KR20020000799A - Refrigerating system for domestic refrigerating appliances - Google Patents

Abstract

The present invention relates to a refrigeration system for a domestic refrigeration apparatus implemented using an electric compressor and a flow device with a reciprocating compressor piston. It is an object of the present invention to produce a refrigeration system for a domestic refrigeration apparatus that can be manufactured at low technical cost, can be used in a variety of applications without extensive modifications, and which makes best use of theoretical circulation processes. The object is a hermetically sealed electric compressor, a condenser having a pressure side connected to the electric compressor, a capillary tube having an outlet side connected to the condenser and being in thermal contact with a suction tube of the electric compressor, thermally connected with a PCM device, and a suction side with the electric compressor. It is achieved by a refrigeration system for a domestic refrigeration device, consisting of an evaporator connected to the capillary and a cooling fan for enhancing convection in the cooling section of the cooling device. In the refrigeration system according to the invention the outlet of the evaporator is guided to a flow device connected to the air inlet of the motor-driven compressor, the motor-driven compressor and the device being elastically supported in the soundproof cover and mounted on the chassis, mounted thereon The maximum overall height of the chassis, including the components and the sound insulation cover, matches the reference height of the refrigeration unit. The object of the invention is also achieved by forming a hermetic compressor, a reciprocating compressor piston and a flow arrangement according to the invention.

Description

Refrigeration system for home refrigeration unit {REFRIGERATING SYSTEM FOR DOMESTIC REFRIGERATING APPLIANCES}

In domestic refrigeration systems, a refrigeration system is usually used which operates according to the principles of a compression refrigeration machine and thus comprises a refrigerant circulation system, which consists of a compressor with a suction damper and / or a pressure damper, a condenser and an evaporator. In this system, a capillary tube is disposed between the condenser and the evaporator of the domestic refrigeration apparatus as an expansion control device. The aforementioned elements of the refrigerant circulation system are known in as many embodiments as the manner in which the elements are arranged in the refrigeration apparatus. In many embodiments the refrigeration apparatus is typically arranged at the base of the apparatus, except for the evaporator which is integrated into or forms the rear wall of the apparatus. However, in the known refrigeration systems for household refrigeration apparatus, the manufacture of the refrigeration apparatus is technically complicated by the fact that each element itself is mounted in a place provided for a given use and a refrigerant system is created by corresponding lines. The disadvantage is the high cost. A solution in this regard is to arrange the refrigeration system as a group of parts which can be pre-assembled, as is known, for example, from German Utility Model 92 06 167. The known solution relates to a refrigerator and / or a freezing vessel in which a condenser and a compressor are provided therein and have a base portion ventilated by a cooling fan. The condenser, compressor and cooling fan are arranged in one closed air channel, the inlet and outlet openings of the channel being closed by a porous and / or lattice shaped plate, arranged on the base side, and having a door or flap valve. Covered by The side walls of the air channel are covered with a sound absorbing material, and the air channel itself consists of a tube in the form of a housing bent in a u-shape and is supported by the elastic or elastomeric member on the surrounding base box or in the same way. It is supported at the bottom of the base box. The known solution also proposes a method in which the compressor and / or condenser are coupled to the wall of the air channel or supported on the bottom of the air channel via an elastic or elastomeric member.

A disadvantage of this known solution is that the arrangement of the functional members arranged in the base part requires the entire inner chamber for the member, so that the damping of the noise in particular requires a fairly high cost. Furthermore, since the known solution has been developed for the structure of the bottom part of a given refrigeration apparatus, at least structural modifications are required for use with other types.

The storage conditions of the product to be frozen are very important in terms of the use characteristics of the domestic refrigeration apparatus. In conventional household refrigeration apparatus, the adjustment of the refrigeration section temperature is achieved by connecting or disconnecting the compressor for a fairly short period of time. That is, it is made by the intermittent operation | movement of a cooling apparatus. As a result, however, especially when fresh foods are stored, the temperature of the freezing section changes significantly with the drying of the moisture of the product to be frozen due to the significant difference between the temperature of the storage chamber and the temperature of the evaporator surface. Turning from intermittent operation is made possible by using an evaporator with a PCM device, as known from German Patent Application Publication No. 39 26 250. The evaporator of this type is enclosed by a refrigerated reservoir filled with a cooling storage agent which has a phase change point at a predetermined temperature and which corresponds to the heat absorption of the refrigerating device which is within a predetermined time with a heat capacity of at least several hours. The operation of the compressor can thus be regulated in a narrow range near the phase inversion temperature, and particularly preferably a fan for forced convection improves the heat transfer between the evaporator surface and the cooling section. This achieves a high temperature retention in the storage section, a fast freezing rate and a significant reduction in the moisture deodorizing power of the product to be frozen.

However, the use of evaporators with PCM units, as well as the compact arrangement of refrigeration system components, is not suitable for reducing the manufacturing costs of domestic refrigeration units on the one hand, on the other hand, while at the same time low power consumption. In recent years, the demand for reducing the use of environmentally damaging materials that can lead to high refrigeration performance is increasing and is not suitable for applying theoretical cyclic processes to the processes of actual refrigeration systems.

The present invention relates to a hermetic electric compressor, a compressor piston and a flow device, and a refrigeration system for a domestic refrigeration device implemented using the electric compressor and the flow device having a piston.

1 is a block circuit diagram of a refrigeration system according to the present invention,

2 is a schematic view of a hermetic compressor according to the present invention,

3 is a schematic representation of a flow apparatus according to the invention,

4 is a schematic view of a compressor piston according to the invention,

5 is a block circuit diagram of a refrigeration system according to the present invention with a cylinder cooling device,

6 is a schematic view of a hermetic compressor according to the invention with a cylinder cooling device.

It is an object of the present invention to produce a refrigeration system for a domestic refrigeration apparatus that can be manufactured at low technical cost, can be used in a variety of applications without extensive modifications, and which makes best use of theoretical circulation processes.

The object is a hermetically sealed electric compressor, a condenser having a pressure side connected to the electric compressor, a capillary tube having an outlet side connected to the condenser and being in thermal contact with a suction tube of the electric compressor, thermally connected with a PCM device, and a suction side with the electric compressor. Achieved by a refrigeration system for a domestic refrigeration apparatus which is connected to the capillary and forms a refrigeration circuit filled with a refrigerant, comprising an evaporator connected to the capillary and a cooling fan for enhancing convection within the cooling section of the cooling apparatus, the outlet of the evaporator Is guided to a flow device connected to the air inlet of the motor-driven compressor, wherein the motor-driven compressor and the device are elastically supported on the chassis within the soundproof cover, the maximum overall of the chassis including the components mounted thereon and the soundproof cover. The height corresponds to the reference height of the refrigeration unit. A preferred embodiment of the refrigeration system according to the invention is the case where the maximum overall height of the chassis including the components mounted thereon and the soundproof cover is 100 mm.

The object of the invention is also achieved by forming the elements of the refrigeration system in a manner according to the invention.

The formation method according to the invention relates to a hermetic electric compressor comprising a capsule bottom and a capsule cover connected to each other in a sealed manner. A drive motor is disposed inside the capsule, and the power supply of the drive motor is guided through the capsule cover in a sealed manner. The capsule cover and the cylinder part are coupled in a sealed manner, in which case an intake valve is arranged inside the cylinder head. The stator packet of the drive motor is pressed into the capsule cover. One tube is fixedly disposed between the capsule bottom and the capsule cover, and the inner chamber of the tube is connected to the capsule inner chamber and the pressure tube using at least one outer through hole. The tube is used as a bearing shaft for the rotor packet of the drive motor. The upper bearing shell of the rotor is formed as a cylindrical plate, disposed eccentrically with respect to the tube axis, and the connecting rod bearing acts as a stroke plate by surrounding the outer surface of the cylindrical plate. The connecting rod pivotally connected to the connecting rod bearing is fixedly coupled to the piston reciprocating in the cylinder. The piston is provided with a pressure valve. The rotor packet can compensate for the amount of vibration in an appropriate manner. In one embodiment of the motor-driven compressor according to the invention, at least one injection in which the cylinder part is connected with a flow section through which the liquid refrigerant flows, the flow section further penetrating the cylinder wall slightly above the lower dead center position of the piston It is configured to be connected to the stroke chamber of the piston through the bore. Preferably, the connection between the stroke chamber of the piston and the flow section is arranged at a crank angle of approximately 20 ° above the lower dead center position of the piston. The input side of the flow section is connected by a capillary to the connection line of the condenser, while the outlet of the flow section is connected into the condenser inlet or into the pressure tube.

For a motor-driven compressor according to the invention, a compressor piston is provided which characterizes the invention, which piston is arranged in fixed engagement with a reciprocating connecting rod and comprises a sealing lip in contact with the inner wall of the cylinder, during which the flow channel is closed. A valve is provided in the flow channel for the coolant that opens and closes the flow channel during the intake stroke. In this case, the guide member formed in the shape of a bell is fixed to the connecting rod which reciprocates, and the guide member is formed in a cylindrical shape and has an axially arranged surface area. On the side of the guide member facing towards the compression chamber, a piston bottom which is flattened while protruding radially from the guide member is arranged. In the cylindrical region of the guide member, the edge facing away from the piston bottom is bent around the inner wall of the cylinder, in which case the guide member is surrounded by a sealing ring slidably disposed on the cylindrical outer surface, the sealing ring being Has an edge in contact with the cylinder inner wall. The guide member is provided with a through hole, the opening of the compression chamber side of the through hole being opened by the sealing ring during the compression stroke and covered by the sealing ring during the suction stroke. The connecting rod has a length of at least eight times the crank radius.

The object of the invention is also a flow consisting of a liquid separator having an intake pipe connected to the evaporator outlet of the refrigeration system and having a liquid collecting vessel therein and a suction damper connected to the liquid separator and connected to the air intake of the compressor of the refrigeration system. By the formation of the device. The suction damper is formed as an internal back heat transfer. A riser is disposed inside the liquid collection vessel, which is connected as an injection channel inside the air inlet of the compressor. As the outlet opening of the flow device is directly connected with the air inlet of the compressor, the flow device according to the invention is preferably formed. The internal countercurrent heat transfer consists of a capillary tube and a suction tube of a refrigeration system connecting the evaporator and the condenser, the capillary tube being wound around the suction tube in double. A preferred embodiment of the flow device according to the invention is that And the cover functions as a resilient support and sound insulation for the flow device and the hermetic compressor in addition to the function as the thermal separator, so that the flow device is formed of a closed part that is thermally separated from the surroundings.

Limiting the overall height of the refrigeration system according to the invention to the reference height of the domestic refrigeration system and the compact configuration and arrangement of the hermetic compressor, condenser and flow device are prerequisites for application to the refrigeration apparatus of various embodiments. The assembly of the device and the refrigeration system, except for the configuration of the evaporator, takes place irrespective of the manufacture of the refrigeration apparatus. The elements, and in particular hermetic compressors, consist of a few parts that can be easily assembled. The liquid container disposed inside the flow device eliminates the need for optimizing the refrigerant charge amount, rather in this regard the self-regulating method is achieved in such a way that the compressors respectively suck in the optimum amount of refrigerant. Strongly reducing the amount of lubricating oil is on the one hand important in view of the demand for greater environmental friendliness, since oil is only needed for lubrication and not for exhausting compressor losses. On the other hand, by forming the compressor in a hermetic form, it is not necessary to have a loss heat dissipation function on the capsule surface, and instead, the level of noise can be lowered to a lower level by using a secondary sound insulation measure. By taking secondary sound insulation measures around the hermetic compressor, it becomes possible to simultaneously elastically support the hermetic compressor and the flow device within the chassis of the refrigeration system.

The process of the refrigeration system according to the invention is further optimized in such a way that, besides using an evaporator with a PCM device, the refrigerant is overheated to ambient temperature to achieve high refrigeration performance and to avoid unspecified liquid intake of the compressor. Is done. In this case, the superheated heat is not drawn off from the surroundings, but rather is obtained by cooling the condensed refrigerant below the freezing point using a countercurrent heat transfer. The overall action based on energy theory is characterized by the fact that the compression starts at ambient temperature and is basically isentropic, but in the case of injecting a liquid refrigerant underunderabaabatic. The loss of the compressor is then minimized and provided to the refrigerant after compression. The mass flow of intake gas sucked by the compressor is condensed in the stroke chamber and reaches the chamber inside the capsule via a pressure valve placed in the piston according to the co-current flow principle. The piston bottom is firmly fixed to the connecting rod so that the piston force matches the power of the connecting rod, so that no vertical force is created from the process power causing wear. The power of the connecting rod is lower than in conventional propulsion device formations. The result is that less moment is required of the drive motor. Since the sealing ring has the maximum sliding ability, and the size of the face of the sealing ring in contact with the cylinder inner wall due to the formation as a lip is small, the frictional loss formed between the piston and the cylinder is minimized. Nevertheless, the friction is sufficient to prevent the axial vibration characteristics of the sealing ring, so that the function as a pressure valve of the sealing ring is met without impact, even without the valve spring, because the inertia force of the sealing ring is This is because it causes a closing pressure. The stroke gap surface of the pressure valve realized using the sealing ring can be selected so large that the flow loss is kept to a minimum without expanding the damage chamber, because the sealing ring is disposed outside the compression chamber. Unlike conventional propulsion device formation, by reducing the reciprocating mass by 1/15 to 1/35, significant acoustical improvements are achieved in the operation of the stroke piston compressor in addition to the reduction in manufacturing costs. A cocurrent compressor implemented with a suction valve in the cylinder head and a pressure valve in the piston is characterized in that heating of the suction gas is almost completely avoided on the path of the compressor connected into the cylinder. The front of the piston, which can be formed completely flat, ensures minimal damage volume upon condensation. By means of the pressurized gas atmosphere in the capsule inner chamber and the desired pressurized gas guide, special pressure dampers for reducing pressure fluctuations can be abandoned. The pressurized gas flows through the stator packet, the ring gap between the stator and the rotor, the rotor bearing and the ring chamber inside the rotor, from the ring chamber through the outer through bore to the inner chamber of the shaft and from there the pressure tube. This leads to the interior, where pressurized gas absorbs engine heat loss on the path. The pressurized gas then flows through the condenser, the expansion capillary and the evaporator from which mass flow is drawn into the flow apparatus. When the mass flow is introduced into the liquid separator of the flow apparatus, the liquid components of the mass flow, which may contain not only oil but also liquid refrigerant, are separated. As the gas mass flow absorbs heat as it flows through the suction tube inside the flow apparatus, which is also a component of the backflow heat transferer, which also acts as a suction damper, the liquid mass flowing through the capillary is cooled below the freezing point and the air of the compressor It will reach inside the suction port. At this time, the liquid-oil-coolant-mixture is introduced into the intake gas stream through an injection channel connected to the air inlet, thereby achieving low thermal condensation. The low insulation method of reducing compressor losses is reinforced by further refrigeration of the cylinders. Further refrigeration may be guided through a flow section in which liquid refrigerant is thermally coupled with the cylinder, or when the piston reaches the lower dead center area to open the injection bore, the refrigerant further flows from the flow section through the injection bore into the stroke chamber. Furnace partially inhaled and evaporated in the stroke chamber. Similarly, spray lubrication is similar to lubrication of two-clock motors, as well as without the need for an oil burner device to provide sufficient oil to all support locations to ensure lubrication. Forming a compressor with an eccentric stroke plate, connecting rod bearings, connecting rods and, in particular, a piston fixedly coupled to the connecting rod and placing a pressure valve inside the piston is extremely extreme, as when using carbon dioxide (CO ₂ ) as a refrigerant This enables applications featuring high process power and process pressure.

One preferred embodiment of the refrigeration system according to the invention using the hermetic compressor according to the invention and the preferred embodiment of the flow apparatus according to the invention is described in detail with reference to the drawings.

The refrigeration system according to FIG. 1 of the present invention consists of a hermetic compressor 10 with a drive motor 101 and a compressor 102, in which an air inlet 44 (according to FIG. 3) of the compressor has a flow device 40. ) Is placed directly. The flow device 40 includes a suction damper 43 and a liquid separator 41 formed with an internal heat transferr, in which an injection channel 45 is locked into the liquid container of the liquid separator, and the channel is a compressor 102. ) Is connected to the center of the air intake 44 of. Inside the liquid filter 41, a suction pipe connected to the outlet of the evaporator 3 is connected in a manner of contact. As heat is received even when the refrigeration system is switched off, the evaporator 3 uses a PCM device to reduce the temperature difference between the evaporator surface temperature and the storage chamber temperature. In order to set a desired storage chamber temperature, convection may be forced by using a cooling fan (not shown) instead of using only a free convection scheme. The refrigerant inlet of the evaporator 3 is connected to the condenser 2 via a capillary tube 42. The capillary tube 42 is in thermal contact with the suction damper 43. A pressure tube 5 drawn out from the capsule of the hermetic compressor 10 to the outside in a hermetic manner is connected to the condenser 2. The refrigeration system according to the invention is designed as a compact part. Corresponding to this design scheme, the hermetic compressor 10, the flow device 40 and the condenser 2 are arranged on a chassis and have a total height of not more than 100 mm including a secondary sound insulation device. Is formed. The secondary sound insulation device is used to elastically support the hermetic compressor 10 and the flow device 40 on the chassis at the same time. The coupling point of the flow device 40 and the suction pipe 6 is formed so that there is no vibration in order to avoid excitation of the evaporator 3.

2 shows in schematic cross section a hermetic compressor 10 according to the invention. The capsule of the hermetic compressor 10 consists of a capsule bottom 11 and a capsule cover 12 joined together in a sealing manner. The capsule cover 12 is coupled to the cylinder part 13 in a sealed manner. The stator packet 14 of the drive motor 101 with the field winding 14 ′ is pressed into the capsule cover 12. A shaft tube 15 is disposed at the center between the capsule bottom 11 and the capsule cover 12. Preferably the capsule cover 12 is provided with a journal 12 ', on which the shaft tube 15 is compressed and arranged, and the capsule bottom 11 is formed with a bush 11' configured to receive the bearing in a preferred manner. Is provided, the shaft tube 15 is inserted into the bush. Approximately half of the length of the shaft tube 15 is provided with at least one radial through hole 16. In the region of the receiving bush 11 ′ of the capsule bottom 11, a pressure tube 5 withdrawn from the capsule bottom 11 in a sealed manner is connected into the inner chamber of the shaft tube 15. In the shaft tube 15, the rotor 18 of the drive motor having the upper bearing shield 19 and the lower bearing shield 20 is supported, in this case the front of the lower bearing 20 ', preferably embodied as a sliding bearing. The side is received by the bush 11 '. The upper bearing 19 'disposed in the journal 12' area can be formed as a gas bearing or a sliding bearing. The upper bearing shield 19 of the rotor 18 is embodied in a circular plate, which is arranged concentrically with respect to the tube axis and surrounded by the connecting rod bearing 21. The connecting rod bearing 21 is pivotally connected to the connecting rod 22 and a piston 23 is fixed to the connecting rod. The piston 23 moves in a translational manner inside the cylinder part 13 due to the stroke transmitted through the connecting rod 22, which is formed using the eccentric support action of the upper bearing shield 19. The piston 23 is shown in the bottom dead center position. The fixed connection of the connecting rod 22 and the piston 23 causes the piston 23 to reciprocate in an oblique state with respect to the cylinder axis, whereby the power of the piston is transmitted directly to the connecting rod 22, thereby providing the power of the rod. To match. That is, it is not separated into the vertical force component and the load power component. From this state, in the conventional case, the advantage that the abrasion action resulting from the normal force is reduced when forming the piston having the connecting rod pivotally supported on the piston bolt is reduced. The piston 23 is also provided with a pressure valve as shown in FIG. 4, wherein the valve consists of a sealing ring 236 which is slightly movable in the axial direction to realize the co-flow principle of the refrigerant mass flow, with the cylinder head Suction gas containing liquid refrigerant and oil, drawn in through an unillustrated intake valve disposed therein, passes through a pressure valve in the piston 23 to reach the chamber inside the capsule to achieve spray lubrication of all bearing locations. As a result, the suction gas flows through the ring-shaped gap between the stator 14 and the rotor 18 and the upper rotor bearing 19 'to form a ring-shaped chamber between the rotor 18 and the shaft 15. 24, from which the suction gas reaches the inner chamber of the shaft tube 15 via the radial through hole 16, from which the pressure tube 5 is reached. In this way, the forced path of the pressurized gas flow formed inside the capsule affects the lubrication of all the bearing locations and the absorption of motor loss heat, so that the capsule itself does not have to meet the heat transfer function. This makes it possible to capture vibrations outside the capsule by using the elastic cover acting on sound insulation.

The flow device 40 according to the invention is shown in FIG. 3. The flow device consists of a cylindrical liquid separator 41 and a suction damper 43 formed of an internal heat transfer, connected in such a way that a suction pipe 6 connected to the outlet of the evaporator 3 is in contact with the liquid separator. The internal heat transferr 43 may be wound around the suction tube 6 before the inlet tube 6 is introduced into the helical flow body, and preferably into the flow apparatus 40 and the condenser 2 may be evaporated ( 3) and a double-wound section 47, which is squeezed inside the flow body of the capillary tube 42 which connects as an expansion coil, wherein the flow of suction gas flowing through the flow body is stabilized and at the same time the liquid separator 41. Damped inside. In the lower region of the liquid separator 41, a liquid reservoir 46 is formed, and a riser is locked into the reservoir, which rises as an injection channel 45 and inside the discharge opening of the flow device 40. And an air inlet 44 of the compressor 102 is inserted into the discharge opening to seal seal with the flow device 40. A flow device which is used not only to damp the vibrations of the flow device 40 on the chassis but also to thermally separate the flow device from the surroundings, and preferably forms a unit with the cover of the hermetic compressor 10. The elastic cover of 40 is not shown. The real function of the flow device is to ensure that the process characteristics actually achieved are optimally approximated to the theoretical circulation process. At the same time, the assembly of the refrigeration system according to the present invention is simplified because of the liquid storage container 46 which serves as the refrigerant collector and the lubricant storage container, since it is not necessary to optimize the refrigerant charge.

4 shows a preferred embodiment of the piston according to the invention. This figure shows the cylinder wall 237 of the stroke piston compressor 102 (according to FIG. 1) in which the piston according to the invention reciprocates. Stroke movements are indicated by arrows indicated by dashed lines. The left side of the figure thus symbolically shows the piston during the compression stroke and the right side of the figure symbolically shows the piston during the suction stroke. The cylinder has a cylinder head, which is connected to the suction pipe 6 (according to FIG. 1) and disposed inside a suitable suction valve. The piston consists of a guide member 232 and a piston bottom 233, the guide member being formed in the shape of a bell and fixedly coupled with the connecting rod 22 on the side facing away from the crank, the piston bottom being guided It is firmly coupled with the member 232. It is technically possible to manufacture the connecting rod 22 and the guide member 232 integrally. The connecting rod 22 is linked to a crank driven by an electric motor. The front surface of the guide member 232 is formed in a ring shape, the piston bottom 233 is fixed flat to the front surface. In order to avoid jam of the cylinder inner wall 237 and the piston, the diameter of the piston bottom 233 is smaller than the diameter of the cylinder bore, because the piston fixedly connected with the connecting rod 22 is rotated by the crank rotation. This is because the reciprocating motion in the axial direction. The diameter of the guide member 232 is also smaller than the diameter of the piston bottom 233, in which case the guide member 232 starts from the ring front and coaxially and cylindrically to the connecting rod 22 around the member. And as such a sliding surface 234 facing the cylinder inner wall 237. The cylindrical surface of the sliding surface 234 of the guide member 232 is provided with a through opening 238 distributed at the same angle over the entire surface. The sliding surface area 234 is limited on the one hand by the rear of the peripheral area of the piston bottom 233 protruding above the guide member 232, while on the other hand the circumference is bent towards the cylinder inner wall 237 and stroke brakes. It is limited by the edge 235 used as. A sealing ring 236 made of polytetrafluoroethylene is disposed around the cylindrical region 234 of the guide member 232, which is attached to the first sliding edge and the cylinder inner wall 237 on the sliding surface 234. An adjacent second sliding edge. The side of the sealing ring 236 facing the rear of the piston bottom 233 is formed flat.

Since the friction is greater at the cylinder inner wall 237 than at the sliding surface 234, the position of the sealing ring 236 varies with the direction of stroke of the piston. At the end of the compression stroke, the sealing ring 236 is stopped by the stroke brake 235 to open the stroke clearance 239V. This state is shown symbolically on the left side of the figure. The opening timing can be varied by selecting the sealing ring 236 according to its sliding ability or by correspondingly embodying the surface of the sliding surface 234. When the stroke gap 239V is opened, the compressed refrigerant flows out of the condensation chamber 2310 and flows into the crank chamber 2311 through the stroke gap 239V and the through opening 238. The crank chamber 2311 is connected to the pressurized gas outlet 5 (according to FIG. 2) of the compressor via a motor chamber. The right side of the figure shows the position of the sealing ring 236 during the suction stroke of the piston. The sealing ring 236 is in flat contact with the rear surface of the piston bottom 233. This eliminates the stroke gap 239V and closes the through opening 238, resulting in the refrigerant being sucked into the condensation chamber 2310.

By forming the sealing ring 236 to have one sealing lip in contact with the cylinder inner wall 237 and the sliding surface 234, respectively, a sliding function is caused on the individual surface, which sliding function of the connecting rod 22 with respect to the cylinder axis. Function of the sealing ring 236 as a pressure valve to reliably seal the condensation chamber 2310 against the crank housing between the piston and the cylinder inner wall 237 even when the inclination is at a maximum and thus the inclination of the piston is at its maximum. Guarantees.

Unlike the embodiment shown in FIGS. 1 and 2, the embodiment of the refrigeration system according to the invention shown in FIGS. 5 and 6 includes an additional cylinder cooling device 51. Since the remaining formations are the same, the extent to which the description of Fig. 1 or Fig. 2 is cited. The further cylinder cooling device of the compressor 102 consists of a flow section 51 through which liquid refrigerant flows. The liquid refrigerant branches from the connection between the condenser 2 and the capillary 42 and flows through the flow section 51 and then flows back into the pressure tube 5 between the compressor outlet and the condenser inlet, in this case branching As well as countercurrent connections they can also be arranged in structurally suitable positions respectively. In FIG. 6, it can be seen that in addition to the flow section 51, the cylinder stroke chamber 2310 and the connection portion of the flow section are formed in the form of at least one injection bore 25. The injection bore 25 is present at a crank angle of 20 ° above the bottom dead center position of the piston 23. The injection bores are uniformly distributed over the circumference of the cylinder wall 237 (according to FIG. 4). The transition from the cylinder inner wall surface to the bore is formed to be as rough as possible.

Claims (15)

Hermetically sealed electric compressor, a condenser having a pressure side connected to the motor compressor, a capillary tube having an outlet side connected to the condenser and being in thermal contact with a suction tube of the electric compressor, thermally connected with a PCM device, and a suction side connected with a motor compressor, and the capillary tube A refrigeration system for a domestic refrigeration apparatus, comprising a refrigeration circuit filled with a refrigerant, comprising an evaporator connected to and a cooling fan for enhancing convection in the cooling section of the cooling apparatus. The outlet of the evaporator 3 is guided to a flow device 40 connected to the air intake 44 of the motor-driven compressor 10, wherein the motor-driven compressor 10 and the device 40 are located on the chassis inside the soundproof cover. And a maximum overall height of the chassis, including the components mounted thereon and the soundproof cover, that is resiliently supported on the refrigeration system. The method of claim 1, Refrigeration system, characterized in that the maximum overall height of the chassis including the components mounted on the chassis and the soundproof cover is 100mm. In a hermetic electric compressor comprising a capsule bottom and a capsule cover connected to each other in a sealed manner, a drive motor disposed inside the capsule and a power supply for the drive motor passing through the capsule cover in a sealed manner, The capsule cover 12 and the cylinder part 13 are connected in a sealed manner, a suction valve is disposed in the cylinder head, and the stator packet 14 of the drive motor 101 is pressed into the capsule cover 12. The pressure tube 5 is guided outwardly through the capsule bottom 11 in a sealed manner, and a tube 15 is fixedly disposed between the capsule bottom 11 and the capsule cover 12. The inner chamber is connected to the capsule inner chamber using a pressure tube 5 and at least one outer through hole 16, which tube 15 serves as a bearing axis for the rotor packet 18 of the drive motor 101. A piston 23 for reciprocating inside the cylinder 13, wherein a connecting rod bearing 21 surrounds an outer surface of the cylindrical plate and a connecting rod 22 pivotally connected with the connecting rod bearing 21. Connected, the pressure valve is provided to the piston 23, The upper bearing shell 19 of the E-18 are the hermetic electric compressor, characterized in that acting formed as cylindrical plates, in such a way in relation to the tube axis is disposed eccentrically as a stroke plate. The method of claim 3, wherein The rotor packet (18) is characterized in that it is suitably formed to compensate for the amount of vibration. The method according to claim 3 or 4, The cylinder component (13) is hermetic electric compressor characterized in that it is thermally coupled with the flow section 51 through which the liquid refrigerant flows. The method of claim 5, The flow section 51 is connected to the stroke chamber of the piston 23 via at least one injection bore 25 which penetrates the cylinder wall slightly above the lower dead center position of the piston 23. compressor. The method of claim 6, Sealed electric compressor, characterized in that the connecting portion (25) between the flow section (51) and the stroke chamber of the piston (23) is arranged at a crank angle of approximately 20 degrees above the lower dead center position of the piston (23). A piston for a refrigerant compressor inside a cylinder, wherein the condensation chamber of the compressor is connected to the suction pipe via an inlet valve, is arranged to be fixedly connected to the reciprocating connecting rod, and includes a sealing lip contacting the inner wall of the cylinder, the compression stroke A piston for a refrigerant compressor, configured to include a flow channel for a refrigerant having a valve that opens the flow channel during and closes the flow channel during the intake stroke. The reciprocating connecting rod 22 is fixed with a guide member 232 formed in the shape of a bell, and the guide member has a cylindrical shape and has an outer region 234 disposed along an axis and directed toward the condensation chamber 2310. On the side of the guide member 232 a piston bottom 233 is formed which is flat and protruding radially above the guide member, the other from the piston bottom 233 of the cylindrical region 234 of the guide member 232. Facing edge 235 is bent circumferentially towards the cylinder inner wall 237, the guide member 232 is surrounded by a sealing ring 236 slidably disposed on the cylindrical outer surface 234, the sealing ring The silver perimeter includes an edge that abuts the cylinder inner wall 237, and the guide member 232 is provided with a through hole 238, the opening of the condensing chamber side of the through hole being provided during the condensation stroke. A piston, which is opened by a sealing ring (236) and closed during an intake stroke, wherein the crank chamber (2311) of the compressor is connected with a pressurized gas outlet (5). The method of claim 8, Piston, characterized in that the length of the connecting rod (22) is at least eight times the crank radius. A flow device 40 consisting of a liquid separator 41 and a suction damper 43, into which the suction tube 6 connected to the evaporator outlet of the refrigeration system is connected, and the separator is a container for collecting liquid. The suction damper is connected to the liquid separator 41 and to the air inlet 44 of the compressor 102 of the refrigeration system, the suction damper 43 is formed as an internal countercurrent heat transfer, A riser is arranged inside the liquid collection vessel, the riser being connected to the inside of the air inlet of the compressor (102) as an injection channel (45). The method of claim 10, Flow apparatus characterized in that the outlet opening is directly connected to the air inlet (44) of the compressor (102). The method of claim 10 or 11, The internal counter flow heat transfer device comprises a capillary tube (42) and a suction tube (6) of a refrigeration system connecting the evaporator (3) and the condenser (2). The method of claim 12, The capillary tube (42) is a flow device, characterized in that wound around the suction tube (6) in the form of a double thread. The method according to claim 10, 11, 12 or 13, A flow device, characterized in that it is formed from a closed part that is thermally separated from the periphery. The method of claim 14, A flow device, characterized in that a cover is formed in a cylindrical shape.