WO2006043613A1

WO2006043613A1 - Refrigerator

Info

Publication number: WO2006043613A1
Application number: PCT/JP2005/019267
Authority: WO
Inventors: Yoshito Kimura; Syouhei Inamori; Shinichi Hashimoto
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2004-10-20
Filing date: 2005-10-20
Publication date: 2006-04-27
Also published as: TWI341918B; JP4496944B2; TW201122393A; TW200624741A; TWI422790B; JP2006145187A

Abstract

A refrigerator capable of preventing a refrigerator oil from reversely flowing out of a compressor disposed on the top surface of an heat insulating box. The refrigerator comprises the internal low pressure type compressor disposed on the top surface of the heat insulating box, an evaporator installed under the compressor, a suction pipe connecting the compressor to the evaporator, and an oil outflow prevention trap in the suction pipe. Accordingly, though the compressor is also fallen sideways when the refrigerator is carried in the state of being fallen sideways in carrying and transferring the refrigerator, the refrigerator oil can be prevented from reversely flowing out of the compressor by the oil outflow prevention trap. Thus, the supply of the oil to the sliding parts of the compressor can be secured in the compressor to further reduce damage to the compressor.

Description

Technical field

TECHNICAL FIELD [0001] The present invention relates to a refrigerator that improves the outflow prevention performance of oil that is a refrigerating machine oil in a compressor power refrigerating cycle.

Background art

[0002] In recent years, refrigerators are required to improve the usability and storage property as the power of the viewpoint of protecting the global environment further advances in energy saving.

[0003] A conventional refrigerator of this type uses a compressor or the like that forms a machine room, and is installed on the top of the refrigerator body or on the upper back of the refrigerator body. . Such a conventional method is disclosed in, for example, Japanese Patent Application Laid-Open No. 11-183014.

FIG. 18 shows a configuration of a conventional refrigerator described in Japanese Patent Laid-Open No. 11 183014.

[0005] The refrigerator body 1 is composed of a refrigerator compartment 2, a vegetable compartment 3, and a freezer compartment 4 from the top. The refrigerator compartment 2 has a revolving door 5, and the vegetable compartment 3 has a vegetable compartment drawer door 6. The freezer compartment 4 has a freezer compartment drawer door 7. In this configuration, the cooling unit 10 having the isolator fan 8 and the evaporator 9 isotherm is approximately the same height as the opening of the freezer compartment 4 that forms the storage section as the lowermost storage compartment. It is installed at the rear rear of the. The compressor 11 is installed on the top surface of the refrigerator room 2 which is not easy to use, or on the recess 12 provided on the upper back of the refrigerator body 1.

[0006] The storage volume of the compressor 11 has moved from the lower side to the upper side of the partition wall that partitions the refrigerator compartment 2 and the vegetable compartment 3, so that if the internal volume of each storage compartment is constant, the refrigerator compartment 2 is inevitably required. And the position of the partition wall of the vegetable compartment 3 can be lowered downward, so that the contents stored in the vegetable compartment 3 can be easily taken out.

However, in the conventional configuration, the compressor is disposed on the top surface of the refrigerator main body, and the evaporator is disposed near the bottom surface of the refrigerator main body, so that the suction pipe (not shown) connected to the compressor and the evaporator are evaporated. Will be placed below the compressor. Therefore, when transporting or moving the refrigerator, including the customer and delivery capacity to the storefront, carry the refrigerator on its side. When doing so, there is a problem that refrigeration oil (hereinafter referred to as oil) flows backward from the compressor and stays down after installation.

[0008] When the oil flows backward and flows out, the amount of oil inside the compressor decreases. The suction pipe is designed to have a large outer diameter of 6.35mm to 7.94mm to reduce pressure loss. If the pipe wall thickness is 0.35mm and the length is 2000mm, the internal volume will be 50ml. About 80ml. Since the length of the suction pipe limits the length of heat exchange between the exhaust and the suction pipe, the length of the suction pipe cannot be shortened in order to achieve high efficiency. Furthermore, when the volume of the evaporator pipe is added, the volume becomes very large. Furthermore, if the suction pipe is increased in diameter to reduce pressure loss, the volume of the pipe will increase.

[0009] On the other hand, with regard to the amount of oil stored in the compressor, the smaller the size of the compressor, the more effective the volume of the refrigerator can be reduced. The influence that the fluctuation of the storage amount changes the oil surface height becomes large. To make it easier to understand, if the bottom surface of the compressor is 140mm and 100mm square pillars, and the capacity of the internal storage parts is emptied, the oil surface height of lmm will change due to the oil amount fluctuation of 14ml. The oil level height of 3.5mm to 5.7mm will be reduced even if the previous 50ml to 80ml spill is performed. Actually, there is a volume of internal storage, and the higher the oil level, the larger the storage volume, so there will be a further decrease in the oil level.

[0010] By the way, since the compressor 11 supplies the oil stored in the lower part to the sliding part using differential pressure or centrifugal force, the oil to the sliding part is reduced by reducing the oil surface height. The supply amount may decrease and the sliding part may wear out.

[0011] In addition, when the oil in the pipe is cooled, the force gradually returns to the compressor as the refrigerant circulates. If a large amount of high-viscosity oil flows out, it immediately returns to the compressor against gravity. It is difficult.

Disclosure of the invention

[0012] The refrigerator includes a heat insulation box, a compressor provided in the heat insulation box, a condenser, a decompressor, and an evaporator in order to form a series of refrigerant flow paths, and an interior of the compressor. Oil that is sealed in the space containing the components, and the suction pipe that connects the compressor and evaporator And an oil spill prevention trap that prevents oil from flowing out of the compressor to the evaporator side. The compressor is an internal low pressure type and is disposed on the top surface of the heat insulating box. Is provided below the compressor.

[0013] The refrigerator has a heat insulating box provided with a recessed portion at the rear of the top surface, an internal high-pressure compressor disposed in the recessed portion, and a condenser provided on the top surface of the heat insulating box, The compressor and the condenser are connected by a discharge pipe, and the condenser is arranged in front of and higher than the discharge pipe connection portion of the compressor.

Brief Description of Drawings

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

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

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

[Fig. 4] Fig. 4 is a schematic perspective view of the main part of the suction pipe of the refrigerator in the first embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view of a compressor mounted on the refrigerator in the first embodiment of the present invention.

[Fig. 6] Fig. 6 is a schematic cross-sectional view of the state of transport of the refrigerator in the first embodiment of the present invention.

FIG. 7 is a schematic cross-sectional view of the compressor when transporting the refrigerator in Embodiment 1 of the present invention.

FIG. 8 is a schematic cross-sectional view of a compressor mounted on a refrigerator in Embodiment 2 of the present invention.

[Fig. 9] Fig. 9 is a schematic perspective view of the main part of the suction pipe of the refrigerator in the third embodiment of the present invention.

FIG. 10 is a schematic perspective view of a main part of a suction pipe of a refrigerator in a fourth embodiment of the present invention.

FIG. 11 is a schematic perspective view of a main part of a suction pipe of a refrigerator in a fifth embodiment of the present invention.

[Fig. 12] Fig. 12 is a schematic perspective view of the main part of the suction pipe of the refrigerator in the fifth embodiment of the present invention. is there.

13] FIG. 13 is a schematic perspective view of the main part of the suction pipe of the refrigerator in the sixth embodiment of the present invention.

FIG. 14 is a schematic cross-sectional view of a compressor mounted on a refrigerator in Embodiment 7 of the present invention.

15] FIG. 15 is a schematic cross-sectional view of the compressor mounted on the refrigerator in the eighth embodiment of the present invention.

圆 16] FIG. 16 is a plan sectional view of the compressor mounted on the refrigerator in the eighth embodiment of the present invention.

FIG. 17 is a schematic cross-sectional view of a compressor mounted on a refrigerator in Embodiment 9 of the present invention.

FIG. 18 is a schematic sectional view of a conventional refrigerator.

Explanation of symbols

1 Insulated box

2 Refrigerated room (upper storage room)

3 Vegetable room (lower storage room)

4 Freezer room (lower storage room)

5 Refrigerating room revolving door

6 Vegetable room drawer door

7 Freezer compartment door

8 Cooling fan

9 Evaporator

11, 100 Compressor

13 Inner box

14 Outer box

15 insulation

25 Bottom panel

26 Back panel Dent

Machine room panel Bottom handle

Rear handle

Machine room fan

, 106, 200 Suction piping Top cover

Oil spill prevention trap Piping U-bent part, 102, 201 Lower shenole, 101 Upper shenole

Compressor shell a Shell joint

, 63, 107 Discharge piping, 108, 210 Oil, 109 Motor, 111 Stator, 112 Rotor

Eccentric shaft Shaft

bearing

, 135 cylinder head, 136 cylinder

Piston

Rod, sliding part

Chamber one 60 Suction piping compressor connection

61 Suction piping weld connection

62 Compressor (internal high-pressure compressor)

65 condenser

66 Discharge piping connection

67 Top duct cover

68 Suction opening

69 Discharge opening

104 Rotation drive (internal components)

105 Compression section (internal components)

132 B bearing (tilt prevention means)

134 A bearing

139 Inhalation muffler

203 Electric elements (internal components)

203a rotor

204 Compression element (internal component)

205 Support

243 Bearing

BEST MODE FOR CARRYING OUT THE INVENTION

[0016] The present invention solves the above-described conventional problems, and an object thereof is to provide a refrigerator having a refrigeration cycle in which oil is prevented from flowing out of the compressor and the compressor is disposed above the evaporator. .

[0017] The refrigerator of the present invention has a compressor disposed on the top of the refrigerator, and prevents oil from flowing out when the refrigerator is laid down on the suction pipe and evaporator disposed below, so that the amount of oil in the compressor is reduced. It is possible to prevent the oil surface height from being significantly reduced and to secure the supply of oil to the compressor sliding part, further reducing damage to the compressor.

[0018] The refrigerator of the present invention includes a heat insulating box, a refrigeration cycle in which a compressor, a condenser, a decompressor, and an evaporator provided in the heat insulating box are sequentially provided to form a series of refrigerant flow paths, a compression Enclosed in machine Oil. The compressor is an internal low-pressure type and is disposed on the top surface of the heat insulation box, and the evaporator is disposed below the compressor. The suction pipe connecting the compressor and the evaporator is provided with an oil spill prevention trap that prevents the oil from flowing out of the compressor to the evaporator.

[0019] Delivery capacity as well as customer delivery When transporting or moving refrigerators including logistics to the storefront, when the refrigerator is laid on its side, the compressor also lies on its side, and the suction pipe opened inside the compressor Oil flows into the open end of the. However, since an oil outflow prevention trap is provided in the suction pipe in the present invention, the oil does not flow into the inner part of the suction pipe, and the oil flows back from the suction pipe to the evaporator. Will not flow out. As a result, the oil spill prevention trap can prevent oil from staying in the suction pipe and the evaporator below the compressor even if the refrigerator is raised and installed after transportation.

[0020] Therefore, when the compressor is arranged on the top surface of the refrigerator and when the refrigerator is laid down, the oil is prevented from flowing out to the suction pipe and the evaporator disposed below the compressor, so the amount of oil in the compressor is reduced. It is possible to prevent the oil surface height from being significantly reduced and to secure the oil supply to the compressor sliding part, further reducing damage to the compressor.

[0021] In addition, since the internal volume of the suction pipe can be increased, the pressure loss is reduced by expanding the inner diameter, and the refrigeration effect is increased by extending the pipe length and increasing the heat exchange length with the fly. Can save energy.

[0022] Further, in the refrigerator of the present invention, the heat insulating box has a recessed portion at the rear of the top surface, and the recessed portion includes a compressor and an oil outflow prevention trap.

[0023] Thus, when the refrigerator is laid down and carried by transporting or moving the refrigerator, even if the compressor is provided at the rear of the top where the inclination of the compressor becomes larger, the oil spills out. The prevention trap can prevent oil from staying in the suction pipe and the evaporator below the compressor.

[0024] Further, in the refrigerator of the present invention, the oil spill prevention trap prevents the oil from flowing out to the evaporator side as well as the compressor inside when the front side of the heat insulation box is tilted up. .

[0025] This makes it possible to carry or relocate the refrigerator so that the door on the front side of the refrigerator is turned upside down. In this case, oil outflow can be prevented even if the compressor power is used.

[0026] Further, in the refrigerator of the present invention, the oil spill prevention trap has a U-bend portion obtained by bending a pipe into a U shape in the front-rear direction of the heat insulating box. At least a part of the U-bending part is arranged on the front side of the heat insulation box from the center line of the compressor, and at least a part of the suction pipe is arranged on the front side of the heat insulation box from the center line of the compressor. The

[0027] If the front door of the refrigerator faces sideways or downward, the door will open naturally, making it unsafe for the transporter, and preventing problems such as falling of internal parts and stored items. In addition, refrigerators are often transported and relocated using refrigerator handles provided on the back and bottom of the refrigerator. When such refrigerators are transported or relocated, the refrigerator can prevent oil spillage when it is laid down with its front door facing up.

That is, when the compressor is laid down in this way, the oil outflow prevention trap provided in the front-rear direction of the heat insulating box of the suction pipe becomes a vertical pipe trap. Therefore, even if oil flows into the open end of the suction pipe opened inside the compressor, at least the U-bending portion of the suction pipe provided above the center of the compressor prevents oil from flowing out.

[0029] Furthermore, the piping U-bending portion becomes an elastic portion, and vibrations can be mitigated.

[0030] Further, the refrigerator of the present invention is provided with an oil spill prevention trap provided in the suction pipe inside the compressor shell. In this way, when the refrigerator is carried over on its side, it is possible to prevent backflow of oil and to reduce the piping storage space in the recessed portion of the heat insulating box provided with the compressor. Energy saving is possible by increasing the thickness of the insulation wall. Furthermore, if the suction pipe is connected directly to the muffler for silencing provided in the refrigerant suction path inside the compressor, and the muffler is configured as an oil spill prevention trap, it will warm up due to the thermal effects of the compressor components. The refrigerant gas is sucked directly from the suction pipe without sucking the refrigerant gas, so that efficiency is improved and energy saving is achieved.

[0031] Further, in the refrigerator of the present invention, the oil spill prevention trap provided in the suction pipe is a chamber in which the evaporator connection side protrudes from the upper side and the compressor connection side is connected from the lower side. It is. In this way, a pipe trap can be formed without requiring a space required for pipe bending, and oil return during normal operation is not hindered. [0032] Further, in the refrigerator of the present invention, the oil spill prevention trap provided in the suction pipe is disposed at the front side of the heat insulating box with respect to the center line of the compressor, at the connecting portion between the compressor and the suction pipe. In this way, using the refrigerator handle provided on the back or bottom of the refrigerator, the refrigerator can be easily transported or moved so that the front door is on its side so that the front door is up. Oil spill can be prevented.

[0033] That is, when the compressor is laid down in this way, the connection portion of the suction pipe is above the center of the compressor. Accordingly, since the open end of the suction pipe opened inside the compressor is located above the oil surface, oil outflow can be prevented.

[0034] Further, in the refrigerator of the present invention, the internal low-pressure compressor includes an upper shell and a lower shell that are divided into upper and lower parts. After the components are housed inside, the upper shell and the lower shell are hermetically sealed at the shell joint, and the pipe riser is located above the shell joint in the suction pipe provided on the lower shell side. Is provided. In this way, it is possible to reduce the height of the compressor, and it is possible to eliminate the decrease in the tolerance to fluctuations in the oil level at the rise of the pipe, so that the recessed portion of the heat insulation box Can be reduced in size to increase the internal volume and downsize the refrigerator compartment.

[0035] In the refrigerator of the present invention, the internal low-pressure compressor is provided with a means for preventing the inclination of the internal components. By doing this, even if the compressor is tilted on its side when transporting the refrigerator, the internal components are prevented from tilting, and the volume of the refrigeration oil that has moved to the tilt side is prevented from being compressed, thus ensuring a space. As a result, it is possible to prevent the refrigeration oil from easily flowing out of the suction pipe.

[0036] Further, in the refrigerator of the present invention, the internal low-pressure compressor includes an upper shell and a lower shell that are divided into upper and lower parts, and after the components are stored inside, the upper shell and the lower shell are connected to the shell joint portion. It is hermetically sealed. The suction pipe provided on the lower shell side opens into the compressor almost on the same plane as the inner wall of the lower shell. Even if the compressor is equipped with a suction pipe so that the oil is more likely to flow out of the suction pipe when the compressor is tilted, it can be placed below the compressor even if the refrigerator is raised after transportation. Oil can be prevented from staying in certain suction pipes and evaporators.

[0037] In the refrigerator of the present invention, a refrigerant is enclosed in the refrigeration cycle. The refrigerant is in a liquefied state In this state, the specific gravity is lighter than the oil sealed in the compressor. Even if the compressor uses a combination of refrigerant and oil that makes it easier for oil to flow out when the compressor is tilted, even if the refrigerator is raised and installed after transportation, it will be below the compressor. Oil can be prevented from staying in a certain suction pipe and evaporator.

[0038] In the refrigerator of the present invention, the refrigerant enclosed in the refrigeration cycle is R600a, and the oil enclosed in the compressor uses mineral oil. This increases the volumetric flow rate of the refrigerant per unit time, so it is approximately twice as high as the flow velocity in the pipe when the refrigerant passes through the refrigeration system, approximately 20 times that of CO. It increases to. Therefore, refrigeration system

2

It is possible to quickly return the oil staying in the compressor to the inside of the compressor, and to prevent a shortage of oil in the shell.

[0039] In the refrigerator of the present invention, the electric element is an inverter electric motor using a permanent magnet for the rotor, and the bearing portion of the compression element is fitted into the height range of the rotor of the electric element. Thus, the size in the height direction can be reduced with the components other than the portion supporting the internal components composed of the electric element and the compression element.

[0040] Accordingly, the internal portion of the oil other than the support portion can be reduced by reducing the height by using the compression element and the electric element without incorporating the support portion supporting the compression element and the electric element as an element for reducing the height. It does not cushion with the parts, and oil level fluctuations are less likely to occur, and oil outflow from the suction pipe can be suppressed.

[0041] Further, the refrigerator of the present invention includes a heat insulating box provided with a recess at the back of the top surface, an internal high-pressure compressor disposed in the recess, and a condenser provided on the top surface of the heat insulating box. And have. The compressor and the condenser are connected by a discharge pipe, and the condenser is arranged on the front side and at a position higher than the discharge pipe connection portion of the compressor.

[0042] Thereby, when the refrigerator is laid down, the compressor also lies down, and the oil flows into the open end of the discharge pipe opened inside the compressor. However, due to its own weight toward the directly connected condenser, Oil does not spill. If a large amount of oil flows into the condenser, the condensing pipe and the downstream girder will block the oil and hinder the circulation of the refrigerant, so that it is possible to prevent a significant drop in performance and reliability.

[0043] In addition, a compressor is disposed on the top of the refrigerator, and a suction pipe and steam disposed below. Prevents oil from flowing out when the refrigerator is laid down on the generator, etc., so that the amount of oil in the compressor can be secured and the oil surface height can be prevented from being greatly reduced, and the oil supply to the compressor sliding section can be secured. Further, damage to the compressor can be further reduced.

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

[0045] (Embodiment 1)

FIG. 1 is a schematic cross-sectional view of the refrigerator according to Embodiment 1 of the present invention, FIG. 2 is a schematic rear view of the refrigerator according to the same embodiment, and FIG. 3 is a schematic component development view of the refrigerator according to the same embodiment. 4 is a schematic perspective view of the main part of the suction pipe of the refrigerator in the same embodiment, FIG. 5 is a schematic sectional view of the compressor mounted on the refrigerator in the same embodiment, and FIG. The schematic sectional drawing of the conveyance state of the refrigerator in embodiment is shown, FIG. 7 has shown schematic sectional drawing of the compressor at the time of refrigerator conveyance in the embodiment. The same components as those in the background art are denoted by the same reference numerals.

[0046] In FIGS. 1 to 4, the heat insulating box 1 is foam-filled in a space formed by 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. Yes It has a heat insulation wall made by injecting heat insulation 15. The heat insulator 15 is made of, for example, hard urethane foam, phenol foam, styrene foam, or the like. It is better to use high-mouth carbon cyclopentane as the foam material from the viewpoint of preventing global warming.

[0047] The heat insulation box 1 is divided into a plurality of heat insulation sections, and has a structure in which an upper part is a revolving door type and a lower part is a drawer type. From the top, there are a refrigerated room 2, a drawer-type switching room 16 and an ice making room 17 arranged side by side, a drawer-type vegetable room 3, and a drawer-type freezer room 4. Each heat insulation compartment is provided with a heat insulation door via 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 room drawer door 6, and the freezer compartment drawer door 7.

[0048] The refrigerating compartment rotary door 5 is provided with a door pocket 21 as a storage space, and a plurality of storage shelves 22 are provided in the refrigerator. A storage case 23 is provided at the bottom of the refrigerator compartment 2.

[0049] The outer box 14 of the heat insulating box 1 is a shell 2 obtained by U-bending a steel plate whose top surface is cut off. 4, bottom panel 25, back panel 26, and machine room panel 28, which forms a recess 27 recessed in the rear of the top surface, are assembled and secured to ensure sealing performance! The machine room panel 28 is formed by drawing a steel plate, and the corner portion has an R shape to improve workability. This R shape secures a flow path at the branching or joining portion of the heat insulating body 15 to be filled with foam, improving the fluidity, and preventing voids due to insufficient filling.

[0050] It should be noted that the flow path of the branching or confluence portion of the heat insulating body 15 to be foam-filled is ensured even if the machine room panel 28 has a narrowed shape as it goes to the left and right ends where the arrangement portion of the compressor 11 is deepest. Fluidity is improved.

[0051] Furthermore, since the machine room panel 28 is made by drawing, there are fewer sealing portions for foam filling, which is advantageous in terms of man-hours. In addition, if a similar shape is formed by sheet metal processing, the cost of the drawing die can be reduced, and it is possible to improve the finish and dimensional accuracy without drawing wrinkles.

[0052] Further, the machine room panel 28 is provided with a plurality of air vent holes (not shown) on each surface, and it is possible to prevent generation and deformation of voids due to residual air without impairing the appearance and the inside view. I'll do it.

[0053] Further, the bottom panel 25 and the back panel 26 are provided with handles made of depressions that can be hooked with fingertips. The bottom handle 29 is provided at two positions at a predetermined interval so that the front fingertip can be applied at a position from the front to the center of the bottom. The rear handle 30 is provided at a predetermined interval at two positions so that the fingertip can be applied upward as high as possible at the top of the rear panel 26.

[0054] Further, the inner box 13 has a configuration in which the rear back part, which is slightly smaller than the outer box 14, is recessed inward, and the heat insulator 15 is foam-filled by being incorporated in the outer box 14. Is formed in the heat insulation box 1. Therefore, the left and right parts of the machine room panel 28 are also filled with the heat insulator 15 to form a heat insulation wall, thereby ensuring strength. Furthermore, the bottom handle 29 and the back handle 30 are also secured by the foam-filled insulation 15.

[0055] Further, the refrigeration cycle includes a compressor 11 elastically supported in the recess 27, a machine room fan 31 provided in the vicinity of the compressor 11, a top surface, a recess 27 and a bottom panel of the shell 24. 25 bottom Cooling on the back of the vegetable compartment 3 and freezer compartment 4, a condenser (not shown) provided on the side of the head and the shell 24, a chiller 32, a dryer for removing water (not shown) The evaporator 9 provided with the fan 8 disposed in the vicinity thereof and the suction pipe 33 are connected in a ring shape.

[0056] The recess 27 is provided with a top cover 34 fixed with a screw or the like. The compressor 11 and the condenser (not shown) provided in the recess 27, a machine room fan, dryer, piping, etc. Is stored.

[0057] The capillary 32 and the suction pipe 33 are copper pipes of approximately the same length, and are soldered so that heat exchange is possible with the end portions remaining. The Cabilari 32 uses a small-diameter copper tube with a large internal flow resistance for decompression, and its inside diameter is about 0.6 to 1. Omm, and the amount of decompression is designed by adjusting with the length. The suction pipe 33 uses a large-diameter copper pipe to reduce pressure loss, and its inner diameter is designed with a 6.35mm force of about 7.94mm. In addition, in order to secure the length of the heat exchange section 35, it is meandered to be compact and arranged in the middle of the inner box 13 and the rear panel 26 so that the meandering section comes to the back of the refrigerator compartment 2. It is buried in the heat 15. One end of the carriage 32 and the suction pipe 33 is connected to the evaporator 9 protruding from the vegetable compartment 3 rear position of the inner box 13, and the other end is provided at the side of the machine room panel 28. It protrudes upward from a notch (not shown) and is connected to a dryer (not shown), a condenser and a compressor 11 respectively.

[0058] It should be noted that since the rear force piping of the vegetable room 3 having a relatively high temperature is taken in and out of the cabinet, the influence of increasing the amount of heat intruding due to the putting in and out of the piping is effective in saving energy.

In addition, an oil outflow prevention trap 36 is provided in the vicinity of the connection portion with the compressor 11 in the suction pipe 33 and is accommodated in the recess 27. With the aim of improving the assembly workability and service workability, the pipe connection part of the compressor 11 faces the rear side in order to reduce the density of the pipes and to make the rear force pipe connection visible. Thus, they are arranged on the left and right sides of the compressor.

[0060] The suction pipe 33 has a rear lower side force of the compressor 11 that is straight and has a slight upward slope on the side, and then is substantially higher in the vertical direction than the vertical center line of the compressor 11 and the compressor 11 11 high The rising portion is provided to a position lower than the above. In order to minimize the dent 27 and minimize the bulge into the refrigerator compartment, it is necessary to reduce the size of the compressor 11 and the space between the compressor peripheral wall as much as possible. Setting the pipe height below the height of the compressor 11 can prevent the wall surface of the pipe from contacting.

[0061] Further, the suction pipe 33 is provided with an oil spill prevention trap 36 composed of a pipe U-bending portion 37 provided in the front direction of the heat insulating box 1 after rising up in the vertical direction. The tip of the portion 37 is located on the front side of the heat insulating box 1 with respect to the center line in the plane direction of the compressor 11. Since the compressor 11 has a shape with a curvature toward the top surface, if the pipe bending part 37 is configured above the compressor 11, there is a sufficient space and a small space does not take up the pipe storage space. Is possible. In addition, by providing piping U-bending portion 37, the elasticity of the piping can be provided, and the vibration propagation of 11 forces of the compressor can be absorbed, stress concentration at the piping fixing portion can be prevented, and piping damage can be reduced.

[0062] After the U-bending, the suction pipe 33 is bent in a substantially vertical direction and embedded in the heat insulator 15 such as the rear end of the machine room panel 28.

Next, the internal structure of the compressor 11 will be described.

[0064] In FIG. 5, the compressor shell 40 is an overlapped part of a combination of a bowl-shaped lower shell 38 and a reverse bowl-shaped upper shell 39 formed by deep drawing a thick steel plate of 2 to 4 mm. It is a sealed structure in which the periphery of a shell joint 40a is welded. The compressor shell 40 includes a rotation drive unit 42 and a compression unit 43 that are elastically supported by an elastic body 41 inside. Compressor shell 40 is connected to other equipment that constitutes the refrigeration cycle with suction pipe 33 with its end open and discharge pipe 44, and contains a predetermined amount of oil 45 and refrigerant (not shown) It has been done. Further, a support portion 46 for elastically supporting the heat insulating box 1 is attached to the lower portion of the lower shell 38. The support portion 46 is provided with a relief for securing the thickness of the elastic support member by one step.

The rotation drive unit 42 includes a motor 47 and a bearing unit 48. The motor 47 has a stator 49 having a hollow cylindrical electromagnetic coil that generates a rotational force with a permanent magnet when a voltage is applied, and a permanent magnet that is located in a hollow portion inside the stator 49 and is opposed by a minute gap. Rotor 50. The bearing part 48 has an eccentric shaft 51 at its end, The shaft 52 is composed of an open hollow, a shaft 52 provided with a spiral groove (not shown) in the periphery thereof, and a jet hole that communicates with the inside, and a bearing 53 that rotatably holds the shaft 52.

[0066] The compression unit 43 is attached to a cylinder 55 provided with a cylinder head 54 provided with a valve mechanism (not shown) at the tip, a piston 56, a piston 56, and an eccentric shaft 51 so as to be swingable. It consists of a rod 57 that converts motion to linear reciprocating motion. A discharge pipe 44 is connected to the cylinder head 54 via a valve mechanism so that the compressed refrigerant is discharged directly to the outside of the compressor shell 40. The suction part is opened inside the compressor shell 40 via a valve mechanism. In order to mute the sound, a suction muffler (not shown) is disposed between the suction path of the cylinder head 54 and the compressor shell 40 for the suction path.

[0067] Note that the suction pipe 33 is arranged so that the opening end thereof is flush with the inner wall surface of the compressor shell 40, so that the compressor 11 is downsized.

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

[0069] First, the temperature setting and cooling method of each heat insulation section will be described. Refrigeration room 2 is usually set at 1 ° C to 5 ° C, with the lower limit being the temperature at which it will not freeze for refrigerated storage. The storage case 23 is set at a relatively low temperature, for example, 3 ° C. to 1 ° C. for improving the freshness of meat fish and the like.

[0070] The temperature setting of the switching chamber 16 can be changed by a user setting, and can be set to a predetermined temperature from the freezer compartment temperature zone to the refrigeration and vegetable compartment temperature zones. In addition, the ice making chamber 17 is an independent ice storage chamber and is equipped with an automatic ice making device (not shown) to automatically produce and store ice. Although it is a freezing temperature zone for storing ice, it can be set at a freezing temperature that is relatively higher than the freezing temperature zone because it is intended to preserve ice. is there

[0071] The vegetable room 3 is often set to 2 ° C to 7 ° C, which is set at a temperature that is equal to or slightly higher than that of the refrigerator room 2. It is possible to maintain the freshness of leafy vegetables for a long time as the temperature is lowered so that it does not freeze.

[0072] The freezer compartment 4 is usually set at a temperature between -22 ° C and -18 ° C for freezing storage. For example, a low temperature of -30 ° C or -25 ° C can be used to improve the state of refrigeration. It may be set by.

[0073] Each chamber is partitioned by insulating walls to efficiently maintain different temperature settings Power As a method for improving heat insulation performance at low cost, it is possible to perform foam filling with the heat insulator 15 integrally. Compared to using a heat insulation member such as polystyrene foam, the heat insulation performance can be doubled, and the storage capacity can be increased by making the partition thinner.

[0074] 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 according to the set temperature in the chamber. A voltage is applied from the terminal (not shown) through the electric wire to the motor 47 of the rotary drive unit 42 in the compressor 11 in accordance with the instruction of the cooling operation.

[0075] When the motor 47 is operated, the electromagnetic coil of the stator 49 is excited to generate a rotational force with the rotor 50 having a permanent magnet. The rotation of the rotor 50 causes the shaft 52 fixed to the rotor 50 to rotate synchronously in the bearing portion 48, and the eccentric shaft 51 also rotates eccentrically. The piston 56 reciprocates in the cylinder 55 through a rod 57 that is swingably provided by the rotation of the eccentric shaft 51.

Thereby, the compression operation of the refrigerant gas is performed in the compression unit 43. That is, when the piston 56 moves to the position farthest from the cylinder head 54, the pressure in the cylinder 55 decreases, and the valve mechanism (not shown) of the suction portion provided in the cylinder head 54 is opened. The refrigerant gas in the compressor shell 40 is sucked into the cylinder 55 via a muffler muffler (not shown). Next, when the piston 56 moves to the position closest to the cylinder head 54, the sucked refrigerant gas is compressed to become high-temperature and high-pressure refrigerant gas via the valve mechanism in the discharge part of the cylinder head 54. Discharged. The discharged refrigerant gas is sent out of the compressor shell 40 through a discharge pipe 44 directly connected to the cylinder head 54.

[0077] As described above, the compressor shell 40 has an internal low-pressure type configuration in which low-pressure refrigerant gas exists, and the refrigerant gas that returns to the suction pipe force is released into the compressor shell 40.

[0078] The sliding portion 58 existing in the bearing portion 48 and the compression portion 43 of the compressor 11 is secured with lubricity by the oil 45. In addition, a compatible combination of oil 45 and refrigerant gas has been selected. A combination of Rl 34a and ester oil, which has a low ozone depletion potential, and a high-mouth carbon system that has a low global warming coefficient and good environmental protection. There are combinations of refrigerant HC600a and mineral oil. [0079] In addition, the oil 45 is sealed in the compressor shell 40, and the amount of the oil 45 is determined so as to be stored in the lower part and to secure a predetermined oil surface height. Supply of the oil 45 to the sliding portion 58 is performed through the hollow interior of the shaft 52 by the centrifugal force generated by the rotation of the shaft 52. The lower end of the shaft 52 is completely attached to the oil 45, and this force is also blown from an ejection hole (not shown) provided at a position corresponding to each part of the sliding portion 58. It is attached. Furthermore, the supply of the oil 45 to the sliding portion 58 can be sufficiently spread by the spiral groove around the shaft 52.

[0080] The high-temperature and high-pressure refrigerant discharged by the operation of the compressor 11 as described above dissipates heat in the condenser (not shown), condenses and liquefies, and is depressurized by the cavity 32 to become a low-temperature and low-pressure liquid refrigerant. To evaporator 9.

[0081] By the operation of the cooling fan 8, heat is exchanged with the air in the cabinet, the refrigerant in the evaporator 9 is evaporated, and the low-temperature cold air that has been heat-exchanged is distributed by a damper (not shown) or the like. Each room is cooled.

The refrigerant that has left the evaporator 9 is sucked into the compressor 11 through the suction pipe 33. At this time, the suction pipe 33 is soldered so as to be capable of exchanging heat with the capillaries 32 and is embedded in the heat insulator 15, so that heat is transferred from the low-temperature suction pipe 33 to the high-temperature capillaries 32 without escaping from the surroundings. . Since Cabilary 32 is cooled during the process of reducing the refrigerant pressure, the specificentalbi decreases and the refrigeration effect increases. In the suction pipe 33, the refrigerant temperature rises and can be made to be approximately equal to or higher than the ambient temperature at the outlet. Since the refrigerant temperature in the suction pipe 33 rises, the heat loss in the process of being sucked into the compressor 11 is small, and the efficiency is improved. The refrigeration cycle that generates the refrigeration temperature is extremely low, with the refrigerant temperature in the evaporator 9 being 20 ° C or less, so the effect of reducing heat loss is particularly great.

[0083] In addition, since the firefly 32 is relatively hot, if it is placed in a low temperature part, heat will be dissipated in addition to heat exchange with the suction pipe 33, resulting in heat loss in the refrigeration cycle and heat load in the cabinet, saving energy. Will be reduced. However, because the exhaust 32 and the suction pipe 33 are arranged on the back of the refrigerator compartment 2 where the internal temperature is high, it is possible to secure energy savings without greatly increasing heat loss and heat load on the internal storage. In particular, the heat exchanger 35 has a sufficient length, and is meandering behind the refrigerator compartment 2 for compact storage. And sufficient temperature rise of the suction pipe 33 can be obtained. Since the meandering portion has an ascending slope and no trap, the liquid refrigerant does not cause refrigeration oil to stay and does not cause performance effects such as pressure loss.

[0084] When transporting or relocating a refrigerator that operates as described above, as shown in Fig. 6, multiple people such as four people can use the bottom handle 29 and the back handle 30 provided on the bottom panel 25 and the back panel 26. It is supposed to be transported by.

[0085] The weight of the refrigerator has increased due to the increase in the number of additional parts accompanying the increase in the internal volume and the increase in functionality and the increase in density for energy saving! / And the increase in the amount of vacuum insulation used. It is increasing. In addition, refrigerators with external dimensions of nearly 1800 mm are the mainstream, and the width and depth are about 600 mm and 750 mm, making it very important to devise transportation.

[0086] When the refrigerator is delivered to the customer, it is necessary to carry it in a sideways manner! /, Tsuteyo! /, So there are handles on the bottom and upper back. In addition, refrigerators are often laid down and transported just before the power is turned on, such as moving or changing the pattern just during delivery.

[0087] With these handle configurations, the refrigerator can be transported with the door surface facing upward, and the door is opened unexpectedly during transportation, making it unstable for the transporter, and the internal parts and stored items fall. It is possible to prevent problems such as

At this time, as shown in FIG. 7, the inside of the compressor 11 provided in the recess 27 on the top surface has an open end of the suction pipe 33 opened in the compressor shell 40 in the oil 45. As a result, the intake pipe 33 can be backflowed out. However, since the oil spill prevention trap 36, which also has the force of the pipe U-bend 37, rises upward from the staying surface of the oil 45 during transportation, the oil 45 flows into the suction pipe 33 and the evaporator 9 There is nothing to do. At the time of re-installation after transportation, the oil 45 in the oil spill prevention trap 36 returns to the compressor shell 40 by gravity and does not leave the suction pipe 33 closed with the oil 45.

In this way, the oil outflow prevention trap 36 is provided in the recess 27 on the top surface together with the compressor 11, and further, the oil flows into the open end of the suction pipe 33 opened in the compressor 11. When it is tilted at a slight angle, it prevents oil from flowing out of the compressor 11 and the evaporator 9 side. Therefore, even when the refrigerator is started after being tilted by transportation or the like, it hardly flows out into the suction pipe outside the recess 27 on the top surface. Further, it is possible to prevent the oil from flowing backward from the suction pipe 33 to the evaporator 9.

[0090] As described above, the oil spill prevention trap 36 causes the oil that has flowed into the oil spill prevention trap 36 to return to the compressor 11 even when the refrigerator is raised after being tilted by transportation or the like. It is possible to prevent oil from staying in the suction pipe and evaporator located below, to eliminate the shortage of oil in the compressor 11, and to ensure oil supply to the compressor sliding parts, etc. Damage and the like can be further reduced.

[0091] From this, a predetermined amount of oil 45 in the compressor shell 40 is secured, and there is a shortage of oil supply to the sliding portion 58, especially when the power is turned on for the initial start of the compressor 11, Since insufficient oil supply can be prevented, a highly reliable refrigerator that can further reduce damage to the compressor 11 and the like can be provided.

[0092] In order to minimize the inside of the recess 27, the condenser may be thin and disposed on the top surface. Alternatively, the compressor 11 and the machine room may be placed in the recess 27 as a box-shaped configuration. The fan 31 may be arranged in parallel in order to secure the internal volume in the vertical direction. In addition, if the condenser has a fin tube type, a wire tube type, a spiral fin tube type, etc., and the heat radiation capacity is increased by increasing the external surface area, it will be effective in reducing the size of the condenser and increasing energy consumption.

[0093] Further, the condenser may be a natural air cooling type composed of copper piping adhered to the inner side of the outer box 23 with only a forced air cooling type with good heat transfer! In addition, copper piping may be combined to prevent drip-proofing by arranging in the partition between the heat insulating door bodies in each room.

[0094] When HC600a is used as the refrigerant, the volume of the refrigerant gas increases and the volume flow rate increases, so the flow rate of the heat exchange section also increases, which promotes heat transfer and increases the temperature of the suction pipe 33 and staggers 32 The effect of improving the refrigeration effect due to the cooling of the oil is improved, and the compatibility with the refrigerant is large, and the gas flow rate is also large. Therefore, the circulation of the oil 45 is good, which is advantageous in terms of ensuring reliability.

[0095] It should be noted that the flow path control means such as the electric three-way valve and the electric expansion valve are used to define the partition configuration and Use more than one evaporator according to the temperature setting configuration, switch between multiple cavities, control the amount of pressure reduction, cut the gas while the compressor 11 is stopped, etc. to further save energy Can do. In particular, by providing the flow path control means in the recess 27 on the top surface of the heat insulating box 1, the heat load on the inside of the cabinet can be reduced, and further energy saving effect is obtained.

[0096] Although the rear handle 30 for carrying the refrigerator is provided below the recess 27 where strength is easily secured, if the rear handle 30 is provided at both sides of the control board at the center, It can be arranged efficiently and has the effect of expanding the internal volume. In addition, if the rear handle 30 is provided by allocating it to the left and right above the top cover 34, the installation shape of the compressor 11 can be escaped and the shape of the handle can be configured. There is an effect that it is easy to hold because it will hold the part. By providing the bottom handle 29 at the front end of the bottom surface as well, the corner portion can be gripped and the ease of holding can be improved.

[0097] If the side surface of the recess 27 of the heat insulating box 1 is composed of only the power shell 24 having the left and right wall surfaces made of the heat insulator 15, the heat dissipation of the compressor 11 is improved, and the recess 27 is disposed in the recess 27. It is possible to make a large part space.

Further, in the present embodiment, the compressor 11 is provided in the recess 27 at the rear of the top surface of the heat insulating box 1. However, even if the top surface of the heat insulation box 1 is not provided with a recess or the like and the compressor 11 is provided on the substantially flat top surface, the refrigerator 9 is located below the compressor 11 in a refrigerator of the type. Similarly, oil is prevented from flowing out to the suction pipe 33 and the evaporator 9 disposed below the compressor 11 when the container is laid down by transporting the refrigerator. Therefore, the amount of oil in the compressor 11 can be secured and the oil surface height can be prevented from being greatly reduced, the oil supply to the sliding portion of the compressor 11 can be secured, and damage to the compressor 11 can be reduced. it can.

[0099] (Embodiment 2)

FIG. 8 shows a schematic cross-sectional view of a compressor mounted on the refrigerator according to Embodiment 2 of the present invention. In addition, the same code | symbol is attached | subjected about the same structure as background art.

[0100] In FIG. 8, the suction pipe 33 is provided with a rising force S in the compressor shell 40 toward the upper part of the compressor, and the pipe end is bent in the lateral direction at the upper part so that the open end is in the center It is structured towards. In this way, the oil spill prevention trap 36 provided by the configuration of the suction pipe 33 allows the refrigerator 11 to be carried around while the refrigerator 11 is laid down. The open end is not submerged in the oil 45 and backflow outflow can be prevented.

[0101] Therefore, since the compressor 11 is arranged on the top of the refrigerator, the oil pipe 45 is prevented from flowing out when the refrigerator is laid down on the suction pipe 3 3 and the evaporator 9 arranged below, so that the compressor shell 40 Oil 45 can be secured, and sufficient oil supply to the sliding portion 58 is possible, further reducing damage to the compressor and the like.

[0102] Further, since the oil 45 does not flow backward, the suction pipe 33 connected to the compressor 11 can be directly embedded in the heat insulating body 15, and the piping storage space of the recess 27 of the heat insulating box 1 can be reduced. Energy saving can be achieved by increasing the internal volume of the cabinet and increasing the thickness of the heat insulating wall.

[0103] Note that if the suction pipe is directly connected to the muffler for silencing provided in the suction gas path inside the compressor shell 40, and the oil flow prevention trap is configured in the muffler internal path, the compressor configuration Since the refrigerant gas is directly sucked without sucking the refrigerant gas heated by the heat effect of the parts, the efficiency is improved and further energy saving can be achieved.

[Embodiment 3]

FIG. 9 shows a schematic perspective view of the main part of the suction pipe of the refrigerator in the third embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the same structure as background art.

In FIG. 9, an oil spill prevention trap 36 provided in the recess 27 of the heat insulation box 1 is a first suction pipe 33 a connected from the evaporator 9 and a second suction connected to the compressor 11. It consists of piping 33b and chamber 59. The chamber 59 has an outer shape of 20 mm to 4 Omm whose diameter is larger than each of the suction pipes 33a and 33b provided between the first suction pipe 33a and the second suction pipe 33b. The first suction pipe 33a is also inserted with the upper force of the chamber 59, and the pipe protrudes inside to provide an open end. The second suction pipe 33b is also inserted with the lower force of the chamber 59, and is arranged so that the open end of the pipe is flush with the wall surface inside the chamber 59.

[0106] Thus, when carrying the refrigerator with the refrigerator lying down, When the oil 45 moves and the open end of the second suction pipe 33b is submerged in the oil 45, the oil 45 flows out into the chamber 59. However, since the outflow to the first suction pipe 33a is prevented by the pipe structure in the chamber 59, when the refrigerator is installed again, the oil is returned to the compressor 40 and the necessary amount is secured.

Therefore, since the compressor 11 is arranged on the top surface of the refrigerator, the oil 45 is prevented from flowing out when the refrigerator is laid down on the first suction pipe 33a and the evaporator 9 arranged below, so that the compressor shell Oil 45 in 40 can be secured, and sufficient oil supply to the sliding portion 58 is possible, further reducing damage to the compressor and the like.

[0108] It should be noted that if the pipe into which the lower force is inserted protrudes inside and an oil return hole is provided in the vicinity of the lower end of the inner surface of the chamber 159, oil stays in the chamber 159 and liquid refrigerant is prevented. It is possible to provide a buffering mechanism that can be stored temporarily and prevented from being directly sucked into the compressor 11 in response to a transient return of the compressor 11, preventing liquid compression of the compressor, and further damaging the compressor. Can be reduced.

[Embodiment 4]

FIG. 10 shows a schematic perspective view of the main part of the suction pipe of the refrigerator according to the fourth embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the same structure as background art.

In FIG. 10, the oil spill prevention trap 36 has a connecting portion 60 between the compressor 11 and the suction pipe 33 arranged on the front side of the heat insulating box 1 with respect to the center line of the compressor 11. The suction pipe 33 is provided with a slight upward slope from the compressor connection part 60 and extends in the lateral direction to provide a force rising in the substantially vertical direction, and is then provided with a U-bend so as to be embedded in the heat insulator 15 on the back side. Yes.

[0111] Thus, when carrying the refrigerator with the refrigerator lying down, even if the oil 45 moves due to the compressor 11 lying down, the inlet end of the suction pipe 33 is on the top side of the compressor 11 and the oil 45 Backflow outflow can be prevented without being submerged.

[0112] Accordingly, since the compressor 11 is arranged on the top surface of the refrigerator and the oil 45 is prevented from flowing out when the refrigerator is laid down on the suction pipe 33, the evaporator 9, etc. arranged below, the compressor shell 40 Oil 45 can be secured, and sufficient oil supply to the sliding portion 58 is possible, further reducing damage to the compressor and the like. [0113] Further, since the welding connection portion 61 with the suction pipe 33 is provided in the back vertical portion of the suction pipe 33, the pipe welding work can be easily performed.

[0114] (Embodiment 5)

11 and 12 show schematic perspective views of main portions of the suction pipe of the refrigerator in the fifth embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the same structure as background art.

[0115] In FIG. 11, the suction pipe 33 is provided with a slight upward slope on the lower side of the rear side of the compressor 11 and is made to go straight, and then is substantially vertically higher than the vertical center line of the compressor 11. In addition, the rising portion is provided to a position lower than the height of the compressor 11. In order to minimize the recess 27 and minimize the protrusion into the refrigerator compartment, it is necessary to reduce the size of the compressor 11 and make the space between the compressor peripheral wall as small as possible. By setting the pipe height below the height of the compressor 11, it is possible to prevent the wall contact of the pipe.

[0116] Further, after the vertical startup, the suction pipe 33 is arranged so that it surrounds the periphery of the compressor 11, so that at least three sides are arranged so as to straddle the center line of the compressor 11 to form an oil spill prevention trap 36. Yes. The pipe U-bend tip is located on the front side of the heat insulation box from the plane center line of the compressor 11. Since the compressor 11 has a shape with a curvature toward the top surface, if the pipe bending portion 37 is formed above the compressor 11, there is a space, and the pipe storage space is not taken up and the size is small. Is possible. In addition, the length of the suction pipe 33 in the recess 27 can be secured, so the pipe can be made elastic, absorb vibration propagation from the compressor 11, prevent stress concentration at the pipe fixing part, and reduce pipe damage. it can.

[0117] The suction pipe 33 is bent in a substantially vertical direction after the oil spill prevention trap 36 and is embedded in the heat insulator 15 from the rear end of the machine room panel 28.

[0118] Thus, when carrying the refrigerator with the refrigerator lying down, even if the oil 45 moves due to the compressor 11 lying down, the suction pipe 33 and the evaporator 9 disposed below by the oil spill prevention trap 36, etc. In addition, since oil 45 is prevented from flowing out, oil 45 in compressor shell 40 can be secured, sufficient oil can be supplied to sliding portion 58, and damage to the compressor can be further reduced.

[0119] Regardless of the direction of the refrigerator handle, the refrigerator may be laid down in various directions. Since the pipe trap is provided so as to surround the compressor, the oil 45 can be prevented from flowing out in the same manner as when it is laid down in the rear direction, and there are few restrictions in carrying the refrigerator and the carrying performance is improved.

[0120] If the suction pipe 33 is arranged in the same direction as the connecting portion from the compressor 11 as shown in Fig. 12, an oil outflow prevention trap can be configured to make a full circuit around the compressor 11, and it is difficult to reverse flow out. Can be configured.

[0121] (Embodiment 6)

FIG. 13 is a schematic perspective view of the main part of the suction pipe of the refrigerator in the sixth embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the same structure as background art.

In FIG. 13, the compressor 62 is an internal high-pressure type such as a rotary type, and is disposed in a recess 27 provided at the rear of the top surface of the heat insulating box 1. The discharge pipe 63 from the compressor 62 is open to the inside of the compressor 62, and the suction pipe 64 is directly connected to the suction portion of the compressor 62. A thin condenser 65 is provided on the top surface of the heat insulation box 1 and is connected from the compressor 62 through the discharge pipe 63 with an ascending gradient. Further, the condenser 65 is disposed in front of and higher than the discharge pipe connection 66 of the compressor 62. Further, the downstream portion of the condenser 65 is connected by a connecting portion provided on the rear side of the cavity 32 and the recessed portion 27, so that workability and serviceability are improved.

Note that a dryer (not shown) or the like may be disposed in the vicinity of the connecting portion.

[0124] The condenser 65 is forcibly air-cooled by the machine room fan 31, and the air passage is configured by a top duct cover 67 that also serves as a cover. The top duct cover 67 has a suction opening 68 on the front and side surfaces, and a discharge opening 69 on the rear surface. Further, a partition 70 is provided between the arrangement portion of the condenser 65 and the recess 27. A provided air passage is constructed.

[0125] Thus, when transporting or moving the refrigerator using the handle of the refrigerator, when the refrigerator is turned on its side, the compressor also lies on its side, and the oil pipe 45 opens at the open end of the discharge pipe 63 opened inside the compressor. Flows in. However, the condenser 65 is disposed above, and the oil 45 does not flow out into the condenser 65 due to its own weight.

[0126] If a large amount of oil 45 flows into the condenser 65, this will affect the performance degradation caused by blocking the oil in the condenser 65 piping and the downstream 32 of the capillaries, thus preventing refrigerant circulation. Can be prevented.

[0127] If the discharge pipe 63 is arranged so as to surround the compressor 62 and straddle the center line of at least three compressors 62, the sideways direction of the refrigerator is either direction regardless of the handle. Even oil 45 can be prevented from flowing out.

[0128] It should be noted that there is no problem because the condenser 65 becomes a pipe trap even if a condenser arranged separately on the downstream side of the condenser 65 is connected.

[0129] Note that the use of a rotary type compressor reduces the number of components and is effective for downsizing, and is effective in reducing the size of the inside of the refrigerator compartment and reducing the ineffective volume.

[0130] (Embodiment 7)

FIG. 14 is a schematic cross-sectional view of a compressor mounted on the refrigerator according to Embodiment 7 of the present invention. In addition, the same code | symbol is attached | subjected about the same structure as background art.

[0131] The internal structure of the compressor 100 will be described.

In FIG. 14, the configuration of the compressor 100 is a hermetically sealed structure in which the upper shell 101 and the lower shell 102 are overlapped and welded together, and the rotary drive unit 104 elastically supported by the elastic body 103 inside is compressed. Internal components consisting of part 105 are provided. The compressor 100 is connected to other devices constituting the refrigeration cycle by the suction pipe 106 and the discharge pipe 107, and contains a predetermined amount of oil 108 and a refrigerant (not shown).

[0133] The rotation drive unit 104 includes a motor 109 and a bearing unit 110. The motor 109 includes a stator 111 having a hollow cylindrical electromagnetic coil that is applied with voltage and generates a rotational force between the permanent magnet and a permanent magnet that is located in a hollow portion inside the stator 111 and is opposed to each other with a minute gap. Power with the rotor 112 having.

[0134] Note that, since the compressor 100 is arranged on the top surface, downsizing is advantageous in terms of freedom of arrangement, weight, and effective refrigerator capacity, but there are the following methods for downsizing. When the salient pole concentrated winding type is used for the electromagnetic coil constituting the stator 111, it is possible to concentrate the winding wire densely and reduce the size. Further, the permanent magnet housed in the rotor 112 is a rare earth permanent magnet such as Nd, so the magnetic flux density is about 4 times larger than that of a commonly used bright magnet, so the magnet height is high. Therefore, the compressor 100 can be miniaturized. [0135] In the compressor 100 thus miniaturized, the volume occupied by the internal components as a structure is increased in the compressor internal volume, and the space portion is reduced. When the space becomes smaller, the refrigerator oil surface height rises to compress the volume of the enclosed refrigerator oil, and the refrigerator oil tends to flow backward into the suction pipe with a slight inclination.

[0136] Further, the shaft 134 includes a shaft main shaft portion 134a and a shaft eccentric portion 134b eccentric to the shaft main shaft portion 134a. The bearing section 110 of the shaft main shaft section 134a includes an A bearing 131 that receives a load, and a B bearing 132 that is fixed to the upper shell 101 and acts as a tilt prevention means for internal components during transportation.

[0137] The compression unit 105 is swingably attached to a cylinder 136 provided with a cylinder head 135 having a valve mechanism (not shown) at the tip, a piston 137, a piston 137, and an eccentric shaft 133. It is composed of a rod 138 that converts a rotational motion into a linear reciprocating motion.

[0138] A discharge pipe 107 is connected to the cylinder head 135 via a valve mechanism so that the compressed refrigerant is discharged directly to the outside of the compressor 100. The suction part is opened to the inside of the compressor 100 via a valve mechanism. In particular, a muffler (not shown) is disposed between the cylinder head 135 and the suction pipe 106 in order to mute the sound.

[0139] In the refrigerator having the compressor configured as described above, when it is laid down when the refrigerator is transported, even if the compressor 100 is inclined, it is supported by the B bearing 132 provided in the upper shell 101. Therefore, the internal components such as the rotational drive unit 104 and the compression unit 105 that are elastically supported are not greatly inclined due to the direction toward the wall surface of the lower shell 102. Accordingly, it is possible to prevent the volume of the refrigeration oil that has moved to the inclined side from being pressed and to secure a space, and thus it is possible to prevent the oil 108 from easily flowing out from the suction pipe.

[0140] In this embodiment, the B bearing 132 realizes a bearing structure for preventing the inclination of the internal components. However, the tilt prevention means is such that pins provided on the top surface of the upper shell 101 are fitted to the opening provided at the tip of the shaft 134 at a predetermined interval, or that the tip of the shaft 134 is not tilted. A guide member provided on the outer peripheral side of the shaft 134 on the top surface of the upper shell 101 and a gap with a predetermined interval provided so that the rotation drive unit 104 does not incline more than a predetermined amount, and fixed to the upper shell 101 and the lower shell 102. The same effect can be achieved by using a guide member. Can play.

[0141] (Embodiment 8)

FIG. 15 is a schematic cross-sectional view of the compressor mounted on the refrigerator according to Embodiment 8 of the present invention, and FIG. 16 is a diagram of the inside of the compressor mounted on the refrigerator according to Embodiment 8 of the present invention viewed from above. It is.

[0142] In the figure, the suction pipe 200 inside the compressor 100 is installed on the same plane as the inside of the shell so as not to extend into the compressor of the lower shell 201, and is connected to the suction port 202a of the suction muffler 202. Arranged in close proximity to each other! /

[0143] The reason why the opening in the shell of the suction pipe 200 is arranged almost on the same plane as the inner surface of the shell is to prevent physical buffering of the suction pipe 200 with respect to the internal components in the shell. This is to reduce the size.

[0144] The electric element 203 having the rotor 203a and the stator 203b is elastically supported by the lower shell 201 via a support portion 205 having an elastic member. A compression element 204 is disposed above the electric element 203.

[0145] The refrigeration cycle that includes a compressor 100, a condenser (not shown), a decompressor (not shown), and an evaporator (not shown) in this order to form a series of refrigerant channels has a refrigerant R600a is enclosed. Inside the compressor 100, an oil 210 made of mineral oil having a high mutual solubility with respect to R600a is enclosed.

As described above, in the compressor 100 of the type in which the electric element 203 is disposed below, the rotor 203a of the electric element 203 that rotates in accordance with the operation of the compressor 100 interferes with the oil 210. In this way, it is arranged in consideration of the height of the support part 205 and the mounting position.

[0147] Further, the compression element 204 is formed with a contact portion 220 having a certain clearance from the upper shell (not shown) or the lower shell 201.

Next, details of the compressor 100 will be described below.

[0149] The shaft 240 has a main shaft portion 241 to which the rotor 203a is fixed by press-fitting or shrink fitting, and an eccentric portion 242 formed eccentric to the main shaft portion 241. The cylinder block 250 has a substantially cylindrical compression chamber 251 and a bearing portion 243 for supporting the main shaft portion 241 of the shaft 240, and is formed above the electric element 203. [0150] At this time, the rotor recess 203c is formed on the compression element 204 side of the rotor 203a, and the bearing 243 extends into the rotor recess 203c so that the compression element 204 is electrically connected to the electric element. The miniaturization is realized by inserting in the height range of 203 rotors.

The piston 260 is loosely fitted in the compression chamber 251 and is connected to the eccentric portion 241 of the shaft 240 by the connecting means 261. The rotary motion of the shaft 240 is converted into the reciprocating motion of the piston 260, and the piston 260 expands and contracts the space of the compression chamber 251 so that the refrigerant in the shell is sucked by the suction muffler 202 of the suction muffler 202, and the cylinder head 252 Is discharged to a discharge pipe outside the shell through a discharge muffler 253, a discharge pipe 2 54, and a discharge tube 270 formed in the cylinder block 250 via a valve (not shown) provided inside the cylinder block 250.

[0152] The discharge pipe 254, 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. The discharge tube 270 is connected elastically.

[0153] As the electric element 203, an inverter motor using a permanent magnet for the rotor 203a is used. In conventional induction motors, the torque required for the operation of the compressor 100 is not generated unless the stator 203b and the rotor 203a are thick. However, by using an inverter motor that uses permanent magnets for the rotor 203a, the exciting current required for generating the rotating torque is no longer required, so the stator 203b thickness and the rotor 203a thickness are low. The electric element 203 can be made compact.

[0154] Next, the operation of the compressor 100 will be described.

[0155] When the compressor is energized, a current flows through the terminal 280 and the lead wire 281 to the stator 203b of the electric element 203, and the rotor 203a rotates by the rotating magnetic field generated by the stator 203b. Due to the rotation of the rotor 203 a, the eccentric portion 242 of the shaft 240 connected to the rotor performs a rotational motion that is eccentric from the axis of the shaft 240. The eccentric motion of the shaft 240 is converted into a reciprocating motion by the connecting means 261 connected to the eccentric portion 242 and becomes a reciprocating motion of the piston 260 connected to the other end of the connecting means 261. The refrigerant is sucked and compressed while changing the internal volume.

[0156] The piston 260 sucks and discharges during one reciprocation in the compression chamber 251 is called a cylinder volume, and the cooling capacity changes depending on the size of the cylinder volume. [0157] Next, the case where the refrigerator is tilted by transportation or the like with the compressor stopped will be described.

[0158] If the compressor 100 is not operated for a long time, the R600a becomes liquid and becomes a liquid cooling medium 290, which is stored on top of the oil 210, which is a mineral oil having a higher specific gravity than the liquefied R600a. Is done. As a general-purpose refrigerant in which the liquid refrigerant is stored in the upper part of the oil in a state where the refrigerant is in a liquid state, a combination of a CO refrigerant and ester oil or ether oil is the same.

2

On the other hand, for example, in the case of R134a and ester oil, which are generally used as conventional refrigerants, the vertical relationship between the oil and liquid refrigerant is reversed, the liquid refrigerant is stored in the lower part, and the ester oil is stored in the upper part. The

[0159] In the compressor 100 using a combination of the refrigerant and oil of the type in which the liquid refrigerant 290 is stored in the upper part of the oil 210 as in the present embodiment, the lower shell is tilted when the compressor 100 is tilted. When the oil 210 stored in the lower part reaches the suction pipe 200 that is open on the same plane as the inner wall surface of the 201, the oil 210 inside the shell decreases by easily flowing out of the shell. The oil level will decrease.

[0160] When the oil level is lowered in this way, the amount of oil supplied to the sliding portion of the compression element 204 is reduced, and wear of the sliding portion may occur.

[0161] In response to this problem, the present invention uses R600a, which is a refrigerant whose refrigerating capacity per unit volume is as small as about 1Z2 compared to R134a and about 1Z20 compared to CO.

2

Yes. As a result, in order to obtain the refrigerating capacity equivalent to R134a and CO, the cylinder volume is reduced to R134.

2

Since it is about 2 times larger than a and 20 times larger than CO, the piston push of the compressor

2

The surplus amount also increases in proportion to the increase in cylinder volume. In other words, the volume flow rate of the refrigerant per unit time increases, so that the flow velocity in the piping when the refrigerant passes through the refrigeration system is about twice as high as the flow rate 134a and about 20 times that of CO. So frozen

2

It is possible to quickly return the oil 210 staying in the system to the compressor 100, thereby preventing a shortage of oil in the shell.

[0162] In addition, regarding such a decrease in the oil level of the refrigerator due to transportation of the refrigerator, etc., at least half of the 10 minutes immediately after the compressor is turned on, which is at least half of 5 minutes or more, An inverter that drives at a higher speed than the commercial power frequency. When one apparatus is used, the piston displacement of the compressor increases due to high rotation. This increases the flow velocity in the piping when the refrigerant passes through the refrigeration system, so that the oil 210 remaining in the refrigeration system can be returned to the compressor 100 more quickly, and the shell Insufficient oil amount can be prevented.

[0163] In addition, the compressor 100 of the present embodiment achieves downsizing in the height direction of the compressor, and the total height of the conventional general small compressor is 190mn! With respect to ~ 200 mm, the compressor 100 of the present embodiment is downsized in the height direction to about 145 mm.

[0164] When miniaturizing the overall height of the compressor, in order to avoid oil spills, etc., the oil level enclosed in the compressor is generally About 30 mm, which is equivalent to a typical conventional small compressor, is secured. For this reason, the oil oil level with respect to the total height of the conventional compressor is about 12% to 13%, whereas in the small compressor of the present embodiment, the oil oil level with respect to the total height of the compressor. However, the oil spill when the compressor is tilted has become a bigger problem.

[0165] In order to reduce the size of the compressor 100 according to the present embodiment, the compressor 100 and the electric element 203 are reduced in height to reduce the size of the compressor! / ヽThe

That is, the mechanical part consisting of the compression element 204 and the electric element 203 is elastically supported, and the part of the support part 205 is not taken as an element for reducing the height, and the mechanical part of the compression element 204 and the electric element 203, ie, the inside By reducing the height of the component parts, the oil 210 does not buffer with the electric element 203 of the machine part, and the oil level is less likely to fluctuate!

[0167] As described above, regarding the downsizing of the compressor 100 in the height direction, which is a major problem in the configuration in which the compressor 100 is arranged on the upper part of the refrigerator body, the oil 100 is particularly important among the elements and viewpoints for downsizing. The present embodiment adopts a combination of the above-described miniaturization elements that are not intended to promote spillage, in other words, to maintain reliability related to oil spill suppression.

[0168] In addition, the height from the uppermost part of the oil surface of the oil 210 to the opening of the suction pipe 200 is ensured to have a dimensional relationship equal to or greater than that of the conventional compressor, so that the oil 210 flows out. Can be suppressed. For example, the opening position of the suction pipe 200 to the shell is located above the 1Z2 height with respect to the maximum height in the shell, so that the effect of preventing oil outflow when the compressor 100 is tilted is increased. be able to.

[0169] Further, in the present embodiment, the compression element 204 is formed with the upper shell (not shown) or the lower shell 201 and the contact portion 220 having a certain gap, so that the compressor is inclined. In this case, the contact portion 220 and the upper shell or the lower shell 201 come into contact with each other, so that the mechanical portion including the large compression element 204 and the electric element 203 is not greatly inclined. Therefore, it is possible to prevent the mechanical portion from pressing the volume of the oil moved to the inclined side and to secure a space portion, thereby preventing the oil 108 from easily flowing out from the suction pipe.

[Embodiment 9]

FIG. 17 shows a schematic cross-sectional view of a compressor mounted on the refrigerator in the ninth embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the same structure as background art.

[0171] Inside the compressor 100, the suction pipe 106 extends into the shell and is a direct suction type joined to the suction muffler 139 via a spring 106a, which is an elastic member, and inside the suction muffler 139. It passes into the cylinder 136 through a spatial path. Further, the inside of the shell of the suction pipe 106 has a bent portion directed upward, and the shell is opened upward by force and is connected to a spring 106a which is an elastic member.

[0172] The suction muffler 139 is connected to the cylinder head 135, and the cylinder 136 is disposed in the same direction as the cylinder head 135. Further, the suction pipe 106 is arranged in the same direction so as to be connected to the suction muffler 139. The discharge pipe 107 is attached to the lower shell on the side opposite to the cylinder head with a predetermined pipe length so as to increase the elasticity of the pipe to reduce pressure pulsation. By configuring the suction pipe 106 and the discharge pipe 107 on the opposite sides, a compact compressor 100 can be configured.

[0173] With the configuration of the direct suction as described above, even when the compressor 100 is inclined, the clearance of the cylinder 136 is the clearance of the valve of the cylinder head 135 and the oil 108 return hole (not shown) provided in the suction muffler 139. )), And the back flow outflow of oil 108 does not occur.

[0174] The suction pipe 106 and the suction muffler 139 are joined by a tightly wound spring. In this case, the transmission of compression vibration is reduced, and the oil 108 can also reduce the outflow from the spring gap due to the viscosity, so that the back flow of the oil 108 can be reduced.

[0175] As an elastic member for connecting the suction pipe 106 and the suction muffler 139, in this embodiment, an elastic resin such as a rubber using a spring may be used.

Industrial applicability

[0176] When the refrigerator according to the present invention has a refrigeration cycle in which the compressor is disposed above the evaporator, oil can be prevented from flowing out of the compressor. Therefore, it is possible to reduce the shortage of refrigeration equipment in the compressor, and it is useful as a refrigeration cycle configuration for storage refrigerators equipped with commercial refrigerators, vending machines, and other cooling devices as well as household refrigerators. .

Claims

The scope of the claims

[1] Insulated box,

A refrigeration cycle in which a compressor, a condenser, a decompressor, and an evaporator provided in the heat insulation box are sequentially provided to form a continuous refrigerant flow path;

The oil enclosed in the space containing the internal components in the compressor, and the suction pipe connecting the compressor and the evaporator, the internal force of the compressor The oil to the evaporator side An oil spill prevention trap that prevents spillage,

The compressor is an internal low-pressure type and is disposed on a top surface portion of the heat insulating box, and the evaporator is provided below the compressor.

[2] The heat insulation box includes a recess at the rear of the top surface,

The refrigerator according to claim 1, wherein the recess and the oil outflow prevention trap are provided in the recess.

[3] The oil outflow prevention trap according to claim 1 or 2, wherein the oil outflow prevention trap prevents the oil from flowing out from the inside of the compressor to the evaporator side when tilted so that the front side of the heat insulating box is upward. The refrigerator described.

[4] The oil spill prevention trap has a U-bending portion obtained by bending a pipe in a U-shape in the front-rear direction of the heat-insulating box.

The refrigerator according to any one of claims 1 to 3, wherein at least a part of the U-bending portion is disposed on a front side of the heat insulating box body with respect to a center line of the compressor.

5. The refrigerator according to any one of claims 1 to 4, wherein the oil spill prevention trap is provided inside the compressor shell.

6. The oil spill prevention trap is a chamber in which the connection side of the evaporator is protruded in the upward direction and the connection side of the compressor is connected downward. The refrigerator according to item.

[7] The oil spill prevention trap is arranged such that a connecting portion between the compressor and the suction pipe is disposed on the front side of the heat insulating box with respect to a center line in a vertical direction in a front-rear cross section of the compressor. The refrigerator according to any one of 1 to 6. The compressor includes an upper shell and a lower shell which are divided into upper and lower parts, and the upper shell and the lower shell house internal components inside and are hermetically joined at a shell joint portion,

The refrigerator according to any one of claims 1 to 7, wherein the suction pipe provided on the lower shell side includes a pipe rising portion extending upward from the shell joint portion.

The refrigerator according to any one of claims 1 to 8, wherein the compressor includes an inclination prevention means for internal components.

The compressor is provided with an upper shell and a lower shell which are divided into upper and lower parts,

The upper shell and the lower shell accommodate internal components inside and are hermetically joined at the shell joint,

The refrigerator according to any one of claims 1 to 9, wherein the suction pipe provided on the lower shell side opens into the compressor on substantially the same plane as the inner wall surface of the lower shell.

A refrigerant is enclosed in the refrigeration cycle,

The refrigerator according to any one of claims 1 to 10, wherein the refrigerant is in a liquefied state and has a specific gravity lighter than that of the oil.

The refrigerant enclosed in the refrigeration cycle is R600a,

The refrigerator according to any one of claims 1 to 11, wherein the oil is mineral oil. The compressor is

An electric element having an inverter motor using a permanent magnet as a rotor, and a compression element having a bearing portion;

With

The refrigerator according to any one of claims 1 to 12, wherein the bearing portion is fitted into a height range of a rotor of the electric element.

A heat insulating box provided with a dent on the back of the top surface;

An internal high-pressure compressor disposed in the recess,

A condenser provided on the top surface of the heat insulating box;

Have

The compressor and the condenser are connected by a discharge pipe, The refrigerator is a refrigerator that is disposed at a higher position in front of the heat insulation box than a discharge pipe connection portion of the compressor.