DE202007013572U1 - Refrigerant collector for a refrigeration cycle with reversible operation - Google Patents

Abstract

Refrigerant collector for one Refrigeration circuit with reversible operation for Cool and heating consisting of a collecting tank with an inlet pipe and an outlet pipe, characterized in that inlet pipe and outlet pipe (2, 3) are formed similarly and depending on flow direction of the refrigerant can be used in the circuit both as inlet and outlet pipe are.

Description

The The invention relates to a refrigerant collector in conjunction with an air conditioner, that is for the Heating to heat pump operation switch over. The collector is part of a reversible air conditioning refrigeration kit, especially for air conditioners for rail vehicles, consisting of a collection container with input and output according to the preamble of claim 1.

In refrigeration systems for air conditioners, a refrigerant collector is usually placed after the condenser to compensate for the different refrigerant charge levels of the evaporator and condenser under varying operating conditions. Systems with sufficiently large storage volume of the condenser and little fluctuating refrigerant demand are designed without a collector. Refrigerant collectors for air conditioners are for example from the publications DE 43 14 917 C2 . DE 199 46 217 C1 and DE 10 2006 016 230 A1 known.

In For many climate applications, switching the process is so realized that you can use the air conditioner for winter operation as a heat pump can use. This switchover takes place either on the air side or refrigeration cycle side.

at air side switching is the supply air to be cooled in the summer over the Evaporator led and the condenser heat is to an outside air or water cycle. When switching to heating mode is the supply air to be heated or the heating water of the heating system on the Anlagenverflüssiger passed and the evaporator is traversed by the outside air, the as a heat source acts. The refrigeration cycle remains including his collector unchanged in function, d. H. the evaporator remains during cooling and heating evaporator and the liquefier stays cool and when heating condenser.

at Refrigeration circuit switching the air streams are via evaporator and liquefier unchanged continued to operate, but the refrigeration cycle is by means of 4/2-way valve or by means of four solenoid valves such switched over that of the condenser in heating mode to the evaporator and the evaporator in heating mode to the liquefier. For systems without collectors, it then requires an additional injector and check valves connected in parallel to the injection valves, so that each not in function injector at flow the evaporator can be bypassed in the opposite direction. For plants without a collector, the cycle is thus functional in both directions. at Collector systems are a duplication, as with injectors required by a second collector for the heat pump circuit after the Heat pump condenser, the Refrigeration circuit evaporator parallel to the collector of the refrigeration cycle is arranged and the respective non-functioning collector by kickback and solenoid valve is disconnected from the circuit.

The Need for this circuit results from the operating principle of the collector, the at the upper entry point liquid entering has, on the container wall or shortly thereafter ends and having an outlet tube, as Immersion tube from the bottom of the tank out to the upper part of the container There through the wall leads. The is required to operate at different operating conditions variable fill factor of the container acting as a collector good to be able to use almost empty collector.

The Arrangement of a second collector means an increased equipment Effort and also entails the operational uncertainty, that the shut-off devices of the inactive container close not very tight and thus uncontrollable refrigerant displacements can happen.

Therefore, another solution is known in which the collector in its original refrigeration cycle configuration can also be used for heating by switching input and output lines when switching from cooling to heating also using 4/2-way valve or four solenoid valves. In the publication DE 94 21 231 U1 Such a reversible air conditioning system for cooling and heating is described. This solution is also expensive and requires additional device installations.

The The object of the present invention is, therefore, the o.g. To improve air conditioning in such a way that when switching circuits from Cool for heating for Plants with required collector to a second collector or the said switching devices can be dispensed with.

According to the invention, this object is solved by the features of claim 1. Advantageous developments of the invention are contained in the accompanying claims. Accordingly, the present invention provides for a refrigeration system with a refrigerant collector after the condenser to make the collector so that it can be used unchanged in both circuit variants, without additional switching or bypass devices are required, it being suggested that the collector Both entry and exit side is made completely identical, which he when flowing through in both directions similar works as a collector.

Advantageous to the inlet pipe and the outlet pipe from the top Area of the tank shell as a dip tube almost to the bottom of the container guided. In this way, the coming from the condenser liquid refrigerant pour into the collector and him according to the operating conditions to the intended Fill the stand. The exit dip tube, in turn, can up the refrigerant supply in the container almost to the bottom of the container exploit, if the fluctuations of the operating condition require this. This function is the same in the opposite way flow direction given at circuit switching.

To Another variant of the invention provides that both the inlet and the outlet pipe at the bottom at the lowest point of the collector, whereby the same functions as with the similar dip tubes given are.

following the invention with reference to an embodiment and the accompanying drawings described in more detail.

in the Individuals show that

1 the sectional view of a refrigerant collector with similar dip tubes,

2 the sectional view of a refrigerant collector with similar Bodenein- and -austrittsrohren.

In the illustration after 1 are the dip tubes 2 and 3 from the top of the refrigerant collector 1 led almost to the bottom of the collector. The dip tubes 2 and 3 are identical in terms of length, diameter and shape and at two different locations on the circumference of the collection container 1 arranged at the same height (location). Both dip tubes can be used either as inlet or outlet pipe. The liquid level 4 can be between the maximum level and the level lying almost at the bottom and is at the bottom of the vertical position inlet opening of the dip tubes 2 respectively. 3 certainly.

The representation after 2 corresponds to the 1 with the difference that the inlet and outlet pipes 2 and 3 at the collecting tank 1 are used at the bottom.

Claims (5)

Refrigerant collector for a refrigeration cycle with reversible operation for cooling and heating consisting of a collecting container with an inlet tube and an outlet tube, characterized in that the inlet tube and outlet tube ( 2 . 3 ) are formed identically and depending on the flow direction of the refrigerant in the circuit can be used both as an inlet and outlet pipe. Refrigerant collector according to claim 1, characterized in that the tubes ( 2 . 3 ) With respect to position and shape, diameter and length are the same. Refrigerant collector according to claims 1 and 2, characterized in that the inlet and outlet pipes ( 2 . 3 ) than into the collecting container ( 1 ) projecting dip tubes are formed Refrigerant collector according to claims 1 and 2, characterized in that the inlet and outlet pipes ( 2 . 3 ) at the bottom of the collecting container ( 1 ) are arranged. Refrigerant collector according to one of the above claims, characterized in that the inlet and outlet pipes ( 2 . 3 ) in each case opposite or nearly opposite or at different locations on the circumference of the collecting container 1 are arranged at the same height.