DEVICE FOR FILLING VEHICLE AIR CONDITIONING SYSTEMS WITH COOLANT R744

Abstract

A device for filling vehicle air conditioning systems with refrigerant R744 comprises at least one storage tank for liquid refrigerant R744, actively connected by at least one pump station, a supply line and a return line to a filling system from which the refrigerant R744 is fed by an adapter into the vehicle air conditioning system. The refrigerant R744 is maintained in the liquid phase within the supply design. A temperature sensor and a valve circuit are arranged in the region between the supply line and the filling system, which control the flow of the refrigerant. Whenremoval of the refrigerant is interrupted, the refrigerant forcibly heated by the removal pause is returned and/or guided to the storage tank and the cold refrigerant is guided from the storage tank to the filling station. An adapter support in the support position can be tensioned by a sealing positive fit on a specific connection.

Claims

1. A device for filling vehicle climate systems with refrigerant R744, in which the device comprises at least one storage tank for liquid refrigerant R744, which is actively connected by means of at least one pump station, a supply line and a return line, to a filling system from which the refrigerant R744 is fed by means of an adapter into the vehicle climate system, wherein in the transitional region between the supply line and the filling system a temperature sensor (T) and a valve circuit are arranged, which control the refrigerant flow in accordance with each actual operating situation such, that when the removal of the refrigerant is interrupted, the refrigerant force ably heated by the removal pause is returned and/or guided to the storage tank and the cold refrigerant is guided from the storage tank to the filling station, in which the valve circuit and subsequently a return and/or cooling of the refrigerant is initiated by the filling system and in which an adapter support is designed such that the adapter in the support position thereof can be tensioned by means of a sealing positive fit on a specific connection (service port) such that a return and/or cooling of refrigerant takes place by means of a return line associated with the adapter support, in which the adapter support is controlled and subsequently the returning and/or cooling of the refrigerant is initiated by the filling system and the device triggers the return and/or cooling of refrigerant by means of the valve circuit and/or of adapter support only at certain time points in which the use-specific operating behaviour of the filling system is not taken into account.

2. The device according to claim 1, wherein the sealing form connection designed on the adapter support is configured like a vehicle valve at the connection for the adapter.

3. The device according to claim 1, wherein the return line is designed for discharging the heated refrigerant via a building roof.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0015] An exemplary embodiment of the invention is described below with reference FIG. 1.

DETAILED DESCRIPTION

[0016] The device shown in the FIG. 1 designed for an initial filling of vehicle climate systems with refrigerant R744. The device has a storage tank 1 for liquid refrigerant R744, which is in operative connection via a line 5 and a pump station 2 as well as via a supply line 6 and a return line 7 with a filling system 3. Starting out from the filling system 3, the refrigerant R744 is feds into an assembly of the vehicle climate system via an adapter 4.

[0017] Tanks 1 for liquid refrigerant R744 with a connected pump station 2 as well as ring lines and return lines required for this are known from prior art, so that these modules need not be explained in detail at this point.

[0018] However, it is essential in the present situation automatically regulate the temperature and the pressure of the refrigerant R744, to consider the removal profile, and to keep the enthalpy diagram corresponding to the medium in a largely optimum range. For example, a range of 5° Celsius to 18° Celsius and a printing position of 60 bar are mentioned here. If the refrigerant R744 can filled within these physical limits up to the filling opening into the vehicle climate system, filling without a complex real-time correction is possible with the aid of mass flow measurement technology.

[0019] This achieved by the supply system for the refrigerant R744 (hereinafter referred to as “medium”) in addition to the supply line 6 a return line 7. A temperature sensor T and a valve circuit 10 arranged at the transfer of the supply line 6 to the filling system 3. For example, at a media removal pause the temperature, the heated medium can flow back with the aid of the valve circuit 10 and cold medium conveyed to the filling system 3. The allocation of the valve circuit 10 to the filling system 3 is advantageous because the latter known or controlled by it. In this way, a return or cool down of medium can always be carried out in times in which the required operating behavior is not impaired.

[0020] The filling line within the filling system 3 up to the adapter outlet has to also monitored with regard to the medium temperature and the pressure position. In order to dispense with a return line within the filling system 3, the adapter tray advantageously be designed in such a way that the adapter 4 is tensioned in the storage position onto a special connection similar to that of the vehicle system. Thus, medium can discharge over the same filling path and colder medium can fed via the supply section and the filling system 3. In this case, as well, the control is advantageously to left to the filling system 3, since the removal regime is known to it or is controlled by itself. In this way, a media return or cooling can also carried out at such times that the required operating behavior is not impaired. The transport or return transport of the medium may e.g. via a line 8 to the roof of the building or a return line 9 to the storage tank 1.