JP2007057129A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator preventing a reverse flow of refrigerating machine oil from a compressor arranged on a top face. <P>SOLUTION: In the refrigerator, a recessed part 27 is provided in a top face rear of a heat insulating box 1 to arrange the compressor 11 of an internal low pressure type, and an oil outflow preventing mechanism 36. It is provided with an evaporator 9 provided in a lower part near to the compressor 11, and a suction pipe arrangement 33 connecting the compressor 11 and the evaporator 9. The oil outflow preventing mechanism 36 is provided in the suction pipe arrangement 33. When tilting the refrigerator on its side to carry it in refrigerator transportation or transfer, the compressor 11 will also be tilted, but a reverse flow of the refrigerating machine oil 45 can be prevented by the oil outflow preventing mechanism. By this, oil supply to a compressor sliding part in the compressor 11 is secured, and risk such as damage of the compressor can be further reduced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a refrigerator in which a compressor is disposed above a heat insulating box.

  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. 12 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.

Since 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, the refrigerator compartment 2 and the vegetable compartment inevitably have a constant internal volume of each storage compartment. The position of the partition wall of 3 can be lowered | hung below, and the taking-out of the storage 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, oil flows backward from the compressor when the refrigerator is carried over on its side and stays down after installation. There was a problem.

  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. A refrigerating cycle formed in the compressor, and the compressor has oil sealed in an internal low-pressure type, the evaporator being provided below the compressor, and connecting the compressor and the evaporator The pipe is provided with an oil outflow prevention mechanism for preventing the oil from flowing out from the compressor to the evaporator side, and the heat insulating box is provided with a recess at the rear of the top surface to prevent the compressor and the oil outflow. And a mechanism.

  As a result, when transporting and moving the refrigerator from the customer to the store, including the logistics from the delivery to the storefront, when the refrigerator is laid on its side, the compressor lies on its side, and the suction pipe opened inside the compressor Oil flows into the open end. However, since the suction pipe is provided with an oil outflow prevention mechanism, 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. As a result, the oil can be prevented from staying in the suction pipe and the evaporator below the compressor by the oil outflow prevention mechanism even if the refrigerator is raised and installed after transportation.

  In the refrigerator of the present invention, the compressor is arranged on the top of the refrigerator, and the oil is prevented from flowing out when the refrigerator is laid down on the suction pipe and the evaporator disposed below. It is possible to prevent the surface height from being greatly reduced, to secure oil supply to the compressor sliding portion, and to further reduce 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, The compressor has oil enclosed in an internal low-pressure type, the evaporator is provided below the compressor, and a suction pipe connecting the compressor and the evaporator is provided inside the compressor. An oil outflow prevention mechanism for preventing the oil from flowing out from the evaporator to the evaporator side is provided, and the heat insulating box is provided with a recess at the rear of the top surface, and the compressor and the oil outflow prevention mechanism are provided. Therefore, when transporting and moving the refrigerator from the customer to the store, including the logistics from the delivery to the storefront, when the refrigerator is laid down and carried, the compressor also lies on its side, and the suction pipe opened inside the compressor Oil flows into the open end. However, since the suction pipe is provided with an oil outflow prevention mechanism, 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. As a result, even if the refrigerator is raised and installed after transportation or the like, the oil outflow prevention mechanism 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.

  The invention according to claim 2 is the invention according to claim 1, wherein the oil spill prevention mechanism is a check valve, and even when the refrigerator is laid down by carrying or transferring the refrigerator, The simple check valve mechanism can prevent oil from staying in the suction pipe and the evaporator below the compressor.

  The invention according to claim 3 is the invention according to claim 1, wherein the oil spill prevention mechanism is a chamber, and is compressed even when the refrigerator is carried sideways by carrying or moving the refrigerator. Oil can be prevented from flowing out of the machine, and sudden liquid return can be buffered during operation to prevent damage to the compressor.

  The invention according to claim 4 is the invention according to claim 1, wherein the oil spill prevention mechanism is a solenoid valve, and the refrigerator is laid down on its side by transportation or relocation by stopping the power supply of the refrigerator. Even when carrying around, the oil can be prevented from flowing out of the compressor, and the fluid can be flowed or stopped arbitrarily with an electrical signal, providing excellent responsiveness and controllability, and interlocking with other control systems during refrigerator operation Therefore, liquid return can be prevented and the compressor can be operated with excellent reliability.

  The invention according to claim 5 is the invention according to claim 1, wherein the oil spill prevention mechanism is a flap utilizing gravity, and when the refrigerator is laid down and carried by transporting or moving the refrigerator In addition, it is possible to prevent oil from flowing out with a flap, to prevent oil from staying in the suction pipe and the evaporator below the compressor, and because the mechanism is simple, pressure loss is small and energy saving can be achieved during operation. .

(Embodiment 1)
FIG. 1 shows a schematic cross-sectional view of the refrigerator in Embodiment 1 of the present invention, FIG. 2 shows a schematic rear view of the refrigerator in the same embodiment, and FIG. 3 shows the refrigerator in the same embodiment. 4 is a schematic perspective view of the main part of the suction pipe of the refrigerator in the embodiment, and FIG. 5 is a schematic sectional view of the compressor mounted on the refrigerator in the embodiment. FIG. 6 shows a schematic cross-sectional view of the refrigerator transported state in the same embodiment, FIG. 7 shows a schematic cross-sectional view of the compressor during the refrigerator transport in the same embodiment, FIG. 8 shows a schematic side view of the check valve of the oil spill prevention mechanism of the refrigerator in the embodiment, and FIG. 9 shows a schematic side view of the chamber of the oil spill prevention mechanism of the refrigerator in the embodiment. Figure 10 shows the same Shows a schematic side view of a solenoid valve of the refrigerator oil outflow prevention mechanism in the form, FIG. 11 shows a schematic side view of the flap of the refrigerator oil outflow prevention mechanism in the same embodiment. In addition, the same code | symbol is attached | subjected about the same structure as a prior 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 in a compact manner and arranged in the middle between the inner box 13 and the back panel 26 so that the meandering portion comes to the back of the refrigerator compartment 2 and is insulated. 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 mechanism 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 arranged in a substantially vertical 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 equipment constituting the refrigeration cycle, and a predetermined amount of oil 45 and 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. 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 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 the control board in accordance with 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 escaping from 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 mechanism is not provided, the liquid refrigerant and the refrigerating machine 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, and the door will be opened unexpectedly during transportation, making it unsafe for the transporter, and dropping the internal parts and stored items. The problem 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. However, since the oil outflow prevention mechanism 36 is connected to the staying surface of the oil 45 during transportation, the oil 45 is connected to the inside of the suction pipe 33. There is no flow out into the evaporator 9. At the time of re-installation after transportation, the oil 45 in the oil outflow prevention mechanism 36 returns to the compressor shell 40 by gravity, and the suction pipe 33 is not left in a state of being 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 rise of the suction pipe 33 and cooling of the capillary 32 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, so that the circulation of the oil 45 is good, which is advantageous in terms of ensuring reliability.

  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 to form a handle shape. 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.

  FIG. 8 is a schematic side view of the check valve for the oil outflow prevention mechanism of the refrigerator according to Embodiment 1 of the present invention.

  In FIG. 8, a check connected between the first suction pipe 33a connected from the evaporator 9, the second suction pipe 33b connected to the compressor 11, and the first and second suction pipes 33a and 33b. It consists of a valve 59.

  As a result, when the refrigerator is laid down and carried, the oil 45 moves due to the compressor 11 being laid down, and when the opening end of the second suction pipe 33b is submerged in the oil 45, the oil 45 is temporarily turned to the check valve 59. However, when the refrigerator is installed again, the oil 45 is returned to the compressor shell 40 when the operation is started, and is necessary because the flow into the first suction pipe 33a is prevented by the valve in the check valve 59. The 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.

  FIG. 9 is a schematic side view of the chamber in which the oil outflow prevention mechanism of the refrigerator in the first embodiment of the present invention is provided.

  In FIG. 9, each suction pipe provided between the first suction pipe 33a connected from the evaporator 9, the second suction pipe 33b connected to the compressor 11, and the first and second suction pipes 33a and 33b. The pipe diameter is larger than that of the pipes 33a and 33b, and the chamber 60 has an outer shape of 20 to 40 mm. The first suction pipe 33a is inserted from the lower side of the chamber 60, and the pipe projects into the inside just above the upper part to provide an open end. The second suction pipe 33b is inserted from the lower side of the chamber 60, and the pipe opening The end is arranged so as to be flush with the wall surface inside the chamber 60.

  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 60. However, since the outflow to the first suction pipe 33a is prevented by the pipe configuration in the chamber 60, 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.

  In addition, if the pipe inserted from the lower part protrudes inside and an oil return hole is provided in the vicinity of the lower end of the inner surface of the chamber 60, the oil stays in the chamber 60 and the liquid refrigerant returns to a transient state. 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, has the same function as an accumulator, and is in danger of damage to the compressor. Can be further reduced.

  FIG. 10 is a schematic side view of the solenoid valve in which the oil outflow prevention mechanism of the refrigerator in the first embodiment of the present invention.

  In FIG. 10, a solenoid valve connected between the first suction pipe 33a connected from the evaporator 9, the second suction pipe 33b connected to the compressor 11, and the first and second suction pipes 33a and 33b. 61.

  As a result, when the refrigerator is turned off and carried sideways, the oil 45 moves due to the compressor 11 lying sideways, and when the opening end of the second suction pipe 33b is submerged in the oil 45, the oil 45 is Although it once flows out from the electromagnetic valve 61, the flow into the first suction pipe 33a can be prevented by setting the valve to be closed when the electromagnetic valve 61 is not energized. The valve 61 is opened, and the oil 45 returns to the compressor shell 40 due to the pressure difference, 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.

  In addition, the electromagnetic valve 61 is excellent in responsiveness and controllability because the fluid can be flowed or stopped arbitrarily by an electrical signal. During operation of the refrigerator, the temperature of the evaporator 9 and the discharge temperature of the compressor 11 are detected by a temperature sensor. In conjunction with this control system, liquid return can be prevented and excellent reliability operation is possible for the compressor.

  The solenoid valve 61 is preferably a direct acting type that can be opened and closed even when the pressure difference between the front and rear of the power supply and the compressor 11 is zero.

  FIG. 11 is a schematic side view of the flap of the oil outflow prevention mechanism of the refrigerator according to Embodiment 1 of the present invention.

  In FIG. 11, a flap 62 connected between the first suction pipe 33a connected from the evaporator 9, the second suction pipe 33b connected to the compressor 11, and the first and second suction pipes 33a and 33b. Consists of.

  As a result, when the refrigerator is turned off and carried sideways, the oil 45 moves due to the compressor 11 lying sideways, and when the opening end of the second suction pipe 33b is submerged in the oil 45, the oil 45 is Although it flows out to the flap 62 once, the flap 62 is pushed in the pipe by the gravity of the oil 45 and is closed in the horizontal direction with respect to the pipe direction, so the outflow to the first suction pipe 33a is prevented by the flap 62. When the refrigerator is installed, when the operation is started, the oil 45 returns to the compressor shell 40, and a necessary amount is secured. The material of the flap 62 is preferably a material that is lightweight and excellent in oil resistance.

  Also, during operation, the suction of the compressor 11 causes a pressure difference in the pipe to cause a flow, and the flap 62 having a simple mechanism and light weight can be easily opened in parallel to the pipe direction (arrow). Since the pressure loss can be kept low, it is efficient and energy saving.

  As described above, the refrigerator according to the present invention can prevent the oil outside the compressor from flowing out when the compressor has a refrigeration cycle arranged above the evaporator, so that the refrigerator oil in the compressor is insufficient. The risk can be reduced, and it is useful as a refrigeration cycle configuration of a storage room equipped with not only a home refrigerator but also a commercial refrigerator, a vending machine, and other cooling devices.

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 side view of a check valve of the oil outflow prevention mechanism of the refrigerator in Embodiment 1 of the present invention Schematic side view of the chamber of the oil spill prevention mechanism of the refrigerator in Embodiment 1 of the present invention Schematic side view of the solenoid valve of the oil outflow prevention mechanism of the refrigerator in Embodiment 1 of the present invention The schematic side view of the flap of the oil outflow prevention mechanism of the refrigerator in Embodiment 1 of this invention Schematic sectional view of a conventional refrigerator

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat insulation box 9 Evaporator 11 Compressor 27 Recessed part 32 Capillary 33 Intake piping 36 Oil outflow prevention mechanism 45 Oil 59 Check valve 60 Chamber 61 Electromagnetic valve 62 Flap

Claims (5)

  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 connected in order to form a series of refrigerant flow paths; and the compressor is a low-pressure type inside. The evaporator is provided below the compressor, and a suction pipe connecting the compressor and the evaporator is connected to the evaporator side from the compressor to the suction pipe. An oil outflow prevention mechanism for preventing oil outflow is provided, and the heat insulating box is provided with a recess at the rear of the top surface, and the compressor and the oil outflow prevention mechanism are provided.   The refrigerator according to claim 1, wherein the oil outflow prevention mechanism is a check valve.   The refrigerator according to claim 1, wherein the oil outflow prevention mechanism is a chamber.   The refrigerator according to claim 1, wherein the oil outflow prevention mechanism is a solenoid valve.   The refrigerator according to claim 1, wherein the oil outflow prevention mechanism is a flap using gravity.

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