the rear side of the uppermost storage space 29 is blocked by the convex portion 30b, the usability does not deteriorate. Rather, the depth becomes shallower and food can be stored within the reach of the hands, so that it is possible to prevent misplacement after the expiration date, and usability is improved.

[0140] On the other hand, when the convex portion 30b is on a business trip to the second storage space 30a side, the convex portion 30b becomes conspicuous when the refrigerator door 5 is opened, and the appearance is poor. In addition, there is an inconvenience that when food is stored or taken out in the second stage storage space 30a, it is difficult to put food in and out in the middle. By making the shelf bottom portion 30d of the uppermost storage space 29a and the horizontal surface of the convex portion 30b, which is the bottom wall surface on the indoor side of the concave portion 27, have substantially the same horizontal plane, the appearance is almost continuously connected. For this reason, the appearance of the protrusion 30b is not felt and the appearance is improved, and the compressor 11 can also be accommodated in the predetermined recess 27.

[0141] In addition to not being able to feel the protrusion of the convex part 30b and improving the appearance, storage items such as foods that are lower than the height of the front opening of the second stage storage space 30a can be smoothly put in and out. There is no inconvenience.

[0142] More specifically, the distance from the top surface 23 to the shelf bottom 30d of the uppermost storage space 29a is 25mm, and the uppermost storage space is 25mm thick from the top surface 23 to the inside of the cabinet. If the height of 29a is 140mm and the shelf thickness is 10mm, it will be 175mm. In addition, since it is the uppermost part in the cabinet, it becomes 140 mm when the dimensions are determined so that the standard product of a 350 ml can beverage with a height of 123 mm and a diameter of 66 mm can be taken out by tilting it diagonally. Recess 27 Compressor 11 installation surface 28b thickness 20mm, clearance between compressor 11 and installation surface 28b and top cover 1 34 Clearance between inner surface 3mm each and top cover 34 thickness 2mm Storage space If the shelf bottom portion 30d of the casing 29a and the indoor side bottom wall surface 30c of the recess 27 are substantially the same horizontal plane, the maximum height of the compressor 11 that can be accommodated in the recess 27 is 147 mm.

[0143] On the other hand, when the dimensions of the compressor 11 are examined more specifically, the total thickness of the lower container 101 and the upper container 102 of the hermetic container 103 is 7 mm, and the height for obtaining the curvature of the upper container 102 is 7 mm. 14 mm, the upper part of the cylinder block 133 with the compression chamber 134 is 39 mm, the dimension to the stator 112 mounting surface on the side with the bearing 135 is 20 mm, the height of the stator 112 is 26 mm, the lower end of the stator 1 12 Force The dimension to the lower end of the rotor 111 is 9 mm, the lower end force of the rotor 111 is 9 mm from the refrigeration oil 105, and the height of the refrigeration oil 105 is 20 mm. The total of these is 144 mm, which can be accommodated in the height space in the aforementioned recess 27 in the present embodiment.

[0144] Since the height dimension of this type of compressor in a conventional standard capacity refrigerator is approximately 190 mm or more, the height dimension can be greatly reduced. In particular, by using an inverter motor that uses a permanent magnet 151 for the rotor 111 that is operated at a plurality of rotational speeds including frequencies higher than those of commercial power, the compression element 113 and the electric element 110 of the compressor 11 are appropriately dimensioned. Can be configured. Further, the compressor 11 can be accommodated in the predetermined recess 27 while maintaining rigidity for keeping the noise of the sealed container 103 good. As a result, the horizontal surface of the convex portion 30b, which is the bottom wall surface on the indoor side of the concave portion 27, and the shelf bottom portion 30d can be made to be substantially the same horizontal surface. It can provide a good-looking refrigerator without feeling tension.

[0145] Furthermore, by incorporating the downsizing element in the height direction as the main component of the improvement of the electric element 110, the problem of ensuring the reliability of the noise and the vibration surface associated with the specification change of the compression element 113 is reduced. In particular, it can be an effective means for reducing the height while solving the problem of noise and vibration for a refrigerator in which the compressor 11 is arranged in the upper part of the refrigerator and noise and vibration are concerned.

[0146] In the present embodiment, the ground height of the box body 1, that is, the height of the top surface 23 from the floor surface is set to 1800 mm or less. This height is set based on the maximum height that can be reached by a Japanese woman of standard height reaching up.

[0147] If the height of the top 23 from the floor is higher than 1800mm, the height of the compressor 11 is increased. Although it is easy to accommodate in the recess 27 even if it is not compact, the convenience of the upper part of the refrigerator becomes worse, making it difficult to achieve both storage efficiency and usability as a whole refrigerator.

[0148] In the present embodiment, the height of the top surface 23 from the floor surface is suppressed to 1800mm or less, so that first consideration is given to the use and use of the inside of the cabinet. By connecting the dimensions as much as possible, the merit of suppressing the invasion of the effective space inside the warehouse can be maximized and the storage efficiency can be maximized.

[0149] In the present embodiment, a rib 106e extending across the bent portion 106c and the elastic member disposing lower surface 106d is provided. The rib 106e preferably forms a rib 106e extending over at least two of the fixing surface 106b, the bent portion 106c, and the elastic member arrangement lower surface 106d. It extends to the part and the bent part 106c.

[0150] Further, when the rib 106e is formed across the three surfaces of the fixing surface 106b, the bent portion 106c, and the elastic member arrangement lower surface 106d, the rigidity can be further improved. In particular, when the elastic member disposing lower surface 106d is disposed significantly upward, the distance from the fixing surface 106b to the elastic member disposing lower surface 106d is greatly increased. In this way, ribs are formed across the three surfaces. Therefore, improving the rigidity of the legs is very effective for the purpose of reducing vibration and noise.

[0151] (Embodiment 2)

FIG. 9A is a schematic cross-sectional view of the refrigerator in the second embodiment of the present invention, and FIG. 9B is a main-portion cross-sectional view of the refrigerator in the second embodiment of the present invention.

Note that the same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

[0153] In addition, configurations and operational effects that are common to the first embodiment will not be described one by one, but the same contents are included unless they are unreasonable when applied to the present embodiment. Is.

As shown in FIG. 9A, the box body 1 has a ventilation duct 201 that communicates with the concave portion 27 immediately below the top surface 200. Further, the compressor 11 is installed on the installation surface 28b of the recess 27 so that the top 203 of the compressor 11 comes to a position lower than the top surface 200 higher than the lower surface 202 of the ventilation duct 201. A condenser 204 is disposed above the ventilation duct 201. The condenser 204 is connected to the discharge pipe 31. Communicate. The top surface 200 of the ventilation duct 201 is configured in substantially the same horizontal plane as the top surface of the top cover 34 of the recess 27, or integrally formed. Further, the ventilation duct 201 sucks air from the intake 205, passes through the concave portion 27 in which the condenser 204 and the compressor 11 are installed, and then sucks the air from the outlet 206 of the top cover 3 4!

[0155] In the configuration as described above, the top portion of the compressor 11 is disposed at a position higher than the lower surface 202 of the ventilation duct 201, which is lower than the top surface 200 of the box body 1. Therefore, the recess 2 for accommodating the compressor 11 is used. The projecting allowance to the inner side of 7, that is, the projecting allowance of the convex portion 30b is reduced, so that the space in the warehouse can be used more effectively.

[0156] Further, the height of the compressor 11 may be designed to fall within the total height range including the height of the ventilation duct 201 and the height of the recess 27. For example, in a large refrigerator, even if various elements of miniaturization according to Embodiment 1 are incorporated, and a compressor having a relatively large refrigeration capacity must be adopted, the degree of freedom in design can be increased. This makes it easy to provide a large refrigerator with high storage capacity and a refrigerator with the compressor 11 placed behind the top.

[0157] On the other hand, the ventilation duct 201 necessary for cooling the compressor 11 is arranged on the top surface 200, which is difficult to reach in the refrigerator, so the vicinity of the top surface 200 is effectively used for purposes other than storage. it can. Further, since the top 203 of the compressor 11 is arranged at a position higher than the lower surface 202 of the ventilation duct 201 which is lower than the top surface 200 of the box body 1, the top force of the compressor 11 is projected in the ventilation direction of the ventilation duct 201. As a result of being disposed in the plane, the top portion 203 having the highest temperature in the compressor 11 is efficiently cooled, and the characteristics and reliability of the compressor 11 are also improved. Furthermore, by configuring the condenser 204 inside the ventilation duct 201, the heat dissipation effect of the condenser 204 is enhanced, and the efficiency of the system can be improved.

[0158] Next, attention is focused on the uppermost storage space 29a and the second storage space 30a of the refrigerator. The back of the uppermost storage space 29a is a hard-to-reach place, and even if the rear side of the uppermost storage space 29a is blocked by the convex portion 30b, the usability is not affected. Rather, the depth becomes shallower, and food and other stored items are within the reach of the hand. Therefore, it is possible to prevent the product from being left behind after the expiration date, and the usability is improved. On the other hand, if the convex part 30b is on a business trip to the second storage space 30a side, the convex part 30b is conspicuous when the refrigerating compartment revolving door 5 is opened, and it does not look good. The In addition, when food is stored or taken out in the back of the second storage space 30a, it becomes difficult to put food in and out in the middle. Therefore, by making the shelf bottom 30d of the uppermost storage space 29a and the interior bottom wall 30c of the recess 27 approximately the same horizontal plane, the appearance is connected almost continuously. The compressor can also be accommodated in the predetermined recess 27 in a state where it does not feel and looks good.

[0159] It should be noted that the substantially same horizontal plane means that the indoor side bottom wall surface 30c of the concave part 27 and the shelf bottom part 30d of the uppermost storage space 29a have substantially the same horizontal plane. In some cases, 30c and the upper side of the shelf, which is the lower end of the uppermost storage space 29a, have substantially the same horizontal plane. For example, by causing the uppermost shelf 29 to be embedded in the lower surface of the indoor-side bottom wall surface 30c of the recess, it is possible to avoid an abutment form in the front-rear direction between the uppermost shelf 29 and the indoor-side bottom wall surface 30c of the recess. By positioning the shelf that forms the uppermost storage space 29a in the vicinity of the bottom wall surface 30c on the indoor side of the recess 27, it is connected to the exterior almost continuously, and the protrusion of the protrusion 30b is not felt and the appearance is good. The compressor can also be accommodated in the predetermined recess 27.

[0160] Stored items such as food that are lower than the height of the frontage of the second-stage storage space 30a can be smoothly put in and out, eliminating inconvenience.

[0161] Since the uppermost storage space 29a is at a high position and is difficult to store, it is preferable to make the height of the storage portion as low as possible. Therefore, if the standard height of the 350ml can beverage (height 123mm) is set to the minimum height that can be stored, it is most efficient to set the storage height of the uppermost storage space 29a to 125mm with a gap of 2mm at the top. The inside of the warehouse can be used.

[0162] In the refrigerator shown in FIG. 9A, the dimensions are verified more specifically.

[0163] The distance from the shelf bottom 30d of the uppermost storage space 29a to the top surfaces of the top surface 200 and the top cover 34 including the ventilation duct 201 can be 180 mm. That is, the plate thickness of the top surface 200 forming the ventilation duct 201 is 2 mm, the inner height of the ventilation duct 201 is 18 mm, the heat insulation wall thickness between the lower surface 202 of the ventilation duct 201 and the interior is 25 mm, and the uppermost storage The height of space 29a is 125mm, which is the minimum height that can contain 350ml canned beverages, and the shelf thickness is designed to be 10mm. Recess 27 Compressor 11 installation surface 28b thickness 20mm, clearance between compressor 11 and installation surface 28b and top cover 34 If the thickness of the cover 34 is 2 mm and the shelf bottom 30d of the uppermost storage space 29a and the indoor bottom wall 30c of the recess 27 are substantially the same horizontal plane, the recess 27 and the ventilation duct 201 can be accommodated within the combined height. The maximum height of the compressor 11 is 152 mm. It can be designed to accommodate the compressor 11 having a height of 144 mm shown in the first embodiment, and can easily meet the demand for increasing the size of the compressor in response to the increase in size of the refrigerator.

[0164] As described above, it is possible to achieve an external harmony between the storage space that has digged into the interior of the compressor 11 and the uppermost storage space. In addition, because it is usually unusable, it is relatively easy to use because it is a relatively empty storage space, especially the uppermost storage space 29a, where the unusable rear space is assigned to the compressor housing recess 27. In the front space, among the food stored in the refrigerator, canned drinks that are often stored at a time can be stored vertically. As a result, the storage capacity of the entire refrigerator compartment increases, and the uppermost storage space 29a can be used effectively.

As described above, the ventilation duct 201 communicating with the recess 27 is provided so as to be the top surface 200 of the box body 1, and the ventilation duct 201 in which the top 203 of the compressor 11 is lower than the top surface 200 of the box body 1. So that it is higher than the lower surface 02.2. With this configuration, the ventilation data 201 necessary for cooling the compressor 11 etc. is placed in the vicinity of the top surface 200, which is inconvenient to use, so that the vicinity of the top surface 200 is effectively used for purposes other than storage. It is possible to improve the storage capacity in the cabinet. In addition, since the top 203 of the compressor 11 is arranged at a position higher than the lower surface 202 of the ventilation duct 201, which is lower than the top surface 200 of the box body 1, the temperature at the compressor 11 is highest and the top 203 is efficient. Cooled well, the characteristics and reliability of the compressor 11 are improved.

In the present embodiment, the top cover 34 covering the ventilation duct 201 as shown in FIG. 9A extends to the front side of the refrigerator to form the ventilation duct 201 as shown in FIG. 9B. Make the top force bar 34 so that it only covers the top surface of the recess 27! In this case, since air is sucked from the intake 205 provided in the front opening of the ventilation duct 201, the user force cannot see the intake 205, so that dust or the like adhering to the intake 205 is not directly observed. Since the position is not visible to the user, the appearance design of the refrigerator can be improved. In particular, when the top panel is not equipped with a condenser, it is desirable to have a bowl shape that does not extend the top cover forward. [Embodiment 3]

10 and 11 are schematic cross-sectional views of the refrigerator compressor according to Embodiment 3 of the present invention.

[0168] Further, configurations and operational effects that are common to Embodiments 1 and 2 will not be described step by step.

1S It is assumed that the same contents are included unless it is an unreasonable matter applied to this embodiment.

[0169] As shown in Fig. 10 and 1 U, the main shaft portion 210b, the sub shaft portion 210c, and the main shaft portion 210b are supported on the same axis with the eccentric element 210a of the shaft 210 sandwiched between the compression element 209ί and the shaft 210. The main bearing 220, which is a bearing portion, and the auxiliary bearing 221 that pivotally supports the auxiliary shaft portion 210c.

[0170] The eccentric part 210a is provided with a piston 232 that reciprocates in the compression chamber 231 via the connecting member 230.

Also, as shown in FIG. 11, the sealed container 250 includes an upper container 251 and a lower container 252. The plurality of legs 260 fixed to the lower container 252 are installed in the recesses via the elastic member 270. A recess 281 is provided in the concave compressor installation surface 280, and an elastic member 270 is provided in the recess 281. The compressor is mounted so that the height of the elastic member 270 is larger than the distance between the compressor installation surface 280 and the lowermost part 290 of the compressor. Further, the lower side of the elastic member 270 is fitted and fixed in the recess 281. The lower side of the elastic part 702 may be fitted using the entire circumference of the recess 281 or may be fitted using a part of the periphery of the recess 281.

[0172] The operation and action of the compressor configured as described above will be described below.

[0173] During operation of the compressor, the refrigerant is compressed to a high pressure in the compression chamber 231. Therefore, the compression load is transmitted to the eccentric portion 210a via the piston 232 and the connecting member 230.

[0174] The compressive load force received by the eccentric portion of the shaft 210 is transmitted to the entire shaft 210 and squeezed so that a large surface pressure is applied to the sliding portion between the main shaft portion 210b of the shaft and the main bearing 220. Or,.

[0175] This surface pressure increases as the sliding length between the main shaft portion 210b of the shaft 210 and the main bearing 220 becomes shorter. In the present embodiment, the shaft 21 is provided at two locations: the main shaft portion 210b of the shaft 210 and the main bearing 220, the sub shaft portion 210c of the shaft 210, and the sub bearing 221 that pivotally supports the shaft 21. 0 is supported. In other words, the piston 232 that is the vibration source can be supported by both side forces, the shaft can be prevented from being bent further, and the reliability of the sliding surface of the shaft 210 can be improved. In addition, even if the sliding length of the main bearing 220 is shortened compared to the conventional case, the sliding length of the entire shaft 210 can be secured by complementing the sliding length of the sub-bearing 221. The height of the compressor can be further reduced without lowering the reliability.

That is, this embodiment makes it possible to secure a bearing length for supporting the shaft 210, which is one of the major problems in reducing the height in a reciprocating compressor. The compressor of this embodiment has the main bearing 220 and the sub-bearing 221 on both sides of the eccentric portion 210a having the piston 232 that performs reciprocating motion, and thus supports the piston 232 that is a vibration source with both side forces. Can. As a result, the deflection of the shaft 210 can be prevented and the reliability of the sliding surface of the shaft can be improved, so that the reliability of the compressor can be ensured even if the sliding length of the main bearing is shorter than before. Can do. As a result, the height of the compressor can be further reduced without reducing the reliability of the compressor.

[0177] In the present embodiment, the auxiliary bearing 221 is provided on the opposite side of the main bearing 220 with the eccentric portion 210a interposed therebetween, but the auxiliary shaft portion is provided coaxially with the main shaft portion 210b with the rotor 240 interposed therebetween. However, similarly, the bearing length for pivotally supporting the shaft 210 can be secured. Since the reliability of the compressor can be ensured even if the sliding length of the main bearing is shorter than before, it is possible to further reduce the height of the compressor without reducing the reliability of the compressor. it can.

[0178] Further, the compressor is installed in the recess, and the recess 281 is provided in the compressor installation surface 280 of the recess, and the elastic member 270 is provided in the recess 281. By making the height of the elastic member 270 larger than the distance between the compressor installation surface 280 and the lowermost part 290 of the compressor, the elastic member 270 effective to transmit the vibration of the compressor force to the refrigerator The height can be increased.

[0179] On the other hand, the wall thickness of the installation surface is a factor that determines the size of the convex portion into the refrigerator compartment, but as a structure that supports the compressor and to obtain the cooling characteristics of the refrigerator, a certain thickness is is necessary. By providing the recess 281, vibration transmission can be reduced by increasing the height of the elastic member 270, cooling characteristics can be ensured by securing the thickness of the installation surface, and strength as a structure supporting the compressor can be ensured. Can be compatible. In other words, transmit vibration from the compressor By increasing the height of the effective elastic member, unpleasant vibration and noise generation due to vibration can be greatly reduced, while maintaining the characteristics by ensuring the heat insulation of the refrigerator, Transport strength can be maintained by ensuring the strength of the structure, and a high-quality refrigerator can be provided.

[0180] By forming the recess as the external support structure that supports the compressor in this manner, the height of the elastic member can be increased to reduce vibration. In other words, the compressor height can be further reduced and the reliability of the compressor can be reduced. Furthermore, unpleasant vibration caused by the compressor and noise generation caused by the vibration can be greatly reduced. It is possible to reduce the size of the convex part into the refrigerator of the type in which the compressor is mounted on the top surface of the refrigerator.

[0181] In addition, by fitting and fixing the lower side of the elastic member, it is possible to fix the position of the elastic member without adding extra parts, eliminating the displacement of the compressor, and changing the support surface of the elastic member. Vibration transmission change due to can be reduced. It is possible to provide a high-quality refrigerator that significantly reduces unpleasant vibrations on the refrigerator installation surface of the elastic member and noise caused by vibration, while reducing the cost and improving the transport resistance.

[0182] (Embodiment 4)

FIG. 12 is a schematic cross-sectional view of the refrigerator compressor according to Embodiment 4 of the present invention. FIG. 13A is a schematic perspective view of the sealed container of the refrigerator compressor in Embodiment 4 of the present invention, and FIG. 13B is a plan view of the bottom surface force of the sealed container of the refrigerator compressor in Embodiment 4 of the present invention. is there. FIG. 14 is a schematic cross-sectional view of a sealed container of a compressor as an example of Embodiment 4 of the present invention.

[0183] Also, configurations and operational effects common to Embodiments 1 and 2 will not be described in detail.

1S It is assumed that the same content is included unless it is an unreasonable matter applied to this embodiment. In this embodiment, the sealed container for the compressor described in Embodiments 1 and 2 is used. An explanation will be given.

As shown in FIG. 12, a plurality of bumps 410 are provided in the lower part of the sealed container 403.

[0185] The plurality of bump portions 410 are mainly formed as a convex bump portion in which the internal force of the sealed container is also convex outward, and a concave shape that is concave from the outside to the inside of the sealed container 403. And a concave bump. [0186] The convex bump portion includes a leg bump portion 410a in the vicinity of a connecting portion 420 between the compressor leg 406 and the closed vessel 403 provided in the closed vessel 403. The leg bump portion 410a is a convex bump portion formed around the connection portion 420 with a curvature that is clearly smaller than the curvature of the outer periphery of the sealed container.

[0187] Further, the support member 413 that supports the electric element inside the sealed container and the mechanical part having the compression element force includes a support part 413a and a spring 414 that is an elastic member. In the vicinity of the hermetic container located on the lower end surface of the support portion 413, a support bump portion 410b is provided. The support bump portion 410b is a convex bump portion that is formed with a curvature that is clearly smaller than the curvature of the outer periphery of the hermetic container in the periphery vertically below the support portion.

[0188] Further, the hermetic container 403, the leg 406, and the lower support portion 413a of the spring 414 are fixed by spot welding. That is, the leg 406 and the lower end portion of the support portion 413 are welded to the convex bump portion.

[0189] In addition, the closed container has a concave bump 411 that is recessed inward from the outer periphery of the closed container, and has a curvature that is clearly smaller than the curvature of the outer periphery of the closed container. It is formed continuously.

[0190] The operation and action of the compressor configured as described above will be described below.

[0191] As in the present embodiment, when a plurality of bumps 410 are provided particularly in the lower part of the sealed container 403, for example, compression is applied to the upper and lower surfaces of the sealed container in order to reduce the height direction of the compressor. It becomes difficult to provide a curved surface that is almost spherical from the center of the machine, and the upper and lower surfaces of the sealed container tend to be curved so that they are close to a flat surface.

[0192] If there is a flat curved surface close to the flat surface in the shape of the sealed container 403 as described above, the portion becomes less rigid and easily affected by noise and vibration.

[0193] In the present embodiment, the supporting bump portion 410b is provided in the vicinity of the hermetic container located on the lower end surface of the supporting part 413 of the mechanical part that is a vibration generation source and the hermetic container. When the vibration of the machine part propagates to the closed container via the spring 414, a support bump part 410b having a small curvature is provided in the vicinity of the fixing surface between the lower end of the support part 413a and the closed container 403. As a result, the rigidity in the vicinity of the lower end portion of the support portion can be improved, so that vibration and noise propagating from the compressor to the sealed container can be reduced. [0194] Further, by providing a leg cove portion 410a in the vicinity of the connecting portion 420 between the compressor leg 406, which is the external support of the compressor on the lower surface side of the sealed container, and the sealed container 403, the vicinity of the connecting portion 420 Therefore, the airtight container force can also reduce the vibration and noise transmitted to the refrigerator main body via the legs 406.

[0195] By providing the bump-shaped convex portions in the vicinity of the support portions on the inner side and the outer side of the compressor in this way, the lower surface side of the hermetic container is large so that it is close to a plane in order to reduce the overall height of the compressor Even in the case of a curved surface of curvature, it is possible to provide a refrigerator with further reduced vibration and noise by using a compressor with improved rigidity, particularly in the vibration transmission path of the sealed container.

[0196] Further, in the present embodiment, the concave bump portion 411 is formed continuously with the support bump portion 410b and is recessed inside the sealed container. Thus, the concave and convex portions having a small curvature are continuously formed in a complicated shape. By forming it like this, there is an effect of further improving the rigidity of the hump portion.

[0197] Further, in addition to the provision of a hump portion having a small curvature around the vibration transmission path of the sealed container 403, the leg 106 and the elastic member 107 of the compressor as described in the first and second embodiments It is also possible to adopt a configuration in which the contact surface 106a is positioned above the lower end surface 113b of the support member. As a result, the vibration of the compressor is transmitted downward through the support member by directing downward from the mechanical part that is the source of vibration, and then the direction changes upward and is transmitted to the elastic member 107 via the legs 106. Since the rigidity of the transmission path can be increased and the transmission path can be complicated, the vibration of the refrigerator can be further reduced.

[0198] Further, in addition to including a hump portion having a small curvature around the vibration transmission path of the hermetic container 403, a recess 281 is provided on the compressor installation surface 280 of the recess as described in the third embodiment. In addition, the elastic member 270 may be disposed in the recess 281. In this way, when the compressor is mounted so that the height of the elastic member 270 is greater than the distance between the compressor installation surface 280 and the lowest part 290 of the compressor, In addition to the effect of reducing vibration transmission to the legs, the elastic member can be made larger, and the vibration and noise of the refrigerator can be further reduced.

[0199] Further, in addition to providing a hump portion 410 having a small curvature around the vibration transmission path of the sealed container 403, a fixing surface 456a of a leg 456 can be provided on the hump portion as shown in FIG. The In this case, the fixing surface force as described in the first embodiment also has a bent portion that rises upward. Even in this case, the fixing portion of the leg portion to the sealed container is the hump portion. By doing so, it is possible to reduce the vibration in the vibration transmission path of the compressor by the bump portion. Therefore, even when the leg does not have a bent part that rises upward as well as the force of the adhering part to the sealed container, the compressor leg 456 and the contact part 458 of the elastic member 457 are more connected to the center of the compressor in the vertical direction A. It can arrange | position in the site | part near. As a result, the amplitude of the vibration of the compressor is such that the entire compressor vibrates around the center of gravity where the vicinity of the center of gravity A is the smallest and the vibration increases as the distance from the center of gravity A increases. Nearer the center of gravity A, the amplitude of vibration of the contact surface 458 between the leg 456 and the elastic member 457 becomes smaller, so that vibration transmission to the refrigerator can be further reduced.

[0200] Therefore, manufacture is easy and vibration transmission to the refrigerator can be reduced, and providing a high-quality refrigerator free from unpleasant vibration and noise caused by vibration can be achieved at low cost. .

Industrial applicability

[0201] As described above, since the refrigerator useful for the present invention can be used effectively and conveniently in the refrigerator, it can be applied to equipment using a cooling device such as a household or commercial refrigerator.

Claims

The scope of the claims

[1] A refrigerator,

A box body with a storage room having a door on the front;

A recess formed to be recessed toward the uppermost storage space in the storage chamber across the top and back surfaces of the box body;

A compressor installed in the recess,

A sealed container;

An electric element housed in the sealed container;

A compressor having a compression element housed in the hermetic container and driven by the electric element;

The electric element has a stator and a rotor, and is an inverter-driven electric motor operated at a plurality of rotation speeds;

The refrigerator in which the rotor has a permanent magnet to reduce the height of the compressor, and the top of the compressor is disposed lower than the top surface of the box body.

[2] The top surface of the box body further has a ventilation duct communicating with the recess,

The refrigerator according to claim 1, wherein the top portion of the compressor is lower than the top surface of the box body and higher than a lower surface of the ventilation duct.

[3] The refrigerator according to claim 1 or 2, wherein the stator is a salient pole concentration type stator in which a winding is wound around a plurality of salient pole portions of the stator core via an insulator.

[4] The permanent magnet of the rotor is a rare earth permanent magnet.

The refrigerator according to any one of claims 1 to 3.

[5] The refrigerator according to any one of claims 1 to 4, wherein the shelf bottom of the uppermost storage space and the indoor side bottom wall surface of the recess are substantially the same horizontal surface.

6. The refrigerator according to claim 5, wherein a height of the uppermost storage space is a height at which a 350 ml can beverage standard product can be stood and stored.

[7] The height of the top surface of the box body from the floor surface is 1800 mm or less.

The refrigerator according to any one of claims 1 to 6.

[8] The compressor is of a reciprocating type including a compression chamber and a piston that reciprocates in the compression chamber. A compressor,

The compression element is elastically supported relative to the sealed container;

The refrigerator according to claim 1.

[9] The compression element is:

A shaft having a main shaft portion and an eccentric portion;

The rotor provided in the main shaft portion;

A bearing portion that pivotally supports the main shaft portion;

While having a rotor recess on the compression element side of the rotor,

The refrigerator according to claim 8, wherein the bearing portion extends into the rotor recess.

[10] The compression element has, on the same axis, a main shaft portion, a sub shaft portion, a main bearing that supports the main shaft portion, and a sub bearing that supports the sub shaft portion, and the eccentric portion includes In between, it has the main shaft portion and the main bearing on one side, and has the sub shaft portion and the sub bearing on the other side,

The refrigerator according to claim 8.

[11] The compression element has, on the same axis, a main shaft portion, a sub shaft portion, a main bearing that supports the main shaft portion, and a sub bearing that supports the sub shaft portion, and sandwiches the rotor. And having the main shaft portion and the main bearing on one side, and having the sub shaft portion and the sub bearing on the other side,

The refrigerator according to claim 8.

[12] The compressor is an internal low-pressure type,

The electric element is disposed below the sealed container, and is elastically supported via a support member with respect to the sealed container.

The compression element is disposed on top of the electric element and is elastically connected to the hermetic container via a high-pressure pipe.

The refrigerator according to claim 8.

[13] The sealed container includes an upper container and a lower container,

A plurality of legs fixed to the lower container are installed in the recess through an elastic member, a contact surface between the legs and the elastic member is disposed above a lowermost part of the compressor, The refrigerator according to claim 1, wherein a height is greater than a distance between an installation surface of the compressor in the recess and a lowermost part of the compressor.

[14] A mechanical part is composed of the electric element and the compression element,

The mechanical unit is elastically supported in the sealed container via a support member, and a distance between the vertical center of gravity of the compressor and a contact surface between the leg of the compressor and the elastic member The refrigerator according to claim 1, wherein is shorter than a distance between a center of gravity of the compressor in the vertical direction and a lower end surface of the support member.

[15] A mechanical part is composed of the electric element and the compression element,

The mechanical unit is elastically supported in the sealed container via a support member, and a contact surface between the leg of the compressor and the elastic member is positioned above a lower end surface of the support member. The refrigerator according to claim 1.

[16] The leg according to any one of claims 13 to 15, wherein the leg includes a fixing surface that is fixed to the sealed container, a bent portion that rises upward, and an elastic member disposing lower surface that locks the elastic member. Refrigerator.

17. The refrigerator according to claim 16, wherein the leg has a rib extending over at least two locations on the fixing surface, the bent portion, and the lower surface of the elastic member arrangement.

[18] The sealed container includes an upper container and a lower container,

The lower container has a plurality of legs;

The recess has a recess formed in the installation surface of the compressor,

The leg is fixed to the recess through an elastic member provided in the recess, and the height of the elastic member is larger than the distance between the installation surface and the lowest part of the compressor. The refrigerator described.

[19] The refrigerator according to claim 18, wherein the lower side of the elastic member is fitted into and fixed to the entire circumference of the recess or at least a part of the entire circumference.

[20] The sealed container has an upper container and a lower container,

The lower container has a bump portion, and the bump portion is a concave bump portion or a convex bump portion having a smaller curvature than the outer periphery of the sealed container. The refrigerator of description.

21. The refrigerator according to claim 20, wherein the bump portion includes a leg bump portion formed in the vicinity of a connecting portion between a leg of a compressor provided in the sealed container and the sealed container.

[22] A mechanical part is composed of the electric element and the compression element,

The machine part is supported in the sealed container via a support member, and the bump part is formed in the vicinity of a connection part between the machine part, a lower end surface of the support member, and the sealed container. 21. The refrigerator according to claim 20, comprising a hump portion.

[23] The compressor in which the lower container includes a concave or convex hump portion having a smaller curvature than an outer periphery of the lower container, and the concave or convex hump portion is provided in the lower container. The refrigerator according to claim 13, wherein the refrigerator is formed in the vicinity of a connection portion between a leg and the sealed container.

[24] The sealed container has an upper container and a lower container,

The lower container includes a concave or convex bump portion having a smaller curvature than the outer periphery of the lower container, and the concave or convex bump portion is provided in the lower container; The refrigerator according to claim 14 or 15, wherein the refrigerator is formed in the vicinity of a connection portion with the sealed container.