ES2211922T3 - EVAPORATOR PROVISION FOR DOMESTIC REFRIGERATORS. - Google Patents

Abstract

THE INVENTION REFERS TO AN EVAPORATOR PROVISION FOR DOMESTIC REFRIGERATION DEVICE WITH AT LEAST TWO EVAPORATORS (21,25) THAT ARE AVAILABLE IN A REFRIGERATING CIRCUIT CLOSED WITH A REFRIGERANT CONDENSER (20), SHOWING DIFFERENT POWERS REFRIGERATION MEDIA CHANNEL PROVISIONS JOIN ONE WITH ANOTHER CURRENT TECHNICAL FORM IN A SERIAL CONNECTION, WHERE THE EVALUATION CHANNEL-MEDIUM REFRIGERATION PROVISION SHOWS A REDUCED COOLING POWER (25) WITH A MANIFOLD (28) THE LIQUID REFRIGERANT MEDIA, CONNECTING THE HIGH POWER COOLING EVAPORATOR (21) OF CURRENT TECHNICAL FORM AND THE COOLING MEDIA OPERATED IN THE CURRENT ADDRESS OF THE EVAPORATOR (20) IS CONFIGURED FROM THE STRETCH IN THE COLLECTOR ( 28) OPTIMIZED VOLUME FORM WITH REGARD TO YOUR REFRIGERATION CHANNEL PROVISION.

Description

Evaporator arrangement for refrigerators domestic.

The invention relates to an evaporator system for household refrigerators with at least two evaporators located in a refrigerator with a refrigerating agent compressor, that present different cooling capacity, whose systems of chilling agent channels are fluidly linked to each other connected in series, having the agent channel system evaporator cooler of lower refrigerant power a collector for liquid refrigerating agent.

From DE-GM 90 06 386 patent knows a two-temperature refrigeration device, which to cool its compartments thermally separated from each other is equipped With a plate evaporator. It has two evaporator sections Fluidically arranged in series, equipped with different power refrigerator, which are mechanically linked to each other by means of a junction bridge and that can be fed with refrigerating agent to through an injection point located on the evaporator section of lower cooling capacity. For this the plate evaporator It is designed in such a way that the refrigerating agent passes from the injection point through a refrigerating agent channel laying meandering, first through the evaporator section of lower cooling capacity, and then drive to the section of the evaporator of greater cooling power, and from this one it becomes to lead back to the lower power evaporator section refrigerating For its phase separation, it leads here to a bag-shaped collector, which in the direction of flow of the agent refrigerator is connected before a pipe connection aspiration.

Due to the refrigeration circuit of the two sections of the evaporator, according to which the section of the largest evaporator cooling capacity is fluidly arranged following the section of the evaporator of lower cooling capacity, it turns out that this last is the first one that is fed with refrigerating agent liquid and therefore cooled, and only then is the section of the evaporator with the greatest cooling capacity. This in turn supposes that after a certain time of operation of the refrigerating agent compressor passes liquid refrigerating agent from the evaporator section with the highest cooling capacity connected to the lower power evaporator section but it can't evaporate there because it has already been cooling of this section of the evaporator, and then It is deposited in the collector. But due to its geometric shape this one can only accept a certain amount of refrigerating agent liquid, so there is a danger that it can reach the suction tube, and depending on the circumstances even the compressor, damaging this one. To prevent this it is essential to reduce the Filling agent filling volume in the refrigeration circuit, so that manifestations of lack of filling and therefore power losses in the circuit Fridge.

From US-PS 3,009,338 it is Meet a refrigeration circuit with two different evaporators cooling capacity, of which the evaporator of lower power refrigerator has a collector located next to its chiller system, in the flow direction of the refrigerating agent driven by a compressor, as well as a Temperature sensor for compressor activation.

US Pat. No. 2,769,319 shows and describes a refrigeration circuit with two evaporators Different cooling capacity. The amount of refrigerating agent of the refrigeration circuit is controlled by means of the capacity of oil reception in the circuit Fridge.

The invention aims to improve a evaporator system in relation to the inconvenience of the state of technique

In accordance with the invention this is resolved objective by claim 1.

The solution object of the invention is characterized mainly because the amount of refrigerating agent needed for operation with optimized power of the device Fridge is insensitive to quantity tolerances, so that the refrigeration circuit can work without appreciable loss of power even if there are significant variations in the filling quantity Through the evaporator system object of the invention is further prevented during the operation of the compressor can pass liquid refrigerating agent to the tube aspiration, where it can lead to the formation of noises and on the other to the cooling and therefore to the formation of condensation water, from which problems of corrosion in the suction tube. It is also obtained for the higher power evaporated compartment refrigerator a storage temperature that is maintained clearly more accurately if a regulation is used indirect temperature of the coldest compartment through the warmer compartment, as usual in this kind of single circuit refrigeration systems.

Volume optimization should be understood here the realization of the section of the channels of refrigerating agent which can be mastered by manufacturing techniques, or its maximized arrangement in terms of length over a given evaporator stage surface.

According to a preferred embodiment of the object of the invention it is provided that the optimization of the volume of the refrigerating agent channel system section of the evaporator with lower cooling capacity, located before collector, is achieved by the length of the agent channels refrigerator that form the agent channel system Fridge.

By this embodiment of the smaller evaporator cooling capacity is created in this one in a very simple way a volume of additional capacity of liquid refrigerating agent, with which also prevents that during the operation of the compressor liquid refrigerant can pass to the suction tube of the cooling circuit, cooling it inadmissibly, even if this refrigeration circuit is full of refrigerating agent until the top fill level.

According to another embodiment preferred of the object of the invention is provided that the return of refrigerating agent from the evaporator of lower cooling capacity next to the compressor suction side is thermally disengaged of the evaporator of greater cooling power, at least in its greater part.

Through this solution it is guaranteed that the evaporator of greater cooling power and therefore the compartment cooled by this one does not heat unnecessarily due to the relatively hot refrigerating agent steam from the evaporator of lower cooling capacity and, therefore so much so that additional energy is needed to re-establish the desired temperature

According to a last embodiment preferred object of the invention is provided that evaporators of different cooling capacity are made as autonomous construction units, only fluidly connected each other, where the evaporator with the lowest cooling capacity is arranged in the upper position within the provision of installation of the evaporator system, and the entrance of your system of refrigerating agent channels is lower than its exit.

Through this arrangement of the system evaporators are guaranteed that the liquid refrigerating agent may pass, during the stopping of the refrigerating agent compressor, from the evaporator of lower cooling power to the evaporator of greater cooling capacity, since, conditioned by the design, no cooling agent channel systems in the form of siphon in the evaporator of lower cooling power, so that On the one hand, clocking noises caused by ascending vapor bubbles that pass through liquid waste of refrigerating agent, and on the other hand the called subsequent evaporation of liquid agent residues refrigerator in the evaporator, so that it can be defrost more objectively and therefore faster during the stopping of the refrigerating agent compressor.

The invention is explained in the description. following using an exemplary embodiment depicted of Simplified form in the attached drawing. It shows:

Fig. 1 a domestic refrigerator to build with two compartments arranged one above the other, presenting different storage temperature, which are cooled every one by an evaporator, seen laterally and represented in section, Y

Fig. 2 schematically, the evaporators intended to cool the compartments at your disposal of the refrigeration circuit

A domestic refrigerator 10 represented in Fig. 1 it has a heated housing 12 that can be closed through a door 11, inside which two are arranged different temperature compartments, thermally separated each other by means of a heat-separated separation plate 13. The compartment above the separation plate 13 is made as normal refrigerator compartment 14, with shelves Intermediates 15 intended for product placement, while the compartment under the separation plate 13 serves as a cold storage compartment 16. This one is provided with several containers 17 arranged one above the other, with walls closed, partly formed as removable drawers, where container walls facing the inner sides of the compartment serve together with these as conductive systems of the cooling air recirculated inside the compartment cold storage 16 using a fan that is not represented. Cold storage compartment 16, presents on its rear face a projection as a step 18, by means of the which forms a niche accessible from the heated housing 12 the exterior 19 to house the refrigerating agent compressor 20. This serves for the forced recirculation of refrigerating agent in a closed circuit, with two plate-shaped evaporators that present different cooling capacity, made as the called Coldwall evaporators. Of these, the largest evaporator cooling capacity 21 is located in the compartment of cold storage 16, and is provided with an injection point of refrigerant 22, which serves to lower the pressure of the agent refrigerator flowing to evaporator 21 from a blender located in the refrigeration circuit, which is not represented. The evaporator of greater cooling capacity 21 is provided with an agent channel refrigerator arranged in meanders on the evaporator stage serving as a chiller agent channel system 23, whose output end, in the system installation arrangement evaporator in the refrigerating apparatus 10, is located at a higher height of the injection point of refrigerating agent 22, and is connected to a refrigerating agent pipe 24. This is used for fluidic connection of the evaporator with the greatest cooling capacity 21 al 25 evaporator, in the form of a stage, with lower power refrigerator, located in the normal refrigeration compartment 14 and that it is connected with the evaporator 21 only through the refrigerating agent pipe 24. The evaporator of lower power refrigerator 25 is provided with a refrigerating agent channel that it serves as a cooling agent channel system 26, which by its side attached to the refrigerating agent pipe 24 has a entrance hole 27, and is arranged in near meanders between yes along the entire height of the evaporator stage. The end of the outlet side of the refrigerating agent channel is provided with a collector of refrigerating agent 28, in the form of a sack and which has a horizontal connection pipe, before flow into an outlet opening 29 arranged at a higher height in the installation arrangement of evaporator 25, and which serves to connect to a suction pipe in the cooling circuit That is not represented. Through the physical separation between suction pipe and refrigerant agent injection point 22 a return pipe to the injection point 22 is avoided, which would contribute to an unnecessary heating of the evaporator 21, of so that the two evaporators 21 and 25 are largely thermally decoupled from each other.

When the refrigerating agent compressor 20 is is in normal regime, the liquid refrigerant driven by this is first conducted to the evaporator of greater power refrigerator 21, first arranged in the serial connection of the two evaporators 21 and 25, so that it cools first place. Then the liquid refrigerating agent is conducted to the evaporator of lower cooling capacity 25, arranged in second place in the series circuit, so that it cools. On going increasing the operating time of the agent compressor refrigerator 20 increases the amount of liquid refrigerating agent by the evaporator of lower cooling capacity 25, whereby the excess refrigerant slowly builds up throughout of the time in the collector of refrigerating agent 28, whereby and in combined with the volume optimization of the system section of channels of refrigerating agent 26, achieved by means of flow directions of the refrigerating agent, before the collector of refrigerating agent 28, due to the large length of the channels, prevents liquid refrigerating agent from passing the tube suction that has been heated by the steam of refrigerating agent aspirate. After disconnecting the refrigerant compressor 20, the evaporator with the lowest cooling capacity 25, used to cool the normal cooling compartment 14, it is heated from way considerably faster than the larger evaporator cooling capacity 21 located in the compartment of cold storage 16, whereby the liquid refrigerating agent accumulated in the collector of refrigerating agent 28 evaporates very quickly and partially condenses on the largest evaporator cooling capacity 21. The refrigerating agent found in the evaporator agent channel system 26 of the evaporator 25 after disconnecting the refrigerating agent compressor 20 is driven by the effect of the force of gravity on the agent refrigerator, to the evaporator of greater refrigeration power arranged below, in the installation arrangement of the system evaporators.

It is understood that the invention is also applicable to an evaporator stage in which a section of evaporator of greater cooling power be communicated through of a junction bridge with a lower power evaporator section refrigerant, in which case the return of the refrigerating agent from the evaporator section with lower cooling capacity no it is carried out through the section of the evaporator of greater power refrigerating

Claims (4)

1. Evaporator system for domestic refrigerating appliances, with two storage compartments of different temperatures, with at least two evaporators located in a closed refrigeration circuit with a refrigerating agent compressor controlled by means of the temperature of the hottest storage compartment, and which have different cooling capacity, whose refrigerating agent channel systems are fluidly connected to each other in series, with the evaporator cooling system system having a lower cooling capacity of a collector, which has a horizontal connecting pipe and extending in the form of a bag downwards, from the connection pipe for liquid refrigerating agent, the evaporator of lower refrigerating power being fluidly connected following the evaporator of greater cooling power, characterized in that the section of its system of channels of refrigerating agent (26) located before the manifold (28), in the direction of flow of the refrigerating agent driven by the compressor (20), is performed with volume optimization, whereby the amount of refrigerating agent loaded in the refrigeration circuit is insensitive to Quantity tolerances. 2. Evaporator system according to claim 1, characterized in that the optimization of the volume of the section of the refrigerating agent channel system (26) of the evaporator of lower refrigerating power (21) located before the manifold (28), is achieved by the length of the refrigerating agent channels that form the refrigerating agent channel system. 3. Evaporator system according to claim 1 or 2, characterized in that the return of the refrigerating agent from the evaporator of lower cooling capacity (21) on the suction side of the compressor (20) is thermally disengaged, at least to a large extent, from the evaporator of greater cooling power (21). 4. Evaporator system according to claim 1 or 2, characterized in that the evaporators of different refrigerating power (21, 25) are made as autonomous units, simply fluidly connected to each other, the evaporator having the lowest cooling power (25) being located in the part upper, in the installation arrangement of the evaporator system, and the inlet (27) of its refrigerating agent channel system (26) is located lower than its outlet (29).