ES2334117T3 - REFRIGERATOR EQUIPMENT WITH TWO EVAPORATORS. - Google Patents

Abstract

The invention relates to a refrigerating appliance comprising a refrigerant circuit in which a compressor (9) and two evaporators (5, 6) are connected in series and crossed by a refrigerant. The quantity of refrigerant circulating in the refrigerant circuit is measured in such a way that the refrigerant essentially fully evaporates in the evaporator (5) which is arranged further upstream in the refrigerant circuit.

Description

Refrigerator equipment with two evaporators.

The present invention relates to equipment refrigerators in accordance with the preamble of claim one, as known, for example, of the document DE-A-195 35 144 or DE-A-195 35 145.

The equipment cooling agent circuits Conventional refrigerators of this type feature a collector in which can accumulate cooling agent in the course of a interruption of the operation of the compressor, which after the resumption of compressor operation can be supplied immediately. When the compressor of a team Conventional refrigerator of this type is put into operation, a certain time elapses until the cooling agent liquid reaches the evaporator and begin to cool a compartment assigned to said evaporator. Although during this period it is consumed electric power for compressor operation, I don't know achieves a usable cooling effect.

The objective of the present invention is to create a refrigerator equipment of the type indicated at the beginning, in which a cooling effect can be achieved immediately by putting in starts the compressor and that, in this way, presents a performance improved thermal

This objective is achieved through the characteristics of claim 1.

This means that the cooling performance of the second evaporator run, located downstream is, in the better, a small fraction of the performance refrigerant that would be achieved if it were traveled being the First. By said dosage of the cooling agent is possible to use the downstream evaporator as agent collector refrigerant. Consequence of this is, that by putting in operation the compressor is produced, by sucking the evaporator cooling agent with collector function, a evaporation of cooling agent in said evaporator and, thereby, immediate cooling

The evaporators are arranged, preferably, at different levels, the evaporator being upstream set higher than the water evaporator down.

The evaporator coolant pipe located upstream is preferably steep in shape continues most of its length towards the evaporator located downstream. Thus, before a circuit stop of the cooling agent can flow freely in this agent pipe refrigerant in evaporator condensation process ready downstream. In order to operate both evaporators separately each other, in the cooling agent circuit is arranged, preferably, a distribution valve that allows decoupling from the cooling agent circuit the evaporator arranged waters above.

Other features and advantages of the invention result from the following description of a manufacturing model, by the attached figures. They show:

Figure 1, a schematic section through of a refrigerating equipment to which this can be applied invention;

Figure 2, a schematic representation of a cooling agent circuit for the cooling equipment of figure 1; Y

Figure 3, a detailed representation of the cooling agent circuit.

In figure 1 it is shown in schematic form a section through a refrigerator with a housing 1, which features two interior compartments 3, 4 separated by a intermediate bottom 2, for example, a freezer and a compartment of normal cooling, on whose back walls, in each case opposite the doors 7, 8 are mounted evaporators 5 or 6. The evaporators 5, 6 are fed with a cooling agent by means of a compressor 9 which, depending on the measured temperatures, in each case, in interior compartments 3, 4, it is operated in a intermittent.

Figure 2 shows in schematic form the equipment coolant circuit structure refrigerator of figure 1. In the refrigerant agent circuit, the compressor 9, a heat exchanger 10, the evaporator 5 of the interior compartment 3 located above and the evaporator 6 of the inner compartment 4 located below are connected in series for a closed circuit. The volume of cooling agent circulating in this circuit is sized so that, in refrigerant operation and with the compressor running, the agent refrigerant supplied to evaporator 5 located above is, in the essential, evaporated when the flow of coolant arrives to evaporator 6 located below. Although both evaporators 5, 6 they are connected in series, it is only cooled, essentially, the inner compartment 3 located above.

To also cool the compartment interior 4 located below, with the output of the compressor 10 is connected a distribution valve 11 which, in its first position control leads the flow of cooling agent to the entrance of the evaporator 5 and, in its second control position, suppressing previously the evaporator 5 of the cooling agent circuit, what leads directly to the evaporator inlet 6.

The evaporators 5, 6 are shaped so itself known as a roll-bond evaporator, with a evaporation plate of a good thermal conductor material and in close contact with the cooling agent pipe 12 extended on one side of the plate in alternating directions. The refrigerant agent pipe 12 is steep from inlet 13 until the outlet 14 of the evaporator 5. In this way it is achieved, that the cooling agent, which with the compressor 9 disconnected can to condense in evaporator 5, do not accumulate in it, but rather evacuates to evaporator 6 located below which, in this way, works as a collecting container for the cooling agent. For simplify, the evaporator 6 located below, as the figure, can have the same structure as the evaporator 5 located higher.

When one of the temperature sensors (no shown) arranged in interior compartments 3, 4 indicates the need for cooling of the respective inner compartment and the compressor 9 is started, it sucks agent evaporator refrigerant 6 located below. Pressure drop resulting in it in evaporator 6 produces evaporation in it of cooling agent and thereby cooling the inner compartment 4. Said cooling is performed regardless of whether the need for cooling of the upper inner compartment 3 or of the lower inner compartment 4. In general, it is also desired when there is a need in the upper inner compartment 3 of cooling, because it prolongs the time that must pass until evaporator 6 must be fed again with agent liquid refrigerant to cool the lower compartment 4.

Figure 3 shows a detailed representation or a refinement of the refrigerant agent circuit of the Figure 2. The cooling agent circuit elements already explained by figures 1 and 2 are indicated with them references and not described again. The cooling agent of heat exchanger 10 arrives at the distribution valve 11 a through a dehumidifier 15. Inside a pipe return 18 capillary tubes 16, 17 that form the outlets are conducted of distribution valves 11, whereby the agent decompressed refrigerant is taken to compressor 9 from the outlet of evaporator 6 located below. Both capillary tubes are arranged along the outer edge of the compressor 6; without However, because they lead the cooling agent to high pressure, evaporation does not occur in the capillary tubes significant. This only occurs, when after step a through expansion element 19 or 20 the cooling agent decompressed enters the refrigerant agent pipe 12 of the evaporator 6 or 5.

Both evaporators 5, 6 are equipped with electric heating elements 21, which can be used for defrost and dispose of in internal compartments 3, 4 the condensed air moisture on the surface of evaporators 5, 6 or, in particular in the case of the lower evaporator 6, for counteract the cooling resulting from the evaporation of accumulated cooling agent when starting the compressor, when the temperature to keep in the inner compartment 4 It is, exceptionally, higher than room temperature.

Claims (5)

1. Refrigerating equipment with a compressor (9), an evaporator (5) located upstream and an evaporator (6) located downstream, which are connected in series in a cooling agent circuit and covered by a cooling agent, characterized in that the downstream evaporator (6) is used as a coolant collector, and because the volume of coolant circulating in the coolant circuit is sized so that the coolant evaporates, essentially completely, in the evaporator ( 5) located upstream. 2. Refrigerating equipment according to claim 1, characterized in that the cooling agent circuit does not have a cooling agent collector that differs from the evaporators (5, 6). 3. Refrigerating equipment according to claim 1 or 2, characterized in that the evaporators are arranged at a different height, the evaporator (5) being arranged upstream located higher than the evaporator (6) arranged downstream. 4. Refrigerating equipment according to one of the preceding claims, characterized in that the evaporator (5) disposed upstream has a refrigerant agent pipe (12) steep continuously over most of its length towards the evaporator (6) located waters down. 5. Refrigerating equipment according to one of the preceding claims, characterized in that it has a distribution valve (11) for selectively decoupling the evaporator arranged upstream from the refrigerant circuit.