DE3315391A1 - DEFROSTING DEVICE FOR SEVERAL REFRIGERATION SYSTEMS - Google Patents

Description

Defrosting device for several refrigeration systems

10

15th

The invention relates to a defrosting device for several refrigeration systems according to the preamble of claim 1.

Such a defrosting device is known from DE-OS 28 41 765, in which an additional capacitor in the refrigerant circuit of the refrigeration system is switched on, which is also connected to a heating circuit. By opening and closing valves on both sides of the additional condenser in the heat cycle the heat generated by this is provided / can be fed to the heat cycle. The heat cycle exists from a separate liquid circuit, which is fed to defrosting lines in or on the evaporator via controllable valves so that defrosting of the evaporator as required can be made. The heat cycle, for which an additional condenser is required, is complex.

The object of the present invention is to provide a defrosting device according to the preamble of claim 1 fen, in which one on additional capacitors and separate ones Can do without heat cycles.

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This object is achieved in accordance with the characterizing part of claim 1.

No separate heat cycle is required for defrosting / the refrigeration systems, but rather the function of the heat cycle is taken over by loops of the refrigerant circuits without the refrigerant circuits would have to be interrupted.

Further refinements of the invention are to be found in the following description and the subclaims remove.

The invention is described below using an exemplary embodiment shown in the accompanying figure explained in more detail ..

At derr. are illustrated embodiment two refrigeration systems are provided, each having a refrigerant circuit 1 and 2, each one Evaporators 11 and 21, respectively, a condenser 12 and 22, and a compressor 13 and 23, respectively. The evaporator 11, 21 are provided with additional tubing 14 and 24, respectively. Between the compressor 13 and the condenser 12! a solenoid valve 15 is arranged. Between the compressor 13 and the solenoid valve 15 is one of the tubing 24 of the evaporator 21 leading line with a solenoid valve 26 is provided, while the output of the tubing: 24 is connected via a check valve 27 to the line between the solenoid valve 15 and the capacitor 12.

By closing the solenoid valve 15 and opening the solenoid valve 26, the generated by the compressor and thus existing in the refrigerant heat of the additional tubing 24 of the compressor 21 z ″ to defrost it are fed.

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The refrigerant circuit 2 also has a solenoid valve 25 between its compressor 23 and its Condenser 22, the additional tubing 14 of the evaporator 11 of the refrigerant circuit 1 in turn over a solenoid valve 16 is connected to the high pressure side of the compressor 23, while the tubing 14 is on the outlet side Connected via a check valve 17 to the line between the solenoid valve 25 and the capacitor 22 is. In order to defrost the evaporator 11, this takes place in the compressor 23 heated refrigerant by closing the solenoid valve 25 and opening the solenoid valve 16 of the tubing 14 and thus supplied to the evaporator 11.

If there are other refrigeration systems, for example with a refrigerant circuit 3, an evaporator 31, a condenser 32 and a compressor 33, the evaporator 31 is again with additional tubing 34 provided. The additional tubing 34 can preferably come from the high pressure side of the compressor 23 (also again via a solenoid valve 36 and a check valve 37) by closing the solenoid valve 25 and opening it of the solenoid valve 36 for defrosting the evaporator 31 are fed. The largest available Compressor 23 for defrosting the evaporator of the other refrigerant circuits 1, 3 (with three or more refrigeration systems ) used, while in particular the second largest compressor 13 for defrosting the evaporator 21 in the refrigerant circuit 2, which contains the largest compressor 23, is used.

The check valves 17, 27, 37 prevent refrigerant from shifting during non-defrosting times.

The capacitors 12, 22, 32 can be air-cooled or water-cooled (indicated by a fan blade 40),

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whereby they are controlled via a pressostat 41 - similar to a heat recovery operation.

In the capacitors 12 and 22 a Nachbzw. Residual liquefaction of the respective additional Made contact 14, 24, 34 coming refrigerant will.

In the case of refrigeration units, it is sufficient to use finned tubes or small-area condensers in a single row same height or inflow width of the refrigerator evaporator. There is also an additional touch in the case of refrigerator evaporators an existing drip gutter is required, for example in Shape of a pipe snake.

Claims (5)

Expectations 10 '' 1) 7 defrosting device for several refrigeration systems, each with a refrigerant circuit that has a compressor, has a condenser and an evaporator, the evaporator with the help of lines that- a warm medium lead, are defrostable, characterized in that each evaporator (11, 21, 31) with additional tubing or a small-area condenser (14, 24, 34) is provided, in each case the tubing or the condenser (14, 24, 34) for the evaporator (11, 21, 31) of a refrigerant circuit (1, or 2, or 3) with the high pressure side a compressor (13, 23, 33) of a further refrigerant circuit (1, or 2, or 3) valve-controlled is connectable. 2) defrosting device according to claim 1, characterized in that that in each case a check valve (17, 27, 37) on the outlet side of the tubing or the condenser (14, 24, 34) is provided. COPY j 3) Defrosting device according to claim 1 or 2, characterized in that the condensers (12, 22, 32) of the refrigeration systems can each be controlled via a pressostat (41). ^! 4) defrosting device according to one of claims 1 to 3, characterized in that the largest existing compressor (23) of a refrigerant circuit (2) is on the high-pressure side with the contacts or condensers (14, 34) of the evaporator (11, 31) of all further refrigerant circuits (1, 3) and a compressor (13) - one of the further refrigerant circuits (1) On the high pressure side with the tubing or the condenser (24) of the evaporator (21) of the first refrigerant circuit (2) is connectable. 5) defrosting device according to claim 4, characterized in that that the next smaller compressor (13) of the further refrigerant circuits on the high pressure side with the tubing or the condenser (24) of the evaporator (21) of the first refrigerant circuit (2) can be connected. copy '