DE102011006856A1 - Domestic refrigerator with refrigerant piping - Google Patents

Abstract

The invention relates to a household refrigerating appliance (1) comprising at least one heat-insulating inner container (3) with a coolable inner space (4, 5), and a refrigerant circulation system (17) designed to cool the inner space (4, 5), comprising at least one compressor (8 ), a condenser (19), and an evaporator (6, 12), which are connected to form the refrigerant circuit system (17) by refrigerant pipes (20.1-20.8), of which at least two refrigerant pipes (20.1-20.8) each have a feed pipe end portion ( 20a, 20b) and of which a further refrigerant pipe (20.1-20.8) has a drain pipe end portion (20c) into which the two Zulaufrohrleitungsendabschnitte (20a, 20b) open, at least one of the two Zulaufrohrleitungsendabschnitte (20a, 20b) in the flow cross-section having flared pipe section (30).

Description

The invention relates to a household refrigerating appliance, comprising at least one heat-insulating inner container with a coolable interior, and designed for cooling the interior refrigerant cycle system comprising at least a compressor, a condenser, and an evaporator, which are connected to form the refrigerant circuit system by refrigerant pipelines, of which at least two refrigerant pipes each have a feed pipe end portion and of which a further refrigerant pipe has a drain pipe end portion into which the two inlet pipe end portions open.

From the DE 197 56 861 A1 a refrigeration device with a refrigerant circuit system and a heat-insulating housing is known, within which at least two thermally separated cold compartments of different temperature are arranged, each of which is cooled by a corresponding cooling capacity evaporator, wherein serving to cool the compartments evaporators together in a refrigeration cycle arranged in series with one another and are supplied with refrigerant by a compressor located in the refrigeration circuit, wherein at least two injection points are provided on the evaporator to produce the lower temperature, each of which is preceded by a throttling device with a different flow resistance and each of which is controlled by a deflection ,

The object of the invention is to provide a household refrigerator with an improved refrigerant cycle system.

The object is achieved by a household refrigerator, comprising at least one heat-insulating inner container with a coolable interior, and designed for cooling the interior refrigerant cycle system comprising at least a compressor, a condenser, and an evaporator, which are connected to form the refrigerant circuit system by refrigerant pipelines of which at least two refrigerant pipes each have a Zulaufrohrleitungsendabschnitt and of which a further refrigerant pipe has a Ablaufrohrleitungsendabschnitt into which the two Zulaufrohrleitungsendabschnitte open, wherein at least one of the two Zulaufrohrleitungsendabschnitte has a widening in flow cross section pipe section.

A refrigerant cycle system generally includes at least one compressor, at least one condenser, and at least one evaporator. The refrigerant is first compressed by the compressor, which heats the refrigerant. The compressed, heated refrigerant is cooled in the condenser, wherein it can at least partially pass from a gaseous phase into a liquid phase. The liquefied, cooled refrigerant is then supplied to a throttle, which expands the liquefied, cooled refrigerant into an evaporator. By the compressed refrigerant is expanded, it cools down, whereby the evaporator and evaporator plates coupled to the evaporator plates, evaporator fins are strongly cooled. The evaporator or the evaporator plates or evaporator plates are coupled to at least one coolable interior, so that this interior is cooled. The interior forms a cold room and is used for example for frost-free cooling of refrigerated goods, preferably at temperatures between plus 4 and plus 8 degrees Celsius. However, the refrigerator can also be designed as a zero-degree compartment, in particular for keeping fresh fruits or vegetables. Alternatively, the interior may form a freezer compartment which generally serves to freeze frozen food at about minus 18 degrees Celsius. The household refrigerator may have at least one freezer compartment and at least one cold room.

The freezer compartment and the refrigerator can each be assigned its own evaporator. These at least two evaporators may constitute components of a single refrigerant cycle system, in particular a single compressor refrigerant cycle system. The components of the refrigerant cycle system, in particular compressors, evaporators, condenser and throttles and / or expansion valves are generally connected by refrigerant pipelines. Depending on how the components in the refrigerant cycle system are interconnected, one or more branches in the refrigerant cycle system may be necessary. A branch can also be designed as an inlet, in which, for example, two or more inlet pipe end sections open into a common outlet pipe end section. Such a pipe branch or pipe junction can be designed, for example, T-shaped or Y-shaped.

Occasionally there is the requirement that refrigerant is supplied via a capillary tube in a refrigerant pipe, in particular to be injected. Capillary tubes can form chokes in refrigerant cycle systems. Capillary tubes are known and commonly used in household refrigeration appliances. Capillary tubes are characterized by a reduced, in particular greatly reduced, flow cross-section compared to the other refrigerant pipelines.

Now, if refrigerant from a particular thin capillary tube is introduced or injected into a refrigerant pipe with in particular significantly larger flow cross-section, then the refrigerant expands into the refrigerant pipe, which may lead to unwanted frost spots or undesirable noise developments in the region of the discharge point.

By having at least two refrigerant pipes, each having a Zulaufrohrleitungsendabschnitt and of which a further refrigerant pipe has a Ablaufrohrleitungsendabschnitt into which the two Zulaufrohrleitungsendabschnitte open, at least one of the two Zulaufrohrleitungsendabschnitte has a widening in flow cross-section pipe section, the refrigerant gradually relaxes along the pipe section, so that, for example, a high pressure of the refrigerant is reduced more slowly, or more gradually. By a gradual pressure reduction unwanted frost or unwanted noise developments can be completely avoided or at least reduced.

The inflow pipe end section may have a flow cross-sectional course extending between the pipe section widening in the flow cross-section and an outlet-side front end of the inflow pipe end section or a pipe connecting sleeve, a constriction-free, in particular constant or even increasing flow profile. The feed pipe can, for example, have a flow cross-section or inside diameter that is constant over its longitudinal course. In the vicinity of the feed pipe end section, this constant flow cross section or inner diameter can expand to a larger flow cross section or inner diameter. In the simplest case, this extension can occur at a discrete point, so to speak, suddenly, or gradually over a distance.

In all embodiments, therefore, the pipe section widening in the flow cross-section can be continuous, in particular conically widening.

At the pipe section that widens in the flow cross section, a pipe section with a constriction-free, in particular constant or even increasing flow cross-sectional profile can follow, in particular before an exit-side front end of the inlet pipe end section is reached. At the constant small, in particular capillary flow cross-section can thus join a pipe section with a cross-sectional widening and the pipe section with a cross-sectional widening can then connect another pipe section with a particular constant enlarged flow cross-section before this pipe assembly opens into the discharge pipe end portion. The pipe section with a constant small, in particular capillary flow cross-section, the pipe section with the cross-sectional widening and the pipe section with the particularly constant enlarged flow cross section can be formed by forming on a one-piece inlet pipe end section, or be composed of individual separate pipe sections, for example by soldering. In such a pipe arrangement, however, flow cross-section reductions, in particular constrictions in the flow direction of the refrigerant, should at least substantially be avoided, if not completely excluded.

The pipe section widening in the flow cross-section can be made widening up to a constant outflow cross-section, in particular an outflow cross-section corresponding to the outflow cross-section of the other inlet pipe end section. For example, in the case of two feed pipe end sections, the two feed pipe end sections can have the same or at least approximately the same flow cross section at their respective front ends.

In all embodiments, the pipe section widening in the flow cross section can have a circular flow cross section. Alternatively or additionally, a hollow-cylindrical, in particular hollow circular-cylindrical end pipe section can adjoin the pipe section widening in the flow cross-section. All tube sections may have both a circular inner wall cross-section and a circular outer wall cross-section to form an at least approximately equal wall thickness.

The pipe section widening in the flow cross-section can be formed, for example, on a separate pipe connection sleeve, which is attached to the inlet pipe end section, in particular soldered. In other words, this may mean that an intermediate pipe piece is inserted between the actual feed pipe end portion and the drain pipe end portion. The intermediate pipe section may have the pipe section widening in the flow cross section and / or the hollow cylindrical, in particular hollow circular cylindrical end pipe section having a constant flow cross section.

In all embodiments, the pipe section widening in the flow cross-section can be aligned coaxially with the feed pipe end section. This means that the refrigerant is at least substantially the same, in particular as possible large distance from the inner walls of the widening in the flow cross-section pipe section end face of the particular capillary Zulaufrohrleitungsendabschnitt exits.

The inlet pipe end section can be formed, for example, by a capillary, which is adjoined by the pipe section widening in the flow cross section, in particular to which capillary a tube section of a pipe connection sleeve can be connected, which has the pipe section widening in the flow cross section. The tube section can aufeisen a uniform inner diameter, which is substantially equal to or only slightly larger than the outer diameter of the capillary. Thus, an end portion of the capillary can be prefixed by simply inserting it into the tube section on the tube coupling sleeve. By such prefixing the capillary can be easily connected to the pipe connection sleeve, in particular soldered or glued. In particular, during installation, the depth can also be set by which the capillary should project into the pipe connection sleeve, in particular into the pipe section widening in the flow cross section.

The capillary can thus protrude within the pipe connection sleeve into the conically widening pipe section. In this embodiment, the capillary of the inner wall diameter thus does not proceed continuously into the pipe section widening in the flow cross-section at the outlet end side, but has a jump. Depending on how far extends the capillary within the pipe connection sleeve into the flared pipe section, different flow conditions can be adjusted. Thus, the flow conditions during assembly of household refrigerators can be optimally adjusted or adjusted.

In all embodiments, the two Zulaufrohrleitungsendabschnitte can be used parallel to each other in the drain pipe end portion. As a result, refrigerant enters the downcomer end portion from at least approximately the same direction. In addition, a flow deflection from the Zulaufrohrleitungsendabschnitten is reduced to the drain pipe end portion to a minimum.

The downcomer end portion may be axially aligned in a direction parallel to the axial extent of the downcomer end portions. As a result, refrigerant enters the downcomer end portion from at least approximately the same direction. In addition, a flow deflection from the Zulaufrohrleitungsendabschnitten is reduced to the drain pipe end portion to a minimum.

The drain pipe end section may have a particularly constant flow cross-section, which is at least not substantially reduced, in particular equal to or even greater, than the sum of the individual flow outlet cross-sections of the inlet pipe end sections. As a result, it can be achieved that no large, in particular sudden, pressure changes occur in the transitional region from the inlet conduit end sections into the downcomer end section.

In summary, the invention, sometimes in other words, a refrigerant cycle system of a household refrigeration appliance can be improved in particular with regard to injection and flow noise. The refrigeration cycle system according to the invention can be used in particular for cooling of freezer rooms and in refrigerated / freezer combination appliances. In particular, in these devices, a capillary tube can open into a coming of a refrigeration compartment tube immediately before the freezer. The refrigerant cycle system can be connected so that refrigerant is injected either in the refrigerator compartment with downstream freezer or directly into the freezer.

In one embodiment of an injection configuration according to the invention, a tube enclosing the capillary in the course of the capillary tube, which then widens conically, can be inserted into a specially shaped Y-piece into which the connecting tube can then open. The capillary tube can be located centrally in the injection tube. The flow cross sections are not reduced in advantageous embodiments by the Y-piece and also the flow direction is not significantly deflected.

Also in the connecting pipe, the flow cross sections in the course in the flow direction can not be significantly reduced. As a result, sometimes homogeneous flow conditions can be achieved and consequently flow noise can be reduced.

In one embodiment, the capillary tube may be arranged centrally in the middle of the tube, so that the injection of the refrigerant does not take place in the vicinity of the inner wall of the injection tube, which could, for example, lead to negative detachment effects, which could be associated with noise. Furthermore, in a cylindrical gap between capillary tube and injection tube, the penetration depth of a solder and / or the position of the capillary can be better adjusted and made stable in terms of manufacturing technology.

Further features and advantages of the household refrigerating appliance according to the invention may be apparent from the following description of an exemplary embodiment with reference to the accompanying figures. Concrete features of this embodiment may represent general features of the invention.

Show it:

1 a perspective view of an exemplary household refrigerator with a refrigerant cycle system;

2 a schematic representation of a refrigerant circuit system according to the invention with refrigerant pipelines;

3 a perspective view of an inner container of the exemplary household refrigerator with a Y-shaped convergence in the refrigerant cycle system;

4a a perspective view of the Y-shaped convergence with a type of pipe connection sleeve;

4b a cross-sectional view of a capillary Zulaufrohrleitungsendabschnitts which is connected to the pipe connection sleeve.

An in 1 exemplified household refrigeration appliance 1 has a body 2 with an inner container 3 on. The inner container 3 is in an overhead freezer 4 and a downstairs refrigerator 5 divided up. The freezer room 4 Generally used for freezing frozen food at about minus 18 degrees Celsius. The freezer room 4 is a first evaporator 6 assigned behind a freezer compartment rear wall 7 is arranged. The freezer room 4 is when the freezer compartment door is open 9 accessible. To open, the freezer compartment door points 9 a first grip 10 on.

The fridge 5 is generally used for frost-free cooling of refrigerated goods, preferably at temperatures between plus 4 and plus 8 degrees Celsius. The fridge 5 However, it can also be designed as a zero degree compartment, in particular for keeping fruit or vegetables fresh. The fridge 5 has a back wall 11 on, behind the first evaporator 6 for the freezer room 4 is arranged. A second evaporator 12 serves to cool the refrigerator 5 , The fridge 5 is when the fridge door is open 14 accessible. To open, the refrigerator door points 14 a second grip 15 on.

A single evaporator, or the first evaporator 6 and the second evaporator 12 , or any number of evaporators can be connected to a compressor 8th be connected. The compressor 8th is from the back, ie behind the back wall 11 of the refrigeration device 1 in a machine room 13 of the housing 16 used.

In the 2 is an exemplary embodiment of a refrigerant cycle system 17 shown schematically. The refrigerant cycle system 17 has a compressor 8th , a liquefier 19 , as well as a first evaporator 6 and a second evaporator 12 on. Every evaporator 6 . 12 may be a first unregulated expansion valve 18 , for example as a throttle 18a and a second uncontrolled expansion valve 18 for example, as a throttle 18b be vortexed upstream. The compressor 8th , the liquefier 19 , the evaporator 6 . 12 and the throttles 18a . 18b are about refrigerant piping 20 fluidically, as in 2 illustrated, interconnected.

After that from the compressor 8th compressed and then from the condenser 19 Cooled and liquefied refrigerant from the condenser 19 outlet, the refrigerant in the illustrated embodiment via a refrigerant pipe 20.2 a switching device 21 fed. About the switching device 21 The refrigerant is either via a refrigerant pipe 20.3 and a throttle 18a the first evaporator 6 supplied or via another refrigerant pipe 20.4 and a second throttle 18b the second evaporator 12 fed.

The first evaporator 6 For example, to the refrigerator 5 and the second evaporator 12 to the freezer room 4 be coupled refrigeration technology. In a first mode of operation in which the refrigerant through the switching device 21 via the refrigerant pipe 20.3 and over the throttle 18a the first evaporator 6 is fed, the refrigerator is first 5 and connected in series, via the refrigerant piping 20.6 the second evaporator 12 fed to the freezer compartment 4 refrigeration technology is coupled. So first, the refrigerator 5 and then the freezer compartment 4 cooled by the refrigerant. In a second operating mode, only the freezer compartment becomes 4 and not the fridge 5 cooled. In this second mode of operation, in which the refrigerant through the switching device 21 via the refrigerant pipe 20.4 and over the throttle 18b directly, ie bypassing the first evaporator 6 the second evaporator 12 is supplied, the refrigerant through the refrigerant pipe 20.05 the second evaporator 12 fed.

To the household refrigerator 1 Optionally operate in one of the two operating modes, the refrigerant piping 20.05 and 20.6 a common refrigerant pipe 20.7 fed.

The refrigerant piping 20.6 has in the exemplary embodiment a Zulaufrohrleitungsendabschnitt 20a and the refrigerant piping 20.05 an inlet pipe end section 20b on. The two inlet pipe end sections 20a and 20b open into a drain pipe end section 20c the refrigerant piping 20.7 ,

In the 3 are the inlet pipe end sections 20a . 20b and the downcomer end section 20c shown enlarged. The 3 shows a perspective section of the inner container 3 with the coolable interior, ie the freezer compartment 4 and the fridge 5 , The inlet pipe end section 20b is in the illustrated embodiment as a capillary 22 executed.

In the 4a and 4b is exemplified in more detail how the Zulaufrohrleitungsendabschnitt 20b a pipe section widening in the flow cross-section 30 having. The inlet pipe end section 20b is in the embodiment of a capillary 22 formed, to which the widening in the flow cross-section pipe section 30 followed. The pipe section 30 can be part of a pipe connection sleeve 31 its a tube section 32 having. As in 4b shown in cross-section, is the capillary 22 into the tube section 32 inserted and connected to this. The tube section 32 then in turn opens into the pipe section widening in the flow cross-section 30 one.

The pipe section widening in the flow cross-section 30 expands steadily in the embodiment. The pipe section widening in the flow cross-section 30 is also formed conically widening.

As in particular in 4a illustrated, the Zulaufrohrleitungsendabschnitt 20b between the pipe section widening in the flow cross-section 30 and an exit-side front end 33 of the inlet pipe end section 20b , an end pipe section 34 having constriction-free, in particular constant or even increasing flow cross-sectional profile.

The pipe section widening in the flow cross-section 30 is up to a constant outflow cross section of the end pipe section 34 widening trained. The outflow cross section of the end pipe section 34 can thereby a the Ausströmquerschnitt the other Zulaufrohrleitungsendabschnitts 20a have corresponding outflow cross-section.

In the illustrated embodiment, the extending in the flow cross-section pipe section 30 a circular flow cross-section. At the expanding in the flow cross section pipe section 30 closes in accordance with a hollow cylindrical end pipe section 34 at. The pipe section widening in the flow cross-section 30 is on the separate pipe connection sleeve 31 educated. The pipe connection sleeve 31 is at the feed pipe end section 20b or at the capillary 22 attached, in particular soldered.

Like in the 4b is shown in the flow cross-section widening pipe section 30 coaxial with the feed pipe end section 20b or to the capillary 22 is aligned. The capillary 22 protrudes inside the pipe connection sleeve 31 into the conically widening pipe section 30 into it. The two inlet pipe end sections 20a and 20b are parallel to one another in the downcomer end section 20c used. The drain pipe end section 20c is in one of the axial extent of Zulaufrohrleitungsendabschnitte 20a and 20b arranged parallel to the axial direction.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 19756861 A1 [0002]

Claims (12)

Domestic refrigerating appliance, comprising at least one heat-insulating inner container ( 3 ) with a coolable interior ( 4 . 5 ), and one for cooling the interior ( 4 . 5 ) formed refrigerant circuit system ( 17 ), the at least one compressor ( 8th ), a liquefier ( 19 ), and an evaporator ( 6 . 12 ) used to form the refrigerant cycle system ( 17 ) through refrigerant pipelines ( 20.1 - 20.8 ), of which at least two refrigerant pipelines ( 20.1 - 20.8 ) each have a feed pipe end section ( 20a . 20b ) and of which another refrigerant pipeline ( 20.1 - 20.8 ) a drain pipe end portion ( 20c ) into which the two feed pipe end sections ( 20a . 20b ), characterized in that at least one of the two Zulaufrohrleitungsendabschnitte ( 20a . 20b ) has a pipe section which widens in the flow cross-section ( 30 ) having. Domestic refrigerating appliance according to claim 1, characterized in that the feed pipe end section ( 20a . 20b ) between the pipe section widening in the flow cross-section ( 30 ) and an exit-side front end ( 33 ) of the feed pipe end section ( 20a . 20b ) or a pipe connection sleeve ( 31 ), a constriction-free, in particular constant or even increasing flow cross-sectional profile. Domestic refrigerating appliance according to claim 1 or 2, characterized in that in the flow cross-section widening pipe section ( 30 ) is formed continuously, in particular conically widening. Domestic refrigerating appliance according to one of claims 1 to 3, characterized in that extending in the flow cross section pipe section ( 30 ) up to a constant outflow cross-section, in particular a the Ausströmquerschnitt the other Zulaufrohrleitungsendabschnitts ( 20a . 20b ) corresponding Ausströmquerschnitt is widening. Domestic refrigerating appliance according to one of claims 1 to 5, characterized in that extending in the flow cross section pipe section ( 30 ) has a circular flow cross-section, and / or at the widening in the flow cross section pipe section ( 30 ) a hollow cylindrical, in particular hollow circular cylindrical end pipe section ( 34 ). Domestic refrigerating appliance according to one of claims 1 to 5, characterized in that extending in the flow cross section pipe section ( 30 ) on a separate pipe connection sleeve ( 31 ) formed at the feed pipe end portion ( 20a . 20b ), in particular soldered. Domestic refrigerating appliance according to one of claims 1 to 6, characterized in that extending in the flow cross section pipe section ( 30 ) coaxial with the feed pipe end section ( 20a . 20b ) is aligned. Domestic refrigerating appliance according to one of claims 1 to 7, characterized in that the feed pipe end portion ( 20a . 20b ) from a capillary ( 22 ) is formed, to which the expanding in the flow cross-section pipe section ( 30 ), in particular with which capillary ( 22 ) a tube section ( 32 ) a pipe connection sleeve ( 31 ) is connected, which the expanding in the flow cross section pipe section ( 30 ) having. Domestic refrigerating appliance according to claim 8, characterized in that the capillary ( 22 ) within the pipe connection sleeve ( 31 ) into the conically widening pipe section ( 30 ) protrudes. Domestic refrigerating appliance according to one of claims 1 to 9, characterized in that the two inlet pipe end sections ( 20a . 20b ) parallel to each other in the downcomer end portion ( 20c ) are used. Domestic refrigerating appliance according to one of claims 1 to 10, characterized in that the downcomer end section ( 20c ) in an axial extension of the Zulaufrohrleitungsendabschnitte ( 20a . 20b ) is arranged axially aligned parallel direction. Domestic refrigerating appliance according to one of claims 1 to 11, characterized in that the downcomer end section ( 20c ) has a particularly constant flow cross-section, which in comparison with the sum of the individual flow outlet cross-sections of the feed pipe end sections ( 20a . 20b ) is at least not substantially reduced, in particular the same or even larger.

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