JP2006145189A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator for preventing the back flow of refrigeration oil from a compressor arranged on the top surface. <P>SOLUTION: The refrigerator comprises the compressor 11 of an inside low pressure type arranged on the top surface of a heat insulating box 1, an evaporator 9 provided on the lower side of the compressor 11, and a suction pipe 33 via which the compressor 11 and the evaporator 9 are connected to each other. The suction pipe 33 has an oil flow-out preventing trap 36. The oil flow-out preventing trap prevents the back flow of the refrigeration oil 45 during carrying the refrigerator being laid down with the compressor also being laid down when transporting or transferring the refrigerator. Thus, the possibility of damaging the compressor is further reduced while securing oil supply into the compressor 11 at its sliding portion. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a refrigerator that has improved oil flow-out prevention performance from a compressor, which is refrigeration oil in a refrigeration cycle.

  In recent years, refrigerators are required to be further energy-saving from the viewpoint of protecting the global environment and to be improved in usability and storage.

  A conventional refrigerator of this type has been installed on the top of the refrigerator main body, or on the upper back of the refrigerator main body using a compressor or the like forming a machine room (see, for example, Patent Document 1). ).

  FIG. 18 shows a configuration of a conventional refrigerator described in Patent Document 1. As shown in FIG.

  The refrigerator main body 1 is composed of a refrigerator compartment 2, a vegetable compartment 3, and a freezer compartment 4 from above. The refrigerator compartment 2 has a rotary door 5, the vegetable compartment 3 is a vegetable compartment drawer door 6, and the freezer compartment 4 is a freezer compartment. A drawer door 7 is provided. In this configuration, the cooling unit 10 including the internal fan 8, the evaporator 9, and the like is set to a height that is substantially the same as the height of the opening of the freezing chamber 4 that forms a storage unit as the lowermost storage chamber. The compressor 11 is installed on the top surface of the refrigerator room 2 which is not easy to use, or on the recessed portion 12 provided on the upper back of the refrigerator main body 1.

If the storage volume of the compressor 11 is moved from the lower side to the upper side of the partition wall that partitions the refrigerator compartment 2 and the vegetable compartment 3, the refrigerator compartment 2 and the vegetable compartment are inevitably provided that the internal volume of each storage compartment is constant. The position of the partition wall of 3 can be lowered | hung below, and the taking-out thing in the vegetable compartment 3 becomes easy.
JP-A-11-183014

  However, in the above conventional configuration, the suction pipe (not shown) and the evaporator connected to the compressor are disposed by arranging the compressor on the top surface of the refrigerator body and the evaporator near the bottom surface of the refrigerator body. Is disposed below the compressor. Therefore, when transporting and moving refrigerators including logistics from delivery to store as well as customers, refrigeration oil (hereinafter referred to as oil) flows backward from the compressor when the refrigerator is carried over on its side, and even after installation There was a problem of staying down as it was.

  When 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 about 6.35mm to 7.94mm in order to reduce pressure loss. If the pipe wall thickness is 0.35mm and the length is 2000mm, the internal volume will be From 50ml to 80ml. Since the length of the suction pipe limits the length of heat exchange between the capillary and the suction pipe, the length of the suction pipe cannot be shortened in order to achieve high efficiency. Furthermore, when the volume in the pipe of the evaporator is added, the volume becomes very large. Furthermore, if the diameter of the suction pipe is increased to reduce pressure loss, the volume of the pipe will increase.

  On the other hand, with regard to the amount of oil stored in the compressor, the smaller the shape, the more effective it is because the ineffective volume on the top of the refrigerator can be reduced. The effect of changing the oil surface height increases. For the sake of clarity, if the compressor is made into a quadrangular prism shape of 140 mm and 100 mm, and the volume of the internal storage component is emptied, the oil surface height will change by 1 mm with an oil amount fluctuation of 14 ml. The oil level height of 3.5 mm to 5.7 mm will be reduced even if the spill of 50 mm to 80 mm is used. Actually, there is a volume of the internal storage item, and the higher the oil surface height, the larger the storage item volume. Therefore, the oil surface height is further reduced.

  By the way, the compressor supplies the oil stored in the lower part to the sliding part using differential pressure and centrifugal force, so the oil supply amount to the sliding part decreases due to the decrease in the oil surface height, It was a problem in ensuring reliability such as wear of sliding parts.

  In addition, when the cooling operation is performed, the oil in the pipe is gradually returned to the compressor as the refrigerant circulates. However, if a large amount of high-viscosity oil flows out, it is difficult to instantaneously return to the compressor against gravity. It was a problem in ensuring reliability.

  The present invention solves the above-described conventional problems, and an object of the present invention 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.

  In order to solve the above-described conventional problems, a refrigerator according to the present invention includes a heat insulating box, a compressor, a condenser, a decompressor, and an evaporator provided in the heat insulating box in order. And an oil sealed in a space containing the electric element and the compression element, which are internal components in the compressor, and the compressor is an internal low-pressure type and the electric element And an inverter 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, thereby the electric element and the compression element The components other than the support portion for supporting the internal components are reduced in the height direction, and are disposed on the top surface portion of the heat insulating box, and the evaporator is provided below the compressor. Connected to the compressor and the evaporator. The suction piping, characterized in that the oil outflow prevention trap for preventing the outflow of the oil to the evaporator side from the inside of the compressor is provided.

  As a result, when transporting and moving refrigerators including logistics from delivery to storefront as well as customers, the compressor also lies on its side, and the suction pipes open inside the compressor Oil flows into the open end. However, since the suction pipe is provided with a pipe trap for preventing oil outflow, the suction pipe does not flow out into the inner part of the suction pipe, and further, oil does not flow backward from the suction pipe to the evaporator. Thus, even after the transportation or the like, even if the refrigerator is raised and installed, the oil spill prevention trap can prevent oil from staying in the suction pipe and the evaporator below the compressor.

  Furthermore, when reducing the height of the compressor, the supporting portion that supports the compression element and the electric element is not taken in as a height reduction element, and the oil is supported by reducing the height with the compression element and the electric element. It is not buffered with other internal components, and the oil level is less likely to fluctuate, and oil outflow from the suction pipe can be suppressed.

  In the refrigerator of the present invention, the compressor is arranged on the top of the refrigerator to reduce the height of the compressor, and the oil is prevented from flowing out when the refrigerator is laid down on the suction pipe and the evaporator arranged below. Therefore, it is possible to prevent the oil level from being significantly reduced and to ensure the supply of oil to the compressor sliding portion, thereby further reducing the risk of damage to the compressor.

  The invention according to claim 1 is a refrigeration cycle comprising a heat insulation box, a compressor, a condenser, a decompressor, and an evaporator provided in the heat insulation box in order to form a series of refrigerant flow paths, An electric element which is an internal component in the compressor and oil sealed in a space containing the compression element. The compressor is an internal low-pressure type, and a permanent magnet is used as a rotor for the electric element. A support for supporting the internal component composed of the electric element and the compression element by inserting and inserting the bearing portion of the compression element within the height range of the rotor of the electric element. The component other than the portion is designed to be downsized in the height direction and is disposed on the top surface portion of the heat insulating box, and the evaporator is provided below the compressor, and the compressor and the The above-mentioned compression is applied to the suction pipe connecting the evaporator. Wherein the oil outflow prevention trap for preventing the outflow of the oil from the inside to the evaporator side is provided.

  As a result, when transporting and moving refrigerators including logistics from delivery to storefront as well as customers, the compressor also lies on its side, and the suction pipes open inside the compressor Oil flows into the open end. However, since the suction pipe is provided with an oil outflow prevention trap, the suction pipe does not flow into the inner part of the suction pipe, and further, the oil does not flow backward from the suction pipe to the evaporator. Thus, even after the transportation or the like, even if the refrigerator is raised and installed, the oil outflow prevention trap can prevent oil from staying in the suction pipe and the evaporator below the compressor.

  Therefore, when the compressor is placed on the top of the refrigerator and when the refrigerator is laid down, it prevents oil from flowing into the suction pipe and evaporator located below the compressor. Therefore, the oil supply to the compressor sliding portion can be secured, and the risk of damage to the compressor can be further reduced.

  In addition, since the internal volume of the suction pipe can be increased, it is possible to save energy by reducing the pressure loss by increasing the inner diameter and by increasing the refrigeration effect by extending the pipe length and increasing the heat exchange length with the capillary. You can plan.

  Furthermore, when reducing the height of the compressor, the supporting portion that supports the compression element and the electric element is not taken in as a height reduction element, and the oil is supported by reducing the height with the compression element and the electric element. It is not buffered with other internal components, and the oil level is less likely to fluctuate, and oil outflow from the suction pipe can be suppressed.

  According to a second aspect of the present invention, an internal low-pressure compressor includes an upper shell and a lower shell which are divided into upper and lower parts, and after the components are housed therein, the upper shell and the lower shell are at the shell joint. The suction pipe provided on the lower shell side is hermetically joined and opens to the inside of the compressor on the same plane as the inner wall surface of the lower shell. Even in compressors equipped with suction pipes that allow oil to more easily flow out, oil stays in the suction pipes and evaporators below the compressor even if the refrigerator is installed after transportation. Can be prevented.

  According to a third aspect of the present invention, when the refrigerant is sealed in the refrigeration cycle, the specific gravity is lighter than the oil sealed in the compressor in a liquefied state, and the compressor is tilted. Even in a compressor that uses a combination of refrigerant and oil that allows oil to more easily flow out from the suction pipe, the suction pipe and evaporation below the compressor may be installed even if the refrigerator is raised after transportation. Oil can be prevented from staying in the vessel.

  In the invention according to claim 4, since the refrigerant in which the refrigerant is sealed in the refrigeration cycle is R600a, and the oil sealed in the compressor uses mineral oil, the volume flow rate per unit time of the refrigerant increases. Since the flow velocity in the piping when the refrigerant passes through the refrigeration system increases to about twice as much as R134a and about 20 times compared to CO2, the oil staying in the refrigeration system can be removed from the compressor. It is possible to quickly return to the initial position, and it is possible to prevent a shortage of oil in the shell.

  The invention according to claim 5 is characterized in that the heat insulating box is provided with a recess at the rear of the top surface, and a compressor and an oil outflow prevention trap are provided in the recess.

  As a result, when the refrigerator is transported or relocated to carry it sideways, even when a compressor is installed at the rear of the top where the inclination of the compressor increases, the oil spill prevention trap can Oil can be prevented from staying in the suction pipe and the evaporator below the machine.

  According to a sixth aspect of the present invention, 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 on the upper side. It is characterized by.

  Thereby, the oil outflow from a compressor can be prevented also at the time of the conveyance at the time of lying down so that the door of the front of a refrigerator may turn up, and a transfer.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same reference numerals are given to the same configurations as those of the conventional example or the embodiment described above, and detailed description thereof will be omitted. The present invention is not limited to the embodiments.

(Embodiment 1)
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 according to the embodiment, and FIG. 3 is a refrigerator according to the embodiment. 4 is a schematic perspective view of the main part of the suction pipe of the refrigerator according to the embodiment, and FIG. 5 is a schematic sectional view of the compressor mounted on the refrigerator according to the embodiment. FIG. 6 shows a schematic sectional view of the refrigerator transported state in the embodiment, and FIG. 7 shows a schematic sectional view of the compressor during the refrigerator transportation in the embodiment. In addition, the same code | symbol is attached | subjected about the same structure as background art.

  In FIG. 1 to FIG. 4, the heat insulating box 1 includes a heat insulating body 15 that foams and fills a space formed by an inner box 13 in which a resin body such as ABS is vacuum-formed and an outer box 14 using a metal material such as a pre-coated steel plate. It has a heat insulating wall that is injected. As the heat insulator 15, for example, rigid urethane foam, phenol foam, styrene foam, or the like is used. Use of hydrocarbon-based cyclopentane as the foaming material is better from the viewpoint of preventing global warming.

  The heat insulation box 1 is divided into a plurality of heat insulation sections, and has a structure in which the upper part is a revolving door type and the lower part is a drawer type. From the top, there are a refrigerator room 2, 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 heat insulation door via a gasket 18. From the top, they are 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.

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

  Moreover, the outer box 14 of the heat insulation box 1 is a machine that constitutes a shell 24 obtained by U-bending a steel plate whose top surface is cut off, a bottom panel 25, a back panel 26, and a recess 27 in which the back of the top surface is recessed. The chamber panel 28 is assembled to ensure sealing performance. The machine room panel 28 is formed by drawing a steel plate, and the corner portion has an R shape for improving workability. The R shape secures a flow path of the branching or merging portion of the heat insulating body 15 to be foam-filled to improve fluidity, and can prevent generation of voids due to insufficient filling.

  The machine room panel 28 has the deepest arrangement portion of the compressor 11 and a shape in which the throttle is shallower toward the left and right ends. Is improved.

  Furthermore, since the machine room panel 28 is drawn, it is advantageous in terms of man-hours because it requires less sealing portions for foam filling, and if a similar shape is formed by sheet metal processing, the cost of the drawing die is reduced. In addition, the finish can be reduced and the dimensional accuracy can be improved.

  In addition, the machine room panel 28 is provided with a plurality of air vent holes (not shown) on each surface, and can prevent the generation and deformation of voids due to residual air without impairing the appearance and the inside view.

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

  In addition, the inner box 13 is slightly smaller than the outer box 14, and the back portion of the inner box 13 is recessed inward, and the space in which the heat insulating body 15 is foam-filled by being incorporated in the outer box 14 is a heat insulating box body. 1 is formed. Therefore, the left and right parts of the machine room panel 28 are also filled with the heat insulator 15 to form heat insulating walls, and the strength is ensured. Further, the strength of the bottom handle 29 and the back handle 30 is ensured by the heat insulating body 15 filled with foam.

  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, the top surface of the shell 24, the recess 27, the bottom panel 25, A condenser (not shown) provided on the side surface of the shell 24, a capillary 32 as a decompressor, a dryer (not shown) for removing moisture, and a cooling fan 8 on the back of the vegetable compartment 3 and the freezer compartment 4 Are arranged in the vicinity of the evaporator 9 and the suction pipe 33 connected in a ring shape.

  The recess 27 is provided with a top cover 34 fixed with screws or the like, and houses the compressor 11, condenser (not shown), machine room fan, dryer, piping, etc. provided in the recess 27. It is.

  The capillary 32 and the suction pipe 33 are copper pipes having substantially the same length, and are soldered so as to be able to exchange heat, leaving the end portions. The capillary 32 is a small-diameter copper tube having a large internal flow resistance for pressure reduction, and the inner diameter is about 0.6 to 1.0 mm and is adjusted with the length to design the amount of pressure reduction. The suction pipe 33 uses a large-diameter copper pipe in order to reduce pressure loss, and its inner diameter is designed to be about 6.35 mm to 7.94 mm. Further, in order to ensure the length of the heat exchanging portion 35, it is meandered and compactly arranged so that the meandering portion comes to the back of the refrigerator compartment 2, and is arranged in the middle between the inner box 13 and the back panel 26 to insulate. Embedded in the body 15. One end of the capillary 32 and the suction pipe 33 protrudes from the rear position of the vegetable compartment 3 of the inner box 13 and is connected to the evaporator 9, and the other end is provided in a notch ( It protrudes upward from an unshown) and is connected to a dryer (not shown), a condenser and a compressor 11 respectively.

  In addition, since piping is taken in and out from the back of the vegetable room 3 with comparatively high temperature, the increase influence of the heat | fever amount which penetrate | invades by piping putting in and out is small, and it is effective in hand-made energy saving.

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

  The suction pipe 33 is provided with a slight upward slope from the lower side on the back side of the compressor 11 and is caused to advance straight, and then is substantially higher in the vertical direction than the vertical center line of the compressor 11 and higher than the height of the compressor 11. A rising part is provided to a lower position. 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 the space between the compressor peripheral wall as much as possible. By setting the pipe height to a height of 11 or less, it is possible to prevent the wall surface contact of the pipe.

  Further, the suction pipe 33 is provided with an oil outflow 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. It is located in the front side of a heat insulation box rather than the plane direction centerline. Since the compressor 11 has a shape having a curvature toward the top surface, if the pipe bending portion 37 is formed above the compressor 11, there is a space, and the size of the compressor 11 can be reduced without taking up an extra pipe storage space. Is possible. Further, by providing the pipe U-bending portion 37, the elasticity of the pipe can be provided, vibration propagation from the compressor 11 can be absorbed, stress concentration at the pipe fixing portion can be prevented, and the risk of pipe breakage can be reduced.

  The suction pipe 33 is bent in a substantially vertical direction after being bent in the U direction, and is embedded in the heat insulator 15 from the rear end portion of the machine room panel 28.

  The internal structure of the compressor 11 will be described.

  In FIG. 5, the periphery of the shell joint 40a, which is an overlapped portion obtained by combining a bowl-shaped lower shell 38 and an inverted bowl-shaped upper shell 39 formed by deep drawing a thick steel plate of 2 to 4 mm, is formed. A rotary drive unit 42 and a compression unit 43 elastically supported by an elastic body 41 are provided inside a compressor-type shell 40 having a hermetically sealed structure connected by welding, and a suction pipe 33 having an open end inside the compressor shell 40, and a discharge The pipe 44 is connected to other devices constituting the refrigeration cycle, and a predetermined amount of oil 45 and a refrigerant (not shown) are enclosed. Further, a support portion 46 for elastically supporting the heat insulating box 1 is attached to a lower portion of the lower shell 38. In addition, the support part 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 is provided with a stator 49 having a hollow cylindrical electromagnetic coil that generates a rotational force between a permanent magnet and a voltage applied thereto, and a hollow portion inside the stator 49. And a rotor 50 having permanent magnets opposed to each other by a minute gap. The bearing portion 48 is provided with an eccentric shaft 51 at the end, the inside is hollow at both ends, and a spiral groove (not shown) around the periphery. The shaft 52 is provided with a jet hole that communicates with the shaft 52, and the bearing 53 holds the shaft 52 rotatably.

  The compression portion 43 is attached to a cylinder 55 provided with a cylinder head 54 having a valve mechanism (not shown) at the tip, a piston 56, a piston 56, and an eccentric shaft 51 so as to be swingable and linearly reciprocating. It is comprised with the rod 57 converted into operation | movement. A discharge pipe 44 is connected to the cylinder head 54 via a valve mechanism so that the compressed refrigerant is directly discharged to the outside of the compressor shell 40, and the suction portion is connected to the compressor shell 40 via the valve mechanism. It is open inside. In order to mute the sound, a suction muffler (not shown) is provided between the cylinder head 54 and the suction chamber of the machine room shell 40 for the suction path.

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

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

  First, the temperature setting and cooling method of each heat insulation section will be described. The refrigerator compartment 2 is normally set at 1 to 5 ° C. with the lower limit of the temperature at which it is not frozen for refrigerated storage. The storage case 23 is set at a relatively low temperature, for example, -3 to 1 ° C, for improving the freshness of meat fish and the like.

  The switching chamber 16 can change a temperature setting by a user setting, and can be set to a predetermined temperature setting from the freezer compartment temperature zone to the refrigeration and vegetable compartment temperature zones. The ice making chamber 17 is an independent ice storage chamber and includes 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 also be set at a freezing temperature of −18 ° C. to −10 ° C., which is relatively higher than the freezing temperature zone for the purpose of storing ice.

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

  The freezer compartment 4 is normally set at −22 to −18 ° C. for frozen storage, but may be set at a low temperature of −30 or −25 ° C., for example, to improve the frozen storage state.

  Each chamber is divided by a heat insulating wall in order to efficiently maintain different temperature settings. However, as a method of improving the heat insulating performance at a low cost, it is possible to integrally foam and fill with the heat insulating body 15. Compared to the use of a heat insulating member such as polystyrene foam, the heat insulating performance can be increased by about twice, and the storage volume can be increased by thinning the partition.

  Next, the operation of the refrigeration cycle will be described. The cooling operation is started and stopped by a signal from a temperature sensor (not shown) and a control board according to the set temperature in the cabinet. A voltage is applied through a wire from a terminal (not shown) to the motor 47 of the rotation drive unit 42 in the compressor 11 in accordance with the instruction of the cooling operation.

  When the motor 47 operates, 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 a position farthest from the cylinder 55, the pressure in the cylinder 55 is reduced, and the valve mechanism (not shown) of the suction portion provided in the cylinder head 54 is opened, so that the compressor The refrigerant gas in the shell 40 is sucked into the cylinder 55 via a muffler muffler (not shown). Next, when the piston 56 moves to a position closest to the cylinder 55, the sucked refrigerant gas is compressed and becomes a high-temperature and high-pressure refrigerant gas and is discharged from the discharge portion of the cylinder head 54 through the valve mechanism. The discharged refrigerant gas is sent out of the compressor shell 40 through a discharge pipe 44 directly connected to the cylinder head 54.

  Thus, the compressor shell 40 has an internal low-pressure type structure in which low-pressure refrigerant gas is present, and the refrigerant gas returning from the suction pipe is discharged into the compressor shell 40.

  The sliding portion 58 existing in the bearing portion 48 and the compression portion 43 of the compressor 11 is ensured to be lubricated by the oil 45. Furthermore, a compatible combination of oil 45 and refrigerant gas is selected, and a combination of R134a and ester oil having a low ozone depletion coefficient, especially HC600a which is a hydrocarbon refrigerant having a low global warming coefficient and good for environmental protection. And mineral oil.

  The oil 45 is enclosed 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 by being transmitted through the hollow interior of the shaft 52 by 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 the oil 45 that goes back from the inside of the shaft 52 is sprayed from an ejection hole (not shown) provided at a position facing each part of the sliding portion 58. ing. Further, the supply of the oil 45 to the sliding portion 58 can be sufficiently spread by the spiral groove around the shaft 52.

  The high-temperature and high-pressure refrigerant discharged by the operation of the compressor 11 as described above dissipates heat in a condenser (not shown) to be condensed and liquefied, and is reduced in pressure by the capillary 32 to become a low-temperature and low-pressure liquid refrigerant. To.

  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 after the heat exchange is distributed by a damper (not shown) or the like. Cooling takes place.

  The refrigerant exiting the evaporator 9 is sucked into the compressor 11 through the suction pipe 33. At this time, since the suction pipe 33 is soldered to the capillary 32 so as to be capable of exchanging heat and is embedded in the heat insulator 15, heat is transferred from the low-temperature suction pipe 33 to the high-temperature capillary 32 without escape of heat to the surroundings. Since the capillary 32 is cooled in the process of depressurizing the refrigerant, the specific enthalpy is lowered and the refrigeration effect is increased. In the suction pipe 33, the refrigerant temperature rises and can be made substantially 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 a very low refrigerant temperature of −20 ° C. or less in the evaporator 9, so that the effect of reducing heat loss is particularly great.

  In addition, since the capillary 32 is relatively hot, if it is placed in a low temperature region, heat is dissipated in addition to heat exchange with the suction pipe 33, resulting in heat loss in the refrigeration cycle and a heat load on the inside of the cabinet, reducing energy saving. However, since the capillary 32 and the suction pipe 33 are arranged on the back surface of the refrigerator compartment 2 having a high internal temperature, it is possible to ensure energy saving without greatly increasing heat loss and heat load on the internal storage. In particular, the heat exchanging portion 35 is sufficiently long and meandering on the back of the refrigerator compartment 2 to be stored compactly, so that energy saving and sufficient temperature rise of the suction pipe 33 can be obtained. Since the ascending gradient is provided and the trap is not provided, the liquid refrigerant and the refrigeration oil are not retained, and the performance influence such as pressure loss is not caused.

  At the time of transporting or moving the refrigerator performing the above-described operation, it is transported by a plurality of persons such as four people using the bottom handle 29 and the back handle 30 provided on the bottom panel 25 and the back panel 26 as shown in FIG. It is like that.

  The weight of refrigerators has increased significantly with the increase in the amount of additional parts accompanying the increase in internal volume and high functionality, and the increase in the use of high-density vacuum insulation materials for energy savings. However, the height is nearly 1800mm, and the width and depth are about 600mm to 750mm, so the device for transportation has become very important.

  When the refrigerator is delivered to the customer, it is necessary to have a sideways transporting form. For this reason, handles are provided on the bottom and upper back. Also, refrigerators are often laid down and transported immediately before the power is turned on, such as during moving and redesigning as well as during delivery.

  With these handle configurations, the refrigerator can be transported with the door surface facing upward, the door is opened unexpectedly during transportation, making it unsafe for the transporter, and problems such as falling parts and stored items in the warehouse. Can be prevented.

  At this time, as shown in FIG. 7, the inside of the compressor 11 provided in the concave portion 27 on the top surface has the open end of the suction pipe 33 opened in the compressor shell 40 submerged in the oil 45. Thus, a backflow outflow is possible from the suction pipe 33, but the oil outflow prevention trap 36 composed of the pipe U bent portion 37 is configured to rise upward with respect to the staying surface of the oil 45 during transportation. Therefore, the oil 45 does not flow into the suction pipe 33 and the evaporator 9. 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 the suction pipe 33 is not left closed with the oil 45.

  As a result, a predetermined amount of oil 45 in the compressor shell 40 is secured to prevent insufficient lubrication of the sliding portion 58, and in particular, insufficient lubrication of the sliding portion 58 when the power is turned on for the initial start of the compressor 11. Therefore, it is possible to provide a highly reliable refrigerator that can further reduce the risk of damage to the compressor 11 and the like.

  In addition, in order to minimize pulling in the interior of the recessed portion 27, the condenser may be thin and disposed on the top surface, or as a box-shaped configuration, the compressor 11 and the machine room fan 31 are provided in the recessed portion 27. May be arranged in parallel to secure the internal volume in the vertical direction, and if the condenser increases the external surface area such as the fin tube type, wire tube type, spiral fin tube type, etc. It is effective in reducing the size of the condenser and saving energy by increasing its capacity.

  The condenser is not limited to the forced air cooling type, but may be a natural air cooling type composed of copper piping adhered to the inner side of the outer box 23 with good heat transfer, and is arranged in a partition between the heat insulating door bodies in each room. You may combine and combine the copper piping for performing drip-proof prevention.

  When HC600a is used as the refrigerant, the specific volume of the refrigerant gas is larger and the volume flow rate is increased, so the flow rate of the heat exchanging portion is also increased, heat transfer is promoted, and the temperature of the suction pipe 33 is increased and the capillary 32 is cooled. The effect is improved with respect to the increase in the refrigeration effect, the compatibility with the refrigerant is large, and the gas flow rate is also large.

  In addition, by using flow control means such as an electric three-way valve and an electric expansion valve, a plurality of evaporators are used properly according to the compartment configuration and temperature setting configuration, a plurality of capillaries are switched, and the pressure reduction amount is controlled. In addition, further energy saving can be achieved by cutting the gas while the compressor 11 is stopped. In particular, by providing the flow path control means in the recessed portion 27 on the top surface of the heat insulating box 1, the heat load on the inside of the box can be reduced, and further an energy saving effect is obtained.

  In addition, the rear handle 30 for carrying the refrigerator is provided below the recessed portion 27 where strength is easily secured. However, if the rear handle 30 is provided in the center at the same position, the space can be arranged efficiently. There is an effect of expanding the internal volume. Further, if the rear handle 30 is provided so as to be distributed to the left and right above the top cover 34, the installation space of the compressor 11 can be escaped and the handle shape can be configured, so that space efficiency is improved and the corner portion of the heat insulating box 1 is also carried by carrying. This is an easy-to-hold effect. By providing the bottom handle 29 also at the bottom front end, the corner portion is gripped and the ease of holding can be improved.

  In addition, although the recessed part 27 of the heat insulation box 1 comprised the right and left wall surface with the heat insulating body 15, if the side surface is comprised only with the shell 24, the heat dissipation of the compressor 11 will improve and also the component space arrange | positioned in the recessed part 27 Can be taken big.

  In the present embodiment, the compressor 11 is provided in the recess 27 at the rear of the top surface of the heat insulation box 1. However, the top surface portion of the heat insulation box 1 is not substantially provided with a recess or the like, but is substantially planar. Even in the case where the compressor 11 is provided on the top surface, in the refrigerator of the type in which the evaporator 9 is below the compressor 11, similarly, when it is laid down by transporting the refrigerator or the like, the suction disposed below the compressor 11 Since oil is prevented from flowing out into the pipe 33 and the evaporator 9, the amount of oil in the compressor 11 can be secured and the oil surface height can be prevented from being greatly reduced, and the sliding portion of the compressor 11 can be prevented. The oil supply can be secured, and the risk of damage to the compressor 11 can be reduced.

(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.

  In FIG. 8, the suction pipe 33 rises in the compressor shell 40 toward the upper part of the compressor, and further, a pipe bend in the lateral direction is provided in the upper part so that the open end is configured toward the center. . When the oil spill prevention trap 36 provided by the structure of the suction pipe 33 is carried with the refrigerator lying down, even if the oil 45 moves due to the compressor 11 lying down, the opening end of the suction pipe 33 is moved. Is not immersed in the oil 45, and backflow outflow can be prevented.

  Therefore, since the compressor 11 is arranged on the top surface of the refrigerator, the oil 45 in the compressor shell 40 is prevented from flowing out when the refrigerator is laid down on the suction pipe 33 and the evaporator 9 arranged below. Can be ensured, and sufficient oil supply to the sliding portion 58 is possible, thereby further reducing the risk of damage to the compressor.

  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, reducing the pipe storage space of the recessed portion 27 of the heat insulating box 1, and the contents inside the box. It is possible to save energy by increasing the product and increasing the thickness of the insulation wall.

  If the suction pipe is directly connected to the muffler for silencing provided in the intake gas path inside the compressor shell 40 and configured as an oil outflow prevention trap in the muffler internal path, the heat of the compressor components Since the refrigerant gas is directly sucked from the suction pipe without sucking the refrigerant gas warmed by the influence, 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 insulating box 1 includes a first suction pipe 33 a connected from the evaporator 9, a second suction pipe 33 b connected to the compressor 11, and a second suction pipe 33 b. The chamber 59 has a larger diameter than the suction pipes 33a and 33b provided between the first and second suction pipes 33a and 33b, and has an outer shape of 20 mm to 40 mm. The first suction pipe 33a is inserted from the upper side of the chamber 59, the pipe protrudes inside to provide an open end, the second suction pipe 33b is inserted from the lower side of the chamber 59, and the pipe open end is set to the chamber. 59 is arranged so as to be flush with the inner wall surface.

  As a result, when the refrigerator is laid down and carried, the oil 45 moves due to the compressor 11 lying down, and when the open end of the second suction pipe 33b is submerged in the oil 45, the oil 45 once enters the chamber 59. However, since the outflow to the first suction pipe 33a is prevented by the pipe structure in the chamber 59, the oil 45 returns to the compressor shell 40 when the refrigerator is installed again, and the necessary amount is secured. .

  Therefore, since the compressor 11 is disposed on the top 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 disposed below. The oil 45 can be secured, and sufficient oil supply to the sliding portion 58 is possible, thereby further reducing the risk of damage to the compressor.

  If the pipe inserted from the lower part is protruded inside and an oil return hole is provided in the vicinity of the lower end of the inner surface of the chamber 59, the oil stays in the chamber 59 and transient return of the liquid refrigerant occurs. On the other hand, it is possible to provide a buffer mechanism that temporarily stores and prevents direct suction into the compressor 11, prevents liquid compression of the compressor, and further reduces the risk of damage to the compressor.

(Embodiment 4)
FIG. 10 shows a schematic perspective view of the main part of the suction pipe of the refrigerator in 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 disposed on the front side of the heat insulating box 1 with respect to the center line of the compressor 11. After a slight upward slope is provided from the connecting portion 60 and extended in the lateral direction, a rise is provided in a substantially vertical direction, and then a U-bend is provided so as to be embedded in the heat insulator 15 on the back side.

  As a result, when carrying around with the refrigerator lying down, the opening end of the suction pipe 33 is on the top side of the compressor 11 and is immersed in the oil 45 even if the oil 45 moves due to the compressor 11 lying down. No backflow outflow can be prevented.

  Therefore, since the compressor 11 is arranged on the top surface of the refrigerator, the oil 45 in the compressor shell 40 is prevented from flowing out when the refrigerator is laid down on the suction pipe 33 and the evaporator 9 arranged below. Can be ensured, and sufficient oil supply to the sliding portion 58 is possible, thereby further reducing the risk of damage to the compressor.

  Moreover, since the welding connection part 61 with the suction pipe 33 is provided in the back vertical part of the suction pipe 33, pipe welding work can be performed easily.

(Embodiment 5)
11 and 12 show schematic perspective views of main portions of the suction pipe of the refrigerator according to the fifth embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the same structure as background art.

  In FIG. 11, the suction pipe 33 is provided with a slight upward slope from the lower part on the back side of the compressor 11 to the side, and is then moved straight, and then is substantially higher than the vertical center line of the compressor 11 in the vertical direction. The rising portion is provided to a position lower than the height of 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 the space between the compressor peripheral wall as much as possible. By setting the pipe height to a height of 11 or less, it is possible to prevent the wall surface contact of the pipe.

  Further, the suction pipe 33 is arranged so as to surround the compressor 11 so as to surround the periphery of the compressor 11 after rising up in the vertical direction, so that an oil outflow prevention trap 36 is formed. The pipe U-bending tip is located on the front side of the heat insulating box with respect to the center line in the plane direction of the compressor. Since the compressor 11 has a shape having a curvature toward the top surface, if the pipe bending portion 37 is formed above the compressor 11, there is a space, and the size of the compressor 11 can be reduced without taking up an extra pipe storage space. Is possible. In addition, since the length of the suction pipe 33 in the recess 27 can be secured, the pipe can be made elastic, absorb vibration propagation from the compressor 11, prevent stress concentration in the pipe fixing part, and risk of pipe breakage. Can be reduced.

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

  Thus, when the refrigerator is laid down and carried, even if the oil 45 moves due to the compressor 11 being laid down, the oil 45 is supplied to the suction pipe 33 and the evaporator 9 disposed below by the oil outflow prevention trap 36. Therefore, oil 45 in the compressor shell 40 can be secured, sufficient oil supply to the sliding portion 58 is possible, and the risk of damage to the compressor can be further reduced.

  In addition, regardless of the direction of the refrigerator handle, even if the refrigerator is laid down in various directions, a pipe trap is provided so as to surround the compressor. Since it can prevent, there are few restrictions in refrigerator conveyance and a conveyance property improves.

  As shown in FIG. 12, when the suction pipe 33 is arranged in the same direction as the connecting portion from the compressor 11, an oil outflow prevention trap can be configured so as to go around the compressor 11, and the backflow outflow is difficult to be configured. Can do.

(Embodiment 6)
FIG. 13 shows 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. A discharge pipe 63 from the compressor 62 is open to the inside of the compressor 62, and a suction pipe 64 is directly connected to a suction portion of the compressor 62. Further, a thin condenser 65 is provided on the top surface portion of the heat insulating box 1, and is connected from the compressor 62 by a discharge pipe 63 with an ascending gradient. Further, the condenser 65 is disposed in front of and higher than the discharge pipe connection portion 66 of the compressor 62. Further, the downstream portion of the condenser 65 is connected to the capillary 32 by a connecting portion provided on the back side of the recessed portion 27, thereby improving workability and serviceability.

  A dryer (not shown) or the like may be disposed in the vicinity of the connection portion.

  The condenser 65 is forcibly air-cooled by the machine room fan 31, and the air path is configured by a top duct cover 67 that also serves as a cover. The top surface duct cover 67 is provided with a suction opening 68 on the front and side surfaces and a discharge opening 69 on the back surface. Further, a partition 70 is provided between the arrangement portion of the condenser 65 and the recess portion 27. It constitutes the air path.

  As a result, when the refrigerator is laid down in transport or transfer using the refrigerator handle, the compressor is also laid down, and the oil 45 flows into the opening end of the discharge pipe 63 opened inside the compressor. The vessel 65 is arranged on the upper side, so that the oil 45 does not flow out into the condenser 65 due to its own weight.

  As a result, if a large amount of oil 45 flows out into the condenser 65, the piping of the condenser 65 and the capillary 32 downstream thereof will block the oil, thereby affecting the significant performance degradation and reliability deterioration caused by preventing the circulation of the refrigerant. Can be prevented.

  If the discharge pipe 63 is arranged so as to surround the compressor 62 and cross the center line of at least three surfaces of the compressor 62, the oil 45 of the oil 45 can be placed regardless of the direction in which the refrigerator is laid down regardless of the handle. Outflow can be prevented.

  Note that there is no problem even if a condenser arranged separately on the downstream side of the condenser 65 is connected because the condenser 65 becomes a pipe trap.

  If a rotary type compressor is used, there are few components and it is advantageous for downsizing, and it is advantageous in reducing the size of the inside of the refrigerator compartment and reducing the ineffective volume.

(Embodiment 7)
FIG. 14: has shown schematic sectional drawing of the compressor mounted in the refrigerator in Embodiment 7 of this invention. In addition, the same code | symbol is attached | subjected about the same structure as background art.

  The internal structure of the compressor 100 will be described.

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

  The rotation driving unit 104 includes a motor 109 and a bearing unit 110. The motor 109 is provided with a stator 111 having a hollow cylindrical electromagnetic coil that generates a rotational force between a permanent magnet and a voltage applied thereto, and a hollow portion inside the stator 111. And a rotor 112 having permanent magnets opposed to each other through a minute gap.

  In addition, since the compressor 100 is arranged on the top surface and is downsized, it is advantageous in terms of the degree of freedom in arrangement, weight, and effective volume of the refrigerator, 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, the windings can be concentrated and closely wound, and the size can be reduced. Further, since the permanent magnet housed in the rotor 112 is a rare earth permanent magnet such as Nd, for example, the magnetic flux density is about four times larger than that of a commonly used ferrite magnet. The compressor 100 can be reduced in size.

  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 portion becomes small, the refrigerator oil surface height rises to press the volume of the enclosed refrigerator oil, and the refrigerator oil easily flows back into the suction pipe with a slight inclination.

  The shaft 134 includes a shaft main shaft portion 134a and a shaft eccentric portion 134b that is eccentric with respect to the shaft main shaft portion 134a. As the bearing portion 110 of the shaft main shaft portion 134a, an A bearing 131 that receives a load, and an upper shell B bearings 132 that are fixed to 101 and act as tilt prevention means for internal components during transportation and the like.

  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 comprised with the rod 138 which converts into operation | movement.

  A discharge pipe 107 is connected to the cylinder head 135 via a valve mechanism so that the compressed refrigerant is directly discharged to the outside of the compressor 100, and a suction part is connected to the inside of the compressor 100 via the valve mechanism. It is open. In particular, for the purpose of silencing, a silencer muffler (not shown) is disposed between the cylinder head 135 and the suction pipe 106 in the suction path.

  In the refrigerator having the compressor configured as described above, when the refrigerator 100 is laid down during the transfer of the refrigerator, the compressor 100 is supported by the B bearing 132 provided on the upper shell 101 even if the compressor 100 is inclined. The supported internal components such as the rotation drive unit 104 and the compression unit 105 are not greatly inclined toward the wall surface of the lower shell 102. Accordingly, it is possible to prevent the volume of the refrigerating machine oil that has moved to the inclined side from being pressed and to secure a space, thereby preventing the oil 108 from easily flowing out from the suction pipe.

  In this embodiment, the B bearing 132 realizes a bearing structure for preventing the tilting of the internal components. However, the tilt preventing means has a pin that is fitted to the opening provided at the tip of the shaft 134 at a predetermined interval. What is provided on the top surface of the shell 101, the guide member provided on the outer peripheral side of the shaft 134 on the top surface of the upper shell 101 so that the tip end portion of the shaft 134 does not tilt, and the rotation driving unit 104 do not tilt more than a predetermined amount. A similar effect can be obtained by providing a gap at a predetermined interval in the upper and lower guides 101 and 102 and using a guide member or the like.

(Embodiment 8)
FIG. 15 is a schematic cross-sectional view of a compressor mounted on a refrigerator according to Embodiment 8 of the present invention, and FIG. 16 is a view of the interior of the compressor mounted on the refrigerator according to Embodiment 8 of the present invention as viewed from above. is there.

  In the drawing, the suction pipe 200 is disposed on the same surface as the inside of the shell so as not to extend into the compressor of the lower shell 201, and is opposed to the suction port 202a of the suction muffler 202. It is arranged to do.

  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 that the structure is reduced in size by preventing physical buffering of the suction pipe 200 with respect to the internal components in the shell. It is for aiming at.

  In addition, the electric element 203 having the rotor 203a and the stator 203b is elastically supported through a support portion 205 having an elastic member on the lower shell 201, and a compression element is disposed above the electric element 203. 204 is arranged.

  The refrigerating cycle in which a compressor 100, a condenser (not shown), a decompressor (not shown), and an evaporator (not shown) are provided in this order to form a series of refrigerant channels has R600a as a refrigerant. An oil 210 made of mineral oil having a high mutual solubility with respect to R600a is enclosed in the compressor 100.

  As described above, in the compressor 100 of the type in which the electric element 203 is disposed below, the support portion 205 is provided so that the rotor 203a of the electric element 203 that rotates in accordance with the operation of the compressor 100 does not buffer the oil 210. It is arranged in consideration of the height and mounting position.

  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.

  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.

  At this time, a rotor recess 203c is formed on the compression element 204 side of the rotor 203a, and a bearing portion 243 extends into the rotor recess 203c so that the compression element 204 is connected to the rotor of the electric element 203. The size is reduced by being inserted within the height range.

  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 is a space in the compression chamber 251. The refrigerant in the shell is sucked from the suction port 202a of the suction muffler 202 by enlarging and reducing the size, and the discharge muffler formed in the cylinder block 250 via a valve (not shown) provided inside the cylinder head 252. 253, the discharge pipe 254, and the discharge tube 270 are discharged to the discharge pipe 31 outside the shell.

  The discharge pipe 254, which is a high-pressure pipe, is a steel pipe having an inner diameter of 1.5 mm to 3.0 mm, and is formed so as to be flexible by using an L-shape or a U-shape bend. Are connected with elasticity.

  The electric element 203 uses an inverter motor using a permanent magnet for the rotor 203a. In conventional induction motors, torque required for operation of the compressor 100 is not generated unless the thickness of the stator 203b and the rotor 203a is large. However, an inverter motor using a permanent magnet is used for the rotor 203a. By using it, the exciting current necessary for generating the rotational torque is not required, so that the thickness of the stator 203b and the thickness of the rotor 203a can be reduced, and the electric element 203 can be made compact.

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

  When the compressor is energized, 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, and the piston 260 is compressed into the compression chamber 251. The refrigerant is sucked and compressed while changing the internal volume.

  The volume of the piston 260 that is sucked and discharged during one reciprocation in the compression chamber 251 is referred to as a cylinder volume, and the cooling capacity varies depending on the cylinder volume.

  Next, the case where the refrigerator is tilted by transportation or the like with the compressor stopped will be described.

  When the compressor 100 is not operated for a long time, the R600a is liquefied to become a liquid refrigerant 290 and stored in the upper part of the oil 210, which is mineral oil having a higher specific gravity than the liquefied R600a. 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 liquefied in this way, the same applies to a combination of a CO2 refrigerant and ester oil or ether oil. On the other hand, for example, in the case of R134a and ester oil generally used as a conventional refrigerant, the vertical relationship between the oil and the liquid refrigerant is reversed, the liquid refrigerant is stored in the lower part, and the ester oil is stored in the upper part. The

  In the compressor 100 using a combination of a refrigerant and oil of a type in which the liquid refrigerant 290 is stored in the upper portion of the oil 210 as in the present embodiment, when the compressor 100 is tilted, the inner wall surface of the lower shell 201 is almost the same. When the oil 210 stored in the lower part reaches the suction pipe 200 opened on the same surface, it easily flows out of the shell, so that the oil 210 inside the shell decreases and the oil surface height decreases. End up.

  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 there is a possibility that the sliding portion may be worn and the reliability may be lowered. was there.

  In order to solve this problem, the present invention uses R600a which is a refrigerant whose refrigerating capacity per unit volume is about 1/2 that of R134a and about 1/20 that of CO2. As a result, in order to obtain a refrigerating capacity equivalent to that of R134a and CO2, the cylinder volume is increased to about twice that of R134a and to about 20 times that of CO2, so the piston displacement of the compressor is also equal to this cylinder volume. It increases in proportion to the increase. That is, since the volumetric flow rate of the refrigerant per unit time increases, the flow velocity in the pipe when the refrigerant passes through the refrigeration system is about twice as high as that of R134a and about 20 times that of CO2. Therefore, the oil 210 staying in the refrigeration system can be quickly returned to the compressor 100, and an insufficient amount of oil in the shell can be prevented.

  In addition, regarding such a decrease in the oil level of the refrigerator due to the transportation of the refrigerator, the rotation speed of the compressor is commercialized for 5 minutes or more, which is at least half of about 10 minutes immediately after the compressor is turned on. When an inverter device that is driven at a rotational speed higher than the power supply frequency is used, the piston displacement of the compressor increases due to the high rotation speed, thereby increasing the flow velocity in the piping when the refrigerant passes through the refrigeration system. Therefore, the oil 210 staying in the refrigeration system can be returned to the compressor 100 more quickly, and an insufficient amount of oil in the shell can be prevented.

  Further, in the compressor 100 of the present embodiment, the compressor is downsized in the height direction, and the compressor of the present embodiment is compared with the total height of 190 to 200 mm of a conventional general small compressor. 100 is designed to be downsized in the height direction to about 145 mm.

  When miniaturizing the overall height of such a compressor, in order to avoid a decrease in reliability, the oil level of the amount of oil enclosed in the compressor is equivalent to that of a general conventional small compressor. Since the oil level of the conventional compressor is about 12 to 13% because the height of about 30 mm is secured, in the small compressor of the present embodiment, the oil with respect to the total height of the compressor. The oil level height has increased to about 17%, and oil spilling when the compressor is tilted has become a bigger problem.

  In response to this problem, the compressor 100 according to the present embodiment reduces the size of the compressor by reducing the height of the compression element 204 and the electric element 203 in order to achieve a reduction in size.

  That is, the portion of the support portion 205 that elastically supports the mechanical portion composed of the compression element 204 and the electric element 203 is not taken in as a height reduction element, and the mechanical portion of the compression element 204 and the electric element 203, that is, the internal components are high. By reducing the height, consideration is given to the fact that the oil 210 does not buffer with the electric element 203 of the machine part and the fluctuation of the oil level hardly occurs.

  As described above, in the embodiment in which the compressor 100 is arranged at the upper part of the refrigerator main body, regarding the downsizing of the compressor 100 in the height direction, which is a big problem, the oil outflow is promoted particularly among the elements and viewpoints for downsizing. In other words, it employs a unique combination of the above-described miniaturization elements for maintaining reliability related to oil spill suppression.

  In addition, the oil 210 can be prevented from flowing out by ensuring a dimensional relationship equivalent to or higher than that of the conventional compressor with respect to the height from the uppermost portion of the oil surface of the oil 210 to the opening of the suction pipe 200. For example, the opening position of the suction pipe 200 to the shell is located above ½ height with respect to the maximum height in the shell, so that the effect of preventing oil outflow when the compressor 100 is inclined is obtained. Can be bigger.

  Further, in the present embodiment, 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. Since the portion 220 and the upper shell or the lower shell 201 are in contact with each other, the mechanical portion including the large compression element 204 and the electric element 203 is not greatly inclined. Accordingly, 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, so that the oil 108 can be prevented from easily flowing out from the suction pipe.

(Embodiment 9)
FIG. 17: has shown schematic sectional drawing of the compressor mounted in the refrigerator in Embodiment 9 of this invention. In addition, the same code | symbol is attached | subjected about the same structure as background art.

  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. 136 to the inside. Further, the inner side of the shell of the suction pipe 106 has a bent portion facing upward, and opens upward in the shell and is connected to a spring 106a which is an elastic member.

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

  With the direct suction configuration as described above, even when the compressor 100 is inclined, a minute space such as a gap in the cylinder 136, a valve gap in the cylinder head 135, and an oil 108 return hole (not shown) provided in the suction muffler 139. Only through the oil 108, backflow outflow of the oil 108 occurs.

  If the suction pipe 106 and the suction muffler 139 are joined by a tightly wound spring, the transmission of compression vibration is reduced, and the oil 108 can also reduce the outflow from the spring gap due to viscosity. It is possible to reduce the backflow.

  In this embodiment, a spring is used as an elastic member for connecting the suction pipe 106 and the suction muffler 139. However, an elastic resin such as rubber may be used.

  As described above, the refrigerator according to the present invention can prevent the oil outside the compressor from flowing out when the refrigerator has a refrigeration cycle in which the compressor is disposed above the evaporator, and therefore the refrigerator oil in the compressor is insufficient. It is useful as a refrigeration cycle configuration of a storage room equipped with a refrigerator for business use, a vending machine, and other cooling devices as well as a home refrigerator.

Schematic sectional view of the refrigerator in the first embodiment of the present invention. Schematic rear view of the refrigerator in the first embodiment of the present invention Schematic component development view of the refrigerator according to Embodiment 1 of the present invention. Schematic perspective view of the main part of the suction pipe of the refrigerator according to Embodiment 1 of the present invention. Schematic sectional view of the compressor mounted on the refrigerator in Embodiment 1 of the present invention. Schematic sectional view of the state of transport of the refrigerator in Embodiment 1 of the present invention Schematic sectional view of the compressor during refrigerator transportation in Embodiment 1 of the present invention Schematic sectional view of the compressor mounted on the refrigerator in Embodiment 2 of the present invention Schematic perspective view of essential parts of a suction pipe of a refrigerator in Embodiment 3 of the present invention Schematic perspective view of the main part of the suction pipe of the refrigerator in the fourth embodiment of the present invention. Schematic perspective view of main parts of a suction pipe of a refrigerator in a fifth embodiment of the present invention Schematic perspective view of main parts of a suction pipe of a refrigerator in a fifth embodiment of the present invention Schematic perspective view of essential parts of a suction pipe of a refrigerator in a sixth embodiment of the present invention Schematic sectional view of the compressor mounted on the refrigerator in the seventh embodiment of the present invention. Schematic sectional view of a compressor mounted on the refrigerator in the eighth embodiment of the present invention. Plan sectional drawing of the compressor mounted in the refrigerator in Embodiment 8 of this invention. Schematic sectional view of a compressor mounted on a refrigerator in Embodiment 9 of the present invention 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 Room Drawer Door 8 Cooling Fan 9 Evaporator 11,100 Compressor 13 Inner Box 14 Outer Box 15 Heat Insulator 25 Bottom Panel 26 Back Panel 27 Recessed Part 28 Machine Room Panel 29 Bottom Handle 30 Rear handle 31 Machine room fan 32 Capillary 33, 106, 200 Suction pipe 34 Top cover 36 Oil spill prevention trap 37 Pipe U bent part 38, 102, 201 Lower shell 39, 101 Upper shell 40 Compressor shell 40a Shell joint Portions 44, 63, 107 Discharge piping 45, 108, 210 Oil 47, 109 Motor 49, 111 Stator 50, 112 Rotor 51 Eccentric shaft 52 Shaft 53 Bearing 54, 135 Cylinder head 55, 136 Cylinder 56 Piston 57 Rod 58 Sliding 59 chamber 60 suction pipe compressor connecting portion 61 suction pipe weld connection 62 compressor (internal pressure type compressor)
65 Condenser 66 Discharge Piping Connection 67 Top Panel Duct Cover 68 Suction Opening 69 Discharge Opening 104 Rotation Drive (Internal Component)
105 Compression unit (internal component)
132 B bearing (tilt prevention means)
134 A bearing 139 Suction muffler 203 Electric element (internal component)
203a Rotor 204 Compression element (internal component)
205 Supporting part 243 Bearing part

Claims (6)

  A heat insulation 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 series of refrigerant flow paths, and internal components in the compressor. And an oil enclosed in a space containing the electric element and the compression element, the compressor is an internal low pressure type, and the electric element is an inverter electric motor using a permanent magnet as a rotor, and the compression By inserting the bearing portion of the element within the height range of the rotor of the electric element, the height direction of the component other than the support portion that supports the internal component consisting of the electric element and the compression element The evaporator is disposed on the top surface of the heat insulation box, the evaporator is provided below the compressor, and is connected to a suction pipe connecting the compressor and the evaporator. Is from inside the compressor to the evaporator side Refrigerator oil outflow prevention trap for preventing the outflow of the oil is provided.   The internal low-pressure type compressor includes an upper shell and a lower shell that are divided into two parts, and after storing internal components therein, the upper shell and the lower shell are hermetically joined at a shell joint, The refrigerator according to claim 1, wherein the suction pipe provided on the shell side opens into the compressor substantially on the same surface as the inner wall surface of the lower shell.   The refrigerator according to claim 1 or 2, wherein a refrigerant is enclosed in the refrigeration cycle, and the refrigerant has a lower specific gravity than the oil enclosed in the compressor in a liquefied state.   The refrigerator according to any one of claims 1 to 3, wherein the refrigerant sealed in the refrigeration cycle is R600a, and the oil sealed in the compressor uses mineral oil.   The refrigerator according to any one of claims 1 to 4, wherein the heat insulating box is provided with a recessed portion at the rear of the top surface, and the recessed portion is provided with a compressor and an oil outflow prevention trap.   6. 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. A refrigerator according to claim 1.

Images