Device for evacuating and charging a refrigerating system

Abstract: A device for evacuating and charging refrigerant in a refrigerant circuit (64) comprises a hand pump to evacuate the circuit, which pump shows a pump cylinder (10), in which a pump piston (12) is movable to and fro by a piston rod (16), on which a pump handle (14) in mounted. The circuit is charged with refrigerant from a container (18), which extends in the longitudinal direction of the pump cylinder (10) and is fastened to the cylinder.

Description: The invention refers to a device for evacuating and charging refrigerant in a refrigerant circuit comprising a pump to evacuate the circuit and a container with refrigerant which is conducted into the circuit by self pressure. Such a known device, which frequently is used when a refrigerating compressor in a domestic refrigerator is replaced, comprises an electrically operated pump, by which the refrigerant in the circuit is evacuated before the defective compressor is removed from the circuit. When the new compressor has been connected to the circuit, the circuit is evacuated once more by the pump. After that the circuit is refilled with refrigerant from the container. At the known device the container communicates with a glass tube, in which one can observe the level of the refrigerant in the container. Behind the glass tube there is a scale, om which one can see how many grams of refrigerant there is in the container. The container can hold refrigerant for charging about five refrigerant circuits. At the known device the container can be mounted on the pump. The known device is relatively expensive by the pump being electrically operated. It is furthermore cumbersome to handle thereby that the pump is built into a box, which shows a relatively small height but a relatively large extension in side direction, while on the other hand, in order that one shall get a good accuracy of reading on the scale, the container shows a relatively large extension in height direction but a relatively small extension in side direction. The object of the invention is to improve the known device so that it will be easier to handle, that it takes smaller place, that the accuracy of reading on the scale becomes good and that it becomes cheaper to produce. This object is obtained by the device according to the invention thereby that the pump is constituted by a hand pump showing a pump cylinder, in which a pump piston is arranged to be moved to and fro by a piston rod by means of a handle for manual pumping and that the container extends in the longitudinal direction of the pump cylinder and is fastened to the cylinder. An embodiment of a device according to the invention is described below in connection to the enclosed drawing, where Fig. 1 shows a side view of a pump with a container, parts of the container and the pump having been cut out so that an upper part, a middle part and a lower part of a pump cylinder are shown in a longitudinal sectional view, and Fig. 2 shows a sectional view according to the marking II-II in fig. 1. Referring to Fig. 1 numeral 10 designates a cylinder, in which a piston 12 is manually drivable to and fro by a handle 14, which is fastened to a rod 16, which connects the handle with the piston. A closed container in the shape of two tubes 18 is fastened to the cylinder 10 by holders 20. The tubes 18 communicate with each other and with a glass tube 22 via pipes 24. The container is filled with refrigerant through a valve 26. The level 28 of the refrigerant in the container is visible through the tube 22, which has a measuring scale 30 as background. The quantity of refrigerant in the container can be read on the scale 30 The device shows a tube 36, which is connected to a pump chamber 38 through a conduit 40, which is provided with a cut-off valve 42 and a nonreturn valve 44, the flow direction of which being indicated by the arrow 46. The pump chamber 38 shows a discharge tube 48, which is provided with a nonreturn valve 50, the flow direction of which being indicated by the arrow 52. The tube 48 is provided with a flexible bladder 54 for collecting refrigerant. The container 18 shows an outlet, which is connected to the tube 36 via a cut-off valve 56. The tube 40 is provided with a pressure gauge 58 displaying the pressure in the tube 40. The device is at the bottom provided with a support 60, into which the person who pumps with the handle 14 can put a foot to hold the pump against a basis when pumping. When e.g. a refrigerating compressor 62, which is part of a refrigerant circuit 64 of a domestic refrigerator, shall be replaced the following acting takes place: The tube 36 is connected to the circuit 64. The valve 56 is closed. The valve 42 is opened, at which the refrigerant first by self pressure will flow through the tubes 36 and 40, through the pump chamber 38 and through the tube 48 into the collecting bladder 54. When the pressure in the circuit 64 has reached atmospheric pressure, the circuit 64 is further evacuated by pumping with the handle 14 till a desired vacuum can be read on the gauge 58. The circuit 64, which now is emptied of refrigerant, can now be opened, after which the compressor is replaced with a new one and the circuit 64 is sealed, after which air which has come into the circuit is evacuated to a desired vacuum level by pumping with the pump. After that the valve 42 is closed and the valve 56 is opened so long, that a desired quantity of refrigerant by self pressure flows from the container into the circuit 64 through the tube 36. Then the tube 36 is removed from the circuit 64, which now is charged with new refrigerant.

Claims: Device for evacuating and charging refrigerant in a refrigerant circuit (64) comprising a pump to evacuate the circuit and a container (18) with refrigerant which is conducted into the circuit by self pressure, characterized in, that the pump is constituted by a hand pump showing a pump cylinder (10), in which a pump piston (12) is arranged to be moved to and fro by a piston rod (16) by means of a handle (14) for manual pumping and that the container (18) extends in the longitudinal direction of the pump cylinder (10) and is fastened to the cylinder. Device according to claim 1, characterized in , that the pump is of single-acting type with a pump chamber (38) located between the piston (12) and the bottom of the cylinder (10). Device according to claim 1 or 2, characterized in , that the pump at the bottom is provided with a support (60), into which the person who pumps with the handle can put a foot for holding the pump against a basis. Device according to any of the preceding claims, characterized in, that the container comprises two cylindrical tubes (18), which extend in parallel with each other and with a glass gauge (22) arranged between the tubes (18), the tubes (18) and the glass gauge (22) communicating with each other.

Inventors: SUNDMAN KURT, SUNDMAN, KURT
Applicants: ELECTROLUX AB, AKTIEBOLAGET ELECTROLUX
Application year: 1993
Main classification: F25B45
IPC codes: F25B45